JPH09306537A - Alkaline storage battery and manufacture thereof - Google Patents
Alkaline storage battery and manufacture thereofInfo
- Publication number
- JPH09306537A JPH09306537A JP8120022A JP12002296A JPH09306537A JP H09306537 A JPH09306537 A JP H09306537A JP 8120022 A JP8120022 A JP 8120022A JP 12002296 A JP12002296 A JP 12002296A JP H09306537 A JPH09306537 A JP H09306537A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- active material
- electrode active
- material layer
- 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.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 238000003860 storage Methods 0.000 title claims description 16
- 239000007773 negative electrode material Substances 0.000 claims abstract description 47
- 238000004804 winding Methods 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims description 17
- 238000010248 power generation Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 11
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 18
- 239000002002 slurry Substances 0.000 description 8
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000003466 welding Methods 0.000 description 7
- 229910052793 cadmium Inorganic materials 0.000 description 6
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000005871 repellent Substances 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 239000011149 active material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229920001477 hydrophilic polymer Polymers 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- CXKCTMHTOKXKQT-UHFFFAOYSA-N cadmium oxide Inorganic materials [Cd]=O CXKCTMHTOKXKQT-UHFFFAOYSA-N 0.000 description 1
- CFEAAQFZALKQPA-UHFFFAOYSA-N cadmium(2+);oxygen(2-) Chemical compound [O-2].[Cd+2] CFEAAQFZALKQPA-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910000652 nickel hydride Inorganic materials 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 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
-
- 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
Landscapes
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、導電芯体の両面に
負極活物質層が形成されると共にこれら両負極活物質層
の表面には導電層が形成された負極と、正極とが、セパ
レータを介して渦巻き状に巻回される構造の発電要素を
有するアルカリ蓄電池及びその製造方法に関する。TECHNICAL FIELD The present invention relates to a separator in which a negative electrode having positive electrode active material layers formed on both surfaces of a conductive core and a conductive layer formed on the surfaces of both negative electrode active material layers and a positive electrode. The present invention relates to an alkaline storage battery having a power generation element having a structure in which it is wound in a spiral shape through a battery and a manufacturing method thereof.
【０００２】[0002]
【従来の技術】ニッケル−カドミウム蓄電池やニッケル
−水素化物蓄電池に代表されるアルカリ蓄電池の負極板
は、種々の性能向上を目的として極板表面に導電層が形
成されている。上記導電層の具体的な製造方法として
は、導電性を有する粉末（例えば、炭素粉末）や、撥水
性を有する粉末（例えば、フッ素樹脂粉末）を、親水性
高分子から成る糊料〔例えば、ポリビニルアルコール
（ＰＶＡ）、ポリビニルピロリドン（ＰＶＰ）〕と混練
したものを負極活物質層の表面に塗着し、乾燥させるこ
とにより形成する。2. Description of the Related Art In a negative electrode plate of an alkaline storage battery represented by a nickel-cadmium storage battery or a nickel-hydride storage battery, a conductive layer is formed on the surface of the electrode plate in order to improve various performances. As a specific method for producing the conductive layer, a conductive powder (for example, carbon powder) or a water-repellent powder (for example, fluororesin powder) is used as a paste consisting of a hydrophilic polymer [for example, Polyvinyl alcohol (PVA), polyvinylpyrrolidone (PVP)] is kneaded, and the mixture is applied to the surface of the negative electrode active material layer and dried.
【０００３】このようにして導電層が形成されたカドミ
ウム負極板を用いて作製されたニッケル−カドミウム蓄
電池では、導電性を有する粉末により負極表面の導電性
が向上し、撥水性を有する粉末により負極表面の撥水性
が向上するため、過充電時に正極から発生する酸素ガス
の吸収能力が向上する。加えて、親水性高分子から成る
糊料により、電極表面に強固な皮膜が形成されるため
に、充放電時に電解液に溶解したカドミウム中間体がセ
パレータに移動し、やがては内部ショートに至らしめる
という、カドミウム電極に特有の現象であるマイグレー
ションを防ぎ、電池の寿命を向上させるといった効果が
ある。In the nickel-cadmium storage battery prepared by using the cadmium negative electrode plate having the conductive layer thus formed, the conductive powder improves the conductivity of the negative electrode surface, and the water-repellent powder improves the negative electrode. Since the water repellency of the surface is improved, the ability to absorb oxygen gas generated from the positive electrode during overcharge is improved. In addition, since a strong coating is formed on the surface of the electrode due to the hydrophilic polymer paste, the cadmium intermediate dissolved in the electrolyte moves to the separator during charging and discharging, eventually leading to an internal short circuit. That is, it has an effect of preventing migration, which is a phenomenon peculiar to the cadmium electrode, and improving the life of the battery.
