Air pressure sensor and battery pack
By designing a protrusion and an elastic seal in the pressure sensor, the flow of foam into the pores is prevented, thus solving the problem of pore blockage caused by foam overflow and improving the stability and detection accuracy of the pressure sensor in the battery pack.
Patent Information
- Application Number
- CN202423323149.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In the battery pack, the foam overflows before it cures, causing blockage of the air pores in the pressure sensor and affecting the accuracy and reliability of the sensor.
A pressure sensor is designed, including a housing, a sensing element, and an elastic seal. The housing has a protrusion and a receiving groove. The protrusion prevents foam from flowing into the receiving groove. The elastic seal is used to abut against the mounting part in the receiving groove and communicates with the through hole of the mounting part through the opening to ensure unobstructed gas flow path.
This effectively prevents the expanding foam from reaching the pores, improving the stability and reliability of the pressure sensor and ensuring the accuracy and reliability of the test results.
Smart Images
Figure CN223796167U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, specifically to a pressure sensor and a battery pack. Background Technology
[0002] In related technologies, a pressure sensor is installed in the battery pack to detect the internal air pressure. When the battery pack is filled using a foaming process, the foam is in a fluid state before curing. Its fluidity may cause material to overflow into the pores of the pressure sensor, easily leading to pore blockage, abnormal signal transmission, and consequently affecting the accuracy and reliability of the sensor. Utility Model Content
[0003] The present invention provides a pressure sensor and a battery pack that can improve the technical problem of air pore blockage caused by foam overflow.
[0004] In a first aspect, embodiments of the present invention provide a pressure sensor for a battery pack, the pressure sensor comprising:
[0005] The housing has a mounting cavity. On the side of the housing opposite to the mounting cavity, there is a protrusion and a receiving groove. At least a portion of the protrusion is arranged around the outer periphery of the receiving groove. The side of the protrusion opposite to the mounting cavity is used to abut against the mounting part of the battery pack. The bottom of the receiving groove is provided with an air hole communicating with the mounting cavity.
[0006] A sensing element is disposed within the mounting cavity; and,
[0007] An elastic seal is disposed in the receiving groove and is used to abut against the mounting portion. The elastic seal has an opening that communicates with the air hole and is used to communicate with the through hole of the mounting portion.
[0008] In one embodiment, the height of the protrusion is between 0.1 mm and 0.3 mm.
[0009] In one embodiment, the bottom of the receiving groove is further provided with a boss, the boss is arranged around the outer periphery of the air hole, the boss is located inside the opening and abuts against the inner wall of the opening.
[0010] In one embodiment, the side of the protrusion facing away from the bottom of the receiving groove has a first distance from the bottom of the receiving groove, and the side of the protrusion facing away from the bottom of the receiving groove has a second distance from the bottom of the receiving groove, wherein the first distance is greater than the second distance.
[0011] In one embodiment, the difference between the first distance and the second distance is between 0.2 mm and 0.6 mm.
[0012] In one embodiment, in the radial direction of the air hole, the orthographic projection area of the side of the boss facing the air hole on the bottom of the receiving groove is S, and the ratio of the orthographic projection area S to the cross-sectional area of the air hole is between 4 and 9.
[0013] In one embodiment, the boss includes a connecting section and a main body section in the axial direction of the air hole. The connecting section connects the bottom of the receiving groove and the main body section. In the radial direction of the air hole, the connecting section has a guide arc surface on the side facing the air hole.
[0014] In one embodiment, the pressure sensor further includes two lugs, which are respectively connected to opposite sides of the housing. Each lug has a mounting hole for inserting a fastener to fix the pressure sensor on the mounting part.
[0015] In one embodiment, the receiving groove is located between the two mounting holes.
[0016] Secondly, embodiments of the present invention provide a battery pack, comprising:
[0017] A housing having a space to be measured, the housing including the mounting portion, the mounting portion having the through hole communicating with the space to be measured; and...
[0018] The pressure sensor as described in any of the preceding items is located inside the housing.
