Battery pack box body

Abstract

The battery pack box comprises a bottom plate and a frame assembly, the frame assembly comprises four frames arranged on the bottom face of the bottom plate, the cross section of each frame is shaped like a Chinese character'ri ', each frame comprises a transverse plate arranged on the bottom plate, the two ends of each transverse plate are provided with a first L-shaped plate and a second L-shaped plate respectively, and openings of the first L-shaped plates and the second L-shaped plates are oppositely arranged; a first reinforcing plate is arranged at the tail end of the horizontal section of the first L-shaped plate and is in an L shape, the horizontal section of the first reinforcing plate is welded to the transverse plate, a second reinforcing plate is arranged at the tail end of the horizontal section of the second L-shaped plate, and the second reinforcing plate is vertically arranged and welded to the vertical section of the first reinforcing plate. The battery pack box has the effect of improving the overall structural strength of the battery pack box.

Description

Technical Field

[0001] This application relates to the technical field of battery packs, and particularly to a battery pack box body. Background Art

[0002] The battery pack box body is an important part of the new energy vehicle battery system, mainly used to accommodate and protect battery modules. The battery pack box body usually includes a frame, a bottom plate and a box cover. After the battery module is placed on the bottom plate, the box cover and the bottom plate are fixedly connected, so as to form a closed space inside the battery pack box body to prevent the operation of the battery module from being affected by external factors.

[0003] However, the battery module usually has a large weight. After the battery module is placed on the bottom plate, the frame will bear the support load from the battery module. At the same time, when the vehicle is moving, there will be bumps or collisions, etc. At this time, the frame will suddenly receive dynamic loads from different directions. However, the existing frame cross-sections are usually too thin or have simple shapes, such as rectangles and trapezoids. The frames with such cross-sections have insufficient bending and torsion resistance. When the frame is subjected to sudden dynamic loads, the frame is prone to deformation or damage, etc., resulting in a reduction in the overall structural strength of the battery pack box body, which has obvious deficiencies. Utility Model Content

[0004] In order to improve the overall structural strength of the battery pack box body, this application provides a battery pack box body.

[0005] The battery pack box body provided by this application adopts the following technical solutions:

[0006] A battery pack box body includes a bottom plate and a frame assembly. The bottom plate is used to support the battery module. The frame assembly includes four frames arranged on the bottom surface of the bottom plate. The cross-section of the frame is in the shape of a "day". The frame includes a cross plate arranged on the bottom plate. First L-shaped plates and second L-shaped plates are respectively arranged at both ends of the cross plate. The openings of the first L-shaped plate and the second L-shaped plate are arranged opposite to each other. A first reinforcing plate is arranged at the end of the horizontal section of the first L-shaped plate. The first reinforcing plate is in the shape of an L. The horizontal section of the first reinforcing plate is welded to the cross plate. A second reinforcing plate is arranged at the end of the horizontal section of the second L-shaped plate. The second reinforcing plate is vertically arranged and welded to the vertical section of the first reinforcing plate.

[0007] By adopting the above technical solutions, the first L-shaped plate and the second L-shaped plate provide stable support for both ends of the frame. At the same time, the arrangement of the first reinforcing plate and the second reinforcing plate improves the structural strength of the first L-shaped plate and the second L-shaped plate on the cross plate. In this way, a frame with a "day"-shaped cross-section is formed, and the moment of inertia of the frame cross-section increases, thereby improving the bending and torsion resistance of the frame, reducing the possibility of deformation or damage when the frame is subjected to sudden external force loads, and thus improving the overall structural strength of the battery pack box body.

[0008] Optionally, a liquid cooling plate is provided on the bottom surface of the bottom plate. The liquid cooling plate is provided with a plurality of cooling channels communicating with each other along the length direction. An inlet joint and an outlet joint communicating with the cooling channels are provided on the surface of the bottom plate.

[0009] By adopting the above technical solution, when the battery module works in the battery box, a large amount of heat will be dissipated. The accumulation of heat will cause the bottom plate and the frame to expand due to heat. By setting the liquid cooling plate, the coolant absorbs the heat generated by the battery module during the flow in the cooling channels, thereby realizing the absorption of the heat dissipated by the battery pack, reducing the adverse impact of the heat accumulation in the battery box on the structural strength of the frame and the bottom plate, and further improving the overall structural strength of the battery box body.