【０００４】一方、電池の組み立て方法としては、以下
に示す方法が提案されている。先ず、正極と負極とをセ
パレータを介して巻回して発電要素を作製する（この
際、発電要素の最外周は負極であっても、この負極がセ
パレータで覆われている構造であっても良い）。次に、
上記発電要素の端部をテープ止めか熱溶着により仮止め
する。次いで、上記正負極に集電用の集電板を各々溶接
した後、発電要素を外装缶に挿入し、更に外装缶の底に
て上記集電体を溶接するという方法。しかしながら、上
記の方法では、発電要素を作製した後に集電板の溶接工
程および缶底の溶接工程が必要となるため、生産性が低
下する。On the other hand, the following method has been proposed as a method for assembling a battery. First, a positive electrode and a negative electrode are wound around a separator to produce a power generating element (in this case, the outermost periphery of the power generating element may be the negative electrode or the negative electrode may be covered with the separator. ). next,
The end of the power generating element is temporarily fixed by tape or heat welding. Next, a method of welding a current collector plate for collecting current to each of the positive and negative electrodes, inserting a power generation element into an outer can, and further welding the current collector at the bottom of the outer can. However, in the above method, since the step of welding the current collector plate and the step of welding the can bottom are required after producing the power generation element, the productivity is reduced.
【０００５】そこで、電極の組立工程を簡略化して生産
性を向上させるために、以下に示す方法が提案されてい
る。先ず、予め集電タブのついた正極と負極とをセパレ
ータを介して巻回して発電要素を作製する（この際、発
電要素の最外周は負極で覆われる構造である）。次に、
上記発電要素をそのままの状態（即ち、仮止めを施さな
い状態）で、外装缶に挿入する方法である。この方法で
は、負極の給電及び集電は、発電要素の最外周に位置す
る負極と外装缶の内側面とが接触することにより行われ
る（以後、この方法を”最外周接触方式”と称する）。Therefore, in order to simplify the electrode assembly process and improve the productivity, the following method has been proposed. First, a positive electrode and a negative electrode having a current collecting tab in advance are wound around a separator to produce a power generation element (in this case, the outermost periphery of the power generation element is covered with the negative electrode). next,
In this method, the power generating element is inserted into the outer can as it is (that is, in a state where temporary fixing is not performed). In this method, power supply and current collection of the negative electrode are performed by contacting the negative electrode located at the outermost periphery of the power generation element with the inner side surface of the outer can (hereinafter, this method is referred to as "outermost contact method"). .
