Power battery and vehicle

Abstract

A power battery and a vehicle. The power battery comprises box body beams (1) and a power battery internal sealed cavity; the box body beams (1) are provided with anti-scratching bottom cavities (11); the anti-scratching bottom cavities (11) are independently arranged relative to the power battery internal sealed cavity and are sealedly isolated; and the anti-scratching bottom cavities (11) are arranged at the bottoms of the box body beams (1) and are arranged in the circumferential direction of the box body beams (1). By providing the anti-scratching bottom cavities (11) on the box body beams (1), the anti-scratching capability of the entire battery pack can be improved. By sealedly isolating the anti-scratching bottom cavities (11) from the power battery internal sealed cavity, even if collision damage occurs, the airtightness of the power battery internal sealed cavity is not affected. The anti-scratching bottom cavities (11) are arranged at the bottoms of the box body beams (1) and are arranged in the circumferential direction of the box body beams (1), which can enhance the anti-scratching capability of a vehicle chassis in the circumferential direction of the box body beams (1), and can ensure that the power battery internal sealed cavity is not scratched and damaged in different directions, thereby ensuring the safety of the power battery.

Description

A power battery and vehicle

[0001] Cross-reference to related applications

[0002] This disclosure claims priority to Chinese patent applications filed on December 19, 2024, with application number 2024118832561 entitled "A Power Battery and Vehicle" and application number 202423154393X entitled "Sealed Structure, Battery Pack and Vehicle", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of power battery protection structure technology, and in particular to a power battery and a vehicle. Background Technology

[0004] Currently, most electric vehicles on the market suffer severe damage to their batteries after a bottom impact. At best, this damage results in serious battery damage, with replacements costing at least tens of thousands of yuan. At worst, it can lead to thermal runaway, endangering the driver's life. The main reason for this is that the bottom-impact protection design of most electric vehicles on the market is insufficient to effectively cover the impact strength of bottom impacts in most situations a driver might encounter. Therefore, a minor collision can cause serious property damage and endanger lives.

[0005] Traditional power batteries mostly employ bottom cooling, meaning a liquid cooling plate is placed at the bottom of the battery. To protect the liquid cooling system, a bottom protective plate is added, which is bolted to the housing beam. This bottom protective plate is typically made of steel plate or profiled material. The housing beam, cooling plate, and bottom protective plate constitute the main structure for bottom protection of traditional power batteries. Because the housing beam is connected to the internal cavity of the battery, cracking of the housing beam or cooling plate will compromise the airtightness of the entire battery pack. Any impact to the bottom of the battery that damages any of these three components will cause the entire bottom protective structure and internal airtightness of the pack to fail.

[0006] How to effectively solve the problems of insufficient bottom protection and overall airtightness risks mentioned above is a technical issue that existing electric vehicles need to pay attention to. Summary of the Invention

[0007] The purpose of this disclosure is to provide a power battery and vehicle that can improve the anti-scratch capability of the power battery by using a structure at the bottom of the power battery to prevent scratches and ensure the integrity of the internal sealing of the battery after a scratch, thereby ensuring the safety of the power battery.

[0008] To achieve the above objectives, in a first aspect, this disclosure provides a power battery, including a housing beam and an internal sealed cavity of the power battery, wherein the housing beam is provided with an anti-scratch bottom cavity, and the anti-scratch bottom cavity is independently provided and sealed and isolated from the internal sealed cavity of the power battery.

[0009] The anti-scratch bottom cavity is located at the bottom of the box beam and is arranged around the circumference of the box beam.

[0010] In one optional embodiment, a box cover and a liquid cooling plate are installed on the box beam, and the space enclosed by the box cover, the liquid cooling plate and the box beam constitutes the internal sealed cavity of the power battery.

[0011] The liquid cooling plate is provided with a bottom protective plate at its lower part, and the anti-scratch bottom cavity is provided on the circumferential periphery of the bottom protective plate.

[0012] In one optional embodiment, the housing beam is disposed in the circumferential direction of the power battery, the anti-scratch bottom cavity is disposed below the liquid cooling plate mounting plane, and the bottom guard plate is disposed radially inside the anti-scratch bottom cavity.

[0013] In one alternative embodiment, the bottom protective plate is installed below the liquid cooling plate, and an insulation layer is provided between the liquid cooling plate and the bottom protective plate. The insulation layer includes a contoured foam board with a grooved structure to enable the contoured foam board to be completely attached to the liquid cooling plate.

[0014] In one optional embodiment, the bottom protective plate includes a profile bottom protective plate with a double-layer plate cavity structure, the profile bottom protective plate includes a profile top plate, a profile bottom plate and diagonal ribs disposed between the profile top plate and the profile bottom plate, and the insulation layer is sandwiched between the profile top plate and the liquid cooling plate.

[0015] In one optional embodiment, the bottom guard plate is locked to the box beam by a sealing connector, the sealing connector including a rivet nut, a rivet bolt and a sealing plug, the cylindrical part of the rivet nut passes through the liquid cooling plate and is then riveted to the box beam, and the nut part of the rivet nut is exposed in the gap between the bottom guard plate and the liquid cooling plate.

[0016] In one optional embodiment, the rivet bolt passes through the top plate of the profile and is screwed into the cylinder of the rivet nut. The bolt head of the rivet bolt is left in the cavity between the top plate of the profile and the bottom plate of the profile. The sealing plug is installed at the opening of the bottom plate of the profile and is opposite to the connection point of the rivet bolt.

[0017] In one optional embodiment, the box girder comprises multiple separately assembled pieces, with each piece of the box girder welded together at the lap joint. The welded portion includes an external weld exposed on the box girder and an internal weld opposite to the external weld. The external weld and the internal weld together isolate the anti-scratch bottom cavity.

