JP4984477B2 - Lead acid battery - Google Patents

Lead acid battery Download PDF

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JP4984477B2
JP4984477B2 JP2005288690A JP2005288690A JP4984477B2 JP 4984477 B2 JP4984477 B2 JP 4984477B2 JP 2005288690 A JP2005288690 A JP 2005288690A JP 2005288690 A JP2005288690 A JP 2005288690A JP 4984477 B2 JP4984477 B2 JP 4984477B2
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lead
acid battery
path
opening
exhaust hole
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JP2007103076A (en
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宏 井町
恭秀 中山
さわ子 高橋
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GS Yuasa International Ltd
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    • 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

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  • Sealing Battery Cases Or Jackets (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)

Description

本発明は鉛蓄電池に関するものであり、特に、電槽または電槽蓋の帯電による障害が防止できる形状に関するものである。 The present invention relates to a lead-acid battery, and particularly relates to a shape that can prevent a failure caused by charging of a battery case or a battery case lid.

鉛蓄電池は、過充電を行なうと、活物質の充電反応とは別に副反応として電解液中の水が電気分解して正極板より酸素が、負極板より水素が発生し、これらはそのセル内上部の空間に滞留する。
特許文献１には、鉛蓄電池の排気筒にゴムパッキンを介して液口栓を嵌合させ、液口栓と排気筒との嵌合部分における、ゴムパッキンからの距離を、帯電する最大静電気電圧に対して火花放電を発生させない距離とするものが開示されている。すなわち、ゴムパッキンを介在させることによってセル内外の液密性と気密性を高めることができるので、点検、交換、清掃、運搬などの作業中に鉛蓄電池の帯電があり、これに反対電荷を持った物体あるいは一端をアースした非導電性の物体などが接近しても放電路を形成されないようにしている。
特開２００２−４２７８２号公報 特許文献２には、鉛蓄電池の電槽蓋の合成樹脂に表面固有抵抗値が１０12Ω以下、１０8Ω以上になるようにカーボンブラックを混入したものを用いることが開示されている。すなわち、このような合成樹脂を用いることによって電槽蓋の加工性や成形性を損なうことなく、電槽蓋に電荷が蓄積されないようにしている。 特開昭５９−２１１９５４号公報 また、このような問題に対しては、上記特許文献１、２以外に、たとえば、鉛蓄電池の内圧が規定値以上に上昇した場合にセル内のガスを放出する排気弁を備えた液口栓を用いたり、ガスの排出経路となる液口栓の内部にフィルターを取り付けたり、といったことが行われている。 When lead-acid batteries are overcharged, water in the electrolyte is electrolyzed as a side reaction in addition to the charge reaction of the active material, generating oxygen from the positive electrode plate and hydrogen from the negative electrode plate. It stays in the upper space.
In Patent Document 1, a liquid plug is fitted to an exhaust cylinder of a lead-acid battery via a rubber packing, and a distance from the rubber packing at a fitting part between the liquid plug and the exhaust cylinder is charged as a maximum electrostatic voltage. In contrast, a distance that does not cause a spark discharge is disclosed. In other words, the liquid and air tightness inside and outside the cell can be increased by interposing the rubber packing, so the lead storage battery is charged during work such as inspection, replacement, cleaning, and transportation, and has an opposite charge to this. A discharge path is prevented from being formed even when an object or a non-conductive object with one end grounded approaches.
Japanese Patent Application Laid-Open No. 2002-42782 discloses that a synthetic resin for a battery case lid of a lead-acid battery is mixed with carbon black so that the surface specific resistance is 10 <12> [Omega] or less and 10 <8> [Omega] or more. Yes. That is, by using such a synthetic resin, electric charges are not accumulated in the battery case lid without impairing the workability and moldability of the battery case lid. JP, 59-211954, A In addition to the above-mentioned patent documents 1 and 2, for example, when the internal pressure of a lead storage battery rises above a specified value, the gas in the cell is released. For example, a liquid plug provided with an exhaust valve is used, or a filter is attached to the inside of the liquid plug used as a gas discharge path.