【０００６】この方法を用いれば、集電板の溶接工程お
よび缶底の溶接工程を省くことができるので、生産性の
向上を図ることができる。加えて、最外周のセパレータ
と負極の集電板とが不要となって、電池の径方向及び高
さ方向における極板の占有体積が増加するので、電池の
高容量化を達成することもできる。したがって、前述の
表面に導電層が形成された負極を用いて、最外周接触方
式の巻き取り方法を採用すれば、製造工程が簡略化さ
れ、高容量かつ高性能のアルカリ蓄電池を得ることがで
きる。特に、負極がカドミウム電極の場合には、導電層
によってマイグレーションの進行を抑えることができる
ため、内部ショートによる電池の容量劣化を改善でき
る。By using this method, it is possible to omit the welding process of the current collector plate and the welding process of the can bottom, so that the productivity can be improved. In addition, the outermost peripheral separator and the negative electrode current collector plate are not required, and the volume occupied by the electrode plate in the radial direction and the height direction of the battery is increased, so that the battery capacity can be increased. . Therefore, if the outermost peripheral contact type winding method is used by using the negative electrode having the conductive layer formed on the above-mentioned surface, the manufacturing process is simplified, and a high-capacity and high-performance alkaline storage battery can be obtained. . In particular, when the negative electrode is a cadmium electrode, the progress of migration can be suppressed by the conductive layer, so that the capacity deterioration of the battery due to an internal short circuit can be improved.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、前記負
極を用いた電池では、外装缶と接触する負極の最外周面
にも導電性が形成されており、この導電層に含まれる糊
料は電解液により膨潤する。このため、集電体を使用し
た従来の方法で製造された電池に比べると、内部抵抗が
高くなる。特に、充放電を繰り返すとこの現象はさらに
顕著になるため、負極と外装缶内側面との間の接触抵抗
が増して電池の内部抵抗が上昇し、その結果充放電性能
が低下するという課題が生じる。However, in the battery using the negative electrode, conductivity is also formed on the outermost peripheral surface of the negative electrode which is in contact with the outer can, and the paste contained in this conductive layer is the electrolyte solution. Swells due to. Therefore, the internal resistance is higher than that of the battery manufactured by the conventional method using the current collector. In particular, since this phenomenon becomes more remarkable when charging and discharging are repeated, there is a problem in that the contact resistance between the negative electrode and the inner surface of the outer can increases to increase the internal resistance of the battery, resulting in a decrease in charging and discharging performance. Occurs.
【０００８】本発明は、上記従来の課題を考慮してなさ
れたものであって、充放電の繰り返しによる内部抵抗の
上昇を抑えて、高容量かつ高性能で長寿命のアルカリ蓄
電池を提供することを目的とする。The present invention has been made in consideration of the above conventional problems, and provides an alkaline storage battery of high capacity, high performance and long life, which suppresses an increase in internal resistance due to repeated charging and discharging. With the goal.
【０００９】[0009]
【課題を解決するための手段】前述した目的を達成する
ために、本発明のうちで請求項１記載の発明は、導電芯
体の両面に負極活物質層が形成され、これら両負極活物
質層の表面に導電性粉末と親水性の糊料とが含有された
導電層が形成された負極と、正極とが、セパレータを介
して渦巻き状に巻回される構造の発電要素を有し、且
つ、この発電要素が有底筒状の外装缶内に収納されると
共に、上記外装缶の内側面と上記負極の最外周の外側面
とが接触して上記外装缶が負極端子を兼用する構造のア
ルカリ蓄電池において、前記外装缶の内側面と接触する
前記負極の最外周の外側面には、前記負極活物質層が露
出している部分が設けられることを特徴とする。In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is such that a negative electrode active material layer is formed on both surfaces of a conductive core, and both negative electrode active materials are formed. A negative electrode on which a conductive layer containing a conductive powder and a hydrophilic paste is formed on the surface of the layer, and the positive electrode has a power generation element having a structure that is spirally wound via a separator, In addition, the power generating element is housed in a bottomed cylindrical outer can, and the inner can of the outer can contacts the outermost outer surface of the negative electrode so that the outer can also serves as a negative electrode terminal. In the alkaline storage battery, the outermost outer surface of the negative electrode, which is in contact with the inner surface of the outer can, is provided with a portion where the negative electrode active material layer is exposed.
【００１０】上記構成であれば、表面に導電性粉末及び
親水性の糊料からなる導電層が、最外周負極の外側面を
除いて形成されている（つまり正極と対向している面に
は全て形成されている）ため、酸素ガス吸収性能の向上
を図ることができると共にカドミウム負極におけるマイ
グレーションの進行を抑制することが出来る。一方、渦
巻き状の発電要素の最外周負極の外側面を外装缶の内側
面に直接接触させる最外周接触方式を採用しているが、
外装缶の内側面と接触する負極表面には導電層が形成さ
れていない部分が存在する（即ち、負極活物質層が露出
している部分が存在する）ため、負極と外装缶との接触
抵抗が小さくなる。このため、充放電を繰り返しても電
池の内部抵抗の上昇が抑制され、安定した充放電特性を
保つことができる。With the above structure, a conductive layer composed of conductive powder and hydrophilic paste is formed on the surface except the outer surface of the outermost peripheral negative electrode (that is, the surface facing the positive electrode is Since they are all formed), the oxygen gas absorption performance can be improved and the migration of the cadmium negative electrode can be suppressed. On the other hand, the outermost peripheral contact method in which the outer surface of the outermost peripheral negative electrode of the spiral power generation element is directly contacted with the inner surface of the outer can is adopted.