[0018] The bottom of the lap joint between the box beams is provided with a welded joint that communicates with the anti-scratch bottom cavity, and a sealing block is installed on the welded joint.

[0019] In one alternative embodiment, the liquid cooling plate is secured to the box beam by flow drill screws;

[0020] The rivet nut includes a first rivet nut and a second rivet nut, and the rivet bolt includes a corresponding first rivet bolt and a second rivet bolt. The first rivet nut and the first rivet bolt are disposed on the edges of the box beam and the bottom guard plate, and an elastic sealing strip is disposed between the edges of the box beam and the bottom guard plate. A rigid limiting part is disposed between the box beam and the bottom guard plate, and the thickness of the rigid limiting part is 2 / 5 to 3 / 5 of the thickness of the elastic sealing strip in its natural state.

[0021] The second rivet nut and the second rivet bolt are disposed in the middle of the box beam and the bottom guard plate. An elastic sealing gasket and a rigid gasket are disposed between the box beam and the bottom guard plate. The second rivet bolt passes through the elastic sealing gasket and the rigid gasket. The rigid gasket is disposed on the radial outer side of the elastic sealing gasket, and the thickness of the rigid gasket is less than the thickness of the elastic sealing gasket in its natural state.

[0022] In one optional embodiment, the power battery includes a housing and a bottom protective plate arranged facing each other along a first direction, the sealing cavity is used to connect the housing and the bottom protective plate, the sealing cavity includes an edge sealing assembly, the edge sealing assembly includes a first elastic sealing part, a rigid limiting part and a first connecting bolt, the first elastic sealing part is arranged at least around the edge of the housing;

[0023] The first connecting bolt passes through the bottom guard plate and is threaded to the box body along the first direction, and the first elastic sealing part is press-fitted between the bottom guard plate and the box body;

[0024] The rigid limiting part is disposed on the bottom guard plate and the box body, and the size of the rigid limiting part in the first direction is smaller than the size of the first elastic sealing part in its natural elongation state.

[0025] In one optional embodiment, the first elastic sealing portion has a dimension of h in the first direction in its natural state, and the rigid limiting portion has a dimension of 0.4h to 0.6h in the first direction.

[0026] In one alternative embodiment, there are multiple first connecting bolts, which are spaced apart along the edge of the housing.

[0027] In one alternative embodiment, each of the first connecting bolts is fitted with the rigid limiting portion.

[0028] In one optional embodiment, the sealing cavity further includes a central sealing assembly for connecting the middle of the housing and the middle of the bottom protective plate;

[0029] The central sealing assembly includes a second elastic sealing part, a rigid gasket, and a second connecting bolt. The second connecting bolt passes through the second elastic sealing part and the bottom protective plate in sequence along the first direction, and the second connecting bolt is threadedly connected to the housing.

[0030] Both the rigid gasket and the second elastic sealing part are placed between the nut of the second connecting bolt and the bottom protective plate;

[0031] The rigid gasket and the second elastic sealing part are aligned with each other in the first direction, and in the first direction, the size of the rigid gasket is smaller than the size of the second elastic sealing part in its natural state.

[0032] In one optional embodiment, the bottom protective plate is provided with a countersunk hole, and the nut of the first connecting bolt or the second connecting bolt is embedded in the countersunk hole.

[0033] In one alternative embodiment, the rigid washer is fitted onto the outside of the second connecting bolt;

[0034] Alternatively, the rigid gasket may be fitted onto the outside of the second elastic seal.

[0035] Thirdly, this disclosure provides a vehicle including the power battery described in any of the foregoing embodiments.

[0036] By setting an anti-scratch bottom cavity on the housing beam, the anti-scratch capability 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, even if there is a collision or damage, the airtightness of the internal sealed cavity of the power battery will not be affected.

[0037] The anti-scratch bottom cavity is located at the bottom of the box beam and is arranged around the circumference of the box beam. It can enhance the anti-scratch capability of the vehicle chassis in the outer circumference and ensure that the sealed cavity of the entire battery pack is not scratched or damaged in different directions, thereby ensuring the safety of the power battery.

[0038] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 is a schematic diagram of the split structure of the power battery in this disclosure;

[0041] Figure 2 is a schematic diagram of the bottom structure of the power battery in this disclosure;

[0042] Figure 3 is a schematic diagram of a partial cross-sectional structure of the edge of the box beam in Figure 2;

[0043] Figure 4 is a partial cross-sectional view of the rivet bolt area in the middle of the bottom guard plate in Figure 2;

[0044] Figure 5 is an enlarged structural schematic diagram of Figure 4;

[0045] Figure 6 is a structural schematic diagram of the splicing part between the box beams in Figure 1;

[0046] Figure 7 is an enlarged structural schematic diagram of Figure 6;

[0047] Figure 8 is a schematic diagram of the exploded structure of the power battery provided in the embodiment of this disclosure;

[0048] Figure 9 is a front view of the power battery provided in an embodiment of this disclosure;

[0049] Figure 10 is a cross-sectional view of the edge sealing assembly provided in an embodiment of this disclosure;

[0050] Figure 11 is a cross-sectional view of the central sealing assembly provided in an embodiment of this disclosure.

