Battery pack and vehicle

Abstract

The utility model provides a battery pack and a vehicle, the battery pack comprises a box body, the box body comprises a mounting frame, a cover plate and a cooling plate, an accommodating space is defined by the mounting frame, the cover plate and the cooling plate, and a battery assembly is arranged in the accommodating space; the bottom protection plate is located under the cooling plate, the bottom protection plate comprises a mounting part and a connecting part, the mounting part is provided with a mounting groove, and the bottom protection plate is detachably connected with the bottom end face of the mounting frame through the connecting part; the detection assembly is electrically connected with the battery assembly and comprises a light-emitting part, a first visual sensor, a second visual sensor and a third visual sensor, the light-emitting part and the first visual sensor are arranged on the groove wall of one side in the width direction of the mounting groove, and the third visual sensor is arranged on the groove wall of the other side in the width direction of the mounting groove; and second visual sensors are arranged on two side groove walls in the length direction of the mounting groove. According to the utility model, the damage degree of the battery pack after collision can be accurately identified and effectively quantified.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, and in particular to a battery pack and a vehicle. Background Technology

[0002] In the overall architecture of electric vehicles, the battery pack is a core component, usually located at the bottom of the vehicle. During vehicle operation, the bottom of the battery pack is easily damaged by road bumps or stones. When the damage to the bottom of the battery pack exceeds the safety threshold, it can easily trigger serious safety accidents such as battery short circuits and fires, seriously threatening the safety of the vehicle and its occupants. Therefore, the accuracy of detecting the degree of damage to the bottom of the battery pack is crucial.

[0003] Currently, there are two main methods for detecting damage to the bottom of a battery pack after an impact: The first method involves installing vibration or acceleration sensors on the bottom plate of the battery pack. These sensors can collect vibration or acceleration changes caused by external forces in real time when the bottom of the battery pack is impacted, thereby detecting the impact load on the bottom of the battery pack. However, this method can only obtain vibration or acceleration information and cannot identify key parameters such as deformation and displacement of the bottom of the battery pack after the impact, resulting in an inaccurate assessment of the severity of the impact. The second method involves laying detection circuits on the bottom plate of the battery pack. When the deformation of the bottom plate caused by the impact exceeds a preset value or a breakdown occurs, the voltage and current of the detection circuit will change accordingly, and even an open circuit may occur. However, this method requires laying detection circuits over a large area of ​​the entire bottom plate, resulting in high production costs and difficulty in effectively quantifying the degree of deformation of the bottom plate, making it impossible to accurately identify the degree of damage caused by deformation. Utility Model Content

[0004] Based on this, the purpose of this utility model is to provide a battery pack and vehicle that aims to solve the technical problems of existing methods for detecting damage to the bottom of the battery pack after an impact: the method of installing vibration sensors or acceleration sensors cannot identify key parameters such as deformation and displacement of the bottom of the battery pack after an impact, and cannot accurately determine the severity of the impact; while the method of laying detection circuits on the bottom protection plate of the battery pack requires laying detection circuits over a large area of ​​the bottom protection plate, which is costly to produce and makes it difficult to effectively quantify the degree of deformation of the bottom protection plate, thus failing to achieve accurate identification of the degree of damage caused by deformation.

[0005] One aspect of this utility model is to provide a battery pack, comprising:

[0006] The housing includes a mounting frame, a cover plate adapted to the top of the mounting frame, and a cooling plate disposed at the bottom of the mounting frame. The mounting frame, the cover plate, and the cooling plate together form an accommodating space, in which a battery assembly is disposed. A low-voltage connector and a high-voltage interface are disposed on one side of the mounting frame.

[0007] The bottom guard plate is located directly below the cooling plate. The bottom guard plate includes a mounting part and a connecting part integrally connected to the mounting part. The mounting part is provided with a mounting groove. The bottom guard plate is detachably connected to the bottom end face of the mounting frame through the connecting part.

[0008] A detection component is electrically connected to the battery assembly. The detection component includes a light-emitting element, a first visual sensor, a second visual sensor, and a third visual sensor. At least two light-emitting elements and at least two first visual sensors are spaced apart on one side wall of the mounting groove in the width direction. At least two third visual sensors are spaced apart on the other side wall of the mounting groove in the width direction. At least three second visual sensors are spaced apart on both sides wall of the mounting groove in the length direction.

