Battery shell, battery and electric device

Abstract

The utility model provides a battery shell, a battery and an electric device, and relates to the technical field of power batteries, the battery shell comprises a shell body with an accommodating cavity inside, and at least one end of the accommodating cavity is open; the shell body comprises two side walls which are oppositely arranged along the thickness direction of the shell body, at least one side wall of the shell body is provided with an arched part which is arranged close to the opening, and the arched part is outwards arched relative to the side wall. The design of the arch-out part is also beneficial to improving the structural strength of the side wall, so that the side wall is more stable, the structure weakening caused by the opening is effectively prevented, a stable basic structure is provided for the pole group to enter the shell, the pole group can be conveniently assembled into the battery shell, and the service life of the battery shell is prolonged. Therefore, the processing efficiency is improved, and the yield is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to power battery technical field, especially the battery shell, and simultaneously, the utility model relates to a kind of battery and electric device with the battery shell. BACKGROUND

[0002] Battery shell is the shell structure for accommodating and protecting the internal components of battery, usually made of material with certain strength and corrosion resistance. Battery shell not only provides physical support and protection for the internal components of battery, such as pole group, electrolyte, electrode, etc., to prevent them from being subjected to mechanical impact, collision and extrusion from outside, but also plays a sealing role to prevent electrolyte leakage and impurities such as air and moisture from outside entering the inside of battery, thereby ensuring the performance and safety of battery.

[0003] Common battery shell materials include metal (such as aluminum, steel, etc.), plastic (such as polypropylene, polycarbonate, etc.) and composite materials, etc. Among them, metal materials have high strength and good thermal conductivity, but the battery shell made of metal material, for example, the metal shell made of aluminum, has a concave end at one end of the open end, which makes it difficult to install the pole into the shell, thereby affecting the production efficiency of the battery, and even producing defective products. SUMMARY

[0004] Therefore, the utility model aims to provide a battery shell to facilitate the installation of pole group into the shell.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A battery shell includes a shell body having a cavity inside, and at least one end of the cavity is open.

[0007] The shell body includes two side walls arranged opposite to each other in the thickness direction, and at least one of the side walls is provided with an arching portion adjacent to the opening, and the arching portion arches outward relative to the side wall.

[0008] Further, in the length direction of the shell body, the distance L between the arching portion and the corresponding end of the side wall satisfies: 1mm≤L≤30mm; and / or, the cross section of the arching portion is in the shape of "U".

[0009] Further, in the thickness direction of the shell body, the height h of the arching portion satisfies: 0.3mm≤h≤10mm.

[0010] Further, in the width direction of the side wall, the arching portion is in the shape of a long strip extending from the middle of the side wall to both sides.

[0011] Further, the ratio M between the length a of the arching portion and the width B of the side wall satisfies:

[0012] 0.6≤M≤0.96.

[0013] Further, the length a of the arching portion satisfies: 1mm≤a≤30mm.

[0014] Further, the ratio N between the width b of the arching portion and the length A of the side wall satisfies:

[0015] 0.02≤N≤0.40.

[0016] Further, the arching portion is arranged on both of the side walls, and the two arching portions are symmetrically arranged.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The battery shell has the arching portion arranged on the side wall adjacent to the opening, which can disperse the stress near the opening on the side wall, avoids stress concentration on the opening edge, reduces the concave phenomenon of the side wall caused by stress concentration, the design of the arching portion also helps to improve the structural strength of the side wall, makes the side wall more stable, effectively prevents the structural weakening caused by the opening, provides a stable basic structure for the battery shell, and then helps to assemble the pole group into the battery shell, thereby improving the processing efficiency and the yield.

[0019] In addition, in the length direction of the shell body, when the spacing L between the arching portion and the corresponding end of the side wall is 1mm to 30mm, the stress is more evenly distributed on the arching portion and the side wall, and the stability of the overall structure is improved, if the spacing L is less than 1mm, the support and stress dispersion effect of the arching portion on the side wall may not be obvious, and the effect of preventing the concave of the side wall cannot be fully played; and if the spacing L is greater than 30mm, the stress is not evenly dispersed, a large stress difference is formed between the arching portion and the side wall, which is not conducive to the stability of the structure; the cross section of the arching portion is in the shape of "U", which helps to improve the bending resistance of the arching portion, and effectively prevents the concave deformation of the side wall. In the thickness direction of the shell body 1, when the height h of the arching portion is in the range of 0.3mm to 10mm, the rigidity of the side wall can be effectively improved, and the stress can be better dispersed.

