A lightweight and high-strength battery shell

Abstract

The present application relates to the technical field of battery shells, and discloses a lightweight and high-strength battery shell, including a main body and a cover body, the edge of the main body has a first flange, the edge of the cover body has a second flange, the first flange and the second flange are close to each other, and the end faces are abutted with a sealing ring, and the sealing ring is sealed and fixed to the first flange and the second flange by a fixing portion, and a sealing curtain is also enclosed between the first flange and the second flange, and the opposite sides of the sealing curtain are respectively sealed and connected to the first flange and the second flange, and a gap is left between the first flange and the second flange through the sealing ring, and the sealing curtain is folded and installed in the gap between the first flange and the second flange. The present application can keep the battery shell airtight.

Description

Technical Field

[0001] The present application relates to the technical field of battery casings, and in particular to a lightweight and high-strength battery casing. Background Art

[0002] Lightweight and strong battery shells will use carbon fiber composite materials in the selection of materials. Carbon fiber composite materials have excellent mechanical properties and impact resistance. Then, by optimizing the structural design, for example, the use of one-piece molding process can reduce welding, sealing and other processes. Therefore, a lightweight and strong battery shell can be obtained by stamping and casting carbon fiber composite materials.

[0003] The battery case includes a main body and a cover. After the battery is installed in the main body, the edges of the cover and the main body have integrally formed flanges, and the flanges are fixedly connected. Since the flanges are made of carbon fiber composite materials, welding will not be used, because welding has extremely high requirements for equipment and technology. Therefore, the fixed connection between the flanges is mainly fixed by bonding, bolting, etc.

[0004] If the battery swells after long-term use, the sealing of the battery case will be weakened locally. Insufficient sealing of the battery case may lead to serious consequences such as moisture or water ingress. Utility Model Content

[0005] In order to improve the sealing performance of a battery casing, the present application provides a lightweight and high-strength battery casing.

[0006] The present application provides a lightweight and high-strength battery casing, which adopts the following technical solutions:

[0007] A lightweight and high-strength battery shell comprises a main body and a cover body, wherein the edge of the main body has a first flange, and the edge of the cover body has a second flange, and a sealing ring is abutted on one end face of the first flange and the second flange that are close to each other, and the sealing ring is sealed and fixed to the first flange and the second flange through a fixing portion, and a sealing curtain is also enclosed between the first flange and the second flange, and the opposite sides of the sealing curtain are respectively sealed to the first flange and the second flange, and a gap is left between the first flange and the second flange through the sealing ring, and the sealing curtain is installed in a folded state at the gap between the first flange and the second flange.

[0008] By adopting the above technical scheme, the first flange and the second flange are not directly fixed, but are indirectly fixed together through the sealing ring and the fixing part, and a sealing curtain is added between the first flange and the second flange, so that there are two sealing effects between the main body and the cover body, the first sealing effect is improved by the sealing ring, and the second sealing effect is provided by the sealing curtain; if the sealing ring is fixedly installed between the first flange and the second flange, the sealing curtain is in a folded state, and if the battery bulges, it will lift up the cover body, and after the cover body is deformed, it will mainly separate from the main body, and the sealing ring may not continue to have a sealing effect, but the sealing curtain can be partially unfolded according to the separation of the cover body and the main body, and the gap between the main body and the cover body is blocked by the sealing curtain, and the main body and the cover body can still maintain sealing.

[0009] Optionally, the sealing cloth curtain is provided with two mounting rings, and the two mounting rings are respectively fixedly mounted on the first flange and the second flange.

[0010] By adopting the above technical solution, the sealing curtain has a relatively soft characteristic, and the sealing curtain is connected with the installation ring and the first flange or the second flange, thereby accelerating the installation speed of the sealing curtain.

[0011] Optionally, the fixing portion is a bolt, and the bolts are distributed along the circumference of the main body.

[0012] By adopting the above technical solution, after the first flange and the second flange are fixedly connected by bolts, the sealing ring is fixedly clamped by the first flange and the second flange.

[0013] Optionally, the sealing ring is located inside the sealing curtain.

[0014] By adopting the above technical solution, the sealing curtain is installed outside the sealing ring. When the sealing ring is installed, the sealing curtain is installed. If a gap appears between the cover body and the main body, the sealing ring clamped by the first flange and the second flange is still stably located in the sealing curtain.

[0015] Optionally, the mounting ring is provided with a plurality of mounting ears spaced apart from each other, the mounting ears of two mounting rings abut against each other to form a pair, and the bolts are correspondingly mounted on a pair of mounting ears.

[0016] By adopting the above technical solution, if a bulge occurs at a certain position of the battery and lifts up the cover body, and the mounting ears close to the bulge are deformed, because the mounting ears are distributed at intervals, other pairs of mounting ears can be fixedly connected to each other to reduce the degree of deformation of the overall body.