[0019] The beneficial effects of the embodiments of this utility model are as follows:
[0020] In an embodiment of this invention, the side of the protrusion facing away from the mounting cavity abuts against the mounting portion of the battery pack. At least a portion of the protrusion is arranged around the outer periphery of the receiving groove, preventing the foam adhesive from flowing into the receiving groove, thereby preventing the foam adhesive from flowing into the vent at the bottom of the receiving groove. The elastic seal is provided in the receiving groove, which not only absorbs vibration or impact, reducing the influence of these external factors on the air pressure sensor and improving its stability and reliability, but also plays a role in physical isolation. Even if a small amount of foam adhesive crosses the protrusion and enters the receiving groove, it will be blocked by the elastic seal and cannot further reach the location of the vent, thus keeping the gas flow path unobstructed. The sensing element communicates with the space to be measured in sequence through the vent, the opening of the elastic seal, and the through hole of the mounting portion, resulting in accurate and reliable detection results. That is, in an embodiment of this invention, by setting the protrusion and introducing the elastic seal, the sealing between the air pressure sensor and the battery pack mounting portion can be enhanced, preventing the foam adhesive from reaching the location of the vent, thereby improving the technical problem of vent blockage caused by foam adhesive overflow. Attached Figure Description
[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.
[0022] Figure 1 This is a three-dimensional schematic diagram of the air pressure sensor provided in an embodiment of this utility model;
[0023] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the image;
[0024] Figure 3 yes Figure 1 A front view of the pressure sensor in the diagram;
[0025] Figure 4 yes Figure 3 Sectional view at BB in the middle;
[0026] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the barometric pressure sensor from another perspective;
[0027] Figure 6 yes Figure 1 Side view of the barometric pressure sensor.
[0028] Explanation of reference numerals in the attached figures:
[0029] 100. Pressure sensor; 1. Housing; 11. Protrusion; 12. Receiving groove; 121. Air hole; 122. Boss; 1221. Main body section; 1222. Connecting section; 12221. Guide arc surface; 2. Sensing element; 3. Elastic seal; 31. Opening; 4. Lug; 41. Mounting hole. Detailed Implementation
[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.
[0031] This application proposes a barometric pressure sensor. Figures 1 to 6 These are some embodiments of this application.
[0032] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments of this application, a pressure sensor 100 is used in a battery pack. The pressure sensor 100 includes a housing 1, a sensing element 2, and an elastic seal 3 (in the figures, the elastic seal 3 is in an uncompressed state). The housing 1 has a mounting cavity. The side of the housing 1 away from the mounting cavity has a protrusion 11 and a receiving groove 12. At least a portion of the protrusion 11 is arranged around the outer periphery of the receiving groove 12. The side of the protrusion 11 away from the mounting cavity is used to abut against the mounting part of the battery pack. The bottom of the receiving groove 12 has an air hole 121 communicating with the mounting cavity. The sensing element 2 is disposed in the mounting cavity. The elastic seal 3 is disposed in the receiving groove 12 and is used to abut against the mounting part. The elastic seal 3 has an opening 31 communicating with the air hole 121. The opening 31 is used to communicate with the through hole of the mounting part.
[0033] In the technical solution of this application, see Figure 2 and Figure 4 The protrusion 11, facing away from the mounting cavity, abuts against the mounting portion of the battery pack. At least a portion of the protrusion 11 is arranged around the outer periphery of the receiving groove 12, blocking the flow of foam into the receiving groove 12, thereby preventing the foam from flowing into the vent 121 located at the bottom of the receiving groove 12. The elastic seal 3 is disposed in the receiving groove 12, which not only absorbs vibration or impact, reducing the influence of these external factors on the air pressure sensor 100 and improving its stability and reliability, but also plays a role in physical isolation. Even if a small amount of foam crosses the protrusion 11 and enters the receiving groove 12, it will be blocked by the elastic seal 3 and cannot further reach the location of the vent 121, thereby keeping the gas flow path unobstructed. The sensing element 2 communicates with the space to be measured through the vent 121, the opening 31 of the elastic seal 3, and the through hole of the mounting portion in sequence, so that the detection result is accurate and reliable. That is, in the embodiments of this utility model, by providing the protrusion 11 and introducing the elastic sealing member 3, the sealing between the air pressure sensor 100 and the battery pack mounting part can be enhanced, preventing the foam from reaching the location of the vent 121, thereby improving the technical problem of the vent 121 being blocked due to the overflow of the foam.
[0034] This application does not limit the material of the elastic seal 3. Any material with good compression resilience, certain sealing and buffering capacity is acceptable. For example, the elastic seal 3 can be EPS (expanded polystyrene), EPP (expanded polypropylene), EVA (ethylene-vinyl acetate copolymer) foam, or PU (polyurethane) foam, etc.
