Battery central tube and battery

Abstract

The utility model discloses a battery central tube and a battery, the battery central tube comprises a central body, the central body is arranged in a roll core of the battery, and the central body is an aerogel structure body. Through the application of the aerogel central tube structure, the aerogel central tube structure suitable for the cylindrical battery is provided, the wettability of electrolyte in the battery can be effectively improved, the infiltration rate of the electrolyte in the periodic extrusion and infiltration process is promoted, and the electrical performance exertion of the battery is ensured; meanwhile, after the aerogel absorbs the electrolyte, the aerogel is converted into lyogel and is tightly attached to the inner wall of the roll core through the swelling effect, and the collapse problem of the center hole is relieved; the central tube has the characteristics of simple structure, light weight, flame retardance and acid and alkali resistance, the service life of the central tube is further prolonged, the infiltration of electrolyte and the transmission of gas generated in the working process of the battery can be promoted through the porous outer wall, and the cycle life of the battery is favorably prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery center tube and a battery. Background Art

[0002] At present, cylindrical batteries are usually produced based on the winding process. When the finished product is produced, a center hole will be formed in the center of the battery. During the use of the battery, especially for the silicon negative electrode system with large expansion changes, the sudden increase in pressure inside the winding core often causes the electrolyte to be periodically squeezed out and infiltrated. The speed of infiltration limits the performance of the battery to a certain extent. In addition, there is also the problem of collapse of the pole piece with the center hole, which can easily shorten the battery life and cause safety problems.

[0003] In the prior art, a central tube structure is generally used to support the inside of the winding core along the central hole, thereby alleviating the collapse of the central hole pole piece. However, the tube wall of such a central tube will hinder the infiltration of the electrolyte and the flow of internal gas, and also affect the performance of the battery. In addition, during use, there is often a certain deviation between the diameter of the central tube and the size of the cylindrical central hole, which makes the outer wall of the central tube of the cylindrical battery and the inner circle of the winding core not fit tightly, resulting in the possibility of collapse on the inside of the winding core. Utility Model Content

[0004] In view of this, in order to solve the above problems, the purpose of the present utility model is to provide a battery center tube, including: a center body, the center body is arranged in the winding core of the battery, and the center body is an aerogel structure.

[0005] In another preferred embodiment, the central body is provided in a tubular structure or a rod-shaped structure.

[0006] In another preferred embodiment, a porous structure is formed on the outer wall of the central body.

[0007] In another preferred embodiment, the outer wall of the central body fits the inner wall of the winding core.

[0008] In another preferred embodiment, the components of the aerogel include at least one of silicon-based, carbon-based, sulfur-based, metal-based and metal oxide-based components.

[0009] In another preferred embodiment, the components of the aerogel further include: a flame retardant component.

[0010] In another preferred embodiment, the flame retardant component includes at least one of a flame retardant group or a flame retardant.

[0011] In another preferred embodiment, the components of the aerogel further include: a thermally conductive component.

[0012] In another preferred embodiment, the outer diameter of the central body is 0.1 mm-20 mm, and when the central body is the tubular structure, the thickness of the tube wall of the central body is 0.05 mm-10 mm.

[0013] The utility model aims to provide a battery, which comprises the battery center tube described in any one of the above items.

[0014] Due to the adoption of the above technical scheme, the utility model has the following positive effects compared with the prior art: through the application of the utility model, an aerogel central tube structure suitable for cylindrical batteries is provided, which can effectively improve the wettability of the electrolyte in the battery and promote the infiltration rate of the electrolyte during the periodic extrusion and infiltration process, thereby ensuring the electrical performance of the battery; at the same time, after the aerogel absorbs the electrolyte, it is transformed into a liquid gel and fits tightly with the inner wall of the roll core through the swelling effect, thereby alleviating the collapse problem of the central hole; the utility model has a simple structure, is lightweight, flame retardant, and acid and alkali resistant, further improves the service life of the central tube, and can promote the infiltration of the electrolyte and the transmission of the gas generated during the operation of the battery through the porous outer wall, thereby helping to improve the cycle life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a radial schematic diagram of a battery center tube of the utility model;

[0016] Figure 2 It is an axial schematic diagram of a battery center tube of the utility model.

