JPH04162353A - Seal alkaline secondary battery - Google Patents
Seal alkaline secondary batteryInfo
- Publication number
- JPH04162353A JPH04162353A JP2286221A JP28622190A JPH04162353A JP H04162353 A JPH04162353 A JP H04162353A JP 2286221 A JP2286221 A JP 2286221A JP 28622190 A JP28622190 A JP 28622190A JP H04162353 A JPH04162353 A JP H04162353A
- Authority
- JP
- Japan
- Prior art keywords
- hydrogen storage
- storage alloy
- negative electrode
- hydrogen
- secondary battery
- 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.)
- Granted
Links
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 62
- 239000000956 alloy Substances 0.000 claims abstract description 62
- 239000001257 hydrogen Substances 0.000 claims abstract description 60
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000005871 repellent Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000002940 repellent Effects 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005245 sintering Methods 0.000 claims 1
- 239000002904 solvent Substances 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 abstract description 6
- 230000006866 deterioration Effects 0.000 abstract 2
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 229910001882 dioxygen Inorganic materials 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000012300 argon atmosphere Substances 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- QLSSITLVZFHSJT-UHFFFAOYSA-N 1-(3-chlorophenyl)-n-methylpropan-2-amine Chemical compound CNC(C)CC1=CC=CC(Cl)=C1 QLSSITLVZFHSJT-UHFFFAOYSA-N 0.000 description 1
- 229910000878 H alloy Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000036647 reaction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、水素吸蔵合金負極を用いた密閉形アルカリ二
次電池の、急速充電時における内部圧力の上昇防止に関
するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to prevention of an increase in internal pressure during rapid charging of a sealed alkaline secondary battery using a hydrogen storage alloy negative electrode.
従来の技術
水素吸蔵合金負極を用いた密閉形アルカリ二次電池にお
けや充電時の内部圧力の上昇は、（イ）正極において発
生した酸素ガスに起因するものと（ロ）負極において充
電反応の副反応によって発生する水素ガスに起因ｆるも
のの二種類がある。Conventional technology In a sealed alkaline secondary battery using a hydrogen storage alloy negative electrode, the increase in internal pressure during charging is due to (a) oxygen gas generated at the positive electrode and (b) charging reaction at the negative electrode. There are two types of reactions caused by hydrogen gas generated by side reactions.
１イ）に対する対策としては、正極から発生した酸素ガ
スを充電不十分の負極の表面で局部電池反応により消費
する方法が一般的であり、このために、負極の容量を正
極の容量よりも大きくするいわゆる充電リザーブを設け
ることが普通である。（ロ）に対する対策としては、水
素の吸蔵・放出平衡圧力が低い水素吸蔵合金を使用する
ことが一般的であり、基本となる水素吸蔵合金に種々の
元素を添加するのが普通である。たとえば、希土類系の
ＡＢ５型水素吸蔵合金の場合、アルミニウムやマンガン
、コバルト、ジルコニウムなどを添加する。As a countermeasure against 1), a common method is to consume the oxygen gas generated from the positive electrode through a local battery reaction on the surface of the insufficiently charged negative electrode. It is common to provide a so-called charge reserve. As a countermeasure against (b), it is common to use a hydrogen storage alloy with a low equilibrium pressure for absorbing and releasing hydrogen, and it is common to add various elements to the basic hydrogen storage alloy. For example, in the case of a rare earth AB5 type hydrogen storage alloy, aluminum, manganese, cobalt, zirconium, etc. are added.
しかしながら、数分ないし数十分で完了する急速充電時
には、局部電池反応による酸素ガスの吸収が間に合わな
いばかりでなく、負極の充電反応の副反応である水素ガ
ス発生反応がおこり、主として水素ガスによる電池内圧
力の上昇がおこる。However, during rapid charging, which can be completed in several minutes to tens of minutes, not only is the absorption of oxygen gas due to local cell reactions insufficient, but also a hydrogen gas generation reaction, which is a side reaction of the negative electrode charging reaction, occurs, and the hydrogen gas is mainly used. Pressure inside the battery increases.