[0051] Icons: 1-Box beam; 11-Anti-scratch bottom cavity; 2-Box top cover; 3-Liquid cooling plate; 31-Drill screw; 4-Bottom guard plate; 41- 42-Top plate of profile; 43-Diagonal rib; 5-Insulation layer; 6-Rivet nut; 61-First rivet nut; 62-Second rivet nut; 7-Rivet bolt; 71-First rivet bolt; 72-Second rivet bolt; 8-Sealing plug; 9-Weld; 91-Internal weld; 92-External weld; 93-Welded fracture; 94-Sealing block; 10-Elastic sealing strip; 20-Rigid limiting part; 30-Elastic sealing gasket; 40-Rigid gasket; 12-Box body; 44-Outer protective plate; 45-Inner lining plate; 13-Edge sealing assembly; 311-First elastic sealing part; 312-First connecting bolt; 32-Center sealing assembly; 321-Second elastic sealing part; 322-Second connecting bolt; F1-First direction. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0053] In the description of this disclosure, it should be noted that the terms "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. In addition, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0055] The power battery disclosed herein is mainly used in electric vehicles. Specifically, by changing the structure of the bottom of the battery pack, the anti-scratch performance of the bottom of the power battery is improved, thereby enhancing the safety of the power battery in use.

[0056] Referring to Figure 1, and in conjunction with Figures 2-7, the main structure of the power battery in this disclosure includes a conventional box beam 1, a liquid cooling plate 3, and a bottom protective plate 4. A box cover 2 is installed on the top of the box beam 1. The enclosing space between the box cover 2, the liquid cooling plate 3, and the box beam 1 constitutes the internal sealed cavity of the power battery of the electric vehicle.

[0057] Unlike existing systems that use a bottom protective plate 4 for bottom protection, this disclosure constructs a sealed battery pack cavity by forming the enclosing space between the top cover 2, the liquid cooling plate 3, and the box beam 1. Furthermore, a protective structure and a protective cavity can be set up in the area below it to form a scratch-resistant space and structure independent of the sealed battery pack cavity.

[0058] Based on the above basic structural composition, this disclosure enhances the anti-scratch performance of the bottom of the box beam 1 by providing an additional anti-scratch cavity 11 at the bottom of the box beam 1. At the same time, by setting the anti-scratch cavity 11 independently and sealing it relative to the internal sealed cavity of the power battery, even if the anti-scratch cavity 11 is damaged by impact, the airtightness of the entire battery pack will not be affected, thus making the anti-scratch cavity 11 an external protection for the entire battery pack.

[0059] By setting the anti-scratch bottom cavity 11 at the bottom of the housing beam 1 and making it surround the housing beam 1 in the circumferential direction, the anti-scratch performance can be enhanced from different angles and directions, so that the entire battery pack can be protected in all directions.

[0060] In one specific embodiment, based on the structural foundation 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 protective structure for the sealed cavity of the entire battery pack, which effectively prevents the sealed cavity of the entire battery pack from being damaged by impacts, thereby causing sealing failure.

[0061] The bottom guard plate 4 can provide protection for the entire battery pack 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 form a circumferential outer protective state for the bottom guard plate 4, thereby maximizing the safety performance.

[0062] In this embodiment, the housing beam 1 is positioned in the circumferential direction of the power battery, and the anti-scratch bottom cavity 11 is positioned below the mounting plane of the liquid cooling plate 3. This ensures that the internal sealed space above the liquid cooling plate 3, i.e., the internal sealed cavity of the power battery, is much higher than the lowest point of the housing beam 1, making the lowest point of the entire power battery pack the anti-scratch bottom cavity 11. Even if the anti-scratch bottom cavity 11 on the housing beam 1 is bumped and causes structural cracking and failure, it will not affect the sealing performance of the internal sealed space of the entire battery pack, thus ensuring the safety of the entire battery pack.

[0063] Furthermore, the bottom guard plate 4 is set on the radial inner side of the anti-scratch bottom cavity 11. Combined with the arrangement of the box beam 1 in the circumferential direction of the power battery, it can form a state in which the box beam 1, especially the anti-scratch bottom cavity 11 on the box beam 1, completely surrounds the bottom guard plate 4, and provides anti-scratch protection for the battery pack from all angles.

[0064] The bottom protective plate 4 is installed below the liquid cooling plate 3 to form a protective structure for the bottom of the liquid cooling plate 3. An insulation layer 5 (which can be a foam board) is provided between the liquid cooling plate 3 and the bottom protective plate 4. When an impact occurs, the insulation layer 5 can absorb the impact energy corresponding to the impact, ensuring that the flow channel of the liquid cooling plate 3 located above it is not squeezed or deformed.

[0065] Specifically, the insulation layer 5 includes a contoured foam board with a grooved structure to fill the recessed features between the flow channels of the liquid cooling plate 3 and completely cover the entire area of ​​the liquid cooling plate 3. In the event of an impact, the contoured foam board can effectively absorb the impact and further ensure that the flow channels of the liquid cooling plate 3 above it are not squeezed or deformed.

[0066] Furthermore, it enables the conformal foam board to be completely attached to the liquid cooling plate 3, thereby enabling the conformal foam board to provide full and complete flexible protection for the liquid cooling plate 3 at the bottom.

[0067] In order to enhance the structural strength of the bottom protection plate 4 and to ensure that the sealing performance of the battery pack sealing cavity above the bottom protection plate 4 is not affected by minor impacts, the bottom protection plate 4 includes a profile bottom protection plate 4 with a double-layer plate cavity structure, which can form a collision protection cavity below the battery pack sealing cavity.

[0068] The profile bottom guard plate 4 includes a profile top plate 41, a profile bottom plate 42, and a diagonal rib 43 disposed between the profile top plate 41 and the profile bottom plate 42. The diagonal rib 43 is mainly used to form a structural support between the profile top plate 41 and the profile bottom plate 42, which can provide a certain support strength and enhance the anti-deformation performance after collision from another angle.

[0069] From a functional installation perspective, the foam board is sandwiched between the top plate 41 of the profile and the liquid cooling plate 3, so that the foam board can form a flexible buffer between the bottom protection plate 4 and the liquid cooling plate 3. After the bottom protection plate 4 in the form of the profile bottom protection plate provides the lowest rigid protection in the sealed cavity of the battery pack, the foam board can provide effective and reliable flexible protection for the liquid cooling plate 3.

