Battery pack tray, battery pack, electrical equipment, and leakage detection method and system

Abstract

The embodiments of the present application provide a battery pack tray, a battery pack, an electrical device, and a leakage detection method and system, which relate to the field of battery pack technology. The battery pack tray includes a tray body, a signal transmitter, and a signal receiver. The tray body has a receiving cavity and an opening, and the opening is connected to the receiving cavity. The signal receiver and the signal transmitter are spaced apart in the receiving cavity, and the signal receiver and the signal transmitter are used to be electrically connected to the controller. The signal transmitter is configured to send an optical signal toward the signal receiver, and at least part of the optical signal intersects with the depth direction of the receiving cavity. The signal receiver is configured to receive the optical signal and convert it into an electrical signal and send it to the controller, so that the controller can determine whether there is a leak at the opening. According to the battery pack tray provided in the embodiment of the present application, fewer monitoring components are arranged in a limited space, which can accurately and effectively monitor leakage in the package, thereby improving the safety of the battery pack.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack tray, a battery pack, an electrical device, and a leakage detection method and system. Background Art

[0002] Currently, battery packs, as the power core of new energy vehicles and energy storage devices, are subject to increasingly stringent safety and reliability requirements. For example, new energy vehicles operate under complex conditions, and water seepage into the battery packs used in them can lead to serious consequences such as short circuits, thermal runaway, battery leakage, and casing corrosion. Therefore, battery packs must have strong resistance to high-pressure water shock.

[0003] Because battery packs are primarily used to accommodate more batteries to ensure battery life, additional space is very limited. Related technologies utilize the narrow space within a battery pack to arrange components such as a camera, light source, and test strips. The technique uses image recognition to detect color changes in the test strips at the leaking location, extracting features to determine if a leak exists.

[0004] However, due to the limited space inside the battery pack, it is difficult to accurately and effectively monitor leakage under the premise of limited space, which affects the safety of the battery pack. Summary of the Invention

[0005] Based on this, the present application provides a battery pack tray, battery pack, electrical equipment, and leakage detection method and system to solve the problem that it is difficult to accurately and effectively monitor leakage in existing battery packs due to limited space.

[0006] In a first aspect, the present application provides a battery pack tray, comprising:

[0007] The tray body has a receiving cavity and an opening, and the opening is connected to the receiving cavity;

[0008] signal transmitter;

[0009] A signal receiver, the signal receiver and the signal transmitter are spaced apart and arranged in the accommodating cavity, and the signal receiver and the signal transmitter are used to be electrically connected to the controller;

[0010] The signal transmitter is configured to send an optical signal toward the signal receiver, and at least part of the optical signal intersects with the depth direction of the accommodating cavity; the signal receiver is configured to receive the optical signal and convert it into an electrical signal and send it to the controller so that the controller can determine whether there is leakage at the opening.

[0011] In a possible implementation, the signal transmitter is a parallel light transmitter, and the parallel light transmitter is configured to transmit a plurality of parallel light beams toward the signal receiver;

[0012] At least part of the light beam intersects with the depth direction of the accommodating cavity and is close to the edge of the opening.

[0013] In a possible implementation, the multiple light beams sent by the parallel light transmitter are arranged at intervals along a direction intersecting the depth direction of the accommodating cavity and the transmission direction of the light beams.

[0014] In a possible implementation, a transmission direction of at least a portion of the light beam sent by the parallel light transmitter is perpendicular to a depth direction of the accommodating cavity.

[0015] In a possible implementation, the light beam sent by the parallel light transmitter is located in the accommodating cavity.

[0016] In a possible implementation manner, the signal receiver and the signal transmitter are arranged opposite to each other.

[0017] In a possible implementation, the tray body has at least one mounting portion, which is located in the accommodating cavity and close to the edge of the opening, and the signal receiver and / or signal transmitter is connected to the mounting portion.

[0018] In a possible implementation, the tray body includes a frame and a bottom plate connected to one side of the frame, the opening is located on a side of the frame away from the bottom plate, and the mounting portion is located on a side of the frame facing the accommodating cavity.

