JPH05290877A - Nickel hydrogen storage battery - Google Patents
Nickel hydrogen storage batteryInfo
- Publication number
- JPH05290877A JPH05290877A JP4110703A JP11070392A JPH05290877A JP H05290877 A JPH05290877 A JP H05290877A JP 4110703 A JP4110703 A JP 4110703A JP 11070392 A JP11070392 A JP 11070392A JP H05290877 A JPH05290877 A JP H05290877A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- hydrogen storage
- nickel
- storage alloy
- positive 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.)
- Withdrawn
Links
Classifications
-
- 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
Landscapes
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ニッケル水素蓄電池に
係わり、さらに詳しくは負極の折り曲げによる水素吸蔵
合金の脱落を防止したニッケル水素蓄電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nickel-hydrogen storage battery, and more particularly to a nickel-hydrogen storage battery in which the hydrogen storage alloy is prevented from falling off when the negative electrode is bent.
【０００２】[0002]
【従来の技術】従来、蓄電池としては、ニッケル／カド
ミウム蓄電池や鉛蓄電池などがよく用いられていた。2. Description of the Related Art Conventionally, nickel / cadmium storage batteries and lead storage batteries have been often used as storage batteries.
【０００３】しかし、最近は、それらより高容量でかつ
高エネルギー密度になる可能性を有した水素吸蔵合金を
負極活物質として用いたニッケル水素蓄電池が注目され
ている。However, recently, attention has been paid to a nickel-hydrogen storage battery using as a negative electrode active material a hydrogen storage alloy having a higher capacity and a higher energy density than those mentioned above.
【０００４】このニッケル水素蓄電池では、負極の水素
吸蔵合金の充填密度を高くして容量を高めるため、水素
吸蔵合金粉末をたとえば平織金網やエキスパンドメタル
などの金属多孔体からなる基体に高圧のロールプレスで
圧着することによって負極を作製する、いわゆる圧着式
による負極の作製方法が好まれている。In this nickel-metal hydride storage battery, in order to increase the packing density of the hydrogen storage alloy of the negative electrode and increase the capacity, the hydrogen storage alloy powder is subjected to high-pressure roll pressing on a substrate made of a metal porous body such as plain weave wire mesh or expanded metal. A so-called pressure-bonding method for manufacturing a negative electrode is preferred, in which the negative electrode is manufactured by pressure bonding.
【０００５】そして、このニッケル水素蓄電池では、電
池の体積当りの容量密度を高めるため、上記負極をＵ字
状に折り曲げ、その負極の間にセパレータを介して正極
を配置する構成をとっているが、負極の折り曲げ時に水
素吸蔵合金層に亀裂が入って水素吸蔵合金が脱落し、短
絡を引き起こしたり、容量を低下させるという問題があ
った。In this nickel-metal hydride storage battery, in order to increase the capacity density per volume of the battery, the negative electrode is bent in a U shape, and the positive electrode is arranged between the negative electrodes via a separator. However, when the negative electrode is bent, the hydrogen storage alloy layer is cracked and the hydrogen storage alloy falls off, which causes a short circuit or a decrease in capacity.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記のよう
な従来のニッケル水素蓄電池における問題点を解決し、
負極の折り曲げ時の水素吸蔵合金の脱落を防止して、水
素吸蔵合金の脱落に基づく短絡発生や容量低下が生じな
いニッケル水素蓄電池を提供することを目的とする。DISCLOSURE OF THE INVENTION The present invention solves the problems in the conventional nickel metal hydride storage battery as described above,
It is an object of the present invention to provide a nickel-hydrogen storage battery that prevents the hydrogen storage alloy from falling off when the negative electrode is bent, and does not cause a short circuit or a decrease in capacity due to the drop of the hydrogen storage alloy.
【０００７】[0007]
【課題を解決するための手段】本発明は、負極の折り曲
げ部に水素吸蔵合金を配置させず、負極の折り曲げ部を
基体だけで構成することによって、上記目的を達成した
ものである。DISCLOSURE OF THE INVENTION The present invention has achieved the above object by forming a bent portion of a negative electrode only with a substrate without disposing a hydrogen storage alloy in the bent portion of a negative electrode.
【０００８】すなわち、負極の折り曲げ部を基体だけで
構成しているので、折り曲げやすい上に、水素吸蔵合金
が配置していないので水素吸蔵合金の脱落がなく、した
がって水素吸蔵合金の脱落に基づく短絡発生や容量低下
が生じない。That is, since the bent portion of the negative electrode is composed only of the substrate, it is easy to bend, and since the hydrogen storage alloy is not arranged, the hydrogen storage alloy does not fall off, and therefore a short circuit due to the drop of the hydrogen storage alloy occurs. Occurrence and capacity reduction do not occur.
