Power battery cover plate structure with good sealing performance

Abstract

The utility model discloses a power battery cover plate structure with good sealing performance, and relates to the technical field of power batteries, the power battery cover plate structure comprises a light aluminum sheet, the lower end of the light aluminum sheet is fixedly connected with a support frame, and the light aluminum sheet and the support frame are respectively provided with two pole grooves for installing conductive poles. Two groups of conductive poles are arranged and are respectively a positive pole and a negative pole, an insulating pad is fixedly arranged at the upper end of the light aluminum sheet, an upper pressing block used for connecting the conductive poles is arranged at the upper end of the insulating pad, the lower ends of the conductive poles are fixedly connected with a connecting sheet, and an anti-explosion valve is mounted at the lower end of the light aluminum sheet. The light aluminum sheet is provided with an anti-explosion through groove matched with the anti-explosion valve, and the periphery of the conductive pole is sleeved with a sealing gasket; the structure of the insulation pad is changed, and the ceramic gasket and the insulation pad are integrally injection-molded. Due to the characteristic of high temperature resistance of the ceramic, the air tightness of the battery cover plate can be ensured, and the problem of liquid leakage caused by the rebound of the compression amount of the sealing gasket is avoided.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to a power battery cover structure with good sealing performance. Background Technology

[0002] In the manufacturing process of power batteries, the cover plate, as a key component of the battery pack, directly affects the overall safety and lifespan of the battery. However, traditional power battery cover plate structures face a series of challenges during manufacturing, especially the impact of high-temperature baking on injection-molded parts, which has become a key factor restricting the improvement of battery sealing performance.

[0003] Traditional battery cover structures typically use injection-molded parts as their main components. These parts undergo a high-temperature baking process during battery manufacturing. This step aims to ensure that the materials inside the battery are fully cured, improving the battery's stability and durability. However, the injection-molded parts undergo significant changes during the high-temperature baking process, primarily shrinking and thinning. This change is typically around 20%, severely impacting the sealing performance of the cover structure.

[0004] When injection-molded parts shrink and become thinner, the originally designed compression of the sealing gasket will rebound, causing an increase in the fit gap between the sealing gasket, the cover plate, and the battery casing. This increased gap disrupts the original sealing structure, allowing gases and electrolytes generated during battery charging and discharging to leak out. Poor airtightness not only reduces battery efficiency but can also lead to serious safety hazards, such as battery swelling, leakage, or even explosion.

[0005] Furthermore, traditional cover plate structures often overlook the deformation of injection-molded parts after high-temperature baking, leading to discrepancies between the material selection, size, and installation method of the sealing gasket and actual requirements. This design deficiency further exacerbates the decline in battery sealing performance, making it impossible to guarantee the stability and reliability of the battery in harsh operating environments.

[0006] Given the numerous shortcomings of traditional power battery cover structures in terms of sealing performance, it is necessary to develop a novel power battery cover structure to address issues such as seal compression rebound, poor battery airtightness, and leakage caused by shrinkage and thinning of injection-molded parts after high-temperature baking. This will not only help improve the overall performance and safety of the battery but also provide strong technical support for the sustainable development of the power battery industry. Utility Model Content

[0007] The purpose of this utility model is to provide a power battery cover structure with good sealing performance, and to solve the technical problems of shrinkage and thinning of injection molded parts after high-temperature baking, resulting in the rebound of the compression of the sealing gasket, poor battery air tightness and leakage.

[0008] The objective of this utility model can be achieved through the following technical solutions:

[0009] A power battery cover structure with good sealing performance includes a light aluminum sheet. A support frame is fixedly connected to the lower end of the light aluminum sheet. Both the light aluminum sheet and the support frame are provided with two electrode slots for installing conductive electrode posts. There are two sets of conductive electrode posts, one positive and one negative. An insulating pad is fixedly provided at the upper end of the light aluminum sheet. An upper pressure block for connecting the conductive electrode posts is provided at the upper end of the insulating pad. A connecting piece is fixedly connected to the lower end of the conductive electrode posts. An explosion-proof valve is installed at the lower end of the light aluminum sheet. An explosion-proof through groove that cooperates with the explosion-proof valve is provided on the light aluminum sheet. A sealing gasket is sleeved on the outer periphery of the conductive electrode posts.

[0010] Preferably, the upper pressure block is provided with a trapezoidal through hole for mounting the conductive electrode post.

[0011] Preferably, the insulating pad is provided with a pressure block groove for mounting the pressure block.

[0012] Preferably, the lower end of the insulating pad is provided with a plurality of ceramic pads, and the aluminum sheet is provided with pad slots that mate with the ceramic pads.