[0020] Furthermore, when the ratio M of the arch length *a* to the sidewall width *B* is between 0.6 and 0.96, it facilitates stress dispersion at the open end of the sidewall. When the arch length *a* is between 1 mm and 30 mm, it plays a significant role in stress dispersion. If the length is less than 1 mm, the arch's protection range for the sidewall is limited, making it difficult to fully disperse stress, leading to localized stress concentration in the shell body under stress and increasing the risk of inward concavity at the open end. When the maximum length does not exceed 30 mm, sufficient stress dispersion is ensured without structural redundancy due to excessive length, and it provides stable and reliable support for the battery casing. When the ratio N of the arch width *b* to the sidewall length *A* is between 0.02 and 0.40, optimized stress distribution on the sidewall is achieved. Symmetrical arrangement of two arches provides the best solution to the inward concavity problem and enhances the overall structural stability of the shell body.

[0021] In addition, another objective of this invention is to provide a battery, including the battery casing as described above.

[0022] The battery described in this utility model, by setting the battery casing as described above, helps to improve the battery processing efficiency and yield.

[0023] In addition, this utility model also proposes an electrical device, including the battery described above.

[0024] The electrical device described in this utility model improves its performance by incorporating the aforementioned battery. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0026] Figure 1 This is a schematic diagram of the battery casing described in Embodiment 1 of this utility model from a first-view perspective;

[0027] Figure 2 This is a schematic diagram of the structure of a portion of the battery casing described in Embodiment 1 of this utility model from a second perspective;

[0028] Figure 3 for Figure 2 The sectional view along the CC direction in the middle;

[0029] Figure 4 This is a schematic diagram of the battery casing described in Embodiment 1 of this utility model from a third-person perspective.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Shell body;

[0032] 100, cavity; 101, side wall; 102, connecting wall; 103, arch; 1031, upper wall; 1032, outer wall; 1033, lower wall. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the description of the present application, it should be noted that if the terms indicating the orientation or position relationship such as "upper", "lower", "inner", "back" appear, they are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the present application. The device or element indicated or implied must have a specific orientation, a specific orientation and operation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0035] The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0036] Embodiment one

[0037] The present embodiment relates to a battery shell to solve the problem that the side wall 101 with an open end of the battery shell is prone to be concave in the prior art by optimizing the structure of the battery shell.

[0038] In terms of overall structure, the battery shell of the present embodiment includes a shell body 1 having a cavity 100 inside, and at least one end of the cavity 100 is provided with an opening. The shell body 1 includes two side walls 101 arranged opposite along the thickness direction thereof, and at least one side wall 101 is provided with an arch 103 adjacent to the opening, and the arch 103 arches outward relative to the side wall 101.

[0039] The battery shell described in the present embodiment can disperse the stress near the opening of the side wall 101 by providing the arch 103 adjacent to the opening on the side wall 101, the arching direction of the arch 103 is opposite to the direction of the concave end of the opening of the side wall 101, which can avoid stress concentration at the edge of the opening, thereby reducing the concave phenomenon of the side wall 101 caused by stress concentration. The design of the arch 103 also helps to improve the structural strength of the side wall 101, making the side wall 101 more stable, effectively preventing the weakening of the structure caused by the opening, providing a stable basic structure for the shell of the pole group, and then facilitating the installation of the pole group into the battery shell, thereby facilitating the improvement of the processing efficiency and the improvement of the yield.

