The Global Market for Primary Thermal Batteries 2026–2037

1             EXECUTIVE SUMMARY            13

• 1.1        Market size, historical trajectory, and forecast        13
• 1.2        Industry structure and competitive dynamics         14
• 1.3        Technology landscape and supply chain    15
• 1.4        Applications and demand drivers     16
• 1.5        Key findings    17
• 1.6        Strategic implications for stakeholders        18
  • 1.6.1    For incumbent manufacturers           18
  • 1.6.2    For prospective new entrants             18
  • 1.6.3    For defence primes and integrators 18
  • 1.6.4    For equipment and materials suppliers       18
  • 1.6.5    For investors and corporate development  19
• 1.7        Watchlist — key developments to monitor over the forecast period          19
  • 1.7.1    European defence spending trajectory         19
  • 1.7.2    US space launch cadence     19
  • 1.7.3    Hypersonic weapons deployment   19
  • 1.7.4    Li-ion primary substitution rate          19
  • 1.7.5    Chinese industry evolution   19

2             INTRODUCTION TO PRIMARY MOLTEN SALT BATTERIES  20

• 2.1        Definition and scope of the market 20
• 2.2        Distinction from thermal energy storage and Li-ion              21
• 2.3        Operating principles  21
• 2.4        Historical development, 1940s–present     22
• 2.5        Current industry structure     23

3             HISTORICAL MARKET DATA AND SEGMENTATION, 2020-2025    25

• 3.1        Global market size, 2020–2025         25
• 3.2        Segmentation by application              26
• 3.3        Segmentation by region          28
• 3.4        Segmentation by end-user type         29
• 3.5        Segmentation by chemistry 29
• 3.6        Segmentation by voltage        31

4             APPLICATIONS              32

• 4.1        Overview           32
• 4.2        Fundamental application characteristics   32
• 4.3        Fielded applications — missile and munitions       33
  • 4.3.1    Air-defence and ballistic missile defence interceptors      33
  • 4.3.2    Air-to-air missiles       33
  • 4.3.3    Surface-to-surface and cruise missiles       33
  • 4.3.4    Anti-tank guided missiles      34
  • 4.3.5    Artillery-launched guided munitions             34
• 4.4        Fielded applications — torpedoes and sonobuoys              34
  • 4.4.1    Lightweight torpedoes             34
  • 4.4.2    Heavyweight torpedoes          34
  • 4.4.3    Sonobuoys      34
• 4.5        Fielded applications — aerospace and safety systems     34
  • 4.5.1    Ejection seat and aircrew emergency power             34
  • 4.5.2    Emergency locator transmitters and flight recorders           35
  • 4.5.3    Spacecraft launch vehicle stage separation and satellite deployment    35
• 4.6        Fielded applications — emergency defence electronics   35
  • 4.6.1    Radar and communications backup              35
  • 4.6.2    Electronic warfare payload emergency power         35
  • 4.6.3    Nuclear weapons safing and control              35
• 4.7        Emerging applications             35
  • 4.7.1    Miniaturised smart munitions and guided small-calibre projectiles         36
  • 4.7.2    Hypersonic weapons                36
  • 4.7.3    Small-satellite deployment and CubeSat class missions 36
  • 4.7.4    Autonomous underwater vehicles and specialty naval systems 36
  • 4.7.5    Directed-energy weapon system emergency power             36
• 4.8        Potential applications              36
  • 4.8.1    Specialty industrial safety systems 36
  • 4.8.2    Deep-space and planetary science mission emergency power   37
  • 4.8.3    Cryogenic and extreme-environment scientific instrumentation 37
• 4.9        Application Technology Readiness Level (TRL) assessment           37

5             TECHNOLOGY LANDSCAPE 41

• 5.1        Cell architecture and technology positioning          41
• 5.2        Anode chemistries     43
• 5.3        Cathode chemistries                44
• 5.4        Electrolyte-separator systems           45
• 5.5        Pyrotechnic heat sources and ignition          47
• 5.6        Thermal insulation and packaging  48
• 5.7        Hermetic sealing         49
• 5.8        Technology trends, innovation frontier, and academic R&D landscape  50
  • 5.8.1    Miniaturisation for smart munitions and guided small-calibre projectiles            52
  • 5.8.2    Alternative pyrotechnic oxidisers for environmental and regulatory compliance             52
  • 5.8.3    Additive manufacturing for specialty thermal battery components           53
  • 5.8.4    Alternative cathode chemistries beyond FeS₂, CoS₂, and NiCl₂   53
• 5.9        Patent landscape        54
• 5.10     Reserve battery positioning and adjacent chemistries       55

