Battery top cover structure

Abstract

The utility model discloses a battery top cover structure, which relates to the technical field of batteries and comprises a base plate and a pole, a sealing ring is arranged at the top of the base plate and connected with the pole, and a pressing ring for pressing the sealing ring is sleeved at the top of the base plate. And an injection molding surface layer for fixing the pressing ring and the pole is sleeved on the outer side of the pole. The battery top cover is simple in structure and reasonable in layout, and can effectively avoid the airtight problem caused by heating of the pole, thereby being beneficial to improving the charging and discharging capability of the battery.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery top cover structure. Background Art

[0002] The electric vehicle, energy storage industry, electric tool and other industries are developing rapidly nowadays. The power battery is an important component in related industries, which has a direct impact on the performance of corresponding products. Nowadays, the demand for power batteries is increasing day by day.

[0003] The power battery has various structures such as lead-acid batteries and lithium-ion batteries. It usually includes a housing, a battery cell and a top cover. The battery cell is located inside the housing and is encapsulated by the top cover. The top cover includes a top cover plate and a pole column arranged on the top cover plate. The pole column is used to connect the battery cell with an external electrical device. The top cover plate and the pole column are usually made of metal materials to ensure the structural strength. Therefore, insulation needs to be achieved between the top cover plate and the pole column, and sealing is also required between the top cover plate and the pole column to prevent leakage.

[0004] However, in the prior art, due to reasons such as welding of the battery cell and the pole column, battery pack, and overcurrent heat generation of the battery, the pole column will be heated, resulting in problems of poor airtightness of the product. Summary of the Utility Model

[0005] The technical problem solved by this solution is:

[0006] How to solve the problem that the product is prone to poor airtightness due to the heating of the pole column.

[0007] The purpose of the utility model can be achieved by the following technical solutions: A battery top cover structure includes a substrate and a pole column. A sealing ring is arranged on the top of the substrate. The sealing ring is connected to the pole column. A pressing ring for pressing the sealing ring is sleeved on the top of the substrate. An injection-molded surface layer for fixing the pressing ring and the pole column is sleeved on the outside of the pole column.

[0008] Preferably, the inner wall of the sealing ring is sleeved on the pole column.

[0009] Preferably, a support layer is arranged at the edge of the pressing ring and the pole column.

[0010] Preferably, the support layer is made of ceramic material or hard plastic.

[0011] Preferably, the support layer and the injection-molded surface layer are of an integral structure.

[0012] Preferably, the cross-section of the sealing ring is in an L-shaped structure, and the L-shaped structure is used to support the pole column.

[0013] Preferably, a stop portion extends downward from the lower end of the L-shaped structure, and the stop portion fits against the inside of the substrate.

[0014] Preferably, a chamfer or a fillet is provided on the outer side of the upper end of the L-shaped structure.

[0015] Preferably, a notch is provided at the lower end of the outer side of the terminal post.

[0016] Preferably, the cross section of the pressing ring is in a Z-shaped structure.

[0017] Preferably, the upper part of the Z-shaped structure is pressed against the upper end of the sealing ring and the support layer.

[0018] Preferably, the injection-molded surface layer is adapted to be filled between the pressing ring and the terminal post.

[0019] Preferably, a groove for filling the injection-molded surface layer is formed on the outer side of the terminal post.

[0020] Preferably, the part of the cross section of the injection-molded surface layer corresponding to the Z-shaped structure is in a Z-shaped structure.

[0021] Preferably, a step groove for embedding the bottom of the pressing ring and the bottom of the injection-molded surface layer is provided on the substrate.

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] When the present utility model is in use, by arranging a support layer between the edges of the pressing ring and the terminal post, due to the excellent heat resistance of the support layer, the airtightness problem caused by the aging of the sealing ring due to the thermal influence of the battery is avoided, and at the same time, it is suitable for large-current charging and discharging of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] For the convenience of understanding by those skilled in the art, the present utility model will be further described below with reference to the accompanying drawings.

[0025] Figure 1 is a schematic structural diagram of the battery top cover structure in the present utility model;

[0026] Figure 2 is the present utility model Figure 1 the enlarged view of the structure at A;

[0027] In the figure: 1, terminal post; 2, substrate; 3, sealing ring; 4, pressing ring; 5, support layer; 6, injection-molded surface layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Example 1

[0030] A battery top cover structure includes a substrate 2 and a pole column 1. A sealing ring 3 is arranged on the top of the substrate 2. The sealing ring 3 is connected to the pole column 1. A pressing ring 4 for pressing the sealing ring 3 is sleeved on the top of the substrate 2. An injection-molded surface layer 6 for fixing the pressing ring 4 and the pole column 1 is sleeved on the outer side of the pole column 1.

[0031] Example 2

[0032] Please refer to Figures 1 to 2 As shown, the difference from Example 1 is that in this example, the inner wall of the sealing ring 3 is sleeved on the pole column 1.

[0033] It should be understood that the specific structure of the sealing ring 3 is not limited in this example. The following only provides one structure for reference: The cross-section of the sealing ring 3 is in an L-shaped structure, and the L-shaped structure is used to support the pole column 1. The sealing ring 3 with the L-shaped structure can not only wrap the pole column 1 but also support the pole column 1.

[0034] In this example, preferably, a stop portion extends downward from the lower end of the L-shaped structure, and the stop portion fits against the inner side of the substrate 2. The stop portion can realize the limit between the sealing ring 3 and the substrate 2, and at the same time improve the sealing performance.

[0035] In this example, more preferably, a chamfer or a fillet is provided on the outer side of the upper end of the L-shaped structure. On the one hand, the chamfer or the fillet facilitates assembly. On the other hand, it can reduce the stress concentration phenomenon between the sealing ring 3 and the pressing ring 4 and prevent the upper end of the sealing ring 3 from deflecting towards the pole column 1 due to pressure.

