Power battery and vehicle

Abstract

The invention relates to a power battery and a vehicle, the power battery comprises a box body beam and a power battery internal sealing cavity, the box body beam is provided with an anti-scratch bottom cavity, and the anti-scratch bottom cavity is independently arranged relative to the power battery internal sealing cavity and is sealed and isolated; the anti-scratching bottom cavity is formed in the bottom of the box beam and arranged in the circumferential direction of the box beam in a surrounding mode. The anti-scratching bottom cavity is formed in the box body beam, the anti-scratching capability of the whole battery pack can be improved, and the anti-scratching bottom cavity is sealed and isolated from the internal sealing cavity of the power battery, so that the air tightness of the internal sealing cavity of the power battery is not influenced even if the anti-scratching bottom cavity is collided and damaged. The anti-scraping bottom cavity is formed in the bottom of the box beam and surrounds the box beam in the circumferential direction, the anti-scraping capacity of a vehicle chassis can be enhanced in the circumferential direction of the periphery, it can be ensured that a sealing cavity of a whole vehicle battery pack is not scratched or damaged in different directions, and then the safety of a power battery is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of power battery protection structures, and more specifically, to a power battery and a vehicle. Background Art

[0002] At present, most electric vehicles on the market will suffer serious damage to the power battery after a bottom collision, and replacing a new power battery will cost at least 100,000 yuan; in serious cases, the power battery will directly cause thermal runaway, endangering the life of the owner. The main reason for this phenomenon is that the structural strength of the power battery in the bottom anti-scratch design of most electric vehicles on the market at present cannot effectively cover the bottom collision strength that the owner may face in most cases, so once a scratch occurs, it will cause serious property damage and life safety hazards.

[0003] Most traditional power batteries use bottom cooling, that is, the liquid cooling plate is arranged at the bottom of the power battery. In order to protect the liquid cooling system, a bottom guard plate is added to the bottom. The bottom guard plate is fixed to the box beam by bolts. The bottom guard plate protection structure generally uses steel plates or profile plates. The box beam-cold plate-bottom guard plate constitute the main structure of the bottom protection of traditional power batteries. Since the box beam of traditional power batteries is connected to the internal cavity of the power battery, once the box beam or cold plate cracks, the air tightness of the entire power battery package will fail. Once the power battery is hit at the bottom and any of the above three causes damage, the bottom protection structure of the entire package and the internal airtight integrity will fail.

[0004] How to effectively solve the above-mentioned problems of insufficient bottom protection and the risk of air tightness of the entire package is a technical issue that existing electric vehicles need to pay attention to. Summary of the invention

[0005] The purpose of this application is to provide a power battery and a vehicle, which can improve the anti-scratch ability of the power battery through a scratch-proof structure at the bottom of the power battery and ensure the integrity of the sealing inside the box after a scratch occurs, thereby ensuring the safety of the power battery.

[0006] In order to achieve the above-mentioned object, in a first aspect, the present invention provides a power battery, comprising a box beam and a sealed cavity inside the power battery, wherein the box beam is provided with an anti-scratch bottom cavity, and the anti-scratch bottom cavity is independently provided with respect to the sealed cavity inside the power battery and is sealed and isolated;

[0007] The anti-scratch bottom cavity is arranged at the bottom of the box beam and is arranged around the circumference of the box beam.

[0008] In an optional embodiment, a box upper cover and a liquid cooling plate are installed on the box beam, and the enclosed space of the box upper cover, the liquid cooling plate and the box beam constitutes an internal sealed cavity of the power battery;

[0009] A bottom guard plate is arranged at the lower part of the liquid cooling plate, and the anti-scratch bottom cavity is arranged at the circumferential periphery of the bottom guard plate.

[0010] In an optional embodiment, the box beam is arranged on the circumference of the power battery, the anti-scratch bottom cavity is arranged at the lower part of the liquid cooling plate installation plane, and the bottom guard plate is arranged on the radial inner side of the anti-scratch bottom cavity.