6             COMPETITIVE LANDSCAPE  57

• 6.1        Global competitive structure               57
• 6.2        Tier structure of the global industry 58
• 6.3        Cross-Manufacturer Comparative Analysis              59
  • 6.3.1    Product portfolio comparison            59
  • 6.3.2    Manufacturing model comparison  60
    • 6.3.2.1 Capability radar           61
• 6.4        Downstream Customer Landscape and Missile Programme Mapping    62
  • 6.4.1    Missile programmes using primary thermal batteries         62
  • 6.4.2    Non-missile applications and downstream customers     64

7             MANUFACTURING VALUE CHAIN     66

• 7.1        End-to-end value chain overview     66
• 7.2        Powder synthesis and preparation  67
• 7.3        Pellet pressing and tape casting       69
• 7.4        Cell and stack assembly        71
• 7.5        Welding, hermetic sealing, and leak testing              72
• 7.6        Qualification testing and MIL/aerospace compliance        73
• 7.7        Cross-manufacturer value chain and cost structure           74

8             SUPPLY CHAIN AND ECOSYSTEM   77

• 8.1        Supplier ecosystem overview             77
• 8.2        Equipment supplier landscape by process step     78
• 8.3        Key supplier categories           79
• 8.4        Manufacturer–supplier relationship map    83
• 8.5        Supplier commercial accessibility  84
• 8.6        Export licensing and transportation regulations     85

9             RAW MATERIALS — Iron Disulfide (FeS₂)      88

• 9.1        Role of FeS₂ in the value chain           88
• 9.2        Production routes       89
• 9.3        Battery-grade specifications               90
• 9.4        FeS₂ supplier landscape        91
• 9.5        Sourcing concentration and supply chain risk         93

10          MARKET OUTLOOK AND FORECASTS 2026–2037 94

• 10.1     Forecast methodology and assumptions   94
• 10.2     Base-case global market forecast, 2026–2037      95
• 10.3     Segmented forecasts by application              96
• 10.4     Regional forecasts     97
• 10.5     Chemistry-segmented forecast         98

11          STRATEGIC IMPLICATIONS AND RECOMMENDATIONS    100

• 11.1     Implications for incumbents               100
  • 11.1.1 Technology maintenance      100
  • 11.1.2 Supply chain resilience           100
  • 11.1.3 Geopolitical positioning         100
• 11.2     Implications for prospective new entrants 100
• 11.3     Implications for equipment and raw material suppliers    101
• 11.4     Watchlist and forward-looking observations            102

12          COMPANY PROFILES                104 (8 company profiles)

13          APPENDICES  116

• 13.1     Research methodology and sources              116
• 13.2     Primary research programme             116
• 13.3     Scope definition and boundary decisions  117
• 13.4     Market sizing methodology   117
• 13.5     Forecast methodology            118
• 13.6     Data sources by category      118
• 13.7     Analytical framework and computational methodology   119
• 13.8     Limitations of the analysis    120
• 13.9     Glossary and abbreviations 121
  • 13.9.1 Glossary of technical and industry terms   121
  • 13.9.2 Abbreviations 125

14          REFERENCES 128

List of Tables

• Table 1. Key findings summary          17
• Table 2. Primary thermal batteries vs adjacent electrochemical and thermal categories           21
• Table 3. Milestones in primary thermal battery development        22
• Table 4. Global market size by year, 2020–2025 (USD millions)   26
• Table 5. Application segments with typical performance requirements 27
• Table 6. Regional market segmentation and drivers             28
• Table 7. End-user segmentation — merchant defence, captive defence prime, government R&D        29
• Table 8. Chemistry-segmented market with historical shift            30
• Table 9. Voltage-segmented market (10-50V, 51-100V, above 101V)        31
• Table 10. Technology Readiness Level assessment of primary thermal battery applications   37
• Table 11. Anode chemistry comparison (LiSi, LiAl, LiB, Ca)            43
• Table 12. Cathode chemistry comparison — FeS₂ vs CoS₂ vs NiCl₂           44
• Table 13. Electrolyte-separator formulations           46
• Table 14. Heat pellet formulations and ignition mechanisms       47
• Table 15. Insulation materials — thermal conductivity, temperature, mass        48
• Table 16. Hermetic seal technologies and typical suppliers           50
• Table 17. Innovation frontier — active research directions and commercial readiness 51
• Table 18. Primary thermal battery patent filings 2015–2025, by assignee and geography           54
• Table 19. Top ten patent assignees and their strategic focus         55
• Table 20. Thermal batteries vs oxyhalide reserve batteries (Li-SOCl₂, Li-SO₂Cl₂)              55
• Table 21. Substitution risk from Li-ion primary cells (Tadiran TLM, Ultralife LTC, Saft LM/LMR)               56
• Table 22. Cross-manufacturer product portfolio comparison       59
• Table 23. Merchant supplier vs captive supplier vs government R&D       60
• Table 24. Missile programmes            63
• Table 25. Non-missile downstream applications   64
• Table 26. Master process step summary — inputs, outputs, environmental control      67
• Table 27. Powder preparation specifications — cathode FeS₂ example  68
• Table 28. Pressing and tape-casting parameters   70
• Table 29. Environmental control and stack assembly parameters             72
• Table 30. Welding techniques and leak test specifications             73
• Table 31. Qualification test protocols and compliance frameworks         74
• Table 32. Cross-manufacturer value chain and cost comparison              75
• Table 33. Master equipment supplier matrix — 12 manufacturers × 7 process steps, confidence-tagged                78
• Table 34. Pellet pressing equipment suppliers        79
• Table 35. Dry room and glove box suppliers               80
• Table 36. Hermetic sealing component suppliers 81
• Table 37. Laser and TIG welding suppliers  81
• Table 38. Leak detection suppliers  82
• Table 39. Powder processing suppliers         82
• Table 40. Qualification testing equipment suppliers            83
• Table 41. Confirmed manufacturer–supplier relationships, with confidence tags           83
• Table 42. Commercial accessibility assessment — willingness, restrictions, lead time              85
• Table 43. Export control frameworks — ITAR, EAR, Wassenaar, EU dual-use      86
• Table 44. Transportation regulations — IATA Dangerous Goods, UN classification, shipping constraints                87
• Table 45. Battery-grade FeS₂ specifications              90
• Table 46. FeS₂ supplier profiles          92
• Table 47. FeS₂ sourcing concentration and risk analysis  93
• Table 48. Forecast assumptions and driver quantification              94
• Table 49. Base-case market forecast by year, 2026–2037 95
• Table 50. Application-segmented forecast 97
• Table 51. Regional forecast  98
• Table 52. Chemistry-segmented forecast   99
• Table 53. Watchlist — key developments to monitor, 2027–2037               102