[0009] Compared to existing technologies, the advantages of this battery pack are as follows: A detection component is installed on the bottom protective plate of the battery pack, and this component is located on the circumferential wall of the mounting groove of the bottom protective plate. This allows for precise identification of the degree of mechanical damage or water ingress on the bottom protective plate. When the bottom protective plate is deformed by external foreign objects, the detection component will not be damaged simultaneously. During maintenance, only the bottom protective plate itself needs to be replaced, without replacing the entire detection component, significantly reducing maintenance costs. Furthermore, after the battery pack in this application is deformed by external foreign objects, the morphology, amount of deformation, specific location, or coordinates of the deformation features on the bottom protective plate can be detected to quantitatively assess and accurately determine the degree of harm and damage caused by different deformation features. Alternatively, it can detect water ingress and its extent caused by penetrating damage to the bottom protective plate, thereby prompting the driver to promptly perform necessary maintenance on the battery pack and effectively preventing the battery pack failure from escalating.

[0010] In addition, the battery pack according to the present invention may also have the following additional technical features:

[0011] Furthermore, the mounting frame is provided with a first partition and a second partition, which are arranged perpendicularly to each other, and one end of the second partition is connected to the middle of one side panel of the first partition to divide the accommodating space into an electrical compartment and two battery compartments.

[0012] Furthermore, the mounting frame is provided with a first mounting hole and a second mounting hole. The first mounting hole and the second mounting hole are located on the side where the electrical compartment is located and are respectively connected to the electrical compartment. The first mounting hole is used to install the low-voltage connector, and the second mounting hole is used to install the high-voltage interface.

[0013] Furthermore, the battery assembly includes a power distribution box located within the electrical compartment, and the power distribution box is electrically connected to the low-voltage connector, the high-voltage interface, and the detection component.

[0014] Furthermore, the power distribution box is equipped with a BMS control module, which is used to receive information collected by the first vision sensor, the second vision sensor and the third vision sensor.

[0015] Furthermore, the battery assembly also includes multiple battery modules, which are evenly spaced within the two battery compartments, and the battery modules are electrically connected to the power distribution box via conductors.

[0016] Furthermore, the battery pack also includes a cooling interface, which is connected to the flow channel inside the cooling plate, and the cooling interface and the high-voltage interface are both located on the same side of the mounting frame.

[0017] Another aspect of this utility model is to provide a vehicle that includes the aforementioned battery pack. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the battery pack of this utility model;

[0019] Figure 2 This is an exploded view of the battery pack of this utility model;

[0020] Figure 3 This is a schematic diagram of the bottom protective plate and detection components of the battery pack of this utility model;

[0021] Figure 4 This is a cross-sectional view of the battery pack of this utility model;

[0022] Figure 5 This is a cross-sectional view of the battery pack after the first indentation appears on the bottom protective plate of the battery pack of this utility model.

[0023] Figure 6 This is a schematic diagram of the state of the bottom protective plate of the battery pack of this utility model after the first indentation appears, and the corresponding first shadow.

[0024] Figure 7This is a schematic diagram illustrating the principle of how the first shadow area is generated after the first pit appears on the bottom protective plate in this utility model.

[0025] Figure 8 This is a cross-sectional view of the battery pack after the second indentation appears on the bottom protective plate of the battery pack of this utility model.

[0026] Figure 9 This is a schematic diagram showing the state of the bottom protective plate of the battery pack of this utility model after the second indentation appears, and the corresponding second shadow.

[0027] Figure 10 This is a schematic diagram of the water ingress state of the bottom protective plate in this utility model after it has been subjected to penetrating damage.

[0028] Figure 11 This is a schematic diagram showing the light refraction state on the surface of the bottom protective plate of this utility model after water has entered it.

[0029] The above-mentioned figures include the following reference numerals: 10-box body; 11-mounting frame; 12-cover plate; 13-cooling plate; 14-first partition; 15-second partition; 101-electrical compartment; 102-battery compartment; 21-distribution box; 22-battery module; 30-bottom protective plate; 31-mounting part; 32-connection part; 301-mounting groove; 41-low voltage connector; 42-high voltage interface; 43-cooling interface; 51-light-emitting element; 52-first vision sensor; 53-second vision sensor; 54-third vision sensor; 61-first recess; 611-first shadow; 62-second recess; 621-second shadow; 63-water inlet area.

