Waterproof structure of battery

Abstract

The utility model provides a waterproof structure of a battery, which comprises a lower shell, an upper shell and a sealing structural member, the upper shell is formed by double-material injection molding and consists of a main body part and a laser connecting part, and the sealing structural member is fixed on the laser connecting part through laser welding so as to realize waterproof air tightness. The structure simplifies the production process, reduces the process variation, improves the strength and reliability, and is suitable for high protection demand scenes.

Description

Technical Field

[0001] This utility model relates to a battery, and more particularly to a waterproof battery structure. Background Technology

[0002] Currently, the casing structure of lithium-ion batteries typically includes an upper casing, a lower casing, and sealing components. After the battery casing is assembled and sealed, the high-current busbar needs to be latched. Then, the sealing components are used to seal the power connection latching holes on the upper casing to achieve the required waterproof rating. The existing sealing component technologies in the industry mainly include the following:

[0003] 1. Sealing cap with sealing ring: Assemble the sealing ring onto the sealing cap and then insert it into the upper housing to achieve sealing and waterproofing functions.

[0004] 2. Sealing cap by dispensing: The sealing cap is fixed to the upper housing with glue to form a sealing structure.

[0005] 3. Plastic laser welding sealing cap: The sealing cap is fixed to the upper shell through laser welding technology to achieve joint and seal.

[0006] While the above technologies can enable battery casings to meet waterproof standards, potential drawbacks and risks still exist:

[0007] 1. Issues with the sealing ring: Sealing caps with sealing rings are prone to losing their sealing function due to minor variations in battery casing dimensions or improper assembly of the sealing ring. Furthermore, the sealing ring material may deteriorate due to aging after prolonged use, leading to seal failure. This can allow moisture to seep in, causing internal short circuits or malfunctions in the battery.

[0008] 2. Issues with the dispensing method: Structures sealed using the dispensing method may experience deterioration due to insufficient weather resistance of the adhesive material over long-term use, further increasing the risk of leakage. Furthermore, the adhesive material has weak bonding strength, making it prone to peeling or cracking when the casing is subjected to external impact, ultimately leading to the failure of the waterproofing performance of the sealed structure.

[0009] 3. Problems with Plastic Laser Welding: While plastic laser welding technology has great potential, current techniques require coating the sealing cap surface with a laser absorber to achieve a weld joint. The coating process carries a risk of contamination, and weld quality is highly dependent on the uniformity and stability of the coating. Uneven coating or insufficient absorber quality can lead to poor welds or waterproofing failure.

[0010] In summary, the durability, reliability, and pollution risks during the production process of sealing structures have not yet been effectively addressed in the existing technologies. In particular, how to reduce processing steps and improve production efficiency while improving the waterproof performance and welding strength of sealing structures is an urgent problem that needs to be solved in this technical field. Utility Model Content

[0011] The purpose of this invention is to provide a waterproof battery structure, particularly a waterproof battery module structure that achieves sealing through laser welding. This structure includes a lower housing, an upper housing, and several sealing components. Through a specifically designed laser connection and the configuration of the sealing components, it provides excellent waterproof performance while meeting the high reliability requirements of the battery module.

[0012] This utility model provides a waterproof battery structure, comprising: a lower housing; an upper housing, the upper housing including a main body and a laser connection part, the main body covering the opening of the lower housing, the laser connection part being disposed in the main body, and the laser connection part having several locking openings; and

[0013] Several sealing structural components are respectively disposed at positions relative to the several locking openings of the laser connection portion, and seal the locking openings.

[0014] The lower housing contains several battery cells, as well as a positive busbar and a negative busbar connecting the several battery cells. Each of the positive busbar and the negative busbar is provided with a locking connection part.

[0015] The locking openings of the laser connectors are respectively located facing each locking connector.

[0016] The laser connection part is made of laser-absorbing material.

[0017] The main body and the laser connection part are manufactured using a dual-material injection molding process.

[0018] The laser connector is made of laser-absorbing material, and the main body and the laser connector are manufactured using a dual-material injection molding process.

[0019] The two sealing structures are made of laser-penetrating material, and the laser connection part is connected to the sealing structure by a laser welding process. Attached Figure Description

[0020] Figure 1 This is a three-dimensional exploded view of the present invention.

[0021] Figure 2 This is a schematic diagram of the assembly of the upper shell of this utility model.

