A coolant leak detection device, a battery pack, and an electrical device.

Abstract

This utility model relates to the field of battery pack technology, and discloses a coolant leakage detection device, a battery pack, and an electrical device. By utilizing the low-voltage detection circuit and two detection lines of the BMS within the battery pack, it can accurately determine that the insulation failure is caused by coolant leakage, avoiding situations where high-voltage leakage from other parts is the cause, thus facilitating fault diagnosis. Furthermore, because the voltage of the low-voltage detection circuit is relatively low, the breakdown voltage of the air gap is relatively high. Even with a small electrical gap, it is not easily broken down under normal operating voltage. Therefore, the second ends of the two mutually insulated detection lines can be positioned close to the bottom of the battery pack via a fixing component, achieving more effective coolant leakage detection and improving detection sensitivity and accuracy. In addition, it has the advantages of real-time detection and rapid response, and its structure is relatively simple and easy to install.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a coolant leakage detection device, a battery pack, and an electrical device. Background Technology

[0002] To meet the operational demands of vehicles under various complex conditions and the urgent need for fast charging, the charging and discharging power of lithium-ion battery packs is often set at a high level. While this design improves performance, it inevitably leads to a sharp rise in cell temperature, thereby increasing the risk of thermal runaway. To effectively manage cell temperature and ensure that it does not exceed safety thresholds during high-rate charging and discharging, the commonly used technical solution in the industry is to integrate a liquid cooling plate at the bottom of the battery pack housing. This utilizes the circulation of coolant to effectively cool the cells, thereby significantly improving system safety.

[0003] The liquid cooling plate is designed with inlets and outlets to ensure smooth flow of coolant within it. However, the piping connected to the inlet and outlet poses a potential risk of leakage. If coolant leaks from the connection, it can not only seep into the high-pressure chamber but also cause a loss of insulation, and in severe cases, even lead to catastrophic consequences such as fire or explosion.

[0004] To address the issues of leakage at liquid cooling pipe connections and water ingress into the high-pressure chamber, existing technologies primarily rely on detecting insulation failure caused by water ingress between the copper busbar and the high-pressure chamber. Specifically, the method involves simulating the battery pack's state at different tilt angles to determine the lowest point, and then exposing a copper busbar from the main circuit at this lowest point. When a leak occurs in the inlet / outlet connection of the liquid cooling plate, water comes into contact with the exposed copper busbar at the lowest point, causing insulation failure in the main circuit. The system will immediately issue an alarm and cut off the high-voltage power supply.

[0005] However, this water ingress detection method, which relies on water contact with copper busbars leading to insulation failure of the entire package, has the following significant drawbacks:

[0006] (1) The judgment is not clear enough, and it is difficult to distinguish in a timely and accurate manner whether the insulation failure is caused by water ingress or high voltage leakage in other parts of the battery pack, which makes troubleshooting difficult.

[0007] (2) A lot of simulation work is needed to determine the lowest point of the battery pack. At the same time, the electrical clearance requirements between the copper busbar and the box must also be considered. This limits the selection of the copper busbar location, resulting in a large distance between the copper busbar and the bottom of the box, which makes it impossible to effectively detect water ingress and reduces the sensitivity and accuracy of the detection.

[0008] Given the aforementioned drawbacks, it is particularly important to improve existing technologies.

[0009] The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0010] This invention provides a coolant leakage detection device, a battery pack, and an electrical device to solve the problems existing in the prior art.

[0011] To achieve the above objectives, this utility model provides the following technical solution:

[0012] In a first aspect, this utility model provides a coolant leakage detection device for use in a battery pack. The device includes two detection lines, a fixing component, and a battery management system (BMS) installed inside the battery pack. The BMS is equipped with a low-voltage detection circuit.

[0013] The first end of each of the detection lines is connected to the low-voltage detection circuit, and the second end is set inside the battery pack near the bottom of the housing by the fixing component.

[0014] The second ends of the two detection lines are insulated from each other and can be connected to each other through the leaking coolant in the event of a coolant leak, so as to conduct the low-pressure detection circuit.

[0015] Furthermore, in the coolant leakage detection device, the low-pressure detection circuit includes a low-pressure power supply module, a voltage divider resistor, and a voltage monitoring point;

[0016] The low-voltage power supply module is connected in series with the voltage divider resistor and then connected to the first end of one of the detection lines;

[0017] The first end of the other detection line is connected to the voltage monitoring point.