[0010] Optionally, a plurality of cross beams are provided on the surface of the liquid cooling plate facing away from the bottom plate. The length directions of the plurality of cross beams are perpendicular to the length direction of the cooling channels. A plurality of connecting components are provided on opposite sides of each cross beam. The cross beam is detachably connected to the liquid cooling plate through the connecting components.

[0011] By adopting the above technical solution, the uniformly distributed plurality of cross beams can effectively disperse the load borne by the bottom plate and the liquid cooling plate. And when the vehicle jolts or collides, the cross beams can effectively disperse and bear the impact force, reducing the damage or deformation of the battery box body caused by local stress concentration, thereby further improving the overall structural strength of the battery box body.

[0012] Optionally, the connecting component includes a plurality of bosses provided on the surface of the liquid cooling plate. Grooves corresponding to the bosses one by one are provided on the cross beam. The bosses extend into the grooves. Connecting holes communicating with each other are provided on the cross beam and the bosses. A blind rivet is provided in the connecting hole.

[0013] By adopting the above technical solution, when installing the cross beam, the worker uses the bosses to locate the installation position of the cross beam, then presses the cross beam so that the groove covers the boss, and finally fixes and connects the liquid cooling plate and the cross beam through the blind rivet, improving the connection strength of the cross beam on the bottom surface of the liquid cooling plate. Such a setting realizes the detachable connection between the cross beam and the liquid cooling plate, facilitating the worker to timely replace the damaged cross beam and ensuring the support strength of the cross beam.

[0014] Optionally, a plurality of pits are provided on the surface of the cross beam. The length direction of the pits is parallel to the length direction of the cross beam. The edges of the pits are transitioned in an arc shape.

[0015] By adopting the above technical solution, the opening of the pits increases the complexity of the cross-sectional shape of the crossbeam, increases the moment of inertia of the cross-section, thereby improving the crossbeam's ability to resist bending deformation. The arc-shaped edges effectively disperse the concentrated stress at the edges of the pits, further improving the structural strength of the crossbeam. At the same time, the pits reduce the weight of the crossbeam to a certain extent, meeting the requirements of automotive lightweight design.

[0016] Optionally, a gasket is provided on the surface of the bottom plate facing away from the liquid cooling plate.

[0017] By adopting the above technical solution, the setting of the gasket enhances the sealing performance between the bottom plate and the box cover, reducing the possibility that water enters the battery box body and affects the operation of the battery module when the vehicle wades through water.

[0018] Optionally, the gasket, the bottom plate, and the liquid cooling plate are fixedly connected to the frame assembly through a plurality of blind rivet nuts.

[0019] By adopting the above technical solution, the gasket, the bottom plate, and the liquid cooling plate are connected to the frame assembly through blind rivet nuts, further improving the stability of the connection structure of the battery box body. At the same time, the blind rivet nuts are easy to assemble, simplifying the assembly process of the battery box body and improving the production efficiency of the battery box body.

[0020] Optionally, both the frame and the crossbeam are made of steel.

[0021] By adopting the above technical solution, steel has high strength and stiffness, and can withstand the mechanical stress suffered by the battery box body during vehicle operation, thereby reducing the possibility of deformation of the frame and the crossbeam, and further improving the structural strength of the battery box body.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. In the present application, by providing a frame with a "day"-shaped cross-section, the frame with a "day"-shaped cross-section increases the moment of inertia of the cross-section, thereby improving the bending and torsional resistance of the frame, reducing the possibility of deformation or damage when the frame is subjected to sudden external loads, and thus improving the overall structural strength of the battery pack box body;

[0024] 2. In the present application, by providing crossbeams, a plurality of uniformly distributed crossbeams can effectively disperse the loads borne by the bottom plate and the liquid cooling plate. And when the vehicle jolts or collides, the crossbeams can effectively disperse and bear the impact force, reducing the damage or deformation of the battery pack box body caused by local stress concentration, thereby further improving the overall structural strength of the battery pack box body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a schematic diagram of the structure of this application.

[0026] Figure 2 It is a side view used to show the cross-section of the frame in the embodiment of the present application.

[0027] Figure 3 It is an exploded diagram of the sealing gasket, base plate, liquid cooling plate, crossbeam and frame assembly in the embodiment of the present application.