[0017] In the attached figure:

[0018] 1. Central body; 2. Through hole; 3. Porous structure. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0020] like Figure 1 As shown, a battery center tube of a preferred embodiment is shown, including: a center body 1, the center body 1 is arranged in the winding core of the battery, and the center body 1 is made of aerogel.

[0021] Furthermore, as a preferred embodiment, the central body 1 is provided in a tubular structure or a rod-shaped structure.

[0022] Furthermore, as a preferred embodiment, the radial cross section of the central body 1 is annular or circular.

[0023] Further, as a preferred embodiment, when the central body 1 is a tubular structure, a through hole 2 is formed in the axial direction of the central body 1. Further, the through hole 2 is arranged to penetrate the central body 1 in the axial direction.

[0024] Further, as a preferred embodiment, a porous structure 3 is formed on the outer wall of the central body 1. Further, the central body 1 made of aerogel has a porous structure 3 formed on its annular outer wall, which makes the entire central body 1 have a high porosity and a large specific surface area, thereby facilitating the infiltration and retention of the electrolyte, and facilitating the infiltration of the electrolyte and the transmission of the gas generated during the operation of the battery.

[0025] Further, as a preferred embodiment, after the central body 1 absorbs the electrolyte of the battery, the central body 1 swells and the outer diameter of the central body 1 increases. Further, preferably, before the central body 1 enters the winding core, its outer diameter is slightly smaller than the inner diameter of the winding core, and after being soaked in the electrolyte, the central body 1 swells until its outer diameter is completely matched with the inner diameter of the winding core.

[0026] Furthermore, as a preferred embodiment, the outer wall of the central body 1 fits with the inner wall of the winding core.

[0027] Further, as a preferred embodiment, the components of the aerogel include at least one of silicon, carbon, sulfur, metal and metal oxide. Preferably, the central tube is made of SiO2 aerogel.

[0028] Furthermore, as a preferred embodiment, the components of the aerogel further include: a flame retardant component. Furthermore, the flame retardant capability of the central tube is improved by introducing the flame retardant component.

[0029] Further, as a preferred embodiment, the flame retardant component includes at least one of: a flame retardant group or a flame retardant. Further, a corresponding flame retardant component is dispersed inside the aerogel, and the flame retardant is preferably an aluminum hydroxide flame retardant, or the flame retardant group releases non-flammable CO2, or N2, or H2O when thermally decomposed, thereby giving the central tube additional flame retardant properties.

[0030] Furthermore, as a preferred embodiment, the components of the aerogel also include: a heat-conducting component. Furthermore, the introduction of the heat-conducting component promotes the internal heat conduction capacity of the central tube.

[0031] In a further embodiment of the present invention, the outer diameter of the central body 1 is 0.1 mm-20 mm, and when the central body 1 is a tubular structure, the wall thickness of the central body 1 is 0.05 mm-10 mm. Figure 2 As shown, the outer diameter of the central body 1 is 4 mm and the wall thickness is 1 mm.

[0032] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention.

[0033] The utility model also has the following implementation methods based on the above:

[0034] A battery in a preferred embodiment comprises the battery center tube as described in any one of the above.

[0035] Furthermore, when the central tube of the battery is actually used, after the central body 1 is placed inside the roll core of the battery, as the electrolyte infiltrates, the gaseous pores inside the aerogel are gradually replaced by the electrolyte, thereby transforming into a liquid gel. Due to the swelling effect after absorbing the liquid, the outer wall of the central body 1 will fully fit the inner wall of the roll core.

[0036] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery center tube, characterized in that: include: The central body is arranged in the winding core of the battery, and the central body is an aerogel structure.

2. The battery center tube according to claim 1, characterized in that: The central body is arranged in a tubular structure or a rod-shaped structure.

3. The battery center tube according to claim 1, characterized in that: A porous structure is formed on the outer wall of the central body.

4. The battery center tube according to claim 1, characterized in that: The outer wall of the central body is in contact with the inner wall of the winding core.

5. The battery center tube according to claim 2, characterized in that: The outer diameter of the central body is 0.1 mm-20 mm, and when the central body is the tubular structure, the thickness of the tube wall of the central body is 0.05 mm-10 mm.

6. A battery, characterized in that: The battery center tube comprises the battery center tube as described in any one of claims 1 to 5.

Images