Anti-bulge positive electrode shell

Abstract

The utility model discloses an anti-bulge positive pole shell which comprises a positive pole ring and a positive pole cover, one end of the positive pole ring is connected with one end face of the positive pole cover, the positive pole cover is sequentially provided with a first blank area, a punching area and a second blank area from inside to outside in the radial direction, the positive pole ring surrounds the peripheral edge of the second blank area, and the punching area is arranged in the first blank area. The first blank area is arranged in the middle of the positive electrode cover, and a plurality of uniformly distributed through holes are formed in the punching area. According to the utility model, the first blank area, the punching area and the second blank area are arranged, so that the pressure in the battery is mutually counteracted, the stress of the positive electrode material is balanced, the anti-bulge capability of the positive electrode shell is improved, the bulge deformation is avoided, and the outward expansion of the positive electrode ring can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of button batteries, and particularly relates to a positive electrode case for preventing bulging. Background Art

[0002] With the rapid development of portable electronic devices and electric vehicles, button batteries, as the main energy storage devices, have received extensive attention in terms of their performance and safety. In the structure of button batteries, the positive electrode case plays a crucial role. It not only protects the internal positive electrode material but also bears the internal pressure generated during the charging and discharging process of the battery.

[0003] However, the positive electrode cases in the prior art are prone to bulging during long-term charge and discharge cycles. This phenomenon is usually caused by factors such as an increase in internal pressure of the battery, an increase in temperature, or material aging. Bulging not only affects the appearance of the battery but, more importantly, reduces the performance of the battery and increases safety risks such as short circuits and thermal runaway.

[0004] Currently, some solutions on the market include using higher-strength materials or increasing the thickness of the case to improve the anti-bulging ability. These methods often increase the weight and cost of the battery and, to a certain extent, limit the energy density of the battery. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to overcome the problems existing in the prior art and provide a positive electrode case for preventing bulging. By setting a first blank area, a punching area, and a second blank area, the internal pressure of the battery is mutually offset, and the positive electrode material is under balanced stress, which not only improves the anti-bulging ability of the positive electrode case, prevents bulging and deformation, but also avoids the outward expansion of the positive electrode ring.

[0006] To achieve the above technical purpose and reach the above technical effect, the utility model is realized through the following technical solutions:

[0007] A positive electrode case for preventing bulging, comprising a positive electrode ring and a positive electrode cover. One end of the positive electrode ring is connected to one end face of the positive electrode cover. The positive electrode cover is sequentially provided with a first blank area, a punching area, and a second blank area from the inside to the outside in the radial direction. The positive electrode ring surrounds the outer peripheral edge of the second blank area. The first blank area is arranged in the middle of the positive electrode cover, and the punching area is provided with a plurality of uniformly distributed through holes.

[0008] Furthermore, a plurality of the through holes surround the first blank area, and the second blank area surrounds the punching area.

[0009] Furthermore, the area of the punching area is 55% - 65% of the area of the positive electrode cover.

[0010] Further, the area of the first blank area is 15% - 30% of the area of the positive electrode cover, and the area of the second blank area is 15% - 30% of the area of the positive electrode cover.

[0011] Further, the through hole is set as a rectangular hole or a circular hole.

[0012] Further, the positive electrode ring is in an annular structure, and the positive electrode cover is in a disc-shaped structure.

[0013] Further, the outer diameter of the positive electrode ring is the same as the diameter of the positive electrode cover.

[0014] Further, the positive electrode ring and the positive electrode cover are integrally formed.