[0028] Figure 4 It is a schematic diagram of the structure of the crossbeam in the embodiment of the present application.

[0029] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0030] Explanation of the reference numerals: 1. bottom plate; 2. frame assembly; 21. frame; 211. cross plate; 212. first L plate; 213. second L plate; 214. first reinforcing plate; 215. second reinforcing plate; 3. liquid cooling plate; 31. cooling channel; 32. liquid inlet connector; 33. liquid outlet connector; 4. cross beam; 5. connecting assembly; 51. boss; 41. groove; 42. connecting hole; 52. blind rivet; 43. pit; 6. sealing gasket; 7. rivet nut. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1-5 This application is described in further detail.

[0032] An embodiment of the present application discloses a battery pack case.

[0033] Reference Figure 1 A battery pack box includes a bottom plate 1, the bottom plate 1 is used to support a battery module, the side of the bottom plate 1 close to the battery module is an inner side, and the side away from the battery module is an outer side.

[0034] Reference Figure 1 and Figure 2 A frame assembly 2 is provided on the outer side of the base plate 1. The frame assembly 2 includes four frames 21 arranged on the outer side of the base plate 1. The four frames 21 are spliced ​​end to end with each other in a mouth shape and distributed on the outer peripheral side of the outer side of the base plate 1. The cross section of each frame 21 is in the shape of a Japanese character, and the frame 21 is made of steel material with high strength and rigidity.

[0035] Reference Figure 1 and Figure 2, the frame 21 includes a horizontal plate 211 disposed on the outer side surface of the bottom plate 1. At both ends of the horizontal plate 211 perpendicular to the length direction of the horizontal plate 211, a first L-shaped plate 212 and a second L-shaped plate 213 are respectively fixedly connected. The openings of the first L-shaped plate 212 and the second L-shaped plate 213 are oppositely arranged. The end of the horizontal section of the first L-shaped plate 212 is fixedly connected with a first reinforcing plate 214. The first reinforcing plate 214 is L-shaped. The vertical section of the first reinforcing plate 214 is perpendicular to the horizontal plate 211, and the horizontal section of the first reinforcing plate 214 is welded to the bottom surface of the horizontal plate 211. The end of the horizontal section of the second L-shaped plate 213 is fixedly connected with a second reinforcing plate 215. The second reinforcing plate 215 is perpendicular to the horizontal plate 211 and there is a gap between the end face and the surface of the horizontal plate 211. The second reinforcing plate 215 is welded to the vertical section of the first reinforcing plate 214. The horizontal plate 211, the first L-shaped plate 212, the second L-shaped plate 213, the first reinforcing plate 214 and the second reinforcing plate 215 are integrally formed.

[0036] The first L-shaped plate 212 and the second L-shaped plate 213 provide stable support for both ends of the frame 21. At the same time, the settings of the first reinforcing plate 214 and the second reinforcing plate 215 improve the structural strength of the first L-shaped plate 212 and the second L-shaped plate 213 on the horizontal plate 211. The frame 21 with a "day" - shaped cross - section is formed in this way. The moment of inertia of the cross - section of the frame 21 increases, thereby improving the bending and torsional resistance of the frame 21, reducing the possibility of deformation or damage of the frame 21 when it is subjected to sudden external force loads, and thus improving the overall structural strength of the battery pack box body.

[0037] Refer to Figure 1 and Figure 2 , in this embodiment, the frame 21 is made of a steel plate through multiple folding processes. During production, one end of the steel plate is first folded upward to form the first reinforcing plate 214, and then the steel plate is continuously folded to form the first L-shaped plate 212. When both the vertical section of the first L-shaped plate 212 and the first reinforcing plate 214 are perpendicular to the steel plate and the horizontal section of the first reinforcing plate 214 abuts against the surface of the non - folded area of the steel plate, the worker welds the horizontal section of the first reinforcing plate 214 to the surface of the steel plate. Then, the other end of the steel plate away from the first L-shaped plate 212 is folded upward to form the second reinforcing plate 215, and then the steel plate is continuously folded to form the second L-shaped plate 213. When both the vertical section of the second L-shaped plate 213 and the second reinforcing plate 215 are perpendicular to the steel plate and the end face of the second reinforcing plate 215 abuts against the end face of the vertical section of the first reinforcing plate 214, the second reinforcing plate 215 is welded to the vertical section of the first reinforcing plate 214, thereby forming the frame 21 with a day - shaped cross - section.