[0011] In an optional embodiment, the bottom guard plate is installed below the liquid cooling plate, and a foam plate is arranged between the liquid cooling plate and the bottom guard plate, and the foam plate includes a contoured foam plate, and the contoured foam plate includes a constructed groove structure to enable the contoured foam plate to be fully attached to the liquid cooling plate.

[0012] In an optional embodiment, the bottom guard plate includes a profile bottom guard plate with a double-layer plate cavity structure, the profile bottom guard plate includes a profile top plate, a profile bottom plate and oblique ribs arranged between the profile top plate and the profile bottom plate, and the foam plate is clamped between the profile top plate and the liquid cooling plate.

[0013] In an optional embodiment, the bottom guard plate is locked and attached to the box beam by a sealing connector, and the sealing connector includes a rivet nut, a rivet bolt and a sealing plug. The barrel portion of the rivet nut is sealed and passed through the liquid cooling plate and then riveted to the box beam, and the nut portion of the rivet nut is exposed in the gap between the bottom guard plate and the liquid cooling plate.

[0014] In an optional embodiment, the rivet bolt passes through the profile top plate and is screwed into the cylinder of the rivet nut, the bolt head of the rivet bolt remains in the cavity between the profile top plate and the profile bottom plate, and the sealing plug cover is installed in the opening portion of the profile bottom plate and is opposite to the connection point of the rivet bolt.

[0015] In an optional embodiment, the box beam includes a plurality of separately assembled pieces, and the overlaps between each of the box beams are welded, and the welded parts include an external weld exposed on the box beam, and an internal weld opposite to the external weld, and the external weld and the internal weld jointly isolate the anti-scratch bottom cavity;

[0016] A welding fracture communicating with the anti-scratch bottom cavity is arranged at the bottom of the overlapping part between the box beams, and a blocking block is installed on the welding fracture.

[0017] In an optional embodiment, the liquid cooling plate is fixedly attached to the box beam by flow drill screws;

[0018] The pull rivet nut includes a first pull rivet nut and a second pull rivet nut, and the pull rivet bolt includes a first pull rivet bolt and a second pull rivet bolt that are correspondingly arranged, the first pull rivet nut and the first pull rivet bolt are arranged at the edges of the box beam and the bottom guard plate, and an elastic sealing strip is arranged between the edge parts of the box beam and the bottom guard plate, and a rigid limiting portion is arranged between the box beam and the bottom guard plate, and the thickness of the rigid limiting portion is 2 / 5-3 / 5 of the thickness of the elastic sealing strip in a natural state;

[0019] The second rivet nut and the second rivet bolt are arranged in the middle of the box beam and the bottom guard plate, and an elastic sealing gasket and a rigid gasket are arranged between the box beam and the bottom guard plate. The second rivet bolt passes through the elastic sealing gasket and the rigid gasket, and the rigid gasket is arranged on the radial outside of the elastic sealing gasket, and the thickness of the rigid gasket is smaller than the thickness of the elastic sealing gasket in a natural state.

[0020] In a second aspect, the present invention provides a vehicle comprising the power battery described in any one of the aforementioned embodiments.

[0021] By providing an anti-scratch bottom cavity on the box beam, the anti-scratch ability of the entire battery pack can be improved. By sealing and isolating the anti-scratch bottom cavity from the internal sealed cavity of the power battery, the airtightness of the internal sealed cavity of the power battery will not be affected even if it is bumped or damaged.

[0022] The anti-scratch bottom cavity is set at the bottom of the box beam and is arranged around the circumference of the box beam. It can enhance the anti-scratch ability of the vehicle chassis in the outer circumferential direction, and can ensure that the sealed cavity of the entire vehicle battery pack is not scratched and damaged in different directions, thereby ensuring the safety of the power battery.