[0035] In some embodiments of this application, the elastic seal 3 is made of foam. Foam has good elasticity and compression resilience, enabling it to provide cushioning and sealing functions. For example, if the initial thickness of the foam is 6mm and it is compressed to about 3mm, it can provide a good seal between the pressure sensor 100 and the mounting part. Foam is easy to cut and shape, and its size and shape can be customized according to specific needs. Furthermore, its lightweight nature makes the installation process simpler and faster, reducing assembly time and costs. Compared to certain special materials, foam is less expensive, and it is widely available on the market, making it easy to purchase. Therefore, choosing foam as the elastic seal 3 can reduce production costs and improve production efficiency while ensuring its sealing and cushioning performance.
[0036] In some embodiments of this application, see Figure 4 , the height of the convex portion 11 ( Figure 4 (a) The height of the protrusion 11 is between 0.1mm and 0.3mm. Understandably, if the height of the protrusion 11 is too low, it will not be able to effectively prevent the foam adhesive from flowing into the receiving groove 12. Furthermore, during production, if the height of the protrusion 11 is designed to be too low, manufacturing tolerances may result in the protrusion 11 being almost non-existent or having unstable effects in the actual product, affecting the consistency of product quality. On the other hand, an excessively high protrusion 11 will generate significant local pressure at the contact point, potentially leading to material deformation or even damage. This problem is particularly pronounced when the mounting surface is not flat. Additionally, an excessively high protrusion 11 may prevent the pressure sensor 100 from properly fitting the mounting surface, especially if the mounting surface itself is slightly uneven. In summary, setting the height of the protrusion 11 between 0.1mm and 0.3mm ensures that the pressure sensor 100 can be securely attached to the mounting surface without causing other problems due to design flaws. The height of the protrusion 11 can be 0.1mm, 0.15mm, 0.2mm, 0.25mm or 0.3mm, etc., and this application does not limit it in any specific way.
[0037] In some embodiments of this application, see Figure 2 and Figure 4The bottom of the receiving groove 12 is also provided with a boss 122, which surrounds the outer periphery of the vent 121. The boss 122 is located inside the opening 31 and abuts against the inner wall of the opening 31. In these embodiments, by placing the boss 122 around the vent 121 and placing it inside the opening 31 of the elastic seal 3, it is possible to prevent the elastic seal 3 from extending to the vent 121 and blocking it when the elastic seal 3 is compressed. This maintains the unobstructed gas flow path and ensures that pressure changes can be transmitted to the sensing element 2 without interference, thus guaranteeing the quality and stability of signal transmission. Even if a small amount of foam enters the receiving groove 12 by crossing the protrusion 11, or even penetrates from the elastic seal 3, the boss 122 can prevent it from further reaching the vent 121, thereby providing an additional physical barrier for the vent 121 and preventing the foam from entering the vent 121. In addition, the presence of the boss 122 provides a clear positioning for the elastic seal 3, making the installation process simpler and more accurate, reducing the possibility of assembly errors. During the assembly process, the boss 122 can serve as a visual and tactile guide, helping operators to quickly and correctly install the elastic seal 3, thereby improving production efficiency.
[0038] In some embodiments of this application, see Figure 4 The side of the protrusion 11 facing away from the bottom of the receiving groove 12 has a first distance from the bottom of the receiving groove 12 (see...). Figure 4 (b) In this context, the side of the boss 122 facing away from the bottom of the receiving groove 12 has a second distance from the bottom of the receiving groove 12 (see [reference]). Figure 4 In these embodiments, the larger first distance of the protrusion 11 allows it to preferentially contact the mounting portion and form a preliminary seal after the elastic seal 3 is compressed. Even with slight assembly errors or surface unevenness, the protrusion 11 can still reliably abut against the mounting portion, ensuring that the foam adhesive is blocked from entering the receiving groove 12 from the source. This improves the reliability of the seal between the protrusion 11 and the mounting portion, increases the fault tolerance of the assembly, and simplifies the installation process. The smaller second distance means that the protrusion 122 will not contact the mounting portion before the elastic seal 3 is fully compressed, avoiding the premature application of unnecessary pressure. This ensures that the elastic seal 3 can complete its compression process without interference, achieving more effective compression and thus guaranteeing a better sealing effect.
