JPH0877987A - Alkaline battery - Google Patents
Alkaline batteryInfo
- Publication number
- JPH0877987A JPH0877987A JP20968194A JP20968194A JPH0877987A JP H0877987 A JPH0877987 A JP H0877987A JP 20968194 A JP20968194 A JP 20968194A JP 20968194 A JP20968194 A JP 20968194A JP H0877987 A JPH0877987 A JP H0877987A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- positive electrode
- battery
- zinc negative
- electrode mixture
- 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
Classifications
-
- Y02E60/12—
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Primary Cells (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明はアルカリ電池の正極合剤
に関し、詳しくはゲル状亜鉛負極活物質と一定の形に成
形された正極合剤をセパレータによって分離する構造を
有するアルカリ電池において、製造過程および電池使用
途中に負極活物質がセパレータによって構成された陰極
室から正極合剤側への溢れなどが生じた場合に、両活物
質の直接および集電体を通じての電気的接触を防止する
ことによって放電性能の低下を防ぐものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive electrode mixture for an alkaline battery, and more particularly to an alkaline battery having a structure in which a gel-like zinc negative electrode active material and a positive electrode mixture molded in a certain shape are separated by a separator When the negative electrode active material overflows from the negative electrode chamber composed of the separator to the positive electrode mixture side during the process or during use of the battery, it is necessary to prevent electrical contact between both active materials, both directly and through the current collector. This prevents the deterioration of discharge performance.
【0002】[0002]
【従来の技術】一般的に電池の構成は正極、負極両活物
質を電気絶縁性のセパレータによって分離した構造にな
っている。アルカリ電池においては電池外周部に配置さ
れた筒状の正極合剤内部にカップ状にセパレータを設置
し、その内部にゲル状亜鉛負極を充填しガスケットで上
面を閉じた構造が一般的であるが、この両活物質の分離
が不十分であれば正負両活物質が接触し、内部ショート
を発生し電池が発熱したり、異常時には高濃度のアルカ
リ性電解液が漏液し、人体や使用機器に損傷を与える虞
があった。2. Description of the Related Art Generally, a battery has a structure in which both positive and negative electrode active materials are separated by an electrically insulating separator. In an alkaline battery, a structure in which a separator is installed in a cup shape inside a cylindrical positive electrode mixture arranged on the outer periphery of the battery, a gel zinc negative electrode is filled in the inside, and the upper surface is closed with a gasket is generally used. If the separation of the two active materials is insufficient, the positive and negative active materials will come into contact with each other, causing an internal short circuit and causing the battery to heat up. There was a risk of damage.
【0003】その対策として、カップ状セパレータの上
部から正極合剤側へゲル状亜鉛負極が溢れないように負
極を充填した後にカップ状セパレータの上部を閉じるな
どの方法が考案された。また、カップ状セパレータの上
面を閉じているガスケットにスカート部を設けゲル状亜
鉛負極の溢れなどを防止している。As a countermeasure against this, a method has been devised in which the upper portion of the cup-shaped separator is closed after filling the negative electrode so that the gel zinc negative electrode does not overflow from the upper portion of the cup-shaped separator to the positive electrode mixture side. Further, a skirt portion is provided on the gasket that closes the upper surface of the cup-shaped separator to prevent the gel-like zinc negative electrode from overflowing.
【0004】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ような従来のカップ状セパレータの上端部を閉じたりガ
スケットにスカート状の部分を設けた場合であっても強
い衝撃が加えられたり、電池温度上昇によるゲル状亜鉛
負極の膨脹などによって使用中に放電性能の低下を来す
ことがある。また、これらの方法は単純な溢れなどを防
止するものであり、異常な溢れなどが生じた際には正負
両活物質の接触を防ぐ有効な手段とはならない。従っ
て、従来の方法では構造的に正負両活物質を完全に分離
することは困難であり、電池の取扱いが適切でない場
合、電池性能を大きく損なう危険性がある。However, even when the upper end of the conventional cup-shaped separator is closed or the gasket is provided with a skirt-shaped portion as described above, a strong impact is applied or the battery temperature rises. The swelling of the gelled zinc negative electrode may cause deterioration in discharge performance during use. In addition, these methods prevent simple overflow and the like, and are not effective means for preventing contact between the positive and negative active materials when abnormal overflow occurs. Therefore, it is structurally difficult to completely separate the positive and negative active materials by the conventional method, and there is a risk that the battery performance will be significantly impaired if the battery is not properly handled.