[0013] Preferably, the aluminum sheet includes an upper cover sheet, and a lower insert sheet is fixedly disposed at the lower end of the upper cover sheet. The size of the lower insert sheet is a proportional scaling of the upper cover sheet.

[0014] Preferably, the lower end of the aluminum sheet is provided with multiple positioning posts, and the upper end of the support frame is provided with positioning grooves that cooperate with the positioning posts.

[0015] Preferably, the support frame is provided with several hollowed-out grooves.

[0016] Preferably, the lower end of the support frame is fixedly provided with a plurality of support protrusions, and the support protrusions are provided with a plurality of heat dissipation holes.

[0017] Preferably, the conductive electrode post includes an electrode post base plate, and a connecting post is provided on the electrode post base plate.

[0018] Preferably, the upper end of the connecting column is provided with a T-shaped limiting column that matches the trapezoidal through hole.

[0019] The beneficial effects of this invention are as follows: This invention changes the structure of the insulating pad by integrally injection molding the ceramic gasket with the insulating pad. Due to the high-temperature resistance of ceramics, the airtightness of the battery cover can be guaranteed, avoiding leakage problems caused by the rebound of the sealing gasket due to compression. At the same time, it can also improve the torsional resistance of the battery cover. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is an exploded three-dimensional structural diagram of a power battery cover plate structure with good sealing performance according to this utility model;

[0022] Figure 2 This is an exploded isometric view of a power battery cover structure with good sealing performance according to this utility model.

[0023] Figure 3 This is an exploded front view schematic diagram of a power battery cover structure with good sealing performance according to this utility model.

[0024] In the diagram: 1. Upper pressure block; 11. Trapezoidal through hole; 2. Insulating pad; 21. Pressure block groove; 3. Ceramic gasket; 4. Plain aluminum sheet; 41. Upper cover plate; 42. Lower insert plate; 43. Gasket slot; 44. Explosion-proof through groove; 45. Positioning post; 5. Explosion-proof valve; 6. Sealing gasket; 7. Conductive electrode post; 71. Electrode post base plate; 72. Connecting post; 73. Limiting post; 8. Connecting piece; 9. Support frame; 91. Hollowed-out groove; 92. Positioning groove; 93. Support protrusion; 94. Heat dissipation hole. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention / utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention / utility model, and not all embodiments. Based on the embodiments of the present invention / utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention / utility model.

[0026] In the description of this invention / utility model, it should be understood that the terms "upper," "lower," "left," "right," etc., indicating orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation. Therefore, they should not be construed as limitations on this utility model. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0027] In the description of this invention / utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Please see Figures 1-3 As shown, this utility model is a power battery cover structure with good sealing performance, including a light aluminum sheet 4. The lower end of the light aluminum sheet 4 is fixedly connected to a support frame 9. Both the light aluminum sheet 4 and the support frame 9 are provided with two electrode slots for installing conductive electrode posts 7. The conductive electrode posts 7 are provided in two sets, one positive and one negative. An insulating pad 2 is fixedly provided on the upper end of the light aluminum sheet 4. An upper pressure block 1 for connecting the conductive electrode posts 7 is provided on the upper end of the insulating pad 2. A connecting piece 8 is fixedly connected to the lower end of the conductive electrode posts 7. An explosion-proof valve 5 is installed on the lower end of the light aluminum sheet 4. An explosion-proof through groove 44 that cooperates with the explosion-proof valve 5 is provided on the light aluminum sheet 4. A sealing gasket 6 is sleeved on the outer periphery of the conductive electrode posts 7.

[0029] In an optional embodiment, the upper pressure block 1 is provided with a trapezoidal through hole 11 for mounting the conductive electrode post 7.

[0030] It should be noted that the trapezoidal through hole 11 improves the stability of the conductive electrode post 7 during installation.

[0031] In an optional embodiment, the insulating pad 2 is provided with a pressure block groove 21 for mounting the pressure block 1.

[0032] It should be noted that the design of the pressure block groove 21 improves the installation stability of the upper pressure block 1.

[0033] In an optional embodiment, the lower end of the insulating pad 2 is provided with a plurality of ceramic pads 3, and the aluminum sheet 4 is provided with pad slots 43 that cooperate with the ceramic pads 3.

[0034] It should be noted that the ceramic gasket 3 and the insulating gasket 2 are integrally injection molded. Due to the high temperature resistance of ceramic, the airtightness of the battery cover can be guaranteed, avoiding leakage problems caused by the rebound of the sealing gasket due to compression.

