Battery case and battery pack

Abstract

Disclosed in the present application are a battery case and a battery pack. The battery case comprises: a case main body; a bottom guard plate, which is arranged in the shape of a flat plate, wherein the bottom guard plate and the case main body are arranged spaced apart from each other and form a suspended portion; and a connecting assembly, which is arranged on the suspended portion, wherein both the case main body and the bottom guard plate are connected to the connecting assembly, so that the bottom guard plate is locked to the case main body.

Description

Battery box and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024214539026, filed on June 24, 2024, to the Chinese Patent Office, the whole content of the above application being incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of battery pack, in particular to a battery box and a battery pack. BACKGROUND

[0003] With the increasing capacity of the battery, its safety protection performance is also paid more and more attention, especially the battery box assembled with multiple batteries. At present, the mainstream battery box mainly relies on the bottom guard plate to prevent impact, bottom scratching and external ball hitting, so that the bottom guard plate is crucial to the safety of the battery box. However, in the related technology, the bottom guard plate needs to be formed into a complex shape by mold machining at the design stage to form effective locking with the battery box, and it is generally made of pure steel plate, which has large overall weight and weak corrosion resistance, resulting in high manufacturing cost and after-sales maintenance cost of the bottom guard plate. TECHNICAL PROBLEM

[0004] The flat composite bottom guard plate cannot have a shape, so that the bottom guard plate and the battery box are directly suspended, resulting in that the bottom guard plate and the battery box cannot form reliable fixation. TECHNICAL SOLUTION

[0005] In a first aspect, the present application provides a battery box, comprising: a box body; a bottom guard plate, the bottom guard plate is arranged in a flat plate shape, and the bottom guard plate is arranged in a spaced manner with the box body and forms a suspended part; a connecting assembly, the connecting assembly is arranged in the suspended part, and the box body and the bottom guard plate are connected with the connecting assembly, so that the bottom guard plate is locked to the box body.

[0006] In a second aspect, the present application further provides a battery pack, comprising the battery box as described above. ADVANTAGEOUS EFFECTS

[0007] By connecting the connecting assembly in the suspended part formed by the bottom guard plate arranged in a flat plate shape and the box body, it can effectively avoid the direct suspension between the bottom guard plate and the box body, so that the bottom guard plate arranged in a flat plate shape can be reliably locked to the box body by the connecting assembly, thereby optimizing the fixation mode of the bottom guard plate and the box body. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 is a structural schematic view of the battery box of the present application embodiment one;

[0009] Fig. 2 is an enlarged schematic view of area A of Fig. 1;

[0010] Fig. 3 is a structural schematic diagram of a liquid cooling plate of the embodiment one of the present application;

[0011] Fig. 4 is a structural schematic diagram of a battery box of the embodiment two of the present application;

[0012] Fig. 5 is an enlarged schematic diagram of the B area of Fig. 4;

[0013] Fig. 6 is a structural schematic diagram of a battery box of the embodiment three of the present application;

[0014] Fig. 7 is an enlarged schematic diagram of the C area of Fig. 6;

[0015] Fig. 8 is another structural schematic diagram of the battery box of the embodiment three of the present application;

[0016] Fig. 9 is a structural schematic diagram of a liquid cooling plate of the embodiment three of the present application;

[0017] Fig. 10 is a structural schematic diagram of a bushing of the embodiment three of the present application;

[0018] Fig. 11 is a structural schematic diagram of a bottom guard plate of the present application.

[0019] Among them, the meaning of the reference signs is as follows:

[0020] 1, box body; 11, liquid cooling plate; 111, second assembly hole; 112, second pull rivet nut; 12, box frame; 2, bottom guard plate; 21, first assembly hole; 22, first fastener; 23, first composite layer; 24, second composite layer; 25, steel plate layer; 3, connecting assembly; 31, first assembly support; 311, first connecting part; 312, first pull rivet nut; 32, bushing; 321, second fastener.

