JPWO2015128917A1 - Lead acid battery - Google Patents

Lead acid battery Download PDF

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JPWO2015128917A1
JPWO2015128917A1 JP2015504783A JP2015504783A JPWO2015128917A1 JP WO2015128917 A1 JPWO2015128917 A1 JP WO2015128917A1 JP 2015504783 A JP2015504783 A JP 2015504783A JP 2015504783 A JP2015504783 A JP 2015504783A JP WO2015128917 A1 JPWO2015128917 A1 JP WO2015128917A1
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pair
side surfaces
electrode
battery case
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JP5824632B1 (en
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藤森　智貴
智貴 藤森
朝州 新城
朝州 新城
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Panasonic Intellectual Property Management Co Ltd
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    • 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
    • H01M10/06—Lead-acid accumulators
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • 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

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

鉛蓄電池は、極板群と、電解液と、極板群と電解液とを収納する樹脂製の電槽とを有する。電槽は、正極、負極の平面と対向する第１側面と、正極、負極の側辺と対向する第２側面と、底面とを有する。第１側面と第２側面とが接して形成された辺部の厚さの最小値をｔ１、第１側面のうち辺部に隣接する部位の厚さをｔ２、第２側面のうち辺部に隣接する部位の厚さをｔ３とすると、ｔ１／ｔ２が１．００以上、１．３２以下、ｔ１／ｔ３が１．０４以上、１．３８以下、かつｔ２／ｔ３が０．８９以上、１．２１以下である。The lead storage battery includes an electrode plate group, an electrolytic solution, and a resin battery case that houses the electrode plate group and the electrolyte solution. The battery case has a first side surface facing the flat surfaces of the positive electrode and the negative electrode, a second side surface facing the side edges of the positive electrode and the negative electrode, and a bottom surface. The minimum value of the thickness of the side portion formed by contacting the first side surface and the second side surface is t1, the thickness of the portion adjacent to the side portion of the first side surface is t2, and the side portion of the second side surface is the side portion. When the thickness of the adjacent part is t3, t1 / t2 is 1.00 or more and 1.32 or less, t1 / t3 is 1.04 or more and 1.38 or less, and t2 / t3 is 0.89 or more, 1 .21 or less.

Description

本発明は、主にエンジン始動用の開放型鉛蓄電池に関する。   The present invention mainly relates to an open type lead-acid battery for starting an engine.

鉛蓄電池の電槽は、外部からの応力だけではなく、鉛蓄電池内部からの応力に対しても、高い耐性が要求される。例えば、正極で発生する酸素ガスを負極で吸収する密閉式の鉛蓄電池（ＶＲＬＡ）では、内部が大気圧より低い減圧状態と大気圧より高い加圧状態とが繰り返される。このような場合でも、電槽が凹んだり膨らんだりすることを極力抑える必要がある。そのため、電槽の側面の少なくとも一辺に沿った部分を他の部分よりも厚くする構成が、例えば、特許文献１に紹介されている。   The battery case of the lead storage battery is required to have high resistance not only to external stress but also to stress from the inside of the lead storage battery. For example, in a sealed lead-acid battery (VRLA) in which oxygen gas generated at the positive electrode is absorbed by the negative electrode, a reduced pressure state lower than atmospheric pressure and a pressurized state higher than atmospheric pressure are repeated. Even in such a case, it is necessary to suppress as much as possible that the battery case is recessed or swollen. Therefore, for example, Patent Document 1 introduces a configuration in which a portion along at least one side of the side surface of the battery case is made thicker than other portions.

