Confluence and heat conduction integrated device of lithium battery protection board MOS switch

Abstract

The invention provides a confluence and heat conduction integrated device of a lithium battery protection board MOS switch. The device comprises a PCB on which tinned copper foils are arranged, and is characterized in that components and confluence pieces are also arranged on the tinned copper foils, pins of the components are welded on the wiring surfaces of different tinned copper foils, and the confluence pieces are fixedly connected with the PCB; a heat dissipation aluminum plate is further arranged and is arranged at the sides, away from the PCB, of the confluence pieces. The confluence and heat conduction integrated device of the lithium battery protection board MOS switch has the beneficial effects that the heat conduction efficiency is improved, and the heat dissipation capability of the lithium battery protection plate is improved; the common PCB is used for replacing an existing heat dissipation mode through an aluminum-based PCB, so that the cost is reduced.

Description

technical field [0001] The invention belongs to the field of heat dissipation structure of a protection board, and in particular relates to a confluence and heat conduction integrated device of a MOS switch of a lithium battery protection board. Background technique [0002] In the circuit design of small and medium power power conversion / static electronic switches, the copper foil cross-sectional area of ​​the PCB is insufficient to pass a large current. Generally, measures such as stacking tin on the copper strip, adding soldering copper wires, and copper busbars are used to increase the power. The cross-sectional area of ​​the current channel of the circuit reduces the impedance of the power circuit, reduces power loss, improves efficiency, and also reduces heat generation, which is beneficial to the heat dissipation design of the product. [0003] The MOS tube in the power circuit is the main heat source. The plug-in MOS tube can be fixed on the radiator through the heat...

AI Technical Summary

Problems solved by technology

[0003] The MOS tube in the power circuit is the main heat source. The plug-in MOS tube can be fixed on the radiator through the heat-conducting silicone insulating sheet, and the heat is efficiently conducted from the metal sheet on the back of the MOS tube to the radiator; the surface mount MOS tube The metal sheet on the back of the tube is welded on the PCB, and the heat sink can only be bonded to the plastic on the front of the MOS tube. The contact surface is coated with a layer of thermally conductive silicone grease / thermally conductive silicone / thermally conductive silicone insulating sheet, which has a small heat dissipation contact surface and high heat dissipation efficiency. Low, the reliability of the MOS tube is reduced

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