JPS60157166A - Device for detecting the specific gravity and the liquid level of electrolyte in storage battery - Google Patents
Device for detecting the specific gravity and the liquid level of electrolyte in storage batteryInfo
- Publication number
- JPS60157166A JPS60157166A JP59012550A JP1255084A JPS60157166A JP S60157166 A JPS60157166 A JP S60157166A JP 59012550 A JP59012550 A JP 59012550A JP 1255084 A JP1255084 A JP 1255084A JP S60157166 A JPS60157166 A JP S60157166A
- Authority
- JP
- Japan
- Prior art keywords
- float
- specific gravity
- detection
- liquid level
- gas
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/484—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring electrolyte level, electrolyte density or electrolyte conductivity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は蓄電池の電解液比重および液面の低下等を検出
する電解液比重・液面検出装置の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an electrolyte specific gravity/liquid level detection device for detecting a decrease in electrolyte specific gravity and liquid level of a storage battery.
従来、電解液比重・液面検出装置のコンパクト化のため
に、特開昭５５−１４０８２７号公報に示されるように
、検出電極より電気分解で発生するガスを比重、液面位
にて移動するフロートでもって前記検出電極の先端検出
部に溜めて気相を構成し、該気相で検出電極と電解液と
の接触を解（ようにして、検出電極に流れる検出電流を
ＯＮ、ＯＦＦさせ、検出電極と電解液との接触、ｍ１２
を電気的に検出する方法の電解液比重・液面検出装置（
以下、ガス式比重・液面検出Ｐｉ置と呼ぶ）が提案され
ている。Conventionally, in order to make the electrolyte specific gravity/liquid level detection device more compact, as shown in Japanese Patent Application Laid-Open No. 55-140827, gas generated by electrolysis is transferred from the detection electrode at the specific gravity and liquid level. A gas phase is formed by accumulating in the tip detection part of the detection electrode with a float, and the contact between the detection electrode and the electrolyte is broken in the gas phase (thus, the detection current flowing through the detection electrode is turned on and off, Contact between sensing electrode and electrolyte, m12
Electrolyte specific gravity/liquid level detection device that electrically detects
A method (hereinafter referred to as a gas type specific gravity/liquid level detection Pi position) has been proposed.
しかるにかかるガス式比重・液面検出装置では、フロー
トのコンパクト化にともない、検出電極の先端検出部に
ガスが蓄積された後、比重、液面が規定値以上に戻って
もフロートが上昇しなくなるという欠点があった。これ
は比重、液面規定値以上の再検出の機能が失われること
であり、極めて重大な欠点である。この原因はガスによ
る気相界面の表面張力がフロー［・と液との間の付着力
を介して働き、フロートを上昇させない力となり、この
力がフロートの浮力より強くなることにある。However, in such a gas-type specific gravity/liquid level detection device, as the float becomes more compact, the float no longer rises even if the specific gravity and liquid level return to above specified values after gas accumulates at the tip detection part of the detection electrode. There was a drawback. This is a very serious drawback as the function of re-detecting specific gravity and liquid level above the specified values is lost. The reason for this is that the surface tension at the gas phase interface due to the gas acts through the adhesive force between the flow and the liquid, creating a force that prevents the float from rising, and this force becomes stronger than the buoyant force of the float.
したがって、比重、液面規定値以上の再検出機能を維持
するためには、ガスによる気相界面の表面張）Ｊのフロ
ートに与える影響を減少させることが必要となる。この
方法の１つとしてガスの放出をフロートとフロートのガ
イド部との間より行なうことにより、ガスの浮力を有効
に利用するこ上が考えられる。Therefore, in order to maintain the re-detection function of specific gravity and liquid level above the specified values, it is necessary to reduce the influence of the gas on the float of the surface tension (J) at the gas phase interface. One possible method for this is to effectively utilize the buoyancy of the gas by releasing the gas from between the float and the guide section of the float.
本発明は上記した如き事柄に鑑み、ガス式化重液面検出
装置のコンパクト化に関する具体的構造を提供するもの
である。In view of the above-mentioned problems, the present invention provides a concrete structure for downsizing a gas type heavy liquid level detection device.