この内部圧力の上昇を防止３”るためには、上述のよう
に水素吸蔵合金に種々の元素を添加するだけではなく、
水素吸蔵合金負極中のガスの拡散速度を大きくして、水
素吸蔵合金への水素ガスの吸蔵を促進する必要がある。In order to prevent this increase in internal pressure, it is necessary not only to add various elements to the hydrogen storage alloy as described above, but also to
It is necessary to increase the diffusion rate of gas in the hydrogen storage alloy negative electrode to promote storage of hydrogen gas in the hydrogen storage alloy.
水素吸蔵合金負極中のガスの拡散を阻害する大きな要因
として、電解液による液膜が水素吸蔵合金表面を被うと
いう点がある。この点を改善するため、主として局部電
池反応による酸素ガス吸収の促進を目的として、（ａ）
水素吸蔵合金負極をフッ素樹脂ディスバージョンに浸漬
して表面に撥水性をもたせる方法（特開昭６２−１３９
２５５号公報）および（ｂｌ水素吸蔵合金粉末を）′ツ
素樹脂により撥水処理したのち、親水性のバインダーを
もちいてペースト状とし、基体に充填して水素吸蔵合金
負極とする方法（特開平１−２６７９６０号公報）が提
案されている。すなわち、水素吸蔵合金表面が電解液に
よる液膜ｉこ覆われて水素ガスの拡散が阻害されること
を防ぎ、抗水性と親水性のバランスのもとに三相界面を
形成して主として酸素ガスの吸収を促進しようとするも
のである。A major factor that inhibits the diffusion of gas in the hydrogen storage alloy negative electrode is that the surface of the hydrogen storage alloy is covered with a liquid film formed by the electrolyte. In order to improve this point, (a)
Method of imparting water repellency to the surface by immersing a hydrogen storage alloy negative electrode in fluororesin dispersion (Japanese Unexamined Patent Publication No. 62-139
No. 255) and (Japanese Patent Application Laid-Open No. 255-255), a method in which (bl hydrogen storage alloy powder) is treated with a water-repellent resin, made into a paste using a hydrophilic binder, and filled into a substrate to form a hydrogen storage alloy negative electrode. 1-267960) has been proposed. In other words, the surface of the hydrogen storage alloy is prevented from being covered with a liquid film by the electrolytic solution, which inhibits the diffusion of hydrogen gas, and a three-phase interface is formed with a balance between water resistance and hydrophilicity, which mainly absorbs oxygen gas. The aim is to promote the absorption of
発明が解決しようとする課題
しかしながら、（ａｌの方法では、水素合金負極表面の
全体に撥水性が付与されるため、また、（ｂｌの方法で
は、水素合金負極を構成している全ての水素吸蔵合金粉
末の表面撥水性が付与されるため、電解液と接触する部
分すなわち充放電の電気化学反応に寄与する部分の実効
的な面積が小さくなる結果となり、電池の充放電特性、
特に放電性を損なう結果となる。Problems to be Solved by the Invention However, in the method (al), water repellency is imparted to the entire surface of the hydrogen alloy negative electrode; Since the surface of the alloy powder is imparted with water repellency, the effective area of the part that comes into contact with the electrolyte, that is, the part that contributes to the electrochemical reaction of charging and discharging, becomes smaller, which reduces the charging and discharging characteristics of the battery.
In particular, this results in impaired discharge performance.