[0030] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0031] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0032] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] Please see Figures 1 to 4 The image shows a battery pack of this utility model, including a housing 10, a bottom protective plate 30, and a detection component. The housing 10 includes a mounting frame 11, a cover plate 12 adapted to the top of the mounting frame 11, and a cooling plate 13 located at the bottom of the mounting frame 11. The mounting frame 11, cover plate 12, and cooling plate 13 together form a receiving space, within which a battery assembly is housed. A low-voltage connector 41 and a high-voltage interface 42 are located on one side of the mounting frame 11. Specifically, in this embodiment, the mounting frame 11 contains a first partition 14 and a second partition 15, which are perpendicular to each other. One end of the second partition 15 is connected to the middle of one side panel of the first partition 14 to divide the receiving space formed by the mounting frame 11, cover plate 12, and cooling plate 13 into an electrical compartment 101 and two battery compartments 102. Figure 2 As shown in the figure, in this embodiment, the first partition 14 divides the front area of ​​the mounting frame 11 into an electrical compartment 101, and the second partition 15 divides the rear area of ​​the mounting frame 11 into two battery compartments 102.

[0035] Furthermore, the mounting frame 11 is also provided with a first mounting hole and a second mounting hole. The first mounting hole and the second mounting hole are located on the side where the electrical compartment 101 is located and are respectively connected to the electrical compartment 101. The first mounting hole is used to install the low-voltage connector 41, and the second mounting hole is used to install the high-voltage interface 42.

[0036] In this embodiment, the battery assembly includes a power distribution box 21, which is located within the electrical compartment 101 and is electrically connected to a low-voltage connector 41, a high-voltage interface 42, and a detection assembly. Specifically, the power distribution box 21 contains a BMS control module, relays, fuses, and other devices. The BMS control module receives information collected by the first visual sensor 52, the second visual sensor 53, and the third visual sensor 54 in the detection assembly.

[0037] Furthermore, the battery assembly also includes multiple battery modules 22, which are evenly spaced within the two battery compartments 102. All battery modules 22 are electrically connected to the power distribution box 21 via conductors. In this embodiment, the cooling plate 13, located at the bottom of the mounting frame 11, not only supports the battery modules 22 but also regulates their temperature. Furthermore, the battery pack of this application also includes a cooling interface 43, located in the middle of one side of the cooling plate 13 and communicating with the internal flow channels of the cooling plate 13. When the cooling plate 13 is installed at the bottom of the mounting frame 11, the cooling interface 43 and the high-voltage interface 42 are both located on the same side of the mounting frame 11.

[0038] As an example, the bottom guard plate 30 in this application is located directly below the cooling plate 13. The bottom guard plate 30 provides mechanical protection and sealing for the battery pack. Specifically, the bottom guard plate 30 includes a mounting part 31 and a connecting part 32 integrally connected to the mounting part 31. The mounting part 31 is provided with a mounting groove 301. The bottom guard plate 30 is detachably connected to the bottom end face of the mounting frame 11 through the connecting part 32. The mounting groove 301 creates a buffer space between the inner side surface of the bottom guard plate 30 and the surface of the cooling plate 13. In this way, when the bottom guard plate 30 is impacted by an external object, the impact load on the bottom guard plate 30 can be effectively prevented from being directly applied to the cooling plate 13, protecting the flow channel of the cooling plate 13 from deformation or damage, and thus protecting the multiple battery modules 22 located above the cooling plate 13 from being squeezed and deformed.

[0039] Furthermore, a sealing groove is provided on the connecting part 32 of the bottom guard plate 30. The sealing groove is used to apply sealant or install a sealing strip, thereby effectively preventing water or foreign objects from entering the mounting groove 301 on the bottom guard plate 30 through the gap between the bottom guard plate 30 and the bottom end face of the mounting frame 11, so as to avoid affecting the detection of the detection component in the mounting groove 301.

