CN220510144U

CN220510144U - Battery pack

Info

Publication number: CN220510144U
Application number: CN202322138115.4U
Authority: CN
Inventors: 尚雪莉; 赵幸一
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-08-09
Filing date: 2023-08-09
Publication date: 2024-02-20
Anticipated expiration: 2033-08-09

Abstract

The utility model provides a battery pack, which comprises a battery box and a battery pack arranged in the battery box, wherein the battery pack also comprises a buffer component; the battery box comprises a main body enclosing frame beam, the battery pack is located in an area enclosed by the main body enclosing frame beam, and the buffer assembly is arranged between at least one inner side wall of the main body enclosing frame beam and the battery pack adjacent to the inner side wall; the cushioning assembly includes a reinforcement portion and a cushioning portion, wherein: the buffer part is positioned between the reinforcing part and the inner side wall of the main body surrounding frame beam corresponding to the reinforcing part; the elastic modulus of the reinforcing portion is greater than that of the buffer portion. The buffer component can absorb impact energy of the main body surrounding frame beam, provide extrusion deformation space of the main body surrounding frame beam and limit the deformation range of the main body surrounding frame beam, so that the risk of short circuit or thermal runaway of the battery pack when the main body surrounding frame beam is impacted or extruded and deformed is reduced.

Description

Battery pack

Technical Field

The utility model relates to the technical field of battery packaging, in particular to a battery pack.

Background

In the prior art, the power battery pack is often constructed in a form in which the battery pack 200 is assembled into a battery case. Specifically, the main structure of the battery box is generally a square frame structure as shown in fig. 1, and the square frame structure is formed by connecting four side beams 101 end to end, and then the area surrounded by the four side beams 101 is divided into at least two accommodating cavities by at least one longitudinal beam 102, wherein the accommodating cavities are used for accommodating the battery pack 200.

For the battery pack 200 disposed proximate to the side sill 101, when the side sill 101 is impacted or deformed by extrusion, the side sill 101 has a risk of pressing or even piercing the cell of the battery pack 200 adjacent thereto, that is, the risk of causing a short circuit or thermal runaway of the battery pack after the side sill 101 of the existing battery pack is impacted or deformed by extrusion is high.

Disclosure of Invention

In view of the shortcomings of the prior art, the utility model aims to provide a battery pack which can absorb impact energy of a main body surrounding frame beam, provide a main body surrounding frame beam extrusion deformation space and limit the deformation range of the main body surrounding frame beam, so that the risk of short circuit or thermal runaway of the battery pack when the main body surrounding frame beam is impacted or extruded and deformed is reduced.

The embodiment of the utility model is realized by the following technical scheme:

the battery pack comprises a battery box and a battery pack arranged in the battery box, and the battery pack further comprises a buffer assembly; the battery box comprises a main body enclosing frame beam, the battery pack is located in an area enclosed by the main body enclosing frame beam, and the buffer assembly is arranged between at least one inner side wall of the main body enclosing frame beam and the battery pack adjacent to the inner side wall; the cushioning assembly includes a reinforcement portion and a cushioning portion, wherein: the buffer part is positioned between the reinforcing part and the inner side wall of the main body surrounding frame beam corresponding to the reinforcing part; the elastic modulus of the reinforcing portion is greater than that of the buffer portion.

The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

the buffer part can absorb the impact energy in the inward deformation displacement process of the deformation part of the main body frame surrounding beam in a deformation mode, and simultaneously provides a deformation space for the deformation part of the main body frame surrounding beam; the elastic modulus of the reinforcing part is greater than that of the buffer part, which means that the capability of the reinforcing part in elastic deformation is weaker than that of the buffer part, namely the reinforcing part between the battery pack and the buffer part can effectively resist the displacement of the buffer part towards the battery pack due to deformation, so that the battery cell of the battery pack can be effectively prevented from being extruded or impacted after the main body surrounding frame beam is deformed, and the risk of short circuit or thermal runaway of the battery pack is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic top view of a prior art battery box;

fig. 2 is a schematic top view of a battery box with a buffer assembly according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of an assembled battery box and a buffer assembly according to an embodiment of the present utility model;

FIG. 4 is a schematic top view of a battery box with a buffer assembly according to another embodiment of the present utility model;

fig. 5 is a schematic top view of a battery box assembled with a buffer assembly according to still another embodiment of the present utility model.