[0070] In terms of specific composition, the overall bottom guard plate 4 consists of three profile bottom guard plates 4 welded together. The profile bottom guard plate 4 is locked and attached to the box beam 1 by sealing connectors, which include rivet nuts 6, rivet bolts 7 and sealing plugs 8.

[0071] Furthermore, the cylindrical part of the rivet nut 6 is sealed and passed through the liquid cooling plate 3 and then riveted to the box beam 1. This achieves the fixation of the rivet nut 6 to the box beam 1 through the riveting process. After the rivet nut 6 is fixed to the box beam 1, its structural characteristics give it good sealing performance at the connection point. Therefore, after the bottom guard plate 4 is locked to the box beam 1, especially after the rivet nut 6 passes through the liquid cooling plate 3, it will not affect the internal sealing performance of the battery pack sealing cavity.

[0072] After the cylindrical 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 cylindrical 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 with the bottom guard plate 4. At the same time, it can facilitate the formation of a support gap between the bottom guard plate 4 and the liquid cooling plate 3, and thus better form a structural anti-collision protection cavity through the support gap.

[0073] The profile bottom guard plate 4 is fastened to the box beam 1 by rivet bolts 7. After the rivet nut 6 is fastened to the box beam 1, the rivet bolt 7 passes through the profile top plate 41 and is screwed into the cylinder of the rivet nut 6. Specifically, after the rivet bolt 7 passes through the profile top plate 41, it is threaded into the inside of the cylinder of the rivet nut 6, so that the bottom guard plate 4 is fixedly installed by the rivet bolt 7.

[0074] If the bottom of the power battery is scratched, and the rivet bolt 7 is scratched, the rivet bolt 7 may be damaged by the force and the sealing of the rivet nut 6 may be destroyed. At this time, the airtightness of the entire battery pack will fail because of the rivet bolt 7 of the bottom protective plate 4 of the profile.

[0075] Therefore, based on the collision risk of the rivet bolt 7, this disclosure avoids the risk of damage to the sealing cavity by concealing the rivet bolt 7 with a countersunk hole, that is, by setting the rivet bolt 7 to a non-bottom lowest point, and by protecting the installation part of the rivet bolt 7.

[0076] Based on the double-layer structure of the profile bottom cover plate 4, the locking interface of the rivet bolt 7 is the upper surface of the profile bottom cover 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 the bolt head of the rivet bolt 7 is hidden inside the profile bottom cover plate 4. This will realize the hidden installation of the rivet bolt 7 on the bottom cover plate 4, reducing the risk of exposed impact damage to the sealed cavity of the entire battery pack.

[0077] Meanwhile, in order to further protect the rivet bolt 7, the sealing plug 8 is installed at the opening of the profile base plate 42 and is opposite to the connection point of the rivet bolt 7. By adding the plastic sealing plug 8, the rivet bolt 7 is completely sealed in the form of a snap, thereby maximizing the protection performance.

[0078] Based on the overall structure of the battery pack, the box beam 1 consists of multiple parts assembled separately. The overlap between each box beam 1 is welded together. The welded 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 together isolate the anti-scratch bottom cavity 11.

[0079] The bottom of the lap joint between the box beams 1 is provided with a welded joint 93 that communicates with the anti-scratch bottom cavity 11, and a sealing block 94 is installed on the welded joint 93.

[0080] Referring to Figure 7, taking the structure at the left front corner of the power battery as an example, since all four box beams 1 are equipped with anti-scratch bottom cavities 11, when each box beam 1 is welded and assembled into a whole box, the overlap of each box beam 1 requires welding space due to the internal weld 91. Therefore, there will be a weld break 93 at the end of each box beam 1's anti-scratch bottom cavity 11. The internal weld 91 welds the overlap of the two anti-scratch bottom cavities 11 on the inner upper surface, which is the core of ensuring that the anti-scratch bottom cavity 11 does not affect the airtightness of the whole box, making the anti-scratch bottom cavity 11 completely independent of the airtightness of the whole box.

[0081] To prevent foreign objects from entering the independent anti-scratch cavity 11 and to ensure the overall aesthetics of the package, a sealing block 94 is added at the welded joint 93 and welded to the box beam 1 to ensure the airtightness of the anti-scratch cavity 11. The sealing block 94 can be an integral extrusion or casting to facilitate welding installation.

[0082] In this disclosure, the power battery housing cover 2 is bolted to the housing beam 1, the liquid cooling plate 3 is bolted to the housing beam 1 by FDS flow drill screws 31, and the conformal foam board is pasted to the liquid cooling plate 3 by adhesive backing; the profile bottom guard plate 4 is bolted to the housing beam 1 by rivet bolts 7.

[0083] The box beam 1, liquid cooling plate 3, conformal foam and profile bottom guard plate 4 constitute the main structure for bottom protection of the power battery disclosed herein, and the space formed by the box cover 2, box beam 1 and liquid cooling plate 3 is the internal sealed cavity of the power battery.

[0084] The bottom protective structure of the power battery can enhance the protection performance of the internal sealed cavity of the power battery from different angles, directions and details, and ensure that the internal sealed cavity of the power battery has good sealing performance, thereby avoiding safety risks to the greatest extent.

[0085] In order to form a seal between the bottom guard plate 4 and the box beam 1, the connecting parts between the bottom guard plate 4 and the box beam 1 include a first connecting part located at the edge and a second connecting part located in the middle.

[0086] 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 respectively.

