JPH0644490B2 - Metal-hydrogen alkaline storage battery manufacturing method - Google Patents
Metal-hydrogen alkaline storage battery manufacturing methodInfo
- Publication number
- JPH0644490B2 JPH0644490B2 JP1122352A JP12235289A JPH0644490B2 JP H0644490 B2 JPH0644490 B2 JP H0644490B2 JP 1122352 A JP1122352 A JP 1122352A JP 12235289 A JP12235289 A JP 12235289A JP H0644490 B2 JPH0644490 B2 JP H0644490B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- hydrogen
- storage
- metal
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Description
【発明の詳細な説明】 （イ）産業上の利用分野 本発明は、水素を可逆的に吸蔵及び放出することのでき
る水素吸蔵合金電極を負極に備えた、金属−水素アルカ
リ蓄電池の製造方法に関するものである。TECHNICAL FIELD The present invention relates to a method for producing a metal-hydrogen alkaline storage battery in which a negative electrode is equipped with a hydrogen storage alloy electrode capable of reversibly storing and releasing hydrogen. It is a thing.
（ロ）従来の技術 従来から良く用いられる蓄電池としてはニッケル−カド
ミウム蓄電池のごときアルカリ蓄電池、あるいは鉛蓄電
池などがある。近年、これらの電池より軽量且つ高容量
で高エネルギー密度となる可能性のある、水素吸蔵合金
を用いてなる水素吸蔵合金電極を負極に備えた金属−水
素アルカリ蓄電池が注目されている。(B) Conventional technology Conventionally used storage batteries include alkaline storage batteries such as nickel-cadmium storage batteries and lead storage batteries. In recent years, a metal-hydrogen alkaline storage battery having a negative electrode of a hydrogen storage alloy electrode made of a hydrogen storage alloy, which is lighter in weight, higher in capacity and higher in energy density than these batteries, has been receiving attention.
この種電池の負極に用いられる水素吸蔵合金として、例
えば特開昭６３−２１７５０号公報、特開昭６２−２４
６２５９号公報等には希土類系水素吸蔵合金が記載され
ており、この組成を改良することにより、充放電時の合
金耐蝕性の向上及び微粉化の抑制等が計られている。Examples of hydrogen storage alloys used for the negative electrode of this type of battery include, for example, JP-A-63-21750 and JP-A-62-24.
No. 6259 discloses a rare earth-based hydrogen storage alloy, and by improving the composition, the corrosion resistance of the alloy during charging and discharging is improved and the pulverization is suppressed.
また、正極としては、ニッケル−カドミウム蓄電池に用
いられる焼結式ニッケル極などが用いられている。Further, as the positive electrode, a sintered nickel electrode used in a nickel-cadmium storage battery or the like is used.
このようにいて構成された金属−水素アルカリ蓄電池
は、組立後、例えば充放電を繰り返すという化成処理が
必要である。The metal-hydrogen alkaline storage battery configured as described above requires a chemical conversion treatment such as repeating charging and discharging after assembling.
ここで、単にこのような化成処理を施した電池であって
も、初期の放電時の作動電圧が十分得られず、電池の放
電容量が低いという問題があった。Here, there is a problem that even a battery that has been simply subjected to such a chemical conversion treatment cannot obtain a sufficient operating voltage during initial discharge and that the discharge capacity of the battery is low.
この理由は、以下のことに基づくと推定される。即ち、
この種金属−水素アルカリ蓄電池は、負極に水素吸蔵合
金の微粉末を用いており、前記せる化成処理を行うこと
により、水素吸蔵合金が水素を吸蔵、放出し、負極の活
性化が進行する。しかしながら、水素吸蔵合金は極めて
活性であるために、電池缶に組込み密閉するまでに、空
気中で放置されたり、電極作製工程中に加温等されるこ
とにより、前記水素吸蔵合金表面が酸化され、強固な酸
化膜が前記水素吸蔵合金表面上に形成されている。この
酸化膜は、化成中の充放電により部分的に破壊された
り、合金自身が微粉化して清浄な合金表面が露出するこ
とにより、活性化が進むと共に、電池の作動電圧も徐々
に高くなり電池容量が増大すると推察される。従って、
従来の化成処理を完了するためには、低率で充放電を行
うとともに、充放電を数回繰り返す必要があり、電池製
造工程上極めて煩雑となり、化成完了までに多くの時間
を要していた。The reason for this is presumed to be based on the following. That is,
This seed metal-hydrogen alkaline storage battery uses a fine powder of a hydrogen storage alloy for the negative electrode, and by performing the chemical conversion treatment described above, the hydrogen storage alloy stores and releases hydrogen, and the activation of the negative electrode proceeds. However, since the hydrogen-absorbing alloy is extremely active, the surface of the hydrogen-absorbing alloy is oxidized by being left in the air or being heated during the electrode manufacturing process before being assembled and sealed in the battery can. A strong oxide film is formed on the surface of the hydrogen storage alloy. This oxide film is partially destroyed by charging / discharging during formation, or the alloy itself is pulverized to expose a clean alloy surface, so that activation progresses and the operating voltage of the battery gradually rises. It is estimated that the capacity will increase. Therefore,
In order to complete the conventional chemical conversion treatment, it is necessary to charge and discharge at a low rate and repeat the charge and discharge several times, which is extremely complicated in the battery manufacturing process, and it took a lot of time to complete the chemical conversion. .
