{"id":79598,"date":"2023-10-30T10:46:26","date_gmt":"2023-10-30T01:16:26","guid":{"rendered":"https:\/\/www.solarquotes.com.au\/blog\/?p=79598"},"modified":"2023-10-30T10:48:48","modified_gmt":"2023-10-30T01:18:48","slug":"battery-tech-amprius-dominates","status":"publish","type":"post","link":"https:\/\/www.solarquotes.com.au\/blog\/battery-tech-amprius-dominates\/","title":{"rendered":"Cutting-Edge Batteries From Amprius Dominate The World Solar Challenge"},"content":{"rendered":"<div id=\"attachment_79626\" style=\"width: 1210px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-79626\" class=\"wp-image-79626 size-full\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/battery-amprius.jpg\" alt=\"amprius battery pack in solar car\" width=\"1200\" height=\"628\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/battery-amprius.jpg 1200w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/battery-amprius-300x157.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/battery-amprius-1024x536.jpg 1024w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/battery-amprius-768x402.jpg 768w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><p id=\"caption-attachment-79626\" class=\"wp-caption-text\">The Amprius battery pack in the third-placed Brunel &#8216;Nuna 12&#8217; solar race car.<\/p><\/div>\n<p>The Bridgestone World Solar Challenge is not just a race. It&#8217;s a tough test for solar-powered cars, travelling a 3,000-kilometre stretch from Darwin to Adelaide. Every year, this race shows off the latest and best in solar, battery and EV technology.<!--more--><\/p>\n<p>This year, something special happened. The only four cars with batteries from Silicon Valley battery startup Amprius snagged the top four spots. This makes me wonder: Did this battery tech give the teams an unfair advantage or did Amprius savvily choose to work with only the top teams. Or was it a bit of both?<\/p>\n<div id=\"attachment_79616\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-79616\" class=\"wp-image-79616 size-full\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-side.jpg\" alt=\"winning car\" width=\"900\" height=\"450\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-side.jpg 900w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-side-300x150.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-side-768x384.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><p id=\"caption-attachment-79616\" class=\"wp-caption-text\">The winning car from Belgian Solar Team, Innoptus, covered the 3000 km from Darwin to Adelaide with an incredible average speed of 88 kph and an Amprius battery pack inside.<\/p><\/div>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-79631\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-front.jpg\" alt=\"front view of the winning car\" width=\"622\" height=\"994\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-front.jpg 622w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-front-188x300.jpg 188w\" sizes=\"(max-width: 622px) 100vw, 622px\" \/><\/p>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-79632\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-back.jpg\" alt=\"rear view of winning innoptus car\" width=\"900\" height=\"628\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-back.jpg 900w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-back-300x209.jpg 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/innoptus-back-768x536.jpg 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><\/p>\n<h2>Rules, Rules, and More Rules<\/h2>\n<p>The <a href=\"https:\/\/worldsolarchallenge.org\/files\/2268_2023_bwsc_regulations_release_version_2_published_24_02_2023_final.pdf\">race has strict rules<\/a> about energy storage to make sure it&#8217;s a fair and real test for new technologies. There&#8217;s a lot of detail in these rules, covering everything from the type and weight of the\u00a0batteries to how they operate. For example, there&#8217;s a rule that solar cars can only have 20kg of Li-ion, or in Amprius&#8217; case, Li-Polymer cells.