Battery pack assembly and vehicle

Abstract

The invention provides a battery pack assembly and a vehicle, and the battery pack assembly comprises an upper cover and a bottom protection plate which are buckled with each other, and the buckling part of the upper cover and the bottom protection plate is sealed through a sealing ring to define a mounting space; the module support and the battery module are located in the installation space, the module support is installed on the upper cover, and the battery module is installed on the module support; after the battery module is installed on an automobile body, the upper cover, the module support, the battery module and the bottom protection plate are sequentially arranged from high to low in the height direction, and a gap is reserved between the battery module and the bottom protection plate in the height direction. A first flue gas discharge hole is formed in the bottom of the battery module, and a second flue gas discharge hole is formed in the bottom protection plate. According to the battery pack assembly provided by the invention, the number of parts is reduced, the weight and the cost are reduced, a certain vertical space is saved, the production process of the box body is simplified, and the maintenance convenience of the battery pack is improved; and meanwhile, a space and a channel for discharging flue gas are provided, so that explosion accidents caused by rapid expansion of the battery pack due to small flue gas discharging space and unsmooth flue gas discharging of the battery pack are avoided.

Description

Technical Field

[0001] The present application relates to the field of power battery technology, and in particular to a battery pack assembly and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, power batteries, as their core components, have received increasing attention because their performance directly affects the vehicle's range, safety and cost.

[0003] At present, power battery packs generally use bottom trays and auxiliary structures to support battery modules. These have the problems of heavy weight, many parts, large vertical space occupation, complex box production process, inconvenient battery pack maintenance, and high cost, which restrict the growth of battery life of new energy vehicles. Moreover, the smoke and exhaust channels of the battery module are set above the battery module. When the battery pack has thermal runaway, the smoke is discharged upward, posing a major safety hazard. In addition, there is a lack of vertical smoke discharge buffer space inside the battery pack, which makes it easy for the battery pack to explode when thermal runaway occurs. Summary of the Invention

[0004] The present application provides a battery pack assembly and a vehicle to solve the problems existing in the prior art, reduce the number of parts, reduce weight and cost, save a certain amount of vertical space, simplify the box production process, and improve the convenience of battery pack maintenance; at the same time, provide space and channels for smoke exhaust to avoid explosion accidents caused by rapid expansion of the battery pack due to small smoke exhaust space and poor smoke exhaust.

[0005] The battery pack assembly provided in the present application includes: an upper cover and a bottom guard plate that are interlocked with each other, and the upper cover and the bottom guard plate are sealed at the interlocking point by a sealing ring to define an installation space; a module bracket and a battery module located in the installation space, and the module bracket is installed on the inner top wall of the upper cover, and the battery module is installed on the module bracket; after being installed on the vehicle body, the upper cover, the module bracket, the battery module and the bottom guard plate are arranged in sequence from high to low in the height direction, and a distance is left between the battery module and the bottom guard plate in the height direction; a first smoke exhaust hole is provided at the bottom of the battery module, and a second smoke exhaust hole is provided on the bottom guard plate.

[0006] Optionally, the module bracket includes a supporting longitudinal beam and a supporting cross beam; the supporting longitudinal beam includes an inner longitudinal beam and two groups of outer longitudinal beams respectively arranged on both sides of the inner longitudinal beam; the supporting cross beam is connected to the ends of the inner longitudinal beam and the two groups of outer longitudinal beams.

[0007] Optionally, the battery disconnect unit is mounted on the upper cover and is spaced apart from the bottom guard plate in a height direction.

[0008] Optionally, the supporting longitudinal beam also includes two transfer longitudinal beams connected to the supporting cross beam, the transfer longitudinal beams are connected to the side of the supporting cross beam facing away from the inner longitudinal beam, and the ends of the two transfer longitudinal beams are both abutted against the inner wall of the upper cover; a space for installing the battery disconnect unit is defined between the supporting cross beam, the two transfer longitudinal beams and the inner wall of the upper cover.