[0018] Furthermore, in the coolant leakage detection device, the detection line is a hard wire.

[0019] Furthermore, in the coolant leakage detection device, the fixing component includes a bracket and a fixing plug;

[0020] The fixing plug has insertion holes on its opposite sides, one of which can be used to insert the second end of one of the detection lines, and the other can be used to insert the second end of the other detection line.

[0021] The fixing plug is mounted on the bracket, snapped together with the bracket, and installed at the bottom of the battery pack housing via the bracket.

[0022] Furthermore, in the coolant leakage detection device, the fixing plug is provided with a buckle, and the bracket is provided with a snap-in hole that cooperates with the buckle.

[0023] Furthermore, in the coolant leakage detection device, the fixing plug has an opening;

[0024] The opening is located between the second ends of the two detection lines and is positioned near the bottom of the battery pack housing.

[0025] After the second ends of the two detection lines are inserted into the plug hole, they do not extend into the opening.

[0026] Furthermore, in the coolant leakage detection device, the bracket is L-shaped and includes a fixing part and a supporting part;

[0027] The supporting part is arranged parallel to the bottom of the battery pack housing and perpendicular to the fixing part;

[0028] The fixing part has a mounting hole for installing the bracket inside the battery pack;

[0029] The support portion is provided with a guide channel that can guide leaked coolant to the opening.

[0030] Furthermore, in the coolant leakage detection device, the insertion hole is provided with an elastic snap-fit ​​component that can abut against the second end of the detection line to prevent it from falling off when the second end of the detection line is inserted into the insertion hole;

[0031] The snap-fit ​​assembly is provided with a guide portion to facilitate the insertion of the second end of the detection line.

[0032] Secondly, the present invention provides a battery pack, the battery pack including the coolant leakage detection device as provided in the first aspect above.

[0033] Thirdly, this utility model provides an electrical device, including the battery pack provided in the second aspect above.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] This utility model provides a coolant leak detection device, battery pack, and electrical device. Utilizing the low-voltage detection circuit and two detection lines of the BMS within the battery pack, it can accurately determine that the insulation failure is caused by coolant leakage, avoiding situations where high-voltage leakage occurs in other parts, thus facilitating troubleshooting. Furthermore, because the voltage of the low-voltage detection circuit is relatively low, the breakdown voltage of the air gap is relatively high. Even with a small electrical gap, it is not easily broken down under normal operating voltage. Therefore, the insulated second ends of the two detection lines can be positioned close to the bottom of the battery pack via a fixing component, achieving more effective coolant leak detection and improving detection sensitivity and accuracy. In addition, it has the advantages of real-time detection and rapid response, and its structure is relatively simple and easy to install.

[0036] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a coolant leakage detection device (BMS and low-pressure detection circuit are not shown together) provided in Embodiment 1 of this utility model;

[0039] Figure 2 This is an installation diagram of a coolant leakage detection device (BMS and low-pressure detection circuit are not shown together) provided in Embodiment 1 of this utility model;

[0040] Figure 3 This is a schematic diagram of the low-voltage detection circuit provided in Embodiment 1 of this utility model;

[0041] Figure 4 This is a schematic diagram of the structure of the fixing plug provided in Embodiment 1 of this utility model;

[0042] Figure 5 This is a schematic diagram of the structure of the bracket provided in Embodiment 1 of this utility model;

[0043] Figure 6This is a structural schematic diagram of the fixing plug and detection line provided in Embodiment 1 of this utility model.

[0044] Figure label:

[0045] Detection line 1, fixing component 2, BMS 3, low voltage detection circuit 4;

[0046] 21. Bracket; 22. Fixing plug; 23. Insertion hole; 24. Inverted buckle; 25. Snap-in hole; 26. Opening; 27. Flexible snap-fit ​​component; 28. Guide part.

[0047] Fixing part 211, bearing part 212, mounting hole 213, guide groove 214;

[0048] Low-voltage power supply module 41, voltage divider resistor 42, voltage monitoring point 43. Detailed Implementation

[0049] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0050] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0051] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0052] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0053] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order between these entities or operations.

[0054] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0055] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0056] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0057] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] Example 1

[0059] Please refer to Figure 1-2 This utility model provides a coolant leakage detection device for use in a battery pack. The device includes two detection lines 1, a fixing component 2, and a battery management system (BMS) 3 installed inside the battery pack. The BMS 3 is equipped with a low-voltage detection circuit 4.