[0087] The first rivet nut 61 and the first rivet bolt 71 constitute the aforementioned first connecting member, which is provided at the edge of the box beam 1 and the bottom guard plate 4. An elastic sealing strip 10 is provided between the edge of the box beam 1 and the bottom guard plate 4. A rigid limiting part 20 is provided between the box beam 1 and the bottom guard plate 4. The thickness of the rigid limiting part 20 is 2 / 5 to 3 / 5 of the thickness of the elastic sealing strip 10 in its natural state.

[0088] By setting the elastic sealing strip 10 at least around the edge of the box beam 1, the gap between the bottom guard plate 4 and the box beam 1 can be effectively sealed by the elastic sealing strip 10, thereby forming a sealing interface between the bottom guard plate 4 and the box beam 1.

[0089] On the other hand, by setting a rigid limiting part 20 with a thickness less than the thickness of the elastic sealing strip 10 in its natural state between the bottom guard plate 4 and the box beam 1, the elastic compression of the elastic sealing strip 10 can be limited, effectively preventing the elastic sealing strip 10 from failing due to overpressure, and ensuring the effectiveness and stability of the sealing interface between the bottom guard plate 4 and the box beam 1.

[0090] With the thickness of the rigid limiting part 20 being 2 / 5 to 3 / 5 of the thickness of the elastic sealing strip 10 in its natural state, it is possible to ensure that the elastic sealing strip 10 can achieve optimal sealing performance when pressed between the bottom guard plate 4 and the box beam 1.

[0091] In addition to the aforementioned edge sealing connection, the second rivet nut 62 and the second rivet bolt 72 are located in the middle of the box beam 1 and the bottom guard plate 4, forming the second connecting piece described above located in the middle of the box beam 1 and the bottom guard plate 4. From the perspective of sealing connection, an elastic sealing gasket 30 and a rigid gasket 40 are provided between the box beam 1 and the bottom guard plate 4. The second rivet bolt 72 passes through the elastic sealing gasket 30 and the rigid gasket 40. The rigid gasket 40 is located on the radial outer side 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 its natural state.

[0092] Furthermore, the rigid gasket 40 has the same head size as the second rivet bolt 72, and the head of the second rivet bolt 72 can completely cover the elastic sealing gasket 30. With 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 its 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. This ensures that while the second rivet bolt 72 is locked to the box beam 1, the elastic sealing gasket 30 is not over-compressed, which would lead to sealing failure. This effectively ensures the sealing effectiveness of the second rivet bolt 72 in the cavity of the bottom guard plate 4.

[0093] The elastic sealing strip 10 and elastic sealing gasket 30 provided above can further seal the edge and middle parts of the bottom guard plate 4, effectively sealing the connection or joint between the bottom guard plate 4 and the box beam 1. They can also further seal the gap between the box beam 1 and the bottom guard plate 4 above the bottom guard plate 4, as well as the through hole gap formed by the connection point of the rivet bolts 7 at the top plate 41 of the profile, thereby enhancing the sealing effect.

[0094] The aforementioned sealing parts and the resulting sealed protective cavity can prevent mud and sand impurities from entering between the bottom protective plate 4 and the liquid cooling plate 3 during daily use, effectively avoiding the risk of corrosion to the liquid cooling plate 3.

[0095] The power battery disclosed herein has an additional anti-scratch bottom cavity 11 below the housing beam 1, which can effectively improve the overall pack's anti-scratch capability. The anti-scratch bottom cavity 11 is isolated from the internal cavity of the pack, so even if there is a collision or damage, it will not affect the overall pack's airtightness.

[0096] The bottom guard plate 4 is made of aluminum profile, which can effectively improve the bottom impact resistance. The locking bolt of the bottom guard plate 4 is hidden to ensure that scratches will not damage the structure and airtightness of the rivet nut 6, thus ensuring that even if the bottom is slightly scratched, the airtightness of the whole bag will not fail.

[0097] A thermal insulation layer 5 (which can be a contoured foam board) is filled between the bottom protective plate 4 and the liquid cooling plate 3. When an impact occurs, the contoured foam board inside can effectively absorb the impact and ensure that the flow channel of the liquid cooling plate 3 is not squeezed and deformed.

[0098] Each box beam 1 independent cavity is sealed by welding with sealing blocks 94 to prevent foreign objects from entering the anti-scratch cavity.

[0099] Due to the presence of the conformal foam plate, the height between the liquid cooling plate 3 and the bottom protective plate 4 forms a protective cavity that is completely independent of the airtightness of the entire battery pack. At the same time, the cavity of the bottom protective plate 4 itself also constitutes a certain protective cavity, ensuring that the sealed cavity of the entire battery pack is fully and effectively protected.

[0100] The power battery disclosed herein specifically includes three chambers: a sealed battery pack chamber, a circumferential anti-scratch bottom chamber 11, and a sealed protective chamber from the liquid cooling plate 3 to the bottom protective plate 4. Even if the anti-scratch bottom chamber 11 or one of the sealed protective chambers, or even both chambers, are damaged at the same time, the integrity of the sealed battery pack chamber will not be affected, thus maximizing the all-round protection of the entire battery pack.

[0101] Furthermore, this disclosure also provides a sealing cavity for use inside a power battery. Referring to Figures 8 to 11, an embodiment of this disclosure provides a sealing cavity. Specifically, the power battery includes a housing 12 and a bottom protective plate 4 disposed opposite each other along a first direction F1. The sealing cavity is used to connect the housing 12 and the bottom protective plate 4. The sealing cavity includes an edge sealing assembly 13, which includes a first elastic sealing portion 311, a rigid limiting portion 20, and a first connecting bolt 312. The first elastic sealing portion 311 is disposed at least around the edge of the housing 12. The first connecting bolt 312 sequentially passes through the bottom protective plate 4 along the first direction F1 and is threadedly connected to the housing 12. The first elastic sealing portion 311 is press-fitted between the bottom protective plate 4 and the housing 12. The rigid limiting portion 20 is disposed between the bottom protective plate 4 and the housing 12, and the size of the rigid limiting portion 20 in the first direction F1 is smaller than the size of the first elastic sealing portion 311 in its naturally extended state.