[0019] In a possible implementation, the frame is formed by a plurality of side beams connected in sequence, and the signal receiver and the signal transmitter are connected to the same side beam.

[0020] In a second aspect, the present application also provides a battery pack, comprising any one of the battery pack trays provided in the first aspect.

[0021] In a third aspect, the present application also provides an electrical device, comprising the battery pack provided in the second aspect.

[0022] In a fourth aspect, the present application further provides a battery pack leakage detection method, comprising:

[0023] Sending an optical signal toward a signal receiver through a signal transmitter, wherein at least a portion of the optical signal intersects with a depth direction of the receiving cavity of the tray body;

[0024] The optical signal is received by the signal receiver and converted into an electrical signal and sent to the controller;

[0025] The controller receives the electrical signal and compares it with the signal threshold. If the electrical signal exceeds the signal threshold, it is determined to be a leakage fault.

[0026] In a possible implementation, the electrical signal is a current signal.

[0027] In a possible implementation, the signal threshold is a maximum value of a change in the current signal within a preset time period when the battery pack is vibrating and has no leakage.

[0028] In a fifth aspect, the present application further provides a battery pack leakage detection system, comprising a controller and the battery pack provided in the second aspect, wherein the controller is electrically connected to a signal transmitter and a signal receiver respectively;

[0029] The controller is configured to receive the electrical signal and compare it with a signal threshold, and determine that it is a leakage fault if the electrical signal exceeds the signal threshold.

[0030] The present application provides a battery pack tray, battery pack, electrical equipment, and leakage detection method and system. The battery pack tray includes a tray body, a signal transmitter, and a signal receiver. By providing a receiving cavity and an opening on the tray body, and connecting the opening to the receiving cavity, it is convenient to assemble batteries, etc., by arranging the signal receiver and the signal transmitter in the receiving cavity at intervals, and electrically connecting the signal receiver and the signal transmitter to the controller, the signal transmitter sends an optical signal to the signal receiver, and at least part of the optical signal intersects with the depth direction of the receiving cavity. At the same time, the optical signal is received by the signal receiver and converted into an electrical signal and sent to the controller, so that the controller can determine whether there is a leak at the opening. Therefore, the battery pack tray provided by the present application arranges fewer monitoring components in a limited space, can accurately and effectively monitor leakage in the package, and thus improve the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 A schematic diagram of a portion of the structure of a battery pack tray provided in an embodiment of the present application;

[0033] Figure 2 A first flow chart of a battery pack leakage detection method provided in an embodiment of the present application;

[0034] Figure 3 A diagram showing the relationship between current signal and time in the battery pack leakage detection method provided in an embodiment of the present application.

[0035] Reference numerals:

[0036] 100: Tray body; 101: Accommodation cavity; 102: Opening; 103: Mounting portion; 110: Frame; 120: Bottom plate;

[0037] 200: signal transmitter;

[0038] 300: Signal receiver. DETAILED DESCRIPTION

[0039] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of methods and apparatus consistent with certain aspects of the present application, as detailed in the appended claims.

[0040] The terms "first," "second," "third," "fourth," etc. (if any) in the specification and claims of the present application and in the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential sequence. It should be understood that the numbers used in this way are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or apparatus.

[0041] Due to the complex operating conditions of new energy vehicle battery packs, water leakage incidents are more common than in previous battery pack operating environments. Research has shown that when new energy vehicles are driving through water or in the rain, the front of the vehicle is subjected to higher water pressure, which increases the risk of water leakage on the side near the front of the vehicle. Related technologies employ observation systems such as cameras and light sources within the confined space of the battery pack to detect color changes at the leak site, perform image analysis, and issue warning signals. However, this approach is not feasible and is prohibitively expensive. Furthermore, this system relies on a computer to perform convolution calculations on the image to achieve feature extraction, requiring a large amount of real-time computation, occupying a significant amount of computing capacity within the battery system and increasing the cost of the BMS system. Furthermore, color changes can only be detected using test paper, which is disposable and cannot be reused. Opening the battery pack repeatedly to replace the test paper is impractical both in terms of cost and practicality.