[0060] Specifically, one end (i.e., the first end) of each detection line 1 is electrically connected to the low-voltage detection circuit 4, while the other end (i.e., the second end) is located inside the battery pack, adjacent to the bottom of the casing, via a fixing component 2. It is worth noting that the second ends of these two detection lines 1 are physically designed to ensure mutual insulation, but in the special case of coolant leakage, they can contact each other through the leaking coolant and establish an electrical connection, thereby activating the low-voltage detection circuit 4.

[0061] It should be noted that the significant advantage of this embodiment lies in its ingenious utilization of the cooperation mechanism between the low-voltage detection circuit 4 of the BMS 3 inside the battery pack and the two detection lines 1. This design not only accurately identifies insulation failure caused by coolant leakage, effectively eliminating other possible high-voltage leakage interference factors, but also greatly improves the accuracy and efficiency of fault diagnosis. Moreover, thanks to the relatively low voltage level of the low-voltage detection circuit 4, this characteristic increases the breakdown voltage required for the air gap, ensuring that even in situations with narrow electrical clearances, the circuit remains unbroken within the normal operating voltage range. Therefore, it is possible to position the mutually insulated second ends of the two detection lines 1 inside the battery pack near the bottom of the housing using the fixing component 2, which greatly enhances the sensitivity and accuracy of coolant leakage detection.

[0062] In addition, this device demonstrates real-time monitoring and rapid response capabilities. Its simple and clear structural design facilitates installation and maintenance, providing strong technical support for the safe operation of the battery pack.

[0063] Please refer to Figure 3 In one specific implementation described in this embodiment, the low-voltage detection circuit 4 mainly comprises three core components: a low-voltage power supply module 41, a voltage divider resistor 42, and a voltage monitoring point 43.

[0064] Specifically, the low-voltage power supply module 41 serves as the power source for the circuit. It is closely connected in series with the voltage divider resistor 42 and together they establish an electrical connection with the first terminal of one of the detection lines 1. This design aims to ensure that the circuit receives a stable and suitable voltage supply, laying a solid foundation for subsequent testing work.

[0065] Meanwhile, the first end of another detection line 1 is directly connected to voltage monitoring point 43. As a key node in the circuit, voltage monitoring point 43 bears the important responsibility of real-time monitoring of voltage changes. When the detection line becomes conductive due to coolant leakage, voltage monitoring point 43 can quickly detect this change and feed back the relevant signal to BMS 3, thereby triggering corresponding alarms or protection measures.

[0066] In summary, this embodiment, through its meticulously designed low-voltage detection circuit 4, not only achieves accurate detection of coolant leakage but also ensures the stability and reliability of the circuit, providing a strong guarantee for the safe operation of the battery pack.

[0067] In the specific implementation details described in this embodiment, particular emphasis is placed on the material selection of the detection line 1, namely, the use of a hard wire design. This choice is not arbitrary, but based on multiple considerations.

[0068] Compared to flexible wires or other materials, rigid wires possess higher rigidity and stability, allowing them to maintain a more stable shape within the battery pack and resist deformation or displacement due to external factors. Crucially, this characteristic ensures a relatively constant and suitable gap between the rigid wire and the bottom of the battery pack housing. This gap is vital, preventing short circuits that could occur if the detection wire 1 directly contacts the bottom of the housing, and ensuring that in the event of coolant leakage, the leaking fluid can smoothly reach the detection wire 1, triggering the response mechanism of the low-voltage detection circuit 4.

[0069] Furthermore, the solid wire design facilitates installation and maintenance because its shape is more stable and it can be more easily and accurately placed in the predetermined position using the fixing component 2, without the need for frequent adjustments or calibrations. This not only improves installation efficiency but also reduces the difficulty and cost of later maintenance.

[0070] In summary, by using a hard wire as the material for detection line 1, this embodiment not only enhances the stability and reliability of the circuit, but also provides a more accurate and effective means for detecting coolant leaks.

[0071] Please refer to this again. Figure 1 and in conjunction with references Figure 4-5 This embodiment further discloses a specific and practical design scheme for the fixing component 2. The fixing component 2 mainly includes two core parts in structure: a bracket 21 and a fixing plug 22. The two work together to achieve a stable installation of the second end of the detection line 1.