[0038] The process of making the frame 21 from a single steel plate does not require splicing and welding of multiple steel plates, reducing the number of welds in the frame 21 and reducing the possibility of the frame 21 being structurally weak due to excessive welds, thereby further improving the structural strength of the frame assembly 2.

[0039] Refer toFigure 3 and Figure 4 When the battery module works inside the battery box, it will emit a large amount of heat. The accumulation of heat will not only affect the normal operation of the battery module, but also the heat will be transferred to the bottom plate 1 and the frame 21, causing the bottom plate 1 and the frame 21 to expand due to heat, thus resulting in a decrease in the structural strength of the bottom plate 1 and the frame 21.

[0040] To solve the above technical problems, a liquid cooling plate 3 is provided on the outer side of the bottom plate 1. The liquid cooling plate 3 is provided with a plurality of cooling channels 31 communicating with each other along the length direction. In this embodiment, the number of the cooling channels 31 is four, and the four cooling channels 31 are evenly distributed on the liquid cooling plate 3 at equal intervals. An inlet joint 32 and an outlet joint 33 are connected and arranged on the inner side of the bottom plate 1, and the inlet joint 32 and the outlet joint 33 are externally connected to the coolant source.

[0041] Refer to Figure 3 and Figure 4 The coolant flows into the cooling channel 31 through the inlet joint 32, and then flows out from the outlet joint 33 through the cooling channel 31. During the process of flowing in the cooling channel 31, the coolant absorbs the heat generated by the battery module, thus realizing the absorption of the heat dissipated by the battery pack, reducing the adverse effect of the heat accumulation in the battery box on the structural strength of the frame 21 and the bottom plate 1, and further improving the overall structural strength of the battery box body.

[0042] Refer to Figure 4 and Figure 5 A plurality of cross beams 4 are arranged on the surface of the liquid cooling plate 3 facing away from the bottom plate 1. In this embodiment, the number of the cross beams 4 is three, and the three cross beams 4 are evenly distributed on the bottom surface of the liquid cooling plate 3 at equal intervals. The length direction of the cross beam 4 is perpendicular to the length direction of the cooling channel 31. A plurality of connecting components 5 are arranged on both opposite sides of each cross beam 4. The cross beam 4 is detachably connected to the liquid cooling plate 3 through the connecting component 5. The cross beam 4 is made of a steel material with high strength and stiffness.

[0043] Refer to Figure 4 and Figure 5 The connecting component 5 includes a boss 51 arranged on the liquid cooling plate 3. A groove 41 corresponding to the boss 51 one by one is formed on the cross beam 4. The top end of the boss 51 extends into the inside of the groove 41 and abuts against the bottom wall of the groove 41. Connecting holes 42 communicating with each other are formed on the cross beam 4 and the boss 51, and a blind rivet 52 is fixedly connected in the connecting hole 42.

[0044] The worker uses the boss 51 to locate the installation position of the cross beam 4. Subsequently, the cross beam 4 is pressed so that the groove 41 covers the boss 51. Finally, the liquid cooling plate 3 and the cross beam 4 are fixedly connected by blind rivets 52, realizing the installation of the cross beam 4 on the liquid cooling plate 3. Multiple evenly distributed cross beams 4 can effectively disperse the loads borne by the bottom plate 1 and the liquid cooling plate 3. And when the vehicle jolts or collides, the cross beam 4 can effectively disperse and bear the impact force, reducing the damage or deformation of the battery pack box caused by local stress concentration, thereby further improving the overall structural strength of the battery pack box.

[0045] Referring to Figure 4 and Figure 5 , on the surface of the cross beam 4 facing away from the liquid cooling plate 3, a plurality of pits 43 are provided. The length direction of the pits 43 is parallel to the direction of the cross beam 4, and the edges of the pits 43 are transitioned in an arc shape. The provision of the pits 43 increases the complexity of the cross-sectional shape of the cross beam 4, increases the moment of inertia of the cross-section, thereby improving the ability of the cross beam 4 to resist bending deformation. The arc-shaped edges effectively disperse the concentrated stress received at the edges of the pits 43, further improving the structural strength of the cross beam 4. At the same time, the pits 43 reduce the weight of the cross beam 4 to a certain extent, meeting the requirements of automotive lightweight design.