[0022] Figure 3 This is a schematic diagram of the upper shell assembly from another perspective of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1-lower housing; 2-upper housing; 20-main body; 22-laser connection part; 220-locking opening; 3-sealing structure; 4-battery cell; 5-positive busbar; 6-negative busbar; 50(60)-locking connection part. Detailed Implementation

[0024] Embodiments of this utility model will be further explained below with reference to the accompanying drawings. Wherever possible, the same reference numerals represent the same or similar components in the drawings and description. In the drawings, shapes and thicknesses may be exaggerated for simplicity and convenience. It is understood that components not specifically shown in the drawings or described in the description are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications based on the content of this utility model.

[0025] like Figures 1-3 As shown, this utility model provides a waterproof battery structure, including a lower shell 1, an upper shell 2, and a sealing structure 3. Through the innovative design of the upper shell 2, the lower shell 1, and the sealing structure 3, excellent waterproof performance and convenient assembly are achieved. The following is a detailed description of the specific embodiments and the advantages of the structural design of each part.

[0026] The lower housing 1 serves as the external protective housing for the entire battery module, accommodating the internal components of the battery module, including multiple battery cells 4 and a positive busbar 5 and a negative busbar 6 connecting the multiple battery cells 4. Both the positive busbar 5 and the negative busbar 6 are provided with locking connection portions 50 (60), through which the multiple battery cells 4, the positive busbar 5, and the negative busbar 6 are fixedly and electrically connected.

[0027] The upper housing 2 includes a main body 20 and a laser connection part 22. The main body 20 is made of a plastic material with high strength and good mechanical properties. The main body 20 covers the opening 10 of the lower housing 1 to form a sealed space. The laser connection part 22 is integrally formed with the main body 20 and is made of laser-absorbing material, which has high welding efficiency and reliability. The laser connection part 22 is provided with several locking openings 220 for cooperating with the sealing structure 3. The advantage of this design is that the laser connection part 22, as an independent area, can precisely control the welding position and intensity, ensuring sealing performance while reducing the thermal impact on the main body 20. Furthermore, the locking connection part 50 (60) corresponds to the locking opening 220 of the laser connection part 22, so that no additional adjustment is required during laser welding. The advantage of this structural design is that it can effectively reduce assembly errors, improve waterproof performance, and improve assembly efficiency.

[0028] The sealing structure 3 is made of laser-penetrating material and corresponds to the locking opening 220 of the laser connection part 22. It is firmly connected to the laser connection part 22 by laser welding. The sealing structure 3 not only provides reliable sealing performance, but also simplifies the manufacturing process by eliminating the need for additional adhesives or mechanical fasteners, thus improving the overall waterproof effect and durability.

[0029] To further optimize the manufacturing process, the main body 20 and laser-connected part 22 of the upper housing 2 are manufactured in one piece using a dual-material injection molding process. This process can maintain the integrity of the components while ensuring the properties of different materials. Compared with the traditional component assembly method, the dual-material injection process reduces production costs and reduces potential leakage points. Its advantage is that it significantly improves the consistency and reliability of the product.

[0030] In summary, the waterproof battery structure of this utility model, through the rational design of the upper shell 2, lower shell 1 and sealing structure 3, combined with laser welding and dual-material injection molding processes, achieves excellent waterproof performance and convenient assembly process, and is suitable for battery module application scenarios with high waterproof performance requirements.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes and modifications made in accordance with the shape, structure, features and spirit of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A waterproof battery structure, characterized in that, include: Lower housing; An upper housing, comprising a main body and a laser connection portion, wherein the main body covers the opening of the lower housing, the laser connection portion is disposed within the main body, and the laser connection portion has several locking openings; and Several sealing structural components are respectively disposed at positions relative to the several locking openings of the laser connection portion, and seal the locking openings.

2. The waterproof battery structure according to claim 1, characterized in that, The lower housing contains several battery cells, as well as a positive bus and a negative bus connecting the several battery cells. Each of the positive bus and the negative bus is provided with a locking connection part.

3. The waterproof battery structure according to claim 2, characterized in that, The locking openings of the laser connectors are respectively located facing each locking connector.

4. The waterproof battery structure according to claim 1, characterized in that, The laser connector is made of laser-absorbing material.

5. The waterproof battery structure according to claim 1, characterized in that, The main body and the laser-connected part are manufactured using a dual-material injection molding process.

6. The waterproof battery structure according to claim 5, characterized in that, The laser connector is made of laser-absorbing material, and the main body and the laser connector are manufactured using a dual-material injection molding process.

7. The waterproof battery structure according to claim 6, characterized in that, The plurality of sealing structural components are made of laser-penetrating material, and the laser connection part is connected to the sealing structural components by a laser welding process.

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