Lithium ion battery semi-automatic winding device capable of reducing self-discharge rate

Abstract

The utility model discloses a lithium ion battery semi-automatic winding device capable of reducing self-discharge rate, which comprises a machine table, an upper diaphragm winding unit and a lower diaphragm winding unit are arranged on the machine table, a first baffle is arranged above the upper diaphragm winding unit, and a second baffle is arranged above the lower diaphragm winding unit. The lithium ion battery semi-automatic winding device capable of reducing the self-discharge rate has the characteristics of low self-discharge rate, simple structure and strong applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries, and specifically relates to a semi-automatic winding device for lithium-ion batteries capable of reducing the self-discharge rate. Background Art

[0002] Self-discharge is the loss of charge in a battery due to internal chemical reactions when the battery is not connected to a load. The self-discharge rate of lithium-ion batteries is generally low, but it can increase under certain conditions, primarily due to dust.

[0003] The impact of dust on lithium-ion batteries is mainly reflected in the following aspects:

[0004] For example, in terms of conductivity: certain types of dust (such as metal dust) may be conductive, causing internal short circuits in the battery, thereby accelerating self-discharge.

[0005] For example, in terms of chemical reactions: the chemical components in the dust may react with the battery materials, causing changes in the internal chemical environment of the battery, thereby affecting the self-discharge rate.

[0006] For example, physical obstacles: the accumulation of dust may hinder the heat dissipation of the battery, causing the temperature to rise, thereby accelerating the self-discharge process.

[0007] High concentrations of dust may cause contamination on the surface and inside of the battery, increase the internal resistance of the battery, and affect the overall performance of the battery.

[0008] Currently, during the lithium-ion battery manufacturing process, dust is primarily removed by brushing the positive and negative electrode sheets, but there are no corresponding measures for removing dust from the separator. Separators have a certain amount of static electricity, and during the winding process, the separators are not protected from dust. Dust generated during the feeding of the positive and negative electrode sheets can fall onto the separators and into the battery cells, affecting the battery's appearance and performance. Utility Model Content

[0009] The utility model aims to provide a semi-automatic winding device for lithium-ion batteries capable of reducing the self-discharge rate, which has the characteristics of low self-discharge rate, simple structure and strong applicability.

[0010] The utility model can be realized by the following technical solutions:

[0011] The utility model discloses a semi-automatic winding device for lithium-ion batteries for reducing the self-discharge rate. The device comprises a machine platform, an upper diaphragm winding unit and a lower diaphragm winding unit are arranged on the machine platform, a first baffle is arranged above the upper diaphragm winding unit, and a second baffle is arranged above the lower diaphragm winding unit.

[0012] Furthermore, the upper diaphragm winding unit includes an upper diaphragm unwinding roller, several first transition rollers and a first guide roller group, and the first baffle is arranged directly above the upper diaphragm unwinding roller, several first transition rollers and the first guide roller group to effectively protect against dust falling from above.

[0013] Furthermore, the lower diaphragm winding unit includes a lower diaphragm unwinding roller, several second transition rollers and a second guide roller group, and the second baffle is arranged above the lower diaphragm unwinding roller, several second transition rollers and the second guide roller group to effectively protect dust falling from above.

[0014] Furthermore, a needle roller is provided between the first guide roller group and the second guide roller group, and the diaphragm guided by the upper diaphragm winding unit and the lower diaphragm winding unit is wound into shape by the needle roller, thereby effectively ensuring the continuity of the winding.

[0015] Furthermore, several first transition rollers are staggered up and down, and several second transition rollers are staggered up and down, which has better traction.

[0016] Furthermore, the upper diaphragm winding unit and the lower diaphragm winding unit are both arranged on the side of the machine, forming an unobstructed operating space.

[0017] Furthermore, the first baffle and the second baffle are detachably arranged vertically on the side of the machine, making it easy to clean and maintain.

[0018] Furthermore, the separator is a PE film, a PP film, a PP / PE composite film or a non-woven film, which meets the winding requirements of different types of separators.

[0019] Furthermore, the lithium-ion battery is a lithium iron phosphate battery, a lithium cobalt oxide battery, a lithium manganese oxide battery or a ternary material battery to meet the manufacturing needs of different types of batteries.

[0020] Furthermore, the lithium-ion battery is a cylindrical steel shell battery, a square aluminum shell battery or a square aluminum-plastic film battery.

[0021] The utility model provides a semi-automatic winding device for lithium-ion batteries for reducing the self-discharge rate, which has the following beneficial effects:

[0022] In the present invention, reducing dust intrusion into the battery cells is crucial during the battery manufacturing process, particularly during the winding process, as dust can affect the quality and performance of the cells. Therefore, a first baffle and a second baffle are installed on the semi-automatic winding machine to form a physical barrier during the winding process. This reduces the risk of dust generated by friction between the positive and negative electrodes and the equipment, which could fall into the diaphragm and then be drawn into the battery cells, causing internal battery contamination. This effectively reduces battery self-discharge. Furthermore, the present invention has a simple structure and can be installed on the existing machine, making it highly adaptable.

