Battery pack cover structure and battery pack

Abstract

The application discloses a battery pack cover structure and a battery pack. The battery pack cover structure comprises a cover body formed by one-step stamping, which has a first surface facing away from the battery pack and a second surface facing the battery pack. The first surface is provided with first and second flow guide grooves extending in the length and width directions and staggeredly connected, thereby dividing a plurality of independent protruding areas. The end of the flow guide groove is provided with a broken area. The edge of the cover body is circumferentially provided with a locking edge recessed from the first surface to the second surface, which is lower than the flow guide groove, and at least part of the position corresponding to the broken area is communicated with the flow guide groove to form a liquid discharge port. The structure changes the vibration characteristics, avoids excessive overall amplitude and resonance caused by a single long strip in one direction, enhances the rigidity, reduces the risk of fatigue damage, reduces the wear and impact on precision components, and ensures the safety of the battery pack. At the same time, rainwater and other liquids cannot accumulate in the groove and can be quickly discharged through the liquid discharge port, thereby avoiding long-term liquid accumulation to accelerate material corrosion and reducing the risk of leakage and corrosion perforation.

Description

Technical Field

[0001] This invention relates to the field of battery pack technology, and in particular to a battery pack cover structure and a battery pack. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the safety and reliability of the power battery pack, as a core component, are of paramount importance. The battery pack cover, as a key structural component, not only serves a sealing and protective function but also needs to withstand complex operating conditions, including vehicle vibration, external liquid splashes, and the potential thermal runaway risk from the internal battery cells.

[0003] Currently, traditional battery pack covers typically employ a simple flat, reinforced structure to enhance rigidity. For example, this is achieved by incorporating crisscrossing reinforcing ribs on the cover to improve structural strength. However, such designs generally suffer from the following technical drawbacks: 1. Structural strength and vibration issues: Many existing designs use through-type long ribs. When this structure is subjected to external vibration, it is prone to large overall amplitude and resonance, resulting in insufficient rigidity of the cover. Long-term use may cause fatigue damage, and even cause wear or impact on precision components such as battery modules, busbars, and FPCs at the bottom of the cover, endangering the safety of the battery pack.

[0004] 2. Risk of Liquid Accumulation and Corrosion: An improperly designed surface structure of the trunk lid can easily lead to the accumulation of rainwater, car wash water, and other liquids within the reinforcing rib grooves, preventing rapid drainage. Prolonged liquid accumulation accelerates the corrosion of the trunk lid material, especially in areas prone to liquid buildup such as the intersections or ends of the reinforcing ribs, posing a risk of leakage and perforation. Summary of the Invention

[0005] The purpose of this invention is to disclose a battery pack cover structure that overcomes the structural strength and vibration problems, as well as the risks of liquid accumulation and corrosion, of traditional battery pack covers, thereby improving the overall safety and reliability of the battery pack.

[0006] To achieve the above objectives, the present invention discloses a battery pack cover structure, comprising a cover body integrally stamped, the cover body including a first side facing away from the battery pack and a second side facing the battery pack; the first side is provided with multiple first and second guide grooves recessed from the first side to the second side, the first guide grooves extending along the length direction of the cover body, the second guide grooves extending along the width direction of the cover body, the first guide grooves and the second guide grooves being staggered to form multiple independent protruding areas; the ends of the first guide grooves and / or the second guide grooves are provided with interrupted areas; the edge of the cover body is provided with a locking edge circumferentially, the locking edge being recessed from the first side to the second side, the height of the locking edge being lower than the first and second guide grooves; at least part of the locking edge corresponding to the position of the interrupted area communicates with the first guide groove and / or the second guide groove to form a drain port.

[0007] By adopting the above solution, compared with the traditional through-type long strip ribs, the vibration characteristics of the structure are changed, avoiding the problem of excessive overall amplitude and resonance caused by long strip ribs in one direction, enhancing the rigidity of the cover and reducing the risk of fatigue damage under long-term use. Due to the enhanced rigidity and improved vibration, the wear or impact on precision components such as the bottom battery module, busbar, and flexible circuit board (FPC) will be reduced when the cover body is subjected to external vibration excitation, thereby ensuring the safety of the battery pack. The ends of the first guide channel and / or the second guide channel are provided with interrupted areas. The design of the cover body prevents rainwater, car wash water and other liquids from accumulating in the grooves formed by the ribs. They can be quickly discharged through the drain port, avoiding the situation where long-term liquid accumulation accelerates the corrosion of the cover material, and reducing the risk of leakage and corrosion perforation in areas such as the intersection of reinforcing ribs or the ends.

[0008] Furthermore, the interrupted area includes an arc-shaped portion connecting the ends of adjacent first guide channels, the drain outlet is located at the outer edge of the arc-shaped portion, and the projection position of the drain outlet on the locking edge corresponds to at least one bolt fixing point.

[0009] By adopting the above scheme, the arc-shaped part connecting the ends of adjacent first guide channels can smoothly transition the structure, reduce stress concentration, and enhance the structural strength and stability of the cover. The drain port is located on the outer edge of the arc-shaped part, which can efficiently guide the liquid out and avoid liquid accumulation and corrosion. Moreover, the projection of the drain port on the locking edge corresponds to at least one bolt fixing point. The bolt fixing point not only enhances the structural strength around the drain port and prevents deformation and damage caused by force during drainage, but also facilitates the inspection and cleaning of the drain port through the bolt fixing point during installation and maintenance, ensuring the long-term effectiveness of the drainage function, thereby improving the overall safety and reliability of the battery pack.