【0005】アルカリ電池においてゲル状亜鉛負極の溢
れなどによって電池性能低下などが生じる原因は正負両
活物質が接触することにより、外部回路に電流が取り出
せなくなることによるものである。これを防ぐために
は、ゲル状亜鉛負極と正極合剤を構造的に完全に分離す
ることが望ましい。一般的にこのような活物質の接触は
電池に衝撃や温度が加えられゲル状亜鉛負極がカップ状
のセパレータから溢れ、正極合剤上に落下することによ
って生ずるものが大部分であることから、この正極合剤
の開放部分である正極合剤表面層を電気絶縁物で物理的
に遮断することによってこの問題は回避することが出来
る。しかしながら、この電気絶縁物質は電池の構造上セ
パレータと金属ケースのわずかな空間に設置する必要が
あり、セパレータ材や樹脂板などの使用では量産が困難
であった。In alkaline batteries, the cause of deterioration of battery performance due to overflow of gelled zinc negative electrode is that current cannot be taken out to an external circuit due to contact between both positive and negative active materials. In order to prevent this, it is desirable that the gelled zinc negative electrode and the positive electrode mixture are structurally completely separated. Generally, such contact of the active material is caused by the impact or temperature being applied to the battery, the gelled zinc negative electrode overflows from the cup-shaped separator, and is mostly caused by dropping on the positive electrode mixture, This problem can be avoided by physically blocking the positive electrode mixture surface layer, which is the open portion of the positive electrode mixture, with an electrical insulator. However, due to the structure of the battery, this electrically insulating material needs to be installed in a small space between the separator and the metal case, and mass production has been difficult when using a separator material or a resin plate.
【0006】本発明は上記従来の問題を解決するもの
で、アルカリ電池の取扱いや環境が不適切であったり、
電池使用中にゲル状亜鉛負極が正極合剤側に溢れても正
負両活物質が接触することを防ぎ、電池性能の低下を防
止することを目的とする。The present invention solves the above-mentioned problems of the prior art, and the handling and environment of the alkaline battery are inappropriate,
It is an object of the present invention to prevent contact between positive and negative active materials even when the gelled zinc negative electrode overflows to the positive electrode mixture side during use of the battery, thereby preventing deterioration of battery performance.
【0007】[0007]
【課題を解決するための手段】そこで、本発明では前記
絶縁物に液状シール剤を用いることで、量産性を損なわ
ず正極合剤の開放部を物理的に被覆することによって上
記問題の解決を図るものである。封口部に塗布するシー
ル剤は一般的にアルカリ電池において金属ケースと封口
ガスケット間のシール材として金属ケースに塗布される
ものであり、これを金属ケースの本来のシール剤を塗布
する部分から正極合剤の開放部まで塗布することは電池
構造的に比較的容易に可能である。Therefore, in the present invention, by using a liquid sealant as the insulator, the above problem is solved by physically covering the open portion of the positive electrode mixture without impairing mass productivity. It is intended. The sealant applied to the sealing part is generally applied to the metal case as a sealing material between the metal case and the sealing gasket in the alkaline battery, and this is applied from the portion of the metal case where the original sealant is applied to the positive electrode mixture. It is relatively easy to apply the agent to the open portion because of the structure of the battery.
【0008】これらの知見から、電気絶縁物に液状シー
ル剤を用い、少くとも封口部から正極合剤開放部まで液
状シール剤を塗布することで、性能低下の要因となる正
負両極活物質の接触を物理的に防止することができるこ
とから本発明に到達した。From these findings, by using a liquid sealant as an electric insulator and applying the liquid sealant at least from the sealing part to the positive electrode mixture open part, contact between the positive and negative active materials which becomes a factor of performance deterioration. The present invention was arrived at because it can be physically prevented.