特開昭６２−０９３８５４号公報Japanese Unexamined Patent Publication No. 62-093854

本発明は、充電深さ（ＳＯＣ）が低い状態で比較的低温（０〜１０℃）と顕著な低温（−４０〜−３０℃）に交互に晒しても（以降、「低温サイクル」と称する）、電槽が亀裂等を起こして破損することがない、信頼性の高い鉛蓄電池を供給する。本発明に係る鉛蓄電池は、極板群と、電解液と、樹脂製の電槽とを有する。極板群は、それぞれに平面と側辺とを有する平板状の正極と負極と、これらの正極と負極との間に介在するセパレータとを有する。電解液は極板群を浸漬している。電槽は極板群と電解液とを収納している。電槽は、正極または負極の平面と対向する一対の第１側面と、正極および負極の側辺と対向する一対の第２側面と、一対の第１側面と一対の第２側面とに繋がった底面とを有する。ここで、一対の第１側面の一方と一対の第２側面の一方とが接して形成された辺部の厚さの最小値をｔ１とし、一対の第１側面のそれぞれにおいて辺部に隣接する第１部位の厚さをｔ２とし、一対の第２側面のそれぞれにおいて辺部に隣接する第２部位の厚さをｔ３とする。この場合、ｔ１／ｔ２が１．００以上、１．３２以下、ｔ１／ｔ３が１．０４以上、１．３８以下、かつｔ２／ｔ３が０．８９以上、１．２１以下である。   The present invention is alternately exposed to a relatively low temperature (0 to 10 ° C.) and a remarkable low temperature (−40 to −30 ° C.) in a state where the charging depth (SOC) is low (hereinafter referred to as “low temperature cycle”). ), To provide a highly reliable lead-acid battery that does not break the battery case due to cracks. The lead acid battery according to the present invention includes an electrode plate group, an electrolytic solution, and a resin battery case. The electrode plate group includes a flat plate-like positive electrode and a negative electrode each having a flat surface and a side, and a separator interposed between the positive electrode and the negative electrode. The electrolytic solution immerses the electrode plate group. The battery case houses the electrode plate group and the electrolyte. The battery case was connected to a pair of first side surfaces facing the plane of the positive electrode or the negative electrode, a pair of second side surfaces facing the sides of the positive electrode and the negative electrode, a pair of first side surfaces, and a pair of second side surfaces. And a bottom surface. Here, the minimum value of the thickness of the side portion formed by contacting one of the pair of first side surfaces and one of the pair of second side surfaces is defined as t1, and adjacent to the side portion in each of the pair of first side surfaces. The thickness of the first part is t2, and the thickness of the second part adjacent to the side part in each of the pair of second side surfaces is t3. In this case, t1 / t2 is 1.00 or more and 1.32 or less, t1 / t3 is 1.04 or more and 1.38 or less, and t2 / t3 is 0.89 or more and 1.21 or less.

この構成では、ＳＯＣが低い状態で低温に長時間晒しても、電槽が亀裂等を起こして破損することがない。そのため鉛蓄電池の信頼性を高めることができる。   In this structure, even if it exposes to low temperature for a long time in the state where SOC is low, a battery case does not raise | generate a crack etc. and will not be damaged. Therefore, the reliability of the lead storage battery can be increased.

本発明の実施の形態における鉛蓄電池を模式的に示した一部切り欠き斜視図1 is a partially cutaway perspective view schematically showing a lead storage battery according to an embodiment of the present invention. 図１に示す鉛蓄電池の要部断面図Sectional drawing of the principal part of the lead acid battery shown in FIG. 本発明の実施の形態における他の鉛蓄電池の要部断面図Sectional drawing of the principal part of the other lead acid battery in embodiment of this invention 凍結破損の加速評価条件を示す図Diagram showing conditions for accelerated evaluation of freezing damage

本発明の実施の形態の説明に先立ち、従来の構成における課題を説明する。前述のように特許文献１はＶＲＬＡに関する。この特許文献１の開示内容に沿って、開放型の鉛蓄電池を補強しても極限条件で電槽は破損を伴う変形を起こすことがある。開放型の鉛蓄電池では、正極と負極とをセパレータを介して積層した極板群が豊富な電解液に浸漬されている。以下のこの種の鉛蓄電池を液式鉛蓄電池と称する。具体的には、ＳＯＣが低い液式鉛蓄電池を、低温サイクルに晒した場合、電槽の側面の一辺に沿った部分を中心に、亀裂が生じることがある。ＳＯＣが低い状態では、正極２の活物質も負極３の活物質も多くが硫酸鉛となるために、電解液の中の硫酸イオンの濃度が低下する。この状態では、モル凝固点降下が小さくなる。そのため電解液が凍結し、液体状態よりも電解液の体積が増す。その結果、電槽６が部分的に圧迫されて亀裂等の破損が誘発される。以降、この現象を「凍結破損」と称する。   Prior to the description of the embodiments of the present invention, problems in the conventional configuration will be described. As described above, Patent Document 1 relates to VRLA. In accordance with the disclosure of Patent Document 1, even if an open type lead-acid battery is reinforced, the battery case may be deformed with breakage under extreme conditions. In an open type lead-acid battery, an electrode plate group in which a positive electrode and a negative electrode are laminated via a separator is immersed in an abundant electrolyte. This type of lead acid battery is referred to as a liquid lead acid battery. Specifically, when a liquid lead-acid battery having a low SOC is exposed to a low-temperature cycle, cracks may occur around a portion along one side of the battery case. In a state where the SOC is low, the active material of the positive electrode 2 and the active material of the negative electrode 3 are both lead sulfate, so that the concentration of sulfate ions in the electrolytic solution decreases. In this state, the molar freezing point depression is reduced. Therefore, the electrolytic solution is frozen and the volume of the electrolytic solution is increased as compared with the liquid state. As a result, the battery case 6 is partially compressed and breakage such as cracks is induced. Hereinafter, this phenomenon is referred to as “freezing damage”.