[0010] Furthermore, the interrupted area includes a bent portion disposed at the end of the first guide channel and / or the end of the second guide channel, and the drain outlet is disposed at one end of the bent portion facing the locking edge, and the drain outlet corresponds to at least one bolt fixing point of the locking edge.

[0011] By adopting the above solution, the bending section effectively alters the stress distribution of the battery pack cover structure, reduces the risk of resonance caused by structural continuity during vibration, and enhances overall rigidity. The drain outlet is located at the end of the bending section facing the locking edge, guiding the liquid to flow smoothly towards the locking edge and draining quickly, preventing liquid accumulation and corrosion. Furthermore, the drain outlet has at least one bolt fixing point corresponding to the locking edge, which not only strengthens the surrounding structure of the drain outlet through bolt fixing, preventing damage from external forces, but also facilitates inspection and cleaning of the drain outlet through the fixing point during installation and maintenance, ensuring the long-term stable and safe operation of the battery pack.

[0012] Furthermore, the interrupted area includes a recessed portion disposed on one side of the first guide channel, the width of the first guide channel corresponding to the recessed portion is smaller than the width of other areas of the first guide channel, and the recessed portion is used to correspond to the electrical components inside the battery pack.

[0013] By adopting the above solution, on the one hand, the recessed part can cleverly avoid the electrical components inside the battery pack, leaving them with sufficient installation and operation space, avoiding interference or compression of the electrical components by the cover structure, and ensuring the normal operation of the electrical components; on the other hand, while meeting the avoidance requirements, it can correspond to the structural partitions inside the battery pack, realize regional isolation, and reduce the spread range of thermal runaway.

[0014] Furthermore, the middle area of ​​the cover body is provided with a middle reinforcing rib extending along the length direction of the cover body. The middle reinforcing rib protrudes from the second surface to the first surface, so that the second surface forms a clearance space to avoid the connection row inside the battery pack.

[0015] By adopting the above solution, the structural strength of the middle part of the cover is enhanced, improving the overall resistance to deformation and enabling it to better cope with complex operating conditions such as vehicle vibration. At the same time, the middle reinforcing rib creates a clearance space on the second side, cleverly avoiding the connecting strips inside the battery pack. This prevents the cover and the connecting strips from interfering with or squeezing each other, ensuring stable connection and normal operation of the connecting strips, thereby improving the safety and reliability of the battery pack and extending its service life.

[0016] Furthermore, a third flow channel is formed on both sides of the intermediate reinforcing rib, and the width of the third flow channel is smaller than the width of the first flow channel; a first support strip and a second support strip are provided on the second surface, the first support strip is aligned with the first flow channel along the thickness direction of the box cover body, and the second support strip is aligned with the third flow channel along the thickness direction of the box cover body, and the width of the second support strip is smaller than the width of the first support strip.

[0017] By adopting the above solution, third flow channels with a width smaller than the first flow channel are set on both sides of the middle reinforcing rib. This not only further optimizes the liquid flow path on the surface of the battery pack cover, making drainage more efficient and preventing liquid accumulation, but also works in conjunction with the middle reinforcing rib to enhance structural strength. Simultaneously, the second side is equipped with a first support strip directly opposite the first flow channel and a second support strip with a smaller width directly opposite the third flow channel. This provides targeted support at different locations, ensuring overall structural rigidity while rationally distributing support force to adapt to the stress requirements of different flow channel areas. It also reduces the amount of sealing strip used below the middle reinforcing rib, improving the overall performance and reliability of the battery pack.

[0018] Furthermore, the first surface is provided with at least one island-shaped groove, the island-shaped groove is located between the first guide channel and the locking edge in the length direction of the box cover body, the drain outlet is provided between the island-shaped groove and the locking edge, and the drain outlet corresponds to at least one bolt fixing point of the locking edge, and the area of ​​the second surface facing the island-shaped groove is provided with a third support strip.

[0019] By adopting the above solution, an island-shaped groove is provided on the first side between the first guide channel and the locking edge along the length of the cover body. This optimizes the liquid flow direction, guiding the liquid to converge towards the drain port, and efficiently discharging the liquid to avoid liquid accumulation and corrosion. The drain port has at least one bolt fixing point corresponding to the locking edge, which strengthens the surrounding structure of the drain port and facilitates inspection and cleaning. Simultaneously, a third support strip is provided on the second side opposite the island-shaped groove, enhancing the structural strength of this area, resisting external pressure and vibration, ensuring the overall stability of the cover, and improving the safety and reliability of the battery pack.

[0020] Furthermore, the edge of the protruding area is formed with a guide surface that slopes inward toward the inside of the battery pack, the slope angle of the guide surface being 15°-45°, for guiding the flow of thermal runaway gas.

