Cylindrical lithium ion battery with holes in positive and negative electrode foils
By creating perforations in the positive and negative electrode foils and combining them with micromachining technology, the problems of uneven electrolyte injection and slow wetting rate in traditional lithium-ion batteries have been solved. This has enabled the electrolyte to quickly penetrate into the core, shortening the injection time and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN CBAK POWER BATTERY CO LTD
- Filing Date
- 2025-03-31
- Publication Date
- 2026-04-17
AI Technical Summary
Traditional lithium-ion batteries, with their small internal gaps in the tabs, suffer from uneven electrolyte injection and slow wetting rate. This makes it difficult for the electrolyte to quickly enter the core, prolonging the injection time and reducing battery performance and production efficiency.
Perforations are made in the positive and negative electrode foils to form a hollow roll. The perforations accelerate the penetration of electrolyte into the core. Combined with mechanical or laser micromachining technology, the perforation positions are ensured to avoid areas where active materials are easily detached. Gravity vertical liquid injection is used to improve the injection efficiency.
By creating perforations in the positive and negative electrode foils, the electrolyte can quickly penetrate into the core, shortening the injection time, improving injection efficiency, reducing production costs, and enhancing battery performance.
Smart Images
Figure CN224138150U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium-ion battery technology, and in particular to a cylindrical lithium-ion battery with perforations in the positive and negative electrode foils. Background Technology
[0002] Lithium-ion batteries are widely used in various fields, such as consumer electronics, electric vehicles, and energy storage systems, due to their high energy density and long lifespan. However, as these applications place increasingly higher demands on battery performance, traditional battery manufacturing methods face numerous challenges.
[0003] In the production process of lithium-ion batteries, the electrolyte injection process is a key step in injecting electrolyte into the battery casing, which directly affects the overall production efficiency and performance of the battery.
[0004] In traditional methods, due to the small gaps inside the tabs, there is often uneven electrolyte injection, slow wetting rate, and difficulty in the electrolyte quickly entering the core, resulting in long battery injection time, performance degradation, and low production efficiency. Therefore, this utility model proposes a cylindrical lithium-ion battery with perforations in the positive and negative electrode foils to solve the above problems. Utility Model Content
[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as small internal gaps in the tabs, uneven electrolyte injection, slow wetting rate, difficulty in rapid electrolyte entry into the core, resulting in long battery injection time, performance degradation, and low production efficiency. This invention proposes a cylindrical lithium-ion battery with perforations in the positive and negative electrode foils.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A cylindrical lithium-ion battery with perforations in the positive and negative electrode foils, including
[0008] Positive current collector;
[0009] The coil is fixedly connected to the positive current collector;
[0010] The negative electrode current collector is fixedly connected to the coil.
[0011] As a preferred embodiment of this utility model, the positive electrode current collector is provided with multiple positive electrode perforations.
[0012] As a preferred embodiment of this utility model, the negative electrode current collector is provided with multiple negative electrode perforations.
[0013] In a preferred embodiment of this invention, the roll has a hollow structure. Beneficial effects
[0014] In this invention, by forming perforations on the positive and negative electrode foils, the electrolyte can quickly penetrate into the core through the perforations, improving the electrolyte injection efficiency, greatly shortening the injection time, thereby shortening the battery production cycle and reducing production costs. Attached Figure Description
[0015] Figure 1 This is a front view of the positive current collector of this utility model;
[0016] Figure 2 This is an enlarged front view of the positive current collector of this utility model;
[0017] Figure 3 This is a front view of the core of this utility model;
[0018] Figure 4 This is a front view of the negative electrode current collector of this utility model;
[0019] Figure 5 This is a magnified front view of the negative electrode current collector of this utility model.
[0020] In the diagram: 1. Positive current collector; 2. Rolled shape; 3. Negative current collector. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Example
[0022] Reference Figures 1-5 A cylindrical lithium-ion battery with perforations in the positive and negative electrode foils, including
[0023] Positive current collector 1;
[0024] Roll 2 is fixedly connected to the positive current collector 1;
[0025] The negative electrode current collector 3 is fixedly connected to the coil 2.
[0026] With the above structure, by forming perforations on the positive and negative electrode foils, the electrolyte can quickly penetrate into the core through the perforations, which improves the electrolyte injection efficiency, greatly shortens the injection time, thereby shortening the battery production cycle and reducing production costs.
[0027] As a preferred embodiment of this utility model, the positive electrode current collector 1 is provided with multiple positive electrode perforations.
[0028] As a preferred embodiment of this utility model, the negative electrode collector 3 is provided with multiple negative electrode perforations.
[0029] As a preferred embodiment of this utility model, the roll 2 has a hollow structure.
[0030] It should be noted that the specific model of motor used should be selected by those skilled in the art, and the motors mentioned above are all existing technologies, which will not be elaborated upon in this solution.
[0031] The working principle of this utility model is as follows: After the positive and negative electrode sheets and the separator are wound to form a core, micro-machining techniques such as mechanical perforation or laser perforation are precisely used to drill tiny through holes at the corresponding positions of the positive and negative electrodes. These holes are distributed in an array or at a specific interval, avoiding areas where active material is easily detached, ensuring the mechanical strength and overall integrity of the core, and avoiding damage to other structures of the core. The positive and negative current collectors 3 are welded to the positive and negative electrodes of the core respectively. At the same time, the positive electrode is wrapped with high-temperature tape and then inserted into the shell. The core is ultrasonically welded to the bottom of the steel shell through the negative current collector 3, and then grooved. The electrolyte is injected vertically into the cell. Under the influence of gravity, the electrolyte quickly penetrates into the cell through the hole area, greatly reducing the injection time. Subsequently, the battery undergoes cap welding, cap closing, sealing, cleaning, oiling, heat shrinking, coding, pre-capacitance, and other processes. Cells that have not undergone perforation and are produced normally are injected with electrolyte at an injection temperature of 20°C, a pressure of 0.6 MPa, and an injection time of 1.2 hours. The prepared core was placed on a dedicated perforation device. Perforations were made on the positive side of the core with a diameter of 1 mm, a depth of 0.8 mm, and a spacing of 2.5 mm. Perforations were made on the negative side with a diameter of 0.65 mm, a depth of 0.5 mm, and a spacing of 1.5 mm. Then, the process of welding the manifold, inserting it into the shell, spot welding, and grooving liquid injection was carried out normally. The liquid injection temperature was 20℃, the pressure was 0.6 MPa, and the injection time was 0.85 h, which improved the liquid injection efficiency by 30%.
[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A cylindrical lithium ion battery in which positive and negative electrode foils are perforated, characterized by, include Positive current collector (1); The coil (2) is fixedly connected to the positive current collector (1); The negative electrode current collector (3) is fixedly connected to the coil (2).
2. The cylindrical lithium ion battery of claim 1, wherein, The positive current collector (1) has multiple positive current through holes.
3. The cylindrical lithium ion battery with positive and negative electrode foils perforated according to claim 1, wherein The negative electrode collector (3) has multiple negative electrode perforations.
4. The cylindrical lithium ion battery with positive and negative electrode foils perforated according to claim 1, wherein The roll (2) has a hollow structure.