JP2018060641A - 車両の電源装置 - Google Patents
車両の電源装置 Download PDFInfo
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- H—ELECTRICITY
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- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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Abstract
Description
車両の電源装置は、第1蓄電素子を有する第1蓄電装置と、第2蓄電素子を有する第2蓄電装置と、前記第1蓄電装置と前記第2蓄電装置を並列に接続した状態と切り離した状態とに切り換えるスイッチと、スイッチ制御部と、を備え、前記第1蓄電素子と前記第2蓄電素子はSOC−OCV特性に平坦な領域を有する蓄電素子であり、前記スイッチ制御部は、前記スイッチのオフからオンへの切り換えを、前記第1蓄電素子と前記第2蓄電素子が前記SOC−OCV特性で平坦な領域に含まれている時に、実行する。
この構成では、2つの蓄電装置にSOC差があっても、プラトー領域内にあれば、2つの蓄電装置の電圧差は小さい。従って、スイッチの切り換え時に、2つの蓄電装置間の電圧差により、スイッチに大きな電流が流れることを抑制することが出来る。
本発明の一実施形態を図1〜図5によって説明する。
1.車両の電源装置Sの説明
図1に示すように、車両1は、セルモータ等のエンジン始動装置10、電源装置Sを備えている。尚、図1は省略してあるが、車両1には、エンジン始動装置10以外に、オルタネータ20、電気負荷30が搭載されている。電気負荷30としては、エアコン、オーディオ、カーナビゲーションなどを例示することができる。
電源装置Sは、第1バッテリ50Aと、第2バッテリ50Bと、第1スイッチSW1と、車両ECU70とを含んで構成されている。図2に示すように、第1バッテリ50Aには、エンジン始動装置10及びオルタネータ20が接続されており、また、第2バッテリ50Bには、電気負荷30及び車両ECU(電子制御装置:Electronic Control Unit)70が接続されている。尚、第1バッテリ50Aが本発明の「第1蓄電装置」の一例、第2バッテリ50Bが本発明の「第2蓄電装置」の一例である。また、第1スイッチSW1が本発明の「スイッチ」の一例であり、車両ECU70が本発明の「スイッチ制御部」の一例である。
第1バッテリ50Aの二次電池53Aと第2バッテリ50Bの二次電池53Bは、いずれも、正極活物質にリン酸鉄リチウム(LiFePO4)、負極活物質にグラファイトを用いたリン酸鉄系のリチウムイオン電池である。
また、車両ECU70は、エンジン始動時は、第1バッテリ50Aの温度Tに応じて、第1スイッチSW1のオン、オフを切り換える。図5を参照して、具体的に説明すると、車両ECU70は、イグニッションスイッチの状態を検出する処理を実行する(S10)。
本実施形態の電源装置Sは、第1バッテリ50A、第2バッテリ50Bの双方ともリン酸鉄系のリチウムイオン二次電池53A、53Bであり、SOC−OCV特性にプラトー領域Pを有している。プラトー領域P内では、2つのバッテリ間にSOC差があっても、2つのバッテリ間の電圧差Va−Vbは小さい。そのため、第1スイッチSW1をオフからオンに切り換える時に、バッテリ間の電圧差Va−Vbにより、第1スイッチSW1に大きな電流(横流)が抑えることが出来る。尚、横流とは、電圧差Va−Vbにより、2つのバッテリ間に流れる電流を意味する。
<他の実施形態>
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
(1)本実施形態では、バッテリ50A、50Bを組電池51A、51Bで構成して例を示したが、バッテリ50A、50Bを単セル、例えば、1つのリチウムイオン二次電池53A、53Bで構成してもよい。
20...オルタネータ
30...車両ECU
50A...第1バッテリ(本発明の「第1蓄電装置」の一例)
50B...第2バッテリ(本発明の「第2蓄電装置」の一例)
51A、51B...組電池
53A...リチウムイオン二次電池(本発明の「第1蓄電素子」の一例)
53B...リチウムイオン二次電池(本発明の「第2蓄電素子」の一例)
55...電流センサ
60A、60B...監視部
70...車両ECU(本発明の「スイッチ制御部」の一例)
SW1...第1スイッチ(本発明の「スイッチ」の一例)
SW2...第2スイッチ
S...電源装置
Claims (9)
- 車両の電源装置であって、
第1蓄電素子を有する第1蓄電装置と、
第2蓄電素子を有する第2蓄電装置と、