List of Figures

• Figure 1. Global primary thermal battery market: 2025 base and 2037 forecast               14
• Figure 2. Primary thermal battery — definition and boundary against adjacent categories        20
• Figure 3. Activation sequence and voltage-time profile     22
• Figure 4. Global industry structure and regional distribution of production         24
• Figure 5. Global primary thermal battery market development, 2020–2025       25
• Figure 6. Application segmentation — missiles, munitions, torpedoes, ejection seats, space, other 27
• Figure 7. Regional market split — North America, Europe, Middle East, Asia     28
• Figure 8. Market share by cathode chemistry — FeS₂, CoS₂, NiCl₂             30
• Figure 9. Generic primary thermal battery cross-section  41
• Figure 10. Ragone plot: thermal batteries vs adjacent reserve and primary chemistries             42
• Figure 11. Cell stack architecture with insulation, header, pyrotechnic train      43
• Figure 12. LiSi and LiAl anode microstructure comparison             44
• Figure 13. Cathode chemistry adoption trend, 1980–2025             45
• Figure 14. LiCl–KCl eutectic phase diagram              46
• Figure 15. Heat pellet layering and ignition sequence         47
• Figure 16. Thermal insulation configurations           48
• Figure 17. Glass-to-metal hermetic seal design     49
• Figure 18. Technology trend timeline — tape-casting, automation, alternative chemistries     50
• Figure 19. Competitive landscape map — market share vs technology breadth               57
• Figure 20. Manufacturer overview matrix     58
• Figure 21. Tier structure — global majors, national champions, emerging producers, and coverage-limited entities              59
• Figure 22. Cross-manufacturer capability radar     61
• Figure 23. Missile programme mapping — programme × thermal battery supplier, by region   62
• Figure 24. Primary thermal battery value chain — raw materials to qualified product   66
• Figure 25. Powder preparation process sequence 68
• Figure 26. Pellet pressing and tape-casting approaches compared          70
• Figure 27. Dry room / stack assembly workflow      71
• Figure 28. Can-header welding and helium leak test workflow     73
• Figure 29. Indicative cost structure of a qualified primary thermal battery           75
• Figure 30. Equipment supplier ecosystem map      77
• Figure 31. Equipment supplier concentration by process step     79
• Figure 32. Supplier commercial accessibility scoring         85
• Figure 33. Impact of export controls on commercial accessibility by manufacturer and customer geography        87
• Figure 34. FeS₂ in the primary thermal battery cost structure        88
• Figure 35. Natural pyrite and synthetic FeS₂ production routes    89
• Figure 36. Global FeS₂ supplier geographic distribution    92
• Figure 37. Global primary thermal battery market forecast, 2026–2037, base case       95
• Figure 38. Forecast by application, 2026–2037      97
• Figure 39. Regional forecast, 2026–2037    98
• Figure 40. Cathode chemistry forecast to 2037      99
• Figure 41. Product photograph of an EaglePicher military thermal battery.          106
• Figure 42. Product photograph of a Vitzrocell military thermal battery.   114

The Global Market for Primary Thermal Batteries 2026–2037

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The Global Market for Primary Thermal Batteries 2026–2037

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