Local stress dispersion structure of battery box body

Abstract

The local stress dispersion structure of the battery box body comprises the battery box body and the hanging lug arranged on the battery box body, the stress dispersion assembly is arranged between the battery box body and the hanging lug, and the stress dispersion assembly can effectively solve the problem of stress concentration generated by welding of the hanging lug and the battery box body. The welding fusion penetration risk is reduced, the vibration resistance of the box body is improved, and the influence of welding spot failure of the battery box body on the air tightness and safety of the battery pack in later use is reduced; the local stress dispersion structure of the battery box body provided by the utility model can effectively solve the problem of stress concentration generated by the welding of the hanging lugs and the battery box body, is beneficial to reducing the welding penetration risk, and improves the vibration resistance of the box body; and the influence of the welding spot failure of the battery box body on the air tightness and safety of the battery pack in later use is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of battery box, specifically, it relates to a local stress dispersion structure for a battery box. Background Technology

[0002] With the popularization of new energy vehicles, the safety requirements for power batteries are gradually increasing. The mounting ears are key components at the connection between the battery box and the vehicle. During the welding process with the battery box, there is local stress concentration and a high risk of welding burn-through. This will greatly increase the probability of welding failure at the welding position during the entire life cycle of the battery box, leading to water ingress into the battery pack and affecting the safe use of the power battery.

[0003] To address the aforementioned issues, patent document publication number 222300785U discloses a battery pack upper housing mounting structure, a battery pack housing structure, and a battery pack. The battery pack upper housing mounting structure includes a mounting bracket disposed on the lower housing of the battery pack. This mounting bracket is formed by bending a plate and has a first plate and a second plate spaced apart vertically, as well as an intermediate plate disposed between the first and second plates. The first plate is connected to the lower housing of the battery pack, and the second plate has a mounting portion for mounting the upper housing of the battery pack. The intermediate plate smoothly transitions to both the first and second plates, but this design fails to solve the aforementioned problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, a local stress dispersion structure for the battery box is provided, which can effectively solve the stress concentration problem caused by welding the hanging ear and the battery box, reduce the risk of welding burn-through, improve the vibration resistance of the box, and reduce the impact of battery box weld failure on the airtightness and safety of the battery pack in later use. Utility Model Content

[0005] This utility model is designed to solve the aforementioned problems. Its purpose is to provide a battery box local stress dispersion structure that effectively addresses the stress concentration issue arising from the welding of the mounting lugs to the battery box body. This structure reduces the risk of weld burn-through, improves the box body's vibration resistance, and mitigates the impact of battery box weld failure on the battery pack's airtightness and safety during later use. To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a local stress dispersion structure for a battery box, characterized by including a battery box body and a hanging ear disposed on the battery box body, and a stress dispersion component disposed between the battery box body and the hanging ear.

[0007] The battery box local stress dispersion structure provided by this utility model may also have the following feature: the hanging ear includes a lower hanging ear piece and an upper hanging ear piece disposed on the lower hanging ear piece.

[0008] The local stress dispersion structure of the battery box provided by this utility model may also have the following features: the stress dispersion component includes a first connecting plate, the first connecting plate is connected to the battery box body, the first connecting plate and the battery box body are connected by resistance welding, and a first resistance welding point and a second resistance welding point are formed between the first connecting plate and the battery box body.

[0009] The battery box local stress dispersion structure provided by this utility model may also have the following feature: the first connecting plate and the upper piece of the hanging ear are connected by a welding method to form a first double-shielded plug weld and a first double-shielded weld seam.

[0010] The battery box local stress dispersion structure provided by this utility model may also have the following feature: the lower piece of the hanging ear is welded to the adjacent component to form a second MIG weld plug and a second MIG weld seam.

[0011] The local stress dispersion structure of the battery box provided by this utility model may also have the following features: the stress dispersion component includes a second connecting plate, the second connecting plate is connected to the battery box body, the second connecting plate and the battery box body are connected by resistance welding, and a third resistance welding point and a fourth resistance welding point are formed between the second connecting plate and the battery box body.

[0012] The battery box local stress dispersion structure provided by this utility model may also have the following features: a third and a fourth anti-mite weld are added to the second connecting plate, and the internal structural beams of the battery box body are subjected to resistance welding to form three layers of fifth resistance welds.

