A battery casing with stress grooves and a battery

Abstract

This utility model discloses a battery casing with stress grooves, comprising: a casing body, wherein at least one stress groove is provided at the upper end of the casing body, the depth of the stress groove is 0.03-0.7 mm, and the stress groove forms a gap with the edge of the casing body. This utility model also provides a battery. By stamping stress grooves on square or irregularly shaped casings or covers, these stress grooves (which can be recesses or protrusions) enhance the battery's resistance to deformation and improve its thermal management performance. This maintains the battery's energy density while enhancing structural reliability, buffering thermal expansion stress distribution, ensuring surface flatness, and mitigating dynamic deformation. Furthermore, the presence of stress grooves increases the contact area between the battery surface and the external environment, improving thermal conductivity.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a battery casing and battery with stress grooves. Background Technology

[0002] Currently, conventional square and irregularly shaped steel-cased batteries generally use relatively thin metal materials, such as copper-iron, aluminum-nickel, and stainless steel, as the battery metal casing in order to improve the energy density in space. During the battery packaging process, the battery casing will become arched and uneven due to laser high-temperature welding, low-temperature environment, capacity formation, and charge-discharge cycle processing, forming a wavy appearance and dynamic deformation, which seriously affects the battery appearance, the battery's resistance to deformation, and thermal management performance. Utility Model Content

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide a battery casing and battery with stress grooves. This invention improves the thermal management performance of the battery, maintains the battery energy density while enhancing structural reliability, buffering thermal expansion stress distribution, and ensuring appearance flatness and dynamic deformation.

[0004] To achieve the above objectives, this utility model provides a battery casing with stress grooves, comprising: the casing body includes a bottom shell and a cover, and at least one stress groove on the bottom shell and / or the cover, the stress groove having a depth of 0.03 to 0.7 mm, and the stress groove forming a gap with the edge of the casing body.

[0005] Furthermore, the cross-section of the stress groove can be in the form of a T-shape, a treble shape, a V-shape, an O-shape, a U-shape, a C-shape, a D-shape, an S-shape, a semi-circle, an ellipse, a trapezoid, a spiral, a hexagon, an irregular shape, a ring shape, a mesh shape, a 45-degree diagonal pattern, a cross diagonal pattern, or other similar shapes.

[0006] Furthermore, the spacing is 1mm to 1.8mm. Optimizing the spacing can directly improve the reliability of thermal management performance in buffering thermal expansion forces.

[0007] Furthermore, the stress groove is a groove or a boss. Grooves or bosses enhance the battery's resistance to deformation and improve its thermal management performance, maintaining battery energy density while enhancing structural reliability, buffering thermal expansion stress distribution, ensuring appearance flatness, and mitigating dynamic deformation. They also increase the contact area between the battery surface and the external environment, improving thermal conductivity.

[0008] Furthermore, the stress groove is a loop structure formed by continuous grooves, or an array of dot-shaped grooves or strip-shaped grooves.

[0009] Furthermore, the bottom of the stress groove is either arc-shaped or flat. This increases the area at the top of the shell, reduces the heat conduction range, and effectively achieves cooling and deformation resistance.

[0010] Furthermore, the stress groove includes a first arc and a second arc, which are tangentially connected to both sides of the arc-shaped bottom, and the other side of the first and second arcs away from the bottom is tangentially connected to the shell body. By setting two tangentially connected arcs, the area of ​​the top part of the shell can be further expanded to reduce the heat conduction range, thereby effectively achieving the effect of cooling and preventing deformation.

[0011] Furthermore, the two sides of the stress groove are inclined, and the connection between the two sides and the bottom makes the cross-section of the stress groove "V". While ensuring a certain area, the V-shaped angled structure is designed because the sharp geometry of this structure can effectively concentrate stress, significantly increase the stress at the root of the groove, induce local hardening, release local pressure, and improve fatigue strength, toughness, elasticity, and ductility. This achieves a more sensitive high-temperature deformation resistance and maintains the flatness of the appearance.

[0012] Furthermore, the stress groove also includes a third and fourth circular arc, and a fifth and sixth circular arc, which are tangentially connected. The third circular arc is connected to the shell body, the fourth circular arc is connected to one side of the bottom, the fifth circular arc is connected to the shell body, and the sixth circular arc is connected to the other side of the bottom. This flat-bottomed stress groove structure further expands the cover area, reduces the heat conduction range, and acts as a main beam to support the dynamic deformation of the entire plane and improve deformation resistance. It effectively buffers thermal expansion forces during peripheral welding, charge-discharge cycles, and various high-temperature environments, thereby improving battery cycle life.