[0072] Specifically, the fixing plug 22, as a key connector, is ingeniously designed. On opposite sides along its length L, two cleverly placed insertion holes 23 serve distinct functions: one hole 23 is specifically for inserting and securing the second end of one of the detection lines 1, while the other hole 23 is for inserting and securing the second end of the other detection line 1. This design not only ensures that the detection lines can be accurately inserted and secured in their designated positions but also effectively prevents circuit malfunctions or safety hazards caused by improper insertion.

[0073] Even more ingeniously, the fixing plug 22 is not isolated, but cleverly positioned on the bracket 21. The bracket 21, serving as the carrier and support structure for the fixing plug 22, is tightly connected to it via a snap-fit ​​connection, forming a stable whole. This design not only enhances the structural strength of the fixing component 2, but also makes the entire assembly more convenient and efficient during installation.

[0074] Ultimately, through the ingenious design of bracket 21, the entire fixing assembly 2 is securely installed at the bottom of the battery pack housing. This location not only ensures that the detection line 1 can be as close as possible to potential coolant leak points, thereby improving the sensitivity and accuracy of the detection, but also effectively avoids interference or damage to other components inside the battery pack that may be caused by improper installation.

[0075] Please refer to this again. Figure 4-5 This embodiment further elaborates on a unique connection mechanism between the fixing plug 22 and the bracket 21. In this embodiment, the fixing plug 22 is cleverly designed with an inverted buckle 24 as a structural feature, while the bracket 21 is correspondingly equipped with a snap-in hole 25 that mates with the inverted buckle 24.

[0076] Specifically, the inverted clip 24, as a special structure on the fixing plug 22, is carefully designed in shape and size to ensure a tight and secure fit with the snap-in hole 25 on the bracket 21. When the fixing plug 22 is installed on the bracket 21, the inverted clip 24 naturally snaps into the snap-in hole 25, forming a firm snap-fit ​​connection. This connection method is not only simple and easy to implement, but also effectively resists external vibration or impact, ensuring that the connection between the fixing plug 22 and the bracket 21 remains stable and reliable.

[0077] More importantly, this snap-fit ​​connection mechanism facilitates installation and disassembly. When it is necessary to install or replace the detection line 1 or the fixing plug 22, the operator only needs to apply a certain amount of external force to make the buckle 24 disengage from the snap-in hole 25, thereby achieving quick disassembly. Similarly, when installing the fixing plug 22, simply align it with the snap-in hole 25 and press gently to make the buckle 24 snap into place smoothly, completing the installation process.

[0078] In summary, this embodiment, by introducing a unique snap-fit ​​connection mechanism of the inverted buckle 24 and the snap-fit ​​hole 25, not only achieves a stable connection between the fixing plug 22 and the bracket 21, but also greatly improves the convenience of installation and disassembly, bringing significant optimization and improvement to the overall design and use of the coolant leakage detection device.

[0079] Please refer to this again. Figure 2 and 4 In one embodiment of this invention, particular focus is placed on the structural characteristics of the fixing plug 22. In this embodiment, the fixing plug 22 is cleverly designed with an opening 26, a design that plays a crucial role in coolant leak detection.

[0080] Specifically, the opening 26 is carefully positioned precisely in the area between the second ends of the two detection lines 1, and adjacent to the bottom of the battery pack housing. This arrangement ensures that if coolant leaks for any reason, the leaking coolant will first come into contact with the bracket 21 and then flow into the opening 26 of the fixing plug 22.

[0081] More importantly, when coolant rushes into opening 26 and covers the second ends of the two detection lines 1, these two detection lines, which were originally insulated, will instantly become electrically connected due to the presence of coolant as a conductive medium. This change immediately triggers the response mechanism of the low-voltage detection circuit 4, and the circuit, which was originally in an open circuit state, instantly becomes a closed circuit, thereby sending a coolant leakage alarm signal to BMS 3.

[0082] This design not only significantly improves the sensitivity and accuracy of coolant leak detection, but also ensures that an alarm can be triggered quickly when a leak occurs, gaining valuable time for timely response. Furthermore, the placement of opening 26 close to the bottom of the enclosure allows the detection line to be as close as possible to potential leak sources, further enhancing the reliability of the detection.

[0083] In summary, this embodiment, through the innovative design of introducing the opening 26 on the fixing plug 22, not only optimizes the coolant leakage detection mechanism but also significantly improves the safety performance of the battery pack.

