A battery aluminum casing with reinforcing ribs

Abstract

This utility model discloses a battery aluminum shell with reinforcing ribs, including an aluminum shell body, an integrated top cover disposed on the top of the aluminum shell body, a pressure relief center boss and multiple strip-shaped side stamping grooves formed on the surface of the top cover by mechanical stamping process, and a reinforcing structure disposed on the top cover, including annular reinforcing ribs surrounding the pressure relief center boss; and multiple auxiliary heat dissipation structures disposed on the circumferential surface of the aluminum shell body. This application significantly improves the overall performance of the battery aluminum shell by setting annular reinforcing ribs around the explosion-proof valve area on the inner side of the battery aluminum shell top cover, thereby improving the impact resistance of the battery aluminum shell top cover, reducing the incidence of bulging, and effectively preventing structural failure caused by external force or internal pressure; and the auxiliary heat dissipation structure designed on the circumferential surface of the aluminum shell increases the heat dissipation area and improves the heat dissipation performance during battery operation.

Description

Technical Field

[0001] This utility model belongs to the field of new energy battery aluminum shell technology, specifically relating to a battery aluminum shell with reinforcing ribs. Background Technology

[0002] With the continuous increase in the energy density of lithium-ion batteries, the risk of internal gas generation pressure and thermal runaway has increased significantly. To ensure battery safety, the top cover of existing cylindrical aluminum battery casings typically integrates an explosion-proof valve structure. This explosion-proof valve structure uses a mechanical stamping process to form a circular central stamping groove and strip-shaped side stamping grooves on the surface of the top cover. The circular central stamping groove contains a circular central boss, and annular grooves are machined along the edge of the boss. When the internal pressure of the battery abnormally increases, the annular grooves rupture first, forming a directional pressure relief channel to prevent explosion or flame propagation. The pressure relief mechanism: the thin-walled design of the stamping groove and grooves allows the explosion-proof valve to open rapidly under specific pressures (e.g., 0.8-1.2 MPa), achieving pressure release and flame guidance control.

[0003] However, the existing aluminum battery casing with explosion-proof valve structure has the following drawbacks in actual use:

[0004] 1. Insufficient mechanical strength of the top cover: Due to the reduced material thickness in the stamping groove and annular groove area of ​​the explosion-proof valve, the impact resistance of the top cover is reduced in some areas. Under conditions of battery assembly, transportation or vibration, the top cover is prone to bulging and deformation due to external pressure or internal pressure fluctuations, and may even cause accidental cracking of the groove, resulting in sealing failure or leakage risk.

[0005] 2. Limited heat dissipation efficiency: The heat dissipation of the cylindrical aluminum shell mainly relies on natural convection, but the existing design does not optimize the heat dissipation structure, and the battery cannot get good heat dissipation when charging and discharging at high rates.

[0006] Therefore, this utility model proposes a battery aluminum shell with reinforcing ribs. Utility Model Content

[0007] The purpose of this invention is to provide a battery aluminum casing with reinforcing ribs to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a battery aluminum shell with reinforcing ribs, comprising an aluminum shell body, an integral top cover disposed at the top of the aluminum shell body, a pressure relief center boss and multiple strip-shaped side stamping grooves formed on the surface of the top cover by mechanical stamping process, and further comprising...

[0009] The reinforcing structure provided on the top cover includes annular reinforcing ribs surrounding the pressure relief center boss;

[0010] Multiple auxiliary heat dissipation structures are provided on the circumferential surface of the aluminum shell body, including multiple strip-shaped heat dissipation grooves formed on the outer surface of the aluminum shell body.

[0011] Preferably, the annular reinforcing rib is integrally formed on the inner surface of the top cover by a casting process.

[0012] Preferably, the annular reinforcing rib is formed by mechanical stamping from the outer surface of the top cover.

[0013] Preferably, the pressure relief center boss and the strip-shaped side stamping groove are at the same height, and there is a height difference between the annular reinforcing rib and the strip-shaped side stamping groove, which is 0.15mm-0.25mm.

[0014] Preferably, the reinforcing structure further includes a plurality of extended reinforcing ribs disposed outside the annular reinforcing rib, and the extended reinforcing ribs are formed in the same process as the annular reinforcing ribs and are formed synchronously with the annular reinforcing ribs.

[0015] Preferably, the auxiliary heat dissipation structure further includes an air circulation hole that passes through and is formed between two adjacent strip-shaped heat dissipation grooves. The auxiliary heat dissipation structure also includes an inner arc-shaped groove formed on the inner wall of the aluminum shell body, and the position of the inner arc-shaped groove corresponds to the strip-shaped heat dissipation groove. An inner arc-shaped reinforcing plate is fixed in the inner arc-shaped groove.

[0016] Preferably, the outer surface of the inner arc-shaped reinforcing plate is provided with a plurality of integral strip-shaped protrusions, and the inner wall of the inner arc-shaped groove is provided with a plurality of strip-shaped slots for the strip-shaped protrusions to be inserted.