[0040] Furthermore, the underbody protection plate 30 in this embodiment is made of steel, which can also be understood as the underbody protection plate 30 being made of high-strength steel, giving it good yield strength and tensile strength. Thus, when the underbody protection plate 30 is deformed by external objects or subjected to external mechanical loads, if the external force on the underbody protection plate 30 is less than its yield strength, the deformation will automatically rebound after the external force is removed. If the external force on the underbody protection plate 30 is greater than its yield strength but less than its tensile strength, the underbody protection plate 30 will undergo permanent deformation, leaving a corresponding pit shape, which will appear as an upward bulge or arch. If the external force on the underbody protection plate 30 is greater than its tensile strength, the underbody protection plate 30 will crack, i.e., suffer penetrating damage. In this case, water will enter the underbody protection plate 30 when the vehicle is wading through water.

[0041] As an example, the detection component in this application is electrically connected to the power distribution box 21 in the battery assembly. The power distribution box 21 can be used to power the detection component, and the detection component interacts with the BMS control module. Specifically, the detection component includes a light-emitting element 51, a first visual sensor 52, a second visual sensor 53, and a third visual sensor 54. At least two light-emitting elements 51 and at least two first visual sensors 52 are spaced apart on one side wall of the mounting groove 301 in the width direction, at least two third visual sensors 54 are spaced apart on the other side wall of the mounting groove 301 in the width direction, and at least three second visual sensors 53 are spaced apart on both sides of the mounting groove 301 in the length direction.

[0042] As a specific example, in this embodiment, such as Figure 3 As shown, with the length direction of the mounting groove 301 in the bottom protective plate 30 as the X-axis, and the X-direction shown in the figure as the front of the battery pack, two third vision sensors 54 are spaced apart on the groove wall of the mounting groove 301 located at the front of the battery pack, and two light-emitting elements 51 and two first vision sensors 52 are spaced apart on the groove wall of the mounting groove 301 located at the rear of the battery pack, with the two first vision sensors 52 located between the two light-emitting elements 51. Three second vision sensors 53 are spaced apart on the groove walls of the mounting grooves 301 located on the left and right sides of the battery pack, respectively. In actual use, the inner side of the bottom cover plate 30 is set to a relatively rough surface. When the light emitted by the light-emitting element 51 shines on the inner side of the bottom cover plate 30 at a certain angle, diffuse reflection will occur. The first vision sensor 52, the second vision sensor 53 and the third vision sensor 54 located on the circumferential wall of the mounting groove 301 will receive the light reflected by the inner side of the bottom cover plate 30, thereby identifying the shape information features of the inner side of the bottom cover plate 30 and transmitting the information to the BMS control module in the power distribution box 21. The BMS control module determines whether there is an abnormality at the bottom of the battery pack by comparing the received shape information features with the stored preset shape information features.

[0043] This utility model also provides a vehicle, which includes the battery pack described in the above embodiments.

[0044] In practical use, the operating principle of the battery pack of this utility model can be as follows:

[0045] like Figure 4As shown, when the bottom guard plate 30 does not undergo additional compression deformation, there are no protrusions on the inner side of the bottom guard plate 30 other than the preset features. With the help of the light emitted by the two light-emitting elements 51 and the light reflected by the inner side of the bottom guard plate 30, the first vision sensor 52, the second vision sensor 53 and the third vision sensor 54 can identify or scan the preset features on the inner side of the bottom guard plate 30 and transmit the information to the BMS control module. The BMS control module determines that there is no mechanical deformation at the bottom of the battery pack and does not send any related fault signals to the vehicle controller.