[0084] In one embodiment of this invention, when the second ends of the two detection lines 1 are respectively inserted and fixed into the corresponding insertion holes 23, they are both flush with the end face of the opening 26 in the length direction. That is to say, the second ends of the two detection lines 1 do not extend into the opening 26. At the same time, the length direction of the opening 26 is the same as the length direction L of the fixed plug 22. In terms of size, the length a of the opening 26 is 1mm-10mm, which means that the distance between the second ends of the two detection lines 1 is also 1mm-10mm, thus avoiding accidental contact between the two detection elements 1.

[0085] Furthermore, the side of the fixing plug 22 facing the bottom of the battery pack housing (such as...) Figure 4 The side indicated by b) is 2mm-5mm from the bottom of the battery pack housing. In other words, the end of opening 26 closest to the bottom of the battery pack housing in its height direction also maintains a 2mm-5mm gap from the bottom of the battery pack housing. Furthermore, the height direction of opening 26 is the same as the height direction H of the fixing plug 22. This carefully designed size and layout aims to ensure optimal fit between the detection line 1 and opening 26, while also taking into account the rational utilization of the internal space of the battery pack and the stability of the overall structure. This provides an accurate and reliable physical basis for coolant leak detection, ensuring the safe operation and performance of the battery pack.

[0086] Please refer to this again. Figure 2 and 5 This embodiment introduces in detail an innovative bracket 21 design that not only ensures the stability and reliability of the fixing component 2, but also further improves the efficiency and accuracy of coolant leak detection.

[0087] Specifically, the bracket 21 is cleverly designed into an L-shaped structure. This shape is not accidental, but is based on the layout of the internal space of the battery pack and the installation requirements of the detection line 1. The L-shaped bracket 21 consists of two parts: a fixing part 211 and a supporting part 212. They are arranged vertically to each other and together form a stable support structure.

[0088] The fixing part 211 serves as the foundation of the bracket 21, and its main function is to ensure that the bracket 21 can be securely installed inside the battery pack. To this end, mounting holes 213 are specially provided on the fixing part 211. The design of these holes fully considers the installation environment and requirements inside the battery pack, so that the bracket 21 can be easily fixed in the predetermined position by bolts or other fasteners.

[0089] The support unit 212 plays a more important role. It not only maintains a parallel configuration with the bottom of the battery pack housing, providing a stable platform for the insertion and fixation of the detection line 1, but more importantly, it also features a cleverly designed flow guide trough 214. This design aims to quickly guide leaking coolant towards the opening 26, ensuring that the detection line 1 can promptly detect the leak and trigger an alarm. The shape and dimensions of the flow guide trough 214 have been carefully calculated and optimized to ensure smooth coolant flow along it and reach the vicinity of the opening 26 in the shortest possible time. For example, the flow guide trough 214 is formed by an inward indentation from the surface of the support unit 212, and the depth of the flow guide trough 214 gradually increases from the end furthest from the opening 26 to the end closer to the opening 26, forming a sloping gradient. This gradient helps the coolant flow more smoothly towards the opening 26 under its own gravity, accelerating the coolant flow rate and further improving the timeliness of coolant leak detection.

[0090] This innovative design not only improves the sensitivity and accuracy of coolant leak detection but also effectively reduces potential safety risks caused by leaks. Through the clever layout of the L-shaped bracket 21 and the introduction of the guide channel 214, this embodiment significantly enhances the overall performance of the coolant leak detection device.

[0091] In summary, this embodiment, through the introduction of the unique design of the L-shaped bracket 21 and the guide channel 214, not only ensures the stability and reliability of the fixing component 2, but also further improves the efficiency and accuracy of coolant leakage detection, providing a strong guarantee for the safe operation of the battery pack.

[0092] Please refer to Figure 6 and in conjunction with references Figure 4 This embodiment further introduces an innovative internal structure design for the plug hole 23, particularly regarding the introduction of the elastic snap-fit ​​component 27 and its functional characteristics.

[0093] In this embodiment, the insertion hole 23 is given a more complex internal structure, in which an elastic snap-fit ​​component 27 is provided. This component is designed to provide a reliable abutment force when the second end of the detection line 1 is inserted into the insertion hole 23, so as to prevent the detection line 1 from accidentally coming out due to vibration or external force during subsequent use.