[0042] In response to the above-mentioned problems existing in the prior art, the present application provides a battery pack tray, battery pack, electrical equipment, and leakage detection method and system. The battery pack tray provided in the present application includes a tray body 100, a signal transmitter 200, and a signal receiver 300. By providing a receiving cavity 101 and an opening 102 on the tray body 100, and connecting the opening 102 with the receiving cavity 101, it is convenient to assemble batteries, etc. By arranging the signal receiver 300 and the signal transmitter 200 in the receiving cavity 101 at intervals, and electrically connecting the signal receiver 300 and the signal transmitter 200 to a controller, the signal transmitter 200 sends an optical signal to the signal receiver 300, and at least part of the optical signal intersects with the depth direction of the receiving cavity 101. At the same time, the optical signal is received by the signal receiver 300 and converted into an electrical signal and sent to the controller, so that the controller can determine whether there is a leak at the opening 102. With fewer monitoring components arranged in a limited space, the leakage situation in the package can be accurately and effectively monitored, thereby improving the safety of the battery pack.

[0043] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0044] First, please refer to Figure 1 As shown, an embodiment of the present application provides a battery pack tray, including a tray body 100, a signal transmitter 200 and a signal receiver 300.

[0045] The tray body 100 has a receiving cavity 101 and an opening 102 , and the opening 102 is communicated with the receiving cavity 101 .

[0046] The signal receiver 300 and the signal transmitter 200 are spaced apart and arranged in the accommodating cavity 101 . The signal receiver 300 and the signal transmitter 200 are used to be electrically connected to the controller.

[0047] The signal transmitter 200 is configured to transmit an optical signal toward the signal receiver 300, with at least a portion of the optical signal intersecting the depth direction of the accommodating cavity 101. The signal receiver 300 is configured to receive the optical signal and convert it into an electrical signal, which is then transmitted to the controller, so that the controller can determine whether there is leakage at the opening 102.

[0048] The tray body 100 in this embodiment is used to accommodate components such as batteries, battery modules, and distribution boxes, among which the structure is a frame structure, a shell structure, etc., and the outer shape is roughly rectangular. The tray body 100 has a accommodating cavity 101, and the accommodating cavity 101 can be used to place the above-mentioned components, which is roughly rectangular in shape. Moreover, in order to facilitate assembly, the tray body 100 is generally assembled from multiple components. The tray body 100 also has an opening 102, and the opening 102 is located at the top of the accommodating cavity 101. After the batteries, battery modules, distribution boxes and other components are installed, the opening 102 of the tray body 100 is assembled with the cover to form a whole.

[0049] The signal transmitter 200 in this embodiment is used to emit a light signal and can be positioned within the accommodating cavity 101, near the edge of one side opening 102. The signal receiver 300 in this embodiment is used to receive the light signal emitted by the signal transmitter 200 and can be a photoresistor or a photosensor. The signal receiver 300 can be positioned within the accommodating cavity 101, near the edge of the opening 102 on the same side as the signal transmitter 200, to ensure that if leakage occurs at the opening 102, the leaked liquid can flow through the path of the light signal.

[0050] It should be noted that at least part of the optical signal emitted by the signal transmitter 200 cannot be higher than the opening 102, and is preferably transmitted to the signal receiver 300 along a path close to the edge of the opening 102. In addition, when the battery pack tray is used in a new energy vehicle, since the side of the battery pack close to the front of the vehicle is more likely to be impacted by external liquids and has a greater pressure during driving, the side where the signal transmitter 200 and signal receiver 300 are installed is preferably facing the front of the vehicle, eliminating the need for a fully enclosed installation, thereby reducing unnecessary costs and operations.