Since there is a portion where the conductive layer is not formed on the negative electrode surface that contacts the inner surface of the outer can (that is, there is a portion where the negative electrode active material layer is exposed), the contact resistance between the negative electrode and the outer can. Becomes smaller. Therefore, even if charging and discharging are repeated, increase in internal resistance of the battery is suppressed, and stable charging and discharging characteristics can be maintained.
【００１１】また請求項２記載の発明は、請求項１記載
の発明の構成において、負極活物質層が露出している部
分の長さが、外装缶の内側面の周長さと略同等となるよ
う構成されていることを特徴とする。上記構成であれ
ば、外装缶の内側面と接触する負極表面には導電層が全
く存在しないので、負極と外装缶との接触抵抗がより小
さくなる。According to a second aspect of the invention, in the structure of the first aspect of the invention, the length of the exposed portion of the negative electrode active material layer is substantially equal to the circumferential length of the inner side surface of the outer can. It is characterized in that it is configured as follows. With the above structure, since the conductive layer does not exist on the surface of the negative electrode that contacts the inner surface of the outer can, the contact resistance between the negative electrode and the outer can becomes smaller.
【００１２】また請求項３記載の発明は、導電芯体の両
面に負極活物質層を形成した後、両負極活物質層のうち
一方の負極活物質層の表面全面に、導電性粉末と親水性
の糊料とが含有された導電層を形成すると共に、上記両
負極活物質層のうち他方の負極活物質層の表面の一部を
除いて上記と同様の組成を有する導電層を形成して、負
極活物質層が露出している部分が設けられた負極を作製
する第１ステップと、前記負極における負極活物質層が
露出している部分が最外周の外側に位置するように、負
極と、正極とを、セパレータを介して渦巻き状に巻回し
て発電要素を作製する第２ステップと、前記発電要素
を、負極端子を兼用する有底筒状の外装缶内に収納する
第３ステップとを有することを特徴とする。このような
方法により、請求項１記載のアルカリ蓄電池が作製され
る。According to the third aspect of the present invention, after the negative electrode active material layer is formed on both surfaces of the conductive core, the conductive powder and the hydrophilic powder are formed on the entire surface of one of the negative electrode active material layers. Forming a conductive layer containing a conductive paste, and forming a conductive layer having the same composition as the above except a part of the surface of the other negative electrode active material layer of the both negative electrode active material layers. The first step of producing a negative electrode provided with a portion where the negative electrode active material layer is exposed, and the negative electrode so that the portion of the negative electrode where the negative electrode active material layer is exposed is located outside the outermost periphery. A second step of spirally winding the positive electrode and the positive electrode through a separator to produce a power generating element, and a third step of housing the power generating element in a bottomed cylindrical outer can that also serves as a negative electrode terminal. And having. By such a method, the alkaline storage battery according to claim 1 is manufactured.
【００１３】また請求項４記載の発明は、請求項３記載
の発明の構成において、負極活物質層が露出している部
分の長さが、外装缶の内側面の周長さと略同等となるよ
う構成されていることを特徴とする。このような方法に
より、請求項２記載のアルカリ蓄電池が作製される。According to a fourth aspect of the invention, in the structure of the third aspect of the invention, the length of the exposed portion of the negative electrode active material layer is substantially equal to the circumferential length of the inner surface of the outer can. It is characterized in that it is configured as follows. By such a method, the alkaline storage battery according to claim 2 is manufactured.
【００１４】[0014]
【発明の実施の形態】本発明の実施の形態を、図１〜図
４に基づいて、以下に説明する。図１は渦巻き状に巻回
する前の負極における一方の面（巻回後は外側に位置す
る面）の正面図、図２は図１のＡ−Ａ線矢視断面図、図
３は渦巻き状に巻回する前の負極における他方の面（巻
回後は内側に位置する面）の正面図、図４は負極を正極
及びセパレータと共に渦巻き状に巻回した発電要素の斜
視図である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 is a front view of one surface (a surface located outside after winding) of the negative electrode before being spirally wound, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 4 is a front view of the other surface (the surface located inside after winding) of the negative electrode before being spirally wound, and FIG. 4 is a perspective view of the power generation element in which the negative electrode is spirally wound with the positive electrode and the separator.
