成果報告書詳細
管理番号20150000000682
タイトル*平成26年度中間年報 新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業 (燃料電池・蓄電池) リチウムイオン電池システム用アクティブ・バランサICの技術開発
公開日2016/3/1
報告書年度2014 - 2014
委託先名EVTD株式会社
プロジェクト番号P10020
部署名イノベーション推進部
和文要約
英文要約Title: New Energy Venture Business Technology Innovation Program / New Energy Venture Business Technology Innovation Program (fuel cells and storage battery) / Development of Active-Balancing IC for Large Li-ion Battery Packs (FY2014-FY2015)FY2014 Annual Report

High performance Battery Management System (BMS) is necessary to improve the performance of EV and HEV. One of BMS’s important functions is balancing which allows all cells to charge and discharge their full state of charge (SOC). The simplest balancing solution is discharging cells through bypass resistors, which is known as passive balancing method. Passive balancing method is dominant way now but has large dissipating energy. Active balancing method is new technology for longer age and larger capacity of Li-ion Battery Packs. Instead of discharge through bypass resistor, the active balancer transfers charge between cells by the means of DC to DC converters. Unlike passive balancing method, it’s high efficiency and allows higher balancing current. But BMS developers are seeking the improvements on active balancing method, which are lower cost and easy-to-use. In this development, we try to achieve them by developing an active balancing specific IC. The key of improvements are to optimize the performance vs. cost tradeoff and our strategy is followings. (1) Suitable Silicon Foundry Process, CMOS and High Voltage Extensions. (2) Simple Topology, Bidirectional Synchronous DC to DC Converter Type. (3) Small Silicon Die and Low Cost Parts, Controller IC and external MOS FETs. We've already finished selection of silicon foundry and set up Process Design Kit (PDK) for our IC CAD. So we are running top-level simulations with Verilog-A language. The IC model consist of many cells, for example, bandgap voltage reference, current bias, voltage regulator, oscillator, switching duty controller, output buffers, current limit circuit, input logics and so on. The simulation results are good that the IC can control inductive current direction and target value but we’re trying to design more efficient system and find reasonable specifications to achieve higher performance and lower cost. Next step is device-level circuit design for all cells and checking timing, process and temperature margin and so on. The IC will require several thousand devices finally, so it’s still in the early-to-middle stages of development.
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