[0021] By adopting the above solution, when thermal runaway occurs in the battery cells within the battery pack, a large amount of high-temperature, high-pressure gas is generated. This guiding surface can effectively guide this thermal runaway gas to flow in a predetermined direction, preventing the gas from accumulating locally under the cover and forming a high-pressure area. This reduces the risk of serious safety accidents such as explosions and fires caused by the gas breaking through the cover and other structures, greatly improving the safety of the battery pack. From a structural design perspective, the 15°-45° tilt angle ensures good gas guidance without affecting the overall structural strength and stability of the cover due to excessively large or small angles. While ensuring safety functions, it also takes into account the rationality and reliability of the structure, which is conducive to the long-term stable operation of the battery pack under complex operating conditions.

[0022] A battery pack includes: a housing frame; multiple battery modules disposed within the housing frame; a battery pack cover structure, the cover body being bolted to the housing frame via locking edges; wherein multiple protruding areas project along the thickness direction of the cover body to cover the cell explosion-proof valve on each battery module, and the side of the protruding area facing the battery module forms multiple spaced thermal runaway venting channels between the protruding areas and the battery modules; at least one support strip is disposed between the second side and the battery modules, and cooperates with the first guide groove and / or the second guide groove to isolate adjacent thermal runaway venting channels.

[0023] By adopting the above solution, the cover body is bolted to the box frame via locking edges, ensuring stability and reliability. The projected area covers the cell explosion-proof valve, which can accurately catch ejected materials in the event of cell thermal runaway. Furthermore, the multiple spaced thermal runaway exhaust channels formed between the cover and the battery module can guide the thermal runaway gas out in an orderly manner, avoiding secondary damage caused by disordered gas impact. At the same time, the support strip set between the second side and the battery module effectively isolates adjacent exhaust channels, preventing gas interference and further ensuring the safety and stability of the battery pack under thermal runaway conditions, thus extending the service life of the battery pack.

[0024] Furthermore, it also includes a bending portion, at least one of the bending portions having its projection along the thickness direction of the cover body located within the area of ​​the electrical compartment of the battery pack, thereby preventing gas from directly entering the electrical compartment in the event of thermal runaway; and / or, it also includes a recessed portion, two of the recessed portions having their regions formed by being disposed opposite each other along the width direction of the cover body, the projection of which along the thickness direction of the cover body covers an electrical component within the area of ​​the electrical compartment of the battery pack.

[0025] By adopting the above-mentioned scheme, setting the bending part and positioning its projection in the electrical compartment area of ​​the battery pack, it can effectively prevent high-temperature and high-pressure gas from directly rushing into the electrical compartment during thermal runaway, avoiding damage to the precision electrical components inside the electrical compartment and ensuring the normal operation of the electrical system. Meanwhile, the two oppositely set concave parts form an area covering the electrical components inside the electrical compartment, which not only cleverly leaves space for the installation and operation of the electrical components and prevents the cover structure from interfering with them, but also uses the concave structure to form a protective barrier for the electrical components to a certain extent, reducing the impact of external factors on the electrical components. The two work together to improve the safety and reliability of the battery pack under extreme conditions such as thermal runaway.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Compared with the traditional through-type long strip rib, the cover structure is divided into multiple independent protruding areas by the staggered connection of the first and second guide grooves. This changes the vibration characteristics of the structure, avoids the problem of excessive overall amplitude and resonance caused by long strip rib in one direction, enhances the rigidity of the cover, reduces the risk of fatigue damage caused by vibration under long-term use, extends the service life of the cover, and improves the overall reliability of the battery pack. 2. Due to the increased rigidity of the cover and the improvement of vibration issues, the wear or impact on precision components such as the bottom battery module, busbar, and FPC (flexible printed circuit board) is reduced when subjected to external vibration excitation, effectively ensuring the normal operation of these precision components inside the battery pack, thereby ensuring the safety performance of the battery pack. 3. The ends of the first guide channel and / or the second guide channel are provided with a break area, and the circumferential locking edge of the cover body is connected to the guide channel to form a drain port, so that rainwater, car wash water and other liquids will not accumulate in the groove formed by the ribs and can be quickly discharged through the drain port. 4. It avoids the situation where long-term liquid accumulation accelerates the corrosion of the cover material, reduces the risk of leakage and corrosion perforation in areas such as the intersection of reinforcing ribs or the ends, helps to maintain the stability of the internal environment of the battery pack, and improves the service life and safety of the battery pack. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the first side structure of the box cover body according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the second side structure of the box cover body according to an embodiment of the present invention; Figure 3 for Figure 2 Cross-sectional view at point AA; Figure 4 This is a schematic diagram of the separation structure of the battery pack and the case cover body according to an embodiment of the present invention; Figure 5 for Figure 1 Enlarged view of area B in the middle; Figure 6 for Figure 1 Enlarged view of area C.