[0013] The battery box local stress dispersion structure provided by this utility model may also have the following feature: the second connecting plate and the upper piece of the hanging ear are connected by a welding method to form a third and a fifth MIG weld.

[0014] The battery box local stress dispersion structure provided by this utility model may also have the following feature: the lower piece of the hanging ear is welded to the adjacent parts to form a fourth two-dimensional weld plug and a sixth two-dimensional weld.

[0015] The technical effects of this utility model are as follows: The battery box local stress dispersion structure provided by this utility model includes a battery box body and a hanging ear set on the battery box body. A stress dispersion component is provided between the battery box body and the hanging ear. The stress dispersion component can effectively solve the problem of stress concentration caused by welding between the hanging ear and the battery box body, which helps to reduce the risk of welding burn-through, improve the vibration resistance of the box body, and reduce the impact of battery box weld failure on the airtightness and safety of the battery pack in later use.

[0016] Therefore, the local stress dispersion structure of the battery box provided by this utility model can effectively solve the problem of stress concentration caused by welding the hanging ears and the battery box, which helps to reduce the risk of welding burn-through, improve the vibration resistance of the box, and reduce the impact of battery box weld failure on the airtightness and safety of the battery pack in later use. Attached Figure Description

[0017] This manual includes the following figures, which illustrate the following:

[0018] Figure 1 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 1 of this utility model;

[0019] Figure 2 This is a schematic diagram of the local stress dispersion structure of the battery box in the top view direction in Embodiment 1 of this utility model;

[0020] Figure 3 This is a schematic diagram of the stress dispersion component in Embodiment 1 of this utility model;

[0021] Figure 4 This is a schematic diagram of the stress dispersion component in the front view direction of Embodiment 1 of this utility model;

[0022] Figure 5 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 2 of this utility model;

[0023] Figure 6 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 2 of this utility model in the top view direction;

[0024] Figure 7 This is a schematic diagram of the stress dispersion component in Embodiment 2 of this utility model;

[0025] Figure 8 This is a schematic diagram of the stress dispersion component in the front view direction of Embodiment 2 of this utility model.

[0026] The components in the diagram are labeled as follows: Battery housing body - 10, hook - 20, lower hook piece - 21, upper hook piece - 22, stress dispersion component - 30, first connecting plate - 31, first resistance weld - 311, second resistance weld - 312, first MIG weld plug weld - 313, first MIG weld seam - 314, second MIG weld plug weld - 315, second MIG weld seam - 316, second connecting plate - 32, third resistance weld - 321, fourth resistance weld - 322, third MIG weld seam - 323, fourth MIG weld seam - 324, fifth resistance weld - 325, third MIG weld plug weld - 326, fifth MIG weld seam - 327, fourth MIG weld plug weld - 328, sixth MIG weld seam - 329. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0028] <Example 1>

[0029] Figure 1 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the local stress dispersion structure of the battery box in the top view direction of Embodiment 1 of this utility model.

[0030] like Figure 1 and Figure 2 As shown in this embodiment, the local stress dispersion structure of the battery box provided by this utility model includes a battery box body 10 and a hanging ear 20 disposed on the battery box body 10. A stress dispersion component 30 is provided between the battery box body 10 and the hanging ear 20. The stress dispersion component 30 can effectively solve the problem of stress concentration caused by welding between the battery box body 10 and the hanging ear 20, which helps to reduce the risk of welding burn-through, improves the vibration resistance of the battery box body 10, and reduces the impact of weld failure on the battery pack airtightness and safety during later use. Therefore, the local stress dispersion structure of the battery box provided by this utility model can effectively solve the problem of stress concentration caused by welding between the battery box body 10 and the hanging ear 20, which helps to reduce the risk of welding burn-through, improves the vibration resistance of the box, and reduces the impact of weld failure on the battery pack airtightness and safety during later use.

[0031] The ear loop 20 includes a lower ear loop piece 21 and an upper ear loop piece 22 disposed on the lower ear loop piece 21, which helps to improve the structural strength of the ear loop 20.

[0032] Figure 3 This is a schematic diagram of the stress dispersion component in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the stress dispersion component in the front view direction of Embodiment 1 of this utility model.