[0009] Optionally, the battery pack assembly also includes a reinforcing bracket and a front adapter bracket; the reinforcing bracket is located at the inner front of the upper cover, and the two side walls of the reinforcing bracket are respectively and one-to-one connected to the inner front of the upper cover and the inner longitudinal beam; the front adapter bracket is located at the outer front of the upper cover, and the front adapter bracket is used to be installed on the vehicle body, and the front adapter bracket is arranged opposite to the reinforcing bracket and is connected by a fixing part that passes through the reinforcing bracket, the upper cover, and the front adapter bracket.

[0010] Optionally, the battery pack assembly further includes a rear adapter bracket; the rear adapter bracket is mounted on the outer rear portion of the upper cover, and the rear adapter bracket is used to be mounted on a vehicle body.

[0011] Optionally, a one-way smoke exhaust valve is installed on each of the first smoke exhaust hole and the second smoke exhaust hole, and the opening pressure of the one-way smoke exhaust valve is adjustable.

[0012] Optionally, the battery module further includes a module mounting bolt, one end of which is located outside the battery module, and the other end of which is passed through the battery module from the bottom of the battery module and fastened to the floating nut of the module bracket.

[0013] Optionally, the bottom guard plate is integrally formed by stamping steel, and the upper cover is stamped by aluminum alloy.

[0014] The present application also provides a vehicle, comprising a body sheet metal, a body fastening bolt and the battery pack assembly described in any one of the above embodiments; the body fastening bolt passes through the battery pack assembly from the bottom of the battery pack assembly and is fastened to the body sheet metal through a body fastening nut.

[0015] The above technical solution has the following beneficial effects: The battery pack assembly and vehicle provided in the present application realize an inverted installation design of the battery module and the module bracket by invertedly installing the module bracket on the upper cover of the battery pack and installing the battery module on the module bracket. Compared with conventional technical solutions, there is no need to set an aluminum profile battery tray and related accessories to support the battery module, which reduces the number of parts, reduces weight and cost, saves a certain amount of vertical space, simplifies the box production process, and improves the convenience of battery pack maintenance; the first smoke exhaust hole is set at the bottom of the battery module and the second smoke exhaust hole is set on the bottom guard plate to jointly discharge the smoke out of the battery pack. The vertical space saved between the battery module and the bottom guard plate is used to provide space and channels for smoke exhaust, which can provide a certain buffer space in the event of thermal runaway, avoiding explosion accidents caused by rapid expansion of the battery pack due to small smoke exhaust space and poor smoke exhaust. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present application, wherein: Figure 1 A schematic structural diagram of a battery pack assembly provided for an optional embodiment of the present application.

[0017] Figure 2 A top view of the battery pack assembly provided in an optional embodiment of the present application after being installed on the vehicle body.

[0018] Figure 3 A bottom view of the battery pack assembly provided in an optional embodiment of the present application after being installed on the vehicle body.

[0019] Figure 4 An exploded view of a battery pack assembly provided for an optional embodiment of the present application.

[0020] Figure 5 A partial longitudinal cross-sectional view of a battery pack assembly provided in an optional embodiment of the present application.

[0021] Figure 6 An exploded view of the upper cover, sealing ring and bottom guard plate in the battery pack assembly provided in an optional embodiment of the present application.

[0022] Figure 7 This is a structural diagram of an optional embodiment of the present application in which the module bracket is arranged on the upper cover.

[0023] Figure 8 A longitudinal view of the battery pack assembly provided in an optional embodiment of the present application installed on a vehicle body.