[0036] Example 3

[0037] Please refer to Figures 1 to 2 As shown, the difference from Example 1 or Example 2 is that in this example, a support layer 5 is provided at the edge of the pressing ring 4 and the pole column 1. By providing the support layer 5 and making the support layer 5 have excellent heat resistance, it can avoid the airtight problem caused by the aging of the sealing ring 3 due to the thermal influence of the battery, and at the same time is suitable for large-current charging and discharging of the battery.

[0038] It should be understood that the specific formation method of the support layer 5 is not limited in this example. The following only provides two methods for reference:

[0039] The first one: The support layer 5 is made of a heat-resistant material such as ceramic material or hard plastic. An independent support layer 5 structure is made of the heat-resistant material and is installed between the sealing ring 3 and the pole column 1 through an assembly method, so as to play a heat insulation role and thus solve the airtight problem caused by aging.

[0040] Second, the support layer 5 and the injection-molded surface layer 6 are of an integral structure. After assembly, an injection cavity is reserved at the positions corresponding to the support layer 5 and the injection-molded surface layer 6 on the battery top cover structure, and the rubber material is injected into the injection cavity by an injection method. After cooling, the support layer 5 and the injection-molded surface layer 6 can be integrally formed.

[0041] Embodiment 4

[0042] Please refer to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 or Embodiment 2 or Embodiment 3 is that a notch is provided at the lower outer side of the terminal post 1. The notch facilitates reducing the extrusion effect of the lower outer side of the terminal post 1 on the sealing ring 3, thereby preventing the sealing ring 3 from being damaged.

[0043] Embodiment 5

[0044] Please refer to Figures 1 to 2 As shown, the difference between this embodiment and Embodiment 1 or Embodiment 2 or Embodiment 3 or Embodiment 4 is that the cross section of the pressing ring 4 is in a Z-shaped structure. The pressing ring with this shape not only facilitates the substrate 2 to play a better supporting role for it, but also can play a better pressing role on the sealing ring 3.

[0045] In this embodiment, the upper part of the Z-shaped structure is pressed against the upper end of the sealing ring 3 and the support layer 5, so that the pressing ring simultaneously exerts a pressing force on the support layer 5.

[0046] Embodiment 6

[0047] Please refer to Figures 1 to 2 As shown, in this embodiment, an injection-molded surface layer 6 is suitable for being filled between the pressing ring 4 and the terminal post 1. On the one hand, it can improve the adhesion ability of the injection-molded surface layer 6, and on the other hand, it can further play a heat insulation role for the terminal post 1.

[0048] In this embodiment, a groove for filling the injection-molded surface layer 6 is formed on the outer side of the terminal post 1, further improving the adhesion ability of the injection-molded surface layer 6.

[0049] In this embodiment, the part of the cross section of the injection-molded surface layer 6 corresponding to the Z-shaped structure is a Z-shaped structure, further improving the adhesion ability of the injection-molded surface layer 6.

[0050] In this embodiment, a step groove for embedding the bottom of the pressing ring 4 and the bottom of the injection-molded surface layer 6 is provided on the substrate 2, improving the compactness and rationality of the cooperation between the structures and optimizing the structural layout.

[0051] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the present utility model by using the above-disclosed technical content. However, as long as it does not depart from the content of the technical solution of the present utility model, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A battery top cover structure, comprising a substrate (2) and a pole column (1), characterized in that, A sealing ring (3) is provided on the top of the substrate (2). The sealing ring (3) is connected to the pole column (1). A pressure ring (4) for pressing the sealing ring (3) is sleeved on the top of the substrate (2). An injection-molded surface layer (6) for fixing the pressure ring (4) and the pole column (1) is sleeved on the outer side of the pole column (1).

2. The battery top cover structure according to claim 1, characterized in that, The inner wall of the sealing ring (3) is sleeved on the pole column (1).

3. A battery top cover structure according to claim 1 or 2, characterized in that, A support layer (5) is provided at the edge of the pressure ring (4) and the pole column (1).

4. The battery top cover structure according to claim 3, characterized in that, The support layer (5) is made of ceramic material or hard plastic.

5. The battery top cover structure according to claim 3, characterized in that The support layer (5) and the injection-molded surface layer (6) are of an integral structure.

6. The battery top cover structure according to claim 2, characterized in that, The cross section of the sealing ring (3) is in an L-shaped structure, and the L-shaped structure is used to hold up the pole column (1).

7. The battery top cover structure according to claim 6, characterized in that, A stop portion extends downward from the lower end of the L-shaped structure, and the stop portion fits against the inner side of the substrate (2); and / or, a chamfer or a fillet is provided on the outer side of the upper end of the L-shaped structure; and / or, a notch is provided at the lower outer side of the pole column (1).

8. The battery top cover structure according to claim 3, characterized in that The cross section of the pressure ring (4) is in a Z-shaped structure.

9. The battery top cover structure according to claim 8, characterized in that The upper part of the Z-shaped structure presses against the sealing ring (3) and the upper end of the support layer (5); and / or, the injection-molded surface layer (6) is adapted to be filled between the pressure ring (4) and the pole column (1); and / or, a groove for filling the injection-molded surface layer (6) is formed on the outer side of the pole column (1).

10. A battery top cover structure according to claim 8, characterized in that, The part of the cross section of the injection-molded surface layer (6) corresponding to the Z-shaped structure is in a Z-shaped structure; and / or, a step groove for embedding the bottom of the pressure ring (4) and the bottom of the injection-molded surface layer (6) is provided on the substrate.

Images