[0033] like Figure 3 and Figure 4As shown, in this embodiment, the stress dispersion component 30 includes a first connecting plate 31, which is L-shaped. The first connecting plate 31 is connected to the battery box body 10. The first connecting plate 31 and the battery box body 10 are connected by resistance welding. A first resistance welding point 311 and a second resistance welding point 312 are formed between the first connecting plate 31 and the battery box body 10 to ensure that the battery box body 10 and the first connecting plate 31 are firmly welded.

[0034] The first connecting plate 31 and the upper piece of the hanging ear 22 are connected by welding. The first connecting plate 31 and the upper piece of the hanging ear 22 form a first MIG weld plug 313 and a first MIG weld 314. Since the upper piece of the hanging ear 22 is only reliably connected to the first connecting plate 31, the welding risk and welding stress concentration between the upper piece of the hanging ear 22 and the battery box body 10 can be avoided. At the same time, the vibration stress transmitted from the vehicle body through the hanging ear 20 is effectively dispersed to the first connecting plate 31.

[0035] The lower piece 21 of the lug is welded to the adjacent parts on the vehicle body, forming a second MIG weld plug 315 and a second MIG weld 316 between the lower piece 21 of the lug and the adjacent parts on the vehicle body, which effectively disperses the all-directional vibration stress transmitted from the vehicle body through the lug 20 to the first connecting plate 31.

[0036] In this first embodiment, the first connecting plate 31 can effectively solve the problems of stress concentration and welding burn-through risk caused by direct welding of the hanging ear 20 to the battery box body 10 in the traditional way, improve the feasibility of using MIG welding, transfer the stress of the lower hanging ear piece 21 and the upper hanging ear piece 22 to the position of the first connecting plate 31, improve the vibration resistance of the battery box body 10, and reduce the impact of the failure of the welding points of the battery box body 10 on the airtightness and safety of the battery pack in later use.

[0037] <Example 2>

[0038] In this second embodiment, the same structures and components as in the first embodiment are given the same numbers, and the same descriptions are omitted.

[0039] Figure 5 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 2 of this utility model; Figure 6 This is a schematic diagram of the local stress dispersion structure of the battery box in Embodiment 2 of this utility model in the top view direction; Figure 7 This is a schematic diagram of the stress dispersion component in Embodiment 2 of this utility model; Figure 8 This is a schematic diagram of the stress dispersion component in the front view direction of Embodiment 2 of this utility model.

[0040] like Figure 5 , Figure 6, Figure 7 as well as Figure 8 As shown, the stress dispersion component 30 includes a second connecting plate 32, which is a flat plate. The second connecting plate 32 is connected to the battery box body 10. The second connecting plate 32 and the battery box body 10 are connected by resistance welding. A third resistance welding point 321 and a fourth resistance welding point 322 are formed between the second connecting plate 32 and the battery box body 10 to ensure that the battery box body 10 and the second connecting plate 32 are firmly welded.

[0041] The second connecting plate 32 is provided with a third MIG weld 323 and a fourth MIG weld 324. The structural beams inside the battery box body 10 are subjected to resistance welding to form a third layer of fifth resistance weld points 325, which adds secondary protection and ensures the uniformity of stress distribution in the X / Y / Z vibration direction of the battery box body 10.

[0042] The second connecting plate 32 and the upper piece of the hanging ear 22 are connected by a welding method to form the third MIG weld 326 and the fifth MIG weld 327. Since the upper piece of the hanging ear 22 is only reliably connected to the second connecting plate 32 here, the welding risk and welding stress concentration between the upper piece of the hanging ear 22 and the battery box body 10 can be avoided. At the same time, the vibration stress transmitted from the vehicle body through the hanging ear 20 is effectively dispersed to the second connecting plate 32.

[0043] The lower piece 21 of the lug is welded to the adjacent parts on the vehicle body to form the fourth MIG weld 328 and the sixth MIG weld 329, which effectively disperses the all-directional vibration stress transmitted from the vehicle body through the lug 20 to the second connecting plate 32.

[0044] In this second embodiment, the second connecting plate 32 can effectively solve the problems of stress concentration and welding burn-through risk caused by direct welding of the hanging ear 20 to the battery box body 10 in the traditional way, improve the feasibility of using MIG welding, transfer the stress of the lower hanging ear piece 21 and the upper hanging ear piece 22 to the position of the second connecting plate 32, improve the vibration resistance of the battery box body 10, and reduce the impact of the failure of the welding points of the battery box body 10 on the airtightness and safety of the battery pack in later use.