また、鉛蓄電池の表面や接続部の清掃の際には、あらかじめ作業者の静電気を除去したうえで、帯電しやすい乾いた布や化繊の布を用いたり、はたきがけをしたり、といったことをせずに、湿った布を用いて清掃をし、電池の運搬時には、ビニールシートなどの帯電しやすいシート類で覆わないようにするなどの対策が講じられるとともに、取扱説明書によって注意、警告をするなどの対策が講じられてきた。
また、鉛蓄電池に対しても、セル内上部の空間にビーズを充填したり、セル内上部の空間でポリウレタンを発泡させたり、といった手段を講じて、セル内の上部空間にガスが充満しないように、該空間の容積を減少させることも行われてきた。 Also, when cleaning the surface of lead-acid batteries and connection parts, remove static electricity from the operator in advance, and use dry cloth or synthetic cloth that is easy to be charged or brushing. Instead, take measures such as cleaning with a damp cloth so that the battery is not covered with sheets that are easily charged, such as vinyl sheets. Measures such as doing have been taken.
In addition, for lead-acid batteries, measures such as filling beads in the upper space in the cell or foaming polyurethane in the upper space in the cell should not fill the upper space in the cell with gas. In addition, the volume of the space has been reduced.

上記した種々の対策を講じても、特許文献１の場合には、電解液が液口栓と排気筒との嵌合面を通して這い上がってゴムパッキンの下面に達していると、前述した放電路が形成されることがあり、特許文献２の場合には、電槽蓋の帯電は防止できるが、電槽の帯電まで防止できるものではない。   Even if the above-mentioned various measures are taken, in the case of Patent Document 1, if the electrolyte crawls up through the fitting surface between the liquid stopper and the exhaust tube and reaches the lower surface of the rubber packing, the above-described discharge path In the case of Patent Document 2, charging of the battery case lid can be prevented, but charging of the battery case cannot be prevented.

上記した課題に鑑み、本発明は、這い上がった電解液がゴムパッキンの下面に達していたり、また電槽蓋がこのような電解液によって濡れていたりしていると、前述した放電路が形成されやすいことに着目し、このような電解液があっても、放電路が形成されないようにしたものである。すなわち、各セルに対応した排気孔を電槽蓋に設け、前記電槽蓋の上面に、排気孔全体を覆うシートが、その周縁の一部に断面積が実質的にゼロである開口を形成して、前記排気孔からの排気のための経路を形成するように貼着され、電槽または電槽蓋の帯電時に開口から排気孔に至る放電路が形成されないようにしたことを特徴とする鉛蓄電池（請求項１）であり、前記排気のための経路の長さを少なくとも１４ｍｍを超えるようにしたことを特徴とする鉛蓄電池（請求項２）であり、前記シートは、一部に電解液を保持するための電解液保持体が充填された突出部を有し、この突出部が前記シートの貼着によって形成される経路に位置していることを特徴とする鉛蓄電池（請求項３）であり、前記電槽蓋は、一部に電解液を保持するための電解液保持体が充填された凹部を有し、この凹部がシートの貼着によって形成される経路に位置していることを特徴とする鉛蓄電池（請求項４）であり、前記突出部または凹部から開口までの経路の長さを少なくとも１４ｍｍを超えるようにしたことを特徴とする鉛蓄電池（請求項５）である。 In view of the above-described problems, the present invention provides the above-described discharge path when the scooped electrolyte reaches the lower surface of the rubber packing or the battery case lid is wetted by such electrolyte. Focusing on the fact that the discharge path is easily formed, a discharge path is not formed even if such an electrolyte is present. That is, an exhaust hole corresponding to each cell is provided in the battery case lid, and a sheet covering the entire exhaust hole is formed on the upper surface of the battery case cover, and an opening having a substantially zero cross-sectional area is formed in a part of the periphery thereof. and, wherein it is adhered to form a path for exhaust from the exhaust hole, wherein the discharge path leading to the exhaust hole from the opening is prevented from being formed during the charging of the battery container or the container lid A lead-acid battery (Claim 1), wherein the length of the exhaust path is at least 14 mm, and the sheet is partially electrolyzed. A lead-acid battery characterized in that it has a protrusion filled with an electrolytic solution holder for holding a liquid, and the protrusion is located in a path formed by adhering the sheet. And the battery case lid holds the electrolyte in part It is a lead acid battery (Claim 4), characterized in that it has a recess filled with an electrolytic solution holder, and the recess is located in a path formed by sticking a sheet. A lead-acid battery (Claim 5) characterized in that the length of the path from the opening to the opening exceeds at least 14 mm.