課題を解決するだめの手段
このような問題を解決するため、本発明においては、負
極を構成Ｔる水素吸蔵合金として二種類のものを混合し
てもちい、急速充電時における水素ガス吸収に係わる部
分にのみ撥水処理することにより、電解液による液膜の
形成を阻害し水素ガスの拡散を促進するものである。す
なわち、過充電および急速充電時に寄与する、いわゆる
充電リザーブに相当する部分には表面に撥水処理を施し
て電解液に接触しないようにした第一の水素吸蔵合金を
もちい、通常の充放電に寄与する部分には水素吸蔵合金
負極に普通に用いられる第二の水素吸蔵合金をもちいる
ものである。また、これらの組合わせの効果をより実用
的なものにするために−ζ−
上記第一の水素吸蔵合金として、水素の吸蔵・放出平衡
圧力が上記第二の水素吸蔵合金のそれよりも大きなもの
を用いるものである。Means to Solve the Problems In order to solve these problems, in the present invention, two types of hydrogen storage alloys are used as the hydrogen storage alloy constituting the negative electrode, and the portion involved in hydrogen gas absorption during rapid charging is mixed. By applying water-repellent treatment only to the electrolyte, the formation of a liquid film by the electrolyte is inhibited and the diffusion of hydrogen gas is promoted. In other words, the part corresponding to the so-called charge reserve that contributes to overcharging and rapid charging uses the first hydrogen storage alloy whose surface is treated with water repellent treatment to prevent it from coming into contact with the electrolyte, and is used for normal charging and discharging. The contributing portion uses a second hydrogen storage alloy that is commonly used in hydrogen storage alloy negative electrodes. In addition, in order to make the effect of these combinations more practical -ζ- As the first hydrogen storage alloy, the hydrogen storage/release equilibrium pressure is higher than that of the second hydrogen storage alloy. It is something that uses things.
作用
これにより、水素吸蔵合金を負極に用いる密閉形アルカ
リ二次電池において、放電特性を損なうことなく急速充
電時の水素ガスの発生Ｃζよる電池内圧力の上昇を防止
することができる。As a result, in a sealed alkaline secondary battery using a hydrogen storage alloy for the negative electrode, it is possible to prevent an increase in the internal pressure of the battery due to the generation of hydrogen gas Cζ during rapid charging without impairing the discharge characteristics.
実施例 本発明の一実施例を説明する。Example An embodiment of the present invention will be described.
水素吸蔵合金として、以下の［Ａ］と〔Ｂ〕の合金を用
意した。The following alloys [A] and [B] were prepared as hydrogen storage alloys.
（Ａ） Ｍｍ−Ｎ ｉ −Ａ を系合金。組成比（モ
ル比） ′はＭｍ：Ｎｉ：Ａｔ＝１：４．５：Ｏ−
５゜ただし、Ｍｍはミツシュメタルである。(A) Mm-N i -A based alloy. Composition ratio (molar ratio) ' is Mm:Ni:At=1:4.5:O-
5゜However, Mm is Mitsushi metal.
［Ｂ］ Ｍｍ−Ｎ ｉ −Ｃｏ −Ｍ ｎ−Ａ ｌ系
合金。組３．６：０．６’：０．５：０．３である。こ
れらの合金のＰＴＣ線図を第４図に示す。第３図から、
水素の吸蔵・放出平衡圧力は［Ｂ］よりも（Ａ）の方６
一
が大きいことがわかる。これらの合金を用いて、ＡＡ型
の密閉形アルカリ二次電池を組立てた。それぞれの水素
吸蔵合金は、５０初／−の高圧水素雰囲気と真空雰囲気
を交互に繰返すいわゆる水素化粉砕により粉末とした。[B] Mm-Ni-Co-Mn-A1 alloy. The set is 3.6:0.6':0.5:0.3. The PTC diagrams of these alloys are shown in FIG. From Figure 3,
The hydrogen absorption and release equilibrium pressure is higher in (A) than in [B]6
It turns out that one is larger. Using these alloys, an AA type sealed alkaline secondary battery was assembled. Each hydrogen storage alloy was made into powder by so-called hydrogen pulverization in which a high-pressure hydrogen atmosphere and a vacuum atmosphere of 50 mm/- were alternately repeated.