[0017] Optionally, the fixing portion is an adhesive layer, the adhesive layer is coated on both end surfaces of the sealing ring, and the first convex edge and the second convex edge are both connected to the adhesive layer.

[0018] By adopting the above technical solution, the sealing ring is directly fixedly connected to the first flange and the second flange through the adhesive layer.

[0019] Optionally, the sealing curtain is located inside the sealing ring.

[0020] By adopting the above technical solution, the sealing curtain is first installed on the first flange and the second flange. The first flange and the second flange can be fixedly connected because of the sealing curtain. However, because the sealing curtain is stacked between the first flange and the second flange at the back, the sealing curtain has a larger installation space for bonding the sealing ring after installation. The sealing curtain can also have a positioning effect on the installation position of the sealing ring.

[0021] Optionally, both the first flange and the second flange are provided with an annular groove for installing the mounting ring.

[0022] By adopting the above technical solution, the cooperation between the mounting ring and the ring groove can quickly determine the installation position of the sealing curtain, and the mounting ring can be fixedly bonded in the mounting groove.

[0023] In summary, the present application includes at least one of the following beneficial effects:

[0024] 1. The installation of sealing ring and sealing curtain makes the main body and cover have double sealing effect;

[0025] 2. If the battery bulges and causes a slight separation between the main body and the cover, the sealing curtain can also play a sealing role, thereby improving the overall sealing of the battery shell;

[0026] 2. The sealing ring is located inside the sealing curtain, but the sealing ring clamped by the first flange and the second flange is still stably located inside the sealing curtain;

[0027] 3. The sealing curtain is located inside the sealing ring. After the sealing curtain is installed, there is a large installation space for bonding the sealing ring. The sealing curtain can also position the installation position of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present application;

[0029] Figure 2 is a partial cross-sectional view of the first embodiment of the present application;

[0030] Figure 3 is a partial cross-sectional view of the second embodiment of the present application;

[0031] Figure 4 is a partial cross-sectional view of the third embodiment of the present application;

[0032] Figure 5 It is a schematic diagram of the overall structure of Example 3 of the present application.

[0033] Explanation of the reference numerals: 1. Main body; 2. Cover body; 3. First flange; 4. Second flange; 5. Sealing ring; 6. Sealing cloth curtain; 61. Mounting ring; 7. Ring groove; 8. Bolt; 9. Mounting ear. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-5 This application is described in further detail.

[0035] The embodiment of the present application discloses a lightweight and high-strength battery casing.

[0036] Embodiment 1:

[0037] Reference Figure 1 and Figure 2 A lightweight and high-strength battery shell includes a main body 1 and a cover body 2. The edge of the main body 1 is integrally formed with a first flange 3, and the edge of the cover body 2 is integrally formed with a second flange 4. The first flange 3 and the second flange 4 are close to each other and abutted with a sealing ring 5. The sealing ring 5 is fixedly connected to the first flange 3 and the second flange 4 through a fixing portion. Because a gap is left between the first flange 3 and the second flange 4, the sealing ring 5 provides the first sealing protection for the battery shell. A sealing curtain 6 is also enclosed between the first flange 3 and the second flange 4. The sealing curtain 6 is made of corrosion-resistant and relatively tough cloth. The opposite sides of the sealing curtain 6 are sealed and connected to the first flange 3 and the second flange 4 respectively. The sealing curtain 6 provides the second sealing effect for the battery shell. When the sealing ring 5 and the sealing curtain 6 are both installed between the first flange 3 and the second flange 4, the sealing curtain 6 is installed between the first flange 3 and the second flange 4 in a folded state.

[0038] Reference Figure 2 , mounting rings 61 are respectively installed on the two opposite sides of the sealing curtain 6, and the two mounting rings 61 are respectively connected to the first flange 3 and the second flange 4. The first flange 3 and the second flange 4 are both provided with an annular groove 7, and the mounting ring 61 is embedded in the annular groove 7 and then fixed in the annular groove 7 by means of a sealant. Because the sealing curtain 6 is relatively soft, the sealing curtain 6 can be quickly installed between the first flange 3 and the second flange 4 through the mounting ring 61.

[0039] Reference Figure 2 The fixing part can be a bolt 8, which is distributed along the circumference of the contour of the main body 1. The bolt 8 can pass through the first flange 3 and then be threadedly connected to the second flange 4. The bolt 8 can also pass through the first flange 3 and the second flange 4 and be threadedly connected to the nut. The bolt 8 fixes the first flange 3 and the second flange 4 together, and the sealing ring 5 is clamped and fixed by the first flange 3 and the second flange 4, and the sealing ring 5 can play a sealing effect.

[0040] The fixing part may also be an adhesive layer, which is coated on both end surfaces of the sealing ring 5 with glue, and the first flange 3 and the second flange 4 are both connected to the adhesive layer, so that the first flange 3 and the second flange 4 are indirectly fixedly connected together through the sealing ring 5.