即し、本発明は先端検出部以外が絶縁材で被覆された検
出電極と、前記絶縁材の下端外周をガイド部としてこの
ガイド部に上下動自在に装着され、下降時に前記検出ｆ
ｆｌ極より発生するガスを溜めて気相を構成し、該気相
で前記検出電極の先端検出部を覆うように動作する比重
・液面位にて移動するフロートとを右づ−る蓄電池の電
解液比重・液面検出装置において、前記ガイド部または
フロートの少なくとも一方に切り欠き部を形成し、前記
フロートが最下端まで沈降した時のみ前記切り欠き部を
閉鎖させ、前記フロー１〜が最下端まで沈降しない時は
前記切り欠き部を開放してガイド部とフロー１〜との間
にガスの放出路を形成するようにした構造にすること・
により、フロートが沈降しうる最下端まで沈降した時の
みガスを検出電極の先端検出部周辺に溜め、フロートが
最下端より０．５〜２．０ｍｍ上昇１ればガスが前記切
り欠き部を通って上方へ１ムけるにうにしたものである
。That is, the present invention includes a detection electrode whose portion other than the tip detection portion is covered with an insulating material, and a lower end outer periphery of the insulating material as a guide portion, which is attached to the guide portion so as to be movable up and down, and when lowered, the detection electrode is covered with an insulating material.
The gas generated from the fl pole is stored to form a gas phase, and a float that moves according to the specific gravity and liquid level operates to cover the tip detection part of the detection electrode with the gas phase. In the electrolyte solution specific gravity/liquid level detection device, a notch is formed in at least one of the guide part or the float, and the notch is closed only when the float sinks to the lowest point, so that the flows 1 to 1 are the lowest. When the flow does not settle to the lower end, the cutout portion is opened to form a gas release path between the guide portion and the flow 1~.
Therefore, only when the float has descended to the lowest point where it can sink, gas is accumulated around the detection part at the tip of the detection electrode, and when the float rises 0.5 to 2.0 mm from the lowest point1, gas passes through the notch. It is arranged so that it moves one meter upwards.
以下、図面を用いて本発明を具体的に説明する。Hereinafter, the present invention will be specifically explained using the drawings.
第１図は従来のこの種ガス式比重・液面検出装置の一例
並びにその動作状態を、第２図は本発明の一実施例並び
にその動作状態をそれぞれ示すもので、各図中の（ａ
）は比重、液面が規定値以上の時、（ｂ）は比重が規定
値以下の時、（Ｃ）はガス蓄積された後、比ｍ１液面が
規定値以上になった直後の状態を示すものである。また
第１図および第２図において、１は検出電極で、先端検
出部下以外は合成樹脂等よりなる絶縁材で被覆されてい
る。なお、絶縁材２は後述するフロートのガイド部とし
て働くので、以下、絶縁材２をガイド部２と呼ぶ。３は
フロートで、ガイド部２の下端外周に上下動自在に装着
されており、沈降時に検出用４ｉ１より電気分解で発生
するガスを溜めて検出電極１の先端検出部下に気相を形
成し、検出電極１と電解液との接触を解くように作用す
る。４はフロート３に形成された切り欠ぎ部、５はガイ
ド部２に形成された切り欠き部で、切り欠き部４と５は
対応するように配置されている。また切り欠き部４と５
はフロート３が沈降しうる最下端まで沈降した時、第２
図の（ｂ）に示すように閉鎖されるＪ：うになっている
。６は発生ガスによる気相、７は電解液である。Fig. 1 shows an example of a conventional gas type specific gravity/liquid level detection device and its operating state, and Fig. 2 shows an embodiment of the present invention and its operating state.
) is when the specific gravity and liquid level are above the specified value, (b) is when the specific gravity is below the specified value, and (C) is the state immediately after the ratio m1 liquid level has exceeded the specified value after gas has been accumulated. It shows. Further, in FIGS. 1 and 2, reference numeral 1 denotes a detection electrode, and the portion other than the portion below the detection tip is covered with an insulating material made of synthetic resin or the like. In addition, since the insulating material 2 works as a guide part of the float mentioned later, the insulating material 2 is called the guide part 2 hereafter. 3 is a float, which is attached to the outer periphery of the lower end of the guide part 2 so as to be able to move up and down, and collects gas generated by electrolysis from the detection 4i1 during sedimentation to form a gas phase below the detection tip of the detection electrode 1; It acts to break the contact between the detection electrode 1 and the electrolyte. 4 is a notch formed in the float 3, 5 is a notch formed in the guide part 2, and the notches 4 and 5 are arranged so as to correspond to each other. Also, notches 4 and 5
When float 3 has sunk to the lowest point it can sink, the second
As shown in (b) of the figure, it is closed. 6 is a gas phase due to generated gas, and 7 is an electrolytic solution.