次に第一の水素吸蔵合金の撥水処理の方法を記す。水素
化粉砕した水素吸蔵合金粉末を、１５％のポリテトラフ
ルオロエチレン（以下、ＦＴＦＢと記す）を含むＰＴＦ
’Ｅディスバージョンとともに混練し、乾燥させたのち
アルゴン雰囲気中で３５０℃で焼成した。これをさらに
アルゴン雰囲気中で粉砕した粉末を用いた。第二の水素
吸蔵合金粉末としては、水素化粉砕しただけのものを用
いた。これらの水素吸蔵合金粉末を、ＰＶＡ水溶液とと
もに混練してペースト状とし、発泡ニッケル基体に充填
して乾燥後６トン／ｃＩＩｉでプレスしたものを水素吸
蔵合金負極とした。これらの水素負極と通常のニッケル
・カドミウム電池に用いられているニッケル正極と組合
わせて以下に示す６種類のＡＡ型の密閉形アルカリ二次
電池を組立てた。Next, a method for water-repellent treatment of the first hydrogen storage alloy will be described. PTF containing 15% polytetrafluoroethylene (hereinafter referred to as FTFB)
The mixture was kneaded with E-disversion, dried, and then fired at 350°C in an argon atmosphere. A powder obtained by further pulverizing this in an argon atmosphere was used. As the second hydrogen storage alloy powder, one that had just been hydrogenated and ground was used. These hydrogen storage alloy powders were kneaded with a PVA aqueous solution to form a paste, filled into a foamed nickel substrate, dried, and pressed at 6 tons/cIIi to obtain a hydrogen storage alloy negative electrode. Six types of AA type sealed alkaline secondary batteries shown below were assembled by combining these hydrogen negative electrodes with a nickel positive electrode used in ordinary nickel-cadmium batteries.
■ 第一の水素吸蔵合金として（Ａ）を３Ｑｗｔ％使用
し、第二の水素吸蔵合金として（Ｂ）を７９ｗｔ％使用
した。(2) 3Qwt% of (A) was used as the first hydrogen storage alloy, and 79wt% of (B) was used as the second hydrogen storage alloy.
■ 第一の水素吸蔵合金として（Ａ）を５Ｑｗｔ％使用
し、第二の水素吸蔵合金として（Ｈ）を５０ｗｔ％使用
した。(2) 5Qwt% of (A) was used as the first hydrogen storage alloy, and 50wt% of (H) was used as the second hydrogen storage alloy.
■ 第一の水素吸蔵合金として〔」３〕を３Ｑｗｔ％使
用し、第二の水素吸蔵合金として〔Ｂ〕を７０ｗｔ％使
用した。(3) 3Qwt% of [3] was used as the first hydrogen storage alloy, and 70wt% of [B] was used as the second hydrogen storage alloy.
■ 撥水処理をしていないＣＢ）のみを使用した。■ Only CB (without water repellent treatment) was used.
■ ■と同じ電極を、引例（ａｌに従ってＰ ’１’
Ｐ Ｅディスバージョンに浸漬して撥水処理した。■ The same electrode as ■ is used as P '1' according to the reference (al).
It was soaked in PE dispersion to make it water repellent.
■ 水素吸蔵合金としてＣＢ）を用い、引例（ｂｌに従
って水素吸蔵合金負極を作製した。(2) Using CB as the hydrogen storage alloy, a hydrogen storage alloy negative electrode was prepared according to the reference example (bl).
なお、いずれの電池も、負極の容量（低率放電容量）は
正極の容量に対して１．５倍となるようにした。In addition, in each battery, the capacity of the negative electrode (low rate discharge capacity) was set to be 1.5 times the capacity of the positive electrode.