[0015] Further, the materials of the positive electrode ring and the positive electrode cover are both one of stainless steel, stainless iron or aluminum.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] By providing the first blank area, the punching area and the second blank area, the pressure inside the battery cancels each other out, enabling the positive electrode material to be under balanced stress, and preventing the positive electrode shell from bulging and deforming. This not only improves the anti-bulging ability of the positive electrode shell with a bulging rate < 10%, but also avoids the outward expansion of the positive electrode ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side view of the positive electrode shell in the present utility model;

[0019] Figure 2 is a top view of the positive electrode ring in the present utility model;

[0020] Figure 3 is a top view of the positive electrode cover in Embodiment 1;

[0021] Figure 4 is a top view of the positive electrode shell in Embodiment 1;

[0022] Figure 5 is a top view of the positive electrode cover in Embodiment 2;

[0023] Figure 6 is a top view of the positive electrode shell in Embodiment 2.

[0024] The reference numerals are: 1 - positive electrode ring, 2 - positive electrode cover, 21 - first blank area, 22 - second blank area, 23 - through hole, and 3 - positive electrode shell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] For the convenience of understanding by those skilled in the art, the present utility model will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the embodiments does not limit the present utility model.

[0026] Example 1

[0027] like Figure 1-4 As shown, this embodiment discloses an anti-bulging positive electrode shell 3, including a positive electrode ring 1 and a positive electrode cover 2, one end of the positive electrode ring 1 is connected to one end face of the positive electrode cover 2, the positive electrode ring 1 is provided with a first blank area 21, a punching area and a second blank area 22 in sequence from the inside to the outside in the radial direction, the positive electrode cover 2 surrounds the outer peripheral edge of the second blank area 22, the first blank area 21 is provided in the middle of the positive electrode cover 2, and the punching area is provided with a plurality of evenly distributed through holes 23. By providing the first blank area 21, the punching area and the second blank area 22, the pressure inside the battery offsets each other, so that the positive electrode material is balanced in force, and the positive electrode shell 3 will not be bulged and deformed, which not only improves the anti-bulging ability of the positive electrode shell 3, but also prevents the positive electrode ring 1 from expanding outward.

[0028] In this embodiment, a through hole group consisting of a plurality of through holes 23 surrounds the first blank area 21 , and the second blank area 22 surrounds the punching area.

[0029] Furthermore, the area of ​​the punching area is 55% to 65% of the area of ​​the positive electrode cover. In this embodiment, the area of ​​the punching area is preferably 60% of the area of ​​the positive electrode cover 2.

[0030] Furthermore, the area of ​​the first blank area is 15% to 30% of the area of ​​the positive electrode cover, and the area of ​​the second blank area is 15% to 30% of the area of ​​the positive electrode cover. In this embodiment, the area of ​​the first blank area 21 is 15% of the area of ​​the positive electrode cover 2, and the area of ​​the second blank area 22 is 25% of the area of ​​the positive electrode cover 2.

[0031] In this embodiment, the through hole 23 is configured as a rectangular hole.

[0032] In this embodiment, the positive electrode ring 1 is a circular ring structure, and the positive electrode cover 2 is a disc-shaped structure.

[0033] In this embodiment, the outer diameter of the positive electrode ring 1 is the same as the diameter of the positive electrode cap 2. Through the above arrangement, the positive electrode ring 1 can surround the outer peripheral edge of the second blank area 22, thereby limiting the outward expansion of the positive electrode material.

[0034] In this embodiment, the positive electrode ring 1 and the positive electrode cover 2 are punched into an integrally formed positive electrode shell 3 by a punching machine.

[0035] In this embodiment, the positive electrode ring 1 and the positive electrode cover 2 are both made of stainless steel.

[0036] Example 2

[0037] likeFigure 1-2 As shown in Figures 5 - 6, this embodiment discloses a bulging - proof positive electrode case 3, which includes a positive electrode ring 1 and a positive electrode cover 2. One end of the positive electrode ring 1 is connected to one end face of the positive electrode cover 2. The positive electrode cover 2 is provided with a first blank area 21, a punching area, and a second blank area 22 in sequence from the inside to the outside in the radial direction. The positive electrode ring 1 surrounds the outer peripheral edge of the second blank area 22. The first blank area 21 is arranged in the middle of the positive electrode cover 2, and the punching area is provided with a plurality of uniformly distributed through - holes 23. By setting the first blank area 21, the punching area, and the second blank area 22, the pressures inside the battery cancel each other out, enabling the positive electrode material to be under balanced stress, and the positive electrode case 3 will not bulge or deform. This not only improves the anti - bulging ability of the positive electrode case 3 but also avoids the outward expansion of the positive electrode ring 1.