[0024] Description of reference numerals: 1-upper cover, 10-sealing ring, 11-first flange; 2-module bracket, 20-support longitudinal beam, 200-inner longitudinal beam, 201-outer longitudinal beam, 202-transfer longitudinal beam, 21-support cross beam, 22-reinforcement bracket, 23-floating nut; 3-battery module, 30-module mounting bolts; 4- bottom guard plate, 40- second flange; 5-cooling unit, 50-water inlet, 51-water outlet; 6-Battery disconnect unit; 7-Front adapter bracket; 8-Rear adapter bracket; 9-body sheet metal, 90-body fastening bolts, 91-body fastening nuts. DETAILED DESCRIPTION

[0025] Down The technical solution of the present invention is further described in detail below through examples and in conjunction with the accompanying drawings. Directional terms such as "up," "down," "left," "right," "front," "back," "front," "back," "top," and "bottom" mentioned or potentially mentioned in this specification are defined relative to the configurations shown in the accompanying drawings. The terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may vary depending on the location and usage of the component. Therefore, these and other directional terms should not be construed as restrictive.

[0026] like Figures 1 to 5 As shown, the present application provides a battery pack assembly, including an interlocking upper cover 1 and a bottom guard plate 4, a module bracket 2 and a battery module 3.

[0027] like Figure 5 As shown, the upper cover 1 and the bottom guard plate 4 are sealed at the joint by a sealing ring 10 to define an installation space; the module bracket 2 and the battery module 3 are located in the installation space, the module bracket 2 is installed on the inner top wall of the upper cover 1, and the battery module 3 is installed on the module bracket 2 for positioning.

[0028] After being installed on the vehicle body, the upper cover 1, the module bracket 2, the battery module 3 and the bottom guard plate 4 are arranged in descending order along the height direction, and a distance is left between the battery module 3 and the bottom guard plate 4 along the height direction, such as Figure 5 As shown; a first smoke exhaust hole is provided at the bottom of the battery module 3, and a second smoke exhaust hole is provided on the bottom guard plate 4.

[0029] The first smoke exhaust port and the second smoke exhaust port may be arranged vertically opposite to each other, or may be arranged vertically staggered, and may be arranged specifically according to the needs of smoke exhaust.

[0030] like Figures 4 to 6 As shown, an opening is provided at the lower portion of the upper cover 1, and a first flange 11 extending outward is provided at the lower edge of the upper cover 1. An opening is provided at the upper portion of the bottom guard plate 4, and a second flange 40 extending outward is provided at the upper edge of the bottom guard plate 4. The first flange 11 and the second flange 40 are connected to each other and a sealing ring 10 is embedded circumferentially therebetween for sealing, which effectively optimizes the structure and components required for battery pack sealing, reduces redundant materials, improves production efficiency, and reduces costs.

[0031] After the battery pack is installed on the vehicle body, the cooling unit 5 in the thermal management system of the battery module 3 is located on the upper part of the battery module 3. Specifically, Figure 4 As shown, the liquid cooling plate of the cooling unit 5 is attached to the battery module 3, and the refrigerant circulates through the water inlet 50, the water outlet 51, and the cooling water pipe.

[0032] The battery pack assembly provided in the present application realizes an inverted installation design of the battery module 3 and the module bracket 2 by invertedly installing the module bracket 2 on the upper cover 1 of the battery pack and installing the battery module 3 on the module bracket 2 located above it. Compared with the conventional technical solution, there is no need to set an aluminum profile battery tray and related accessories to support the battery module 3, which reduces the number of parts, reduces weight and cost, saves a certain amount of vertical space, simplifies the box production process, and improves the convenience of battery pack maintenance; the first smoke exhaust hole is set at the bottom of the battery module 3 and the second smoke exhaust hole is set on the bottom guard plate 4 to jointly quickly discharge the smoke out of the battery pack, and utilizes the vertical space saved between the battery module 3 and the bottom guard plate 4 to provide space and channels for smoke exhaust, which can provide a certain buffer space in the event of thermal runaway, thereby avoiding explosion accidents caused by rapid expansion of the battery pack due to small smoke exhaust space and poor smoke exhaust.