[0041] Reference Figure 2 The sealing cloth curtain 6 is located inside the sealing ring 5. The first flange 3 and the second flange 4 can be fixedly connected because of the sealing cloth curtain 6. However, because the sealing cloth curtain 6 is stacked between the first flange 3 and the second flange 4, the sealing cloth curtain 6 has a larger installation space after installation to bond the sealing ring 5. The sealing cloth curtain 6 can also play a positioning effect on the installation position of the sealing ring 5.

[0042] The implementation principle of a lightweight and high-strength battery casing in the first embodiment of the present application is:

[0043] When the first flange 3 and the second flange 4 are fixedly connected, the sealing ring 5 and the sealing curtain 6 are both installed between the first flange 3 and the second flange 4, which can provide double sealing protection. If the battery bulges and causes the battery casing or the cover 2 to deform, the sealing property of the sealing ring 5 will generally be destroyed. However, the folded sealing curtain 6 can achieve a sealing effect, so that the battery can still be in a sealed environment.

[0044] Embodiment 2:

[0045] Reference Figure 3 The difference between the second embodiment and the first embodiment is that the sealing ring 5 is located inside the sealing curtain 6, and the other structures and principles are the same as those of the first embodiment. The sealing ring 5 is fixedly mounted on the first flange 3 and the second flange 4 through the adhesive layer. The sealing curtain 6 can protect the sealing ring 5. If the sealing performance of the sealing ring 5 is damaged, the sealing ring 5 will not fall off. The outer peripheral side of the mounting ring 61 can be flush with the first flange and the second flange.

[0046] Embodiment three:

[0047] Reference Figure 4 and Figure 5 , the difference between the third embodiment and the second embodiment is that the fixing part adopts a bolt 8, and the bolt 8 is installed on the mounting ring 61. The other structures and principles are the same as those of the first embodiment. The mounting ring 61 is provided with a plurality of mounting ears 9 at intervals, and the mounting ears 9 of the two mounting rings 61 correspond to each other. After the two mounting rings 61 are installed, the two mounting ears 9 abut against each other to form a pair, and the bolt 8 is correspondingly installed on the pair of mounting ears 9. The mounting ears 9 are partially located outside the first flange 3 and the second flange 4, and the bolt 8 passes through the portion of the mounting ears 9 outside the first flange 3 and is then threadedly connected with a nut, so that the operating space of the bolt 8 is larger when installing, and it can also be more secure.

[0048] If a bulge occurs at a certain position of the battery and lifts up the cover body 2, and the mounting ears 9 near the bulge are deformed, because the mounting ears 9 are distributed at intervals, other pairs of mounting ears 9 can be fixedly connected to each other to reduce the deformation degree of the overall main body 1.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lightweight and high-strength battery casing, characterized in that: The invention comprises a main body (1) and a cover body (2), wherein the edge of the main body (1) has a first flange (3), and the edge of the cover body (2) has a second flange (4); a sealing ring (5) is abutted against one end surface of the first flange (3) and the second flange (4) which are close to each other; the sealing ring (5) is sealed and fixed to the first flange (3) and the second flange (4) through a fixing portion; a sealing curtain (6) is also enclosed between the first flange (3) and the second flange (4); two opposite sides of the sealing curtain (6) are respectively sealed and connected to the first flange (3) and the second flange (4); a gap is left between the first flange (3) and the second flange (4) through the sealing ring (5); and the sealing curtain (6) is installed in the gap between the first flange (3) and the second flange (4) in a folded state.

2. A lightweight and high-strength battery casing according to claim 1, characterized in that: Mounting rings (61) are respectively mounted on two opposite sides of the sealing cloth curtain (6).

3. A lightweight and high-strength battery casing according to claim 2, characterized in that: The fixing portion is a bolt (8), and the bolts (8) are distributed along the circumference of the main body (1).

4. A lightweight and high-strength battery casing according to claim 3, characterized in that: The sealing ring (5) is located inside the sealing cloth curtain (6).

5. A lightweight and high-strength battery casing according to claim 4, characterized in that: The mounting ring (61) is provided with a plurality of mounting ears (9) distributed at intervals, the mounting ears (9) of two mounting rings (61) abut against each other to form a pair, and the bolts (8) are correspondingly mounted on the pair of mounting ears (9).

6. A lightweight and high-strength battery casing according to claim 2, characterized in that: The fixing portion is an adhesive layer, which is coated on both end surfaces of the sealing ring (5), and the first flange (3) and the second flange (4) are both connected to the adhesive layer.

7. A lightweight and high-strength battery casing according to claim 6, characterized in that: The sealing cloth curtain (6) is located inside the sealing ring (5).

8. The lightweight and high-strength battery casing according to claim 2, characterized in that: The first convex edge (3) and the second convex edge (4) are both provided with an annular groove (7) for mounting the mounting ring (61).

Images