Simply when it appeared that the battle of the EV battery was over, and that China had received, a little-known American tech firm mentioned: “Maintain on, not so quick. We even have a recreation changer, a brand new type of battery that’s higher in any respect the parameters EV batteries at the moment are ranked”. This battery will give an EV 50 p.c extra vary than any comparable battery, value much less to provide, scale back the danger of fires, will be made in virtually any form, and will be mass-produced within the manufacturing facility that makes EVs.
This revolutionary battery is named ETOP (electrode-to-pack), and it’s made by 24M Applied sciences, a Cambridge, Massachusetts-based firm. 24M’s battery expertise has attracted consideration and investments by the likes of Volkswagen because the early 2020s, and the ETOP battery is the fruits of a number of of the corporate’s tech breakthroughs used collectively.
How The ETOP Battery Compares To A Conventional Pack
The electrode-to-pack system creates a sealed anode/cathode pair that’s built-in instantly into the battery pack. This eliminates the necessity for particular person cells, modules, and heavy non-energy-carrying supplies. It achieves the best vitality density as a result of the next proportion of the battery is made up of electrodes and different supplies, the energy-carrying parts.
ETOPs Versus Conventional Battery Packs
Conventional battery packs seem like cans of soda in a field. Every cell is wrapped and guarded by a metallic casing, and these are grouped into modules, that are mounted right into a pack. As a result of every cell has a spherical diameter, there’s lots of wasted house in every module, whereas the person cell’s metallic wrap is sort of heavy and carries no vitality.
Whereas every EV cell by itself is sort of small, the quantity wanted in a present EV is mind-boggling. The Tesla Mannequin S with the 100 kWh pack makes use of 8,256 cells, for instance. This fashion of packing vitality makes use of lots of lifeless house, which implies the electrodes make up between 30 and 60 p.c of the battery’s quantity.
What Manufacturing ETOP Entails
An EV battery is manufactured from an anode (damaging electrode — usually graphite), a cathode (constructive electrode — a metallic oxide), and a separator between them, with an electrolyte resolution that permits motion between these electrodes. In contrast to regular EV cells, the ETOP seems like layers of cloth laid atop one another, the 2 electrodes, and the separator. These are mounted on a sheet of polymer that may be reduce to measurement or form wanted, and encased in plastic. This electrode-to-pack permits for 80 p.c of the pack’s quantity to be energetic vitality materials, in contrast to the utmost 60 p.c achievable with normal cells. These packs can then be layered on prime of one another, both in collection or in parallel, in a really compact pack.
The Advantages Of Utilizing An ETOP Battery
Apart from the advantages of upper vitality density, the character of ETOP additionally means the EV can journey as much as 50 p.c additional per quantity of battery house used. The battery storage space will be additional optimized as a result of an ETOP pack doesn’t should be sq. or rectangular like regular battery packs, however will be reduce to suit round curves or structural angles within the chassis of the automotive.
Hearth Hazards Are A Actual EV Concern
One of many dangers of EV batteries is hearth, though the danger is getting much less over time. However as battery makers are searching for better effectivity, the overlap within the layer of anode and cathode is decreased, which does enhance the danger of fireplace if the battery is broken throughout an accident or by the formation of dendrites over time.
ETOP makes use of a semi-solid electrolyte, which is less complicated to fabricate than the solid-state batteries we might even see within the close to future. In contrast to the liquid electrolytes utilized in all different EV batteries, the semi-solid electrolyte can also be far much less flammable. These semi-solid batteries may also last more by means of repeated cost/discharge cycles, which implies the battery will degrade much less because the automobile will get older. As a result of they aren’t actually affected by warmth, they’re higher capable of face up to actually quick charging.
The ETOP Combats Dendrite Formation
Dendrites are metallic constructions, formed like tiny bushes, that develop on the anode throughout charging. These can ultimately pierce the battery’s separator, inflicting decreased battery efficiency, and might result in overheating, failure of the battery, hearth, or explosions. The separator within the ETOP is manufactured from one other materials patented by 24M Applied sciences, which blocks the dendrites and causes them to unfold horizontally, the place they may ultimately be reabsorbed by the supplies within the separator.
Versatile Energy Opens The Door To Infinite Potentialities
One other means of creating a battery cell is rolling up the electrodes and flattening them in a container. Such a can cell will attain 4.6V. If 11 ETOP cells are stacked on prime of one another, with every cell flipped alternately, every can will present 48V by wiring them in collection. As a result of these cells will be flipped, collection and parallel connections will be made. This offers flexibility, permitting compact 400 to 800V batteries.