[0039] In some embodiments of this application, see Figure 4 First distance (see) Figure 4 (b) and the second distance (see Figure 4The difference between the first distance and the second distance (i.e., the height of the boss 122) is between 0.2mm and 0.6mm. Understandably, if the difference between the first distance and the second distance is too small, manufacturing tolerances may result in almost no difference in the actual product, failing to ensure a tight fit between the protrusion 11 and the mounting portion, and preventing the boss 122 from interfering with the compression process of the elastic seal 3. If the difference between the first distance and the second distance is too large, the height of the boss 122 will become relatively small, which may weaken its limiting effect on the elastic seal 3. In these embodiments, the difference between the first distance and the second distance is between 0.2mm and 0.6mm, ensuring that even with certain dimensional deviations in the actual production process, the functions of the protrusion 11 and the boss 122 are guaranteed, ensuring a tight fit between the protrusion 11 and the mounting portion, and preventing the boss 122 from interfering with the compression process of the elastic seal 3.
[0040] In some embodiments of this application, the radially projected area of the boss 122 facing the air hole 121 on the bottom of the receiving groove 12 is S, and the ratio of the projected area S to the cross-sectional area of the air hole 121 is between 4 and 9. In this embodiment, the projected area of the boss 122 facing the air hole 121 on the bottom of the receiving groove 12 is S, and the ratio of the projected area S to the cross-sectional area of the air hole 121 is between 4 and 9. That is, the cross-sectional area of the channel defined by the boss 122 is larger than the cross-sectional area of the air hole 121, and their ratio is between 4 and 9. By ensuring that the cross-sectional area of the channel defined by the boss 122 is larger than the cross-sectional area of the air hole 121 and maintaining the ratio between 4 and 9, the influence of channel narrowing on air pressure can be effectively avoided. The larger channel area reduces the resistance during gas flow, ensuring that changes in air pressure can be accurately transmitted to the sensing element 2, thereby improving the accuracy of detection. Furthermore, a larger channel area facilitates connection with the through-hole of the mounting part, ensuring the continuity and smoothness of the gas flow path, helping to maintain stable airflow, reducing measurement errors caused by poor airflow or turbulence, and further improving the working performance of the pressure sensor 100. When the vent 121 is a circular hole, and the cross-section of the channel defined by the boss 122 is circular, the ratio of the channel diameter to the vent 121 diameter can be 2, making the ratio of the projected area S to the cross-sectional area of the vent 121 4. The ratio of the channel diameter to the vent 121 diameter can also be 3, making the ratio of the projected area S to the cross-sectional area of the vent 121 9. Of course, the ratio of the channel diameter to the vent 121 diameter can also be other ratios, and the vent 121 and the channel can also be other shapes. Specifically, this application does not limit this.
[0041] In some embodiments of this application, see Figure 2In the axial direction of the vent 121, the boss 122 includes a connecting section 1222 and a main body section 1221. The connecting section 1222 connects the bottom of the receiving groove 12 and the main body section 1221. In the radial direction of the vent 121, the connecting section 1222 has a guide arc surface 12221 on the side facing the vent 121. In these embodiments, the connecting section 1222, located between the bottom of the receiving groove 12 and the main body section 1221, provides a transition area in the gas flow path. The design of the guide arc surface 12221 allows the gas to smoothly transition to the main body section 1221 when passing through the connecting section 1222, reducing turbulence and resistance, and ensuring the stability and continuity of the airflow. This helps improve the measurement accuracy of the pressure sensor 100 and avoids errors caused by poor airflow.
[0042] In some embodiments of this application, see Figure 1 The pressure sensor 100 also includes two lugs 4, which are respectively connected to opposite sides of the housing 1. Each lug 4 has a mounting hole 41 for inserting a fastener to fix the pressure sensor 100 to the mounting part. In these embodiments, by providing two lugs 4 on opposite sides of the housing 1 and fixing them with fasteners (such as screws or bolts), a two-point fixation of the pressure sensor 100 can be achieved. This design provides a more reliable connection and reduces the risk of loosening of the pressure sensor 100 under vibration or impact, ensuring its long-term reliable operation. The mounting holes 41 on the lugs 4 make the installation and disassembly process simpler and faster, reducing complex assembly steps and improving production efficiency. At the same time, it also facilitates quick disassembly when maintenance or replacement is required. The use of fasteners not only achieves mechanical fixation, but also helps the elastic seal 3 to better fit the mounting part through appropriate pressure, further enhancing the sealing effect.