Icon: 100. a main body surrounding frame beam; 101. edge beams; 102. a longitudinal beam; 103. a bottom plate; 200. a battery pack; 300. a buffer assembly; 301. a reinforcing part; 302. a buffer section; 400. a gap.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 2 to 3, a battery pack includes a battery case and a battery pack 200 disposed in the battery case, and the battery pack further includes a buffer assembly 300; the battery box comprises a main body enclosing frame beam 100, the battery pack 200 is positioned in an area enclosed by the main body enclosing frame beam 100, and a buffer assembly 300 is arranged between at least one inner side wall of the main body enclosing frame beam 100 and the battery pack 200 adjacent to the inner side wall; cushioning assembly 300 includes a reinforcement portion 301 and a cushioning portion 302, wherein: the buffer portion 302 is located between the reinforcement portion 301 and the inner side wall of the main body frame rail 100 corresponding to the reinforcement portion 301; the elastic modulus of the reinforcing portion 301 is greater than that of the cushioning portion 302.

The buffer assembly 300 herein can play a role in absorbing impact energy of the body surrounding frame beam 100, providing a compression deformation space of the body surrounding frame beam 100, and limiting a deformation range of the body surrounding frame beam 100, thereby reducing a risk of a short circuit or thermal runaway of the battery pack when the body surrounding frame beam 100 is impacted or compression deformed.

Specifically, the reinforcing portion 301 is disposed closer to the cell side of the battery pack 200 than the buffer portion 302. As shown in fig. 3, when the main body surrounding frame beam 100 is extruded or impacted from outside to inside and the main body surrounding frame beam 100 is deformed from outside to inside, the deformation portion of the main body surrounding frame beam 100 is extruded to the buffer portion 302 first, the buffer portion 302 is deformed by compression, and in the process, the buffer portion 302 can absorb the impact energy in the process of inward deformation displacement of the deformation portion of the main body surrounding frame beam 100 in a deformation manner, and meanwhile, a deformation space is provided for the deformation portion of the main body surrounding frame beam 100. Meanwhile, the elastic modulus of the reinforcing portion 301 is greater than that of the buffer portion 302, which means that the capability of the reinforcing portion 301 for elastic deformation is weaker than that of the buffer portion 302, and the rigidity is strong, that is, the reinforcing portion 301 between the battery pack 200 and the buffer portion 302 can effectively resist the displacement of the buffer portion 302 in the direction of the battery pack 200 due to deformation, so that the main body surrounding frame beam 100 can be effectively prevented from being extruded or impacting the battery cell of the battery pack 200 after deformation, and further the risk of short circuit or thermal runaway of the battery pack is reduced.

For convenience of description, a battery pack structure and a mounting layout as shown in fig. 2 will be described as an example.

Specifically, in the main body enclosure frame beam 100 structure shown in fig. 2, the main body enclosure frame beam 100 corresponding to the buffer assembly 300 is defined as a first frame beam, the rest main body enclosure frame beams 100 are second frame beams, and the extending direction of the second frame beams is arranged at an included angle or parallel to the extending direction of the first frame beams; the reinforcement 301 and/or the buffer 302 is connected to the first frame beam or the second frame beam.

Preferably, the main body surrounding frame beam 100 comprises side beams 101, and four side beams 101 are connected end to form the rectangular main body surrounding frame beam 100. In use, the side members 101 on the left and right sides are likely to be deformed by compression, and in this embodiment, deformation of the side members 101 on the right side will be described as an example. The specific structure is shown in fig. 3. The reinforcement 301 is fixedly connected to the battery case. In order to be able to secure the reinforcement 301 against deformation displacement of the side sill 101 on the right side, the reinforcement 301 is optionally fixedly connected to other structures than the side sill 101 on the right side of the battery box. In the present embodiment, the reinforcement 301 is connected to at least one of the two side rails 101 adjacent to the side rail 101 on the right side.

In this embodiment, as shown in fig. 2 to 5, for the buffer assembly 300 at the right side rail 101, the side rail 101 at the right side is a first frame rail, and three side rails 101 adjacent to and opposite to the right side rail 101 are second frame rails; the two ends of the reinforcement 301 of the buffer assembly 300 are correspondingly connected to two second frame beams adjacent to the first frame beams. The two ends of the buffer portion 302 of the buffer assembly 300 are correspondingly connected to two second frame beams adjacent to the first frame beam, or the buffer portion 302 of the buffer assembly 300 is mounted to the first frame beam. Of course, in other embodiments, as shown in fig. 4, when the side beam 101 on the right side is in a shape of a right protruding arc, the reinforcement portion 301 may be fixedly connected to the side beam 101, that is, the reinforcement portion 301 of the buffer assembly 300 may be fixedly connected to the first frame beam, and accordingly, the buffer portion 302 of the buffer assembly 300 is also fixed to the first frame beam.

Accordingly, for the shock assembly 300 at the left side rail 101, the side rail 101 at the left side is a first frame rail, and the three side rails 101 adjacent and opposite to the left side rail 101 are second frame rails.