【０００９】本発明のニッケル水素蓄電池において、正
極の活物質として用いる金属酸化物や金属水酸化物とし
ては、その代表的なものとして、たとえば一酸化ニッケ
ル（ＮｉＯ）、二酸化ニッケル（ＮｉＯ2 ）、水酸化ニ
ッケル〔Ｎｉ（ＯＨ）2 〕などが挙げられる。ただし、
これらは正極が放電状態にある場合であり、正極が充電
状態にある場合には上記金属酸化物や金属水酸化物は別
の化合物として存在する。In the nickel-metal hydride storage battery of the present invention, typical examples of the metal oxide and metal hydroxide used as the positive electrode active material include nickel monoxide (NiO) and nickel dioxide (NiO 2 ). Examples thereof include nickel hydroxide [Ni (OH) 2 ]. However,
These are cases where the positive electrode is in a discharged state, and when the positive electrode is in a charged state, the above metal oxide or metal hydroxide exists as another compound.
【００１０】負極の活物質として用いる水素吸蔵合金と
しては、たとえば実施例で用いるＴｉＺｒＶＮｉＣｒ系
のものをはじめ、ＬａＺｒＮｉＡｌ系、ＴｉＮｉ系、Ｔ
ｉＮｉＺｒ系、ＭｍＮｉ5 系のものなど、各種の水素吸
蔵合金が挙げられる。The hydrogen storage alloy used as the active material of the negative electrode includes, for example, the TiZrVNiCr-based alloys used in the examples, LaZrNiAl-based, TiNi-based, and T-based alloys.
Various hydrogen storage alloys such as iNiZr-based and MmNi 5 -based alloys can be used.
【００１１】電解液はアルカリ水溶液で構成されるが、
このアルカリ水溶液としては、たとえば水酸化ナトリウ
ム、水酸化カリウム、水酸化リチウムなどのアルカリ金
属の水酸化物の水溶液が用いられる。The electrolytic solution is composed of an alkaline aqueous solution,
As the alkaline aqueous solution, for example, an aqueous solution of an alkali metal hydroxide such as sodium hydroxide, potassium hydroxide or lithium hydroxide is used.
【００１２】[0012]
【実施例】以下、本発明の実施例を図面を参照しつつ説
明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１は本発明のニッケル水素蓄電池の一実
施例を示す断面図である。図１において、１は正極であ
り、この正極１には活物質として水酸化ニッケル（ただ
し、放電時で、充放電にはオキシ水酸化ニッケルにな
る）を含む公知の焼結式ニッケル電極が用いられてい
る。FIG. 1 is a sectional view showing an embodiment of the nickel-hydrogen storage battery of the present invention. In FIG. 1, reference numeral 1 is a positive electrode, and a known sintered nickel electrode containing nickel hydroxide as an active material (however, it becomes nickel oxyhydroxide for charging and discharging at the time of discharging) is used for this positive electrode 1. Has been.
【００１４】２は負極で、この負極２はニッケル製のエ
キスパンドメタルに水素吸蔵合金粉末を高圧のロールプ
レスで圧着することによってシート状に作製されたもの
である。Reference numeral 2 is a negative electrode, and this negative electrode 2 is produced in the form of a sheet by pressure-bonding a hydrogen storage alloy powder to an expanded metal made of nickel by a high pressure roll press.
【００１５】３はポリアミド不織布からなるセパレータ
であり、前記負極２はＵ字状に折り曲げられ、その負極
２の間にセパレータ３を介して正極１を配置し、それを
主体として電極群４としている。Reference numeral 3 is a separator made of polyamide nonwoven fabric. The negative electrode 2 is bent in a U shape, and the positive electrode 1 is arranged between the negative electrodes 2 with the separator 3 interposed therebetween, and the negative electrode 2 is mainly used as an electrode group 4. ..
【００１６】そして、上記負極２の折り曲げ部は水素吸
蔵合金を配置させずに基体２ａだけで構成されている。
なお、負極２の折り曲げ部以外の部分は基体に水素吸蔵
合金粉末を圧着することによって作製されているので、
折り曲げ部以外の部分にも基体が存在するが、図１では
それらの部分における基体は図示せず、水素吸蔵合金が
配置していない折り曲げ部のみ基体を図示し、それを２
ａで示している。The bent portion of the negative electrode 2 is composed of only the substrate 2a without the hydrogen storage alloy.
Since the portion other than the bent portion of the negative electrode 2 is manufactured by press-bonding the hydrogen storage alloy powder to the base,
Although the base exists also in the portion other than the bent portion, the base in those portions is not shown in FIG. 1, and only the bent portion in which the hydrogen storage alloy is not arranged is shown.
It is indicated by a.