[0023] In order to facilitate maintenance and cleaning, the diaphragm baffle is usually designed to be removable or adjustable so that it can be cleaned or replaced when necessary. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attachment Figure 1 This is a schematic diagram of the exploded structure of a semi-automatic winding device for lithium-ion batteries that reduces the self-discharge rate of the utility model;

[0025] The marks in the accompanying drawings include: 100, upper diaphragm winding unit; 110, upper diaphragm unwinding roller; 120, first transition roller; 130, first guide roller group; 140, first baffle; 200, lower diaphragm winding unit; 210, lower diaphragm unwinding roller; 220, second transition roller; 230, second guide roller group; 240, second baffle; 300, needle roller. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in further detail below in conjunction with embodiments.

[0027] like Figure 1 As shown, the utility model discloses a semi-automatic winding device for lithium-ion batteries for reducing the self-discharge rate, including a machine platform, on which an upper diaphragm winding unit 100 and a lower diaphragm winding unit 100 are arranged, a first baffle 140 is arranged above the upper diaphragm winding unit 100, and a second baffle 240 is arranged above the lower diaphragm winding unit 200.

[0028] like Figure 1 As shown, the upper diaphragm winding unit 100 includes an upper diaphragm unwinding roller 110, several first transition rollers 120 and a first tape guide roller group 130, and the first baffle 140 is arranged directly above the upper diaphragm unwinding roller 110, several first transition rollers 120 and the first tape guide roller group 130.

[0029] like Figure 1 As shown, the lower diaphragm winding unit 200 includes a lower diaphragm unwinding roller 210, several second transition rollers 220 and a second tape guide roller group 230, and the second baffle 240 is arranged above the lower diaphragm unwinding roller 210, several second transition rollers 220 and the second tape guide roller group 230.

[0030] like Figure 1 As shown, a needle roller 300 is further provided between the first guide roller group 130 and the second guide roller group 230 , and the diaphragm guided by the upper diaphragm winding unit 100 and the lower diaphragm winding unit 200 is wound and formed by the needle roller 300 .

[0031] like Figure 1 As shown, a plurality of first transition rollers 120 are staggered in vertical arrangement, and a plurality of second transition rollers 220 are staggered in vertical arrangement.

[0032] like Figure 1 As shown, the upper diaphragm winding unit 100 and the lower diaphragm winding unit 200 are both arranged on the side of the machine. Correspondingly, the first baffle 140 and the second baffle 240 are vertically arranged on the side of the machine in a detachable manner.

[0033] The utility model has good applicability, for example, when the separator is a PE film, a PP film, a PP / PE composite film, or a non-woven film; when the lithium-ion battery is a lithium iron phosphate battery, a lithium cobalt oxide battery, a lithium manganese oxide battery, or a ternary material battery; and when the lithium-ion battery is a cylindrical steel-cased battery, a square aluminum-cased battery, or a square aluminum-plastic film battery.

[0034] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In order to effectively verify the technical effect of the present invention, two comparative experiments were conducted: the first group was equipped with the first and second baffles of the present invention; the second group was equipped without the corresponding baffles. The two groups were tested on winding batteries of different models. The specific test results are shown in Table 1:

[0036] Table 1 Test results

[0037]

[0038] Testing revealed that the K-value pass rate for the first group of devices with baffles added ranged from 97.9% to 99.36%, while the pass rate for the second group of devices without baffles ranged from 56.46% to 92.69%. The first group performed significantly better than the second. Based on these data, adding baffles reduced dust contamination inside the battery, improved self-discharge, and further enhanced battery performance and lifespan.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0040] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0041] The above embodiments are merely specific embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art will be able to make various modifications and improvements without departing from the scope of the present invention, and these obvious alternatives are all within the scope of protection of the present invention.

Claims

1. A semi-automatic winding device for lithium-ion batteries to reduce self-discharge rate, comprising a machine platform, an upper diaphragm winding unit and a lower diaphragm winding unit provided on the machine platform, characterized in that: A first baffle is provided above the upper diaphragm winding unit, and a second baffle is provided above the lower diaphragm winding unit.

2. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 1, characterized in that: The upper diaphragm winding unit includes an upper diaphragm unwinding roller, a plurality of first transition rollers and a first tape guide roller group, and the first baffle is arranged directly above the upper diaphragm unwinding roller, the plurality of first transition rollers and the first tape guide roller group.

3. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 2, characterized in that: The lower diaphragm winding unit includes a lower diaphragm unwinding roller, a plurality of second transition rollers and a second tape guide roller group, and the second baffle is arranged above the lower diaphragm unwinding roller, the plurality of second transition rollers and the second tape guide roller group.

4. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 3, characterized in that: A needle roller is further provided between the first guide roller group and the second guide roller group, and the diaphragm guided by the upper diaphragm winding unit and the lower diaphragm winding unit is wound into shape by the needle roller.

5. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 4, characterized in that: The plurality of first transition rollers are staggered up and down, and the plurality of second transition rollers are staggered up and down.

6. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 5, characterized in that: The upper diaphragm winding unit and the lower diaphragm winding unit are both arranged on the side of the machine.

7. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 6, characterized in that: The first baffle and the second baffle are detachably arranged vertically on the side of the machine.

8. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 7, characterized in that: The separator is a PE film, a PP film, a PP / PE composite film or a non-woven film.

9. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 8, characterized in that: The lithium-ion battery is a lithium iron phosphate battery, a lithium cobalt oxide battery, a lithium manganese oxide battery or a ternary material battery.

10. The semi-automatic winding device for lithium-ion batteries with reduced self-discharge rate according to claim 9, characterized in that: The lithium-ion battery is a cylindrical steel shell battery, a square aluminum shell battery or a square aluminum-plastic film battery.

Images