請求項１〜５記載の発明によれば、排気孔全体を覆うシートの周縁の一部に開口を形成し、排気孔と開口との間を排気のための経路としているから、該経路の電気抵抗を高くすることができ、電槽または電槽蓋が帯電しても、開口から排気孔に至る経路または開口から突出部もしくは凹部に至る経路に放電路が形成されないようにすることができる。 According to the first to fifth aspects of the present invention, the opening is formed in a part of the peripheral edge of the sheet covering the entire exhaust hole, and the space between the exhaust hole and the opening is used as the exhaust path. The resistance can be increased, and even if the battery case or the battery case lid is charged, it is possible to prevent a discharge path from being formed in the path from the opening to the exhaust hole or the path from the opening to the protrusion or the recess.

以下、本発明を、その実施の形態に基づいて説明する。   Hereinafter, the present invention will be described based on the embodiments.

図１は本発明に係る実施の形態に係る鉛蓄電池を示し、図１（ａ）は全体図を、図１（ｂ）は要部拡大図を示す。図１の鉛蓄電池１は、内部に極板群を収納するセルを有する電槽２が、前記セルに対応して設けられた排気孔６を備えた電槽蓋３によって密閉されてなり、かつ前記電槽蓋３には、シート１０を、前記排気孔６全体を覆い、周縁の一部に幅が３０ｍｍの開口５が形成され、この開口５と排気孔６との間に排気のための経路４が形成されるように、経路４と開口５以外で前記シート１０を電槽蓋２に貼着するようにしたもので、排気孔６から排出される酸素や水素が経路４を通して排気できるようにしている。   FIG. 1 shows a lead storage battery according to an embodiment of the present invention, FIG. 1 (a) shows an overall view, and FIG. 1 (b) shows an enlarged view of a main part. The lead-acid battery 1 in FIG. 1 is formed by sealing a battery case 2 having a cell containing an electrode plate group therein with a battery case lid 3 having an exhaust hole 6 provided corresponding to the cell, and An opening 5 having a width of 30 mm is formed in a part of the peripheral edge of the battery case cover 3 so as to cover the entire exhaust hole 6, and between the opening 5 and the exhaust hole 6 for exhausting. The sheet 10 is attached to the battery case lid 2 other than the path 4 and the opening 5 so that the path 4 is formed. Oxygen and hydrogen discharged from the exhaust hole 6 can be exhausted through the path 4. I am doing so.

上記した鉛蓄電池１では、開口５と経路４をシート１０が電槽蓋３に貼着されないようにして形成しているため、開口５の断面積は実質的にゼロで、電槽２または電槽蓋３の帯電時に、開口５から排気孔６に至る経路４に放電路が形成されるかどうかは、経路４の長さと開口５の幅に基づいて考えることができる。   In the lead-acid battery 1 described above, since the opening 5 and the path 4 are formed so that the sheet 10 is not attached to the battery case lid 3, the cross-sectional area of the opening 5 is substantially zero. Whether or not a discharge path is formed in the path 4 from the opening 5 to the exhaust hole 6 when the tank lid 3 is charged can be considered based on the length of the path 4 and the width of the opening 5.

以下、上記した「放電路が形成されるかどうか」を確認するため、排気孔を有した排気弁のゴムパッキン下面を電解液で濡らした、公称電圧が１２Ｖで、公称容量が５０ＡＨの動力車用の密閉形鉛蓄電池と、ゴムパッキン下面を濡らしていない同じ密閉形鉛蓄電池をそれぞれ準備し、両方に上述した絶縁性シートを、その開口から排気孔までの長さ（距離）を、電解液で濡らしたものは１ｍｍ、２ｍｍ、３ｍｍ、４ｍｍ、５ｍｍ、１０ｍｍ、１５ｍｍ、２０ｍｍになるように、電解液で濡らしていないものは１ｍｍ、２ｍｍ、３ｍｍ、１０ｍｍになるように貼着するとともに、それぞれの長側面に静電気発生装置（シシド静電気株式会社製ＳＴＡＴＩＬＥＲ ２０−ＤＰ）で発生させたマイナス電荷を電槽に帯電させることができるようにアルミニウム板を貼付し、一端を排気弁のゴムパッキン下面に接続し、他端を４８Ωの抵抗を介して接地してから、５Ａの定電流で１１時間の充電を行った後、１５時間後に、温度が２４℃、湿度が３８％の雰囲気下で、５Ａの定電流充電を３０分間行う過程で、以下の条件の実験を行った。   Hereinafter, in order to confirm the above-mentioned “whether or not a discharge path is formed”, a power vehicle having a nominal voltage of 12 V and a nominal capacity of 50 AH, in which the rubber packing lower surface of an exhaust valve having an exhaust hole is wetted with an electrolyte. Prepare the sealed lead-acid battery for use and the same sealed lead-acid battery that does not wet the bottom surface of the rubber packing, and install the insulating sheet mentioned above on both, the length (distance) from the opening to the exhaust hole, electrolyte 1mm, 2mm, 3mm, 4mm, 5mm, 10mm, 15mm, 20mm, and those not wetted with electrolyte solution are 1mm, 2mm, 3mm, 10mm, respectively. A negative charge generated by a static electricity generator (STATILER 20-DP manufactured by Sicid Electrostatic Co., Ltd.) is placed on the long side of the battery so that the battery case can be charged. After attaching a minium plate, one end was connected to the lower surface of the rubber packing of the exhaust valve, and the other end was grounded through a 48 Ω resistor. After charging for 11 hours at a constant current of 5 A, 15 hours later, An experiment under the following conditions was performed in the process of performing constant current charging at 5 A for 30 minutes in an atmosphere having a temperature of 24 ° C. and a humidity of 38%.