[0102] According to the sealing cavity provided by the above technical features, on the one hand, the first elastic sealing part 311 is arranged at least around the edge of the housing 12, and is threadedly connected to the housing 12 through the bottom guard plate 4 in sequence along the first direction F1 by the first connecting bolt 312, so that the first elastic sealing part 311 is pressed between the bottom guard plate 4 and the housing 12, thereby effectively sealing the gap between the bottom guard plate 4 and the housing 12, thus forming a sealing interface between the bottom guard plate 4 and the housing 12; on the other hand, a rigid limiting part 20 with a size smaller than the size of the first elastic sealing part 311 in the natural elongation state is provided between the bottom guard plate 4 and the housing 12 in the first direction F1, thereby limiting the compression of the first elastic sealing part 311, effectively avoiding the failure of the first elastic sealing part 311 due to overpressure, and ensuring the effectiveness and stability of the sealing interface between the bottom guard plate 4 and the housing 12.

[0103] As shown in Figures 8, 10 and 11, F1 shown in the figures can be an example of the first direction F1 described above.

[0104] Preferably, as shown in FIG10, the dimension of the first elastic sealing part 311 in the first direction F1 in its natural state can be h, and the dimension of the rigid limiting part 20 in the first direction F1 can be 0.4h to 0.6h, so as to ensure that the first elastic sealing part 311 can be in the optimal sealing performance when pressed between the bottom guard plate 4 and the housing 12. It should be noted that in FIG10, in order to clarify the dimensional relationship between the first elastic sealing part 311 and the rigid limiting part 20, the first elastic sealing part 311 shown in the figure is in the form of the first elastic sealing part 311 in its naturally extended state. In fact, in the assembly drawing of the edge sealing assembly 13 shown in FIG10, the first elastic sealing part 311 should be pressed between the housing 12 and the bottom guard plate 4, and its compressed dimension in the first direction F1 should be equal to the dimension of the rigid limiting part 20 in the first direction F1.

[0105] Preferably, the first elastic sealing part 311 may be a sealing strip (e.g., sealing rubber strip, sealing silicone strip or other sealing strip) provided along the edge of the housing 12.

[0106] Optionally, the edges of the housing 12 and / or the bottom guard plate 4 may be provided with an embedding groove, and the first elastic sealing part 311 may be disposed in the embedding groove to facilitate the limiting and fixing of the first elastic sealing part 311.

[0107] Optionally, as shown in Figure 10, a first rivet nut 61 that cooperates with the first connecting bolt 312 may be embedded in the housing 12, so that the housing 12 and the first connecting bolt 312 can be threadedly connected through the first rivet nut 61 and the first connecting bolt 312.

[0108] It should be noted that the threaded hole of the housing 12 connected to the first connecting bolt 312 is not limited to the way of embedding the first rivet nut 61 on the housing 12. As long as the housing 12 can be provided with an internal threaded hole that mates with the first connecting bolt 312, the internal threaded hole can also be formed by direct machining on the housing 12.

[0109] Preferably, as shown in Figure 9, there are multiple first connecting bolts 312, and the multiple first connecting bolts 312 are spaced apart along the edge of the housing 12 to ensure the fixing stability and sealing of the bottom guard plate 4.

[0110] Preferably, as shown in FIG10, each first connecting bolt 312 is provided with a rigid limiting part 20. In this way, by directly fitting the rigid limiting part 20 onto the first connecting bolt 312, the limiting accuracy and sensitivity of the rigid limiting part 20 are effectively provided, and the over-tightening of the first connecting bolt 312 and the first rivet nut 61 is effectively avoided, which would cause the bottom guard plate 4 to be recessed at the location of the first connecting bolt 312.

[0111] Preferably, as shown in FIG10, the rigid limiting part 20 may be a rigid sleeve so as to be fitted onto the first connecting bolt 312.

[0112] Optionally, as shown in FIG10, the rigid limiting part 20 may also be a plurality of rigid pads stacked along the first direction F1. In this way, the size of the rigid limiting part 20 in the first direction F1 can be adjusted by adjusting the number or thickness of the rigid pads. This effectively improves the adaptability and versatility of the rigid limiting part 20.

[0113] Preferably, as shown in FIG10, the bottom protective plate 4 may be provided with a first countersunk hole, and the nut of the first connecting bolt 312 may be embedded in the first countersunk hole to ensure the flatness of the bottom protective plate 4.

[0114] Optionally, as shown in Figures 10 and 11, the bottom protective plate 4 may include an outer protective plate 44 and an inner lining plate 45 facing each other along a first direction. The outer protective plate 44 and the inner lining plate 45 are fixedly connected by stiffeners, so that the double-layer plate profile structure formed by the outer protective plate 44 and the inner lining plate 45 can effectively improve the load-bearing strength of the bottom protective plate 4. When the bottom protective plate 4 is connected to the housing 12, the inner lining plate 45 is positioned closer to the housing 12 than the outer protective plate 44. The first countersunk hole may be provided between the outer protective plate 44 and the inner lining plate 45 to conceal the nut of the first connecting bolt 312.

[0115] In the embodiment, as shown in Figures 9 and 11, the sealing cavity may further include a central sealing component 32. The central sealing component 32 can be used to connect the middle part of the housing 12 and the middle part of the bottom protective plate 4 to further increase the connection points between the bottom protective plate 4 and the housing 12, thereby improving the connection stability between the bottom protective plate 4 and the housing 12 and preventing the bottom protective plate 4 from deforming in the middle under the influence of gravity.