【００１５】図２に示すように、負極１０は導電芯体１
を有しており、この導電芯体１の両面には負極活物質層
２ａ・２ｂが形成されている。これら負極活物質層２ａ
・２ｂのうち負極活物質層２ａの表面には、導電層３ａ
が形成されている。この導電層３ａは負極活物質層２ａ
の全面には形成されておらず、具体的には、図１に示す
ように、負極の巻取り開始端部４から長さｔ1 だけ形成
されている。これにより、図４に示すように、負極１０
を正極１１及びセパレータ１２と共に巻回して発電要素
１３を作製した場合に、負極１０の巻取り終端部近傍の
外側面１４は負極活物質層２ａが露出する一方、正極１
１と対向する部位には全て導電層３ａが設けられる構成
となっている。また、前記負極活物質層２ａ・２ｂのう
ち負極活物質層２ｂでは、図３に示すように、その全面
に導電層３ｂが形成されており、これにより、正極１１
と対向する部位には全て導電層３ｂが設けられる構成と
なる。As shown in FIG. 2, the negative electrode 10 is a conductive core body 1.
And the negative electrode active material layers 2a and 2b are formed on both surfaces of the conductive core 1. These negative electrode active material layers 2a
The conductive layer 3a is formed on the surface of the negative electrode active material layer 2a of 2b.
Are formed. The conductive layer 3a is the negative electrode active material layer 2a.
Is not formed on the entire surface of the negative electrode, and specifically, is formed by the length t 1 from the winding start end 4 of the negative electrode as shown in FIG. As a result, as shown in FIG.
When the power generation element 13 is manufactured by winding the positive electrode 11 and the separator 12 together with the positive electrode 11, the negative electrode active material layer 2a is exposed on the outer surface 14 of the negative electrode 10 in the vicinity of the winding end portion, while the positive electrode 1
The conductive layer 3a is provided in all of the portions facing 1 in FIG. In the negative electrode active material layer 2b of the negative electrode active material layers 2a and 2b, the conductive layer 3b is formed on the entire surface as shown in FIG.
The conductive layer 3b is provided in all of the portions facing.
【００１６】また、上記構造の発電要素１３は、負極端
子を兼用する有底筒状の外装缶（図示せず）内に収納さ
れており、この外装缶の開口部は開口蓋（図示せず）に
よって封口されている。The power generating element 13 having the above structure is housed in a bottomed cylindrical outer can (not shown) that also serves as a negative electrode terminal, and the opening of the outer can is an opening lid (not shown). ) Is sealed.
【００１７】上記構造の電池を、以下のようにして作製
した。先ず、負極活物質と、有機繊維、水和防止剤等を
含む糊料溶液とを混練して活物質ペーストを調製した
後、この活物質ペーストを導電芯体１の両面に塗着、乾
燥して、導電芯体の両面に負極活物質層２ａ・２ｂを形
成した。次いで、導電性粉末と、撥水性粉末と、親水性
糊料を含む水溶液とから成るスラリーを調製した後、こ
のスラリーを前記負極活物質層２ａ・２ｂの両面にコー
ティングした。この際、これら負極活物質層２ａ・２ｂ
のうち負極活物質層２ａの表面では、負極の巻取り開始
端部４から長さｔ1 だけスラリーをコーティングした。
一方、負極活物質層２ｂの表面では、全面にスラリーを
コーティングした。その後、上記スラリーを乾燥させる
ことにより、負極１０を作製した。A battery having the above structure was manufactured as follows. First, a negative electrode active material and a paste solution containing an organic fiber, a hydration inhibitor and the like are kneaded to prepare an active material paste, and the active material paste is applied to both surfaces of the conductive core 1 and dried. Then, the negative electrode active material layers 2a and 2b were formed on both surfaces of the conductive core. Then, after preparing a slurry comprising a conductive powder, a water-repellent powder, and an aqueous solution containing a hydrophilic paste, both surfaces of the negative electrode active material layers 2a and 2b were coated with this slurry. At this time, these negative electrode active material layers 2a and 2b
Of the above, the surface of the negative electrode active material layer 2a was coated with the slurry for a length t 1 from the winding start end 4 of the negative electrode.