[0051] Specifically, if Figure 1 As shown, the signal transmitter 200 sends an optical signal toward the signal receiver 300, and at least part of the optical signal intersects with the depth direction of the accommodating cavity 101. The depth direction of the accommodating cavity 101 is as shown in FIG. Figure 1 As shown in the opposite direction of the Z-axis, at least part of the optical signal is close to the edge of the opening 102, ensuring that the liquid that penetrates into the accommodating cavity 101 from the opening 102 can flow through the path of the optical signal. At the same time, the optical signal is received by the signal receiver 300 and converted into an electrical signal and sent to the controller. The controller compares the electrical signal with the signal threshold to determine whether there is leakage at the opening 102. If liquid penetrates into the opening 102, the liquid flows through the optical signal transmission path. Due to the reflection, refraction, diffraction, etc. of the liquid on the light, the optical signal received by the signal receiver 300 is greatly attenuated, and the converted electrical signal causes a large fluctuation, providing an effective basis for leakage judgment.

[0052] It is understood that, compared to water seepage monitoring systems that employ image recognition within confined spaces, the battery pack tray provided in the embodiments of this application utilizes fewer monitoring components within a limited space, enabling accurate and effective monitoring of leakage within the pack, thereby enhancing battery pack safety, enhancing operability, and reducing costs. Furthermore, since the signal transmitter 200 and signal receiver 300 are sealed within the darkened battery pack tray, monitoring requires only a relatively low-power power signal and emits a relatively weak light signal, resulting in low power consumption.

[0053] Therefore, the battery pack tray provided in the embodiment of the present application includes a tray body 100, a signal transmitter 200 and a signal receiver 300. By arranging a accommodating cavity 101 and an opening 102 on the tray body 100, and making the opening 102 communicate with the accommodating cavity 101, it is convenient to assemble batteries, etc., by arranging the signal receiver 300 and the signal transmitter 200 at intervals in the accommodating cavity 101, and making the signal receiver 300 and the signal transmitter 200 electrically connected to the controller, sending an optical signal toward the signal receiver 300 through the signal transmitter 200, and making at least part of the optical signal intersect with the depth direction of the accommodating cavity 101, and at the same time receiving the optical signal through the signal receiver 300 and converting it into an electrical signal and sending it to the controller, so that the controller can determine whether there is leakage at the opening 102. By arranging fewer monitoring components in a limited space, the leakage in the package can be accurately and effectively monitored, thereby improving the safety of the battery pack.

[0054] In some embodiments, the signal transmitter 200 is a parallel light transmitter configured to transmit a plurality of parallel light beams toward the signal receiver 300 .

[0055] At least a portion of the light beam intersects with the depth direction of the accommodating cavity 101 and is close to the edge of the opening 102 .

[0056] Specifically, the parallel light emitter can emit four, five, or several parallel light beams simultaneously, and at least some of the beam receiving cavities 101 intersect in depth direction and are close to the edge of the opening 102 .

[0057] In this way, when the liquid passes through the opening 102 under different pressures, the horizontal displacement is different, and the liquid will always fall on the path of one or several light beams, thereby further improving the accuracy of leakage monitoring.

[0058] The specific model and specifications of the parallel light emitter, as well as the specific number and thickness of the emitted parallel light beams and other parameters can be determined according to actual needs and are not specifically limited in this embodiment.

[0059] Furthermore, in this embodiment, the multiple light beams emitted by the collimator light emitter are spaced apart along a direction intersecting the depth direction of the accommodating cavity 101 and the propagation direction of the light beams. That is, the light beams emitted by the collimator light emitter are spaced apart along a direction approaching or away from the inner sidewall of the accommodating cavity 101.

[0060] Specifically, if Figure 1 As shown, each beam along Figure 1 The beams are arranged at intervals or side by side in the X-axis direction to adapt to the falling position of the liquid under different pressures. The more the number of beams and the smaller the spacing, the better the monitoring effect.

[0061] Furthermore, in this embodiment, the transmission direction of at least part of the light beam sent by the parallel light emitter is perpendicular to the depth direction of the accommodating cavity 101. That is, Figure 1 As shown, each light beam is transmitted in the horizontal direction. Figure 1 As shown in the Y-axis direction, the layout is more reasonable.

[0062] Furthermore, in this embodiment, the light beam sent by the parallel light emitter is located in the accommodating cavity 101. That is, it is not higher than the edge of the opening 102. Figure 1 As shown, each light beam can be located below the edge of the opening 102, which makes the arrangement more reasonable.