[0116] It should be noted that the dotted-line box shown in Figure 9 divides the edge and the middle of the box 12. In other words, the part of the box 12 located inside the dotted-line box is connected to the bottom guard plate 4 by the middle sealing component 32, and the part of the box 12 located outside the dotted-line box is connected to the bottom guard plate 4 by the edge sealing component 13.

[0117] Preferably, as shown in FIG11, the middle sealing assembly 32 may include a second elastic sealing part 321, a rigid gasket 40, and a second connecting bolt 322. The second connecting bolt 322 passes through the second elastic sealing part 321 and the bottom guard plate 4 in sequence along the first direction F1, and the second connecting bolt 322 is threadedly connected to the housing 12.

[0118] Preferably, as shown in FIG11, both the rigid gasket 40 and the second elastic sealing part 321 are disposed between the nut of the second connecting bolt 322 and the bottom cover plate 4. The rigid gasket 40 and the second elastic sealing part 321 are aligned with each other in the first direction F1, and the size of the rigid gasket 40 is smaller than the size of the second elastic sealing part 321 in the first direction F1. In this way, not only is the hole through which the second connecting bolt 322 passes through the bottom cover plate 4 sealed by the second elastic sealing part 321, but also the rigid gasket 40, which is aligned with the second elastic sealing part 321 in the first direction F1, is disposed between the nut of the second connecting bolt 322 and the bottom cover plate 2, and the rigid gasket 40 is disposed between them in the first direction F1. The size of the second elastic sealing part 321 is set to be smaller than the size of the second elastic sealing part 321 in its natural state. This allows the rigid gasket 40 to limit the maximum compression of the second elastic sealing part 321 without hindering its compression sealing. This ensures the uniformity of the tightening degree between the second connecting bolt 322 and the housing 12, while effectively preventing the second elastic sealing part 321 from over-compressing and failing due to excessive tightening of the second connecting bolt 322 and the housing 12. This effectively ensures the sealing effectiveness of the second elastic sealing part 321.

[0119] Optionally, the second elastic sealing part 321 may be a sealing gasket (e.g., a rubber gasket, a silicone gasket, or other sealing gaskets).

[0120] Similarly, as shown in Figure 11, a second rivet nut 62 that cooperates with the second connecting bolt 322 can also be embedded in the middle of the box 12, so that the box 12 and the second connecting bolt 322 can be threadedly connected through the second rivet nut 62 and the second connecting bolt 322.

[0121] It should be noted that the threaded hole of the housing 12 connected to the second connecting bolt 322 is not limited to the way of embedding the second rivet nut 62 on the housing 12. As long as the housing 12 can be provided with an internal threaded hole that mates with the second connecting bolt 322, the internal threaded hole can also be formed by direct machining on the housing 12.

[0122] Preferably, as shown in FIG11, the rigid washer 40 is sleeved on the outside of the second connecting bolt 322 to ensure the uniformity of the force applied by the rigid washer 40 in the circumferential direction of the nut of the second connecting bolt 322.

[0123] Preferably, as shown in FIG11, an example is shown where the rigid gasket 40 is fitted onto the outside of the second elastic sealing portion 321. In this way, the rigid gasket 40 can protect the second elastic sealing portion 321 and prevent damage to it during assembly. However, this is not the only limitation. As long as the through hole of the bottom guard plate 4 for the second connecting bolt 322 can be sealed, the second elastic sealing portion 321 is not limited to the example shown in FIG11. For example, not shown in the figure, the second elastic sealing portion can also be fitted onto the outside of the rigid gasket.

[0124] Optionally, the rigid gasket 40 can be a metal gasket to ensure the compressive strength of the rigid gasket 40.

[0125] Preferably, as shown in FIG11, the bottom protective plate 4 may be provided with a second countersunk hole, and the nut of the second connecting bolt 322 may be embedded in the second countersunk hole to ensure the flatness of the bottom protective plate 4. Similarly, the second countersunk hole may also be provided between the outer protective plate 44 and the inner plate 45 to facilitate the concealment of the nut of the second connecting bolt 322.

[0126] As shown in Figures 10 and 11, the aforementioned power battery may further include a liquid cooling plate 3 disposed between the housing 12 and the bottom protective plate 4. Preferably, the first connecting bolt 312 passes through the bottom protective plate 4 and the liquid cooling plate 3 sequentially along the first direction F1, and the first connecting bolt 312 is threadedly connected to the housing 12 to accommodate a power battery in which the liquid cooling plate 3 is disposed at the bottom of the housing 12.

[0127] Correspondingly, the second connecting bolt 322 can also pass through the bottom guard plate 4 and the liquid cooling plate 3 in sequence, and the first connecting bolt 312 is threadedly connected to the housing 12, so as to improve the connection stability between the housing 12 of the power battery and the bottom guard plate 4 where the liquid cooling plate 3 is set at the bottom of the housing 12.

[0128] Optionally, the liquid cooling plate 3 can be fixedly connected to the housing 12 via a hot-melt process.

[0129] Preferably, as shown in FIG8, the power battery may further include a heat insulation layer 5, which may be disposed between the bottom protective plate 4 and the liquid cooling plate 3 to insulate the liquid cooling plate 3 and improve the cooling effect of the liquid cooling plate 3.

[0130] This disclosure also provides a vehicle including the aforementioned power battery, wherein by installing the power battery in an electric vehicle, the vehicle quality of the electric vehicle can be greatly improved and driving safety enhanced.

[0131] It should be noted that, where there is no conflict, the features in the embodiments of this disclosure can be combined with each other.