[0046] like Figures 5 to 7 As shown, when the bottom protective plate 30 is deformed by external foreign objects or subjected to external mechanical loads, a first pit 61 is generated in the bottom protective plate 30. Specifically, the first pit 61 is caused by the compression of a spherical or circular object, making the first pit 61 appear as an upward spherical or arc-shaped protrusion. At this time, the light emitted by the light-emitting element 51 shines on the inner surface of the bottom protective plate 30 at a certain angle. The light emitted by the light-emitting element 51 is in the direction shown by the X-axis. Due to the blocking of the light U1 from the light-emitting element 51 by the first pit 61, a first shadow 611 is generated between the first pit 61 and the third visual sensor 54. Since the area where the first shadow 611 is located lacks diffuse reflection light, the first shadow 611 is identified as a dark area in the image of the second visual sensor 53, and the length L1 of the first shadow 611 can be identified and measured by the second visual sensor 53. Similarly, the third visual sensor 54 can also identify the first shadow 611 region and measure the width B1 of the first shadow 611, which is also the width of the first pit 61; the first visual sensor 52 can measure the height H1 of the first pit 61, and the second visual sensor 53 can measure the length A1 of the first pit 61. It should be understood that the optical and visual-based size measurement and image processing / synthesis described above are existing technologies and will not be elaborated further.

[0047] Firstly, the BMS control module can calculate the danger factor of the first recess 61 by combining its length A1, width B1, and height H1. Specifically, the ratio of the length A1 to the width B1 of the first recess 61 can quantify the first sharpness factor of the first recess 61 in the horizontal plane; the closer A1 / B1 is to 1, the lower the danger factor. The greater the difference between the length A1 and the width B1 of the first recess 61, the more easily the bottom protective plate 30 is damaged / broken. The ratio of the length A1, width B1, and height H1 of the first recess 61 can quantify the second sharpness factor of the first recess 61 in the vertical plane; the smaller H1 / A1 and H1 / B1 are, the lower the danger factor. The smaller the deformation of the first recess 61 in the Z-direction, the safer the bottom protective plate 30, the cooling plate 13, and the battery module 22.

[0048] Secondly, the BMS control module can synthesize / fit images from multiple first vision sensors 52, second vision sensors 53, and third vision sensors 54 to calculate the 3D shape of the first recess 61. The BMS control module can assess the hazard factor of the first recess 61 based on its 3D shape. For example, a sharp recess shape has a higher hazard factor than a rounded recess shape because a sharp recess is more likely to cause damage to the bottom protective plate 30 and may also exert greater stress on the cooling plate 13 and battery module 22. Specifically, the BMS control module can compare the 3D shape of the first recess 61 with a pre-stored database to calculate / assess its hazard factor. Specifically, the pre-stored database contains the maximum allowable deformation height for recesses of different lengths / widths. Exceeding the maximum deformation height will cause the bottom protective plate 30 to crack. The pre-stored database can be derived from batch calculations and simulations using CAE software and stored within the BMS control module. Specifically, the BMS control module can find the maximum allowable deformation height H3 by comparing the length A1 and width B1 of the first recess 61 with the pre-stored database. The smaller H1 / H3 is, the lower the risk factor. When H1 / H3≥1, it is determined that the bottom guard plate 30 is at risk of cracking.

[0049] Thirdly, the BMS control module can also calculate a safety factor for judging the state of the cooling plate 13. Specifically, the distance between the inner side of the bottom guard plate 30 and the lower surface of the cooling plate 13 can be set to H2. From a static perspective, when the height H1 of the first recess 61 is less than H2, the first recess 61 will not contact or squeeze the cooling plate 13. However, the stroke of the first recess 61 is dynamic. During the squeezing or impact process, the bottom guard plate 30 will bend and deform upward as a whole. After the mechanical load is removed, the bottom guard plate 30 will rebound or reset. The first recess 61 is a permanent deformation after rebound. Therefore, even when the height H1 of the first recess 61 is less than H2, the cooling plate 13 may still be dynamically squeezed, and the flow channel of the cooling plate 13 may be flattened and damaged.

[0050] Fourthly, using the coordinate information of the first pit 61, the BMS control module can accurately calculate or assess the hazard level of the first pit 61. The second visual sensor 53 can locate the position of the first pit 61 in the X direction, and the third visual sensor 54 can locate the position of the first pit 61 in the Y direction. Combining the positions of the first pit 61 in the X and Y directions, i.e., the coordinates of the first pit 61 at the bottom of the battery pack 1, the BMS control module compares the coordinates of the first pit 61 with the arrangement position of the battery module 22, and can identify the threat and hazard level of the first pit 61 to the battery module 22. Specifically, the hazard level of the first pit 61 located in the area below the battery compartment 102102 is higher than that of the area below the electrical compartment 101101. The specific location or coordinates of the first pit 61 in the area below the electrical compartment 101101 are different, and its hazard level is also different. For example, the hazard level of the first pit 61 located below the battery module 22 is higher than that located below the second partition 15.