[0063] In some embodiments, the signal receiver 300 is arranged opposite to the signal transmitter 200. Figure 1 As shown, the signal receiver 300 and the signal transmitter 200 are along Figure 1 They are arranged relative to each other in the Y-axis direction, so that the optical signal emitted by the signal transmitter 200 can be received by the signal receiver 300 as much as possible, reducing light loss and improving monitoring accuracy.

[0064] In some embodiments, the tray body 100 has at least one mounting portion 103 . The mounting portion 103 is located in the accommodating cavity 101 and close to the edge of the opening 102 . The signal receiver 300 and / or the signal transmitter 200 is connected to the mounting portion 103 .

[0065] For example, Figure 1 As shown, the inner wall of the tray body 100 has two opposite mounting portions 103 , such as mounting platforms, mounting notches, etc., for fixing the signal receiver 300 and / or the signal transmitter 200 .

[0066] Of course, the mounting portion 103 can be replaced by other types of structures, such as mounting columns, mounting holes, etc., any structure that can facilitate the fixation of the signal receiver 300 or the signal transmitter 200 can be used, and can be determined according to actual needs. There are no excessive restrictions in this embodiment.

[0067] Furthermore, in this embodiment, the tray body 100 includes a frame 110 and a bottom plate 120 connected to one side of the frame 110 , the opening 102 is located on the side of the frame 110 away from the bottom plate 120 , and the mounting portion 103 is located on the side of the frame 110 facing the accommodating cavity 101 .

[0068] Specifically, if Figure 1 As shown, the frame 110 is a generally rectangular frame structure, and the bottom plate 120 can be connected to the bottom of the frame 110 by welding, screwing, etc. The opening 102 is located on the top surface of the frame 110, and the mounting portion 103 is located on the inner side wall of the frame 110.

[0069] Exemplarily, the frame 110 is formed by a plurality of side beams connected in sequence, and the signal receiver 300 and the signal transmitter 200 are connected to the same side beam.

[0070] For example, Figure 1 As shown, the frame 110 can be formed by four side beams connected in sequence, and the signal receiver 300 and the signal transmitter 200 are connected to the same side beam, that is, the mounting portion 103 is located on the inner side wall of the same side beam.

[0071] Of course, the frame 110 can also be formed by connecting a larger number of side beams. The specific shape, size, etc. of the frame 110 and the bottom plate 120 can be determined according to actual needs and are not specifically limited in this embodiment.

[0072] Secondly, embodiments of the present application further provide a battery pack, including the battery pack tray provided in any of the aforementioned embodiments. The battery pack tray may contain a distribution box, multiple batteries or battery modules, and the like. Of course, a cold plate, cover, and other components may also be placed on the battery pack tray to form the entire battery pack.

[0073] Among them, the structure of the battery pack tray has been introduced in detail in the above embodiments and will not be repeated here.

[0074] The battery pack provided in the embodiment of the present application is configured with a battery pack tray, which includes a tray body 100, a signal transmitter 200 and a signal receiver 300. By arranging a accommodating cavity 101 and an opening 102 on the tray body 100, and making the opening 102 communicate with the accommodating cavity 101, it is convenient to assemble batteries, etc., by arranging the signal receiver 300 and the signal transmitter 200 in the accommodating cavity 101 at intervals, and making the signal receiver 300 and the signal transmitter 200 electrically connected to the controller, sending an optical signal toward the signal receiver 300 through the signal transmitter 200, and making at least part of the optical signal intersect with the depth direction of the accommodating cavity 101, and at the same time receiving the optical signal through the signal receiver 300 and converting it into an electrical signal and sending it to the controller, so that the controller can determine whether there is leakage at the opening 102. Fewer monitoring components are arranged in a limited space, and leakage in the package can be accurately and effectively monitored, thereby improving the safety of the battery pack.

[0075] In a third aspect, embodiments of the present application further provide an electrical device comprising the battery pack provided in any of the above embodiments. The electrical device may be a new energy vehicle, an energy storage power station, or the like, and these electrical devices may be powered by the battery pack.

