Splicing type aluminum shell
By using a spliced aluminum shell design and laser welding technology, the problems of aluminum shell material waste and corrosion have been solved, resulting in cost reduction and service life extension.
Patent Information
- Application Number
- CN202421989276.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The existing aluminum shell forming process leads to material waste and excessive costs. At the same time, the bottom of the aluminum shell is prone to corrosion, which affects its service life.
It adopts a spliced aluminum shell design, which reduces the thickness of the bottom of the aluminum shell through a split structure and laser welding connection, and sets a UV insulation layer on the inner side wall to isolate the electrolyte.
It reduces the production cost of aluminum casings and extends their service life by reducing the use of raw materials and preventing rust.
Smart Images
Figure CN223514079U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of battery cell aluminum shell, in particular to a spliced aluminum shell. BACKGROUND
[0002] The main role of the aluminum shell of the secondary battery cell is to serve as the carrier of the electrolyte, and it is used to isolate the inside and outside of the cell, and has a certain strength (thickness) to withstand the impact of air pressure without deformation or damage.
[0003] With the growing energy storage market, energy storage battery products are developing towards large capacity. The cost of the aluminum shell structure in the battery is divided into material cost and processing cost. The use of large-capacity batteries will make the cost of individual parts too high, which is not conducive to the cost reduction of the entire battery. The specific performance is as follows: the forming process of the aluminum shell is usually one-body stretching process. In the conventional design, the aluminum shell is divided into large surface, side surface and bottom surface. The bottom aluminum sheet base material is stretched into an aluminum shell through a mold. The common design is that the thickness of the large surface is 0.6mm, the thickness of the side surface is 0.8mm, and the thickness of the bottom is 1.5mm. The bottom of the battery is usually in contact with the bottom of the module in the module, so it does not need a thickness of 1.5mm, but without a thickness of 1.5mm, it cannot be stretched to a higher height, so it is wasted. Therefore, it is necessary to develop a new process and structure for cost reduction design.
[0004] At the same time, the positive and negative poles of the bare battery inside the battery exist in the corrosion condition in the height direction and the bottom of the aluminum shell. The existing aluminum shell stretching process cannot apply an insulating layer to the bottom to ensure that the bare battery and the aluminum shell are completely insulated. Therefore, the risk cannot be eliminated, and a new spliced aluminum shell design is urgently needed to replace the existing design scheme. UTILITY MODEL CONTENTS
[0005] The utility model aims at providing a spliced aluminum shell to reduce the production cost of the aluminum shell and solve the problem of reduced service life caused by rust on the bottom of the aluminum shell.
[0006] To solve the above technical problems, the utility model provides a spliced aluminum shell, which comprises a first part, a second part and an insulating layer.
[0007] The first part and the second part are fixedly connected, and an electrolyte chamber is formed between the first part and the second part.
[0008] The insulating layer is arranged on the bottom wall and the side wall of the second part.
[0009] Further, the first part and the second part are fixedly connected through a laser welding layer.
[0010] Further, the first part comprises two groups of aluminum plates, and the two groups of aluminum plates are arranged in parallel.
[0011] Furthermore, the two sets of aluminum plates may be configured with equal or unequal thickness.
[0012] Furthermore, the thickness of the aluminum plate is 0.6mm to 0.8mm.
[0013] Furthermore, the second part includes a base plate and a base plate sidewall;
[0014] The base plate is fixedly connected to the side wall of the base plate;
[0015] The thickness of the sidewall of the base plate is equal to the thickness of the aluminum plate.
[0016] Furthermore, the height of the sidewall of the base plate is greater than the height of the insulating layer.
[0017] Furthermore, the height h of the sidewall of the base plate is 0mm < h ≤ 60mm.
[0018] Furthermore, the insulating layer is a UV coating.
[0019] Furthermore, the thickness of the UV coating is 0.01mm to 0.3mm, and the height of the UV coating is 0mm to 20mm.