[0033] In an optional embodiment, the module support 2 includes a supporting longitudinal beam 20 and a supporting cross beam 21; the supporting longitudinal beam 20 includes an inner longitudinal beam 200 and two sets of outer longitudinal beams 201 respectively arranged on both sides of the inner longitudinal beam 200; the supporting cross beam 21 is connected to the ends of the inner longitudinal beam 200 and the two sets of outer longitudinal beams 201. Figure 4 The inner longitudinal beam 200 supports the longitudinal inner side of the battery pack, the outer longitudinal beams 201 on both sides support the longitudinal outer side of the battery pack, and the supporting cross beam 21 supports the lateral direction of the battery pack. The supporting longitudinal beam 20 and the supporting cross beam 21 can be integrally formed or bolted to form a module bracket 2. The module bracket 2 supports the battery pack and resists mechanical shock and mechanical vibration.

[0034] In an optional embodiment, the battery disconnect unit 6 is mounted on the upper cover 1, and a distance is left between it and the bottom guard plate 4 in the height direction. The battery disconnect unit 6 (BDU, Battery Disconnect Unit) is a high-voltage protection component of the battery pack assembly, which is composed of sensors, actuators, controllers (electronic control units) and other components. It collects data such as voltage, current, temperature, etc. of the system, effectively manages and controls the charging and discharging of the battery pack, and responds to functional requirements at the vehicle level. The battery disconnect unit 6 is a conventional component of the battery pack, and its structure will not be described in detail. By fixing the battery disconnect unit 6 to the module bracket 2 or the inner top of the upper cover 1 with bolts, and leaving a vertical distance between it and the bottom guard plate 4, the space and channel required for smoke exhaust can be further increased.

[0035] In an optional embodiment, the supporting longitudinal beam 20 further includes two transition longitudinal beams 202 connected to the supporting cross beam 21. The transition longitudinal beams 202 are connected to the side of the supporting cross beam 21 facing away from the inner longitudinal beam 200. The ends of the two transition longitudinal beams 202 are both in contact with the inner side wall of the upper cover 1. The space for installing the battery disconnect unit 6 is defined between the supporting cross beam 21, the two transition longitudinal beams 202 and the inner side wall of the upper cover 1. Please refer to Figure 4 and Figure 7 The two transfer longitudinal beams 202 are connected to the supporting cross beam 21 to form a U-shaped structure. The opening of the U-shaped structure faces the inner wall of the upper cover 1 to form an annular installation space. The battery disconnect unit 6 is located on the inner side of the installation space. The annular installation space effectively protects the battery disconnect unit 6.

[0036] In an optional embodiment, the battery pack assembly further includes a reinforcing bracket 22 and a front adapter bracket 7; the reinforcing bracket 22 is located at the inner front portion of the upper cover 1, and the two side walls of the reinforcing bracket 22 are respectively connected to the inner front side of the upper cover 1 and the inner longitudinal beam 200 in a one-to-one correspondence; the front adapter bracket 7 is located at the outer front portion of the upper cover 1, and the front adapter bracket 7 is used to be installed on the vehicle body, and the front adapter bracket 7 is arranged opposite to the reinforcing bracket 22 and is connected by a fixing piece that passes through the reinforcing bracket 22, the upper cover 1, and the front adapter bracket 7. Please refer to Figure 4 and Figure 7 The fixing parts can be bolts. The two side walls of the reinforcing bracket 22 are respectively attached to the inner side beam 200 and the inner wall of the upper cover 1, and are fastened by bolts to transfer the force of the inner side beam 200 to the upper cover 1; the front adapter bracket 7 is located on the outside of the upper cover 1, and the bolts passing through the reinforcing bracket 22, the upper cover 1 and the front adapter bracket 7 in sequence are used to receive the force of the upper cover 1 and transmit it to the vehicle body, thereby reducing the deformation of the battery pack after being subjected to force and protecting the battery pack.

