JP2018006199A - ニッケル水素蓄電池の再生方法及びニッケル水素蓄電池の再生装置 - Google Patents
ニッケル水素蓄電池の再生方法及びニッケル水素蓄電池の再生装置 Download PDFInfo
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- 229910052987 metal hydride Inorganic materials 0.000 title claims abstract description 133
- 238000011069 regeneration method Methods 0.000 title abstract description 29
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 85
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 60
- -1 nickel metal-hydride Chemical class 0.000 claims abstract description 59
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 24
- 230000001172 regenerating effect Effects 0.000 claims abstract description 24
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910001882 dioxygen Inorganic materials 0.000 claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000007600 charging Methods 0.000 claims description 101
- 239000001257 hydrogen Substances 0.000 claims description 50
- 229910052739 hydrogen Inorganic materials 0.000 claims description 50
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 43
- 229910000652 nickel hydride Inorganic materials 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000010277 constant-current charging Methods 0.000 claims description 7
- 238000010280 constant potential charging Methods 0.000 claims description 3
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims 2
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 description 20
- 239000007789 gas Substances 0.000 description 14
- 230000007423 decrease Effects 0.000 description 13
- 230000008929 regeneration Effects 0.000 description 13
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 10
- 230000003247 decreasing effect Effects 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 10
- 150000004681 metal hydrides Chemical class 0.000 description 9
- 230000033228 biological regulation Effects 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 8
- 239000008151 electrolyte solution Substances 0.000 description 7
- 206010000117 Abnormal behaviour Diseases 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000000354 decomposition reaction Methods 0.000 description 5
- 230000001747 exhibiting effect Effects 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000010278 pulse charging Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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- H—ELECTRICITY
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Abstract
Description
(正極)OH− → 1/4O2+1/2H2O+e― …(1)
(負極)M+H2O+e― → MH+OH− …(2)
MH+1/4O2 → M+1/2H2O …(3)
一方、正極から酸素が発生して内部圧力が上昇し、内部圧力が開弁圧以上となると、安全弁33が開いて、外部に酸素ガスが排出される。酸素ガスが排出されると、半反応式(3)で示す反応、すなわち充電部分が未充電部分に戻る反応が抑制される。そのため、水素を吸蔵した水素吸蔵合金は、水素を吸蔵した状態が維持され、負極の未充電部分がある場合には、半反応式(2)で示す反応が進行して放電リザーブR2が確保される。
