Battery pack bottom protection structure and battery pack thereof

Abstract

The utility model discloses a battery pack bottom protection structure and a battery pack thereof. The bottom protection structure is arranged below a battery pack box body; comprising an upper shell, a buffer structure and a lower shell which are sequentially arranged from top to bottom; an accommodating cavity for filling the buffer structure is formed in the middle of the lower shell; the upper surface and the lower surface of the buffer structure are connected with the inner surfaces of the upper shell and the lower shell in a bonding manner; the edge of the lower shell abuts against the edge of the upper shell, and the lower shell and the upper shell are fixedly arranged at the bottom end of the battery pack box body together through a fastening component. According to the bottom protection structure disclosed by the utility model, when the bottom of the battery pack is impacted by sharp foreign matters, the lower shell firstly deforms, extrudes the middle buffer structure and then transmits to the upper shell above, so that point impact caused by the sharp foreign matters is improved into surface impact on a liquid cooling plate of the battery pack, and safety accidents such as liquid leakage, fire and the like of the battery pack are prevented.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a bottom protective structure for a battery pack and the battery pack thereof. Background Technology

[0002] Existing battery pack bottom protection structures are divided into single-layer steel plates and single-layer aluminum plates. Aluminum bottom plates have poor surface hardness and low strength, making them prone to deformation. Steel bottom plates, on the other hand, offer poor protection with thin plates and are extremely heavy and expensive with thick plates. Furthermore, the existing single-layer bottom plates lack buffering between themselves and the liquid cooling plate at the bottom of the battery pack. This can lead to damage and failure of the liquid cooling plate when the battery pack is impacted by sharp foreign objects during vehicle operation, resulting in safety accidents.

[0003] Therefore, it is urgent to propose a new solution to the above problems. Summary of the Invention

[0004] This utility model provides a bottom protection structure for a battery pack and the battery pack thereof, which can solve the problem in the prior art that when the liquid cooling plate of the battery pack is impacted by a sharp foreign object at the bottom, the single-layer bottom protective plate will be damaged and fail, resulting in a safety accident.

[0005] This utility model provides a bottom protection structure for a battery pack, which is located at the bottom of the battery pack housing; it includes an upper shell, a buffer structure and a lower shell arranged from top to bottom.

[0006] The lower housing has a cavity in the middle for filling the buffer structure;

[0007] The upper and lower surfaces of the buffer structure are respectively bonded to the inner surfaces of the upper and lower shells.

[0008] The left and right sides of the lower and upper housings are fixedly mounted at the bottom of the battery pack housing by fastening components.

[0009] Furthermore, the lower housing is made of 440C stainless steel.

[0010] Furthermore, the lower housing is manufactured using a one-piece molding process, and the thickness of the lower housing is 0.5 to 0.7 mm.

[0011] Furthermore, the buffer structure is made of a non-Newtonian fluid, and a wrapping layer is provided on the outside of the non-Newtonian fluid. Double-sided adhesive is provided on the upper and lower surfaces of the wrapping layer to adhere to the inner surfaces of the upper and lower shells, respectively.

[0012] As another preferred option, the buffer structure is made of silicone foam, modified polyphenylene ether foam, or nylon foam.

[0013] Furthermore, the height of the receiving cavity is 3–10 mm.

[0014] Furthermore, the upper housing is made of aluminum alloy, and the interior of the upper housing away from the fastening member is provided with a serrated structure for weight reduction and structural reinforcement.

[0015] Furthermore, the inner surface of the lower shell is provided with a plurality of reinforcing ribs arranged parallel to the length direction of the lower shell for structural reinforcement.

[0016] Furthermore, the fastening component includes a plurality of rivets disposed on the left and right sides of the bottom protective structure, and the upper housing, lower housing and battery pack housing are provided with openings for the rivets to pass through.

[0017] This utility model also provides a battery pack, including the aforementioned bottom protective structure of the battery pack.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model provides a bottom protection structure consisting of an upper shell and a lower shell, with a buffer structure in the middle. When the bottom of the battery pack is impacted by a sharp foreign object, the lower shell deforms first, squeezing the buffer structure in the middle, and then the impact is transferred to the upper shell. This transforms the point impact from the sharp foreign object into a surface impact on the liquid cooling plate of the battery pack, preventing safety accidents such as leakage and fire in the battery pack.