[0037] It should be noted that the front part in the embodiment of the present application refers to the front part along the direction of the vehicle body after the battery pack assembly is installed on the vehicle body.

[0038] In an optional embodiment of the reinforcing bracket 22 and the front adapter bracket 7, as shown in FIG. Figure 4 and Figure 7 As shown, the reinforcing bracket 22 is in the shape of a triangular prism, and the two perpendicular side walls are respectively affixed to the inner longitudinal beam 200 and the inner front part of the upper cover 1, and the side walls affixed to the inner longitudinal beam 200 are fastened by bolts; the front adapter bracket 7 is L-shaped, including connected horizontal walls and vertical walls, the horizontal walls are used to be connected to the body sheet metal by bolts, and the vertical walls are affixed to the outer side of the upper cover 1 and face away from the reinforcing bracket 22. The bolts are sequentially passed through the vertical walls of the front adapter bracket 7, the side walls of the upper cover 1, and the part of the reinforcing bracket 22 affixed to the upper cover 1, and then fastened by nuts.

[0039] Furthermore, there are two reinforcing brackets 22 and two front adapter brackets 7, which are arranged laterally along the upper cover 1 to evenly transfer the force of the module bracket 2 and the upper cover 1 to the vehicle body, thereby increasing the structural stability of the battery pack assembly.

[0040] In an optional embodiment, the battery pack assembly further includes a rear adapter bracket 8; the rear adapter bracket 8 is mounted on the rear outer side of the upper cover 1, and the rear adapter bracket 8 is used to be mounted on the vehicle body. Figure 4 The number of rear adapter brackets 8 can be two to evenly transfer the force on the rear of the battery pack assembly to the vehicle body, and together with the front adapter bracket 7, reduce the force and deformation of the battery pack and increase the structural stability of the battery pack.

[0041] The rear adapter bracket 8 can also be fastened to the vehicle body sheet metal by bolts.

[0042] It should be noted that the rear portion in the embodiment of the present application refers to the rear portion along the direction of the vehicle body after the battery pack assembly is installed on the vehicle body. In an optional embodiment, a one-way exhaust valve is installed on each of the first smoke exhaust hole and the second smoke exhaust hole, and the opening pressure of the one-way exhaust valve is adjustable. When the thermal management of the battery pack is out of control, the one-way exhaust valve allows the battery pack to exhaust smoke and gas to the outside in a timely manner to reduce safety hazards. The opening pressure of the one-way exhaust valve is adjustable, which allows vehicles in different usage environments to be adaptively set according to the required smoke and exhaust pressure.

[0043] In an optional embodiment, the battery module 3 further includes a module mounting bolt 30, one end of which is located outside the battery module 3, and the other end of which is passed through the battery module 3 from the bottom and fastened to the floating nut 23 of the module bracket 2. Figure 5 The module mounting bolts 30 are fastened by floating nuts 23. While tightening the module mounting bolts 30, the floating nuts 23 can move within a limited range relative to the mounting holes of the module mounting bolts 30 to address alignment errors during assembly, dimensional changes caused by thermal expansion and contraction, or displacement caused by vibration.

[0044] In one optional embodiment, the bottom guard plate 4 is integrally formed from stamped steel, and the upper cover 1 is stamped from an aluminum alloy. Compared to welded aluminum profile boxes, this method of forming the bottom guard plate 4 and upper cover 1 eliminates the need for welding, thereby addressing weld quality issues and improving production and assembly efficiency. Furthermore, this solution eliminates the need for multiple aluminum profile equipment during production, requiring only a single stamping machine, simplifying the overall process and production flow.

[0045] During assembly, first place the upper cover 1 with the opening facing upwards, and connect the module bracket 2, battery module 3, sealing ring 10, bottom guard plate 4 and other accessories to the upper cover 1 in sequence to form a battery pack. Then, the battery pack is turned upside down by a lift and fixed to the sheet metal of the vehicle chassis with bolts.