On the other hand, the entire surface of the negative electrode active material layer 2b was coated with the slurry. Then, the negative electrode 10 was produced by drying the said slurry.
【００１８】しかる後、負極活物質層２ａが露出してい
る部位が最外周の外側面となるように、上記負極１０と
公知のニッケル正極１１とをセパレータ１２を介して巻
回して発電要素１３を作製した後、この発電要素１３を
外装缶に挿入した。その後、外装缶内に電解液を注入し
た後、外装缶の開口部を封口蓋により封口して電池を作
製した。尚、上記実施の形態では、スラリー調製時に撥
水性粉末を含ましているが、これを添加しなくても本発
明の効果を得ることはできる。Thereafter, the negative electrode 10 and a known nickel positive electrode 11 are wound around a separator 12 so that the exposed portion of the negative electrode active material layer 2a becomes the outermost peripheral surface, and the power generating element 13 is wound. After producing, the power generating element 13 was inserted into an outer can. After that, after injecting the electrolytic solution into the outer can, the opening of the outer can was sealed with a sealing lid to manufacture a battery. In the above embodiment, the water-repellent powder is included in the slurry preparation, but the effects of the present invention can be obtained without adding the water-repellent powder.
【００１９】[0019]
【実施例】本発明の一実施例を、図５に基づいて、以下
に説明する。 （実施例）実施例に示す電池の構造は、上記実施の形態
に示す構造と同一であり、また製造方法の具体例は、以
下の通りである。前記活物質ペーストは、酸化カドミウ
ム及び金属カドミウムから成る負極活物質と、有機繊
維、水和防止剤等を含む糊料溶液とを混練することによ
り作製した。EXAMPLE An example of the present invention will be described below with reference to FIG. (Example) The structure of the battery shown in the example is the same as the structure shown in the above embodiment, and the specific example of the manufacturing method is as follows. The active material paste was prepared by kneading a negative electrode active material composed of cadmium oxide and metallic cadmium, and a paste solution containing organic fibers, a hydration inhibitor and the like.
【００２０】また、前記スラリーは、導電性粉末として
の炭素粉末１０重量部と、親水性糊料としてのポリビニ
ルピロリドン１０重量部と、撥水性粉末としてのテフロ
ンディスパージョン３０−Ｊ（三井デュポンフロロケミ
カル（株）製）を１０重量％の割合で含む水溶液１００
重量部とから構成されている。The above-mentioned slurry contains 10 parts by weight of carbon powder as a conductive powder, 10 parts by weight of polyvinylpyrrolidone as a hydrophilic paste, and Teflon Dispersion 30-J (Mitsui DuPont Fluorochemicals) as a water repellent powder. 100% aqueous solution containing 10% by weight
It is composed of parts by weight.
【００２１】更に、負極の巻取り開始端部４から長さｔ
1 は１０５ｍｍとし、負極の全長ｔ 2 は１４０ｍｍとし
た。また、ニッケル正極の全長は１０５ｍｍとした。
尚、本実施例の電池の容量は、公称容量１４００ｍＡｈ
である。このようにして作製した電池を、以下本発明電
池Ａと称する。Further, the length t from the winding start end 4 of the negative electrode is
1Is 105 mm, and the total length t of the negative electrode is TwoIs 140 mm
Was. The total length of the nickel positive electrode was 105 mm.
The capacity of the battery of this example is 1400 mAh nominal capacity.
It is. The battery thus produced is hereinafter referred to as the battery of the present invention.
It is called pond A.
【００２２】〔比較例〕前記スラリーを両負極活物質層
の全面にコーティングして、両負極活物質層の全面が完
全に導電層で覆われるようにする他は、上記実施例と同
様にして電池を作製した。このようにして作製した電池
を、以下比較電池Ｘと称する。[Comparative Example] The same procedure as in the above Example except that the entire surface of both negative electrode active material layers was coated with the slurry so that the entire surfaces of both negative electrode active material layers were completely covered with the conductive layers. A battery was made. The battery fabricated in this manner is hereinafter referred to as Comparative Battery X.