これらの電池を５ＣｍＡで１５分間充電する急未形の電
池である■にくらべ、■〜■および■、■はいずれも内
部圧力の上昇が少なく、その効果は■が最も大きく、つ
いで■、■、■、■の順であることがわかった。一方、
第２図は■〜■および■、■の電池を５０ｍＡ・１５分
間の充電と３ＣｍＡの完全放電を繰返丁急速充電−高率
放電の繰返し試験を実施したときの充電終期における電
池内圧力の変化を示したものである。第２図の結果から
、この様な充放電の条件では、■の電池の充電終期にお
ける電池内圧力はほとんど変化しないが、■、■および
■、■の電池では、サイクル数とともに上昇し、とくに
■、■の電池の圧力上昇が大きいことがわかる。Compared to ■, which is a rapidly unformed battery in which these batteries are charged at 5CmA for 15 minutes, ■~■, ■, and ■ all have a smaller increase in internal pressure, and the effect is greatest in ■, followed by ■, ■. , ■, ■. on the other hand,
Figure 2 shows the internal pressure of the battery at the end of charging when the batteries ■～■, ■, and ■ were repeatedly charged at 50 mA for 15 minutes and completely discharged at 3 CmA. It shows the change. From the results shown in Figure 2, under these charging and discharging conditions, the internal pressure of the battery (■) at the end of charging hardly changes, but for the batteries (■, ■, and ■, ■), it increases with the number of cycles, especially It can be seen that the pressure increase in the batteries ① and ② is large.
つぎに、第３図は、■〜■の電池の、初期における１ｃ
ｍＡ電流による放電曲線を示したものである。第３図の
結果から、放電開始直後の電圧低下および放電容量にお
いて比較すると、いかなる撥水処理も施していない従来
形の電池である■にくらべ、■および■はほとんど差が
なく、■は第二の水素吸蔵合金が少ない分、容量が小さ
い。これに対し、■は放電開始直後の電圧低下がやや大
きく、■は放電開始直後の電圧低下および放電容量の両
方において特性が劣ることがわかった。Next, Figure 3 shows the initial 1c
It shows a discharge curve according to mA current. From the results in Figure 3, when comparing the voltage drop and discharge capacity immediately after the start of discharge, there is almost no difference between ■ and ■ compared to ■, which is a conventional battery without any water repellent treatment, and ■ Since there is less hydrogen storage alloy in the second example, the capacity is smaller. On the other hand, it was found that the voltage drop immediately after the start of discharge was slightly large in the case ①, and the characteristics of the case ① were inferior in both the voltage drop immediately after the start of discharge and the discharge capacity.
発明の効果
以上述べてきたように、本発明においては、水素吸蔵合
金を負極にもちいた密閉形アルカリ二次電池において、
電池特性、特に放電特性を損なうことなく、急速充電時
の電池内圧力の上昇を防止することができる点、工業的
価値甚大である。Effects of the Invention As described above, in the present invention, in a sealed alkaline secondary battery using a hydrogen storage alloy for the negative electrode,
The present invention has great industrial value in that it is possible to prevent the internal pressure of the battery from increasing during rapid charging without impairing the battery characteristics, especially the discharge characteristics.
第１図は急速充電中の電池内圧力の変化の図、第２図は
急速充電−高率放電サイクル宙の電池内圧力の変化の図
、第３図は１ｃｍＡ放電特性を示した図、第４図は、実
施例に示した合金［Ａ）、（Ｂ）のＰＣＴ線図である。Figure 1 is a diagram of changes in battery internal pressure during rapid charging, Figure 2 is a diagram of changes in battery internal pressure during a rapid charge-high rate discharge cycle, Figure 3 is a diagram showing 1 cmA discharge characteristics, FIG. 4 is a PCT diagram of alloys [A] and (B) shown in Examples.