(1)複数の電池モジュール11を並列に接続して充電装置51から電流を供給する。充電が開始されると、電池容量が低下した電池から順に、満充電状態となる。また、満充電状態になった電池に対して充電を継続することにより、当該電池モジュール11は過充電される。過充電時、正極からは酸素ガスが発生する。この酸素ガスの少なくとも一部を安全弁33から排出することで、負極の水素吸蔵合金に水素を吸蔵させ、負極の容量を回復させることができる。
・図6に示すように、電池モジュール11の安全弁33にホース60を介して流量計61を接続して安全弁33が開いたことを検出してもよい。流量計61は安全弁33から排出される気体の流量を計測するものである。制御装置52は、流量計61によって計測された流量が所定量以上である場合に、安全弁33が開いたと判断する。或いは、流量計61の替わりに、酸素検出器や、安全弁33からガスが排出される際の音等を検出するリークディテクター、赤外線カメラなどの開弁検出部を用いてもよい。これらの測定器を用いる場合には必ずしもホース60を安全弁33に接続するとは限らない。この構成及び方法によれば、安全弁33が開いた後に目標開弁後充電量だけさせる工程を電池モジュール11毎に個別に行う必要がないので、複数の電池モジュール11の再生を一度に且つ効率的に行うことができる。
・上記各実施形態では、ニッケル水素蓄電池の再生方法及び再生装置を、電気自動車やハイブリッド自動車の動力源として用いられる電池モジュール11に適用したが、他の装置の電源として用いられる電池モジュール11に適用してもよい。
Claims (8)
- 水素吸蔵合金を負極合剤として有し、電池ケースの内部圧力が所定の圧力以上であるときに開く安全弁を備えたニッケル水素蓄電池の再生方法であって、
1又は複数の単電池を一体化してなるニッケル水素蓄電池を複数並列に接続し、前記ニッケル水素蓄電池に並列に接続された充電装置から電流を供給して前記ニッケル水素蓄電池を過充電状態とし、過充電状態の前記ニッケル水素蓄電池の正極で発生した酸素ガスの少なくとも一部を、前記安全弁を介して前記電池ケース外に排出させることで負極の放電リザーブを回復させる
ことを特徴とするニッケル水素蓄電池の再生方法。 - 前記充電装置から前記ニッケル水素蓄電池に供給する電流を一定にする定電流充電、一定の電圧を印加する定電圧充電、又はそれらの組み合わせた定電流定電圧充電によって前記ニッケル水素蓄電池を過充電状態とする
請求項1に記載のニッケル水素蓄電池の再生方法。 - 前記ニッケル水素蓄電池及び前記充電装置との間には、前記ニッケル水素蓄電池及び前記充電装置を接続及び遮断するスイッチが前記ニッケル水素蓄電池毎に設けられ、
前記ニッケル水素蓄電池には、当該ニッケル水素蓄電池の端子間電圧を測定する電圧測定部が設けられ、
正極容量が低下した前記ニッケル水素蓄電池の前記安全弁が開く前の単位時間あたりの電圧上昇幅を予め設定し、
前記ニッケル水素蓄電池の充電中に、前記電圧測定部によって測定された電圧値の電圧上昇幅が、設定した前記電圧上昇幅以上である場合に、当該ニッケル水素蓄電池の充電を停止する
請求項1又は2に記載のニッケル水素蓄電池の再生方法。 - 前記ニッケル水素蓄電池及び前記充電装置との間には、前記ニッケル水素蓄電池及び前記充電装置を接続及び遮断するスイッチが前記ニッケル水素蓄電池毎に設けられ、
前記ニッケル水素蓄電池には、当該ニッケル水素蓄電池の端子間電圧を測定する電圧測定部が設けられ、
正極容量が低下した前記ニッケル水素蓄電池の電圧値であって前記安全弁が開いた後の電圧上昇挙動を判定するための電圧上昇判定値を予め設定し、
前記ニッケル水素蓄電池の充電中に、前記電圧測定部によって測定された電圧値が、設定した前記電圧上昇判定値以上である場合に、当該ニッケル水素蓄電池の充電を停止する
請求項1又は2に記載のニッケル水素蓄電池の再生方法。 - 前記ニッケル水素蓄電池及び前記充電装置との間には、前記ニッケル水素蓄電池及び前記充電装置を接続及び遮断するスイッチが前記ニッケル水素蓄電池毎に設けられ、
前記ニッケル水素蓄電池には、当該ニッケル水素蓄電池の端子間電圧を測定する電圧測定部が設けられ、
内部短絡が生じた前記ニッケル水素蓄電池の電圧下降の挙動を判定するための電圧下降判定値を予め設定し、
前記ニッケル水素蓄電池の充電中に、前記電圧測定部によって測定された電圧値が、設定した前記電圧下降判定値以下である場合に、当該ニッケル水素蓄電池の充電を停止する
請求項1又は2に記載のニッケル水素蓄電池の再生方法。 - 前記安全弁が開いてから放電リザーブを目標量だけ回復するために要する目標開弁後充電量を予め設定しておき、
全ての前記ニッケル水素蓄電池の前記安全弁が開いてから前記目標開弁後充電量だけ充電を行った後に、全ての前記ニッケル水素蓄電池の充電を停止する
請求項1〜5のいずれか1項に記載のニッケル水素蓄電池の再生方法。 - 前記ニッケル水素蓄電池は、複数の前記単電池を一体化してなり、一体電槽内に隔壁を介して前記単電池を収容し、
前記隔壁に連通孔を設けることによって、過充電状態の前記単電池から発生した酸素ガスを前記連通孔を介して前記一体電槽内で流動させる
請求項1〜6のいずれか1項に記載のニッケル水素蓄電池の再生方法。 - 水素吸蔵合金を負極合剤として有し、電池ケースの内部圧力が所定の圧力以上であるときに開く安全弁を備えたニッケル水素蓄電池の再生装置であって、
1又は複数の単電池を一体化してなるニッケル水素蓄電池が複数並列に接続され、
前記ニッケル水素蓄電池に並列に接続され、電流を供給する充電装置と、
前記充電装置からの電流の供給及び停止を制御する制御装置と、を備え、
前記制御装置は、電流を供給することにより前記ニッケル水素蓄電池を過充電状態として、過充電状態の前記ニッケル水素蓄電池の正極で発生した酸素ガスの少なくとも一部を、前記安全弁を介して前記電池ケース外に排出させて負極の放電リザーブを回復させる
ニッケル水素蓄電池の再生装置。
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JP2014186817A (ja) * | 2013-03-22 | 2014-10-02 | Primearth Ev Energy Co Ltd | ニッケル水素蓄電池の調整方法 |
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