[0076] The electrical equipment provided in the embodiment of the present application is configured with a battery pack, which includes a battery pack tray, which includes a tray body 100, a signal transmitter 200 and a signal receiver 300. By arranging a accommodating cavity 101 and an opening 102 on the tray body 100, and making the opening 102 communicate with the accommodating cavity 101, it is convenient to assemble batteries, etc., by arranging the signal receiver 300 and the signal transmitter 200 in the accommodating cavity 101 at intervals, and making the signal receiver 300 and the signal transmitter 200 electrically connected to the controller, sending an optical signal toward the signal receiver 300 through the signal transmitter 200, and making at least part of the optical signal intersect with the depth direction of the accommodating cavity 101, and at the same time receiving the optical signal through the signal receiver 300 and converting it into an electrical signal and sending it to the controller, so that the controller can determine whether there is leakage at the opening 102. Fewer monitoring components are arranged in a limited space, and leakage in the package can be accurately and effectively monitored, thereby improving the safety of the battery pack.

[0077] Fourthly, please refer to Figure 2 As shown, an embodiment of the present application further provides a battery pack leakage detection method, which is used for the battery pack provided by any of the above embodiments, comprising:

[0078] S400 , sending an optical signal toward the signal receiver 300 via the signal transmitter 200 , wherein at least a portion of the optical signal intersects with the depth direction of the accommodating cavity 101 of the tray body 100 .

[0079] Specifically, a signal transmitter 200 can be disposed on one side of the battery pack, and a signal receiver 300 can be disposed on the other side of the battery pack. The signal transmitter 200 continuously transmits optical signals to the signal receiver 300, with at least a portion of the optical signals intersecting the depth direction of the accommodating cavity 101 and being close to the edge of the opening 102. When there is no leakage, all or most of the optical signals can reach the signal receiver 300. When there is leakage, liquid enters the accommodating cavity 101 from the opening 102, passing through the path of some optical signals, and thus preventing some optical signals from reaching the signal receiver 300.

[0080] S500: Receive the optical signal through the signal receiver 300 and convert it into an electrical signal and send it to the controller.

[0081] Specifically, the signal receiver 300 may be a photoresistor, which converts the received optical signal into an electrical signal through an amplification and processing circuit and sends it to the controller for subsequent processing. The electrical signal may be a current signal, a voltage signal, etc.

[0082] S600: Receive an electrical signal through a controller and compare it with a signal threshold. If the electrical signal exceeds the signal threshold, it is determined to be a leakage fault.

[0083] Specifically, the signal threshold can be a point value or a range. The controller can receive the electrical signal and compare it to the signal threshold. When the electrical signal exceeds the signal threshold, it is determined to be a leakage fault, and an alarm signal or alarm prompt can be issued. Therefore, a display, buzzer, alarm light, etc. can also be electrically connected to the controller to indicate or display leakage fault information, prompting the driver to stop the vehicle safely as soon as possible and promptly perform relevant drainage measures. If the electrical signal does not exceed the signal threshold, it is determined to be normal, that is, there is no leakage fault, and the controller analyzes the next electrical signal for continuous monitoring.

[0084] The battery pack leakage detection method provided in the embodiment of the present application can accurately and effectively monitor leakage inside the pack, thereby improving the safety of the battery pack.

[0085] Furthermore, in this embodiment, the electrical signal is a current signal. Thus, by converting the optical signal into a current signal, data processing, analysis, and determination are facilitated.

[0086] Furthermore, in this embodiment, the signal threshold is the maximum value of the change of the current signal within a preset time period when the battery pack is vibrating and there is no leakage.

[0087] First, if Figure 3 As shown, in actual working conditions or simulated working conditions and in the absence of leakage, the current signal is received by the controller, and the maximum value of the battery change of the current signal within a preset time period is calculated to obtain the current threshold ΔI0.

[0088] Specifically, when a new energy vehicle is driving, the vehicle body may vibrate or shake due to factors such as the road surface, which inevitably causes the signal transmitter 200 and signal receiver 300 to vibrate, causing fluctuations in the electrical signal collected by the signal receiver 300. However, since the change in light intensity signal caused by vehicle body vibration is limited, the resulting electrical signal fluctuations are relatively small. However, when leakage occurs, most of the light signal is blocked, reflected, or refracted, resulting in more significant electrical signal fluctuations.