すなわち、充電終了時に水素濃度を水素ガス濃度計（新コスモス電機製ＸＰ−３１４）で測定（６セルのうちの最大値）し、充電終了３０分経過後、前記アルミニウム板を介して鉛蓄電池の電槽を帯電させていって、電槽から排気弁内側のゴムパッキン下面に至る経路の放電路が形成された際の静電気電圧と開口から排気孔までの距離との関係を調査した。調査した結果を図４に示す。なお、充電終了時に測定された水素ガス濃度は排気弁内側で１８％、排気弁外側で０％であった。   That is, at the end of charging, the hydrogen concentration was measured with a hydrogen gas concentration meter (New Cosmos Electric XP-314) (maximum value of 6 cells), and after 30 minutes from the end of charging, the lead storage battery was inserted through the aluminum plate. The relationship between the electrostatic voltage and the distance from the opening to the exhaust hole when the discharge path of the path from the battery case to the lower surface of the rubber packing inside the exhaust valve was formed while the battery case was charged was investigated. The results of the investigation are shown in FIG. The hydrogen gas concentration measured at the end of charging was 18% inside the exhaust valve and 0% outside the exhaust valve.

図４から、ゴムパッキン下面が電解液で濡れているものは、開口から排気孔までの距離を１ｍｍとした場合、静電気電圧が３．５ｋＶで前述した放電路が形成されたのに対し、濡れていないものは、静電気電圧が１５．８ｋＶになるまで放電路は形成されなかった。また、静電気電圧が１６ｋＶの場合、ゴムパッキン下面が電解液で濡れているものは、開口から排気孔までの距離が１４ｍｍ以下であると前述した放電路が形成されることがわかった。また、この試験に供した鉛蓄電池と同材質（ＰＰ樹脂）の電槽および電槽蓋からなる鉛蓄電池を、手に持ったポリカーボネ−トで擦りつけて帯電量を１０回測定したところ、最低値が−２ｋＶ、最高値が−１６ｋＶであった。このことから、上記した１６ｋＶの静電気電圧で前述した放電路が形成されない距離、すなわち、開口から排気孔までの距離が１４ｍｍを超えるようにすることで、前述した放電路の形成が防止できる、と言える。なお、本実施形態では、開口の幅を、考えられる排気弁の最大幅の３０ｍｍにしているが、開口の幅が３０ｍｍより小さくなると、ゴムパッキン下面が電解液で濡れていて、静電気電圧が１６ｋＶの場合で、開口から排気孔までの距離が１４ｍｍ以下でも、放電路が形成されないことが考えられる。しかしながら、このような放電路の形成は鉛蓄電池１の使用環境によって静電気電圧のバラツキが考えられるため、距離は少なくとも１４ｍｍを超えるようにし、可能であれば２０ｍｍ程度にするのが好ましい。
次に、図２（ａ）、（ｂ）に示した鉛蓄電池は、上記した図１の鉛蓄電池に対し、シート１０の一部に幅が３０ｍｍ、長さが３ｍｍの突出部７を設け、この突出部７の内部に電解液を保持するための電解液保持体９を充填し、シート１０の貼着によって形成される経路４の、排気孔から５ｍｍの位置に突出部７の内側がくるようにしたことを特徴とする。なお、この鉛蓄電池は、図１の排気弁の代わりに液口栓を備えた液式（開放形）のものである。
また、図３（ａ）、（ｂ）に示した鉛蓄電池は、図２と同じ液式鉛蓄電池であり、電槽蓋３の一部に幅が３０ｍｍ、長さが３ｍｍの凹部８を設け、この凹部８に電解液を保持するための電解液保持体９を充填し、シート１０の貼着によって形成される経路４の、排気孔から５ｍｍの位置に凹部８の内側がくるようにしたことを特徴とする。 As shown in FIG. 4, when the distance from the opening to the exhaust hole is 1 mm, the lower surface of the rubber packing is wet with the electrolyte. For those that did not, the discharge path was not formed until the electrostatic voltage reached 15.8 kV. Further, it was found that when the electrostatic voltage is 16 kV, the discharge path described above is formed when the distance from the opening to the exhaust hole is 14 mm or less when the lower surface of the rubber packing is wet with the electrolyte. In addition, when a lead storage battery consisting of a battery case and a battery case cover made of the same material (PP resin) as the lead storage battery used in this test was rubbed with a polycarbonate held in the hand, the charge amount was measured 10 times. The value was −2 kV and the maximum value was −16 kV. From this, it is possible to prevent the formation of the above-mentioned discharge path by making the distance at which the above-described discharge path is not formed by the above-described electrostatic voltage of 16 kV, that is, the distance from the opening to the exhaust hole exceeds 14 mm. I can say that. In this embodiment, the width of the opening is set to 30 mm, which is the maximum width of the possible exhaust valve. However, if the width of the opening is smaller than 30 mm, the lower surface of the rubber packing is wet with the electrolyte, and the electrostatic voltage is 16 kV. In this case, it is considered that the discharge path is not formed even if the distance from the opening to the exhaust hole is 14 mm or less. However, since the formation of such a discharge path may cause variations in electrostatic voltage depending on the usage environment of the lead storage battery 1, the distance should be at least 14 mm, and preferably about 20 mm if possible.
Next, the lead storage battery shown in FIGS. 2A and 2B is provided with a protrusion 7 having a width of 30 mm and a length of 3 mm on a part of the sheet 10 with respect to the lead storage battery of FIG. The protrusion 7 is filled with an electrolyte holding body 9 for holding the electrolyte, and the inside of the protrusion 7 comes to a position 5 mm from the exhaust hole in the path 4 formed by sticking the sheet 10. It is characterized by doing so. In addition, this lead acid battery is a liquid type (open type) provided with a liquid spout instead of the exhaust valve of FIG.
3 (a) and 3 (b) is the same liquid type lead acid battery as in FIG. 2, and a recess 8 having a width of 30 mm and a length of 3 mm is provided in a part of the battery case lid 3. The recess 8 is filled with an electrolyte holder 9 for holding the electrolyte, and the inside of the recess 8 is positioned 5 mm from the exhaust hole in the path 4 formed by sticking the sheet 10. It is characterized by that.

上記した各鉛蓄電池について、図１の実施の形態とは、排気弁を液口栓に変更した以外は同じ条件の試験に供し、結果を図５に示す。なお、結果は図２の鉛蓄電池も図３の鉛蓄電池も同じであった。   About each lead acid battery mentioned above, it uses for the test of the same conditions as embodiment of FIG. 1 except having changed the exhaust valve into the liquid stopper, and a result is shown in FIG. The results were the same for the lead storage battery of FIG. 2 and the lead storage battery of FIG.