[0046] The present application also provides a vehicle, comprising a body sheet metal 9, a body fastening bolt 90 and a battery pack assembly as described in any one of the above embodiments; the body fastening bolt 90 passes through the battery pack assembly from the bottom and is fastened to the body sheet metal 9 by a body fastening nut 91. Figure 8 The battery pack can be stably mounted on the vehicle body through the vehicle body fastening bolts 90.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack assembly, characterized in that: include: The upper cover and the bottom guard plate are buckled together, and the upper cover and the bottom guard plate are sealed at the buckle joint by a sealing ring to define an installation space; A module bracket and a battery module are located in the installation space, wherein the module bracket is installed on the inner top wall of the upper cover, and the battery module is installed on the module bracket; After being installed on the vehicle body, the upper cover, the module bracket, the battery module and the bottom guard plate are arranged in order from high to low along the height direction, and a distance is left between the battery module and the bottom guard plate along the height direction; A first smoke exhaust hole is provided on the bottom of the battery module, and a second smoke exhaust hole is provided on the bottom guard plate.

2. The battery pack assembly according to claim 1, characterized in that: The module bracket includes a supporting longitudinal beam and a supporting transverse beam; The supporting longitudinal beam includes an inner longitudinal beam and two sets of outer longitudinal beams respectively arranged on two sides of the inner longitudinal beam; The supporting cross beam is connected to the ends of the inner longitudinal beam and the two groups of outer longitudinal beams.

3. The battery pack assembly according to claim 2, characterized in that: The battery disconnect unit is installed on the upper cover and has a distance from the bottom guard plate in the height direction.

4. The battery pack assembly according to claim 3, characterized in that: The supporting longitudinal beam further includes two transfer longitudinal beams connected to the supporting cross beam, the transfer longitudinal beams being connected to a side of the supporting cross beam facing away from the inner longitudinal beam, and the ends of the two transfer longitudinal beams both abut against the inner side wall of the upper cover; A space for installing the battery disconnect unit is defined between the supporting crossbeam, the two adapter longitudinal beams and the inner side wall of the upper cover.

5. The battery pack assembly according to claim 2, characterized in that: The battery pack assembly also includes a reinforcement bracket and a front adapter bracket; The reinforcing bracket is located at the inner front portion of the upper cover, and the two side walls of the reinforcing bracket are respectively connected to the inner front portion of the upper cover and the inner longitudinal beam in a one-to-one correspondence; The front adapter bracket is located at the front outer side of the upper cover and is used to be installed on the vehicle body. The front adapter bracket is arranged opposite to the reinforcement bracket and is connected through a fixing piece that passes through the reinforcement bracket, the upper cover and the front adapter bracket.

6. The battery pack assembly according to claim 5, characterized in that: The battery pack assembly also includes a rear adapter bracket; The rear adapter bracket is installed on the rear portion of the outer side of the upper cover, and the rear adapter bracket is used for being installed on a vehicle body.

7. The battery pack assembly according to claim 1, characterized in that: One-way smoke exhaust valves are installed on both the first smoke exhaust hole and the second smoke exhaust hole, and the opening pressure of the one-way smoke exhaust valves is adjustable.

8. The battery pack assembly according to claim 1, characterized in that: The battery module also includes a module mounting bolt, one end of which is limited to the outside of the battery module, and the other end of which is passed through the battery module from the bottom of the battery module and fastened to the floating nut of the module bracket.

9. The battery pack assembly according to claim 1, characterized in that: The bottom guard plate is formed in one piece by stamping steel, and the upper cover is formed by stamping aluminum alloy.

10. A vehicle, characterized in that: Comprising a vehicle body sheet metal, vehicle body fastening bolts and a battery pack assembly according to any one of claims 1 to 9; The vehicle body fastening bolt passes through the battery pack assembly from the bottom of the battery pack assembly and is fastened to the vehicle body sheet metal through a vehicle body fastening nut.

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