[0089] Among them, by analyzing the actual road spectrum of new energy vehicles and combining the acceleration range of the vehicle, the battery pack is simulated to vibrate in the laboratory, or the optical signal under vibration is tested through actual working conditions. The signal transmitter 200 continuously sends an optical signal to the signal receiver 300, and the signal receiver 300 continuously receives the optical signal and converts it into a current signal to transmit to the controller. In this process, it is ensured that there is no leakage in the battery pack, and the controller obtains a current signal containing vibration factors and no leakage.

[0090] Moreover, the controller calculates the difference between the maximum current and the minimum current of the current signal within a preset time period to obtain the maximum difference in current change of the battery pack with vibration factors and no leakage, that is, the current threshold ΔI0.

[0091] Secondly, in actual working conditions, the current signal is received by the controller, and the maximum current change value of the current signal within a preset time period is calculated to obtain the actual current change value ΔI.

[0092] Specifically, while the vehicle is driving on an actual road, the signal transmitter 200 continuously sends a light signal to the signal receiver 300. The signal receiver 300 continuously receives the light signal, converts it into a current signal, and transmits it to the controller. The controller calculates the difference between the maximum and minimum currents of the current signal within a preset time period to obtain the actual current change value ΔI. If leakage occurs, ΔI will inevitably change significantly. If there is no leakage, ΔI should theoretically change little.

[0093] Finally, the controller compares the actual current change value ΔI with the current threshold ΔI0. If the real-time current change value ΔI is greater than the current threshold ΔI0, it is determined to be a leakage fault.

[0094] Specifically, the controller can determine the magnitude of the actual current change value ΔI and the current threshold ΔI0. If the actual current change value ΔI is greater than the current threshold ΔI0, a leakage fault is determined. If the actual current change value ΔI is less than or equal to the current threshold ΔI0, a leakage fault is determined. The specific value of the preset time length can be determined according to actual design requirements and is not specifically limited in this embodiment.

[0095] In this way, by fully considering the impact of vibration factors on the optical signal and then the electrical signal under actual working conditions of the battery pack, such changes are taken into account in the judgment of leakage, which greatly improves the precision and accuracy of the system and avoids false alarms.

[0096] In a fifth aspect, an embodiment of the present application further provides a battery pack leakage detection system, comprising a controller and a battery pack provided by any of the above embodiments, wherein the controller is electrically connected to the signal transmitter 200 and the signal receiver 300, respectively.

[0097] The controller is configured to receive the electrical signal and compare it with a signal threshold. If the electrical signal exceeds the threshold, it is determined to be a leakage fault. The controller can be a battery management system (BMS). By embedding the battery pack leakage detection system into the battery pack's BMS, the existing BMS is fully capable of completing this simple task, as it only requires simple electrical signal analysis without requiring additional calculations. This eliminates the need to expand the BMS computing system and incurs no additional costs.

[0098] The battery pack leakage detection system provided in the embodiment of the present application is configured with a battery pack, which includes a battery pack tray, which includes a tray body 100, a signal transmitter 200 and a signal receiver 300. By arranging a accommodating cavity 101 and an opening 102 on the tray body 100, and making the opening 102 communicate with the accommodating cavity 101, it is convenient to assemble batteries, etc., by arranging the signal receiver 300 and the signal transmitter 200 in the accommodating cavity 101 at intervals, and electrically connecting the signal receiver 300 and the signal transmitter 200 to the controller, sending an optical signal toward the signal receiver 300 through the signal transmitter 200, and making at least part of the optical signal intersect with the depth direction of the accommodating cavity 101, and at the same time receiving the optical signal through the signal receiver 300 and converting it into an electrical signal and sending it to the controller, so that the controller can determine whether there is a leak at the opening 102. Fewer monitoring components are arranged in a limited space, and leakage in the package can be accurately and effectively monitored, thereby improving the safety of the battery pack.

[0099] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of the present application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the claims.