[0023] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the split structure of the power battery in this application;

[0026] Figure 2 This is a schematic diagram of the bottom structure of the power battery in this application;

[0027] Figure 3 for Figure 2 Schematic diagram of the partial cutaway structure of the edge of the middle box beam;

[0028] Figure 4 for Figure 2 A schematic diagram of the partial cross-section structure of the rivet bolt in the middle of the midsole guard plate;

[0029] Figure 5 for Figure 4 Schematic diagram of the enlarged structure;

[0030] Figure 6 for Figure 1 Structural schematic diagram of the joints between the middle box beams;

[0031] Figure 7 for Figure 6 Schematic diagram of the enlarged structure.

[0032] icon:

[0033] 1- box beam; 11- anti-scratch bottom cavity;

[0034] 2-Box cover;

[0035] 3-liquid cooling plate; 31-flow drill screw;

[0036] 4- bottom guard plate; 41- profile top plate; 42- profile bottom plate; 43- oblique rib;

[0037] 5-Foam board;

[0038] 6-pull rivet nut; 61-first pull rivet nut; 62-second pull rivet nut;

[0039] 7-pull rivet bolt; 71-first pull rivet bolt; 72-second pull rivet bolt;

[0040] 8-Sealing plug cover;

[0041] 9-weld; 91-internal weld; 92-external weld; 93-weld fracture; 94-blocking block;

[0042] 10-elastic sealing strip; 20-rigid limiting part; 30-elastic sealing gasket; 40-rigid gasket. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0044] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0045] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The power battery in this application is mainly used in electric vehicles. Specifically, the anti-scratch performance of the bottom of the power battery is improved by changing the structure of the bottom of the entire battery pack, thereby improving the safety of the power battery.

[0047] See also Figure 1 , and combined with Figure 2-Figure 7 The power battery in the present invention has a main structure including a conventional box beam 1, a liquid cooling plate 3 and a bottom guard plate 4. A box upper cover 2 is installed on the top of the box beam 1. The enclosed space between the box upper cover 2, the liquid cooling plate 3 and the box beam 1 constitutes an internal sealed cavity of the power battery of the electric vehicle.

[0048] Different from the existing bottom protection plate 4, in the present application, the enclosed space between the box upper cover 2, the liquid cooling plate 3 and the box beam 1 forms a sealed cavity for the entire battery pack. A protective structure and a protective cavity can be arranged in the area below it to form an anti-scratch space and structure independent of the sealed cavity for the entire battery pack.

[0049] Based on the above basic structural composition, the present invention enhances the anti-scratch performance of the bottom of the box beam 1 by arranging a necessary additional anti-scratch bottom cavity 11 at the bottom of the box beam 1, and at the same time, by independently arranging the anti-scratch bottom cavity 11 relative to the internal sealed cavity of the power battery and sealing and isolating it, even if the anti-scratch bottom cavity 11 is damaged by collision, it will not affect the airtightness of the entire battery pack, so that the anti-scratch bottom cavity 11 constitutes the peripheral protection of the entire battery pack.

[0050] By setting the anti-scratch bottom cavity 11 at the bottom of the box beam 1 and surrounding it in the circumferential direction of the box beam 1, the anti-scratch performance can be enhanced from different angles and directions, so that the entire battery pack can be protected in all directions.

[0051] In one of the specific embodiments, combined with the structural basis of the internal sealed cavity of the power battery described above, a bottom protective plate 4 is provided at the lower part of the liquid cooling plate 3 to form a bottom protection structure for the sealed cavity of the entire battery pack, thereby effectively preventing the sealed cavity of the entire battery pack from being damaged due to bumps, thereby causing failure of the sealing.

[0052] The bottom guard plate 4 can provide protection for the entire battery package in the bottom direction. In the circumferential direction, by setting the anti-scratch bottom cavity 11 on the circumferential periphery of the bottom guard plate 4, the anti-scratch bottom cavity 11 of the box beam 1 can constitute a protective state of circumferentially outwardly wrapping the bottom guard plate 4, thereby maximizing the safety performance.