以下、図面を参照しながら、本発明の実施の形態について詳細に説明する。図１は、本発明の実施の形態における鉛蓄電池１を模式的に示した一部切り欠き斜視図である。図２は鉛蓄電池１の要部断面図である。鉛蓄電池１は、極板群５と樹脂製の電槽６と図示しない電解液とを有する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway perspective view schematically showing a lead storage battery 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the main part of the lead storage battery 1. The lead storage battery 1 includes an electrode plate group 5, a resin battery case 6, and an electrolyte solution (not shown).

極板群５は複数の正極２と、複数の負極３と、各正極２と各負極３との間に介在するセパレータ４とを有する。すなわち、極板群５は複数の正極２と複数の負極３とがセパレータ４を介して積層されて構成されている。図２に示すように、正極２は平板状であり、平面２Ａと側辺２Ｂとを有する。負極３も平板状であり、平面３Ａと側辺３Ｂとを有する。   The electrode plate group 5 includes a plurality of positive electrodes 2, a plurality of negative electrodes 3, and a separator 4 interposed between each positive electrode 2 and each negative electrode 3. That is, the electrode plate group 5 is configured by laminating a plurality of positive electrodes 2 and a plurality of negative electrodes 3 via separators 4. As shown in FIG. 2, the positive electrode 2 has a flat plate shape, and has a flat surface 2A and a side 2B. The negative electrode 3 is also flat and has a flat surface 3A and side 3B.

極板群５は、電解液と共に、電槽６の中で区切られたセル室６ａに収容されている。すなわち、電解液は極板群５を浸漬している。電槽６は極板群５と電解液とを収納している。   The electrode plate group 5 is housed in a cell chamber 6 a separated in the battery case 6 together with the electrolytic solution. That is, the electrolytic solution immerses the electrode plate group 5. The battery case 6 stores the electrode plate group 5 and the electrolytic solution.

正極２は、集電体である正極格子と、正極格子に充填された正極活物質とを有する。負極３は、集電体である負極格子と、負極格子に充填された負極活物質とを有する。   The positive electrode 2 has a positive electrode grid that is a current collector and a positive electrode active material filled in the positive electrode grid. The negative electrode 3 has a negative electrode grid that is a current collector and a negative electrode active material filled in the negative electrode grid.

図１に示すように、正極格子の耳部９同士が正極ストラップ７によって結合されている。これにより複数の正極２は互いに並列接続されている。同様に、負極格子の耳部１０同士が負極ストラップ８によって結合されている。これにより複数の負極３は互いに並列接続されている。   As shown in FIG. 1, the lugs 9 of the positive grid are connected by a positive strap 7. Thereby, the some positive electrode 2 is mutually connected in parallel. Similarly, the ears 10 of the negative grid are connected by a negative strap 8. Thereby, the some negative electrode 3 is mutually connected in parallel.

さらに、各セル室６ａ内に収容された複数の極板群５は、接続体１１によって直列接続されている。両端のセル室６ａにおける正極ストラップ７及び負極ストラップ８には、それぞれ極柱（図示せず）が溶接されており、各極柱は、蓋１４に配設された正極端子１２及び負極端子１３に、それぞれ溶接されている。   Further, the plurality of electrode plate groups 5 accommodated in each cell chamber 6 a are connected in series by a connecting body 11. Polar columns (not shown) are welded to the positive strap 7 and the negative strap 8 in the cell chambers 6a at both ends, respectively, and the polar columns are respectively connected to the positive terminal 12 and the negative terminal 13 disposed on the lid 14. , Each is welded.