[0051] As a specific example, in this embodiment, in the first aspect, A1 / B1 = 1.2, H1 / A1 = 0.3, H1 / B1 = 0.36, then the risk factor of the first dent 61 is judged to be low. In the second aspect, H1 / H3 = 0.4, then the risk of the bottom protective plate 30 breaking is judged to be low. In the third aspect, H1 / H2 = 0.5, then the safety factor of the first dent 61 is judged to be medium. In the fourth aspect, since the first dent 61 is located below the battery module 22 of the battery compartment 102102, the hazard level of the first dent 61 is judged to be high.

[0052] In summary, the BMS control module in this embodiment assesses the first dent 61 and ultimately determines that the first dent 61 has a low risk factor, a medium safety factor, and a high hazard level, indicating that the battery module 22 may have been subjected to impact or compressive force. The BMS control module integrates these warning messages and sends them to the vehicle controller, which further displays these warning messages on the vehicle's instrument panel or screen to remind the driver to promptly inspect the battery pack.

[0053] like Figures 8 to 9As shown, when the bottom guard plate 30 is deformed by external foreign objects or subjected to external mechanical loads, a second indentation 62 is generated in the bottom guard plate 30. Specifically, the second indentation 62 is caused by the compression of non-spherical and non-circular objects, making the first indentation 61 appear as an upward-facing square protrusion. Similarly, a second shadow 621 is generated between the second indentation 62 and the third visual sensor 54. The length L2 of the second shadow 621 can be identified and measured by the second visual sensor 53. The third visual sensor 54 can measure the width B2 of the second indentation 62, the first visual sensor 52 can measure the height H4 of the second indentation 62, and the second visual sensor 53 can measure the length A2 of the second indentation 62. As a specific example, in this embodiment, A1 / B1 = 1.2, A2 / B2 = 4.5, and H4 > H1. The second indentation 62 is sharper than the first indentation 61, and therefore, the second indentation 62 has a higher risk factor.

[0054] Furthermore, the BMS control module can assess the risk factor of the second recess 625 by its 3D shape, and find the maximum allowable deformation height H5 by comparing the length A2 and width B2 of the second recess 62 with the pre-stored database. As a specific example, in this embodiment, H4 / H5 = 1.3, which indicates a high risk of cracking of the bottom guard plate 30.

[0055] Furthermore, in this embodiment, the safety factor of the second pit 62 is H4 / H2 = 0.6.

[0056] Furthermore, based on the coordinates of the second dent 62, the BMS control module identifies that the second dent 62 is located below the second partition 15 of the battery compartment 102102, and identifies its hazard level as low.

[0057] In summary, the BMS control module assesses the second dent 62 and determines the risk level as follows: High; High safety level; Low hazard grade. The underbody protection plate 30 may crack, and the cooling plate 13's flow channels may be flattened and damaged. The BMS control module integrates these warning messages and sends them to the vehicle controller, which further displays these warning messages on the vehicle's instrument panel or screen to remind the driver to promptly inspect the battery pack.

[0058] like Figures 10 to 11 As shown, when the underbody protection plate 30 suffers penetrating damage, water will enter the interlayer space between the underbody protection plate 30 and the cooling plate 13 when the vehicle is wading through water, causing liquid water to accumulate on the inner side of the underbody protection plate 30, thus forming a water ingress area 63. The light U2 emitted by the light-emitting element 51 will cause mirror reflection when it shines on the water ingress area 63, that is, the mirror-reflected light U3 is directed towards the third vision sensor 54; the light U3 can only be detected by the third vision sensor 54.

[0059] Figure 11 The light emitted by the light-emitting element 51 illuminates other rough areas on the inner side of the bottom protective plate 30. The light U4 illuminates the bottom protective plate 30 and undergoes diffuse reflection, emitting light rays U5, U6, etc. in various directions. The light rays U4 diffusely reflected on the bottom protective plate 30 can be detected by multiple first vision sensors 52, second vision sensors 53 and third vision sensors 54 at different positions.