In this embodiment, the arrangement direction of the buffer modules 300 and the inner side walls of the main body enclosure beams 100 corresponding thereto is defined as the thickness direction. In other words, the shortest distance between the buffer assembly 300 and the inner sidewall of the main body frame rail 100 corresponding to the buffer assembly 300 is oriented in the thickness direction; the maximum thickness of the corresponding buffer portion 302 of the buffer assembly 300 in the corresponding thickness direction is a; the maximum thickness of the corresponding reinforcement 301 of the buffer assembly 300 in the corresponding thickness direction is b; then: a/b is more than or equal to 3 and less than or equal to 20. Also, the side sill 101 on the right side is described as an example, and the thickness direction thereof is parallel to the left and right directions as shown in fig. 2 and to the inside and outside directions as shown in fig. 3. Specifically, as shown in fig. 3, when the ratio of the thickness dimension of the buffer part 302 to the thickness dimension of the reinforcement part 301 is within the above-mentioned numerical range, the buffer block can provide a deformation space for the side sill 101 on the right side, while ensuring the strength of the reinforcement part 301, and simultaneously, can effectively prevent the buffer assembly 300 from excessively occupying the space in the battery case, and ensure the energy density of the battery pack.

Further, if the shortest distance between the inner sidewall of the main body surrounding frame beam 100 corresponding to the buffer assembly 300 and the battery pack 200 in the thickness direction is c, then: (a+b)/c is more than or equal to 0.2 and less than or equal to 0.8. By the arrangement, on one hand, the safe creepage distance between the reinforcing part 301 and the adjacent battery pack 200 can be ensured, the short circuit inside the battery pack is prevented, and on the other hand, the resistance of the buffer assembly 300 to the deformation of the corresponding side beam 101 can be ensured.

Further, the value of b is in the range of 3mm-20mm.

In the present embodiment, a gap 400 is provided between the reinforcement 301 and the battery pack 200 adjacent thereto. The gap 400 can provide a creepage distance between the reinforcement 301 and the battery pack 200 adjacent thereto, preventing both from short circuits affecting the safety of the battery pack.

In this embodiment, the reinforcement portion 301 is made of a metal material. Optionally, the material of the stiffener 301 includes, but is not limited to, iron, copper, aluminum, steel, alloys, and the like. Preferably, the reinforcement 301 is made of steel.

Further, the tensile strength and the yield strength of the reinforcing portion 301 are both greater than those of the main body girt beam 100.

In this embodiment, the battery pack may be a cylindrical power battery pack or a square battery pack. In the present embodiment, the reinforcement portion 301 has a shape-following structure in order to ensure an increase in the energy density of the battery pack while ensuring the clearance 400 between the reinforcement portion 301 and the adjacent battery pack 200. Specifically, the side of the reinforcing portion 301 facing the battery pack 200 adjacent thereto is profiled as much as possible according to the profile of the side of the battery pack 200 facing the reinforcing portion 301 so as to be disposed as closely as possible to the adjacent battery pack 200 while ensuring the clearance 400.

In this embodiment, the side beam 101 is a casting or a profile.

As shown in fig. 2, in the present embodiment, it is required that the lengths of two side beams 101 located at opposite sides of the four side beams 101 are equal, that is, the lengths of two adjacent side beams 101 may be equal or unequal, which is not particularly limited.

Of course, in other embodiments, the number of edge beams 101 may be three, five or six, depending on the shape and design requirements of a particular battery box, without specific limitation.

As shown in fig. 2 and 5, in some embodiments, the main body frame surrounding beam 100 further includes longitudinal beams 102, and at least one longitudinal beam 102 is configured to divide an area surrounded by the four side beams 101 into at least two accommodating chambers, and the battery pack 200 is disposed in the accommodating chambers.

Also illustrated is a cushioning assembly 300 at the right side rail 101. For the cushion assembly 300 at the right side rail 101, the right side rail 101 is a first frame rail, and the side rails 101 and the side members 102 other than the right side rail 101 are second frame rails. In this embodiment, the reinforcing portion 301 and/or the cushioning portion 302 may be connected to two side rails 101 adjacent to the right side rail 101 as shown in fig. 2, or the reinforcing portion 301 and/or the cushioning portion 302 may be connected to the side rail 102 adjacent to the right side rail 101 as shown in fig. 5. When the reinforcing portion 301 and/or the cushioning portion 302 are connected to the side member 102 adjacent to the right side rail 101, the reinforcing portion 301 and the cushioning portion 302 are each in a "" shaped structure, and the reinforcing portion 301 and the cushioning portion 302 semi-surround the battery pack 200. Specifically, the free ends of the reinforcement 301 and the buffer 302 are welded or bolted to the adjacent stringers 102.

