成果報告書詳細
管理番号20110000001078
タイトル*平成22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)/Liイオンバッテリ等蓄電池のバッテリマネジメントシステム(BMS)の技術開発
公開日2011/6/29
報告書年度2010 - 2010
委託先名電動車両技術開発株式会社
プロジェクト番号P10020
部署名技術開発推進部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等
【1】BMS のソフトウェア開発
(a)精度良い容量検出&劣化検出のアルゴリズム構築
従来と比べ精度良い容量算出(SOC 算出)を行うアルゴリズムの開発を行った。また、従来は車上でできなかった劣化検出を車上で実施するアルゴリズムの開発を行った。
SOC 算出については、電圧法と電流積算法を組み合わせた算出法を採用した。加えて、不定期ではあるが充電前に放電を行って残量を実計測(充電前の残量が少ない場合のみ実施)し、同結果とSOC算出結果の差異を求め、補正係数とした。放電終止電圧では、SOC がリセットされるアルゴリズムとした。
劣化検出のアルゴリズムは、充電完了後に車載されている負荷装置例えばモーターあるいは暖房用ヒーター等へ大電流を流し、その時得られる電圧応答波形(IR ドロップ)から劣化度合を検出するアルゴリズムとした。
英文要約1) Objective of this study
Our objective is to construct and develop a BMS regarding LIB of EV in order to perform the management, monitoring, and diagnosis. For this purpose, two research themes were conducted here: (1) The former is focused on making a new evaluation method of SOC (State of Charge) and SOH (State of Health) of LIB. Additionally, a data-gathering & analysis system that can inform the SOC or SOH in real time is introduced. (2) The latter is performed to design a newly structured package of LIB under thermal control, since the values of parameters used for estimation of the SOC and/or SOH are influenced by a temperature. The designed package expects to take LIB's life longer with thermal control.
2) Results
We programmed to construct a BMS. In our program, SOC can be estimated by combination with the methods reading open-circuit potential and integrating the current going in and out of LIB pack. SOH can be determined by the chronopotentiogram using a constant-current pulse.
In order to predict the performance of LIB depending on operation condition and load, a charge/discharge measurement apparatus and an impedance spectroscopy instrument were introduced. In the first step, the feature of LIB with laminate-type cells under the various experimental conditions is examining with these instruments. The data observed with these instruments are going to be used for verification of the algorithm in our BMS programs. Here, we are using the LIB with laminate-type cell one module of which is about 2kWh and about 50V with 28 cells.
Furthermore, we constructed and developed a monitoring system for LIB performance and behavior. Our system consists of data communication module and date monitoring servers. The servers support web applications for graph display. We have already confirmed that our system gains an adequate performance with simulated data. On the base of the data demonstrating our success in this year, subsequent researches developing the control unit of LIB pack are going to be carried out. And we intend showing the effectiveness of our systems under driving-state of EV which is equipped with our BMS and LIB pack.
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