[0045] The role and effect of the embodiments

[0046] In this first embodiment, the local stress dispersion structure of the battery box provided by this utility model includes a battery box body 10 and a hanging ear 20 disposed on the battery box body 10. A stress dispersion component 30 is provided between the battery box body 10 and the hanging ear 20. The stress dispersion component 30 can effectively solve the problem of stress concentration caused by welding between the battery box body 10 and the hanging ear 20, which helps to reduce the risk of welding burn-through, improves the vibration resistance of the battery box body 10, and reduces the impact of weld failure on the battery pack airtightness and safety during later use. Thus, the local stress dispersion structure of the battery box provided by this utility model can effectively solve the problem of stress concentration caused by welding between the battery box body 10 and the hanging ear 20, which helps to reduce the risk of welding burn-through, improves the vibration resistance of the box, and reduces the impact of weld failure on the battery pack airtightness and safety during later use.

[0047] The first connecting plate 31 can effectively solve the problems of stress concentration and welding burn-through risk caused by direct welding of the hanging ear 20 to the battery box body 10 in the traditional way, improve the feasibility of using MIG welding, transfer the stress of the lower hanging ear piece 21 and the upper hanging ear piece 22 to the position of the first connecting plate 31, improve the vibration resistance of the battery box body 10, and reduce the impact of the failure of the welding points of the battery box body 10 on the airtightness and safety of the battery pack in later use.

[0048] The second connecting plate 32 can effectively solve the problems of stress concentration and welding burn-through risk caused by direct welding of the hanging ear 20 to the battery box body 10 in the traditional way, improve the feasibility of using MIG welding, transfer the stress of the lower hanging ear piece 21 and the upper hanging ear piece 22 to the position of the second connecting plate 32, improve the vibration resistance of the battery box body 10, and reduce the impact of the failure of the welding points of the battery box body 10 on the airtightness and safety of the battery pack in later use.

[0049] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A local stress dispersion structure for a battery box, characterized in that, The device includes a battery housing body (10) and a hanging ear (20) disposed on the battery housing body (10). A stress dispersion component (30) is provided between the battery housing body (10) and the hanging ear (20). The stress dispersion component (30) includes a first connecting plate (31), which is connected to the battery housing body (10). The first connecting plate (31) and the battery housing body (10) are connected by resistance welding. A first resistance welding point (311) and a second resistance welding point (312) are formed between the first connecting plate (31) and the battery housing body (10). The stress dispersion component (30) also includes a second connecting plate (32), which is connected to the battery housing body (10). The second connecting plate (32) and the battery housing body (10) are connected by resistance welding. A third resistance welding point (321) and a fourth resistance welding point (322) are formed between the second connecting plate (32) and the battery housing body (10).

2. The battery box local stress dispersion structure according to claim 1, characterized in that, The ear loop (20) includes a lower ear loop piece (21) and an upper ear loop piece (22) disposed on the lower ear loop piece (21).

3. The battery box local stress dispersion structure according to claim 2, characterized in that, The first connecting plate (31) and the upper piece of the hanging ear (22) are connected by a welding method to form a first MIG weld plug (313) and a first MIG weld seam (314).

4. The battery box local stress dispersion structure according to claim 3, characterized in that, The lower piece (21) of the hanging ear is welded to the adjacent component to form a second MIG weld plug (315) and a second MIG weld seam (316).

5. The battery box local stress dispersion structure according to claim 4, characterized in that, A third and a fourth MIG weld (324) are added to the second connecting plate (32). The internal structural beams of the battery box body (10) are subjected to resistance welding to form a three-layer fifth resistance weld point (325).

6. The battery box local stress dispersion structure according to claim 5, characterized in that, The second connecting plate (32) is connected to the upper piece (22) of the hanging ear by a welding method to form a third MIG weld (326) and a fifth MIG weld (327).

7. The battery box local stress dispersion structure according to claim 6, characterized in that, The lower piece (21) of the hanging ear is welded to the adjacent component to form the fourth MIG weld plug (328) and the sixth MIG weld (329).

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