<story><title>Toyota plans to be the first company to sell an EV with a solid-state battery</title><url>https://asia.nikkei.com/content/4c8b11d1c65d83d23ba9aeb11030a947</url></story><parent_chain><item><author>conk</author><text>I don’t see how any car battery charges in 10 minutes. Assuming a 75 kWh battery in the car, charging in 10 minute means providing 450,000 watts for 10 minutes. At 1000V (higher than any DC charger today) would require 450 amps of current. The wire needed to provide 450A would be unmanageable for a car charger. And this is all assuming 100% efficiency, when in reality there will be various losses from charger to battery.&lt;p&gt;Battery tech aside, how does any auto maker plan to get 10 minute charge time when just getting they much power through a cable is a huge challenge.</text></item></parent_chain><comment><author>aetherspawn</author><text>Hi, engineer from an electric vehicle company here.&lt;p&gt;This is not an issue because, even if a small wire is used, the efficiency loss is not all that considerable. Energy is cheap, so liquid cooling the cables and dissipating i.e. 5% of the energy into the conductor is a straightforward trade-off.&lt;p&gt;Compare that trivially to petrol, which costs petrol (diesel) to move to petrol stations, and it&amp;#x27;s actually not that surprising.&lt;p&gt;Additionally, there has recently been a lot of investment into EV chargers with built-in batteries that charge at slower rates when a vehicle is not present, and operate independently from the grid once a vehicle is connected. This answers the obvious question about infrastructure to deliver the power required.</text></comment>
<story><title>Toyota plans to be the first company to sell an EV with a solid-state battery</title><url>https://asia.nikkei.com/content/4c8b11d1c65d83d23ba9aeb11030a947</url></story><parent_chain><item><author>conk</author><text>I don’t see how any car battery charges in 10 minutes. Assuming a 75 kWh battery in the car, charging in 10 minute means providing 450,000 watts for 10 minutes. At 1000V (higher than any DC charger today) would require 450 amps of current. The wire needed to provide 450A would be unmanageable for a car charger. And this is all assuming 100% efficiency, when in reality there will be various losses from charger to battery.&lt;p&gt;Battery tech aside, how does any auto maker plan to get 10 minute charge time when just getting they much power through a cable is a huge challenge.</text></item></parent_chain><comment><author>gpm</author><text>I&amp;#x27;m confused about why you think &lt;i&gt;the wire&lt;/i&gt; would be a challenge. I&amp;#x27;m not at all knowledgeable about high voltage&amp;#x2F;power stuff like this so maybe I&amp;#x27;m missing something?&lt;p&gt;A quick search tells me that 1000 kcmil wire is rated for 450 amps [1].&lt;p&gt;Another quick search finds that reasonably sized 1000 kcmil rated for 15000 volts  are available and reasonably sized for a vehicle charger [2].&lt;p&gt;[1] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;wiresizecalculator.net&amp;#x2F;wiresizechart.htm&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;wiresizecalculator.net&amp;#x2F;wiresizechart.htm&lt;/a&gt;&lt;p&gt;[2] (note that kcmil and mcm mean the same things) &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.lighting-gallery.net&amp;#x2F;gallery&amp;#x2F;displayimage.php?pos=-137753&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.lighting-gallery.net&amp;#x2F;gallery&amp;#x2F;displayimage.php?po...&lt;/a&gt;</text></comment>