[0094] The structural design of the elastic snap-fit ​​assembly 27 fully considers practicality and convenience. It is made of a material with a certain degree of elasticity, or uses a spring combined with a snap-fit ​​block, to ensure that appropriate deformation occurs when the detection line is inserted, thereby tightly wrapping the second end of the detection line 1. At the same time, when the second end of the detection line 1 is inserted, the elastic snap-fit ​​assembly 27 can generate sufficient abutment force due to the elastic restoring force to maintain a stable connection of the detection line 1.

[0095] Even more thoughtfully, to facilitate the insertion of the detection line 1, the elastic snap-fit ​​assembly 27 is also designed with a guide part 28. This guide part 28 is usually shaped as a slope or other easy-to-guide shape. Its main function is to help the second end of the detection line 1 find the correct position more smoothly during the insertion process and overcome the initial resistance of the elastic snap-fit ​​assembly 27 until it is fully inserted and fixed.

[0096] The design of the guide section 28 not only simplifies the insertion operation but also reduces the risk of damage due to improper operation or misinsertion. Furthermore, due to the elastic properties of the resilient snap-fit ​​component 27, it can adapt to detection lines 1 of different sizes and shapes, thus providing broader compatibility.

[0097] In summary, by introducing the elastic snap-fit ​​component 27 and its guide portion 28, this embodiment not only significantly improves the stability and safety of the detection line 1 within the insertion hole 23, but also provides users with a more convenient and reliable insertion experience.

[0098] Although this application uses terms such as "detection line" and "battery pack" frequently, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

[0099] This utility model provides a coolant leak detection device that utilizes the low-voltage detection circuit and two detection lines of the BMS within the battery pack. This allows for accurate identification of insulation failure caused by coolant leakage, preventing situations where high-voltage leakage from other parts is the cause, thus facilitating troubleshooting. Furthermore, the relatively low voltage of the low-voltage detection circuit results in a relatively high breakdown voltage for the air gap. Even with a small electrical gap, it is not easily broken down under normal operating voltage. Therefore, the insulated second ends of the two detection lines can be positioned close to the bottom of the battery pack via a fixing assembly, achieving more effective coolant leak detection and improving detection sensitivity and accuracy. Additionally, it offers advantages such as real-time detection and rapid response, and its simple structure facilitates installation.

[0100] Example 2

[0101] This utility model provides a battery pack in embodiment two, which includes a coolant leakage detection device as provided in embodiment one above.

[0102] This innovative design aims to integrate coolant leak detection directly into the battery pack system, thereby enabling real-time monitoring and protection of the coolant status inside the battery pack.

[0103] Specifically, the battery pack in this embodiment retains all the key components of a traditional battery pack in terms of structure, such as battery cells, modules, and thermal management systems. However, it cleverly incorporates the coolant leakage detection device described in Embodiment 1. This device is precisely installed in an appropriate location within the battery pack, typically adjacent to a critical area of ​​the cooling system, to ensure accurate detection of any potential coolant leakage events.

[0104] The integration of the coolant leak detection device into the battery pack is not a simple physical addition, but rather a result of careful design and optimization. For example, the inherent components within the battery pack are utilized effectively, and the structure and layout of the mounting components are carefully adjusted to accommodate the space constraints and heat dissipation requirements within the battery pack.

[0105] Furthermore, this embodiment also considers the communication and data transmission between the coolant leak detection device and the BMS. Through built-in sensors and a signal processor, the coolant leak detection device can monitor the coolant status in real time and immediately send an alarm signal to the BMS upon detecting a leak. The BMS can then quickly respond to this signal and take necessary protective measures, such as cutting off power and activating the emergency cooling system, to prevent damage to the battery pack or safety accidents caused by coolant leakage.

[0106] In summary, this embodiment provides a battery pack that integrates a coolant leakage detection device, which not only enhances the safety performance of the battery pack but also improves its reliability and durability. This innovative design will bring more comprehensive and effective protection to battery pack systems in applications such as electric vehicles.

[0107] Example 3

[0108] This utility model provides an electrical device in embodiment three, which includes a battery pack as described in embodiment two above.

[0109] The electrical device can be an electric vehicle, a mobile phone, a computer, a laptop, or an electric toy, etc. This embodiment will use an electric vehicle as an example for explanation.

[0110] This embodiment aims to directly apply advanced coolant leak detection technology to the power system of electric vehicles, thereby achieving real-time monitoring and efficient management of the battery pack coolant status, and further improving the safety performance and operational reliability of electric vehicles.