[0029] Explanation of key figure labels: 1. Box cover body; 11. First surface; 111. First guide channel; 112. Second guide channel; 113. Third guide channel; 114. Protruding area; 1141. Guide surface; 12. Second surface; 2. Locking edge; 21. Drain outlet; 22. Bolt fixing point; 3. Interruption area; 31. Arc-shaped part; 32. Concave part; 33. Bending part; 4. Intermediate reinforcing rib; 41. Clearance space; 5. First support bar; 6. Second support bar; 7. Third support bar; 8. Island-shaped groove; 9. Box frame; 10. Battery module; 101. Cell explosion-proof valve; 102. FPC fuse; 20. Thermal runaway exhaust channel; 30. Electrical compartment. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0032] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0033] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0034] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0035] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0036] Please refer to Embodiment 1 of the present invention. Figures 1 to 6 As shown, a battery pack cover structure is provided, including a cover body 1 integrally stamped. The cover body 1 has a first side 11 facing away from the battery pack and a second side 12 facing the battery pack. On the first side 11, there are multiple first guide grooves 111 and second guide grooves 112 recessed from the first side 11 to the second side 12. The first guide grooves 111 extend along the length direction of the cover body 1, and the second guide grooves 112 extend along the width direction of the cover body 1. The first guide grooves 111 and the second guide grooves 112 are staggered to form multiple independent protruding areas 114. The protruding areas 114 are transitioned to the first guide grooves 111 or the second guide grooves 112 by an arc-shaped surface. This arc-shaped surface facilitates the guidance of liquid into the first guide grooves 111 or the second guide grooves, while significantly avoiding stress concentration and improving the durability of the cover body 1.

[0037] In some embodiments, the first guide channel 111 and / or the second guide channel 112 are provided with a non-through interruption region 3. The interruption region 3 is divided into multiple forms, and each form can exist independently or simultaneously.

[0038] The lid body 1 has a locking edge 2 circumferentially oriented around its edge. The locking edge 2 is recessed from the first surface 11 to the second surface 12, and the height of the locking edge 2 in the thickness direction of the lid body 1 is lower than that of the first guide groove 111 and the second guide groove 112. At least part of the locking edge 2, corresponding to the position of the interrupted area 3, communicates with the first guide groove 111 and / or the second guide groove 112 to form a drain port 21, such that the height of the drain port 21 is greater than the height of the locking edge 2, ensuring that the liquid can be smoothly discharged from the lid surface.

[0039] Specifically, in one scenario, the interrupted area 3 is in the form of an arc-shaped portion: the interrupted area 3 includes an arc-shaped portion 31 connecting the ends of adjacent first guide channels 111. The arc-shaped portion 31 can be U-shaped, semi-circular, or semi-elliptical, etc. The design of the arc-shaped portion 31 can smoothly transition the structure, reduce stress concentration, and enhance the strength and stability of the cover structure. The drain port 21 is located at the outer edge of the arc-shaped portion 31, and the projection position of the drain port 21 on the locking edge 2 corresponds to at least one bolt fixing point 22. The drain port 21 can extend from one adjacent first guide channel 111 to another first guide channel 111, which can increase the width of the drain port 21, so that the liquid can be discharged through the drain port 21 efficiently, avoiding accumulation on the surface of the cover and causing corrosion. Specifically, when the first guide channel 111 extends along the length of the cover body 11, the corresponding drain port 21 of the adjacent first guide channel 111 extends along the width of the cover body 11, thereby increasing the width of the drain port 21 in the width direction of the cover body 11. At the same time, the drain port 21 is a weak point in strength due to material deficiency, and the scouring force when the liquid is discharged, the vibration load during vehicle operation, and the air pressure impact during battery thermal runaway will all act on this area. By using the bolt fixing point 22 to rigidly connect the locking edge 2 to the box frame 9, the stress of the drain port 21 is transferred to the box frame 9, dispersing the stress and preventing cracking and deformation of the drain port 21 edge due to local stress concentration. It also facilitates the inspection and cleaning of the drain port 21 through the bolt fixing point 22 during installation and maintenance, ensuring the long-term effectiveness of the drain function.

[0040] Specifically, in one scenario, the interrupted area 3 is in the form of a bent section: the interrupted area 3 includes a bent section 33 located at the end of the first guide channel 111 and / or the end of the second guide channel 112. The bent section 33 can effectively change the stress distribution of the cover structure, reduce the risk of resonance caused by structural continuity during vibration, and enhance the overall rigidity. The drain port 21 is located at the end of the bent section 33 facing the locking edge 2, and the drain port 21 corresponds to at least one bolt fixing point 22 of the locking edge 2. This design can guide the liquid to flow smoothly towards the locking edge 2 and discharge quickly, avoiding liquid accumulation and corrosion. At the same time, the bolt fixing strengthens the surrounding structure of the drain port 21, preventing it from being damaged by external forces, and facilitating the inspection and cleaning of the drain port 21 through the fixing point during installation and maintenance, ensuring the long-term stable and safe operation of the battery pack.

[0041] Specifically, in one scenario, the interruption area 3 is in the form of a concave portion: the interruption area 3 includes a concave portion 32 disposed on one side of the first guide channel 111, the width of the first guide channel 111 corresponding to the concave portion 32 is smaller than the width of other areas of the first guide channel 111. The concave portion 32 is used to correspond to electrical components inside the battery pack, such as electrical components inside the electrical compartment 30. On the one hand, it can cleverly avoid the electrical components inside the electrical compartment 30 of the battery pack, leaving sufficient space for their installation and operation, avoiding interference or compression of the electrical components by the cover structure, and ensuring the normal operation of the electrical components; on the other hand, while meeting the avoidance requirements, it can correspond to the structural partitions inside the battery pack, realize regional isolation, and reduce the spread range of thermal runaway.