[0017] Preferably, the outer diameter of the aluminum shell body is 30-70mm.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting an annular reinforcing rib around the explosion-proof valve area on the inner side of the battery aluminum shell top cover, this application significantly improves the overall performance of the battery aluminum shell, thereby increasing the impact resistance of the battery aluminum shell top cover, reducing the bulging rate, and effectively preventing structural failure caused by external force or internal pressure; at the same time, the annular reinforcing rib maintains a safe distance from the explosion-proof valve, ensuring that the annular groove breaks preferentially under the preset pressure and that the pressure relief direction is not interfered with the flame jet path; and an auxiliary heat dissipation structure is designed on the circumferential surface of the aluminum shell, which increases the heat dissipation area and improves the heat dissipation performance during battery operation. Attached Figure Description

[0019] Figure 1 This is an inner side view of Embodiment 2 of the present invention;

[0020] Figure 2 This utility model Figure 1 A magnified view of a portion of region A in the middle;

[0021] Figure 3 This is a schematic diagram of the outer side of the present invention;

[0022] Figure 4 This is a schematic diagram of the outer side of Embodiment 3 of this utility model;

[0023] Figure 5 This is a schematic diagram of the inner side of the present invention;

[0024] Figure 6 This is a schematic diagram of the auxiliary heat dissipation structure of this utility model;

[0025] Figure 7 This is a cross-sectional view of the auxiliary heat dissipation structure of this utility model;

[0026] Figure 8 This utility model Figure 7 A magnified view of a portion of region B in the middle;

[0027] In the diagram: 1. Aluminum shell body; 2. Top cover; 3. Pressure relief center boss; 4. Strip-shaped side stamping groove; 5. Annular reinforcing rib; 6. Extended reinforcing rib; 7. Auxiliary heat dissipation structure; 71. Strip-shaped heat dissipation groove; 72. Air circulation hole; 73. Inner arc groove; 731. Strip-shaped slot; 74. Inner arc-shaped reinforcing plate; 741. Strip-shaped protrusion. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example 1

[0030] Please see Figure 3 and Figure 5This is the first embodiment of the present invention, which provides the following technical solution: a battery aluminum shell with reinforcing ribs, comprising an aluminum shell body 1, an integral top cover 2 disposed at the top of the aluminum shell body 1, a pressure relief center boss 3 and multiple strip-shaped side stamping grooves 4 formed on the surface of the top cover 2 by mechanical stamping process. The pressure relief center boss 3 and the multiple strip-shaped side stamping grooves 4 are all boss structures when viewed from the inner surface of the top cover 2, and are all groove structures when viewed from the outer surface of the top cover 2. In addition, the surface of the top cover 2 is also processed with annular engravings at the edge of the pressure relief center boss 3. The above structures are all prior art. The principle is simple: when the internal pressure of the aluminum shell body 1 rises abnormally, the strip-shaped side stamping groove 4 and the pressure relief center boss 3 are stamped into thin walls, and the outer side of the pressure relief center boss 3 is also machined with annular grooves. When the internal pressure of the aluminum shell body 1 rises abnormally, the annular grooves will be squeezed open under the pressure, causing the pressure relief center boss 3 to be squeezed, thereby opening the pressure relief channel at the top center of the top cover 2, realizing rapid and directional pressure relief, effectively limiting the pressure relief direction and the flame jet direction, and reducing the risk of accident spread.

[0031] Also includes

[0032] The reinforcing structure provided on the top cover 2 includes annular reinforcing ribs 5 surrounding the pressure relief center boss 3, which improves the impact resistance of the entire battery aluminum shell and the top cover 2 and prevents the top cover 2 from bulging.

[0033] In this embodiment, preferably, the annular reinforcing rib 5 is integrally formed on the inner surface of the top cover 2 by a casting process.

[0034] In this embodiment, preferably, the pressure relief center boss 3 and the strip-shaped side stamping groove 4 are at the same height, and there is a height difference between the annular reinforcing rib 5 and the strip-shaped side stamping groove 4, which is 0.15mm. This makes the annular reinforcing rib 5 thinner than the strip-shaped side stamping groove 4 on the inner side of the top cover 2. This allows the gas to flow smoothly over the annular reinforcing rib 5 to the pressure relief center boss 3 for normal pressure relief when the internal pressure of the aluminum shell body 1 increases. This ensures that the annular reinforcing rib 5 does not affect the normal operation of the original pressure relief center boss 3.

[0035] In this embodiment, preferably, the outer diameter of the aluminum shell body 1 is 30-70mm.

[0036] Example 2

[0037] Please see Figures 1 to 3This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but the difference is that the reinforcing structure also includes a plurality of extended reinforcing ribs 6 disposed on the outside of the annular reinforcing rib 5. The extended reinforcing ribs 6 are formed in the same process as the annular reinforcing rib 5 and are formed synchronously with the annular reinforcing rib 5, so as to further extend and strengthen, thereby improving the impact resistance of the entire battery aluminum shell.