While for the cushioning assembly 300 at the side member 102 (illustrated as the side member 102 adjacent to the right side member 101), the side member 102 is a first frame member, and the side members 101 and 102 other than the side member 102 are second frame members.

In this embodiment, the reinforcing portion 301 is welded or bolted to the main body frame rail 100.

In this embodiment, as shown in fig. 3, the battery box further includes a bottom plate 103 disposed at the bottom of the main body enclosure beam 100; the reinforcement 301 and/or the cushioning 302 is connected to the base plate 103. In the present embodiment, both the reinforcing portion 301 and the buffer portion 302 are connected to the bottom plate 103.

In some embodiments, alternatively, both the reinforcing portion 301 and the buffer portion 302 may be connected to the main body enclosure frame beam 100 and the bottom plate 103 at the same time, thereby increasing the assembly strength thereof with the battery box to better resist the deformation of the corresponding first frame beam.

In some embodiments, the buffer portion 302 is connected to an inner sidewall (inner sidewall of the first frame beam) of the main body enclosure frame beam 100 corresponding thereto. That is, the buffer portion 302 of the buffer assembly 300 may be connected to the side beam 101, i.e., the first frame beam, corresponding thereto, while being connected to the second frame beam and the bottom plate 103.

In this embodiment, the cushioning portion 302 preferably includes, but is not limited to, foam or the like.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A battery pack comprising a battery box and a battery pack (200) arranged in the battery box, characterized in that the battery pack further comprises a buffer assembly (300);

the battery box comprises a main body enclosing frame beam (100), the battery pack (200) is located in an area enclosed by the main body enclosing frame beam (100), and the buffer assembly (300) is arranged between at least one inner side wall of the main body enclosing frame beam (100) and the battery pack (200) adjacent to the inner side wall;

the cushioning assembly (300) comprises a reinforcement portion (301) and a cushioning portion (302), wherein:

the buffer part (302) is positioned between the reinforcing part (301) and the inner side wall of the main body surrounding frame beam (100) corresponding to the reinforcing part (301);

the elastic modulus of the reinforcing part (301) is greater than that of the buffer part (302).

2. The battery pack according to claim 1, wherein an arrangement direction of the buffer assembly (300) and the inner side walls of the main body surrounding frame beams (100) corresponding thereto is defined as a thickness direction;

-the maximum thickness of the cushioning portion (302) corresponding to the cushioning assembly (300) in the corresponding thickness direction is a;

the maximum thickness of the reinforcement part (301) corresponding to the buffer assembly (300) in the corresponding thickness direction is b; then:

3≤a/b≤20。

3. the battery pack according to claim 2, wherein a shortest distance in the thickness direction between the inner side wall of the main body enclosure frame beam (100) corresponding to the buffer assembly (300) and the battery pack (200) is c:

0.2≤(a+b)/c≤0.8。

4. a battery pack according to claim 2 or 3, wherein b has a value in the range of 3mm to 20mm.

5. A battery pack according to any one of claims 1-3, wherein the reinforcement (301) is made of a metallic material.

6. A battery pack according to any one of claims 1-3, wherein the tensile strength and yield strength of the reinforcement (301) are both greater than the tensile strength and yield strength of the body frame rail (100).

7. A battery pack according to any one of claims 1-3, wherein the main body frame rail (100) is formed by connecting at least three side rails (101) end to end, and the buffer assembly (300) is disposed between at least one side rail (101) and the battery pack (200) adjacent to the side rail (101);

the side beam (101) is a casting or a section bar.

8. A battery pack according to any one of claims 1-3, wherein a gap (400) is provided between the reinforcement portion (301) and the battery pack (200) adjacent thereto.

9. A battery pack according to any one of claims 1-3, wherein the battery box further comprises a bottom plate (103) provided at the bottom of the main body enclosure frame beam (100);

the reinforcement (301) and/or the buffer (302) is connected to the base plate (103).

10. A battery pack according to any one of claims 1-3, wherein the main body enclosure frame beams (100) corresponding to the buffer assemblies (300) are defined as first frame beams, the rest of the main body enclosure frame beams (100) are defined as second frame beams, and the extending direction of the second frame beams is arranged at an included angle or parallel to the extending direction of the first frame beams;

the reinforcement (301) and/or the buffer (302) is connected to the first frame beam or the second frame beam.

11. A battery pack according to any one of claims 1-3, wherein the buffer portion (302) is connected to an inner side wall of the main body frame rail (100) corresponding thereto.

12. A battery pack according to any one of claims 1-3, wherein the reinforcement (301) is a profile.

13. A battery pack according to any one of claims 1-3, wherein the reinforcement (301) is a conformal structure.