Posted on 02/16/2017 4:37:15 AM PST by sukhoi-30mki
Japan's first submarine to be powered by lithium-ion (Li-ion) batteries will be commissioned in March 2020, doing away with lead-acid batteries and a Stirling air-independent propulsion (AIP) system.
With the arrival of this eleventh Soryu-class submarine the Japan Maritime Self-Defence Force (JMSDF) will be the world's first navy to field a conventional submarine powered by Li-ion batteries.
VAdm (Retired) Masao Kobayashi, former commander of the JMSDF's Fleet Submarine Force, explained at UDT Asia in Singapore on 18 January that the new type 'will change conventional submarine operations dramatically'.
While Li-ion batteries offered similar endurance to an AIP system combined with lead-acid batteries at low speeds, Kobayashi said their advantage was found in longer endurance at higher speeds (e.g. during an approach or evasion) thanks to their higher capacity.
Furthermore, Li-ion batteries can be recharged at sea by snorkelling, which Kobayashi described as 'revolutionary', when compared with an AIP system.
They also have a shorter indiscretion time due to a high charge current, whereas lead-acid batteries take a long time to restore their electrical capacity. Additionally, Li-ion batteries have a long life, are maintenance-free, enjoy simple operation and result in a simpler power structure.
Their biggest disadvantage is monetary, however. The first Li-ion-powered Soryu-class submarine will cost JPY64.4 billion ($566 million) as opposed to JPY 51.7 billion for the preceding boat in the class. Much of this $112 million difference is due to batteries and electrical circuits.
There are three requirements to fully exploit Li-ion batteries in any submarine. They require high-power diesel engines and a generator, bigger exhaust/intake pipes, alterations to electrical circuits (especially circuit breakers) and high-power diesel engines and a generator.
As Li-ion batteries are lighter than lead-acid batteries the Soryu platform had to be redesigned slightly to maintain weight/balance.
Two Li-ion types are available: lithium nickel cobalt aluminium oxide (NCA) manufactured by GS Yuasa; and lithium-titanate (LTO) from Toshiba. The JMSDF will use NCA-type batteries whereas Kobayashi believes LTO types were offered to Australia for its Future Submarine proposal.
The retired submarine commander believes that there is no clear single lithium-ion solution as a submarine main battery, so he predicted future submarines could optimise different power sources. For mobile operations, for example, NCA batteries and diesel is ideal, while an ambush submarine would operate better on fuel cells, LTO and diesel. The lowest-cost option would be LTO and diesel.
Japan's introduction of a submarine employing Li-ion batteries is the culmination of many years of research that commenced in 1962. The first Li-ion battery was ready in 1974 but it did not meet requirements.
Because fuel cell technology was not yet mature and the cost of Li-ion batteries was prohibitive, Japan turned to Stirling AIP systems. From 1991-97 AIP was used on a testbed before being installed into a Harushio-class submarine in 2000-01 for trials.
Meanwhile, tests on Li-ion batteries continued to the point that the JMSDF asked for a Li-ion-powered Soryu-class boat in its FY2015 budget request.
Lithium Ion submarine batteries, just seems like a bad idea from the get go.
I’ve seen what they can do to a cell phone. I can only imaging what they’d do in a submarine.
So how many AA batteries does it take to power a submarine?
As long as the battery doesn’t break, like a laptop battery should not break open. They should be okay. I mean really, our navy has submarines powered by a nuclear reactor. Did you think about that?!!! I wonder what recharge mechanism the submarines have.
Diesel? Noisy?
I kinda like it. IF they can make it work, I bet its gonna be red October-level quiet
Feeling you on the cell phones, however.
Yes noisy on the surface but they can stay down a long time. These are not your GF diesel boats.
Solar.
Sounds like an underwater kamikazi mission to me. Li ion batteries are too volatile and explode way too easily.
Technically, I think they’ll be using 18650 batteries, just like the Tesla. It is the same shape as a AA, but larger.
My vaporizer and flashlights use that size. They rock.
No worse than a lead-acid battery getting sea water in it.
If you’re getting seawater in your battery compartment you’re in a world of hurt anyway, and the type of battery probably doesn’t matter much.
“If you’re getting seawater in your battery compartment you’re in a world of hurt anyway, and the type of battery probably doesn’t matter much.”
I am going to hypothesize that they are in sponsons outside the sub’s air compartment and that they are in nearly indestructible individual cases. I wonder what effect a nearby explosion would have on them. Also, if they are small and hooked together each connection becomes an additional point of failure. As to charging them either a nuclear battery (a type of dry-cell except it generates charge) or a fuel cell would do a nice job.
They’re using diesels to charge. These are straight-up diesel-electric boats with a new battery technology, by my reading of this.
“They’re using diesels to charge.”
You know, I thought that can’t be right because they are usually at the top of the technology game. I can see having a diesel as a backup. (It’s a rare article where the reporter gets it mostly right.)
On the other hand, having been in the military industrial complex for thirty years, I have seen a lot of resistance to even proven newer technology.
The Japanese have the best conventional subs in the world, but snorkeling while recharging batteries is revolutionary?
The Kriegsmarine might want to discuss that with the Japanese MSDF.
OK, that’s funny right there!
I think what’s revolutionary is the quick charging of the LI batteries, such that you’re at the surface / snorkeling with the diesels running for a much shorter period than with longer-charging-cycle lead-acid batteries.
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