[0035] In an optional embodiment, the aluminum sheet 4 includes an upper cover sheet 41, and a lower insert sheet 42 is fixedly disposed at the lower end of the upper cover sheet 41. The size of the lower insert sheet 42 is a proportional scaling of the upper cover sheet 41.

[0036] It should be noted that the lower insert 42 is smaller than the upper cover 41 and is scaled proportionally to ensure the stability of the battery cover installation.

[0037] In an optional embodiment, the lower end of the aluminum sheet 4 is provided with a plurality of positioning posts 45, and the upper end of the support frame 9 is provided with a positioning groove 92 that cooperates with the positioning posts 45.

[0038] It should be noted that the positioning groove 92 and the positioning post 45 improve the stability of the installation of the aluminum sheet 4.

[0039] In an optional embodiment, the support frame 9 is provided with a plurality of hollowed-out grooves 91.

[0040] It should be noted that the hollowed-out groove 91 reduces the material used and weight of the battery cover.

[0041] In an optional embodiment, a plurality of support protrusions 93 are fixedly provided at the lower end of the support frame 9, and a plurality of heat dissipation holes 94 are provided on the support protrusions 93.

[0042] It should be noted that the placement of heat dissipation hole 94 ensures the heat dissipation performance of the pole.

[0043] In an optional embodiment, the conductive electrode post 7 includes an electrode post base plate 71, on which a connecting post 72 is provided.

[0044] It should be noted that the design of the pole base plate 71 facilitates a stable connection with the connecting piece 8.

[0045] In an optional embodiment, the upper end of the connecting post 72 is provided with a T-shaped limiting post 73 that cooperates with the trapezoidal through hole 11.

[0046] It should be noted that the setting of the limiting post 73 improves the installation stability of the conductive electrode post 7.

[0047] The working principle of this invention is as follows: The structure of the insulating pad 2 is modified by integrally injection molding the ceramic gasket 3 with the insulating pad 2. Due to the high-temperature resistance of ceramics, the airtightness of the battery cover is ensured, preventing leakage caused by the rebound of the compressed sealing gasket. Simultaneously, the torsional resistance of the battery cover is also improved.

[0048] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A power battery cover structure with good sealing performance, characterized in that, The device includes an aluminum sheet (4), with a support frame (9) fixedly connected to the lower end of the aluminum sheet (4). Both the aluminum sheet (4) and the support frame (9) are provided with two pole slots for installing conductive electrode posts (7). There are two sets of conductive electrode posts (7), one positive and one negative. An insulating pad (2) is fixedly provided on the upper end of the aluminum sheet (4). An upper pressure block (1) for connecting the conductive electrode posts (7) is provided on the upper end of the insulating pad (2). A connecting piece (8) is fixedly connected to the lower end of the conductive electrode posts (7). An explosion-proof valve (5) is installed on the lower end of the aluminum sheet (4). An explosion-proof through groove (44) that cooperates with the explosion-proof valve (5) is provided on the aluminum sheet (4). A sealing gasket (6) is sleeved on the outer periphery of the conductive electrode posts (7).

2. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The upper pressure block (1) is provided with a trapezoidal through hole (11) for installing the conductive electrode post (7).

3. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The insulating pad (2) is provided with a pressure block groove (21) for mounting the pressure block (1).

4. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The lower end of the insulating pad (2) is provided with a plurality of ceramic pads (3), and the aluminum sheet (4) is provided with a pad slot (43) that cooperates with the ceramic pads (3).

5. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The light aluminum sheet (4) includes an upper cover sheet (41), and a lower insert sheet (42) is fixedly provided at the lower end of the upper cover sheet (41). The size of the lower insert sheet (42) is proportionally scaled to that of the upper cover sheet (41).

6. The power battery cover structure with good sealing performance according to claim 5, characterized in that, The lower end of the aluminum sheet (4) is provided with multiple positioning posts (45), and the upper end of the support frame (9) is provided with a positioning groove (92) that cooperates with the positioning posts (45).

7. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The support frame (9) is provided with several hollowed-out grooves (91).

8. The power battery cover structure with good sealing performance according to claim 1, characterized in that, The lower end of the support frame (9) is fixedly provided with a plurality of support protrusions (93), and the support protrusions (93) are provided with a plurality of heat dissipation holes (94).

9. The power battery cover structure with good sealing performance according to claim 2, characterized in that, The conductive electrode post (7) includes an electrode post base plate (71), and a connecting post (72) is provided on the electrode post base plate (71).

10. The power battery cover structure with good sealing performance according to claim 9, characterized in that, The upper end of the connecting column (72) is provided with a T-shaped limiting column (73) that cooperates with the trapezoidal through hole (11).

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