[0040] Based on the above overall introduction, an exemplary structure of the battery shell described in the present embodiment is as follows Figure 1 andFigure 4 The width direction of the shell body 1 is specifically the x direction in the figure, the length direction of the shell body 1 is specifically the y direction in the figure, and the thickness direction of the shell body 1 is specifically the z direction in the figure. Figure 1 The width direction of the shell body 1 is specifically the x direction in the figure, the length direction of the shell body 1 is specifically the y direction in the figure, and the thickness direction of the shell body 1 is specifically the z direction in the figure. Figure 1 The width direction of the shell body 1 is specifically the x direction in the figure, the length direction of the shell body 1 is specifically the y direction in the figure, and the thickness direction of the shell body 1 is specifically the z direction in the figure. Figure 1 The width direction of the shell body 1 is specifically the x direction in the figure, the length direction of the shell body 1 is specifically the y direction in the figure, and the thickness direction of the shell body 1 is specifically the z direction in the figure.

[0041] The battery shell in the embodiment can be an aluminum shell or a steel shell, for example. Due to the material stress or production process defects, the open end of the shell body 1 is slightly concave, and the pole group enters the shell from the open end, thereby affecting the entering effect of the pole group. The shell body 1 in the embodiment can have an opening at one end, or both ends. The number of openings can be determined according to product requirements during specific implementation. As shown in Figure 1 The shell body 1 also has a connecting wall 102 connected between the same side of the two side walls 101. Obviously, the area of the connecting wall 102 is smaller than that of the side wall 101, so the concave problem is usually formed at the end of the side wall 101.

[0042] As a preferred embodiment, as shown in Figure 2 and Figure 3 The cross section of the arch part 103 is in the shape of "U". The cross section of the arch part 103 in the shape of "U" has high structural stability and strength. Compared with other shapes, the "U" shape can better withstand external pressure and internal stress, and evenly disperse the force to the surrounding part, thereby effectively preventing the side wall 101 from being deformed due to external force or internal stress, improving the overall structural performance of the battery shell. The cross section of the "U" shape can disperse the stress along the curved shape.

[0043] Specifically, referring to Figure 3 Due to the cross section of the arch part 103 in the shape of "U", it has an outer wall 1032 located on the outer side, an upper wall 1031 arranged near the end of the side wall 101, and a lower wall 1033 arranged opposite to the upper wall 1031. The arch part 103 has a groove body in communication with the cavity 100. When the shell body 1 is subjected to external force or internal stress, the "U" shaped structure can conduct the stress from the opening to the periphery, avoiding stress concentration in a certain point or area, thereby further enhancing the ability of the side wall 101 to resist deformation, and thereby facilitating the protection of the structural integrity of the battery shell. In addition, the cross section of the "U" shape also has the advantage of easy molding. Whether through stamping, die casting or other molding processes, the "U" shaped structure has good process feasibility, can reduce the production difficulty, and is conducive to improving the production efficiency and the consistency of the product.

[0044] As a preferred embodiment, as shown in Figure 1 and Figure 2As shown in FIG. 1, in the width direction of the side wall 101, the arch 103 is in a strip shape extending from the middle of the side wall 101 to both sides. Here, the width direction of the side wall 101 is specifically the x direction. The strip-shaped arch 103 extends from the middle of the side wall 101 to both sides, which can more evenly disperse the stress near the opening. Compared with other shapes or distribution methods, this strip-shaped structure can gradually conduct and disperse the stress along the length direction of the arch 103, avoiding stress concentration in certain specific areas, and further improving the ability of the side wall 101 to resist inward deformation. Further, the strip-shaped arch 103 is conducive to increasing the structural complexity and integrity of the side wall 101.

[0045] In addition, a continuous reinforcing structure can also be formed on the side wall 101 to support and reinforce the side wall 101 from the middle to both sides, making the structure of the entire side wall 101 more stable and reducing the possibility of overall structural instability caused by local deformation. In addition, the length direction of the arch 103 is parallel to the width direction of the shell body 1 (i.e., the x direction), and the width direction of the arch 103 is parallel to the length direction of the shell body 1 (i.e., the y direction).