前記第1蓄電装置と前記第2蓄電装置を並列に接続した状態と切り離した状態とに切り換えるスイッチと、
スイッチ制御部と、を備え、
前記第1蓄電素子と前記第2蓄電素子はSOC−OCV特性に平坦な領域を有する蓄電素子であり、
前記スイッチ制御部は、前記スイッチのオフからオンへの切り換えを、前記第1蓄電素子と前記第2蓄電素子が前記SOC−OCV特性で平坦な領域に含まれている時に、実行する、車両の電源装置。 - 請求項1に記載の車両の電源装置であって、
前記第1蓄電装置はエンジン始動装置に接続され、
前記スイッチ制御部は、エンジン始動時に、所定の条件を満たす場合、前記スイッチをオンして、前記第1蓄電装置と前記第2蓄電装置を並列に接続する、車両の電源装置。 - 請求項2に記載の車両の電源装置であって、
前記所定の条件を満たす場合とは、前記第1蓄電素子の温度が閾値より低い場合、前記第1蓄電素子の内部抵抗が閾値よりも高い場合、前記第1蓄電素子の電圧値が閾値よりも低い場合のいずれかの場合である、車両の電源装置。 - 請求項2または請求項3に記載の車両の電源装置であって、
前記第2蓄電装置は、前記エンジン始動装置とは異なる電気負荷に接続され、
前記スイッチ制御部は、エンジン始動時に、前記所定の条件を満たさない場合、前記スイッチをオフして、前記第1蓄電装置と前記第2蓄電装置とを切り離す、車両の電源装置。 - 請求項1〜請求項4のいずれか一項に記載の車両の電源装置であって、
前記第1蓄電素子の正極活物質種と第2蓄電素子の正極活物質種とが同一であり、かつ第1蓄電素子の負極活物質種と第2蓄電素子の負極活物質種とが同一である、車両の電源装置。 - 請求項5に記載の車両の電源装置であって、
正極活物質はリン酸鉄リチウム、負極活物質はグラファイトである、車両の電源装置。 - 請求項1〜請求項6のいずれか一項に記載の車両の電源装置であって、
前記第1蓄電装置と前記第2蓄電装置は実容量が異なる、車両の電源装置。 - 車両の電源装置であって、
第1蓄電素子を有する第1蓄電装置と、
第2蓄電素子を有する第2蓄電装置と、
前記第1蓄電装置と前記第2蓄電装置を並列に接続した状態と切り離した状態とに切り換えるスイッチと、
スイッチ制御部と、を備え、
前記第1蓄電装置はエンジン始動装置に接続され、
前記スイッチ制御部は、エンジン始動時に、所定の条件を満たす場合、前記スイッチをオンして、前記第1蓄電装置と前記第2蓄電装置を並列に接続する、車両の電源装置。 - 請求項8に記載の車両の電源装置であって、
前記所定の条件は、前記第1蓄電素子の温度が閾値より低い場合、前記第1蓄電素子の内部抵抗が閾値よりも高い場合、前記第1蓄電素子の電圧値が閾値よりも低い場合のいずれかの場合である、車両の電源装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016196273A JP6902201B2 (ja) | 2016-10-04 | 2016-10-04 | 車両の電源装置 |
CN201710910040.3A CN107895819B (zh) | 2016-10-04 | 2017-09-29 | 车辆的电源装置 |
US15/723,997 US11235682B2 (en) | 2016-10-04 | 2017-10-03 | Power supply device for vehicle |
DE102017217574.5A DE102017217574A1 (de) | 2016-10-04 | 2017-10-04 | Stromversorgungsvorrichtung für ein fahrzeug |
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JP2016196273A JP6902201B2 (ja) | 2016-10-04 | 2016-10-04 | 車両の電源装置 |
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JP2018060641A true JP2018060641A (ja) | 2018-04-12 |
JP6902201B2 JP6902201B2 (ja) | 2021-07-14 |
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US20180093581A1 (en) | 2018-04-05 |
DE102017217574A1 (de) | 2018-04-05 |
JP6902201B2 (ja) | 2021-07-14 |
CN107895819B (zh) | 2022-06-03 |
CN107895819A (zh) | 2018-04-10 |
US11235682B2 (en) | 2022-02-01 |
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