[0013] This utility model also provides a battery, including the battery cell and a battery housing for accommodating the battery cell, wherein the battery housing is the aforementioned battery housing with stress grooves.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] This invention utilizes stress grooves stamped on square or irregularly shaped battery casings or covers. These stress grooves can be recesses or protrusions. The stress grooves enhance the battery's resistance to deformation and improve its thermal management performance. They maintain the battery's energy density while enhancing structural reliability, buffering thermal expansion stress distribution, ensuring appearance flatness, and mitigating dynamic deformation. Furthermore, the presence of stress grooves increases the contact area between the battery surface and the external environment, thereby improving thermal conductivity. Attached Figure Description

[0016] To more clearly illustrate the technology in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a battery casing with stress grooves according to the present invention;

[0018] Figure 2 This is a schematic diagram of different stress grooves in a battery casing with stress grooves according to the present invention;

[0019] Figure 3 This is another schematic diagram of different stress grooves in a battery casing with stress grooves according to this utility model;

[0020] Figure 4 This is another schematic diagram of different stress grooves in a battery casing with stress grooves according to the present invention;

[0021] Figure 5 This is a cross-sectional schematic diagram along line AA of Embodiment 1 of this utility model;

[0022] Figure 6 This is a cross-sectional schematic diagram of Embodiment 2 of this utility model;

[0023] Figure 7 This is a cross-sectional schematic diagram of Embodiment 3 of this utility model.

[0024] The diagram includes:

[0025] 1. Shell body; 11. Stress groove; 111. First arc; 112. Second arc; 113. Side; 114. Third arc; 115. Fourth arc; 116. Fifth arc; 117. Sixth arc; 118. Bottom; 12. Cover; 13. Spacing. Detailed Implementation

[0026] The technology of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second", such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0029] like Figures 1 to 7 The present invention discloses a battery casing with stress grooves and a battery, as detailed below:

[0030] Example 1

[0031] Please see Figure 1 This utility model provides a battery casing with stress grooves, comprising: the casing body 1 including a bottom shell 14 and a cover 12, wherein at least one stress groove 11 is provided on the bottom shell 14 and / or the cover 12. The stress groove 11 can be configured as a groove recessed into the bottom shell 14 and / or the cover 12 or a protruding boss. Generally, the stress groove 11 is configured as a groove. In this embodiment, the stress groove 11 is provided on the cover 12 as an example. Of course, in other embodiments, the stress groove 11 can be provided on the bottom shell 14, or on both the bottom shell 14 and the cover 12. Both 1 and 2 are provided with stress grooves 11, which are determined according to the requirements. In this embodiment, the stress grooves 11 are provided on the end face of the cover 12. Preferably, the depth of the stress grooves 11 is 0.03 to 0.7 mm, that is, the depth of the stress grooves 11 can be 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm or 0.7 mm. The depth is usually controlled between 0.03 and 0.7 mm. If it is too deep, it will affect the structural strength and lose energy density; if it is too shallow, the buffering effect will be insufficient.

[0032] Furthermore, to optimize the reliability of the stress groove 11 and the cover 12 in buffering expansion forces, a distance 13 is formed between the stress groove 11 and the edge of the shell body 1. That is, in this embodiment, the distance 13 from the stress groove 11 to the weld between the cover 12 and the shell body 1 is 1mm to 1.8mm. Similarly, this distance 13 can be adjusted according to actual conditions and can be set to 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, or 1.8mm. By optimizing the distance, the reliability of the thermal management performance in buffering thermal expansion forces can be directly improved.

[0033] In this embodiment, the shape of the stress groove 11 can be changed according to actual needs. For example, the cross-section of the stress groove 11 can be a two-shaped, three-shaped, V-shaped, O-shaped, U-shaped, C-shaped, D-shaped, S-shaped, semi-circular, elliptical, trapezoidal, spiral, hexagonal, irregular, ring-shaped, grid-like, 45-degree diagonal, cross diagonal, or other similar shapes to adapt to different scenarios or shell requirements. This embodiment uses the stress groove 11 as a continuous groove forming a loop structure for illustration. The number of such stress grooves 11 can also be adjusted. Figure 1 and Figure 2 The ring-shaped wrapping method is set on the end face of the cover 12. The number is not limited. It can be one, two or more as needed. The setting of several stress grooves 11 can multiply the deformation resistance.

[0034] For example Figure 3 As shown, the stress groove 11 can be composed of a number of point-shaped grooves arranged in a row or array. These point-shaped grooves can be distributed on the surface of the cover 12 and / or the shell body 1, thereby significantly increasing the surface area of ​​the cover 12 and the shell body 1 and reducing the heat conduction range, which can effectively achieve the effect of cooling and anti-deformation.

[0035] For example Figure 4 The stress groove 11 shown can also be a strip groove. When the stress groove 11 is set as a strip groove, its arrangement can be longitudinally parallel, transversely parallel, or crisscrossed. The specific direction and number can be determined according to actual needs and are not limited one by one. This kind of groove also achieves the ability to multiply the resistance to deformation.