従来のガス式比重・液面検出装置および本発明実施例で
は、検出電極１を蓄電池の端子等に接続しておくと、比
重および液面が規定値以上の場合には、第１図の（ａ
）および第２図の（ａ ）に示す如く、フロート３は浮
」ニジて検出電極１の先端検出部下が電解液７中に露出
された状態となる。In the conventional gas-type specific gravity/liquid level detection device and the embodiment of the present invention, if the detection electrode 1 is connected to the terminal of a storage battery, etc., when the specific gravity and liquid level are above the specified values, the ( a
) and as shown in FIG. 2(a), the float 3 floats and the lower end of the detection electrode 1 is exposed in the electrolyte 7.
この状態においては検出電極１の先端検出部下と電解液
７が接触し、検出電極１に検出電流が流れ、比重、液面
が規定値以上にあることを示す。またこの状態の時、検
出電極１の先端検出部下からは電気分解によりガスが発
生しているが、このガスはほとんど上方に放出される。In this state, the tip detection portion of the detection electrode 1 and the electrolytic solution 7 are in contact with each other, and a detection current flows through the detection electrode 1, indicating that the specific gravity and liquid level are above the specified values. Further, in this state, gas is generated by electrolysis from below the detection end of the detection electrode 1, but most of this gas is emitted upward.
その後、比重がツ５１定値以下に４すると、第１図の（
ｂ）おにび第２図の（ｂ）に示す如く、フロート３が沈
降し、ガスが検出電極１の先※；１：検出部丁周辺で蓄
積され、気相６を形成する。この状態においては検出電
極１の先端検出部下と電解液７どの接触は気相６により
解かれ、検出電極１には検出電流が流れなくなり、比重
が規定値以下になったことを示す。After that, when the specific gravity falls below the constant value, (
b) As shown in FIG. 2(b), the float 3 sinks, and gas accumulates around the detection electrode 1 and forms a gas phase 6. In this state, the contact between the sensing portion of the tip of the sensing electrode 1 and the electrolyte 7 is broken by the gas phase 6, and the sensing current no longer flows through the sensing electrode 1, indicating that the specific gravity has fallen below the specified value.
その後、比重が規定値以上に戻ると、フロート３は上界
しはじめるが、従来のものにおいては第１図の（Ｃ）に
示す如く、気相６の体積は変化しないため、気相６と電
解液７の界面面積は徐々に大きくなる。この界面面積を
小さくしようとする表面張力がフロート３に濡れによる
付着力を介して働き、フロート３は下方にひっばられる
。そのためフローｈ ３の浮力が十分でない場合、フロ
ート３は上昇できないことになり、比重、液面が規定値
以上にあるのにかかわらず検出電極１には検出電流が流
れないといった欠点が生じる。これに対して本発明実施
例においては第２図の（Ｃ）に示す如く、フロート３が
沈降しうる最下端より０．５〜２．０ＩＩ１ｍ上昇すれ
ば、ガス（気相６）はフロート３の切り欠き部４とガイ
ド２の切り欠き部５をガス放出路として、このガス放出
路を通って上方へ抜けることができ、そのためガスの浮
力がフロート３に働いて、フロート３への表面張ツノの
影響は小さくなり、フロート３は容易に上着することが
でき、第２図の（ａ）の状態に戻って比重、液面が規定
値以」二であることを示す。After that, when the specific gravity returns to the specified value or more, the float 3 starts to rise, but in the conventional type, as shown in FIG. 1(C), the volume of the gas phase 6 does not change, so the The interfacial area of the electrolyte 7 gradually increases. The surface tension that tries to reduce this interface area acts on the float 3 through the adhesive force due to wetting, and the float 3 is pulled downward. Therefore, if the buoyancy of the flow h3 is not sufficient, the float 3 will not be able to rise, resulting in the drawback that no detection current will flow through the detection electrode 1 even though the specific gravity and liquid level are above specified values. On the other hand, in the embodiment of the present invention, as shown in FIG. The gas can escape upward through the notch 4 of the guide 2 and the notch 5 of the guide 2, and the buoyancy of the gas acts on the float 3, increasing the surface tension on the float 3. The influence of the horns becomes smaller, and the float 3 can be easily placed on top, returning to the state shown in FIG. 2(a), indicating that the specific gravity and liquid level are above the specified values.