電槽６は、例えばポリプロピレンなどのポリオレフィン系の樹脂製であり、一対の第１側面６ｂと、一対の第２側面６ｃと、底面（図示せず）とを有する。第１側面６ｂは、正極２の平面２Ａまたは負極３の平面３Ａと対向している。第２側面６ｃは、正極２の側辺２Ｂおよび負極３の側辺３Ｂと対向している。底面は一対の第１側面６ｂと一対の第２側面６ｃとに繋がっている。そして第１側面６ｂと第２側面６ｃとは、辺部６ｄにて接している。   The battery case 6 is made of, for example, a polyolefin-based resin such as polypropylene, and has a pair of first side surfaces 6b, a pair of second side surfaces 6c, and a bottom surface (not shown). The first side surface 6b faces the flat surface 2A of the positive electrode 2 or the flat surface 3A of the negative electrode 3. The second side surface 6 c faces the side 2 </ b> B of the positive electrode 2 and the side 3 </ b> B of the negative electrode 3. The bottom surface is connected to the pair of first side surfaces 6b and the pair of second side surfaces 6c. The first side surface 6b and the second side surface 6c are in contact with each other at the side portion 6d.

図２は、電槽６の底面と平行に、極板群５の高さ方向の中心部を切断したときの、辺部６ｄの周辺を示している。一対の第１側面６ｂの一方と一対の第２側面６ｃの一方とが接して形成された辺部６ｄの厚さの最小値をｔ１とし、一対の第１側面６ｂのそれぞれにおいて辺部６ｄに隣接する第１部位６０ｂの厚さをｔ２とし、一対の第２側面６ｃのそれぞれにおいて辺部６ｄに隣接する第２部位６０ｃの厚さをｔ３とする。この場合、ｔ１／ｔ２が１．００以上、１．３２以下、ｔ１／ｔ３が１．０４以上、１．３８以下、かつｔ２／ｔ３が０．８９以上、１．２１以下である。   FIG. 2 shows the periphery of the side portion 6 d when the center portion in the height direction of the electrode plate group 5 is cut parallel to the bottom surface of the battery case 6. The minimum value of the thickness of the side portion 6d formed by contacting one of the pair of first side surfaces 6b and one of the pair of second side surfaces 6c is defined as t1, and the side portion 6d of each of the pair of first side surfaces 6b The thickness of the adjacent first part 60b is t2, and the thickness of the second part 60c adjacent to the side part 6d in each of the pair of second side surfaces 6c is t3. In this case, t1 / t2 is 1.00 or more and 1.32 or less, t1 / t3 is 1.04 or more and 1.38 or less, and t2 / t3 is 0.89 or more and 1.21 or less.

特許文献１では、電槽６における極板群５の反応面と接する部分である第１側面６ｂの上に厚い部分を設ける方法が提示されている。そしてこの方法によって、極板群５から第１側面６ｂに掛かる応力を緩和できる旨が記載されている。しかし、液式鉛蓄電池の凍結破損に対しては、特許文献１の構成を適用しても効果がない。また凍結破損は低温サイクルに晒すと促進される。   In patent document 1, the method of providing a thick part on the 1st side surface 6b which is a part which contact | connects the reaction surface of the electrode group 5 in the battery case 6 is proposed. And it is described that the stress applied from the electrode plate group 5 to the first side face 6b can be relieved by this method. However, even if the structure of patent document 1 is applied to the freezing damage of the liquid lead-acid battery, there is no effect. Freezing breakage is also promoted when exposed to low temperature cycles.

凍結破損は電槽６の辺部６ｄの近傍で発生しやすい。そのため、辺部６ｄの近傍における電槽６の厚みの比を最適化することで、電解液が凍結により膨張しても、特定の部位のみに応力が集中しなくなる。この最適化条件が、ｔ１／ｔ２が１．００以上、１．３２以下、ｔ１／ｔ３が１．０４以上、１．３８以下、かつｔ２／ｔ３が０．８９以上、１．２１以下である。   Freezing damage is likely to occur near the side 6d of the battery case 6. Therefore, by optimizing the ratio of the thickness of the battery case 6 in the vicinity of the side portion 6d, even if the electrolytic solution expands due to freezing, stress does not concentrate only on a specific part. The optimization conditions are t1 / t2 of 1.00 or more and 1.32 or less, t1 / t3 of 1.04 or more and 1.38 or less, and t2 / t3 of 0.89 or more and 1.21 or less. .