<\/p>\n<p><a href=\"https:\/\/cosmosmagazine.com\/technology\/the-innovation-that-has-emerged-from-the-world-solar-car-challenge\/\">Cosmos Magazine<\/a> quotes the event\u2019s long-serving director Chris Selwood:<\/p>\n<blockquote><p>\u201cOur regulations define the battery storage limits on the electrochemical compound. With this new [Amprius] technology that we\u2019ve got out of Silicon Valley, it\u2019s quite clear that the electrochemical compound falls within the regulations. The fact that there\u2019s about 30% more [specific energy], because of the nanotechnology they\u2019ve employed in the construction came as a surprise, and as a delight to those that were able to get hold of it\u201d\u200b<\/p><\/blockquote>\n<h2>Let\u2019s Talk Numbers<\/h2>\n<p>Amprius touts a remarkable 450 Wh\/kg specific energy for their pouch batteries:<\/p>\n<div id=\"attachment_79629\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-79629\" class=\"size-full wp-image-79629\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/specs-amprius.png\" alt=\"amprius pouch cell specs\" width=\"900\" height=\"523\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/specs-amprius.png 900w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/specs-amprius-300x174.png 300w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/specs-amprius-768x446.png 768w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><p id=\"caption-attachment-79629\" class=\"wp-caption-text\"><em>Image: Amprius<\/em><\/p><\/div>\n<p>The air-cooled battery packs in the cars, according to the teams I talked to, had a capacity of 8 kWh. Given the 20kg weight limit for battery packs, this indicates a specific energy closer to 400 Wh\/kg. For comparison, Tesla\u2019s top battery pack is estimated at around 290 Wh\/kg.<\/p>\n<blockquote><p><strong>A note on Energy Density vs Specific Energy of Batteries<\/strong> (from <a href=\"https:\/\/www.solarquotes.com.au\/glossary.html\">The SolarQuotes Glossary<\/a>):<\/p>\n<p>&nbsp;<\/p>\n<p>The higher the energy density of a battery the more energy it has per litre of volume. This is different from specific energy which refers to energy per kilogram. The higher the energy density the less space a battery will take up per kilowatt-hour. And the higher the specific energy the less a battery will weigh per kilowatt-hour.<\/p><\/blockquote>\n<h2>A Bit About Amprius Technologies<\/h2>\n<p><a href=\"https:\/\/amprius.com\">Amprius Technologies<\/a> started in 2008 and based in California (over the road from the Tesla factory), is all about making better batteries with silicon anodes that store more energy per kg compared to the usual graphite anodes, and can charge and discharge faster.<\/p>\n<p>The limiting factor of this technology appears to be cycle life with Amprius only claiming &#8216;hundreds of cycles&#8217; with the current tech:<\/p>\n<div id=\"attachment_79630\" style=\"width: 503px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" aria-describedby=\"caption-attachment-79630\" class=\"size-full wp-image-79630\" src=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/cycles-amprius.png\" alt=\"amprius claims\" width=\"493\" height=\"260\" srcset=\"https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/cycles-amprius.png 493w, https:\/\/www.solarquotes.com.au\/blog\/wp-content\/uploads\/2023\/10\/cycles-amprius-300x158.png 300w\" sizes=\"(max-width: 493px) 100vw, 493px\" \/><p id=\"caption-attachment-79630\" class=\"wp-caption-text\">From the Amprius website<\/p><\/div>\n<h2>What This Could Mean for EV Range<\/h2>\n<p>If Amprius can improve the cycle life of these batteries from &#8216;hundreds of cycles&#8217;, and if, for example, Tesla gets to use them, their cars could realistically see a 30% boost in range. The Tesla Model 3 Long Range could get a step change from 629 km to 817 km per charge<sup class='endnote'><a href='https:\/\/www.solarquotes.com.au\/blog\/battery-tech-amprius-dominates\/#en-79598-1' id='enref-79598-1' onclick='return hhEndnotes_show(79598)'>1<\/a><\/sup>. That\u2019s pretty exciting.<\/p>\n<p>I wonder how many teams will choose Amprius batteries in the 2025 race.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Bridgestone World Solar Challenge is not just a race. It&#8217;s a tough test for solar-powered cars, travelling a 3,000-kilometre stretch from Darwin to Adelaide. Every year, this race shows off the latest and best in solar, battery and EV technology.<\/p>\n","protected":false},"author":1,"featured_media":79626,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[684],"tags":[],"class_list":["post-79598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electric-vehicles","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Amprius&#039; Cutting-Edge Batteries Dominate World Solar Challenge<\/title>\n<meta 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