[0020] 2. The height of the receiving cavity of this utility model is set to 3-10mm. Compared with unreasonable designs that are too large or too small, the 3-10mm design can ensure that the lower shell has a certain deformation space, and can also reduce material consumption.

[0021] 3. The thickness of the lower shell of this utility model is 0.5-0.7mm, which ensures that the bottom protective plate provides sufficient protection for the battery pack while achieving the goal of lightweight design of the bottom protective plate;

[0022] 4. This utility model improves the local rigidity of the bottom protective plate by setting reinforcing ribs on the inner surface of the lower shell, thereby enhancing the overall rigidity of the bottom protective plate. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the battery pack bottom protective structure, the battery pack top cover, and the battery pack housing of this utility model.

[0024] Figure 2 This is a schematic diagram of the bottom protective structure of the battery pack of this utility model;

[0025] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Reference numerals: 1. Battery pack cover; 2. Battery pack housing; 3. Upper shell; 31. Serrated section; 4. Lower shell; 41. Receiving cavity; 42. Transition section; 43. Side; 5. Buffer structure; 6. Fastening component. Detailed Implementation

[0027] To further understand the utility model's content, features, and effects, the following embodiments are provided, along with accompanying drawings. Figures 1-3 The details are as follows.

[0028] like Figures 1-3 As shown, this utility model provides a bottom protection structure for a battery pack, which is located below the battery pack housing 2; it includes an upper shell 3, a buffer structure 5, and a lower shell 4 arranged sequentially from top to bottom;

[0029] The lower housing 4 has a cavity 41 in the middle for filling the buffer structure 5. The upper housing 3 is a square flat plate structure, and the lower housing 4 is a square groove structure with a cavity 41 in the middle. The left and right sides of the cavity 41 are set as inclined transition sections 42, which can improve the overall strength. In addition, the front and rear ends of the cavity 41 are through structures, so the entire lower housing 4 is relatively simple to manufacture.

[0030] The upper and lower surfaces of the buffer structure 5 are respectively bonded to the inner surfaces of the upper shell 3 and the lower shell 4.

[0031] The lower housing 4 and the upper housing 3 are fixedly mounted on the bottom of the battery pack housing 2 by fastening members 6. More specifically, the fastening members 6 are mounted on the side edges 43 on both sides of the lower housing 4, so that the entire bottom protective structure is fixed to the battery pack housing 2 by fastening members 6.

[0032] This utility model features a bottom protective structure consisting of an upper shell and a lower shell, with a buffer structure in the middle. When the bottom of the battery pack is impacted by a sharp foreign object, the lower shell deforms first, squeezing the buffer structure in the middle, and then the impact is transferred to the upper shell. This transforms the point impact from the sharp foreign object into a surface impact on the liquid cooling plate of the battery pack, preventing safety accidents such as leakage and fire.

[0033] In this embodiment, the lower housing 4 is made of 440C stainless steel and is manufactured using an integral molding process, which gives it high hardness. The thickness of the lower housing 4 is 0.5-0.7mm. While ensuring that the bottom protection plate provides sufficient protection for the battery pack, the lightweight design goal of the bottom protection plate is achieved.

[0034] In this embodiment, the material of the buffer structure 5 can be a non-Newtonian fluid, which can be a polymer solution or a polymer melt. The non-Newtonian fluid is surrounded by a coating layer (not shown in the figure), which can be a PE film. Double-sided adhesive is applied to the upper and lower surfaces of the PE film to bond with the inner surfaces of the upper shell 3 and lower shell 4, respectively. The PE film seals both ends of the lower shell 4 to prevent the non-Newtonian fluid from overflowing. The double-sided adhesive restricts the movement of the non-Newtonian fluid. Alternatively, the buffer structure 5 can also be made of silicone foam, modified polyphenylene ether foam, or nylon foam. These materials are inherently adhesive, and additional double-sided adhesive can be added to ensure adhesion. Modified polyphenylene ether foam and nylon foam have a density range of 140 kg / m³ to 350 kg / m³, exhibiting good energy absorption capacity. The energy absorption material accounts for approximately 10% to 25% of the energy absorption, absorbing and dispersing energy when the battery pack is impacted, thus protecting the battery module.