[0053] The box beam 1 in this embodiment is arranged in the circumferential direction of the power battery, and the anti-scratch bottom cavity 11 is arranged at the lower part of the installation plane of the liquid cooling plate 3, so as to ensure that the internal sealed space above the liquid cooling plate 3, that is, the internal sealed cavity of the power battery, is much higher than the lowest end of the box beam 1, so that the lowest point of the entire power battery package is the anti-scratch bottom cavity 11, even if the anti-scratch bottom cavity 11 on the box beam 1 is bumped and causes structural cracking and failure, it will not affect the sealing failure of the internal sealed space of the entire battery package, thereby ensuring the safety of the entire battery package.

[0054] Furthermore, the bottom guard plate 4 is arranged on the radial inner side of the anti-scratch bottom cavity 11. Combined with the circumferential arrangement of the box beam 1 on the power battery, the box beam 1, especially the anti-scratch bottom cavity 11 on the box beam 1, can form a state in which the bottom guard plate 4 is completely surrounded by the box beam 1, thereby protecting the battery pack from scratches from all angles.

[0055] The bottom guard plate 4 is installed under the liquid cooling plate 3 to form a protective structure for the bottom of the liquid cooling plate 3. A foam plate 5 is arranged between the liquid cooling plate 3 and the bottom guard plate 4. When a collision occurs, the foam plate 5 absorbs the impact energy corresponding to the collision, thereby ensuring that the flow channel of the liquid cooling plate 3 located above it is not squeezed and deformed.

[0056] Specifically, the foam plate 5 includes a contoured foam plate 5, which includes a constructed groove structure for filling the features of the depressions between the flow channels of the liquid cooling plate 3 and completely covering the entire area of ​​the liquid cooling plate 3. When a collision occurs, the contoured foam plate 5 can effectively absorb the impact and further ensure that the flow channel of the upper liquid cooling plate 3 is not squeezed and deformed.

[0057] Furthermore, the contoured foam plate 5 can be completely attached to the liquid cooling plate 3 , and thus the contoured foam plate 5 can provide sufficient and complete flexible protection to the liquid cooling plate 3 at the lower part of the liquid cooling plate 3 .

[0058] In order to enhance the structural strength of the bottom guard plate 4 while not affecting the sealing of the battery pack sealed cavity on the top of the bottom guard plate 4 when slightly bumped, the bottom guard plate 4 includes a profile bottom guard plate 4 with a double-layer plate cavity structure, which can make the double-layer plate cavity of the bottom guard plate 4 form a collision protection cavity below the battery pack sealed cavity.

[0059] The profile bottom guard plate 4 includes a profile top plate 41, a profile bottom plate 42 and an oblique rib 43 arranged between the profile top plate 41 and the profile bottom plate 42. The oblique rib 43 is mainly used to form a structural support between the profile top plate 41 and the profile bottom plate 42, which can constitute a certain support strength and enhance the anti-deformation performance after collision prevention from another angle.

[0060] From the perspective of functional installation, the foam plate 5 is clamped between the profile top plate 41 and the liquid cooling plate 3, so that the foam plate 5 constitutes a flexible buffer between the bottom guard plate 4 and the liquid cooling plate 3. After the bottom guard plate 4 in the form of the profile bottom guard plate 4 is used to provide hard protection on the bottom side of the sealed cavity of the entire battery pack, the foam plate 5 can provide effective and reliable flexible protection for the liquid cooling plate 3.

[0061] In terms of the specific composition of the bottom guard plate 4, the overall bottom guard plate 4 includes three profile bottom guard plates 4 welded together, and the profile bottom guard plate 4 is locked and attached to the box beam 1 through a sealing connector, and the sealing connector includes a rivet nut 6, a rivet bolt 7 and a sealing plug cover 8.

[0062] Furthermore, the barrel portion of the rivet nut 6 is sealed and connected through the liquid cooling plate 3 and then riveted to the box beam 1, so that the rivet nut 6 is fixed to the box beam 1 through the riveting process. After the rivet nut 6 is fixed to the box beam 1, its structural characteristics enable it to have good sealing performance at the connection portion. Therefore, after the bottom guard plate 4 is locked to the box beam 1, especially after the rivet nut 6 is connected through the liquid cooling plate 3, it will not affect the internal sealing performance of the sealed cavity of the entire battery pack.