[0100] It should be understood that the present application is not limited to the precise structure described above and shown in the appended drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A battery pack tray, characterized in that: include: A tray body (100), the tray body (100) having a receiving cavity (101) and an opening (102), the opening (102) being in communication with the receiving cavity (101); Signal transmitter (200); a signal receiver (300), the signal receiver (300) and the signal transmitter (200) being arranged in the accommodating cavity (101) at intervals, the signal receiver (300) and the signal transmitter (200) being used for being electrically connected to a controller; The signal transmitter (200) is configured to transmit an optical signal toward the signal receiver (300), wherein at least a portion of the optical signal intersects with the depth direction of the accommodating cavity (101), so that the liquid that penetrates into the accommodating cavity (101) from the opening (102) flows through the transmission path of the optical signal; the signal receiver (300) is configured to receive the optical signal and convert it into a current signal and transmit it to the controller, and the controller compares the actual current change value with the current threshold value to determine whether leakage occurs at the opening (102); The actual current change value is the maximum value of the current signal change within a preset time period, and the current threshold is the maximum value of the current signal change within a preset time period when the battery pack vibrates and has no leakage.

2. The battery pack tray according to claim 1, characterized in that: The signal transmitter (200) is a parallel light transmitter, and the parallel light transmitter is configured to transmit a plurality of parallel light beams toward the signal receiver (300); At least part of the light beam intersects with the depth direction of the accommodating cavity (101) and is close to the edge of the opening (102).

3. The battery pack tray according to claim 2, characterized in that: The plurality of light beams emitted by the parallel light emitter are arranged at intervals along a direction intersecting the depth direction of the accommodating cavity (101) and the transmission direction of the light beams.

4. The battery pack tray according to claim 2, wherein: The transmission direction of at least part of the light beam sent by the parallel light transmitter is perpendicular to the depth direction of the accommodating cavity (101).

5. The battery pack tray according to claim 2, characterized in that: The light beam sent by the parallel light transmitter is located in the accommodating cavity (101).

6. The battery pack tray according to claim 1, characterized in that: The signal receiver (300) is arranged opposite to the signal transmitter (200).

7. The battery pack tray according to any one of claims 1 to 6, characterized in that: The tray body (100) has at least one mounting portion (103), the mounting portion (103) being located in the accommodating cavity (101) and close to the edge of the opening (102), and the signal receiver (300) and / or the signal transmitter (200) being connected to the mounting portion (103).

8. The battery pack tray according to claim 7, characterized in that: The tray body (100) comprises a frame (110) and a bottom plate (120) connected to one side of the frame (110); the opening (102) is located on a side of the frame (110) facing away from the bottom plate (120); and the mounting portion (103) is located on a side of the frame (110) facing the accommodating cavity (101).

9. The battery pack tray according to claim 8, characterized in that: The frame (110) is formed by a plurality of side beams connected in sequence, and the signal receiver (300) and the signal transmitter (200) are connected to the same side beam.

10. A battery pack, characterized in that: Comprising a battery pack tray as described in any one of claims 1 to 9.

11. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 10.

12. A battery pack leakage detection method, characterized in that: include: sending an optical signal toward a signal receiver (300) via a signal transmitter (200), wherein at least a portion of the optical signal intersects with a depth direction of the accommodating cavity (101) of the tray body (100), so that liquid that penetrates into the accommodating cavity (101) from the opening (102) of the tray body (100) flows through a transmission path of the optical signal; The signal receiver (300) receives the optical signal and converts it into a current signal and sends it to a controller; The controller receives the current signal and compares the actual current change value with the current threshold value, and if the actual current change value exceeds the current threshold value, determines that the opening (102) is a leakage fault; The actual current change value is the maximum value of the current signal change within a preset time period, and the current threshold is the maximum value of the current signal change within a preset time period when the battery pack vibrates and has no leakage.

13. A battery pack leakage detection system, characterized in that: comprising a controller and the battery pack according to claim 10, wherein the controller is electrically connected to the signal transmitter (200) and the signal receiver (300) respectively; The controller is configured to receive a current signal and compare an actual current change value with a current threshold, and determine a leakage fault if the actual current change value exceeds the current threshold.

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