[0042] In this embodiment 1, the interrupted region 3 is a combination of arc-shaped, bent, and concave forms. For details, please refer to [link / reference needed]. Figure 1 As shown, the arc-shaped portion is located on the short side of the cover body 1 away from the electrical compartment 30, the concave portion is located on the short side of the cover body 1 close to the electrical compartment 30, and the bent portion is located on the long side of the cover body 1, and is distributed on two long sides of the cover body 1. That is, all four sides of the cover body 1 are provided with interrupted areas 3, which fully cover the four sides of the cover body 1 and are differentiated: the arc-shaped portion 31 is located on the short side of the cover body 1 away from the electrical compartment 30, and is smoothly connected to the end of the adjacent first guide groove 111, which not only eliminates the risk of stress concentration at the short side, but also forms an arc-shaped confluence channel extending along the short side, so that the liquid can quickly collect to the drain port 21 through the arc surface, avoiding the formation of liquid accumulation on the short side; the concave portion 32 is located on the cover body 1 close to the electrical compartment 30. The short side of the cover can avoid electrical components such as BDU in the electrical compartment 30. The arc transition section of the recessed edge can guide the liquid to flow to both sides of the short side and finally to the locking edge 2, which protects the electrical components without affecting the drainage. The bending part 33 is located on the two long sides of the cover body 1. The long side is longer. If a single guide channel extends continuously, it is easy to generate resonance due to vibration. The bending part 33 breaks the first guide channel 111 of the long side into segments. Each guide channel can be adjusted in direction through the bending part 33, which can realize segmented guidance, that is, change the stress distribution of the structure and improve the torsional strength of the long side. Each bending part 33 forms a small confluence point. With the drainage port 21 set at intervals on the locking edge 2 of the long side, multi-point drainage can be realized, avoiding the drainage lag caused by the excessively long liquid flow path on the long side. Meanwhile, the design of the interrupted areas 3 on the four sides of the lid body 1 can improve the rigidity of the four edges of the lid body 1 and enhance the overall bending resistance. In addition, with the staggered design of the first guide channel 111 and the second guide channel 112, liquid can be quickly discharged from any area of ​​the lid body 1, avoiding the problem of liquid accumulation.

[0043] It should be noted that in other embodiments, the interrupted region 3 can be a combination of any of the following forms: arc-shaped, bent, and concave. No specific limitation is made here.

[0044] To further enhance the strength of the cover body 1, a central reinforcing rib 4 extending along the length of the cover body 1 is provided in the middle region. The central reinforcing rib 4 protrudes from the second surface 12 towards the first surface 11, forming a clearance space 41 on the second surface 12. This clearance space 41 is used to avoid the connecting strips inside the battery pack. This design enhances the structural strength of the middle part of the cover, improves the overall resistance to deformation, and better copes with complex operating conditions such as vehicle vibration. It also prevents interference and compression between the cover and the connecting strips, ensuring stable connection and normal operation of the connecting strips, thereby improving the safety and reliability of the battery pack and extending its service life. To avoid the connecting strips inside the battery pack being affected by dimensional tolerances and vibrations during actual use, the central reinforcing rib 4 can increase the gap distance between itself and the connecting strips.

[0045] Meanwhile, the presence of the intermediate reinforcing rib 4 naturally forms third flow channels 113 on both sides of the intermediate reinforcing rib 4. The depth of the third flow channels 113 is similar to that of the first flow channels 111 and the second flow channels 112, and the width of the third flow channels 113 is smaller than that of the first flow channels 111. By setting the narrow-width third flow channels 113 on both sides of the intermediate reinforcing rib 4, the connection strength between the intermediate reinforcing rib 4 and the surrounding structure is not weakened due to the channel being too wide. At the same time, the narrow channel design allows the liquid in the third flow channels 113 to form a higher liquid level, using the difference in liquid gravity to increase the flow velocity and avoid the slow flow caused by the liquid level being too low due to the channel width being too wide. It can also work together with the intermediate reinforcing rib 4 to enhance the structural strength. Therefore, this structure also helps to reduce the number of support strips required between the cover body 1 and the battery pack below it, thus reducing costs. In addition, the width of the middle reinforcing rib 4 is also smaller than the width of the protruding area 114. Thus, the narrower middle reinforcing rib 4 makes the projection area of ​​the third guide groove 113 directly face the area above the connecting row, which is convenient for cooperating with the second support bar 6 to press against the connecting row.

[0046] Specifically, the support strip is set on the second surface 12 of the cover body 1. In this embodiment 1, the support strip can also be called a sealing strip, which is specifically foam that plays a role in sealing, supporting and buffering, or it can be foamed rubber, silicone rubber composite material, etc. with similar effects. The support strip corresponds to the connection row area above the battery module 10, which can support the entire cover body 1 and keep it horizontal. In this embodiment 1, the support strip includes a first support strip 5 and a second support strip 6. The first support strip 5 is aligned with the first guide groove 111 along the thickness direction of the cover body 1, and the second support strip 6 is aligned with the third guide groove 113 along the thickness direction of the cover body 1, and the width of the second support strip 6 is smaller than the width of the first support strip 5. Such a support strip setting can provide targeted support at different positions, while ensuring the overall structural rigidity, reasonably distributing the support force, adapting to the stress requirements of different guide groove areas, and reducing the amount of support strip used below the middle reinforcing rib 4, thereby improving the overall performance and reliability of the battery pack. Meanwhile, when the lid body 1 is subjected to lateral force, the presence of the middle reinforcing rib 4 can resist the torsional tendency of the middle area, preventing the lid body 1 from twisting in the middle and warping on both sides. In addition, the width of the second support strip 6 on both sides is smaller than the width of the first support strip 5, so that the second support strip 6 corresponds to one row of connecting strips, while the first support strip 5 corresponds to two rows of connecting strips, realizing differentiated design, saving materials and space. Moreover, the first guide channel 111 lacks the support of the middle reinforcing rib 4 compared to the third guide channel 113, and has no longitudinal beam support. Therefore, the wider first support strip 5 and the first guide channel 111 can make up for part of the structural strength, thereby improving the resistance to deformation of the two sides of the lid body 1 and avoiding uneven stress caused by the middle being hard and the sides being soft.