図５から、電解液保持体に電解液を含浸させ、液口栓のゴムパッキン下面が電解液で濡れているものは、開口から電解液保持体までの距離を１ｍｍとした場合、静電気電圧が３．５ｋＶで前述した放電路が形成されたのに対し、電解液を含浸させず、液口栓のゴムパッキン下面が電解液で濡れていないものは、静電気電圧が１６ｋＶになるまで放電路は形成されなかった。また、静電気電圧が１６ｋＶの場合、開口から電解液保持体までの距離が１４ｍｍ以下であると前述した放電路が形成されることがわかった。また、この試験に供した鉛蓄電池と同材質（ＰＰ樹脂）の電槽および電槽蓋からなる鉛蓄電池を、手に持ったポリカーボネ−トで擦りつけて帯電量を１０回測定したところ、最低値が−２ｋＶ、最高値が−１６ｋＶであった。このことから、上記した１６ｋＶの静電気電圧で前述した放電路が形成されない距離、すなわち、開口から電解液保持体までの距離が１４ｍｍを超えるようにすることで、前述した放電路の形成が防止できる、と言える。ここでも、開口の幅を、考えられる排気弁の最大幅の３０ｍｍにしているが、前述した如く、開口の幅が３０ｍｍより小さくなると、ゴムパッキン下面が電解液で濡れていて、静電気電圧が１６ｋＶの場合で、開口から排気孔までの距離が１４ｍｍ以下でも、放電路が形成されないことが考えられる。しかしながら、このような放電路の形成は鉛蓄電池１の使用環境によって静電気電圧のバラツキが考えられるため、距離は少なくとも１４ｍｍを超えるようにし、可能であれば２０ｍｍ程度にするのが好ましい。   From FIG. 5, when the electrolytic solution holder is impregnated with the electrolytic solution and the bottom surface of the rubber packing of the liquid stopper is wetted with the electrolytic solution, when the distance from the opening to the electrolytic solution holder is 1 mm, the electrostatic voltage is Whereas the discharge path described above was formed at 3.5 kV, the discharge path was not impregnated until the electrostatic voltage reached 16 kV when the electrolyte packing was not impregnated and the bottom surface of the rubber plug of the liquid stopper was not wet with the electrolyte. Not formed. Further, it was found that when the electrostatic voltage is 16 kV, the above-described discharge path is formed when the distance from the opening to the electrolyte solution holder is 14 mm or less. In addition, when the lead storage battery made of the same material (PP resin) as the lead storage battery used in this test and the battery cover was rubbed with a polycarbonate in the hand and the charge amount was measured 10 times, The value was −2 kV and the maximum value was −16 kV. From this, the above-mentioned discharge path can be prevented from being formed by making the distance at which the above-mentioned discharge path is not formed by the above-described electrostatic voltage of 16 kV, that is, the distance from the opening to the electrolytic solution holder exceeds 14 mm. It can be said. Here, the width of the opening is set to 30 mm, which is the maximum possible exhaust valve width. However, as described above, when the width of the opening is smaller than 30 mm, the lower surface of the rubber packing is wet with the electrolyte, and the electrostatic voltage is 16 kV. In this case, it is considered that the discharge path is not formed even if the distance from the opening to the exhaust hole is 14 mm or less. However, since the formation of such a discharge path may cause variations in electrostatic voltage depending on the usage environment of the lead storage battery 1, the distance should be at least 14 mm, and preferably about 20 mm if possible.

なお、上記した電解液保持体９としては、電解液の吸収保持性能がすぐれた微細ガラスマットなどがよい。   In addition, as the above-described electrolytic solution holding body 9, a fine glass mat or the like having excellent absorption holding performance of the electrolytic solution is preferable.

また、上記したシート１０としては、材質が電槽の材質と同等あるいは絶縁性が電槽の材質と同程度の、ポリエチレン系のもの、ポリプロピレン系のもの、ポリエステル系のもの、ポリカーボネート系のもの、シリコンゴムなどのゴム系のもの、あるいはマイカテープのようなものがよく、これらを、それぞれの材質に適合した接着剤で貼着するのがよいが、シート以外に前述した材質の薄板も使用できる。   In addition, as the above-described sheet 10, the material is the same as the material of the battery case or the insulation is the same as the material of the battery case, a polyethylene type, a polypropylene type, a polyester type, a polycarbonate type, A rubber-based material such as silicon rubber or a material such as mica tape is good, and it is better to attach them with an adhesive suitable for each material. However, besides the sheet, a thin plate of the above-mentioned material can also be used. .

本発明は、排気孔から電解液の溢出のない密閉形鉛蓄電池を図１で想定し、排気孔から電解液の溢出のある開放形鉛蓄電池を図２、３で想定し、いずれの場合にも効果があることがわかった。   In the present invention, a sealed lead-acid battery with no electrolyte overflow from the exhaust hole is assumed in FIG. 1, and an open-type lead acid battery with electrolyte overflow from the exhaust hole is assumed in FIGS. Also found to be effective.

