On July 18, 2028 wispywood2344 kindly provided the following:
Hi Pete
To maximize the performance of [Lithium-ion Batteries] LIBs in a conventionally powered submarine, simply
replacing conventional [Lead-acid Batteries] LABs with LIBs is not sufficient.
The JMSDF [Japanese Navy] is refining its design in stages, as described below.
The [Japanese Navy] adopted the 1st-generation submarine LIB [submarine Lithium H? = ] “SLH”
[Pete comment - this may be a cover name for LCO = Lithium Cobalt Oxide (LiCoO2). The "Battery University" comments on LCOs for small consumer devices, are probably unrepresentative of much larger (100s of tonnes) scale, more advanced Japanese submarine battery developments]
on the 11th
Soryu-class (Soryu Mk.2 [named by Pete] ), and eliminated both AIP and LABs.
However, since the [submarine Lithium H?] “SLH” had the same dimensions as conventional LAB, it created significant dead space within the battery compartment.[1]
Furthermore, because the diesel generators were not modified, the improvement in the indiscretion ratio was limited.
The same situation applied to the first 3 Taigei-class submarines in the Table below (they are the Taigei Mk.1s). Into each of those Taigeis 2 x Kawasaki 12V25/25SB diesel generators were fitted (see redded diesels in the Table below).
But in the 4th Taigei (the first Taigei Mk.2) two newly developed diesel generators were fitted. These were 2 x Kawasaki 12V25/31S. Each generator had increased output (up to +50%) leading to a substantial improvement in the indiscretion ratio.[2]
Going forward, the 11th Taigei (Taigei Mk.3) is expected to adopt the
2nd-generation submarine LIB known as “SLI” formula unknown? [3]
This will improve not only the energy density of individual battery modules but
also the packing density of battery modules within the battery compartment,
leading to a significant improvement in total energy storage capacity.[1]
In the post-Taigei-class submarines [Pete comment. Might the new class name be "Raijin" God of lightning/storms or "Wani" sea monster/shark?] expected to enter service around 2034, the
total ship design will be optimized, including the dimensions and shapes of the
internal compartments and the propulsion motor.[4][5]
[Pete comment - Wiki reports - KHI received a research and development contract from the Japanese Ministry of Defense on December 29, 2023 to design a post-Taigei class diesel electric submarine possibly with VLS to deploy stand-off missiles? Was KHI also asked to do an initial nuclear reactor study?]
I find it fascinating to see what requirements countries that do not need large
conventionally powered submarines to the same extent as Japan place on their
own submarines, and in what direction they are evolving them."
[1] https://warp.ndl.go.jp/20250801/20250801001909/https://www.mod.go.jp/atla/research/ats2024/pdf_exhi_pos/p-13.pdf
[2] TRDI specification
"New Snorkel Generator System (Part.2)" p.4
[3] https://www.mod.go.jp/atla/souhon/choutatsuyotei/r08_choutatsuyotei.xlsx#
See row2459
[4] https://www.mod.go.jp/atla/research/ats2025/pdf_oral_matl/1112_1100_s13.pdf
[5] https://warp.ndl.go.jp/20250901/20250901000226/https://www.mod.go.jp/atla/research/ats2024/pdf_exhi_pos/p-18.pdf
Regards wispywood2344
-------------------
This Table is unique to Submarine Matters mainly created by "S"/Anonymous wispywood2344 and Pete.
Japan's Diesel-Electric Classes of Submarine (SSKs)
The 2nd Oyashio class, Soryus & Taigeis as at March 13, 2026.