[0063] After the barrel part of the rivet nut 6 passes through the liquid cooling plate 3, the nut part of the rivet nut 6 is exposed in the gap between the bottom guard plate 4 and the liquid cooling plate 3. On the one hand, the nut of the rivet nut 6 can seal the penetration point of the barrel part of the rivet nut 6 at the liquid cooling plate 3. On the other hand, it can reduce the interference of the nut of the rivet nut 6 on the bottom guard plate 4, and at the same time, it can be conducive to forming a support gap between the bottom guard plate 4 and the liquid cooling plate 3, and then the structural anti-collision protection cavity can be better formed through the support gap.

[0064] The profile bottom guard plate 4 is locked to the box beam 1 by means of rivet bolts 7. On the basis that the rivet nut 6 is locked to the box beam 1, the rivet bolts 7 pass through the profile top plate 41 and are screwed into the cylinder of the rivet nut 6. Specifically, the rivet bolts 7 pass through the profile top plate 41 and are threadedly connected to the inner side of the cylinder of the rivet nut 6, so that the bottom guard plate 4 is fixedly installed by means of the rivet bolts 7.

[0065] When the bottom of the power battery is scratched, if the rivet bolt 7 is scratched, the rivet bolt 7 may damage the sealing of the rivet nut 6 after being stressed. At this time, the airtightness of the entire battery pack will fail due to the scratching of the rivet bolt 7 on the profile bottom guard plate 4.

[0066] Therefore, based on the collision risk of the rivet bolt 7, the present invention hides the rivet bolt 7 by countersinking it, that is, setting the rivet bolt 7 as the lowest point other than the bottom, and protecting the installation position of the rivet bolt 7 to avoid the risk of damaging the sealed cavity by collision.

[0067] Based on the double-layer structure of the profile bottom guard plate 4, the locking interface of the rivet bolt 7 is the upper surface of the profile bottom guard plate 4, that is to say, the bolt head of the rivet bolt 7 is hidden in the cavity between the profile top plate 41 and the profile bottom plate 42, and at the same time, the bolt head of the rivet bolt 7 is hidden inside the profile bottom guard plate 4, which will realize the hidden installation of the bottom guard plate 4 of the rivet bolt 7 and reduce the risk of exposed bumps and damage to the sealed cavity of the entire battery pack.

[0068] At the same time, in order to further protect the rivet bolt 7, a sealing plug 8 is installed at the opening of the profile bottom plate 42 and is opposite to the connection point of the rivet bolt 7. By adding a plastic sealing plug 8, the rivet bolt 7 is completely enclosed in the form of a buckle, thereby enhancing the protection performance to the greatest extent.

[0069] Based on the structural shape of the entire battery pack, the box beam 1 includes multiple pieces that are assembled separately, and the overlaps between each box beam 1 are welded. The welding parts include an external weld 92 exposed on the box beam 1, and an internal weld 91 opposite to the external weld 92. The external weld 92 and the internal weld 91 jointly isolate the anti-scratch bottom cavity 11;

[0070] A welding fracture 93 communicating with the anti-scratch bottom cavity 11 is provided at the bottom of the overlapping portion between the box beams 1 , and a blocking block 94 is installed on the welding fracture 93 .

[0071] See also Figure 7Taking the structure at the left front corner of the power battery as an example, since the box beams 1 on all sides are provided with an anti-scratch bottom cavity 11, when the box beams 1 are welded and assembled into a complete box body, the internal welds 91 at the overlap of each box beam 1 require welding space, and there will be welding fractures 93 at the end of the anti-scratch bottom cavity 11 of each box beam 1. The internal welds 91 weld the two anti-scratch bottom cavities 11 at the overlap of the inner upper surface, which is the core to ensure that the anti-scratch bottom cavity 11 does not affect the airtightness of the whole package, making the anti-scratch bottom cavity 11 completely independent of the airtightness of the whole package.