[0060] Specifically, the third visual sensor 54 detects that the water ingress area 63 is highlighted, while the first visual sensor 52 and the second visual sensor 53 detect that the water ingress area 63 is darker than other areas. The BMS control module can identify the presence of the water ingress area 63 in the mounting slot 301 of the underbody protection plate 30 based on this principle. Furthermore, it can determine the amount and severity of water ingress in the water ingress area 63 by analyzing the area of ​​the highlighted area detected by the third visual sensor 54 and the area of ​​the dark area detected by the first and second visual sensors 52 and 53. The BMS control module integrates these warning messages and sends them to the vehicle controller, which then displays these warning messages on the vehicle's instrument panel or screen to remind the driver to check the battery pack promptly.

[0061] In summary, the beneficial effects of this utility model's battery pack are as follows: The detection component of this application is disposed on the circumferential groove wall of the mounting groove of the bottom guard plate, which can accurately identify the degree of mechanical damage or water ingress of the bottom guard plate. Furthermore, when the bottom guard plate is deformed by external foreign objects, the detection component will not be damaged simultaneously. During maintenance, only the bottom guard plate itself needs to be replaced, without replacing the entire detection component, greatly reducing maintenance costs. Further, after the battery pack of this application is deformed by external foreign objects, it can detect the morphology, amount of deformation, specific location, or coordinates of the deformation characteristics of the bottom guard plate, thereby quantitatively assessing and accurately judging the degree of harm and damage of different deformation characteristics, or detecting water ingress and its extent caused by penetrating damage to the bottom guard plate. This allows the driver to be alerted to timely and necessary maintenance of the battery pack, effectively preventing the battery pack failure from escalating.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model application should be determined by the appended claims.

Claims

1. A battery pack, characterized by, include: The housing includes a mounting frame, a cover plate adapted to the top of the mounting frame, and a cooling plate disposed at the bottom of the mounting frame. The mounting frame, the cover plate, and the cooling plate together form an accommodating space, in which a battery assembly is disposed. A low-voltage connector and a high-voltage interface are disposed on one side of the mounting frame. The bottom guard plate is located directly below the cooling plate. The bottom guard plate includes a mounting part and a connecting part integrally connected to the mounting part. The mounting part is provided with a mounting groove. The bottom guard plate is detachably connected to the bottom end face of the mounting frame through the connecting part. A detection component is electrically connected to the battery assembly. The detection component includes a light-emitting element, a first visual sensor, a second visual sensor, and a third visual sensor. At least two light-emitting elements and at least two first visual sensors are spaced apart on one side wall of the mounting groove in the width direction. At least two third visual sensors are spaced apart on the other side wall of the mounting groove in the width direction. At least three second visual sensors are spaced apart on both sides wall of the mounting groove in the length direction.

2. The battery pack of claim 1, wherein, The mounting frame is provided with a first partition and a second partition, which are arranged perpendicular to each other. One end of the second partition is connected to the middle of one side panel of the first partition to divide the accommodating space into an electrical compartment and two battery compartments.

3. The battery pack of claim 2, wherein, The mounting frame is provided with a first mounting hole and a second mounting hole. The first mounting hole and the second mounting hole are located on the side where the electrical compartment is located and are respectively connected to the electrical compartment. The first mounting hole is used to install the low-voltage connector, and the second mounting hole is used to install the high-voltage interface.

4. The battery pack of claim 3, wherein, The battery assembly includes a power distribution box located within the electrical compartment, and the power distribution box is electrically connected to the low-voltage connector, the high-voltage interface, and the detection component.

5. The battery pack of claim 4, wherein, The power distribution box is equipped with a BMS control module, which is used to receive information collected by the first vision sensor, the second vision sensor and the third vision sensor.

6. The battery pack of claim 4, wherein, The battery assembly also includes multiple battery modules, which are evenly spaced within the two battery compartments and are electrically connected to the power distribution box via conductors.

7. The battery pack of claim 1, wherein, The battery pack also includes a cooling interface, which is connected to the flow channel inside the cooling plate, and the cooling interface and the high-voltage interface are both located on the same side of the mounting frame.

8. A vehicle characterized by comprising: The vehicle includes the battery pack as described in any one of claims 1 to 7.

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