なお、第２図の本発明実施例では、比重、液面が規定値
以下の状態でガスにより検出電流をＯＦＦさせた後、比
重、液面が規定値以上の状態になった際、フロートが容
易に０，５〜２．Ｏｍｍ上胃１ることが前提であるが、
フロート下部に生じた電解液と気相との界面の表面張力
の影響を最小にすることが望ましい。そのためにはフロ
ートが最下端まで沈降した時のフロート最下端より １
．０ｍｍ以−以上方に検出電極の下端を位置させ、且つ
フロートのガス溜め部水平断面面積をフロート最下端よ
り上方に３ｍｍの範囲で一定に、または上方はど増大さ
せることが望ｊ、しい。即ち、フロートと気相界面の接
Ｊる部分をフロート最下端より上方にあり、且つフロー
トのガス溜め部の水平断面面積が一定に、または上方に
なるほど増大すれば、フロート下部の気相界面の表面張
力は、断面積一定の場合にはフロート上昇を妨げないし
、断面積が上方はど増大する場合にはフロートＴＲの補
助となる。In addition, in the embodiment of the present invention shown in FIG. 2, after the detection current is turned off by gas when the specific gravity and liquid level are below the specified values, when the specific gravity and the liquid level become above the specified values, the float is turned off. Easily 0.5-2. It is assumed that the upper stomach is 1 mm,
It is desirable to minimize the influence of surface tension at the interface between the electrolyte and the gas phase that occurs below the float. To do this, from the lowest point of the float when the float has sunk to the lowest point,
．． It is desirable to position the lower end of the detection electrode at a distance of 0 mm or more, and to increase the horizontal cross-sectional area of the gas reservoir portion of the float to a constant value within a range of 3 mm above the lowest end of the float, or to increase the area upward. In other words, if the contact area between the float and the gas phase interface is located above the bottom end of the float, and the horizontal cross-sectional area of the gas reservoir of the float is constant or increases as it moves upward, then the gas phase interface at the bottom of the float Surface tension does not prevent the float from rising when the cross-sectional area is constant, and assists the float TR when the cross-sectional area increases upward.
第３図は本発明の他実施例を示すもので、かかる本発明
実施例はガイド部２に切り欠き部５を形成すると共に、
該切り欠き部５の幅を下方に行く【Ｊど小さくし、且つ
フロート３にガイド部２の切り欠き部５の下端を閉鎖す
るための突起８を設けたものである。したがってフロー
ト３が最下端まで沈降した時には切り欠き部５は突起８
により閉鎖され、フロート３が最下端より上背した時に
は切り欠き部５は開放されるようになっている。またか
かる実施例においても第２図の実施例と同じように動作
し、同じ作用効果を得ることができる。FIG. 3 shows another embodiment of the present invention, in which a cutout portion 5 is formed in the guide portion 2, and
The width of the notch 5 is made smaller in the downward direction, and a protrusion 8 is provided on the float 3 to close the lower end of the notch 5 of the guide part 2. Therefore, when the float 3 sinks to the lowest end, the notch 5 becomes the protrusion 8.
When the float 3 is raised above the lowermost end, the notch 5 is opened. Further, this embodiment also operates in the same manner as the embodiment shown in FIG. 2, and the same effects can be obtained.
第４図および第５図は本発明の他実施例を示すもので、
かかる本発明実施例はフロー１〜３に切り欠き部４を形
成すると共に、該切り欠き部４の幅を上方に行くほど小
さクシ、且つガイド部２にフロート３の切り欠き部４の
上端を閉鎖するための突起９を設けたものである。した
がってフロート３が最下端まで沈降した時には切り欠き
部４は突起９により閉鎖され、フロート３が最下端より
上界した時には切り欠き部４は開放されるようになって
いる。またかかる実施例においても第２図の実施例と同
じように動作し、同じ作用効果を得ることができる。4 and 5 show other embodiments of the present invention,
In this embodiment of the present invention, the notches 4 are formed in the flows 1 to 3, and the width of the notches 4 becomes smaller as they go upward, and the upper end of the notches 4 of the floats 3 is formed in the guide part 2. It is provided with a protrusion 9 for closing. Therefore, when the float 3 descends to the lowest end, the notch 4 is closed by the protrusion 9, and when the float 3 rises above the lowest end, the notch 4 is opened. Further, this embodiment also operates in the same manner as the embodiment shown in FIG. 2, and the same effects can be obtained.
以上述べたように本発明によれば、ガス式比ｍ・液面検
出装置におけるフロート等のコンパクト化を、比重、液
面規定値以上の再検出□能を損うことなく行なうことが
できる。As described above, according to the present invention, the float and the like in the gas ratio m/liquid level detection device can be made more compact without impairing the ability to re-detect specific gravity and liquid level above specified values.