[0047] In some embodiments, at least one island-shaped groove 8 is further provided on the first surface 11. The island-shaped groove 8 is located between the first guide channel 111 and the locking edge 2 along the length of the cover body 1. The drain port 21 is provided between the island-shaped groove 8 and the locking edge 2, and the drain port 21 corresponds to at least one bolt fixing point 22 of the locking edge 2. A third support strip 7 is provided in the area of ​​the second surface 12 facing the island-shaped groove 8. By providing the island-shaped groove 8 on the first surface 11 between the first guide channel 111 and the locking edge 2 along the length of the cover body 1, the liquid flow direction can be optimized, guiding the liquid to converge towards the drain port 21, and efficiently discharging the liquid in conjunction with the drain port 21, avoiding liquid accumulation and corrosion. The drain port 21 corresponds to at least one bolt fixing point 22 of the locking edge 2, which can strengthen the surrounding structure of the drain port 21 with the help of bolt fixing, and facilitate inspection and cleaning. At the same time, the third support strip 7 is provided on the second surface 12 facing the island-shaped groove 8, which can enhance the structural strength of this area, resist external pressure and vibration, ensure the overall stability of the cover, and improve the safety and reliability of the battery pack. The island-shaped groove 8 and the protruding area 114 are transitioned by an arc-shaped surface, which facilitates the guidance of liquid into the island-shaped groove 8.

[0048] In some embodiments, see Figure 3 As shown, the edge of the protruding area 114 has a guide surface 1141 that slopes inward toward the inside of the battery pack, with an inclination angle of 15°-45°. When thermal runaway occurs in the battery cells within the battery pack, a large amount of high-temperature, high-pressure gas is generated. This guide surface 1141 can effectively guide this thermal runaway gas to flow in a predetermined direction, preventing the gas from accumulating locally below the cover and forming a high-pressure area. This reduces the risk of serious safety accidents such as explosions and fires caused by the gas breaking through the cover and other structures, greatly improving the safety of the battery pack. Simultaneously, in conjunction with the support strips, the interior of the battery pack can be effectively divided into multiple areas, preventing the high-temperature, high-pressure gas from spreading to adjacent areas during thermal runaway. Furthermore, the 15°-45° inclination angle ensures good gas guidance without affecting the overall structural strength and stability of the cover due to excessively large or small angles. While ensuring safety functions, it also considers the rationality and reliability of the structure, which is beneficial for the long-term stable operation of the battery pack under complex operating conditions.

[0049] This invention also relates to a battery pack, which includes a housing frame 9, multiple battery modules 10, the aforementioned battery pack cover structure, and support strips. The multiple battery modules 10 are disposed within the housing frame 9, and the cover body 1 is bolted to the housing frame 9 via locking edges 2 on its edge. Furthermore, a sealing element can be pressed between the locking edge 2 and the housing frame 9 to improve sealing and waterproofing. Simultaneously, when the bolt fixing point 22 corresponds to the drain port 21, the pre-tightening force of the bolts can uniformly compact the sealing element around the drain port 21, eliminating the gap between the sealing element and the locking edge 2. This avoids the risk of liquid overflowing from the drain port 21 and seeping into the battery pack through the sealing gap, and also prevents external rainwater and moisture from intruding through the weak sealing area around the drain port 21, forming a dual protection of drainage and sealing, thus improving the overall waterproofing level of the battery pack. Multiple protruding areas 114 formed on the first surface 11 of the cover body 1 respectively project along the thickness direction of the cover body 1 to cover the cell explosion-proof valve 101 on each battery module 10. The side of the protruding area 114 facing the battery module 10 forms multiple spaced thermal runaway venting channels 20 between the protruding area 114 and the battery module 10. A support strip is disposed between the second surface 12 and the battery module 10 to isolate adjacent thermal runaway venting channels 20. This design allows the cover body 1 to be bolted to the box frame 9 via the locking edge 2, ensuring stability and reliability. The protruding area 114 projects to cover each battery module 10, corresponding to the cell explosion-proof valve 101 of the battery module 10. This valve can accurately catch ejected material in the event of cell thermal runaway and increases the exhaust space. The multiple spaced thermal runaway exhaust channels 20 formed between the cover and the battery module 10 can guide the thermal runaway gas out in an orderly manner, avoiding secondary damage caused by disordered gas impact. At the same time, the support strip set between the second surface 12 and the battery module 10 effectively isolates adjacent exhaust channels 20, preventing gas interference and further ensuring the safety and stability of the battery pack under thermal runaway conditions, thus extending the battery pack's service life. Specifically, an exhaust channel 20 can be formed between the second support strip 6 and the adjacent first support strip 5, and an exhaust channel 20 can also be formed between two adjacent first support strips 5. Each exhaust channel 20 corresponds to one battery module 10 to achieve gas isolation.