【００２３】〔実験〕本発明電池Ａと比較電池Ｘとにつ
いて、充放電サイクルを繰り返した時の電池容量と内部
抵抗との推移を調べたので、それらの結果を各々図５及
び表１に示す。尚、充放電サイクルの条件は、１Ｃの電
流で満充電状態となるまで充電した後、１時間休止し、
１Ｃの電流で放電終止電圧１．０Ｖまで放電し、さらに
１時間休止するというサイクルを繰り返すという条件で
ある。[Experiment] With respect to the battery A of the present invention and the comparative battery X, transitions of the battery capacity and the internal resistance when the charging / discharging cycle was repeated were examined. The results are shown in FIG. 5 and Table 1, respectively. . The condition of the charge / discharge cycle is to charge the battery with a current of 1C until the battery is fully charged, and then pause for 1 hour.
The condition is that the cycle of discharging at a discharge end voltage of 1.0 V with a current of 1 C and then resting for 1 hour is repeated.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１及び図５から明らかなように、最外周
の外側面にも導電層が形成された比較電池Ｘでは、充放
電サイクルを繰り返すにしたがって内部抵抗が徐々に上
昇する。このため、４００サイクル経過後以降に電池容
量が急激に低下し、電池の長寿命化が図れない。一方、
最外周の外側面に導電層を形成していない本発明電池Ａ
では、充放電サイクルを繰り返しても内部抵抗の上昇が
緩やかである。したがって、電池容量が急激に低下せ
ず、その結果、比較電池Ｘより電池寿命が長くなる。As is clear from Table 1 and FIG. 5, in the comparative battery X having the conductive layer formed on the outermost surface of the outermost periphery, the internal resistance gradually increases as the charging / discharging cycle is repeated. Therefore, the battery capacity is drastically reduced after the elapse of 400 cycles, and the life of the battery cannot be extended. on the other hand,
Battery A of the present invention in which a conductive layer is not formed on the outer surface of the outermost periphery.
Then, even if the charge / discharge cycle is repeated, the increase in the internal resistance is gentle. Therefore, the battery capacity does not drop sharply, and as a result, the battery life becomes longer than that of the comparative battery X.
【００２６】[0026]
【発明の効果】以上説明したように本発明によれば、外
装缶の内側面と接触する負極表面には導電層が形成され
ていない部分が存在するため、負極と外装缶との接触抵
抗が小さくなる。したがって、充放電を繰り返しても電
池の内部抵抗の上昇が抑えられ、電池寿命が長くなると
いった優れた効果を奏する。As described above, according to the present invention, since there is a portion where the conductive layer is not formed on the surface of the negative electrode that contacts the inner surface of the outer can, the contact resistance between the negative electrode and the outer can is increased. Get smaller. Therefore, even if charging and discharging are repeated, an increase in the internal resistance of the battery is suppressed, and the excellent effect of extending the battery life is achieved.
【図１】渦巻き状に巻回する前の負極における一方の面
（巻回後は外側に位置する面）の正面図である。FIG. 1 is a front view of one surface (a surface located outside after winding) of a negative electrode before being spirally wound.
【図２】図１のＡ−Ａ線矢視断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】渦巻き状に巻回する前の負極における他方の面
（巻回後は内側に位置する面）の正面図である。FIG. 3 is a front view of the other surface (the surface located inside after the winding) of the negative electrode before the spiral winding.
【図４】負極と正極とをセパレータを介して渦巻き状に
巻回することにより作製した発電要素の斜視図である。FIG. 4 is a perspective view of a power generation element produced by spirally winding a negative electrode and a positive electrode via a separator.
【図５】本発明電池Ａと比較電池Ｘとにおけるサイクル
特性を示すグラフである。FIG. 5 is a graph showing cycle characteristics of the present battery A and the comparative battery X.
