KR-20260065768-A - busbar using shrinkage of insulating material capable of forming char layer, and manufacturing method thereof

KR20260065768AKR 20260065768 AKR20260065768 AKR 20260065768AKR-20260065768-A

Abstract

The present invention relates to a busbar utilizing the shrinkage of an insulating material capable of forming a char layer and a method for manufacturing the same. More specifically, the invention relates to a busbar utilizing the shrinkage of an insulating material capable of forming a char layer and a method for manufacturing the same, which can suppress fire spread through the formation of a char layer and can rapidly and high-quality insulate busbars of various shapes through the expansion and contraction of the insulating material. In addition, the method is characterized by comprising a preparation step for manufacturing a hollow insulating material including expanded graphite and silicon, an expansion step for expanding the insulating material produced through the preparation step by impregnating it with a solvent to expand the insulating material, a placement step for inserting a bus bar into the insulating material expanded through the expansion step, and a shrinking step for shrinking the insulating material so that it adheres closely to the bus bar inserted through the placement step.

Inventors

윤경섭

Assignees

실리콘밸리(주)

Dates

Publication Date: 20260511
Application Date: 20260416

Claims (6)

A preparation step for manufacturing a hollow insulating material comprising expanded graphite and silicon; An expansion step in which the insulating material manufactured through the above preparation step is impregnated with a solvent to expand the insulating material so that it expands; A placement step of inserting a bus bar into the insulating material expanded through the above expansion step; Characterized by including a shrinking step for shrinking the insulating material so that the insulating material adheres closely to the busbar inserted through the above placement step. A method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer.
A preparation step for manufacturing a hollow insulating material comprising expanded graphite and silicon; An expansion step in which the insulating material manufactured through the above preparation step is impregnated with a solvent to expand the insulating material so that it expands; A placement step of inserting a bus bar into the insulating material expanded through the above expansion step; It includes a shrinking step for shrinking the insulating material so that the insulating material adheres to the busbar inserted through the above placement step, and The insulating material manufactured through the above preparation step is composed of 80-99 wt% of a mixture consisting of 1-60 wt% expanded graphite and 40-99 wt% silicon, and 1-20 wt% of a non-combustible additive, wherein The above-mentioned non-combustible additive comprises at least one of needle-shaped carbon fiber chops and silica chops, and By manufacturing by extruding the needle-shaped non-combustible additive so that it is oriented along the length direction of the insulating material, Oriented needle-shaped non-combustible additives suppress changes in the length of the insulating material during the expansion and contraction phases, and The above expansion step is Characterized by being carried out using a single solvent composed of either methyl isobutyl ketone (MIBK) or toluene so as not to change specific gravity or concentration even with repeated impregnation of the insulating material. A method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer.
In Paragraph 2, The above shrinkage step is By heating to a temperature of 30~150℃ to volatilize the solvent impregnated in the insulating material, Characterized by the insulating material, which has expanded due to swelling caused by a solvent, shrinking and adhering to the busbar. A method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer.
In Paragraph 2, Between the above preparation and expansion stages Characterized by further including a busbar preparation step of manufacturing a busbar by inserting a copper rod into a hollow aluminum tube expanded by heating and then cooling. A method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer.
In Paragraph 2, Between the above preparation and expansion stages Characterized by further including a processing step of bending the busbar into a predetermined shape. A method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer.
A busbar manufactured using a method utilizing the shrinkage of an insulating material capable of forming a char layer according to any one of claims 2 to 5, characterized in that expanded graphite expands at a temperature of 200°C or higher to form a char layer on the surface. Busbar utilizing the shrinkage of an insulating material capable of forming a char layer.

Description

Busbar using shrinkage of insulating material capable of forming a char layer and manufacturing method thereof The present invention relates to a busbar utilizing the shrinkage of an insulating material capable of forming a char layer and a method for manufacturing the same. More specifically, the invention relates to a busbar utilizing the shrinkage of an insulating material capable of forming a char layer and a method for manufacturing the same, which can suppress fire spread through the formation of a char layer and can rapidly and high-quality insulate busbars of various shapes through the expansion and contraction of the insulating material. As technology development and demand for mobile devices such as mobile phones, laptops, camcorders, and digital cameras increase, technology related to rechargeable secondary batteries is becoming more active. Furthermore, as secondary batteries serve as an alternative energy source to fossil fuels that cause air pollutants and are being applied to electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs), the need for secondary battery development is steadily increasing. Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as the ability to charge and discharge freely with almost no memory effect compared to nickel-based batteries, a very low self-discharge rate, and high energy density. Meanwhile, secondary batteries used in small devices consist of several battery cells, whereas battery modules in which multiple battery cells are electrically connected are used in vehicles and the like. In these battery modules, multiple battery cells are connected in series and parallel to improve capacity and output, and a busbar is used for electrical connection between these battery cells. These busbars are widely used not only for connecting battery cells in series or parallel, but also for connecting various electronic devices, and are particularly applied to complex paths that are narrow or winding. As a method for insulating a curved busbar, a method of coating by applying an insulating resin, as described in Korean Patent Publication No. 10-2021-0053531 "Flexible Busbar and Method for Manufacturing the Same," was developed; however, there was a problem in that it was difficult to maintain the insulation state due to cracking or breaking upon impact. Accordingly, an insulation coating method using a shrink tube was developed as described in Korean Registered Patent No. 10-2136556, "Flexible busbar using room temperature shrink tube and method for manufacturing the same," but There was a problem with the Aqueous System, which expands by immersing in a solution of water and expansion agent for a set period of time, where the concentration of the expansion agent varied with repeated use, requiring the expansion agent to be prepared separately according to the measured weight of the shrink tube. In particular, as shown in FIG. 7, there was a problem in that it was difficult to position the insulation covering correctly when the shrink tube (30) expanded and contracted (L1, L2) in the longitudinal direction and was in close contact with the bus bar (11). In particular, when the shrink tube (30) expands and contracts in the longitudinal direction, there was a problem in that the contracted lengths (L1, L2) on both sides differed more significantly depending on the bent shape of the bus bar (11). FIG. 1 is a flowchart illustrating, in sequence, a method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 2 is a diagram illustrating the preparation step of a method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 3 is a diagram illustrating the expansion step of a method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 4 is a diagram illustrating the expansion step of a method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 5 is a diagram illustrating the shrinkage step of a method for manufacturing a busbar using shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 6 is a drawing illustrating another embodiment of a method for manufacturing a busbar using the shrinkage of an insulating material capable of forming a char layer according to the present invention. FIG. 7 is a drawing illustrating the shrinkage of an insulating material according to the prior art. Specific structural or functional descriptions of embodiments according to the conc