[0050] When thermal runaway occurs in a cell of the battery module 10 below a certain protruding area 114, the gas will rush upwards. After being guided by the guide surface 1141 of the cover body 1, it will disperse to both sides. Subsequently, it will be isolated by the support strip and flow towards the short edge of the cover body 1, eventually flowing to the explosion-proof valve installed on the short side of the battery pack, where it will release pressure. Due to the guiding effect of the thermal runaway exhaust channel 20 and the guide surface 1141, the continuous release of heat in one direction by the gas is prevented from damaging the electrical components, greatly improving the internal safety of the battery pack.

[0051] When the interrupted area 3 includes a bend 33, at least one bend 33 has its projection along the thickness direction of the cover body 1 located within the area of ​​the electrical compartment 30 of the battery pack. In the event of thermal runaway, the bend 33 can prevent high-temperature and high-pressure gas from directly entering the electrical compartment 30, thus avoiding damage to the precision electrical components inside the electrical compartment 30 and ensuring the normal operation of the electrical system.

[0052] When the interrupted area 3 includes the recessed portion 32, the area formed by the two recessed portions 32 positioned opposite each other along the width direction of the cover body 1 covers an electrical component within the electrical compartment 30 area of ​​the battery pack. This electrical component can be a BDU (Battery Energy Distribution Unit). This design cleverly provides installation and operating space for the electrical component, preventing interference from the cover structure, while also utilizing the recessed portion 32 structure to form a protective barrier for the electrical component to a certain extent, reducing the impact of external factors on the electrical component. The two aspects work together to improve the safety and reliability of the battery pack under extreme conditions such as thermal runaway.

[0053] In this embodiment 1, the battery module 10 is provided with multiple FPC fuses 102. Each FPC fuse 102 is located directly below any thermal runaway venting channel 20 formed by the protruding area 114, meaning that the projection of the FPC fuse 102 in the thickness direction of the cover body 1 falls within the area of ​​the protruding area 114 facing the battery pack. Due to the presence of the support strip, the distance between the FPC fuse 102 and the cover body 1 is further increased, effectively protecting the fuse and greatly reducing the risk of damage to the fuse when the cover body 1 is deformed by external force. Therefore, the thermal runaway venting channel 20 achieves both the beneficial effects of guiding thermal runaway gas and protecting the FPC fuse 102 while saving space.

[0054] In this embodiment 1, the box cover body 1 is arranged symmetrically as a whole, referring to... Figure 1 and Figure 4As shown, three rows of battery modules 10 are respectively arranged on both sides of the middle reinforcing rib 4. The three rows of battery modules 10 are separated by two first guide channels 111, and the ends of the two first guide channels 111 away from the electrical compartment 30 are connected by an arc-shaped part 31. One of the ends of the two first guide channels 111 near the electrical compartment 30 is connected to the locking edge 2 to form a bent part 33 with a bending angle of 90°. The other is connected to the third guide channel 113 next to the middle reinforcing rib 4 through the structure of the arc-shaped part 31. Due to the symmetrical design, the two third guide channels 113 and the two first guide channels 111 form a structure with two arc-shaped parts 31. The structure of the two arc-shaped parts 31 extends towards the short side of the cover body 1 to form a wider drain port 21. Concave portions 32 are formed on both sides of the drain port 21 to improve the strength of the drain port 21 and effectively protect the BDU in the electrical compartment 30 below it. Each battery module 10 is divided into two groups by a second guide channel 112, and the two ends of the second guide channel 112 form a bend 33 between the locking edge 2 of the long side of the cover body 1, where the bending angle of the bend 33 is 30°. The bend 33 also helps to increase the number of drain ports 21 on the long side of the cover body 1 and reduce local liquid accumulation.

[0055] It should be noted that the drain outlet 21 between the bent portion 33 and the locking edge 2 preferably corresponds to one bolt fixing point 22. The purpose is to reduce the stress concentration that bolt fixing will cause to the lid material. If two bolt fixing points 22 are set, more stress concentration points will be formed in the local area of ​​the lid, and the area between the two bolt fixing points 22 is also prone to structural damage such as cracks and deformation of the lid body 1 due to stress superposition. Corresponding to one bolt fixing point 22 can reduce the number of stress concentration points, make the stress distribution more uniform, reduce the possibility of structural damage to the lid body 1 caused by bolt fixing, and better ensure the integrity and durability of the lid body 1 structure.

[0056] It should be noted that in other embodiments, the structure of the cover body 1 can be redesigned according to the number and distribution of the battery modules 10, and the bending angle of the bending portion 33 is preferably in the range of 30°-90°. The number of the first guide channel 111, the second guide channel 112 and the third guide channel 113 can also be increased or decreased at will. Similarly, the type of the interruption area 3 provided in the first guide channel 111, the second guide channel 112 and the third guide channel 113 can also be selected at will, as long as the same effect can be achieved.

