Electrically heated automotive laminated glass with shunt busbar

Abstract

The invention provides electrical heating automobile laminated glass with a shunt bus. A shunt bus (7) and a shunt auxiliary bus (8) are located in an edge film-removal non-conductive area (4). The two ends of the shunt bus (7) are electrically connected with an upper bus (3.1) and the shunt auxiliary bus (8) is electrically connected with the shunt bus (7). A first auxiliary bus (6.1), a second auxiliary bus (6.2) and a third auxiliary bus (6.3) are distributed in an electro-thermal film layer of a heating area of a rest position a windscreen wiper. The first auxiliary bus (6.1) and the third auxiliary bus (6.3) are electrically connected with a lower bus (3.2). Through symmetrical design, the effect of uniform heating is achieved; the problem of hot spots of ends of buses in the prior art is solved; the problem of hot spots caused by excessive current resulting from converging on the buses is solved; without increasing the number of connectors, the problem of hot spots in a heating area of a rest position of a windscreen wiper is solved.

Description

technical field [0001] The invention relates to the technical field of electric heating of automobile glass, in particular to electrically heated automobile laminated glass with a shunt bus. Background technique [0002] The invention relates to a laminated glass, in particular to windshield glass, side window glass, rear glass and skylight glass of vehicles. This type of glass consists of a single pane of window glass bonded to another single pane of glass with a clear plastic such as polyvinyl butyral (PVB). [0003] At present, there are roughly two heating methods on the market for the front glass of automobiles: [0004] 1. Print the silver-containing conductive solution (hereinafter referred to as "silver paste") on the glass by screen printing and then bake it. Use welding or pasting to make electrical connections, and connect the positive and negative poles of the power supply to allow the current to pass through. To achieve the effect of heating. It is known that...

AI Technical Summary

Problems solved by technology

[0011] Defects of existing technology: unreasonable setting of power connectors will cause hot spots

[0012] Patent CN02824670.5 mentions that in the prior art, the composite of tin-type conductor silver is generally used, and sometimes metal film strips are also used to achieve the effect of preferential heating of the heating area at the "big head" position of the glass or the static position of the wiper, but for In the case where the number of joints of automobile glass is generally less than 4, in the patent CN02824670.5, the number of electrode settings (hereinafter referred to as "power joints") is too large; although the patent mentions that "in many cases, two One of the auxiliary bus bars of the same pole as the lower bus bar may not be connected to the power supply", but the premise is that "the voltage loss along this bus bar does not exceed a limited value"; in practice we found that using the on-board voltage 14V to achieve the ideal heating effect, the surface resistance of the film should be less than 1 ohm / □, and the resistance of the bus bar is usually not much different. If only one end is connected to the "connector", there will inevitably be a certain voltage loss, which will lead to disconnection from the connector. The farther the position is, the worse the heating effect is. To achieve a uniform heating effect, the lower busbar needs to be connected to at least two joints. At the same time, the second busbar not connected to the lower busbar in the heating area at the rest position of the wiper needs to be connected to a joint. When the number of joints does not exceed 4, only one joint can be connected to the upper busbar. If it is connected to the end of the busbar, it will produce uneven heating effect, and it will inevitably appear at the end connected by the joint because the current is too concentrated. Hot spot, CN02824670.5 has not treated the end of the second busbar in the heating zone of the wiper static position, which is in the film layer of the heating zone of the wiper static position, and it will also generate hot spots at the end

[0013] Unreasonable layout of lead wires, there is a problem of uneven heating

[0014] Patent CN03817604.1 mentions a method of eliminating hot spots, which achieves the effect of eliminating hot spots by extending the end of the busbar to the film removal area, but it is simply drawn out through a lead wire, and then connected to the joint, the current Different walking paths will cause uneven heating

And the patent does not mention how to solve the problem of local hot spots in the heating area of ​​the wiper at rest position

Images