第１図は従来のこの種比重・液面検出装置の一例並びに
その動作状態を示す断面図、第２図は本発明の一実施例
並びにその動作状態を示す断面図、第３図本発明の他実
施例を示す一部切欠斜視図、第４図は同じく本発明の他
実施例を示す底面図、第５図は第４図のＡ−Ａ線断面図
である。
１・・・検出部（セ、２・・・先端検出部、３・・・フ
ロート、４．５・・・切り欠き部、６・・・気相代理人
弁理士 鈴木 彬Fig. 1 is a cross-sectional view showing an example of a conventional specific gravity/liquid level detection device of this type and its operating state, Fig. 2 is a cross-sectional view showing an embodiment of the present invention and its operating state, and Fig. 3 is a cross-sectional view showing an embodiment of the present invention. FIG. 4 is a bottom view showing another embodiment of the present invention, and FIG. 5 is a sectional view taken along the line A--A in FIG. 4. 1... Detection part (Se, 2... Tip detection part, 3... Float, 4.5... Notch part, 6... Gas phase agent Patent attorney Akira Suzuki
Claims (2)
と、前記絶縁材の下端外周をガイド部としてこのガイド
部に上下動自在に装着され、下降時に前記検出電極より
発生するガスを溜めて気相を構成し、該気相で前記検出
′Ｆｉ極の先端検出部を覆うように動作する比重・液面
位にて移動するフロートとを有する蓄電池の電解液比重
・液面検出装置において、前記ガイド部またはフロート
の少なくとも一方に切り欠き部を形成し、前記フロート
が最下端まで沈降した時のみ前記切り欠き部を閉鎖させ
、前記フロートが最下端まで沈降しない時は前記切り欠
き部を開放してガイド部とフローＬ−にの間にガスの放
出路を形成するようにした構造を備える蓄電池の電解液
比重・液面検出装置。(1) A detection Ti electrode whose parts other than the tip detection part are covered with an insulating material, and the outer periphery of the lower end of the insulating material is used as a guide part and is attached to this guide part so as to be able to move up and down, and when it is lowered, the gas generated from the detection electrode is An electrolyte specific gravity/liquid level detection device for a storage battery, comprising a float that moves at a specific gravity/liquid level level that accumulates to form a gas phase and operates to cover the tip detection part of the detection 'Fi electrode with the gas phase. A notch is formed in at least one of the guide part or the float, and the notch is closed only when the float descends to the lowest end, and when the float does not descend to the lowest end, the notch is closed. A storage battery electrolyte specific gravity/liquid level detection device having a structure in which a gas discharge path is formed between a guide portion and a flow L- by opening the .
端より １．０ＩＩＩｍ以上上方に検出電極の下端を位
置させ、旧つフロートのガス溜め部水平断面面積をフロ
ート最下端より上方に３ｎ＋ｍの範囲で一定に、または
上方はど増大させてなる構造の特許請求の範囲第（１）
項に記載の蓄電池の電解液比重・液面検出装置。(2) Position the lower end of the detection electrode at least 1.0IIIm above the lowest end of the float when the float has sunk to the lowest end, and set the horizontal cross-sectional area of the gas reservoir of the old float to a range of 3n+m above the lowest end of the float. Claim No. (1) of a structure consisting of a constant value or an upwardly increasing value
The electrolyte specific gravity and liquid level detection device for a storage battery as described in 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59012550A JPS60157166A (en) | 1984-01-25 | 1984-01-25 | Device for detecting the specific gravity and the liquid level of electrolyte in storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59012550A JPS60157166A (en) | 1984-01-25 | 1984-01-25 | Device for detecting the specific gravity and the liquid level of electrolyte in storage battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60157166A true JPS60157166A (en) | 1985-08-17 |
| JPH0544785B2 JPH0544785B2 (en) | 1993-07-07 |
Family
ID=11808438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59012550A Granted JPS60157166A (en) | 1984-01-25 | 1984-01-25 | Device for detecting the specific gravity and the liquid level of electrolyte in storage battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60157166A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161380A (en) * | 1979-06-04 | 1980-12-15 | Japan Storage Battery Co Ltd | Specific gravity detector for electrolyte for storage battery |
-
1984
- 1984-01-25 JP JP59012550A patent/JPS60157166A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55161380A (en) * | 1979-06-04 | 1980-12-15 | Japan Storage Battery Co Ltd | Specific gravity detector for electrolyte for storage battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0544785B2 (en) | 1993-07-07 |
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