The article will likely be invaluable for Electrical Car (EV) battery producers in addition to battery module and pack designers to assist select the proper thermal interface materials for battery pack wants. Two-component (2K) hole fillers present clients with quite a lot of thermal conductivities and chemistries to select from, which give excessive dispense charges, dependable treatment efficiency, and desired electrical properties. A noticeable rise in curiosity has been noticed to cut back manufacturing complexity that comes with utilizing 2K hole fillers. To handle that want, the place two-component mixing will not be most popular by the end-user, a brand new isocyanate-free and non-silicone one-component (1K) hole filler has been developed by Parker LORD. 1K hole fillers assist EV OEMs by lowering manufacturing and operational complexity. The brand new 1K answer is a low-density hole filler with glorious move properties and low battery insertion stress.
A comparative evaluation was carried out by Parker LORD scientists to check the benefits and trade-offs between 2K and 1K hole fillers. For a particular thermal conductivity hole filler, the comparability between 1K and 2K focuses on end-use properties of hole fillers comparable to density, move traits, battery insertion stress, treatment habits, and environmental ageing efficiency. As said earlier, the 1K hole filler helps to cut back manufacturing complexity with a trade-off of dependable treatment velocity {that a} 2K hole filler provides. As well as, the variability within the 2K hole filler chemistries provides a wider vary of flexibility in designing a product to fulfill difficult manufacturing and design necessities.
Thermal administration of an EV battery pack is carried out by a liquid-cooled metallic plate generally known as a cooling plate. The warmth switch from a battery to the cooling plate is aided by a skinny layer of Thermal Interface Materials (TIM), additionally known as a spot filler, that gives an environment friendly thermal pathway between the battery pack and the cooling plate. Parker LORD has been very receptive to OEMs’ necessities to develop tailor-made customized TIM options that come up from delicate variations in battery pack designs. The latest growth of a newly formulated cell-to-pack thermal adhesive is a good instance of such buyer want responsiveness.
Some battery pack producers started through the use of a thermally conductive hole pad. Nevertheless, they don’t present efficient warmth switch and aren’t excellent for mass manufacturing. As manufacturing charges elevated, the business shifted to liquid-dispensed hole fillers, the place the 2K hole fillers at the moment are broadly most popular. One difficult side of utilizing a spot filler is the reworkability of battery modules, which has been consistently addressed with improved design and next-generation hole fillers. Because the business is optimizing battery pack designs to enhance thermal administration, there may be a further push to extend the manufacturing throughput and cut back complexities that come up from utilizing a 2K hole filler.
Tradeoffs Between 1k and 2k Hole Fillers
The principle sources of complexities come up in the course of the software technique of 2K hole fillers. The illustration in Determine 1 highlights the sources of complexities. First, a exact management is required in meting out the 2 elements to make sure that the ultimate combine is on the optimum ratio, in any other case, materials efficiency will be compromised. Second, no want for mixing components in 1K permits for decrease strain to dispense the fabric on the identical move charge as in 2K. Moreover, no mixing components in 1K additionally eases materials software in space-constricted corners and edges, the place it may be troublesome for a 2K hole filler to use as a result of a protracted mixing nozzle. Moreover, the dispense system necessities for 2K hole fillers, comparable to pumps and shot meters, are twice as a lot as for 1K hole fillers and can improve preliminary capital funding.
These manufacturing and operational complexities will be addressed by a one-component hole filler. Nevertheless, the manufacturing ease of 1K hole filler comes with a number of trade-offs as depicted qualitatively on a slider chart in Determine 2.
The most important trade-off is the dependence of 1K hole filler chemistry on not solely environmental situations for its treatment efficiency but in addition on the bondline geometry, whereas the treatment efficiency of a lot of the 2K hole filler chemistries is much less depending on environmental situations and by no means depending on bondline geometry. Whereas a 2K hole filler gives a formulator with a number of approaches to tune its treatment velocity, a 1K hole filler has restricted knobs in its toolbox to do the identical. Moreover, chemistry choice variety and market availability of 1K hole fillers are restricted.
Hole Fillers for Thermal Administration
There may be quite a lot of 1K TIMs accessible available in the market which can be known as thermal grease, thermal paste, or thermal compound. They’re largely thermoplastic or pre-gelled TIMs. Parker LORD itself has an in depth portfolio of such thermal greases. For extra data try our e-book discussing thermal administration for electronics.
For the aim of this white paper, a 1K hole filler is outlined as a thermally conductive thermoset. Parker LORD has developed a 1K hole filler from a modified silane (MS-polymer) chemistry referred to hereon as MS-1K. This prototype has no risky silicones and unsafe isocyanates. It’s a low density (2.0 g/cc) hole filler with a thermal conductivity of two.0 W/m·Okay. Within the examine, a complete comparability is carried out between 2K and 1K hole fillers chosen from Parker LORD’s CoolTherm® portfolio, with a aim to help OEMs and battery pack designers in making an knowledgeable determination when selecting the kind of hole filler for his or her battery pack designs.
Selecting Between 1k and 2k Hole Fillers
With the information offered, it’s evident that each 2K and 1K hole fillers have their very own benefits and limitations. The selection primarily relies on the particular wants of the battery pack design and the manufacturing course of. If simplifying manufacturing complexity is the first aim and the method can deal with environmental dependent treatment, then a 1K hole filler could also be a sensible choice. A 2K hole filler is a more sensible choice if the fabric treatment velocity is the precedence. Even with their manufacturing complexities, the treatment velocity of a 2K hole filler doesn’t depend upon bondline geometry and is way much less depending on environmental situations. The number of 2K hole filler chemistries additionally provides a wider vary of flexibility in designing a product to fulfill difficult manufacturing and design necessities. Click on right here to view the complete whitepaper which accommodates information and full take a look at outcomes evaluating 1k and 2k hole fillers.
Enabling Engineering Breakthroughs
At Parker LORD, they perceive that EVs are the longer term. That’s why they infuse high-performance thermal interface supplies with world-class service and help. Their consultants are extremely responsive and specialised in customized formulations in a number of chemistries to fulfill your efficiency, value, and schedule targets. In case you have a particular query or wish to study extra, attain out to a member of their crew in the present day.