[0021] Embodiment one of the present application:

[0022] Referring to FIG. 1, FIG. 2 and FIG. 3, in the embodiment, a battery box is disclosed, which comprises a box body 1, a bottom guard plate 2 and a connecting assembly 3. In some embodiments, the bottom guard plate 2 is arranged in a flat plate shape, and the bottom guard plate 2 is arranged in a spaced manner with the box body 1 to form a suspended part; the connecting assembly 3 is arranged in the suspended part, and the box body 1 and the bottom guard plate 2 are connected with the connecting assembly 3, so that the bottom guard plate 2 is locked to the box body 1. In some embodiments, the bottom guard plate 2 can be locked to any side of the box body 1 according to actual conditions; preferably, the suspended part formed by the bottom guard plate 2 arranged in a flat plate shape and the box body 1 is connected through the connecting assembly 3, which can effectively avoid the direct suspension between the bottom guard plate 2 and the box body 1, so that the bottom guard plate 2 arranged in a flat plate shape can be reliably locked to the box body 1 through the connecting assembly, thereby optimizing the fixing mode of the bottom guard plate 2 and the box body 1.

[0023] Referring to FIG. 11, in the embodiment, the bottom guard plate 2 comprises a first composite layer 23 and a second composite layer 24, and a steel plate layer 25 is arranged between the first composite layer 23 and the second composite layer 24. In some embodiments, the first composite layer 23 and the second composite layer 24 are made of thermoplastic composite material, and in some embodiments, they are made of PP continuous glass fiber material; in some embodiments, the first composite layer 23 is bonded to one side end face of the steel plate layer 25, and the second composite layer 24 is bonded to the other side end face of the steel plate layer 25; in some embodiments, the steel plate layer 25 is completely wrapped between the first composite layer 23 and the second composite layer 24, so as to improve the corrosion resistance of the bottom guard plate 2, and the bottom guard plate 2 in the embodiment is composed of the first composite layer 23, the steel plate layer 25 and the second composite layer 24, so that the weight of the bottom guard plate 2 in the embodiment is lighter and the production cost is lower than that of the bottom guard plate 2 made of pure steel material with the same thickness and / or strength.

[0024] Referring to FIG. 1 and FIG. 2, in the present embodiment, the box body 1 comprises a liquid cooling plate 11 and a box frame 12, the box frame 12 is fixedly connected to one side of the liquid cooling plate 11 away from the bottom guard plate 2, and the connecting assembly 3 is arranged between the liquid cooling plate 11 and the bottom guard plate 2. In some embodiments, the box frame 12 is formed by one or more longitudinal beams and one or more cross beams; in some embodiments, the box frame 12 and the liquid cooling plate 11 can be fixedly connected by welding, bolt connection, riveting or the like; in some embodiments, the box frame 12 is fixedly connected to one side of the liquid cooling plate 11 and forms at least one cavity; the connecting assembly 3 is arranged on the other side of the liquid cooling plate 11, so that the bottom guard plate 2 is connected with the liquid cooling plate 11 through the connecting assembly 3 and is assembled outside the liquid cooling plate 11, thereby achieving protection of the liquid cooling plate 11 and effectively avoiding damage to the liquid cooling plate 11 or the box body 1 due to knocking the bottom, external ball hitting and the like.