【００１７】上記電極群４は電池ケース５内に収容さ
れ、電池ケース５の上部中央部には絶縁ガスケット９を
介して正極端子台６が取り付けられ、該正極端子台６は
中央に透孔を有し、その上部にはキャップ７が取り付け
られ、キャップ７内にはゴム製の弾性弁体８が適度な圧
縮状態で装填されている。The electrode group 4 is housed in a battery case 5, and a positive electrode terminal block 6 is attached to an upper center portion of the battery case 5 through an insulating gasket 9. The positive electrode terminal block 6 has a through hole in the center. A cap 7 is attached to an upper portion of the cap 7, and an elastic valve body 8 made of rubber is loaded in the cap 7 in an appropriately compressed state.
【００１８】正極１は正極リード体１０によって正極端
子台６に電気的に接続され、負極２は電池ケース５の内
周面に直接接触することによって電気的に接続されてい
る。そして、この電池には濃度３０重量％の水酸化カリ
ウム水溶液に水酸化リチウムを１７ｇ／ｌ添加したもの
が電解液として１ｍｌ注入されている。The positive electrode 1 is electrically connected to the positive electrode terminal block 6 by the positive electrode lead body 10, and the negative electrode 2 is electrically connected by directly contacting the inner peripheral surface of the battery case 5. Then, 1 ml of an electrolyte obtained by adding 17 g / l of lithium hydroxide to a potassium hydroxide aqueous solution having a concentration of 30% by weight is injected into this battery.
【００１９】上記のように、この電池では、キャップ７
と正極端子台６との間に弾性弁体８が圧縮装填されてい
るので、通常時は上記弾性弁体８が正極端子台６の透孔
を閉塞して密閉状態に保たれているが、電池内圧が上昇
したときにはその圧力上昇によって弾性弁体８が変形し
て、キャップ７に設けられたガス抜き孔１３からガスを
電池外部に放出して、電池内圧を下げ、安全性が確保さ
れるように構成されている。As described above, in this battery, the cap 7
Since the elastic valve element 8 is compression-loaded between the positive electrode terminal block 6 and the positive electrode terminal block 6, the elastic valve element 8 normally closes the through hole of the positive electrode terminal block 6 and is kept in a sealed state. When the battery internal pressure rises, the elastic valve body 8 is deformed due to the pressure increase, and gas is discharged to the outside of the battery from the gas vent hole 13 provided in the cap 7, thereby lowering the battery internal pressure and ensuring safety. Is configured.
【００２０】上記構成のニッケル水素蓄電池は以下のよ
うにして作製される。The nickel-metal hydride storage battery having the above structure is manufactured as follows.
【００２１】まず、組成がＺｒ15Ｖ22Ｔｉ15Ｎｉ39Ｃｒ
7 で示される水素吸蔵合金の粉末をニッケル製のエキス
パンドメタルからなる基体に高圧のロールプレスで圧着
し、これを長さ８０ｍｍ、幅１５ｍｍの長方形状に切断
する。そして、その際、長さ方向の中央部の長さ２ｍｍ
の部分には水素吸蔵合金粉末を圧着しないで基体だけに
する。このようにして負極２が作製される。図１におけ
る２ａは負極２の基体である。First, the composition is Zr 15 V 22 Ti 15 Ni 39 Cr.
The powder of the hydrogen storage alloy shown by 7 is pressed onto a base made of expanded metal made of nickel by a high-pressure roll press, and cut into a rectangular shape having a length of 80 mm and a width of 15 mm. And at that time, the length of the central portion in the length direction is 2 mm.
The hydrogen-absorbing alloy powder is not pressure-bonded to the portion of, but only the substrate is formed. In this way, the negative electrode 2 is manufactured. Reference numeral 2a in FIG. 1 is a base body of the negative electrode 2.
【００２２】これとは別に、長さ３８ｍｍ、幅１５ｍｍ
に切断された正極１をセパレータ３で包み、これを負極
２の中央部から一方の端部にかけて配置し、負極２の中
央部つまり基体だけの部分をＵ字状に折り曲げてセパレ
ータ３を介して正極１を負極２で挟む。その後、正極１
と負極２がセパレータ３を介して対向するように並べて
電極群４を作製し、該電極群４を電池ケース５内に挿入
し、正極リード体１０と正極端子台６とを接続し、電解
液を注入した後、電池ケース５の開口部に封止板１１を
挿入し、その周囲をシーム溶接して封止する。１２はそ
のシーム溶接部である。Separately, length 38 mm, width 15 mm
The positive electrode 1 cut into pieces is wrapped with a separator 3, which is arranged from the central portion of the negative electrode 2 to one end thereof, and the central portion of the negative electrode 2, that is, only the base portion is bent into a U shape, and the separator 3 is interposed therebetween. The positive electrode 1 is sandwiched between the negative electrodes 2. After that, the positive electrode 1
And the negative electrode 2 are arranged so as to face each other with the separator 3 interposed therebetween to form an electrode group 4, the electrode group 4 is inserted into the battery case 5, and the positive electrode lead body 10 and the positive electrode terminal block 6 are connected to each other to form an electrolytic solution. After the injection, the sealing plate 11 is inserted into the opening of the battery case 5, and the periphery thereof is seam-welded and sealed. 12 is the seam weld.