[0043] In some embodiments of this application, the receiving groove 12 is located between two mounting holes 41. In these embodiments, the elastic seal 3 is disposed in the receiving groove 12, and fasteners pass through the mounting holes 41. The receiving groove 12 is located between the two mounting holes 41, that is, the elastic seal 3 is located between the two fasteners. This ensures that the elastic seal 3 is in a central position and receives uniform pressure from both sides. This ensures that the elastic seal 3 is subjected to more uniform force throughout the compression process, avoiding local over-compression or stress concentration, thereby improving the sealing effect and durability. It also helps to maintain a tight fit between the elastic seal 3 and the mounting part, enhancing the overall sealing reliability. In addition, the elastic seal 3 is stable in position, maintaining its correct position relative to the vent 121 and the through hole. This ensures the continuity and stability of the gas flow path, ensuring accurate and reliable detection results.
[0044] This application also proposes a battery pack, which includes a housing and a pressure sensor 100. The housing has a space to be measured and includes a mounting part with a through hole communicating with the space to be measured. The pressure sensor 100 is disposed in the housing, and the structure of the pressure sensor 100 is as described above. Since this battery pack adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. The mounting part can be a partition, beam, or bracket in the battery pack. One side of the mounting part is used to install the pressure sensor 100, and the other side of the mounting part corresponds to the space to be measured. The mounting part has a through hole that passes through both sides, so that the sensing element 2 communicates with the space to be measured through the air hole 121, the opening 31 of the elastic seal 3, and the through hole of the mounting part in sequence, thereby realizing the detection of the air pressure in the space to be measured.
[0045] This application also proposes an electrical device, which includes a battery pack, the structure of which is as described above. Since this electrical device employs all the technical solutions of the above embodiments, it at least possesses the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here. The electrical device includes, but is not limited to, vehicles, energy storage power supplies, consumer electronics, medical devices, and smart cities.
[0046] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.
Claims
1. A gas pressure sensor for a battery pack, characterized by, The gas pressure sensor comprises: a housing provided with a mounting cavity, wherein one side of the housing away from the mounting cavity is provided with a protrusion and a receiving groove, at least part of the protrusion is arranged around the outer periphery of the receiving groove, and the side of the protrusion away from the mounting cavity is used to abut against a mounting portion of a battery pack, and the groove bottom of the receiving groove is provided with an air hole in communication with the mounting cavity; a sensing element arranged in the mounting cavity; and an elastic sealing element arranged in the receiving groove and used to abut against the mounting portion, wherein the elastic sealing element is provided with an opening in communication with the air hole, and the opening is used to communicate with a through hole of the mounting portion.
2. The pressure sensor according to claim 1, wherein The height of the protrusion is between 0.1 mm and 0.3 mm.
3. The pressure sensor of claim 1, wherein, The groove bottom of the receiving groove is further provided with a boss, the boss is arranged around the outer periphery of the air hole, the boss is located in the opening, and the boss abuts against the inner wall of the opening.
4. The pressure sensor of claim 3, wherein, The side of the protrusion away from the groove bottom of the receiving groove and the groove bottom of the receiving groove have a first distance, the side of the boss away from the groove bottom of the receiving groove and the groove bottom of the receiving groove have a second distance, and the first distance is greater than the second distance.
5. The pressure sensor of claim 4, wherein, The difference between the first distance and the second distance is between 0.2 mm and 0.6 mm.
6. The pressure sensor of claim 3, wherein, In the radial direction of the air hole, the side of the boss toward the air hole has a projection area S on the groove bottom of the receiving groove, and the ratio of the projection area S to the cross-sectional area of the air hole is between 4 and 9.
7. The pressure sensor of claim 3, wherein, In the axial direction of the air hole, the boss comprises a connecting segment and a main body segment, the connecting segment is connected between the groove bottom of the receiving groove and the main body segment, and in the radial direction of the air hole, the side of the connecting segment toward the air hole has a guide arc surface.
8. The pressure sensor according to any one of claims 1 to 7, wherein The gas pressure sensor further comprises two lugs, the two lugs are respectively connected to opposite sides of the housing, each of the lugs is provided with a mounting hole, the mounting hole is used to pass a fastener to fix the gas pressure sensor on the mounting portion.
9. The pressure sensor of claim 8, wherein, The receiving groove is located between the two mounting holes.
10. A battery pack, characterized by, The gas pressure sensor comprises: a box body having a to-be-measured space, wherein the box body comprises the mounting portion, and the mounting portion is provided with the through hole in communication with the to-be-measured space; and the gas pressure sensor according to any one of claims 1-9 is arranged in the box body.