（ハ）発明が解決しようとする課題 本発明は前記問題点に鑑みなされたものであって、水素
吸蔵合金電極を負極に備えた、金属−水素アルカリ蓄電
池の製造工程中における化成工程の簡略化と、化成処理
後述の初期の電池容量の増大を計ることを課題とし、電
池製造時における好ましい化成条件を提案するものであ
る。(C) Problem to be Solved by the Invention The present invention has been made in view of the above problems, and simplification of a chemical conversion step in a manufacturing step of a metal-hydrogen alkaline storage battery including a hydrogen storage alloy electrode in a negative electrode. The present invention aims to increase the initial battery capacity, which will be described later, and proposes preferable chemical conversion conditions during battery production.
（ニ）課題を解決するための手段 上記目的を達成するための本発明に係る金属−水素アル
カリ蓄電池の製造方法は、水素を可逆的に吸蔵、放出す
る水素吸蔵合金電極を備えた電池を、充電状態において
常温より高い保存温度で保存して自己放電させる、化成
処理のための保存工程を有することを特徴とするもので
ある。(D) Means for Solving the Problems A method for producing a metal-hydrogen alkaline storage battery according to the present invention for achieving the above object is to provide a battery provided with a hydrogen storage alloy electrode that reversibly stores and releases hydrogen. It has a storage step for chemical conversion treatment in which it is stored at a storage temperature higher than room temperature in a charged state and self-discharges.
そして前記保存工程の保存温度としては４０℃以上とす
るのが好ましく、更に、１００℃以下とするのが好適で
ある。The storage temperature in the storage step is preferably 40 ° C. or higher, and more preferably 100 ° C. or lower.
（ホ）作用 水素吸蔵合金の電気化学的な活性化は、合金表面に形成
された酸化膜の破壊と、合金内部からのクラックの発生
により、新しい活性点が生じるという機構で進行するも
のと考えられる。酸化膜の破壊と合金内部からのクラッ
ク発生は、水素の吸蔵、放出によって成されるものであ
り、それらは吸蔵された水素の１回の放出量が多い程生
じやすくなるものと考えられる。(E) Action Electrochemical activation of hydrogen storage alloys is thought to proceed by the mechanism that new active points are generated due to the destruction of the oxide film formed on the alloy surface and the generation of cracks from inside the alloy. To be It is considered that the destruction of the oxide film and the generation of cracks from the inside of the alloy are caused by occlusion and desorption of hydrogen, and they are more likely to occur as the amount of stored hydrogen released at one time increases.
そこで本発明者は、以下の知見に基づき、本発明を完成
するに至ったものである。即ち、充電された状態、言い
換えれば水素を吸蔵した状態での水素吸蔵合金を高温に
すると、 ２ＭＨＨ2＋２Ｍ の平衡が右の方に傾き、水素を放出しやすい状態とな
る。更に、ニッケル極はサイクル初期の状態では、比較
的自己放電が大きく、電池を高温保存することにより、
充電生成物（ＮｉＯＯＨ）が酸素を発生して分解し、電
池缶内に酸素が放出される。この酸素と、水素吸蔵合金
電極表面での水素分子あるいは吸着水素原子とが、反応
し、水素吸蔵合金中の水素の放出を加速的に進行させ、
効果的に水素吸蔵合金電極の化成即ち金属−水素アルカ
リ蓄電池の化成を行うことができる。Therefore, the present inventor has completed the present invention based on the following findings. That is, when the hydrogen storage alloy in a charged state, in other words, a state in which hydrogen is stored, is heated to a high temperature, the equilibrium of 2MHH 2 + 2M is inclined to the right, and hydrogen is easily released. Furthermore, the nickel electrode has a relatively large self-discharge in the initial state of the cycle, and by storing the battery at high temperature,
The charge product (NiOOH) generates oxygen and decomposes, and oxygen is released into the battery can. This oxygen reacts with hydrogen molecules or adsorbed hydrogen atoms on the surface of the hydrogen storage alloy electrode to accelerate the release of hydrogen in the hydrogen storage alloy,
The hydrogen storage alloy electrode, that is, the metal-hydrogen alkaline storage battery can be effectively formed.