ｔ１／ｔ２が１．００未満の場合、応力が集中している辺部６ｄが相対的に薄すぎるために、辺部６ｄに亀裂が生じやすい。一方、ｔ１／ｔ２が１．３２を超える場合、辺部６ｄが受けていた応力が過剰に緩和されるために、辺部６ｄとこれに隣接する第１側面６ｂとの境界に亀裂が生じやすい。   When t1 / t2 is less than 1.00, the side 6d where the stress is concentrated is relatively thin, so that the side 6d is likely to crack. On the other hand, when t1 / t2 exceeds 1.32, the stress applied to the side portion 6d is excessively relaxed, so that a crack is likely to occur at the boundary between the side portion 6d and the first side surface 6b adjacent thereto. .

ｔ１／ｔ３が１．０４未満の場合、応力が集中している辺部６ｄが相対的に薄すぎるために、辺部６ｄに亀裂が生じやすい。一方、ｔ１／ｔ３が１．３８を超える場合、辺部６ｄが受けていた応力が過剰に緩和されるために、辺部６ｄとこれに隣接する第２側面６ｃとの境界に亀裂が生じやすい。   When t1 / t3 is less than 1.04, the side portion 6d where the stress is concentrated is relatively too thin, and the side portion 6d is likely to crack. On the other hand, when t1 / t3 exceeds 1.38, the stress received by the side portion 6d is excessively relieved, so that a crack is likely to occur at the boundary between the side portion 6d and the second side surface 6c adjacent thereto. .

ｔ２／ｔ３が０．８９未満の場合、第１側面６ｂのうち辺部６ｄに隣接する第１部位６０ｂが広範囲に亘って応力を受けることになる。その結果、辺部６ｄとこれに隣接する第１側面６ｂとの境界に亀裂が生じやすい。一方、ｔ２／ｔ３が１．２１を超える場合、第１側面６ｂのうち辺部６ｄに隣接する第１部位６０ｂの変形が過剰に少なくなるため、辺部６ｄとこれに隣接する第２側面６ｃとの境界に亀裂が生じやすくなる。   When t2 / t3 is less than 0.89, the 1st site | part 60b adjacent to the edge part 6d among the 1st side surfaces 6b receives a stress over a wide range. As a result, a crack is likely to occur at the boundary between the side portion 6d and the first side surface 6b adjacent thereto. On the other hand, when t2 / t3 exceeds 1.21, the deformation of the first portion 60b adjacent to the side portion 6d of the first side surface 6b is excessively reduced, and therefore the side portion 6d and the second side surface 6c adjacent to the side portion 6d. Cracks are likely to occur at the boundary.

すなわち、ｔ１／ｔ２、ｔ１／ｔ３およびｔ２／ｔ３の全てが好適範囲を満たす場合のみ、電解液が凍結して膨張しても特定の部位のみに応力が集中せず、凍結破損を免れる。   That is, only when all of t1 / t2, t1 / t3, and t2 / t3 satisfy the preferred range, even if the electrolyte freezes and expands, stress is not concentrated only on a specific portion, and freezing damage is avoided.