[0025] Referring to FIG. 2 and FIG. 3, in the embodiment, the connecting assembly 3 comprises a plurality of first assembly supports 31 connected to the cabinet body 1, the first assembly supports 31 are provided with first connecting portions 311 protruding towards the bottom guard plate 2, and the first connecting portions 311 are connected with the bottom guard plate 2.Preferably, the first assembly bracket 31 is distributed on one side of the box body 1 close to the bottom guard plate 2. In some embodiments, one end of the first assembly bracket 31 is fixedly connected to the box body 1 by welding, bolting, riveting or the like, and the other end of the first assembly bracket 31 protrudes towards the bottom guard plate 2 to form the first connecting portion 311. The first connecting portion 311 is connected to the bottom guard plate 2 arranged in a flat plate shape, and the bottom guard plate 2 and the box body 1 are prevented from being suspended. The bottom guard plate 2 is fixed to the box body 1 without complex modeling, the fixing mode of the bottom guard plate 2 and the box body 1 is optimized, and the first assembly bracket 31 can be columnar or conical. Preferably, both ends of the first assembly bracket 31 are fixedly connected to the box body 1, and the middle part of the first assembly bracket 31 protrudes towards the bottom guard plate 2 to form the first connecting portion 311. That is, the first assembly bracket 31 is arranged in a U shape as a whole, so that the first assembly bracket 31 has a large contact area with the box body 1, and the first assembly bracket 31 and the box body 1 are firmly connected. The first connecting portion 311 is connected to the bottom guard plate 2 arranged in a flat plate shape, and the bottom guard plate 2 and the box body 1 are prevented from being suspended. The bottom guard plate 2 is fixed to the box body 1 without complex modeling, the fixing mode of the bottom guard plate 2 and the box body 1 is optimized, and the first assembly bracket 31 can be columnar or conical. In some embodiments, the bottom guard plate 2 and the first connecting portion 311 are connected by welding, bolting, riveting or the like. In some embodiments, the first assembly bracket 31 can be distributed on the edge of the box frame 12 and the liquid cooling plate 11, so that the bottom guard plate 2 arranged in a flat plate shape is connected to the box frame 12 and the liquid cooling plate 11 through the connecting assembly 3. The bottom guard plate 2 and the box body 1 are prevented from being suspended, and the bottom guard plate 2 arranged in a flat plate shape is reliably locked to the box body 1. In some embodiments, the first assembly bracket 31 is distributed on one side of the liquid cooling plate 11 close to the bottom guard plate 2. In some embodiments, the box frame 12, the liquid cooling plate 11 and the bottom guard plate 2 are arranged in sequence along the height direction. The bottom guard plate 2 arranged in a flat plate shape is connected to the first connecting portion 311 of the first assembly bracket 31, so that the bottom guard plate 2 arranged in a flat plate shape is connected to the liquid cooling plate 11. The bottom guard plate 2 and the liquid cooling plate 11 are prevented from being suspended, and the bottom guard plate 2 arranged in a flat plate shape is reliably locked to the box body 1.

[0026] Referring to FIG. 2, in the embodiment, the bottom guard plate 2 is provided with a plurality of first assembly holes 21, and first fasteners 22 are assembled in the first assembly holes 21, and the first fasteners 22 are connected with the first connecting portions 311. In some embodiments, the first fasteners 22 can be rivets. When the bottom guard plate 2 is assembled, the bottom guard plate 2 is stacked at the bottom of the cabinet body 1, and the bottom guard plate 2 is abutted with the protruding first connecting portions 311, so that the bottom guard plate 2 arranged in a flat plate form is fixed to the protruding first connecting portions 311, and the bottom guard plate 2 arranged in a flat plate form can be reliably locked on the cabinet body 1, and the fixing mode of the bottom guard plate 2 and the cabinet body 1 is optimized. In some embodiments, the first connecting portions 311 can be provided with threaded holes matched with the first fasteners 22, and the first fasteners 22 are bolts or screws. When the bottom guard plate 2 is assembled, the bottom guard plate 2 is stacked at the bottom of the cabinet body 1, and the bottom guard plate 2 is abutted with the protruding first connecting portions 311, so that the bottom guard plate 2 arranged in a flat plate form is fixed to the protruding first connecting portions 311, and the fixing mode of the bottom guard plate 2 and the cabinet body 1 is optimized.

[0027] Embodiment two:

[0028] Referring to FIG. 4 and FIG. 5, the difference between the present embodiment and embodiment one is that the first pull nut 312 is assembled to the first connecting part 311, and the first fastener 22 passes through the second assembly hole 111 and is connected with the first pull nut 312. Preferably, the two sides of the first assembly bracket 31 are fixedly connected with the cabinet body 1, the middle part of the first assembly bracket 31 protrudes towards the bottom guard plate 2 to form the first connecting part 311, that is, the first assembly bracket 31 is arranged in a U shape as a whole, so as to ensure that the first assembly bracket 31 can have a large enough contact area with the cabinet body 1 to form a firm connection. The first pull nut 312 is arranged on the side of the first connecting part 311 away from the bottom guard plate 2. In some embodiments, the middle part of the first assembly bracket 31 protrudes towards the bottom guard plate 2 to form the first connecting part 311, so that the side of the first connecting part 311 away from the bottom guard plate 2 forms a cavity, and the first pull nut 312 is arranged in the cavity, so as to make full use of the space. Preferably, the first fastener 22 is a bolt. When the bottom guard plate 2 is assembled, the bottom guard plate 2 arranged in a flat plate shape is stacked at the bottom of the cabinet body 1, the bottom guard plate 2 arranged in a flat plate shape is driven to abut against the protruding first connecting part 311, so as to avoid the bottom guard plate 2 arranged in a flat plate shape from being suspended between the cabinet body 1, and the first fastener 22 is driven to pass through the first assembly hole 21 and the second assembly hole 111 in sequence and is threadedly connected with the first pull nut 312, so as to fixedly connect the protruding first connecting part 311 with the bottom guard plate 2 arranged in a flat plate shape, and then realize that the bottom guard plate 2 arranged in a flat plate shape is reliably locked on the cabinet body 1.

