Low-grade　thermal　energy　utilization　plays　an　important　role　in　addressing　escalating　energy　demand　and　environmental　challenges.　However,　primary　low-grade　thermal　energy　harvesting　technologies　are　currently　only　capable　of　their　own　single　and　fixed　energy　conversion　and　transport　modes,　which　limits　their　further　application.　To　break　this　bottleneck,　we　innovatively　propose　an　electrochemical　energy　converter　(EEC(s))　cycle　model,　which　consists　of　three　isothermal　processes　and　three　open-circuit　heating　(or　cooling)　processes　and　operates　between　three　heat　reservoirs.　Notably,　the　proposed　EEC(s)　integrates　and　enables　flexible　switching　of　thermal-to-electricity　and　thermal-to-refrigeration　harvesting　strategies.　Moreover,　the　complementary　roles　of　thermal　energy　and　electricity　are　enabled　to　meet　different　levels　of　cooling　demand.　Significantly,　its　extraordinary　thermal-to-refrigeration　conversion　efficiency　and　great　potential　as　an　alternative　to　conventional　thermally　driven　refrigerators　are　emphasized.　Specifically,　when　the　EEC(s)　operates　at　maximum　cooling　power　density,　a　thermal-to-refrigeration　conversion　performance　coefficient　of　0.498　and　a　Carnot-relative　efficiency　of　32.3%　are　predicted　for　the　given　operating　temperatures.　Additionally,　the　different　roles　of　the　cell　parameters　in　enhancing　the　EECs　performance　are　specified.　This　work　demonstrates　the　feasibility　of　integrating　multiple　energy　conversion　and　transport　modes　into　a　novel　electrochemical　cycle　configuration　and　provides　a　promising　solution　for　efficient　and　comprehensive　low-grade　thermal　energy　utilizations.　©　2025　Elsevier　Ltd