図２では、第１側面６ｂのうち辺部６ｄに隣接する第１部位６０ｂに、第１リブ１５ａが設けられ、第２側面６ｃのうち辺部６ｄに隣接する第２部位６０ｃに第２リブ１５ｂが設けられている。第１リブ１５ａは底面から第１側面６ｂが伸びる方向（すなわち上方）に沿って伸び、第１側面６ｂから外側に向かって略垂直に設けられている。第２リブ１５ｂは底面から第２側面６ｃが伸びる方向（すなわち上方）に沿って伸び、第２側面６ｃから外側に向かって略垂直に設けられている。この構成により、応力が集中するポイントが複数となり、応力がより分散される。このように、第１部位６０ｂに第１リブ１５ａを設け、第２部位６０ｃに第２リブ１５ｂを設けることが好ましい。なお第１リブ１５ａおよび第２リブ１５ｂの高さは、それぞれ第１側面６ｂおよび第２側面６ｃの厚さの０．５倍以上、２．０倍以下とするのが好ましい。   In FIG. 2, the 1st rib 15a is provided in the 1st site | part 60b adjacent to the edge part 6d among the 1st side surfaces 6b, and the 2nd rib is provided in the 2nd site | part 60c adjacent to the edge part 6d among the 2nd side surfaces 6c. 15b is provided. The first ribs 15a extend along the direction in which the first side surface 6b extends from the bottom surface (that is, upward), and are provided substantially perpendicularly from the first side surface 6b to the outside. The second rib 15b extends from the bottom surface along the direction in which the second side surface 6c extends (ie, upward), and is provided substantially perpendicularly from the second side surface 6c to the outside. With this configuration, there are a plurality of points on which stress is concentrated, and the stress is further dispersed. Thus, it is preferable to provide the 1st rib 15a in the 1st site | part 60b, and to provide the 2nd rib 15b in the 2nd site | part 60c. In addition, it is preferable that the height of the 1st rib 15a and the 2nd rib 15b shall be 0.5 times or more and 2.0 times or less of the thickness of the 1st side surface 6b and the 2nd side surface 6c, respectively.

なお図２では第１リブ１５ａおよび第２リブ１５ｂはそれぞれ複数設けられている。しかしながら、第１リブ１５ａおよび第２リブ１５ｂはそれぞれ１つでもよい。すなわち、図３の要部断面図に示すように、第１リブ１５ａおよび第２リブ１５ｂはそれぞれ単一であっても良い。   In FIG. 2, a plurality of first ribs 15a and second ribs 15b are provided. However, each of the first rib 15a and the second rib 15b may be one. That is, as shown in the cross-sectional view of the main part in FIG. 3, each of the first rib 15a and the second rib 15b may be single.

なお図２、図３に示す、底面に平行な辺部６ｄの断面において、辺部６ｄの内側の部分の曲率半径（以下、Ｒと称す）は１．７ｍｍ以上であることが好ましい。Ｒが１．７ｍｍ以上あれば、応力がより分散される。   In the cross section of the side portion 6d parallel to the bottom surface shown in FIGS. 2 and 3, the radius of curvature (hereinafter referred to as R) of the portion inside the side portion 6d is preferably 1.7 mm or more. If R is 1.7 mm or more, the stress is more dispersed.

「辺部６ｄの厚さの最小値ｔ１」とは、図２に示すように、第１側面６ｂと第２側面６ｃとが接するコーナーから最短で電槽６の外面に到達するまでの距離に相当する。   As shown in FIG. 2, the “minimum value t1 of the side portion 6d” is the distance from the corner where the first side surface 6b and the second side surface 6c are in contact to the outer surface of the battery case 6 in the shortest distance. Equivalent to.

「第１側面６ｂのうち辺部６ｄに隣接する第１部位６０ｂの厚さｔ２」とは、第１リブ１５ａの高さを含まない。また「第２側面６ｃのうち辺部６ｄに隣接する第２部位６０ｃの厚さｔ３」とは、第２リブ１５ｂの高さを含まない。   The “thickness t2 of the first portion 60b adjacent to the side portion 6d in the first side surface 6b” does not include the height of the first rib 15a. The “thickness t3 of the second portion 60c adjacent to the side portion 6d of the second side surface 6c” does not include the height of the second rib 15b.

また図２、図３では、第１側面６ｂや第２側面６ｃの厚さが、辺部６ｄから遠ざかった部位において小さくなっている。しかしながら、第１側面６ｂおよび第２側面６ｃの厚さが、辺部６ｄから遠ざかった部位と辺部６ｄに隣接する部位とで同じでも、同様の効果を奏する。   In FIGS. 2 and 3, the thickness of the first side surface 6 b and the second side surface 6 c is small at a portion away from the side portion 6 d. However, even if the thickness of the first side surface 6b and the second side surface 6c is the same in the part far from the side part 6d and the part adjacent to the side part 6d, the same effect is produced.

以下、具体的な例を挙げて、本実施の形態による構成及び効果を説明する。なお、本発明は、これらの例に限定されるものではない。   Hereinafter, the configuration and effects according to the present embodiment will be described with specific examples. The present invention is not limited to these examples.