本発明によれば、鉛蓄電池が帯電した状態においても、その点検、交換、清掃、運搬に伴う静電気電圧による放電路が形成されないので、このような作業時の作業性の向上に寄与することができる。   According to the present invention, even when the lead storage battery is charged, a discharge path due to electrostatic voltage associated with inspection, replacement, cleaning, and transportation is not formed, which contributes to improvement in workability during such work. it can.

本発明の実施の形態に係る鉛蓄電池の全体図（ａ）と要部斜視図（ｂ）である。BRIEF DESCRIPTION OF THE DRAWINGS It is the whole figure (a) and principal part perspective view (b) of the lead storage battery which concerns on embodiment of this invention. 経路に突出部を設けた実施の形態に係る鉛蓄電池の全体図（ａ）と要部斜視図（ｂ）である。It is the whole figure (a) and principal part perspective view (b) of the lead acid battery which concern on embodiment which provided the protrusion part in the path | route. 経路に凹部を設けた実施の形態に係る鉛蓄電池の全体図（ａ）と要部斜視図（ｂ）である。It is the general view (a) and principal part perspective view (b) of the lead storage battery which concerns on embodiment which provided the recessed part in the path | route. 図１の鉛蓄電池について、静電気電圧と放電路が形成される距離との関係を示した図である。It is the figure which showed the relationship between an electrostatic voltage and the distance in which a discharge path is formed about the lead acid battery of FIG. 図２、図３の鉛蓄電池について、静電気電圧と放電路が形成される距離との関係を示した図である。It is the figure which showed the relationship between the electrostatic voltage and the distance in which a discharge path is formed about the lead acid battery of FIG. 2, FIG.

符号の説明Explanation of symbols

１ 鉛蓄電池
２ 電槽
３ 電槽蓋
４ 経路
５ 開口
６ 排気孔
７ 突出部
８ 凹部
９ 電解液保持体
１０ シート DESCRIPTION OF SYMBOLS 1 Lead acid battery 2 Battery case 3 Battery case cover 4 Path | route 5 Opening 6 Exhaust hole 7 Protruding part 8 Recessed part 9 Electrolyte holding body 10 Sheet

Claims (5)

各セルに対応した排気孔を電槽蓋に設け、前記電槽蓋の上面に、排気孔全体を覆うシートが、その周縁の一部に断面積が実質的にゼロである開口を形成して、前記排気孔からの排気のための経路を形成するように貼着され、電槽または電槽蓋の帯電時に開口から排気孔に至る放電路が形成されないようにしたことを特徴とする鉛蓄電池。 An exhaust hole corresponding to each cell is provided in the battery case lid, and a sheet covering the entire exhaust hole is formed on the upper surface of the battery case cover, and an opening having a substantially zero cross-sectional area is formed on a part of the periphery thereof. the lead-acid battery, characterized in that said is adhered to form a path for exhaust from the exhaust hole, a discharge path to the exhaust hole from the opening during charging of the container or the container lid is prevented from being formed . 請求項１記載の鉛蓄電池において、排気のための経路の長さを少なくとも１４ｍｍを超えるようにしたことを特徴とする鉛蓄電池。   2. The lead acid battery according to claim 1, wherein the length of the exhaust path exceeds at least 14 mm. 請求項１記載の鉛蓄電池において、シートは、一部に電解液を保持するための電解液保持体が充填された突出部を有し、この突出部が前記シートの貼着によって形成される経路に位置していることを特徴とする鉛蓄電池。   2. The lead-acid battery according to claim 1, wherein the sheet has a protruding portion partially filled with an electrolytic solution holding body for holding an electrolytic solution, and the protruding portion is formed by sticking the sheet. Lead acid battery characterized in that it is located in. 請求項１記載の鉛蓄電池において、電槽蓋は、一部に電解液を保持するための電解液保持体が充填された凹部を有し、この凹部がシートの貼着によって形成される経路に位置していることを特徴とする鉛蓄電池。   2. The lead-acid battery according to claim 1, wherein the battery case lid has a concave portion partially filled with an electrolytic solution holding body for holding the electrolytic solution, and the concave portion is formed in a path formed by sticking the sheet. Lead acid battery characterized by being located. 請求項３または４記載の鉛蓄電池において、突出部または凹部から開口までの経路の長さを少なくとも１４ｍｍを超えるようにしたことを特徴とする鉛蓄電池。
5. The lead acid battery according to claim 3, wherein the length of the path from the projecting part or the concave part to the opening exceeds at least 14 mm.
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