[0072] In order to prevent foreign matter from entering the independent anti-scratch bottom cavity 11 and ensure the aesthetics of the whole package, a blocking block 94 is added to the welding fracture 93 and welded to the box beam 1 to ensure the sealing of the anti-scratch bottom cavity 11. The blocking block 94 can be an integral extrusion or casting to facilitate welding and installation.

[0073] In the power battery of the present invention, the upper cover 2 of the box body is fastened to the box body beam 1 by bolts, the liquid cooling plate 3 is fastened to the box body beam 1 by FDS flow drill screws 31, the contoured foam plate 5 is adhered to the liquid cooling plate 3 by adhesive backing; the profile bottom guard plate 4 is fastened to the box body beam 1 by rivet bolts 7.

[0074] The box beam 1, liquid cooling plate 3, contoured foam and profile bottom guard plate 4 constitute the main structure of the bottom protection of the power battery of the present invention, and the space formed by the box upper cover 2, box beam 1 and liquid cooling plate 3 is the internal sealed cavity of the power battery.

[0075] Through the bottom protection structure of the power battery, the protection performance of the internal sealed cavity of the power battery can be enhanced at different angles, directions and details, and the internal sealed cavity of the power battery can be ensured to have good sealing properties, thereby avoiding safety risks to the greatest extent.

[0076] In order to form a seal between the bottom guard plate 4 and the box beam 1 , the connecting piece between the bottom guard plate 4 and the box beam 1 includes a first connecting piece located at the edge and a second connecting piece located in the middle.

[0077] Specifically, the rivet nut 6 includes a first rivet nut 61 and a second rivet nut 62 , and the rivet bolt 7 includes a first rivet bolt 71 and a second rivet bolt 72 that are correspondingly arranged.

[0078] The first rivet nut 61 and the first rivet bolt 71 constitute the above-mentioned first connecting member, which is arranged at the edges of the box beam 1 and the bottom guard plate 4, and an elastic sealing strip 10 is arranged between the edge parts of the box beam 1 and the bottom guard plate 4, and a rigid limiting portion 20 is arranged between the box beam 1 and the bottom guard plate 4, and the thickness of the rigid limiting portion 20 is 2 / 5-3 / 5 of the thickness of the elastic sealing strip 10 in a natural state.

[0079] By arranging the elastic sealing strip 10 at least one circle along the edge of the box beam 1 , the gap between the bottom guard plate 4 and the box beam 1 can be effectively blocked by the elastic sealing strip 10 , thereby forming a sealing interface between the bottom guard plate 4 and the box beam 1 .

[0080] On the other hand, by setting a rigid limiting portion 20 between the bottom guard plate 4 and the box beam 1, whose thickness is less than the thickness of the elastic sealing strip 10 in the natural state, the elastic compression amount of the elastic sealing strip 10 can be limited, thereby effectively avoiding the over-pressure failure of the elastic sealing strip 10 and ensuring the effectiveness and stability of the sealing interface between the bottom guard plate 4 and the box beam 1.

[0081] Combined with the fact that the thickness of the rigid limiting portion 20 is 2 / 5-3 / 5 of the thickness of the elastic sealing strip 10 in its natural state, it can be ensured that the elastic sealing strip 10 can have optimal sealing performance when pressed between the bottom guard plate 4 and the box beam 1.

[0082] In addition to the above-mentioned edge sealing connection, the second rivet nut 62 and the second rivet bolt 72 are arranged in the middle part of the box beam 1 and the bottom guard plate 4, constituting the second connecting member arranged in the middle part of the box beam 1 and the bottom guard plate 4 as mentioned above. From the perspective of sealing connection, an elastic sealing gasket 30 and a rigid gasket 40 are arranged between the box beam 1 and the bottom guard plate 4, and the second rivet bolt 72 passes through the elastic sealing gasket 30 and the rigid gasket 40. The rigid gasket 40 is arranged on the radial outside of the elastic sealing gasket 30, and the thickness of the rigid gasket 40 is less than the thickness of the elastic sealing gasket 30 in a natural state.