[0038] In this embodiment, a through - hole group composed of a plurality of the through - holes 23 surrounds the four sides of the first blank area 21, and the second blank area 22 surrounds the punching area.

[0039] Further, the area of the punching area is 55% - 65% of the area of the positive electrode cover. In this embodiment, the area of the punching area is preferably 55% of the area of the positive electrode cover 2.

[0040] Further, the area of the first blank area is 15% - 30% of the area of the positive electrode cover, and the area of the second blank area is 15% - 30% of the area of the positive electrode cover. In this embodiment, the area of the first blank area 21 is 20% of the area of the positive electrode cover 2, and the area of the second blank area 22 is 25% of the area of the positive electrode cover 2.

[0041] In this embodiment, the through - hole 23 is set as a circular hole.

[0042] In this embodiment, the positive electrode ring 1 is a circular - ring structure, and the positive electrode cover 2 is a circular - sheet structure.

[0043] In this embodiment, the outer diameter of the positive electrode ring 1 is the same as the diameter of the positive electrode cover 2. Through the above - mentioned setting, the positive electrode ring 1 can surround the outer peripheral edge of the second blank area 22, playing a role in restricting the outward expansion of the positive electrode material.

[0044] In this embodiment, the positive electrode ring 1 and the positive electrode cover 2 are formed into an integral positive electrode case 3 by stamping with a stamping machine.

[0045] In this embodiment, the materials of both the positive electrode ring 1 and the positive electrode cover 2 are stainless steel.

[0046] The above has introduced in detail the technical solutions provided by the embodiments of the present utility model. Specific examples are used herein to elaborate on the principles and implementation manners of the embodiments of the present utility model. The descriptions of the above embodiments are only applicable to helping understand the principles of the embodiments of the present utility model. At the same time, for those of ordinary skill in the art, according to the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. An anti-bulging positive electrode case, characterized in that: It includes a positive electrode ring and a positive electrode cover. One end of the positive electrode ring is connected to one end face of the positive electrode cover. The positive electrode cover is provided with a first blank area, a punching area, and a second blank area in sequence from inside to outside in the radial direction. The positive electrode ring surrounds the outer peripheral edge of the second blank area. The first blank area is arranged in the middle of the positive electrode cover, and the punching area is provided with a plurality of uniformly distributed through holes.

2. The anti-bulging positive electrode case according to claim 1, wherein: A plurality of the through holes surround the first blank area, and the second blank area surrounds the punching area.

3. The anti-bulging positive electrode case according to claim 1, wherein: The area of the punching area is 55% - 65% of the area of the positive electrode cover.

4. The anti-bulging positive electrode case according to claim 1, characterized in that: The area of the first blank area is 15% - 30% of the area of the positive electrode cover, and the area of the second blank area is 15% - 30% of the area of the positive electrode cover.

5. The anti-bulging positive electrode case according to claim 1, characterized in that: The through holes are set as rectangular holes or circular holes.

6. The anti-bulging positive electrode case according to claim 1, wherein: The positive electrode ring is a circular ring structure, and the positive electrode cover is a circular sheet structure.

7. The anti-bulging positive electrode case according to claim 1, characterized in that: The outer diameter of the positive electrode ring is the same as the diameter of the positive electrode cover.

8. The anti-bulging positive electrode case according to claim 1, characterized in that: The positive electrode ring and the positive electrode cover are integrally formed.

9. The anti-bulging positive electrode case according to claim 1, characterized in that: The materials of the positive electrode ring and the positive electrode cover are both one of stainless steel, stainless iron, or aluminum.

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