[0020] Compared with the prior art, the present invention has at least the following beneficial effects:
[0021] This utility model features a split-type aluminum shell design. While ensuring the normal operation of the aluminum shell, the thickness of the bottom plate can be reduced, decreasing the amount of raw materials used in its production and thus lowering production costs. Furthermore, an insulating layer is provided at the bottom of the aluminum shell. This insulating layer isolates the bottom sidewalls and bottom wall of the aluminum shell, effectively reducing electrolyte corrosion and extending the shell's service life. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the overall structure of the spliced aluminum shell of this utility model;
[0023] Figure 2 This is a schematic diagram of the second part of the spliced aluminum shell structure of this utility model. Detailed Implementation
[0024] The splicing aluminum shell of this utility model will now be described in more detail with reference to the schematic diagrams, which illustrate preferred embodiments of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit this utility model.
[0025] The present invention will be described in more detail below by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.
[0026] like Figure 1 and Figure 2 As shown in the figure, this utility model embodiment proposes a spliced aluminum shell, including a first part 1, a second part 2 and an insulating layer 3.
[0027] Specifically, the first part 1 is fixedly connected to the second part 2, and an electrolyte chamber 4 is formed between the first part 1 and the second part 2.
[0028] The insulating layer 3 is disposed on the inner sidewall of the second part 2.
[0029] In existing technologies, the forming process for aluminum shells is a one-piece stretching process. In conventional designs, the aluminum shell is divided into a large surface, side surfaces, and a bottom surface. The bottom aluminum sheet substrate is gradually stretched into the aluminum shell using a mold. A common design is a thickness of 0.6mm for the large surface, 0.8mm for the side surfaces, and 1.5mm for the bottom surface. However, in battery cell assembly, the bottom of the cell usually contacts the bottom of the module, so a thickness of 1.5mm is not required. But without a thickness of 1.5mm, it is impossible to stretch it to a greater height, resulting in waste and higher production costs for aluminum shells.
[0030] To address the aforementioned issues, in this embodiment, the first part 1 and the second part 2 are designed as separate units. Since the aluminum shell does not require a single-piece stretching process, the bottom surface thickness of the aluminum shell does not need to be achieved using a thicker aluminum plate (e.g., 1.5mm). The bottom surface thickness of the aluminum shell can be reduced as needed without considering the requirements of the first part 1, thus saving raw materials for aluminum shell production and significantly reducing production costs.
[0031] In addition, an insulating layer 3 is provided on the inner wall of the second part 2. The insulating layer 3 can isolate the electrolyte from the side wall and bottom wall of the second part 2, so that the electrolyte cannot directly contact the side wall and bottom wall of the second part, thereby greatly reducing the corrosion of the second part 2 by the electrolyte and thus improving the service life of the aluminum shell.
[0032] In one specific embodiment, the first part 1 and the second part 2 are fixedly connected by a laser welding layer 5.
[0033] In this process, laser welding layer 5 connects the second part 2 and the first part 1 using laser welding technology. Laser welding is a highly efficient and precise welding method that uses a high-energy-density laser beam as a heat source. The principle of heat conduction laser welding is as follows: laser radiation heats the surface to be processed, and the surface heat diffuses into the interior through heat conduction. By controlling laser parameters such as the width, energy, peak power, and repetition frequency of the laser pulse, the workpiece is melted to form a specific molten pool.
[0034] Furthermore, the first part 1 includes two sets of aluminum plates 8, and the two sets of aluminum plates 8 are arranged in parallel.
[0035] Specifically, Part 1 is a rectangular cylindrical structure, and it is manufactured using a one-piece extrusion molding process. Metal extrusion molding, also known as compression molding, is an efficient, continuous, and low-cost processing method widely used in the molding and processing of materials such as polymers and metals. Aluminum extrusion molding includes processes such as feeding, melt plasticizing, extrusion molding, shaping, and cooling. The extrusion process can be divided into two stages: plasticizing and shaping. Extrusion molding results in less material waste and improves material utilization. In addition, due to its continuous and highly automated nature, extrusion molding can reduce the production cost per unit product.
[0036] In one specific embodiment, the thickness of the aluminum plate 8 is 0.6 mm to 0.8 mm. The thickness of the aluminum plate 8 can also be 0.65 mm, 0.7 mm, or 0.75 mm. Furthermore, the two sets of aluminum plates 8 can be of equal or unequal thickness.
[0037] Furthermore, the second part 2 includes a base plate 6 and a base plate sidewall 7, the base plate 6 and the base plate sidewall 7 are fixedly connected, and the thickness of the base plate sidewall 7 is equal to the thickness of the aluminum plate 8.