（１）鉛蓄電池のサンプルの作製
本例における鉛蓄電池１は、ＪＩＳＤ５３０１に規定されたＤ２３Ｌタイプの大きさを有する。すなわち、鉛蓄電池１の幅は１７３ｍｍ、高さは２０４ｍｍ、長さは２３０ｍｍであり、正極端子１２と鉛蓄電池１の短辺（幅方向）とが手前に来るように置いた時、正極端子１２が左側に寄っている。また極板群５の上端は電解液に浸っている。セル室６ａにはそれぞれ、７枚の正極２と８枚の負極３とが収容されている。負極３はそれぞれ、袋状のポリエチレン製のセパレータ４に収容されている。(1) Preparation of lead acid battery sample The lead acid battery 1 in this example has a size of the D23L type defined in JIS D5301. That is, the lead-acid battery 1 has a width of 173 mm, a height of 204 mm, and a length of 230 mm. When the positive-electrode terminal 12 and the short side (width direction) of the lead-acid battery 1 are placed in front, the positive-electrode terminal 12 Is on the left. Further, the upper end of the electrode plate group 5 is immersed in the electrolytic solution. Each of the cell chambers 6a accommodates seven positive electrodes 2 and eight negative electrodes 3. Each of the negative electrodes 3 is accommodated in a bag-like polyethylene separator 4.

正極２は、酸化鉛粉と硫酸と精製水とを混練して調製されたペーストをカルシウム系鉛合金のエキスパンドメタルで形成された正極格子に充填することで作製されている。   The positive electrode 2 is manufactured by filling a paste prepared by kneading lead oxide powder, sulfuric acid, and purified water into a positive electrode lattice formed of an expanded metal of a calcium-based lead alloy.

負極３は、酸化鉛粉に有機添加剤等を添加した混合物と、硫酸と精製水とを混練して調製されたペーストをカルシウム系鉛合金のエキスパンドメタルで形成された負極格子に充填することで作製されている。   The negative electrode 3 is obtained by filling a paste prepared by kneading a mixture obtained by adding an organic additive or the like to lead oxide powder and sulfuric acid and purified water into a negative electrode lattice formed of an expanded metal of a calcium-based lead alloy. Have been made.

上述のようにして作製された正極２及び負極３を熟成乾燥した後、負極３をポリエチレンの袋状のセパレータ４に収容し、正極２と交互に重ね、７枚の正極２と８枚の負極３とがセパレータ４を介して積層する。次いで、正極格子の耳部９同士を正極ストラップ７によって結合し、正極２を互いに並列接続する。同様に、負極格子の耳部１０同士を負極ストラップ８によって結合し、負極３を互いに並列接続する。このようにして６つの極板群５を作製する。   After aging and drying the positive electrode 2 and the negative electrode 3 produced as described above, the negative electrode 3 is accommodated in a polyethylene bag-like separator 4 and alternately stacked with the positive electrode 2 to form seven positive electrodes 2 and eight negative electrodes. 3 and the separator 4 are stacked. Next, the ears 9 of the positive grid are joined together by the positive strap 7 and the positive poles 2 are connected in parallel to each other. Similarly, the ears 10 of the negative electrode lattice are connected to each other by the negative electrode strap 8, and the negative electrodes 3 are connected in parallel. In this way, six electrode plate groups 5 are produced.

そして電槽６内に設けられた６つのセル室６ａに極板群５をそれぞれ収容する。次いで、極板群５を接続体１１によって直列接続する。そして電槽６内に密度が１．２８ｇ／ｃｍ３の希硫酸である電解液を注入し、電槽６内で正極２、負極３の間に所定の電圧を印加して正極２、負極３を化成（部分充電）する（以下、電槽化成と称する）。このようにして、鉛蓄電池１が完成する。鉛蓄電池１では、極板群５の上端よりも電解液の液面の方が上部にある。And the electrode group 5 is accommodated in the six cell chambers 6a provided in the battery case 6, respectively. Next, the electrode plate group 5 is connected in series by the connection body 11. Then, an electrolytic solution of dilute sulfuric acid having a density of 1.28 g / cm 3 is injected into the battery case 6, and a predetermined voltage is applied between the positive electrode 2 and the negative electrode 3 in the battery case 6, so that the positive electrode 2, the negative electrode 3. Is formed (partially charged) (hereinafter referred to as battery case formation). In this way, the lead storage battery 1 is completed. In the lead storage battery 1, the liquid level of the electrolyte is higher than the upper end of the electrode plate group 5.