２ａ：負極活物質層 ２ｂ：負極活物質層 ３ａ：導電層 ３ｂ：導電層 １０：負極 １１：正極 １２：セパレータ １３：発電要素 １４：外側面 2a: Negative electrode active material layer 2b: Negative electrode active material layer 3a: Conductive layer 3b: Conductive layer 10: Negative electrode 11: Positive electrode 12: Separator 13: Power generation element 14: Outside surface
Claims (4)
れ、これら両負極活物質層の表面に導電性粉末と親水性
の糊料とが含有された導電層が形成された負極と、正極
とが、セパレータを介して渦巻き状に巻回される構造の
発電要素を有し、且つ、この発電要素が有底筒状の外装
缶内に収納されると共に、上記外装缶の内側面と上記負
極の最外周の外側面とが接触して上記外装缶が負極端子
を兼用する構造のアルカリ蓄電池において、 前記外装缶の内側面と接触する前記負極の最外周の外側
面には、前記負極活物質層が露出している部分が設けら
れることを特徴とするアルカリ蓄電池。1. A negative electrode in which a negative electrode active material layer is formed on both surfaces of a conductive core, and a conductive layer containing conductive powder and a hydrophilic paste is formed on the surfaces of both negative electrode active material layers. , The positive electrode has a power generation element having a structure in which it is spirally wound via a separator, and the power generation element is housed in a cylindrical outer can with a bottom, and the inner surface of the outer can. In an alkaline storage battery having a structure in which the outermost outer surface of the negative electrode is in contact with the outer can and also serves as a negative electrode terminal, the outermost outer surface of the negative electrode in contact with the inner surface of the outer can is, An alkaline storage battery, wherein a portion where the negative electrode active material layer is exposed is provided.
長さが、前記外装缶の内側面の周長さと略同等となるよ
う構成されていることを特徴とする請求項１記載のアル
カリ蓄電池。2. The length of the exposed portion of the negative electrode active material layer is configured to be substantially equal to the circumferential length of the inner side surface of the outer can. Alkaline storage battery.
た後、両負極活物質層のうち一方の負極活物質層の表面
全面に、導電性粉末と親水性の糊料とが含有された導電
層を形成すると共に、上記両負極活物質層のうち他方の
負極活物質層の表面の一部を除いて上記と同様の組成を
有する導電層を形成して、負極活物質層が露出している
部分が設けられた負極を作製する第１ステップと、 前記負極における負極活物質層が露出している部分が最
外周の外側に位置するように、負極と、正極とを、セパ
レータを介して渦巻き状に巻回して発電要素を作製する
第２ステップと、 前記発電要素を、負極端子を兼用する有底筒状の外装缶
内に収納する第３ステップと、 を有することを特徴とするアルカリ蓄電池の製造方法。3. A conductive powder and a hydrophilic paste are contained on the entire surface of one of the negative electrode active material layers after forming the negative electrode active material layers on both surfaces of the conductive core. And a conductive layer having the same composition as the above except a part of the surface of the other negative electrode active material layer of the both negative electrode active material layers is formed. A first step of producing a negative electrode provided with an exposed portion, a negative electrode and a positive electrode, a separator, so that the exposed portion of the negative electrode active material layer in the negative electrode is located outside the outermost periphery. And a third step of manufacturing the power generation element by spirally winding the power generation element in a bottomed cylindrical outer can that also serves as a negative electrode terminal. And a method of manufacturing an alkaline storage battery.
長さが、前記外装缶の内側面の周長さと略同等となるよ
う構成されていることを特徴とする請求項３記載のアル
カリ蓄電池の製造方法。4. The length of the exposed portion of the negative electrode active material layer is configured to be substantially equal to the circumferential length of the inner surface of the outer can. Manufacturing method of alkaline storage battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8120022A JPH09306537A (en) | 1996-05-15 | 1996-05-15 | Alkaline storage battery and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8120022A JPH09306537A (en) | 1996-05-15 | 1996-05-15 | Alkaline storage battery and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09306537A true JPH09306537A (en) | 1997-11-28 |
Family
ID=14775980
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8120022A Pending JPH09306537A (en) | 1996-05-15 | 1996-05-15 | Alkaline storage battery and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09306537A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115832449A (en) * | 2023-02-10 | 2023-03-21 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
-
1996
- 1996-05-15 JP JP8120022A patent/JPH09306537A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115832449A (en) * | 2023-02-10 | 2023-03-21 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
| WO2024164769A1 (en) * | 2023-02-10 | 2024-08-15 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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