[0036] Regarding the structure of stress groove 11, such as Figure 5 As shown, the bottom 118 of the stress groove 11 in this embodiment is arc-shaped. The stress groove 11 also includes a first arc 111 and a second arc 112. The first arc 111 and the second arc 112 are tangentially connected to both sides of the arc-shaped bottom 118, and the other side of the first arc 111 and the second arc 112 away from the bottom 118 are tangentially connected to the cover 12. That is, the first and last ends of the first arc 111 are connected to the cover 12 and the arc-shaped bottom 118, respectively, and the horizontal extension line of the cover 12 is tangential to the first arc 111. Similarly, the extension of the connection between the arc-shaped bottom 118 and the first arc 111 is tangential to the first arc 111. By setting two tangentially connected arcs, the area of ​​the top part of the shell can be further expanded to reduce the heat conduction range, which can effectively achieve the effect of cooling and anti-deformation.

[0037] Example 2

[0038] The difference between this embodiment and Embodiment 1 lies in the change of the structure of the stress groove 11. Specifically, in this embodiment, the bottom 118 of the stress groove 11 is arc-shaped, and the two sides 113 of the stress groove 11 are inclined. The two sides 113 are connected to the bottom 118, making the cross-section of the stress groove 11 V-shaped. The included angle of the two side plates 113 is controlled between 1° and 120°, preferably between 1° and 90°. While ensuring a certain area, the V-shaped included angle structure is used because the sharp geometric shape of this structure can effectively concentrate stress, significantly increase the stress at the root of the groove, induce local hardening, release local pressure, and improve fatigue strength, toughness, elasticity, and ductility. This achieves a more sensitive high-temperature deformation resistance and maintains the appearance flatness. Everything else is the same as in Embodiment 1, and the technical effects of Embodiment 1 are also achieved.

[0039] Example 3

[0040] The difference between this embodiment and Embodiment 1 lies in the change of the structure of the stress groove 11, specifically, as follows: Figure 7 As shown, in this embodiment, the bottom 118 of the stress groove 11 is a flat surface. The stress groove 11 also includes a third arc 114 and a fourth arc 115 tangentially connected, as well as a fifth arc 116 and a sixth arc 117 tangentially connected. The third arc 114 is connected to the shell body 1, the fourth arc 115 is connected to one side of the bottom 118, the fifth arc 116 is connected to the shell body 1, and the sixth arc 117 is connected to the other side of the bottom 118. This flat-bottomed stress groove 11 structure further expands the cover area, reduces the heat conduction range, and can also serve as a main beam to support the dynamic deformation of the entire plane and improve deformation resistance. It can effectively buffer thermal expansion forces during battery peripheral welding, charge-discharge cycles, and various high-temperature environments, thereby improving battery cycle life. Everything else is the same as in Embodiment 1, and the technical effects of Embodiment 1 are also achieved.

[0041] Example 4

[0042] This embodiment 4 also provides a battery, including a battery cell and a battery housing for housing the battery cell, wherein the battery housing is any of the battery housings with stress grooves described in embodiments 1-3 above.

[0043] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery case having a stress groove, characterized by, include: The shell body (1) includes a bottom shell (14) and a cover (12). At least one stress groove (11) is provided on the bottom shell (14) and / or the cover (12). The depth of the stress groove (11) is 0.03 to 0.7 mm. The stress groove (11) forms a gap (13) with the edge of the shell body (1).

2. The battery case having a stress groove according to claim 1, wherein The cross-section of the stress groove (11) is in the form of a T-shape, a ternary shape, a V-shape, an O-shape, a U-shape, a C-shape, a D-shape, an S-shape, a semi-circular shape, an ellipse, a trapezoid, a spiral shape, a hexagon, an irregular shape, a ring shape, a grid shape, a 45-degree diagonal pattern, or a cross diagonal pattern.

3. The battery case having a stress groove according to claim 1, wherein The spacing (13) is 1 mm to 1.8 mm.

4. The battery case having a stress groove according to claim 1, wherein The stress groove (11) is a groove or a boss.

5. The battery case having a stress groove according to claim 1, wherein The stress groove (11) is a loop structure formed by continuous grooves or a row of dot-shaped grooves or strip-shaped grooves.

6. The battery case having a stress groove according to claim 1, wherein The bottom (118) of the stress groove (11) is arc-shaped or flat.

7. The battery case having a stress groove according to claim 6, wherein The stress groove (11) includes a first arc (111) and a second arc (112). The first arc (111) and the second arc (112) are tangentially connected to both sides of the arc-shaped bottom (118), and the other side of the first arc (111) and the second arc (112) away from the bottom (118) is tangentially connected to the shell body (1).

8. The battery case having a stress groove according to claim 6, wherein The two sides (113) of the stress groove (11) are inclined, and the two sides (113) are connected to the bottom (118) so that the cross section of the stress groove (11) is "V" shaped.

9. The battery case having a stress groove according to claim 6, wherein The stress groove (11) also includes a third arc (114) and a fourth arc (115) connected tangentially, as well as a fifth arc (116) and a sixth arc (117) connected tangentially. The third arc (114) is connected to the shell body (1), the fourth arc (115) is connected to one side of the bottom (118), the fifth arc (116) is connected to the shell body (1), and the sixth arc (117) is connected to the other side of the bottom (118).

10. A battery, characterized by include: A battery cell and a battery housing for housing the battery cell, wherein the battery housing is a battery housing with stress grooves as described in any one of claims 1-9.

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