[0132] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A power battery, comprising a housing beam and an internal sealed cavity of the power battery, wherein the housing beam is provided with an anti-scratch bottom cavity, the anti-scratch bottom cavity being independently provided and sealed and isolated from the internal sealed cavity of the power battery; The anti-scratch bottom cavity is located 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, wherein a box cover and a liquid cooling plate are installed on the box beam, and the space enclosed by the box cover, the liquid cooling plate and the box beam constitutes the internal sealed cavity of the power battery; The liquid cooling plate is provided with a bottom protective plate at its lower part, and the anti-scratch bottom cavity is provided on the circumferential periphery of the bottom protective plate.

3. The power battery according to claim 2, wherein the housing beam is disposed in the circumferential direction of the power battery, the anti-scratching bottom cavity is disposed in the lower part of the liquid cooling plate mounting plane, and the bottom guard plate is disposed in the radial inner side of the anti-scratching bottom cavity.

4. The power battery according to claim 2, wherein the bottom protective plate is installed below the liquid cooling plate, and a heat insulation layer is provided between the liquid cooling plate and the bottom protective plate, the heat insulation layer including a contoured foam board, the contoured foam board including a grooved structure to enable the contoured foam board to be completely attached to the liquid cooling plate.

5. The power battery according to claim 4, wherein the bottom protection plate comprises a profile bottom protection plate with a double-layer plate cavity structure, the profile bottom protection plate comprises a profile top plate, a profile bottom plate and an inclined rib disposed between the profile top plate and the profile bottom plate, and the foam board is sandwiched between the profile top plate and the liquid cooling plate.

6. The power battery according to claim 5, wherein the bottom protective plate is locked and attached to the housing beam by a sealing connector, the sealing connector including a rivet nut, a rivet bolt and a sealing plug, the cylindrical part of the rivet nut passes through the liquid cooling plate and is then riveted and fixed to the housing beam, and the nut part of the rivet nut is exposed in the gap between the bottom protective plate and the liquid cooling plate.

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

8. The power battery according to claim 2, wherein the housing beam comprises multiple separately assembled pieces, and the overlap between each housing beam is welded together. The welded part includes an external weld exposed on the housing beam and an internal weld opposite to the position of the external weld. The external weld and the internal weld together isolate the anti-scratch bottom cavity. The bottom of the lap joint between the box beams is provided with a welded joint that communicates with the anti-scratch bottom cavity, and a sealing block is installed on the welded joint.

9. The power battery according to claim 6, wherein the liquid cooling plate is fixedly attached to the housing beam by a flow drill screw; The rivet nut includes a first rivet nut and a second rivet nut, and the rivet bolt includes a corresponding first rivet bolt and a second rivet bolt. The first rivet nut and the first rivet bolt are disposed on the edges of the box beam and the bottom guard plate, and an elastic sealing strip is disposed between the edges of the box beam and the bottom guard plate. A rigid limiting part is disposed between the box beam and the bottom guard plate, and the thickness of the rigid limiting part is 2 / 5 to 3 / 5 of the thickness of the elastic sealing strip in its natural state. The second rivet nut and the second rivet bolt are disposed in the middle of the box beam and the bottom guard plate. An elastic sealing gasket and a rigid gasket are disposed between the box beam and the bottom guard plate. The second rivet bolt passes through the elastic sealing gasket and the rigid gasket. The rigid gasket is disposed on the radial outer side of the elastic sealing gasket, and the thickness of the rigid gasket is less than the thickness of the elastic sealing gasket in its natural state.

10. The power battery according to claim 1, wherein the power battery includes a housing and a bottom protective plate arranged facing each other along a first direction, the sealing cavity is used to connect the housing and the bottom protective plate, the sealing cavity includes an edge sealing assembly, the edge sealing assembly includes a first elastic sealing part, a rigid limiting part and a first connecting bolt, the first elastic sealing part is arranged at least around the edge of the housing; The first connecting bolt passes through the bottom guard plate and is threaded to the box body along the first direction, and the first elastic sealing part is press-fitted between the bottom guard plate and the box body; The rigid limiting part is disposed on the bottom guard plate and the box body, and the size of the rigid limiting part in the first direction is smaller than the size of the first elastic sealing part in its natural elongation state.

11. The power battery according to claim 10, wherein the dimension of the first elastic sealing portion in the first direction under natural conditions is h, and the dimension of the rigid limiting portion in the first direction is 0.4h to 0.6h.

12. The power battery according to claim 10, wherein the number of the first connecting bolts is multiple, and the multiple first connecting bolts are spaced apart along the edge of the housing; each of the first connecting bolts is fitted with the rigid limiting part.

13. The power battery according to any one of claims 10 to 12, wherein the sealed cavity further comprises a central sealing assembly, the central sealing assembly being used to connect the central part of the housing and the central part of the bottom protective plate; The central sealing assembly includes a second elastic sealing part, a rigid gasket, and a second connecting bolt. The second connecting bolt passes through the second elastic sealing part and the bottom protective plate in sequence along the first direction, and the second connecting bolt is threadedly connected to the housing. Both the rigid gasket and the second elastic sealing part are placed between the nut of the second connecting bolt and the bottom protective plate; The rigid gasket and the second elastic sealing part are aligned with each other in the first direction, and in the first direction, the size of the rigid gasket is smaller than the size of the second elastic sealing part in its natural state.

14. The power battery according to claim 13, wherein the bottom protective plate is provided with a countersunk hole, and the nut of the first connecting bolt or the second connecting bolt is embedded in the countersunk hole; The rigid gasket is fitted onto the outside of the second connecting bolt; or, the rigid gasket is fitted onto the outside of the second elastic sealing part.

15. A vehicle comprising the power battery according to any one of claims 1-14.

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