[0046] As a preferred embodiment, referring to Figure 2 As shown in FIG. 1, in the length direction of the shell body 1 (i.e., in the y direction), the spacing L between the arch 103 and the corresponding end of the side wall 101 satisfies: 1 mm≤L≤30 mm. Here, the spacing L specifically refers to the spacing between the upper wall 1031 and the edge of the side wall 101 having one end of the arch 103. This spacing L range can ensure that the arch 103 effectively disperses the stress near the opening of the side wall 101. If the spacing L is less than 1 mm, the support and stress dispersion effect of the arch 103 on the side wall 101 may not be obvious, and the effect of preventing the side wall 101 from inward deformation cannot be fully played; and if the spacing L is greater than 30 mm, it will lead to uneven stress dispersion, forming a larger stress difference between the arch 103 and the side wall 101, which is not conducive to the stability of the structure.

[0047] In this embodiment, the spacing L is between 1 mm and 30 mm, which can make the stress more evenly distributed on the arch 103 and the side wall 101, and is conducive to enhancing the stability of the overall structure. Specifically, the spacing L may, for example, be 1 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, 18 mm, 20 mm, 22 mm, 25 mm, 28 mm, or 30 mm, etc.

[0048] As a preferred embodiment, as Figure 4As shown in Figs. 1 and 2, the height h of the arch 103 satisfies: 0.3mm≤h≤10mm in the thickness direction (i.e. z direction) of the shell body 1. When the height h of the arch 103 is in the range of 0.3mm to 10mm, the rigidity of the side wall 101 can be effectively enhanced, which is conducive to better dispersing the stress near the opening of the side wall 101 and enabling the arch 103 to provide effective support for the side wall 101 of the battery shell.

[0049] When the height h is greater than or equal to 0.3mm, the arch 103 has sufficient height to enhance the rigidity of the side wall 101 and is not prone to deformation, thereby improving the overall structural strength of the battery shell. When the height h is less than or equal to 10mm, sufficient support force can be provided without causing material waste due to excessive height. In a specific implementation, the height h may, for example, be 0.3mm, 0.5mm, 1mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc.

[0050] As a preferred embodiment, in combination with Figure 1 and Figure 2 As shown in Figs. 1 and 2, the ratio M between the length a of the arch 103 and the width B of the side wall 101 satisfies: 0.6≤M≤0.96. When the ratio M between the length a of the arch 103 and the width B of the side wall 101 is in the range of 0.6 to 0.96, the arch 103 can cover the area near the opening of the side wall 101 to a greater extent, thereby more effectively dispersing the stress in this area. If the length a of the arch 103 is too short, i.e. the ratio M is less than 0.6mm, the stress dispersing effect of the arch 103 on the side wall 101 is limited and the side wall 101 cannot be fully protected from stress concentration caused by the opening. If the ratio M is greater than 0.96, the stress will be dispersed excessively and new stress concentration points will be formed at both ends of the arch 103.

[0051] Furthermore, as a reinforcing structure of the side wall 101, the arch 103 has a reasonable ratio of the length a to the width B of the side wall 101, which enables the two to form a stable overall structure, is conducive to resisting the inward deformation of the side wall 101, effectively prevents the inward deformation of the side wall 101, provides reliable structural support for the battery shell, and ensures the safety and reliability of the battery during use.

[0052] As a preferred embodiment, the length a of the arch 103 satisfies: 1mm≤a≤30mm. When the length a of the arch 103 is between 1mm and 30mm, it can play a significant role in stress dispersion. If the length a is less than 1mm, the protection range of the arch 103 to the side wall 101 is limited, and it is difficult to fully disperse the stress, which leads to the local stress concentration of the shell body 1 when stressed, increasing the risk of opening concave. When the upper limit of the length a does not exceed 30mm, it can not only ensure sufficient stress dispersion effect, but also will not cause structural redundancy due to excessive length, and is beneficial to provide stable and reliable support for the battery shell. In specific implementation, the length a may be, for example, 1mm, 5mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 22mm, 25mm, 28mm or 30mm, etc.

[0053] As a preferred embodiment, the ratio N of the width b of the arch 103 to the length A of the side wall 101 satisfies: 0.02≤N≤0.40. When the ratio N of the width b of the arch 103 to the length A of the side wall 101 is between 0.02 and 0.40, it can achieve the optimal distribution of the stress of the side wall 101 and provide just the right support for the side wall 101. So that the arch 103 has enough width to share the pressure of the side wall 101, enhances the ability of the side wall 101 to resist deformation, thereby improving the overall stability of the battery shell. And the arch 103 will not cause waste of materials due to excessive width. In specific implementation, the ratio N may be, for example, 0.02, 0.05, 0.1, 0.2, 0.3, 0.4 or 0.5, etc.