【００２３】比較のため、従来技術にしたがって基体の
中央部にも水素吸蔵合金粉末を圧着した負極を作製し、
この従来例の負極と上記実施例の負極をＵ字状に折り曲
げ、水素吸蔵合金の脱落による重量減少を調べた。その
結果を表１に示す。For comparison, according to the prior art, a negative electrode was prepared by pressing the hydrogen-absorbing alloy powder on the central portion of the substrate,
The negative electrode of the conventional example and the negative electrode of the above-mentioned example were bent in a U shape, and the weight reduction due to the dropping of the hydrogen storage alloy was examined. The results are shown in Table 1.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１に示すように、実施例の負極には重量
減少が認められなかったが、従来例の負極には０．０９
０ｇの減少が認められ、負極の折り曲げにより水素吸蔵
合金が脱落していることがわかる。As shown in Table 1, no weight loss was observed in the negative electrode of the example, but 0.09 in the negative electrode of the conventional example.
A decrease of 0 g was observed, which shows that the hydrogen storage alloy was dropped off due to the bending of the negative electrode.
【００２６】[0026]
【発明の効果】以上説明したように、本発明では、負極
の折り曲げ部に水素吸蔵合金を配置させず、負極の折り
曲げ部を基体だけで構成することによって、負極の折り
曲げによる水素吸蔵合金の脱落を少なくすることができ
た。As described above, according to the present invention, the hydrogen storage alloy is not disposed in the bent portion of the negative electrode, and the bent portion of the negative electrode is composed of only the substrate. Could be reduced.
【００２７】そして、その結果、負極から脱落した水素
吸蔵合金に基づく短絡発生や容量低下を防止することが
できるようになった。As a result, it has become possible to prevent the occurrence of a short circuit and the reduction in capacity due to the hydrogen storage alloy dropped from the negative electrode.
【図１】本発明のニッケル水素蓄電池の一実施例を示す
断面図である。FIG. 1 is a sectional view showing an embodiment of a nickel-hydrogen storage battery of the present invention.
１ 正極 ２ 負極 ２ａ 基体 ３ セパレータ ４ 電極群 ５ 電池ケース 1 Positive electrode 2 Negative electrode 2a Substrate 3 Separator 4 Electrode group 5 Battery case
Claims (1)
を活物質として含む正極１、水素吸蔵合金を活物質とし
て含む負極２、セパレータ３およびアルカリ水溶液から
なる電解液を備え、上記負極２をＵ字状に折り曲げ、そ
の負極２の間にセパレータ３を介して正極１を配置する
ニッケル水素蓄電池において、上記負極２の折り曲げ部
に水素吸蔵合金を配置せずに、負極２の折り曲げ部を基
体２ａだけで構成したことを特徴とするニッケル水素蓄
電池。1. A negative electrode 2 comprising a positive electrode 1 containing nickel oxide or nickel hydroxide as an active material, a negative electrode 2 containing a hydrogen storage alloy as an active material, a separator 3 and an alkaline aqueous solution, wherein the negative electrode 2 is U-shaped. In a nickel-metal hydride storage battery in which the positive electrode 1 is arranged between the negative electrodes 2 with the separator 3 interposed therebetween, a bent part of the negative electrode 2 is formed only by the base body 2a without disposing a hydrogen storage alloy in the bent part of the negative electrode 2. A nickel-metal hydride storage battery characterized by being configured with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4110703A JPH05290877A (en) | 1992-04-02 | 1992-04-02 | Nickel hydrogen storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4110703A JPH05290877A (en) | 1992-04-02 | 1992-04-02 | Nickel hydrogen storage battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05290877A true JPH05290877A (en) | 1993-11-05 |
Family
ID=14542320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4110703A Withdrawn JPH05290877A (en) | 1992-04-02 | 1992-04-02 | Nickel hydrogen storage battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05290877A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772251A1 (en) * | 1995-11-06 | 1997-05-07 | VARTA Batterie Aktiengesellschaft | Galvanic cell with electrode current collectors in the form of wires |
-
1992
- 1992-04-02 JP JP4110703A patent/JPH05290877A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0772251A1 (en) * | 1995-11-06 | 1997-05-07 | VARTA Batterie Aktiengesellschaft | Galvanic cell with electrode current collectors in the form of wires |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990608 |