[0046] Referring to Figure 3 and Figure 4 , a sealing gasket 6 is provided on the inner side surface of the back of the bottom plate 1 to improve the overall sealing performance of the battery pack box. The sealing gasket 6, the bottom plate 1 and the liquid cooling plate 3 are fixedly connected to the frame 21 by a plurality of blind rivet nuts 7. By using the blind rivet nuts 7 to connect the sealing gasket 6, the bottom plate 1 and the liquid cooling plate 3 to the frame assembly 2, the connection structural stability of the battery box is further improved. At the same time, the blind rivet nuts 7 are convenient for assembly, simplifying the assembly process of the battery box and improving the production efficiency of the battery box.

[0047] The implementation principle of the battery pack box disclosed in the embodiment of the present application is as follows: The frame 21 with a "day" - shaped cross - section is formed by folding a steel plate multiple times. The frame 21 with a "day" - shaped cross - section increases the moment of inertia of the cross - section, thereby improving the bending and torsion resistance capabilities of the frame 21, reducing the possibility of deformation or damage of the frame 21 when subjected to sudden external force loads, and thus improving the overall structural strength of the battery pack box.

[0048] The above are all the preferred embodiments of the present application. The protection scope of the present application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A battery pack housing, characterized in that, It includes a bottom plate (1) and a frame assembly (2). The bottom plate (1) is used to support the battery module. The frame assembly (2) includes four frames (21) arranged on the bottom surface of the bottom plate (1). The cross-section of the frame (21) is in the shape of a Chinese character 'Ri'. The frame (21) includes a cross plate (211) arranged on the bottom plate (1). At both ends of the cross plate (211), a first L-shaped plate (212) and a second L-shaped plate (213) are respectively arranged. The openings of the first L-shaped plate (212) and the second L-shaped plate (213) are arranged oppositely. At the end of the horizontal section of the first L-shaped plate (212), a first reinforcing plate (214) is arranged. The first reinforcing plate (214) is in an L shape. The horizontal section of the first reinforcing plate (214) is welded to the cross plate (211). At the end of the horizontal section of the second L-shaped plate (213), a second reinforcing plate (215) is arranged. The second reinforcing plate (215) is vertically arranged and welded to the vertical section of the first reinforcing plate (214).

2. The battery pack box according to claim 1, characterized in that A liquid cooling plate (3) is arranged on the bottom surface of the bottom plate (1). The liquid cooling plate (3) is provided with a plurality of cooling channels (31) communicating with each other along the length direction. An inlet joint (32) and an outlet joint (33) communicating with the cooling channels (31) are arranged on the surface of the bottom plate (1).

3. The battery pack box according to claim 2, characterized in that, A plurality of cross beams (4) are arranged on the surface of the liquid cooling plate (3) facing away from the bottom plate (1). The length directions of the plurality of cross beams (4) are perpendicular to the length direction of the cooling channels (31). A plurality of connecting components (5) are arranged on opposite sides of each cross beam (4). The cross beam (4) is detachably connected to the liquid cooling plate (3) through the connecting components (5).

4. A battery pack housing according to claim 3, wherein, The connecting component (5) includes a plurality of bosses (51) arranged on the surface of the liquid cooling plate (3). Grooves (41) corresponding to the bosses (51) one by one are arranged on the cross beam (4). The bosses (51) extend into the inside of the grooves (41). Connecting holes (42) communicating with each other are arranged on the cross beam (4) and the bosses (51). A blind rivet (52) is arranged in the connecting hole (42).

5. A battery pack housing according to claim 3, characterized in that, A plurality of pits (43) are arranged on the surface of the cross beam (4). The length direction of the pits (43) is parallel to the length direction of the cross beam (4). The edges of the pits (43) are in arc-shaped transition.

6. The battery pack box according to claim 2, characterized in that, A sealing gasket (6) is arranged on the surface of the bottom plate (1) facing away from the liquid cooling plate (3).

7. A battery pack housing according to claim 6, wherein, The sealing gasket (6), the bottom plate (1), and the liquid cooling plate (3) are fixedly connected to the frame assembly (2) through a plurality of blind rivet nuts (7).

8. The battery pack housing according to claim 3, wherein, Both the frame (21) and the cross beam (4) are made of steel.

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