そして、水素吸蔵合金電極の活性化即ち化成が効果的に
行われるためには、保存温度４０℃以上とするのが好ま
しいことを種々の実験により知得した。Various experiments have revealed that the storage temperature is preferably 40 ° C. or higher in order to effectively activate the hydrogen storage alloy electrode, that is, chemical conversion.
又、電池の漏液を防止するという観点からは、保存温度
を１００℃以下とするのが望ましい。From the viewpoint of preventing battery leakage, it is desirable that the storage temperature be 100 ° C or lower.
（ヘ）実施例 まず、本発明に用いる金属−水素アルカリ蓄電池の作製
について述べる。組成式ＭｍＮｉ3Ｃｏ1.4Ｍｎ0.6で表
わされる水素吸蔵合金を、高周波炉を用いて各原料を溶
融させることにより得た。この合金を機械的に粉砕し、
平均粒径２０μｍの粉末とした後、ＰＴＦＥディスパー
ジョン３重量％と、水を加えて、ペースト状とした。こ
のペーストを集電体に圧着して水素吸蔵合金電極を得、
この電極と、電極容量が１０００mAhのニッケル正極と
組合わせ、２８重量％のＫＯＨ水溶液を用いて、密閉型
の金属−水素アルカリ蓄電池を得た。(F) Example First, the production of the metal-hydrogen alkaline storage battery used in the present invention will be described. The hydrogen storage alloy represented by the composition formula MmNi 3 Co 1.4 Mn 0.6 was obtained by melting each raw material using a high frequency furnace. Mechanically grind this alloy,
After forming a powder having an average particle size of 20 μm, 3% by weight of PTFE dispersion and water were added to form a paste. This paste is pressed onto a current collector to obtain a hydrogen storage alloy electrode,
This electrode was combined with a nickel positive electrode having an electrode capacity of 1000 mAh, and a 28 wt% KOH aqueous solution was used to obtain a sealed metal-hydrogen alkaline storage battery.
次に、この電池を用い、環境温度２５℃の下で１００mA
で１５時間充電して電池を充電状態とし、第１表に示す
各温度条件にて保存（保存工程）した。保存日数は、１
日間、７日間とし、各条件における電池の漏液の有無に
ついて検討した。この結果を、第１表に示す。Next, using this battery, 100mA under ambient temperature 25 ℃
The battery was charged for 15 hours under the conditions described above to bring the battery into a charged state and stored under each temperature condition shown in Table 1 (storage step). The number of preservation days is 1
The period was set to 7 days, and the presence or absence of leakage of the battery under each condition was examined. The results are shown in Table 1.
第１表において、“○”は漏液が観察されないかったも
の、“×”は漏液が観察されたものをそれぞれ表す。 In Table 1, “◯” indicates that no leakage was observed, and “x” indicates that leakage was observed.
第１表より、１日間の保存においては１２０℃以上、７
日間の保存においては１００℃以上で、電池の漏液が観
察されることがわかる。From Table 1, when stored for 1 day, 120 ° C or higher, 7
It can be seen that battery leakage is observed at 100 ° C. or higher during storage for one day.
次に、これら電池の保存工程において、どの程度、水素
吸蔵合金電極の活性化が進行したかどうかを調べるため
に、各電池の放電容量を比較した。この時の条件は、各
電池を、電池電圧が１．０Ｖに達する迄２００mAで放電
した後、再度１００mAで１５時間充電し、１時間放置
後、今度は５００mAで電池電圧が１．０Ｖに達するまで
放電し、この時の放電容量を調べるというものである。
そして、この放電容量の比較により、水素吸蔵合金電極
の活性化度の評価を行った。尚、これらの操作は、すべ
て２５℃とした。Next, in order to examine to what extent the activation of the hydrogen storage alloy electrode proceeded in the storage process of these batteries, the discharge capacities of the batteries were compared. The condition at this time is to discharge each battery at 200mA until the battery voltage reaches 1.0V, then charge it again at 100mA for 15 hours, leave it for 1 hour, and then at 500mA, the battery voltage reaches 1.0V. It discharges up to and investigates the discharge capacity at this time.
