】 In a variety of thermal plastic, here's a variety of mainly refers to the epoxy thermal plastic, silicone thermal plastic and polyurethane thermal plastic, the best overall performance is a thermal silica, was originally to meet the electronic circuit device power constantly upgraded Thermal requirements evolved. Devices with high heat generation power, if they do not dissipate heat evenly and appear hot spots, may cause fatal damage to the device.
Thermal silica typical products and parameters
Specific to the power battery system, the application forms of silicone mainly include potting and sealing glue, silicone film, silicone grease, and adhesive glue in several forms. The following lists some typical silicone product parameters below. It should be emphasized that only a few typical product parameters. However, it has not found a particularly suitable picture of the corresponding application of the power battery, and the figure of the electronic product assists understanding.
1) Thermally conductive silicone sealant
Compared with the three potting glues, the density of silicone can be the lowest. Low specific gravity, removable, is an important characteristic of thermal conductive silicone that is more suitable for power battery system applications.
Color: White, black viscous liquid; Applications: automotive electronics, modules, LED power driver module, solar module junction box, electric vehicle charging column module, lithium battery pack, capacitor group, magnetic induction coil, inverter power supply.
Epoxy resin
Color: black or white fluid; used for metal bonding, electrical product core bonding, power reactor potting, soft magnetic unit potting, high temperature sensor potting and so on.
Polyurethane
Color: Black liquid / white liquid, brown liquid / brown liquid; Application: Used in the pouring and potting of communication equipment, transformers, control power supply, ignition controller, electronic sensor, etc.
2) Thermal grease
Color: white liquid; thermal conductivity: 1.2--2.5W/mK; low settlement, storage at room temperature; application areas: power modules, integrated chips, power modules, automotive electronics, telecommunications equipment, computers and accessories.
3) Thermally conductive adhesive seal silicone
Color: white paste; reduce the mechanical stress and tension caused by mechanical, thermal shock and vibration; excellent electrical insulation, anti-corona; excellent outdoor aging, service life of up to 20-30 years; between -60-260 °C Stable mechanical and electrical properties; Applications: LED lamp seals; Automotive electronic components heat dissipation; PCB board and electronic components thermal positioning seal; High-power live parts filled with gaps.
4) Thermal silica film
Color: gray; low hardness; application: used in power modules, integrated chips, power modules, automotive electronics, telecommunications equipment, computers and other accessories.
Application of Silicone in Power Battery System
At present, the organic materials used in the thermal management interface of the vehicle can be divided into two types. One is a thermal pad and the other is a thermal conductive filler. Cylindrical, square, soft pack batteries, different types of batteries, the use of silicone heat dissipation is not the same.
Silicone wafers are easy to use, and no special equipment is required for production. However, the use of potting or silicone grease requires special equipment for gluing or injection. In the application effect, you can use the following figure to illustrate.
The softer the heat-conducting material is, the closer it is to the device having a fixed shape such as the cooled member and the heat sink, and the better the heat-conducting effect is.
1) Cylindrical power battery adhesive
(1) Potting between cells and cells
Conductive potting silicone, potting adhesive layer flexible, good damping effect, the delay of the thermal battery to play a role in delaying the spread of thermal control over the general, thermal conductivity can be adjusted, but the disadvantage is that the overall potting significantly increase the weight of the battery pack and the vehicle And increase costs. Relatively speaking, the density of silica gel is relatively low. If this type of process is used, silica gel is a good choice.
(2) Bonding and fixing of the bottom of a cylindrical battery
(3) How the silicone film wraps around the core
2) analysis of square power battery glue
For square cells, most of the silicone interface materials are used between the bottom of the square cell and the system heat sink structure to provide better contact between the cell and the heat sink structure.
(1) Battery housing bonding
(2) Connection between cells and aluminum shells
(3) Placing Silicone Sheets Between Aluminum Shells
3) analysis of soft battery power battery
Bonding between the cell and the cell:
A patent to improve the heat dissipation of cylindrical batteries using silicone
Among the three major types of batteries in cylindrical, square, and soft packs, due to the complex shape of the module, the cylindrical battery uses silicon material to dissipate heat, and the efficiency in production is reduced. Therefore, there are fewer practical cases for the application of silicone heat dissipation in cylindrical batteries. A patent recently seen just solves this problem.
In general, the intent of the patent is to mold the silicone material ahead of time for applications with complex shapes. An invention patent applied by Huayi Power in 2017 describes a method for forming a heat-conducting silicone rubber mold. The flow is as follows:
The mold diagram is as follows:
The silicone heat-conducting parts are as follows:
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