[0057] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications are also considered within the scope of protection of this invention.

Claims

1. A battery pack case cover structure, characterized in that, Includes a box cover body (1) integrally stamped, the box cover body (1) including a first side (11) facing away from the battery pack and a second side (12) facing the battery pack; The first surface (11) is provided with a plurality of first guide grooves (111) and second guide grooves (112) that are recessed from the first surface (11) to the second surface (12). The first guide grooves (111) extend along the length direction of the box cover body (1), and the second guide grooves (112) extend along the width direction of the box cover body (1). The first guide grooves (111) and the second guide grooves (112) are connected in an alternating manner to divide and form a plurality of independent protruding areas (114). The ends of the first guide channel (111) and / or the second guide channel (112) are provided with interruption areas (3); The box cover body (1) is provided with a locking edge (2) around its edge. The locking edge (2) is recessed from the first surface (11) to the second surface (12). The height of the locking edge (2) is lower than that of the first guide groove (111) and the second guide groove (112). The position of at least part of the locking edge (2) corresponding to the interrupted area (3) is connected to the first guide channel (111) and / or the second guide channel (112) to form a drain port (21).

2. The battery pack cover structure according to claim 1, characterized in that, The interrupted area (3) includes an arc-shaped portion (31) connecting the ends of the adjacent first guide channel (111), the drain port (21) is located at the outer edge of the arc-shaped portion (31), and the projection position of the drain port (21) on the locking edge (2) corresponds to at least one bolt fixing point (22).

3. The battery pack cover structure according to claim 1, characterized in that, The interrupted area (3) includes a bent portion (33) disposed at the end of the first guide channel (111) and / or the end of the second guide channel (112), and the drain port (21) is disposed at one end of the bent portion (33) facing the locking edge (2), and the drain port (21) corresponds to at least one bolt fixing point (22) of the locking edge (2).

4. The battery pack cover structure according to claim 1, characterized in that, The interrupted area (3) includes a recess (32) disposed on one side of the first guide groove (111). The width of the first guide groove (111) corresponding to the recess (32) is smaller than the width of other areas of the first guide groove (111). The recess (32) is used to correspond to the electrical components inside the battery pack.

5. A battery pack cover structure according to any one of claims 1-4, characterized in that, The middle area of ​​the cover body (1) is provided with a middle reinforcing rib (4) extending along the length direction of the cover body (1). The middle reinforcing rib (4) protrudes from the second surface (12) toward the first surface (11), so that the second surface (12) forms a clearance space (41) to avoid the connection row in the battery pack.

6. The battery pack case cover structure according to claim 5, characterized in that, The middle reinforcing rib (4) has a third guide groove (113) formed on both sides, and the width of the third guide groove (113) is smaller than the width of the first guide groove (111). The second surface (12) is provided with a first support strip (5) and a second support strip (6). The first support strip (5) is directly opposite the first guide groove (111) along the thickness direction of the box cover body (1). The second support strip (6) is directly opposite the third guide groove (113) along the thickness direction of the box cover body (1). The width of the second support strip (6) is smaller than the width of the first support strip (5).

7. A battery pack cover structure according to any one of claims 1-4, characterized in that, The first surface (11) is provided with at least one island-shaped groove (8), the island-shaped groove (8) is located between the first guide groove (111) and the locking edge (2) in the length direction of the box cover body (1), the drain port (21) is provided between the island-shaped groove (8) and the locking edge (2), and the drain port (21) corresponds to at least one bolt fixing point (22) of the locking edge (2). The second surface (12) is provided with a third support strip (7) in the area facing the island-shaped groove (8).

8. A battery pack cover structure according to any one of claims 1-4, characterized in that, The edge of the protruding area (114) is formed with a guide surface (1141) that is inclined toward the inside of the battery pack. The inclination angle of the guide surface (1141) is 15°-45°, which is used to guide the flow of thermal runaway gas.

9. A battery pack, characterized in that, include: Box frame (9); Multiple battery modules (10) are disposed within the housing frame (9); According to any one of claims 1-8, the battery pack cover structure is provided, wherein the cover body (1) is bolted to the box frame (9) via a locking edge (2) on its edge; Among them, the projections of the multiple protruding areas (114) along the thickness direction of the box cover body (1) cover the cell explosion-proof valve (101) on each of the battery modules (10), and the side of the protruding area (114) facing the battery module (10) forms multiple mutually spaced thermal runaway exhaust channels (20) between the battery module (10) and the battery module (10). At least one support bar is disposed between the second surface (12) and the battery module (10) and cooperates with the first guide groove (111) and / or the second guide groove (112) to isolate the adjacent thermal runaway exhaust channels (20).

10. A battery pack according to claim 9, characterized in that, Including the bending portion (33) as described in claim 3, at least one of the bending portions (33) is projected along the thickness direction of the cover body (1) into the area of ​​the electrical compartment (30) of the battery pack, thereby preventing gas from directly entering the electrical compartment (30) in the event of thermal runaway; And / or, including the recess (32) as claimed in claim 4, the area formed by two recesses (32) being disposed opposite each other along the width direction of the cover body (1), the projection of the cover body (1) along the thickness direction covering an electrical component in the electrical compartment (30) area of ​​the battery pack.

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