[0054] Further, as shown in Figure 3 In the embodiment, the arch 103 is provided on both side walls 101, and the two arches 103 are symmetrically arranged. It is best for solving the concave problem, and is beneficial to enhance the overall structural stability of the shell body 1. The symmetrically arranged arch 103 can provide balanced support force for the two side walls 101, making the stress of the battery shell more uniform in all directions. Whether in the assembly link of the battery production process or in the use process under external pressure or internal stress change, the two symmetric arches 103 can work together to effectively resist the deformation of the side wall 101, maintain the overall structural stability of the battery shell, and reduce the risk of local deformation or damage caused by structural asymmetry.

[0055] The two arches 103 are symmetrically arranged to help evenly disperse the stress near the opening of the side wall 101 to the entire battery case structure. Due to the symmetric arrangement of the arches 103, the stress can be transmitted and diffused between the two side walls 101 in a symmetric manner, which helps to avoid stress concentration on a certain side wall 101 or a certain local area, thereby improving the safety and reliability of the battery. It can be understood that even if the two arches 103 are arranged asymmetrically, or only one side wall 101 of the arches 103 is arranged, the scheme is feasible.

[0056] The battery case of the embodiment helps to improve the solving effect of the side wall 101 concave problem by arranging the arches 103 on the side wall 101 in the opposite direction to the concave direction, and optimizing the length and width of the arches 103, and the range of the spacing L between the arches 103 and the same end of the side wall 101 and other parameters, so that the battery case is not prone to the concave problem at the opening, thereby facilitating the entry of the pole group into the case, and the structure of the entire battery case is simple and easy to arrange and implement.

[0057] Embodiment two

[0058] The embodiment relates to a battery comprising the battery case in the embodiment one.

[0059] The battery described in the embodiment helps to improve the processing efficiency and qualified rate of the battery by arranging the battery case as above, so that the pole group is arranged into the battery case.

[0060] Embodiment three

[0061] The embodiment relates to an electric device comprising the battery as described above.

[0062] The electric device described in the embodiment helps to improve the use performance by arranging the battery as above.

[0063] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A battery casing, characterized in that: Includes a shell body (1) having an internal cavity (100), at least one end of the cavity (100) being open; The shell body (1) includes two sidewalls (101) arranged opposite each other along its own thickness direction. At least one of the sidewalls (101) is provided with an arched portion (103) adjacent to the opening, and the arched portion (103) arches outward relative to the sidewall (101).

2. The battery casing according to claim 1, characterized in that: Along the length of the shell body (1), the distance L between the arched portion (103) and the corresponding end of the sidewall (101) satisfies: 1mm ≤ L ≤ 30mm; and / or, The cross-section of the arched portion (103) is U-shaped.

3. The battery casing according to claim 1, characterized in that: In the thickness direction of the shell body (1), the height h of the arched part (103) satisfies: 0.3mm≤h≤10mm.

4. The battery casing according to claim 1, characterized in that: In the width direction of the sidewall (101), the arched portion (103) is a long strip extending from the middle of the sidewall (101) to both sides.

5. The battery casing according to claim 4, characterized in that: The ratio M between the length a of the arched portion (103) and the width B of the sidewall (101) satisfies: 0.6≤M≤0.96。 6. The battery casing according to claim 4, characterized in that: The length a of the arched portion (103) satisfies: 1mm≤a≤30mm.

7. The battery casing according to claim 4, characterized in that: The ratio N of the width b of the arch (103) to the length A of the sidewall (101) satisfies: 0.02≤N≤0.40。 8. The battery casing according to any one of claims 1 to 7, characterized in that: Both sidewalls (101) are provided with the arched portion (103), and the two arched portions (103) are arranged symmetrically.

9. A battery, characterized in that: The battery casing includes any one of claims 1 to 8.

10. An electrical device, characterized in that: Includes the battery as described in claim 9.

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