Claims (1)
リ二次電池であって、表面が撥水処理された第一の水素
吸蔵合金と第二の水素吸蔵合金との二種類の水素吸蔵合
金からなる負極を有し、負極容量の上記第一の水素吸蔵
合金に起因する部分が、正極の容量に対する負極容量の
過剰分すなわちいわゆる充電リザーブ量を越えないこと
を特徴とする密閉形アルカリ二次電池。 ２）上記第一の水素吸蔵合金と第二の水素吸蔵合金の組
成が異なっており、上記第一の水素吸蔵合金の水素の吸
蔵・放出平衡圧力が、上記第二の水素吸蔵合金よりも大
きい請求項第１項に記載の密閉形アルカリ二次電池。 ３）上記第一の水素吸蔵合金の表面を撥水処理する方法
が、上記第一の水素吸蔵合金の粉末とフッ素樹脂とを混
合して焼成することである請求項第１項または第２項に
記載の密 閉形アルカリ二次電池。 ４）上記フッ素樹脂が、フッ素樹脂の微粉末を溶媒中に
分散・懸濁させたフッ素樹脂ディスパージョンであり、
上記混合の方法が、上記第一の水素吸蔵合金の粉末に上
記フッ素樹脂ディスパージョンを添加して混練すること
である請求項第４項に記載の密閉形アルカリ二次電池。[Scope of Claims] 1) A sealed alkaline secondary battery in which the capacity of the negative electrode is larger than that of the positive electrode, comprising a first hydrogen storage alloy and a second hydrogen storage alloy whose surfaces are treated to be water repellent. It has a negative electrode made of two types of hydrogen storage alloys, and is characterized in that the portion of the negative electrode capacity attributable to the first hydrogen storage alloy does not exceed the excess of the negative electrode capacity relative to the positive electrode capacity, that is, the so-called charge reserve amount. Sealed alkaline secondary battery. 2) The compositions of the first hydrogen storage alloy and the second hydrogen storage alloy are different, and the hydrogen storage/release equilibrium pressure of the first hydrogen storage alloy is higher than that of the second hydrogen storage alloy. The sealed alkaline secondary battery according to claim 1. 3) Claim 1 or 2, wherein the method for water-repelling the surface of the first hydrogen-absorbing alloy is to mix the powder of the first hydrogen-absorbing alloy and a fluororesin and then sintering the mixture. The sealed alkaline secondary battery described in . 4) The fluororesin is a fluororesin dispersion in which fine powder of fluororesin is dispersed and suspended in a solvent,
5. The sealed alkaline secondary battery according to claim 4, wherein the mixing method is to add the fluororesin dispersion to the powder of the first hydrogen storage alloy and knead it.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2286221A JP2979624B2 (en) | 1990-10-24 | 1990-10-24 | Sealed alkaline secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2286221A JP2979624B2 (en) | 1990-10-24 | 1990-10-24 | Sealed alkaline secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04162353A true JPH04162353A (en) | 1992-06-05 |
| JP2979624B2 JP2979624B2 (en) | 1999-11-15 |
Family
ID=17701539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2286221A Expired - Fee Related JP2979624B2 (en) | 1990-10-24 | 1990-10-24 | Sealed alkaline secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2979624B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6329100B1 (en) | 1998-12-22 | 2001-12-11 | Sanyo Electric Co., Ltd. | Hydrogen absorbing alloy electrode and process for producing same |
| JP2004281195A (en) * | 2003-03-14 | 2004-10-07 | Yuasa Corp | Hydrogen storage alloy electrode and nickel-hydrogen storage battery using this |
| JP2018056113A (en) * | 2016-09-26 | 2018-04-05 | プライムアースＥｖエナジー株式会社 | Nickel hydrogen storage battery |
-
1990
- 1990-10-24 JP JP2286221A patent/JP2979624B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6329100B1 (en) | 1998-12-22 | 2001-12-11 | Sanyo Electric Co., Ltd. | Hydrogen absorbing alloy electrode and process for producing same |
| JP2004281195A (en) * | 2003-03-14 | 2004-10-07 | Yuasa Corp | Hydrogen storage alloy electrode and nickel-hydrogen storage battery using this |
| JP2018056113A (en) * | 2016-09-26 | 2018-04-05 | プライムアースＥｖエナジー株式会社 | Nickel hydrogen storage battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2979624B2 (en) | 1999-11-15 |
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