Chemistry Agnostic Will increase Manufacturing Viability
Lithium-ion batteries are well-known in EVs, however battery makers depend on a number of completely different chemistries to attain completely different outcomes. Some are cheaper, however supply much less vitality density, whereas others are extra environment friendly, however the supplies used will be costly and include the bags of doubtful mining sources. The primary battery chemistries are:
- Lithium Nickel Manganese Cobalt gives excessive vitality density, however excessive value and moral issues in mining strategies.
- Lithium Iron Phosphate with low value, lengthy life, however low vitality density and better weight.
- Lithium Nickel Cobalt Aluminum Oxide provides excessive vitality and an extended lifespan, however excessive value and moral issues.
- Sodium-ion batteries are low cost, however not but absolutely developed, and presently lack density.
ETOP batteries are agnostic within the chemistry they’ll use, with the cathode utilizing any of the chemistries described above.
Quite a few Manufacturing Benefits
Carmakers can combine an ETOP manufacturing module into their pack meeting line. To make a battery cell, the producer cuts the prefabricated anode and cathode materials into the specified measurement and form, utilizing the chemistry of their selection. Each electrodes have a plastic backing, which shall be used to seal the cell as soon as the 2 electrodes have been sandwiched collectively.
After being reduce to measurement, every layer is sprayed with a semi-solid electrolyte, and a separator is rolled onto the anode. The cathode, which has additionally been sprayed with the electrolyte, is positioned on prime, forming the electrode sandwich. The plastic movies backing the anode and cathode are sealed collectively, locking the separator in place.
Manufacturing Occurs On A Single Machine
All these steps occur on a single machine. The sealed electrodes are then inserted right into a pack, the place the packs can go instantly onto the meeting line. This offers producers a option to construct compact, high-voltage batteries at a low value, and it’s a means that may be built-in into the manufacturing course of.
If ETOP works as marketed, it may possibly jumpstart US EV battery manufacturing and permit it to compete instantly with the dominant Chinese language. There’s, nevertheless, a spot between promise and profitable software, and the EV battery trade in the remainder of the world has progressed in nice leaps.
The EV Battery Image In 2025
The 800-pound gorilla within the room is the Chinese language EV battery trade. China’s automotive market is double the dimensions of the US, and EVs make up about half of gross sales in that nation. The success of Chinese language EVs relies on their dominance of the EV battery market, the place CATL and BYD are absolute market leaders.
This dominance has been many years within the making, with huge authorities help, scale of manufacturing, possession of all sides of the provision chain, and the power to develop new EVs in document time. Chinese language companies BYD and CATL have acknowledged the worth of LFP expertise and have discovered modern methods to beat the drawbacks of this chemistry.
All just isn’t effectively within the Chinese language EV house, nevertheless. There are over 200 EV firms, with as many failing as beginning up on a regular basis. There’s a huge worth struggle amongst producers, which has reduce the earnings of even the main gamers. Globally, Chinese language EVs are seen as excellent worth for cash, but additionally as a risk to native automotive industries, and are topic to tariffs. However the Chinese language benefit is simple, and even Ford is utilizing CATL expertise below licence in its new US battery vegetation.
Stable State Science Is Advancing
Stable-state batteries have been the nirvana of EVs for over ten years. This troublesome expertise is lastly coming to fruition, with each Toyota and Nissan on the verge of mass manufacturing, though the way forward for Nissan in the intervening time is bleak. A Merc EQS with an experimental solid-state battery just lately drove 748 miles on a single cost, with some miles left within the battery. The vary of non-solid state batteries can also be rising quickly, with the variety of fashions breaking the 500-mile barrier rising on a regular basis.
Conventional Battery Prices Plummeting
The foremost impediment to the adoption of recent expertise like ETOP is that the price of confirmed battery expertise is plummeting. Battery costs have dropped by over 90 p.c prior to now 15 years, and the 2023 worth is predicted to drop by 50 p.c by 2026. At $80 per kWh, this may quickly drop under the price of making a gasoline automotive, which can imply the tip of gasoline automobiles. The issue 24M Applied sciences faces just isn’t that it doesn’t have an excellent product, however relatively that the danger of shifting to such expertise shall be better than the reward in a world the place batteries are getting cheaper and higher anyway.
Sources: 24M