[0038] Specifically, the base plate sidewall 7 is fixedly connected to the first part 1 by laser welding. To facilitate welding between the base plate sidewall 7 and the first part 1, the thickness of the base plate sidewall 7 is equal to the thickness of the aluminum plate 8. During welding between the base plate sidewall 7 and the aluminum plate 8, the weld seam is flush on both sides for easy welding.
[0039] In one specific embodiment, the height of the base plate sidewall 7 is greater than the height of the insulating layer 3, and the height h of the base plate sidewall 7 is 0 mm < h ≤ 60 mm. Specifically, the height of the base plate sidewall 7 can be 10 mm, 20 mm, 30 mm, ..., 50 mm.
[0040] Furthermore, the insulating layer 3 is a UV coating.
[0041] Specifically, the thickness of the UV coating is 0.01mm to 0.3mm, and the height of the UV coating is 0mm to 20mm.
[0042] In this embodiment, the UV coating uses an insulating material, such as UV insulating ink. The UV coating is applied to the inner wall of the second part 2 before laser welding. UV insulating ink is an environmentally friendly ink. Like ordinary UV ink, its curing relies on ultraviolet irradiation. Ultraviolet light of different wavelengths and energies polymerizes the monomers in the ink binder, thereby achieving film formation and drying. In this process, a UV LED curing machine plays a crucial role because it provides the necessary UV energy to promote ink curing.
[0043] It should be noted that laser welding achieves welding by focusing a high-energy laser beam onto the weld seam, causing the weld area to heat up and melt rapidly, followed by rapid cooling and solidification. During the welding process, the energy of the laser beam is absorbed by the workpiece, generating a large amount of heat. This heat causes the temperature of the weld area to rise, even exceeding the melting point of the workpiece material, forming a molten pool. Because the UV coating is not heat-resistant, there is a certain space between the UV coating and the welding position of Part 2 (i.e., the height of the insulating layer 3 is less than the height of the bottom plate sidewall) to ensure that it will not affect the UV coating, thereby ensuring the UV coating's corrosion protection for the bottom sidewall and bottom wall of the aluminum shell.
[0044] Compared with the prior art, the present invention has at least the following beneficial effects:
[0045] This utility model features a split-type aluminum shell design. While ensuring the normal operation of the aluminum shell, the thickness of the bottom plate can be reduced, decreasing the amount of raw materials used in its production and thus lowering production costs. Furthermore, an insulating layer is provided at the bottom of the aluminum shell. This insulating layer isolates the bottom sidewalls and bottom wall of the aluminum shell, effectively reducing electrolyte corrosion and extending the shell's service life.
[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A type of modular aluminum shell, characterized in that, Includes the first part, the second part, and the insulating layer; The first part is fixedly connected to the second part, and an electrolyte chamber is formed between the first part and the second part; The insulating layer is disposed on the bottom wall and side wall of the second part.
2. The spliced aluminum shell as described in claim 1, characterized in that, The first part and the second part are fixedly connected by a laser welding layer.
3. The spliced aluminum shell as described in claim 1, characterized in that, The first part includes two sets of aluminum plates, and the two sets of aluminum plates are arranged in parallel.
4. The spliced aluminum shell as described in claim 3, characterized in that, The two sets of aluminum plates are configured with equal or unequal thickness.
5. The spliced aluminum shell as described in claim 3, characterized in that, The thickness of the aluminum plate is 0.6mm to 0.8mm.
6. The spliced aluminum shell as described in claim 3, characterized in that, The second part includes a base plate and the sidewalls of the base plate; The base plate is fixedly connected to the side wall of the base plate; The thickness of the sidewall of the base plate is equal to the thickness of the aluminum plate.
7. The spliced aluminum shell as described in claim 6, characterized in that, The height of the sidewall of the base plate is greater than the height of the insulating layer.
8. The spliced aluminum shell as described in claim 6, characterized in that, The height h of the sidewall of the base plate is 0mm < h ≤ 60mm.
9. The spliced aluminum shell as described in claim 1, characterized in that, The insulating layer is a UV coating.
10. The spliced aluminum shell as described in claim 9, characterized in that, The thickness of the UV coating is 0.01mm to 0.3mm, and the height of the UV coating is 0mm to 20mm.