[0038] Example 3

[0039] Please see Figure 1 , Figure 2 and Figure 4 This is the third embodiment of the present invention. This embodiment is based on the previous embodiment, except that the annular reinforcing rib 5 is formed by mechanical stamping from the outer surface of the top cover 2, thereby forming an annular protruding structure on the inner side of the top cover 2.

[0040] Example 4

[0041] Please see Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 8 This is the fourth embodiment of the present invention. This embodiment is based on the previous embodiment, but with the difference that it also includes a plurality of auxiliary heat dissipation structures 7 disposed on the circumferential surface of the aluminum shell body 1. These structures include a plurality of strip-shaped heat dissipation grooves 71 formed on the outer surface of the aluminum shell body 1. The strip-shaped heat dissipation grooves 71 can increase the contact area with air during subsequent operation of the aluminum shell body 1, increase the heat exchange efficiency with air, play an auxiliary heat dissipation role, and increase the heat dissipation performance of the battery during operation.

[0042] In this embodiment, preferably, the auxiliary heat dissipation structure 7 further includes an air circulation hole 72 that passes through the space between two adjacent strip-shaped heat dissipation grooves 71, which can increase the air circulation between the two adjacent strip-shaped heat dissipation grooves 71 and further increase the heat exchange efficiency with the air. The auxiliary heat dissipation structure 7 also includes an inner arc-shaped groove 73 that is formed on the inner wall of the aluminum shell body 1, and the position of the inner arc-shaped groove 73 corresponds to the strip-shaped heat dissipation groove 71. An inner arc-shaped reinforcing plate 74 is fixed in the inner arc-shaped groove 73, which can provide auxiliary reinforcement to the strip-shaped heat dissipation groove 71 and ensure the mechanical strength of the aluminum shell body 1.

[0043] In this embodiment, preferably, the outer surface of the inner arc-shaped reinforcing plate 74 is provided with a plurality of integral strip-shaped protrusions 741, both of which are made of aluminum alloy. The inner wall of the inner arc-shaped groove 73 is provided with a plurality of strip-shaped slots 731 for the strip-shaped protrusions 741 to be inserted. When the inner arc-shaped reinforcing plate 74 is fixed inside the inner arc-shaped groove 73, the strip-shaped protrusions 741 will be inserted into the strip-shaped slots 731. This can limit the inner arc-shaped reinforcing plate 74 and also better conduct the temperature inside the aluminum shell body 1 to the inner wall of the strip-shaped heat dissipation groove 71 through the inner arc-shaped reinforcing plate 74 and the strip-shaped protrusions 741.

[0044] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A battery aluminum can with reinforcing ribs, comprising an aluminum can body (1), an integral top cover (2) arranged at the top end of the aluminum can body (1), a pressure relief center boss (3) formed on the surface of the top cover (2) by a mechanical stamping process, and a plurality of strip-shaped side stamping grooves (4), characterized in that: Also includes The reinforcing structure provided on the top cover (2) includes an annular reinforcing rib (5) surrounding the pressure relief center boss (3); Multiple auxiliary heat dissipation structures (7) are provided on the circumferential surface of the aluminum shell body (1), including multiple strip-shaped heat dissipation grooves (71) opened on the outer surface of the aluminum shell body (1).

2. The battery can with reinforcing ribs according to claim 1, characterized in that: The annular reinforcing rib (5) is integrally formed on the inner surface of the top cover (2) by casting process.

3. The battery can with reinforcing ribs according to claim 1, characterized in that: The annular reinforcing rib (5) is formed by mechanical stamping from the outer surface of the top cover (2).

4. The battery can with reinforcing ribs according to claim 1, characterized in that: The pressure relief center boss (3) and the strip-shaped side stamping groove (4) are at the same height, and there is a height difference between the annular reinforcing rib (5) and the strip-shaped side stamping groove (4), which is 0.15mm-0.25mm.

5. The battery can with reinforcing ribs according to claim 1, characterized in that: The reinforcing structure also includes a plurality of extended reinforcing ribs (6) disposed outside the annular reinforcing rib (5), and the extended reinforcing ribs (6) are formed in the same process as the annular reinforcing rib (5) and are formed synchronously with the annular reinforcing rib (5).

6. The battery can with reinforcing ribs according to claim 1, characterized in that: The auxiliary heat dissipation structure (7) also includes an air circulation hole (72) that runs through between two adjacent strip heat dissipation grooves (71). The auxiliary heat dissipation structure (7) also includes an inner arc groove (73) that runs on the inner wall of the aluminum shell body (1). The position of the inner arc groove (73) corresponds to the strip heat dissipation groove (71). An inner arc reinforcing plate (74) is fixed in the inner arc groove (73).

7. The battery can with reinforcing ribs according to claim 6, characterized in that: The outer surface of the inner arc-shaped reinforcing plate (74) is provided with a plurality of integral strip-shaped protrusions (741), and the inner wall of the inner arc-shaped groove (73) is provided with a plurality of strip-shaped slots (731) for the strip-shaped protrusions (741) to be inserted.

8. The battery can with reinforcing ribs according to claim 1, characterized in that: The outer diameter of the aluminum shell body (1) is 30-70mm.

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