[0083] Furthermore, the rigid gasket 40 has the same size as the bolt head of the second rivet bolt 72, and the bolt head of the second rivet bolt 72 can completely cover the elastic sealing gasket 30. Through this arrangement, on the one hand, the elastic sealing gasket 30 can seal the through hole of the second rivet bolt 72 on the bottom guard plate 4. On the other hand, combined with the fact that the thickness of the rigid gasket 40 is less than the thickness of the elastic sealing gasket 30 in a natural state, the rigid gasket 40 can limit the maximum compression of the elastic sealing gasket 30 without hindering the compression sealing of the through hole of the elastic sealing gasket 30 on the bottom guard plate 4, thereby ensuring that the second rivet bolt 72 is locked with the box beam 1 while avoiding excessive compression of the elastic sealing gasket 30, which would lead to sealing failure, and effectively ensuring the effectiveness of the second rivet bolt 72 in the cavity of the bottom guard plate 4.

[0084] By means of the elastic sealing strip 10 and the elastic sealing gasket 30 arranged as above, the edge and middle parts of the bottom guard plate 4 can be further sealed, so that the connection part or the connecting part between the bottom guard plate 4 and the box beam 1 can be effectively sealed, and the gap between the box beam 1 and the bottom guard plate 4 above the bottom guard plate 4 and the through hole gap formed by the connection point of the rivet bolt 7 at the top plate 41 of the profile can be further sealed, thereby deepening the sealing effect.

[0085] The above-mentioned sealing part and the sealed protective cavity formed therefrom can prevent mud and sand impurities from entering between the bottom guard plate 4 and the liquid cooling plate 3 during daily use, and effectively avoid the risk of corrosion to the liquid cooling plate 3.

[0086] The power battery in the present invention has a new anti-scratch bottom cavity 11 below the box beam 1, which can effectively improve the scratch resistance of the entire package. The anti-scratch bottom cavity 11 is isolated from the internal cavity of the entire package, and even if it is bumped or damaged, it will not affect the airtightness of the entire package.

[0087] The bottom guard plate 4 is made of aluminum profile, which can effectively improve the bottom impact resistance. The locking bolts of the bottom guard plate 4 are hidden in the design to ensure that scratches will not damage the structure and air tightness of the rivet nut 6, thereby ensuring that even if there is a slight scratch on the bottom, it will not cause the air tightness of the entire package to fail.

[0088] A contoured foam plate 5 is filled between the bottom guard plate 4 and the liquid cooling plate 3. When a collision occurs, the contoured foam plate 5 filled therein can effectively absorb the impact, ensuring that the flow channel of the liquid cooling plate 3 is not squeezed and deformed.

[0089] The independent cavities of each box beam 1 are welded and sealed by sealing blocks 94, which can prevent foreign matter from entering the anti-scratch cavity.

[0090] Due to the presence of the contoured foam plate 5, the height between the liquid cooling plate 3 and the bottom guard plate 4 forms an airtight protective cavity that is completely independent of the entire package. At the same time, the cavity of the bottom guard plate 4 itself will also constitute a certain protective cavity, ensuring that the sealed cavity of the entire battery package is fully and effectively protected.

[0091] The power battery in the present invention specifically includes three chambers, namely, a sealed chamber for the entire battery pack, a circumferential anti-scratch bottom chamber 11, and a sealed protective chamber from the liquid cooling plate 3 to the bottom guard plate 4. Even if the anti-scratch bottom chamber 11 or one of the sealed protective chambers, or even two chambers at the same time are damaged, it will not affect the integrity of the sealed chamber for the entire battery pack, thereby ensuring that the entire battery pack is fully protected to the greatest extent.

[0092] The present invention also provides a vehicle, comprising the above-mentioned power battery, wherein by installing the power battery on an electric vehicle, the vehicle quality of the electric vehicle can be greatly improved and driving safety can be enhanced.

[0093] It should be noted that, in the absence of conflict, the features in the embodiments of this application may be combined with each other.