SS No. Diesel Type Motor | Build No Name | Pennant No. | Ministry of Finance (MoF) approved Ministry of Defense Budget in Billions of Yen (¥B) | LABs + AIP: or LIBs | Laid Down | Laun -ched | Comm ission ed | Built By |
8105 + 8106 Oya shio means currents | ¥52.2B FY1993 2 x 12V25/25S diesels for all Oyashio class (each diesel 2,000kW) | LABs only | 1994 & 1995 | 1996 & 1997 | Built at KHI | |||
7SS-15SS 8 active Oyashios 10 subs SMC-7? | 8107 -8115 various | SS-591-600 | ¥52.2B per sub FY1994-FY2003 | LABs only | 15SS Feb 2004 | 15SS Nov 2006 | 15SS Mar 2008 | MHI & KHI |
16SS Dragon class Mk I | 8116 | SS-501 | ¥60B FY2004 Mk.1 LAB+AIP Soryus have 2 x Kawasaki + a SMC-8 motor | LABs + AIP | Mar 2005 | Dec 2007 | Mar 2009 | Built at MHI Home Port Kure |
17SS | 8117 Unryū | SS-502 | ¥58.7B FY2005 | LABs + AIP | Mar 2006 | Oct 2008 | Mar 2010 | KHI Kure |
18SS | 8118 Hakuryū | SS-503 | ¥56.2 FY2006 | LABs + AIP | Feb 2007 | Oct 2009 | Mar 2011 | MHI Kure |
19SS | 8119 Kenryū | SS-504 | ¥53B FY2007 | LABs + AIP | Mar 2008 | Nov 2010 | Mar 2012 | KHI Kure |
20SS | 8120 Zuiryū | SS-505 | ¥51B FY2008 | LABs + AIP | Mar 2009 | Oct 2011 | Mar 2013 | MHI Yokosuka |
21SS LIBs Concept Research Project | No 21SS built. It was an 8 year research project on LIBs. 1st LIBs sub launched was 27SS in 2018. | |||||||
22SS | 8121 Kokuryū | SS-506 | ¥52.8B FY2010 | LABs + AIP | Jan 2011 | Oct 2013 | Mar 2015 | KHI Yokosuka |
23SS | 8122 Jinryu | SS-507 | ¥54.6B FY2011 | LABs + AIP | Feb 2012 | Oct 2014 | 7 Mar 2016 | MHI Kure |
24SS | 8123 Sekiryū | SS-508 | ¥54.7B FY2012 | LABs + AIP | KHI Kure | |||
25SS | 8124 | SS-509 | ¥53.1B FY2013 | LABs + AIP | 22 Oct 2013 | 12 Oct 2016 | MHI Yokosuka | |
26SS | 8125 | SS-510 | LABs + AIP | 2014 | 6 Nov 2017 | KHI Kure | ||
27SS a Soryu "Mk II" as it has LIBs. 1st Soryu Mk II | 8126 | SS-511 | ¥64.4B FY2015 with 2 12V25/25SB diesels (totaling 4,240kW) agree it has 640 LIB/SLH modules], other improvements | LIBs only (SLH type) | Nov 2015 | 4 Oct 2018 | 2020 | MHI Kure |
28SS Soryu Mk II, final Soryu | 8127 | SS-512 | NCA? LIBs | Jan 2017 | KHI Yokosuka | |||
29SS 1st Taigei Class means Whale 3,000 tonne (surfaced) | 8128 Taigei "Big whale" Used as test sub. Not opera- tional | SS-513 | ¥76B FY2017 (Heisei 29) Higher ¥76B budget may be due to 1st of class many changes. Kawasaki 12V25/25SB 2 x 12V25/25SB says 640 LIB/SLH modules, Anon says 720.] | SLH LIBs maybe 960 | 14 Oct 2020 | 9 Mar 2022 | MHI Home Port Yokosuka | |
30SS 2nd Taigei Class | 8129 Hakugei "White whale" First opera- tional Taigei | SS-514 | SLH LIBs | KHI Home Port Kure | ||||
| 8130 Jingei "Swift whale" | SLH LIBs maybe 960+ | 8 Mar 2024 | MHI | |||||
02SS 4th Taigei Class | 8131 Raigei Thunder whale | SS-516 | Improved SLH LIBs | 26 Mar 2021 | KHI | |||
03SS 5th Taigei Class | SS-517 | LIBs | 19 Apr 2022 | 10 Mar 2026 | MHI | |||
04SS 6th Taigei Class | SS-518 | LIBs | 28 Mar 2023 | March? 2027 | KHI | |||
05SS 7th Taigei Class | 8134 | SS-519 | LIBs | 17 Apr 2024 | 2026 | March? 2028 | MHI | |
06SS 8th Taigei Class | 8135 | SS-520 | ¥95.0B FY2024 page 23 | LIBs | 19 Dec 2024 | 2027 | March?2029 | KHI |
07SS 9th Taigei Class | 8136 | SS-521 | LIBs | 2026 | 2028 | 2030 | MHI | |
08SS 10th Taigei Class | 8137 | SS-522 | ¥B120.8 "for 10th Taigei... for enhanced detection capabilities & manpower saving systems for effective intelligence & surveillance activities" page 27 [2] | LIBs | 2027 | 2029 | March? 2031 | KHI |
¥***B = Billion Yen. MHI = Mitsubishi Heavy Industries, KHI = Kawasaki Shipbuilding Corporation of Kawasaki Heavy Industries.
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