Then, by comparing the discharge capacities, the activation degree of the hydrogen storage alloy electrode was evaluated. All these operations were performed at 25 ° C.
一方、比較例として、電池を高温保存せずに、直ちに電
池電圧が１．０Ｖに達する迄２００mAで放電させたもの
についても、前記同様の評価を行った。この電池におい
ては保存工程がない。On the other hand, as a comparative example, the same evaluation as described above was performed for a battery which was not stored at high temperature and was immediately discharged at 200 mA until the battery voltage reached 1.0V. There is no storage step in this battery.
この結果を、第１図に示す。第１図は、各電池の充電後
における保存温度と、電池の放電容量との関係を示す図
である。The results are shown in FIG. FIG. 1 is a diagram showing the relationship between the storage temperature of each battery after charging and the discharge capacity of the battery.
第１図において、比較例の結果は図示されていないが、
この電池は５３０mAhの放電容量した得られなかった。
これは、負極である水素吸蔵合金電極の活性化が十分に
進行しておらず、電池が未だ負極支配の状態にあること
に起因すると推定される。Although the result of the comparative example is not shown in FIG. 1,
This battery could not be obtained with a discharge capacity of 530 mAh.
It is presumed that this is because the activation of the hydrogen storage alloy electrode, which is the negative electrode, has not progressed sufficiently and the battery is still in the negative electrode dominant state.
これに対し、本発明に係る電池の放電容量は、７００〜
９５０mAhであり、電池組み立て後の初期から、高い放
電容量が得られることが理解される。On the other hand, the discharge capacity of the battery according to the present invention is 700 to
It is 950 mAh, and it is understood that a high discharge capacity can be obtained from the early stage after battery assembly.
保存温度について検討してみると、７日間の保存では４
０℃以上の温度で、その効果が顕著となり、１日間の保
存では特に６０℃以上の温度が適すると考えられる。Considering the storage temperature, 4 days for 7 days storage
The effect becomes remarkable at a temperature of 0 ° C. or higher, and it is considered that a temperature of 60 ° C. or higher is particularly suitable for storage for 1 day.
又、保存温度１００〜１２０℃で保存すると、１日間で
電池の残存容量が全んどなくなる迄自己放電してしま
う。しかしながら、水素吸蔵合金電極の活性化が十分に
進行しており、次のサイクルでは十分な電池放電容量が
得られている。Further, if the battery is stored at a storage temperature of 100 to 120 ° C., the battery will self-discharge within one day until the remaining capacity of the battery is almost completely exhausted. However, the activation of the hydrogen storage alloy electrode has proceeded sufficiently, and a sufficient battery discharge capacity has been obtained in the next cycle.
但し、このような高温で保存すると電池の漏液という問
題が生じてくる。However, storage at such a high temperature causes a problem of battery leakage.
以上の検討結果より、水素吸蔵合金電極の活性化という
観点からは、保存温度を４０℃以上とするのが好まし
く、又、電池の漏液を防止するという観点からは、保存
温度を１００℃以下とするのが好適である。From the above examination results, the storage temperature is preferably 40 ° C. or higher from the viewpoint of activation of the hydrogen storage alloy electrode, and the storage temperature is 100 ° C. or lower from the viewpoint of preventing battery leakage. Is preferred.
本実施例において、電池を充電状態とする方法として、
電池組み立て後通電して充電を行ったものを例示した
が、これ以外に例えば充電状態にある正負極を使用し電
池を組み立てたものを用いても良い。但し、後者の場合
には、正極の充電量をその電極容量の３０％以上とする
のが、本発明の効果を得る上で望ましい。In this embodiment, as a method for putting the battery in a charged state,
An example in which the battery is assembled and then energized to charge the battery is illustrated, but other than this, for example, a battery assembled by using the positive and negative electrodes in a charged state may be used. However, in the latter case, it is desirable that the charged amount of the positive electrode is 30% or more of the electrode capacity in order to obtain the effect of the present invention.
又、水素吸蔵合金としてＭｍＮｉ3Ｃｏ1.4Ｍｎ0.6を用
いたが、これ以外のＭｍＮｉ5、ＭｍＮｉ2Ｃｏ3等の希
土類系水素吸蔵合金、Ｔｉ−Ｎｉ系水素吸蔵合金、Ｔｉ
−Ｍｎ系水素吸蔵合金、Ｔｉ−Ｚｒ系水素吸蔵合金、Ｚ
ｒ−Ｍｎ系水素吸蔵合金等を用いることができるのは言
うまでもない。Although using MmNi 3 Co 1.4 Mn 0.6 as the hydrogen storage alloy, other than this MmNi 5, MmNi 2 Co 3, etc. of the rare-earth-based hydrogen storage alloy, Ti-Ni-based hydrogen storage alloy, Ti
-Mn-based hydrogen storage alloy, Ti-Zr-based hydrogen storage alloy, Z
It goes without saying that an r-Mn-based hydrogen storage alloy or the like can be used.