[0029] Embodiment three:

[0030] Referring to FIG. 6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10, the difference between the present embodiment and embodiment one or two is that the first assembly support 31 is not fixedly connected to the box body 1. Specifically, the connecting assembly 3 comprises a plurality of bushings 32 connected to the bottom guard plate 2, the second fastener 321 is assembled in the bushing 32, and the second fastener 321 is connected with the liquid cooling plate 11. That is, the effect generated by the second fastener 321 directly acts on the bushing 32, thereby avoiding that the second fastener 321 directly compresses the bottom guard plate 2, and the safety and reliability are higher; in some embodiments, the bushing 32 is a steel bushing 32; in some embodiments, when assembling the bottom guard plate 2, the bottom guard plate 2 arranged in a flat plate is stacked at the bottom of the box body 1, the end of the bushing 32 away from the bottom guard plate 2 is abutted with the liquid cooling plate 11, thereby avoiding that the bottom guard plate 2 and the box body 1 are suspended, and then the second fastener 321 assembled in the bushing 32 is connected with the liquid cooling plate 11, so that the bottom guard plate 2 arranged in a flat plate can be reliably locked on the liquid cooling plate 11, thereby realizing the optimization of the fixing mode of the bottom guard plate 2 and the box body 1. The bushing 32 and the bottom guard plate 2 can be connected by welding, bolt connection, adhesion, clamping and the like.

[0031] Referring to FIG. 7 and FIG. 9, in the present embodiment, the liquid cooling plate 11 is provided with a plurality of second assembly holes 111, a second rivet nut 112 is assembled in the second assembly hole 111, and the second fastener 321 is connected with the second rivet nut 112. In some embodiments, the second fastener 321 is a bolt, and specifically, when the second fastener 321 is tightened, the second rivet nut 112 is deformed synchronously and riveted with the liquid cooling plate 11, and at the same time, the second fastener 321 drives the bottom guard plate 2 arranged in a flat plate to be fixedly connected with the second rivet nut 112, so that the bottom guard plate 2 arranged in a flat plate is connected to the box body 1 through the connection of the second fastener 321 and the second rivet nut 112, and the bottom guard plate 2 arranged in a flat plate is abutted with the liquid cooling plate 11 through the bushing 32, thereby avoiding that the bottom guard plate 2 and the box body 1 are suspended.

[0032] Referring to FIG. 7, FIG. 8 and FIG. 9, in the embodiment, a third assembly hole is formed on the box frame 12, and the rod part of the second rivet nut 112 extends into the third assembly hole. Specifically, when the second fastener 321 is tightened, the second rivet nut 112 is deformed, so that the second rivet nut 112, the liquid cooling plate 11 and the box frame 12 are riveted into a fastened whole, while the second fastener 321 drives the bottom guard plate 2 arranged in a flat plate shape to be fixedly connected with the second rivet nut 112, so that the second fastener 321 and the second rivet nut 112 are connected, the bottom guard plate 2 arranged in a flat plate shape is reliably locked on the box body 1, and the bottom guard plate 2 arranged in a flat plate shape is abutted against the liquid cooling plate 11 through the bushing 32, so that the bottom guard plate 2 and the box body 1 are prevented from being suspended, the bottom guard plate 2 arranged in a flat plate shape can be reliably locked on the box body 1, the fixing mode of the bottom guard plate 2 and the box body 1 is fully optimized, the number of fasteners is effectively reduced, and the production cost is reduced.