[0111] In this embodiment, the core of the electric vehicle's power system, namely the battery pack, adopts the advanced design described in Embodiment 2, which integrates a coolant leakage detection device. This design enables the electric vehicle to monitor the state of the coolant inside the battery pack in real time. Once a leakage event is detected, an alarm is immediately triggered and necessary protective measures are taken, such as cutting off the power supply and activating the emergency cooling system, to prevent damage to the battery pack or more serious safety accidents.

[0112] Furthermore, the tight integration between the coolant leak detection device and the BMS significantly improves the overall performance of electric vehicles. Based on real-time data provided by the coolant leak detection device, the BMS can perform more precise temperature control and thermal management of the battery pack, thereby extending battery life and improving the electric vehicle's range and energy efficiency.

[0113] More importantly, this innovative design also brings a safer and more reliable driving experience to electric vehicle users. By monitoring and providing early warnings of potential coolant leaks in real time, electric vehicles can take preventative measures before problems occur, effectively avoiding vehicle malfunctions or safety accidents caused by coolant leaks, and providing strong protection for users' safe travel.

[0114] In summary, this embodiment provides an electrical device integrating the battery pack described in Embodiment 2, which not only improves the safety performance and operational reliability of electrical devices such as electric vehicles, but also brings users a more convenient and efficient driving experience. This innovative design will inject new vitality into the development of related industries and drive related technologies forward.

[0115] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A coolant leakage detection device, applied to a battery pack, characterized in that, The device includes two detection lines (1), a fixing component (2), and a battery management system (BMS) (3) installed in the battery pack. The BMS (3) is equipped with a low-voltage detection circuit (4). The first end of each of the detection lines (1) is connected to the low-voltage detection circuit (4), and the second end is set inside the battery pack near the bottom of the housing via the fixing component (2); The second ends of the two detection lines (1) are insulated from each other and can be connected to each other through the leaking coolant in case of coolant leakage, so as to conduct the low-pressure detection circuit (4).

2. The coolant leakage detection device according to claim 1, characterized in that, The low-voltage detection circuit (4) includes a low-voltage power supply module (41), a voltage divider resistor (42), and a voltage monitoring point (43). The low-voltage power supply module (41) is connected in series with the voltage divider resistor (42) and then connected to the first end of one of the detection lines (1); The first end of the other detection line (1) is connected to the voltage monitoring point (43).

3. The coolant leakage detection device according to claim 1, characterized in that, The detection line (1) is a hard line.

4. The coolant leakage detection device according to claim 1, characterized in that, The fixing component (2) includes a bracket (21) and a fixing plug (22); The fixing plug (22) has insertion holes (23) on its opposite sides, one of the insertion holes (23) is for inserting the second end of one of the detection lines (1), and the other insertion hole (23) is for inserting the second end of the other detection line (1). The fixing plug (22) is disposed on the bracket (21), is snapped to the bracket (21), and is installed at the bottom of the battery pack housing via the bracket (21).

5. The coolant leakage detection device according to claim 4, characterized in that, The fixing plug (22) is provided with a buckle (24), and the bracket (21) is provided with a snap hole (25) that cooperates with the buckle (24).

6. The coolant leakage detection device according to claim 4, characterized in that, The fixing plug (22) has an opening (26); The opening (26) is located between the second ends of the two detection lines (1) and is set near the bottom of the battery pack housing; After the second ends of the two detection lines (1) are inserted into the plug hole (23), neither of them extends into the opening (26).

7. The coolant leakage detection device according to claim 6, characterized in that, The bracket (21) is L-shaped and includes a fixing part (211) and a supporting part (212). The supporting part (212) is arranged parallel to the bottom of the battery pack housing and perpendicular to the fixing part (211); The fixing part (211) has a mounting hole (213) for mounting the bracket (21) inside the battery pack. The support part (212) is provided with a guide channel (214) that can guide the leaked coolant to the opening (26).

8. The coolant leakage detection device according to claim 4, characterized in that, The insertion hole (23) is provided with an elastic snap-fit ​​component (27) that can abut against the second end of the detection line (1) to prevent it from falling off when the second end of the detection line (1) is inserted into the insertion hole. The snap-fit ​​assembly (27) is provided with a guide (28) to facilitate the insertion of the second end of the detection line (1).

9. A battery pack, characterized in that, The battery pack includes a coolant leak detection device as described in any one of claims 1-8.

10. An electrical device, characterized in that, Includes the battery pack as described in claim 9.

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