（ト）発明の効果 以上詳述した如く、本発明の金属−水素アルカリ蓄電池
の製造方法によれば、効率のよい化成条件を提案するこ
とができ、この種電池の初期の電池容量の増大が計れる
ものであり、その工業的価値は極めて大きい。(G) Effect of the Invention As described in detail above, according to the method for producing a metal-hydrogen alkaline storage battery of the present invention, it is possible to propose efficient formation conditions, and increase the initial battery capacity of this type of battery. It is measurable and its industrial value is extremely high.
第１図は電池の保存温度と電池放電容量との関係を示す
図である。FIG. 1 is a diagram showing the relationship between the storage temperature of a battery and the battery discharge capacity.
フロントページの続き (72)発明者 亀岡 誠司 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内 (72)発明者 田所 幹朗 大阪府守口市京阪本通２丁目18番地 三洋 電機株式会社内Front page continuation (72) Inventor Seiji Kameoka 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (72) Inventor Mikiro Tadokoro 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.
Claims (3)
金電極を備えた電池を、充電状態において常温より高い
保存温度で保存して自己放電させる、化成処理のための
保存工程を有することを特徴とする金属−水素アルカリ
蓄電池の製造方法。1. A storage step for chemical conversion treatment, in which a battery provided with a hydrogen storage alloy electrode capable of reversibly storing and releasing hydrogen is stored at a storage temperature higher than room temperature in a charged state and self-discharged. A method for producing a metal-hydrogen alkaline storage battery, comprising:
ある請求項（１）記載の金属−水素アルカリ蓄電池の製
造方法。2. The method for producing a metal-hydrogen alkaline storage battery according to claim 1, wherein the storage temperature in the storage step is 40 ° C. or higher.
である請求項（２）記載の金属−水素アルカリ蓄電池の
製造方法。3. The method for producing a metal-hydrogen alkaline storage battery according to claim 2, wherein the storage temperature in the storage step is 100 ° C. or lower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122352A JPH0644490B2 (en) | 1989-05-16 | 1989-05-16 | Metal-hydrogen alkaline storage battery manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122352A JPH0644490B2 (en) | 1989-05-16 | 1989-05-16 | Metal-hydrogen alkaline storage battery manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02301971A JPH02301971A (en) | 1990-12-14 |
| JPH0644490B2 true JPH0644490B2 (en) | 1994-06-08 |
Family
ID=14833799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1122352A Expired - Lifetime JPH0644490B2 (en) | 1989-05-16 | 1989-05-16 | Metal-hydrogen alkaline storage battery manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0644490B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018456A (en) * | 2019-05-31 | 2020-12-01 | 朴力美电动车辆活力株式会社 | Method for manufacturing secondary battery and nickel-hydrogen secondary battery |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2074159C (en) * | 1992-07-17 | 1997-11-11 | Jun Furukawa | Method of manufacturing a sealed type nickel-hydrogen cell |
| EP0696825B1 (en) | 1994-08-09 | 2004-02-04 | Japan Storage Battery Company Limited | Method for manufacturing nickel-metal-hydride battery |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63131467A (en) * | 1986-11-19 | 1988-06-03 | Sanyo Electric Co Ltd | Metal-hydrogen alkaline storage battery |
| JPS63261676A (en) * | 1987-04-20 | 1988-10-28 | Sanyo Electric Co Ltd | Enclosed type nickel-hydrogen secondary battery |
| JPH0693358B2 (en) * | 1987-04-21 | 1994-11-16 | 松下電器産業株式会社 | Manufacturing method of hydrogen storage electrode |
| JPH01161674A (en) * | 1987-12-17 | 1989-06-26 | Matsushita Electric Ind Co Ltd | Manufacturing method of alkaline secondary battery using hydrogen storage alloy |
| JP2512076B2 (en) * | 1988-04-19 | 1996-07-03 | 松下電器産業株式会社 | Manufacturing method of sealed nickel-metal hydride storage battery |
-
1989
- 1989-05-16 JP JP1122352A patent/JPH0644490B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018456A (en) * | 2019-05-31 | 2020-12-01 | 朴力美电动车辆活力株式会社 | Method for manufacturing secondary battery and nickel-hydrogen secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02301971A (en) | 1990-12-14 |
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