【0009】[0009]
【作用】封口部に塗布するシール剤は通常、耐アルカリ
性で、塗布された表面から容易には離脱しないものが用
いられる。このシール剤は通常細いノズルで封口部のみ
に塗布されるが、ノズルを変更することで塗布範囲を容
易に変更することが可能である。また、封口部と正極合
剤の開放面は電池構造上近接しており、金属ケースの封
口部から正極合剤の開放面までシール剤を塗布すること
は他の絶縁物を設置するのに比較して容易である。そこ
で、前記シール剤を液状シール剤として金属ケースの封
口部から正極合剤の開放面まで塗布することで、アルカ
リ電池のゲル状亜鉛負極の充填が不適切で、電池製造過
程あるいは電池使用中にゲル状亜鉛負極が正極合剤側に
溢れた場合であっても液状シール剤が正極合剤表面を被
覆しているため、正負両活物質が接触せず、性能低下や
電池の発熱とそれに伴う漏液を防ぐことができる。The sealant applied to the sealing portion is usually alkali resistant and does not easily come off the coated surface. This sealing agent is usually applied to only the sealing portion with a thin nozzle, but the application range can be easily changed by changing the nozzle. In addition, the sealing part and the open surface of the positive electrode mixture are close to each other in terms of the battery structure, and applying the sealant from the sealing part of the metal case to the open surface of the positive electrode mixture is compared to installing other insulators. And easy. Therefore, by applying the sealing agent as a liquid sealing agent from the sealing portion of the metal case to the open surface of the positive electrode mixture, the gel-like zinc negative electrode of the alkaline battery is improperly filled, which may occur during the battery manufacturing process or during battery use Even if the gelled zinc negative electrode overflows to the positive electrode mixture side, the positive and negative active materials do not come into contact with each other because the liquid sealing agent covers the surface of the positive electrode mixture. Leakage can be prevented.
【0010】[0010]
【実施例】以下、実施例および比較例に基づいて本発明
を具体的に説明する。EXAMPLES The present invention will be specifically described below based on Examples and Comparative Examples.
【0011】実施例 図1に示すアルカリマンガン電池LR6を組立て本実施
例とした。図1において、1は二酸化マンガンに導電材
として黒鉛を添加し成形した正極合剤、2は水酸化カリ
ウムを溶解させたアルカリ電解液にゲル化剤と共に水銀
無添加の亜鉛合金粉末を分散させたゲル状亜鉛負極であ
る。3はセパレータ、4は負極集電体、5は正極端子キ
ャップ、6は金属ケース、7は電池のラベル外装、8は
封口ガスケット、9は負極端子をなす底板、10は絶縁
ワッシャーである。Example The alkaline manganese battery LR6 shown in FIG. 1 was assembled into this example. In FIG. 1, 1 is a positive electrode mixture formed by adding graphite as a conductive material to manganese dioxide, and 2 is a gelling agent and a zinc alloy powder containing no mercury added to an alkaline electrolyte in which potassium hydroxide is dissolved. It is a gelled zinc negative electrode. 3 is a separator, 4 is a negative electrode current collector, 5 is a positive electrode terminal cap, 6 is a metal case, 7 is a battery label exterior, 8 is a sealing gasket, 9 is a bottom plate which forms a negative electrode terminal, and 10 is an insulating washer.
【0012】図1の金属ケース封口部である金属ケース
内側面のガスケット当接部から開放部分である正極合剤
の表面層までを液状シール剤12を塗布し、ゲル状亜鉛
負極を充填、封口ガスケット8で封口して実施例とし
た。The liquid sealant 12 is applied from the gasket contacting portion on the inner surface of the metal case, which is the sealing portion of the metal case of FIG. 1, to the surface layer of the positive electrode mixture, which is the opening portion, and the gel zinc negative electrode is filled and sealed. A gasket 8 was used to seal the sample.
【0013】ここで液状シール剤としてはスルフォン化
ポリエチレンを使用した。 比較例 図1の金属ケース封口部のみにスルフォン化ポリエチレ
ンよるなるシール剤11を塗布し、ゲル状亜鉛負極を充
填、封口ガスケットで封口して比較例とした。Sulfonated polyethylene was used as the liquid sealing agent. Comparative Example A sealing agent 11 made of sulfonated polyethylene was applied only to the sealing portion of the metal case of FIG. 1, a gelled zinc negative electrode was filled, and a sealing gasket was used for sealing to make a comparative example.
【0014】このようにして、本実施例および比較例の
電池各1000個にゲル状亜鉛負極を充填し、電池に衝
撃を加えた時のゲル状亜鉛負極の溢れによる電圧の低下
を調査した結果を(表1)に示す。In this way, 1000 batteries each of the present example and the comparative example were filled with the gelled zinc negative electrode, and the voltage drop due to the overflow of the gelled zinc negative electrode when the battery was impacted was investigated. Are shown in (Table 1).