[0035] In this embodiment, as Figure 3 As shown, the height of the receiving cavity 41 is 3-10mm. Compared with unreasonable designs that are too large or too small, the 3-10mm design can ensure that the lower shell has a certain deformation space, and can also reduce material consumption.

[0036] In this embodiment, as Figure 3 As shown, the upper shell 3 is made of aluminum alloy, and its interior, away from the fastening member 6, is provided with a serrated part 31 for weight reduction and structural reinforcement. It can also be configured as a honeycomb aluminum structure.

[0037] In this embodiment, the inner surface of the lower shell 4 is provided with a plurality of reinforcing ribs (not shown in the figure) arranged parallel to the length direction of the lower shell 4 for structural reinforcement, which can increase the rigidity of the lower shell 4.

[0038] In this embodiment, as Figure 3 As shown, the fastening component 6 includes multiple rivets (not shown in the figure) arranged on the left and right sides of the bottom protective structure. The upper housing 3, the lower housing 4 and the battery pack housing 2 have openings for the rivets to pass through.

[0039] like Figure 1 As shown, this utility model also provides a battery pack, including the above-mentioned bottom protective structure of the battery pack, and also includes a battery pack top cover 1.

[0040] The above-described utility model only illustrates the implementation methods of the present utility model and should not be construed as limiting the scope of the utility model patent, nor is it a limitation on the structure of the present utility model embodiments in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present utility model embodiments, and these all fall within the protection scope of the present utility model embodiments.

Claims

1. A bottom protective structure for a battery pack, disposed below the battery pack housing (2); characterized in that: It includes an upper shell (3), a buffer structure (5), and a lower shell (4) arranged from top to bottom; The lower housing (4) is provided with a receiving cavity (41) in the middle for filling the buffer structure (5); The upper and lower surfaces of the buffer structure (5) are respectively bonded to the inner surfaces of the upper shell (3) and the lower shell (4); The lower housing (4) and the upper housing (3) are fixedly mounted on the bottom of the battery pack box (2) by fastening components (6) on the left and right sides.

2. The battery pack bottom protection structure according to claim 1, characterized in that: The lower housing (4) is made of 440C stainless steel.

3. The battery pack bottom protection structure according to claim 1, characterized in that: The lower housing (4) is manufactured using an integral molding process, and the thickness of the lower housing (4) is 0.5 to 0.7 mm.

4. The battery pack bottom protection structure according to claim 1, characterized in that: The buffer structure (5) is made of a non-Newtonian fluid. The non-Newtonian fluid is surrounded by a wrapping layer. The upper and lower surfaces of the wrapping layer are respectively covered with double-sided adhesive that adheres to the inner surfaces of the upper shell (3) and the lower shell (4).

5. The battery pack bottom protection structure according to claim 1, characterized in that: The buffer structure (5) is made of silicone foam, modified polyphenylene ether foam, or nylon foam.

6. The battery pack bottom protection structure according to claim 1, characterized in that: The height of the receiving cavity (41) is 3 to 10 mm.

7. The battery pack bottom protection structure according to claim 1, characterized in that: The upper housing (3) is made of aluminum alloy, and the interior of the upper housing (3) away from the fastening member (6) is provided with a serrated part (31) for weight reduction and structural reinforcement.

8. The battery pack bottom protection structure according to claim 1, characterized in that: The inner surface of the lower shell (4) is provided with a plurality of reinforcing ribs arranged parallel to the length direction of the lower shell (4) for structural reinforcement.

9. The battery pack bottom protection structure according to claim 1, characterized in that: The fastening component (6) includes a plurality of rivets disposed on the left and right sides of the bottom protective structure, and the upper housing (3), lower housing (4) and battery pack housing (2) are provided with openings for the rivets to pass through.

10. A battery pack, characterized in that: Includes the battery pack bottom protection structure as described in any one of claims 1 to 9.

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