Electrical heating automobile laminated glass with a shunt bus

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

[0013]1. Unreasonable setting of the power connector will cause hot spots;

[0014] Patent CN02824670.5 mentions that in the prior art, generally, the compound of conductor silver including tin type is used, and sometimes metal film strips are also used to realize the glass "big head" ” position or the effect of heating the heating zone at the static position of the wiper, but for the situation that the number of joints of the automobile glass is generally less than 4, in the patent CN02824670. Many; although it is mentioned in the patent that "in many cases, one of the two auxiliary bus bars with the same pole as the lower bus bar may not be connected to the power supply", but its premise is that "the voltage loss along the bus bar does not exceed A limited value”; In practice, we found that using the vehicle voltage 14V to achieve the ideal heating effect, the film surface resistance should be less than 1 ohm / □, and the bus resistance is usually not much different. If only one end is connected to the "connector", There will inevitably be a certain voltage loss, which will cause the heating effect to be worse the farther away from the joint position. To achieve a uniform heating effect, the lower busbar needs to be connected to at least two joints. The second busbar connected to the lower busbar needs to be connected with a joint. When the number of joints is not more than 4, the upper busbar can only be connected with one joint. If it is connected to the end of the busbar, it will produce uneven heating effect, and in Hot spots will inevitably appear at the ends connected to the joints due to excessive current concentration. CN02824670.5 does not deal with the end of the second busbar in the heating zone of the wiper rest position. It is located in the film layer of the wiper rest position heating zone. Hot spots also occur at the ends

[0015]2. The layout of lead wires is unreasonable, and there is a problem of uneven heating;

[0016] 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 its It is simply drawn out through a lead wire and then connected to the connector. The current travel path is different, which 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

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