[0033] Referring to FIG. 7, FIG. 8, FIG. 9 and FIG. 10, preferably, one end of the bushing 32 penetrates through the bottom guard plate 2 and is fixedly connected with the bottom guard plate 2, and the other end of the bushing 32 extends toward the liquid cooling plate 11. In some embodiments, the rod part of the second rivet nut 112 penetrates through the second assembly hole 111 and the third assembly hole in sequence, and the flange part of the second rivet nut 112 is abutted against the side of the liquid cooling plate 11 close to the bottom guard plate 2. In some embodiments, the second fastener 321 can be a bolt, and the rod part of the second fastener 321 can be connected with the second rivet nut 112 through the bushing 32. When the bottom guard plate 2 is assembled, the bottom guard plate 2 arranged in a flat plate shape is stacked at the bottom of the box body 1, the other end of the bushing 32 is abutted against the liquid cooling plate 11, the bottom guard plate 2 arranged in a flat plate shape and the box body 1 are prevented from being suspended, the second fastener 321 assembled on the bushing 32 is threadedly connected with the second rivet nut 112, the rod part of the second rivet nut 112 is deformed, the second rivet nut 112, the liquid cooling plate 11 and the box frame 12 are riveted into a fastened whole, while the second fastener 321 drives the bottom guard plate 2 arranged in a flat plate shape to be fixedly connected with the second rivet nut 112, so that the second fastener 321 and the second rivet nut 112 are connected, the bottom guard plate 2 arranged in a flat plate shape is reliably locked on the box body 1, and the bottom guard plate 2 arranged in a flat plate shape is abutted against the liquid cooling plate 11 through the bushing 32, so that the bottom guard plate 2 and the box body 1 are prevented from being suspended, the bottom guard plate 2 arranged in a flat plate shape can be reliably locked on the box body 1, the fixing mode of the bottom guard plate 2 and the box body 1 is fully optimized, the number of fasteners is effectively reduced, and the production cost is reduced.

[0034] Embodiment four:

[0035] A battery pack comprising the battery box of any of the above embodiments.

Claims

1. A battery box, comprising: a box body (1); a bottom guard plate (2) arranged in a flat plate shape, and spaced apart from the box body (1) to form an overhang; a connecting assembly (3) arranged in the overhang, the box body (1) and the bottom guard plate (2) being connected with the connecting assembly (3) so that the bottom guard plate (2) is locked to the box body (1).

2. The battery pack of claim 1, wherein: The box body (1) comprises a liquid cooling plate (11) and a box frame (12) fixedly connected to a side of the liquid cooling plate (11) away from the bottom guard plate (2), and the connecting assembly (3) is connected between the liquid cooling plate (11) and the bottom guard plate (2).

3. The battery pack of claim 1 or 2, wherein: The connecting assembly (3) comprises a plurality of first assembly brackets (31) connected to the box body (1), the first assembly bracket (31) being provided with a first connecting portion (311) protruding towards the bottom guard plate (2), and the first connecting portion (311) being connected with the bottom guard plate (2).

4. The battery pack of claim 3, wherein: The bottom guard plate (2) is provided with a plurality of first assembly holes (21), and a first fastener (22) is assembled in the first assembly hole (21), and the first fastener (22) is connected with the first connecting portion (311).

5. The battery box according to claim 4, further comprising a first pull rivet nut (312) assembled in the first connecting portion (311), and the first fastener (22) is connected with the first pull rivet nut (312).

6. The battery pack of claim 2, wherein: The connecting assembly (3) comprises a plurality of bushings (32) connected to the bottom guard plate (2), a second fastener (321) is assembled in the bushing (32), and the second fastener (321) is connected with the liquid cooling plate (11).

7. The battery pack of claim 6, wherein: The liquid cooling plate (11) is provided with a plurality of second assembly holes (111), and a second pull rivet nut (112) is assembled in the second assembly hole (111), and the second fastener (321) is connected with the second pull rivet nut (112).

8. The battery pack of claim 7, wherein: The box frame (12) is provided with a third assembly hole, and a rod portion of the second pull rivet nut (112) extends into the third assembly hole.

9. The battery pack of claim 1, wherein: The bottom guard plate (2) comprises a first composite layer (23) and a second composite layer (24), and a steel plate layer (25) is arranged between the first composite layer (23) and the second composite layer (24).

10. A battery pack comprising the battery box according to any one of claims 1-9.

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