【0015】[0015]
【表1】 [Table 1]
【0016】(表1)に示す結果より、本発明である実
施例はゲル状亜鉛負極が溢れてもまったく電圧の低下は
みられず、このような電池使用状況下でも安定した品質
が確保できた。また、比較例において電圧低下がみられ
た電池はゲル状亜鉛負極が正極合剤上に溢れており、発
熱を伴っていた。From the results shown in (Table 1), in the example of the present invention, no voltage drop was observed even when the gelled zinc negative electrode overflowed, and stable quality could be ensured even under such battery usage conditions. It was Further, in the battery in which the voltage drop was observed in the comparative example, the gelled zinc negative electrode overflowed on the positive electrode mixture and was accompanied by heat generation.
【0017】なお、本実施例、比較例では液状シール
剤、シール剤ともにスルフォン化ポリエチレンを使用し
たが、電気絶縁性を有し、耐アルカリ性のあるピッチ
系、ブタジエン系のものも、同様の効果を示した。Although sulfonation-type polyethylene was used for both the liquid sealing agent and the sealing agent in this example and the comparative example, the same effect can be obtained for the pitch-based and butadiene-based materials which have electric insulation and are alkali resistant. showed that.
【0018】[0018]
【発明の効果】以上詳述したように、本発明を用いれば
アルカリ電池の製造過程および使用中にゲル状亜鉛負極
がカップ状セパレータから溢れても放電性能や電圧の低
下や発熱、漏液を防止し、良品質のアルカリ電池を提供
できる。As described in detail above, according to the present invention, even if the gelled zinc negative electrode overflows from the cup-shaped separator during the production process and use of the alkaline battery, the discharge performance, the voltage drop, the heat generation, and the leakage of the liquid may occur. And can provide good quality alkaline batteries.
【図1】本発明に用いたアルカリ電池LR6の半断面図FIG. 1 is a half sectional view of an alkaline battery LR6 used in the present invention.
1 正極合剤 2 ゲル状亜鉛負極 3 セパレータ 4 負極集電体 5 正極端子キャップ 6 金属ケース 7 ラベル外装 8 ガスケット 9 底板 10 絶縁ワッシャー 11 シール剤 12 液状シール剤 1 Positive Electrode Mixture 2 Gel Zinc Negative Electrode 3 Separator 4 Negative Electrode Current Collector 5 Positive Electrode Terminal Cap 6 Metal Case 7 Label Exterior 8 Gasket 9 Bottom Plate 10 Insulating Washer 11 Sealant 12 Liquid Sealant
Claims (1)
ル状亜鉛負極を電池の中心部に設定し、この負極の外周
にセパレータを介して設定された正極合剤とを備えてな
るアルカリ電池であって、上記正極合剤の開放部分であ
る、正極合剤表面層から金属ケース内側面のガスケット
当接部迄の部分を電気絶縁性を有し、耐アルカリ性の液
状シール剤で被覆されているアルカリ電池。1. An alkaline battery in which a gelled zinc negative electrode made of zinc alloy powder is set as a negative electrode active material at the center of the battery, and a positive electrode mixture is provided on the outer periphery of the negative electrode via a separator. That is, the open part of the positive electrode mixture, that is, the part from the positive electrode mixture surface layer to the gasket contacting part on the inner surface of the metal case is electrically insulated and covered with an alkali-resistant liquid sealant. Alkaline battery.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20968194A JPH0877987A (en) | 1994-09-02 | 1994-09-02 | Alkaline battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20968194A JPH0877987A (en) | 1994-09-02 | 1994-09-02 | Alkaline battery |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0877987A true JPH0877987A (en) | 1996-03-22 |
Family
ID=16576864
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20968194A Pending JPH0877987A (en) | 1994-09-02 | 1994-09-02 | Alkaline battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0877987A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019192551A (en) * | 2018-04-26 | 2019-10-31 | Fdk株式会社 | Alkaline battery |
-
1994
- 1994-09-02 JP JP20968194A patent/JPH0877987A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019192551A (en) * | 2018-04-26 | 2019-10-31 | Fdk株式会社 | Alkaline battery |
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