[0094] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power battery, characterized in that: It comprises a box beam and a sealed cavity inside a power battery, wherein the box beam is provided with an anti-scratch bottom cavity, and the anti-scratch bottom cavity is independently provided with respect to the sealed cavity inside the power battery and is sealed and isolated; The anti-scratch bottom cavity is arranged at the bottom of the box beam and is arranged around the circumference of the box beam.

2. The power battery according to claim 1, characterized in that: The box beam is provided with a box upper cover and a liquid cooling plate, and the enclosed space of the box upper cover, the liquid cooling plate and the box beam constitutes an internal sealed cavity of the power battery; A bottom guard plate is arranged at the lower part of the liquid cooling plate, and the anti-scratch bottom cavity is arranged at the circumferential periphery of the bottom guard plate.

3. The power battery according to claim 2, characterized in that: The box beam is arranged in the circumferential direction of the power battery, the anti-scratch bottom cavity is arranged at the lower part of the liquid cooling plate installation plane, and the bottom guard plate is arranged at the radial inner side of the anti-scratch bottom cavity.

4. The power battery according to claim 2, characterized in that: The bottom guard plate is installed below the liquid cooling plate, and a foam plate is arranged between the liquid cooling plate and the bottom guard plate. The foam plate includes a contoured foam plate, and the contoured foam plate includes a structurally formed groove structure to enable the contoured foam plate to be completely attached to the liquid cooling plate.

5. The power battery according to claim 4, characterized in that: The bottom guard plate includes a profile bottom guard plate with a double-layer plate cavity structure, the profile bottom guard plate includes a profile top plate, a profile bottom plate and oblique ribs arranged between the profile top plate and the profile bottom plate, and the foam plate is clamped between the profile top plate and the liquid cooling plate.

6. The power battery according to claim 5, characterized in that: The bottom guard plate is locked and attached to the box beam through a sealing connector, and the sealing connector includes a rivet nut, a rivet bolt and a sealing plug. The barrel portion of the rivet nut is sealed and passed through the liquid cooling plate and then riveted to the box beam, and the nut portion of the rivet nut is exposed in the gap between the bottom guard plate and the liquid cooling plate.

7. The power battery according to claim 6, characterized in that: The rivet bolt passes through the profile top plate and is screwed into the cylinder of the rivet nut. The bolt head of the rivet bolt remains in the cavity between the profile top plate and the profile bottom plate. The sealing plug cover is installed in the opening part of the profile bottom plate and is opposite to the connection point of the rivet bolt.

8. The power battery according to claim 2, characterized in that: The box beam comprises a plurality of separately assembled pieces, and the overlaps between each of the box beams are welded, and the welded parts include an external weld exposed on the box beam, and an internal weld opposite to the external weld, and the external weld and the internal weld jointly insulate the anti-scratch bottom cavity; A welding fracture communicating with the anti-scratch bottom cavity is arranged at the bottom of the overlapping part between the box beams, and a blocking block is installed on the welding fracture.

9. The power battery according to claim 6, characterized in that: The liquid cooling plate is locked and attached to the box beam by flow drill screws; The pull rivet nut includes a first pull rivet nut and a second pull rivet nut, and the pull rivet bolt includes a first pull rivet bolt and a second pull rivet bolt that are correspondingly arranged, the first pull rivet nut and the first pull rivet bolt are arranged at the edges of the box beam and the bottom guard plate, and an elastic sealing strip is arranged between the edge parts of the box beam and the bottom guard plate, and a rigid limiting portion is arranged between the box beam and the bottom guard plate, and the thickness of the rigid limiting portion is 2 / 5-3 / 5 of the thickness of the elastic sealing strip in a natural state; The second rivet nut and the second rivet bolt are arranged in the middle of the box beam and the bottom guard plate, and an elastic sealing gasket and a rigid gasket are arranged between the box beam and the bottom guard plate. The second rivet bolt passes through the elastic sealing gasket and the rigid gasket, and the rigid gasket is arranged on the radial outside of the elastic sealing gasket, and the thickness of the rigid gasket is smaller than the thickness of the elastic sealing gasket in a natural state.

10. A vehicle, characterized in that: A power battery comprising any one of claims 1 to 9.

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