（２）電槽の構成
サンプルＡ〜Ｘの電槽では、第１側面６ｂのベースとなる、辺部６ｄから遠ざかった部位における厚さは２．０ｍｍで、第２側面６ｃのベースとなる、辺部６ｄから遠ざかった部位における厚さは２．０ｍｍである。そして、第１側面６ｂにおいて辺部６ｄに隣接する第１部位６０ｂとは、辺部６ｄから２５ｍｍ以内の部分である。また第２側面６ｃにおいて辺部６ｄに隣接する第２部位６０ｃとは、辺部６ｄから２５ｍｍ以内の部分である。サンプルＡ〜Ｘの電槽６では、（表１）に示すように、辺部６ｄの厚さの最小値ｔ１、第１部位６０ｂの厚さｔ２、第２部位６０ｃの厚さｔ３、辺部６ｄの内側のＲの値と組合せが異なる。(2) Structure of battery case In the battery cases of Samples A to X, the thickness of the part that is the base of the first side face 6b and is away from the side part 6d is 2.0 mm, and the base of the second side face 6c. The thickness at the part away from the side part 6d is 2.0 mm. And the 1st site | part 60b adjacent to the edge part 6d in the 1st side surface 6b is a part within 25 mm from the edge part 6d. Moreover, the 2nd site | part 60c adjacent to the edge part 6d in the 2nd side surface 6c is a part within 25 mm from the edge part 6d. In the battery case 6 of the samples A to X, as shown in (Table 1), the minimum value t1 of the side part 6d, the thickness t2 of the first part 60b, the thickness t3 of the second part 60c, and the side part The combination with the value of R inside 6d is different.

なおサンプルＹでは第１側面６ｂ、第２側面６ｃの厚さは均一であり、厚さｔ２、ｔ３はそれぞれ第１側面６ｂの厚さ、第２側面６ｃの厚さを示している。またサンプルＷ〜Ｙでは、辺部６ｄに隣接する第１部位６０ｂ、第２部位６０ｃから２ｍｍ略垂直に突出した第１リブ１５ａおよび第２リブ１５ｂを設けている。サンプルＷ、Ｙでは図２に示すように第１リブ１５ａおよび第２リブ１５ｂを第１部位６０ｂ、第２部位６０ｃあたりそれぞれ３個設け、サンプルＸでは図３に示すように第１リブ１５ａおよび第２リブ１５ｂを第１部位６０ｂ、第２部位６０ｃあたりそれぞれ１個設けている。   In sample Y, the thickness of the first side surface 6b and the second side surface 6c is uniform, and the thicknesses t2 and t3 indicate the thickness of the first side surface 6b and the thickness of the second side surface 6c, respectively. Further, in the samples W to Y, the first portion 60b adjacent to the side portion 6d and the first rib 15a and the second rib 15b protruding substantially 2 mm from the second portion 60c are provided. In the samples W and Y, three first ribs 15a and two second ribs 15b are provided for each of the first portion 60b and the second portion 60c as shown in FIG. 2, and in the sample X, the first rib 15a and the second rib 15b are provided as shown in FIG. One second rib 15b is provided for each of the first part 60b and the second part 60c.

（３）凍結破損の加速評価
電槽化成後の各サンプルを、２０時間率の電流で１０．５Ｖまで放電し、さらに４０℃の環境で１０Ｗのランプに接続する低率放電を１週間継続する。この後、環境温度を図４に示す条件にしたがって制御する。このような凍結破損が起こりやすい環境に各サンプルを晒す。図４に示す条件を２０サイクル繰り返した後、電槽６の各部位を目視で観察しつつ指先で触診する。(3) Accelerated evaluation of freezing breakage Each sample after battery case formation is discharged to 10.5 V at a current of 20 hours, and further low-rate discharge connected to a 10 W lamp in an environment of 40 ° C. is continued for 1 week. . Thereafter, the environmental temperature is controlled according to the conditions shown in FIG. Each sample is exposed to an environment where freezing damage is likely to occur. After repeating the conditions shown in FIG. 20 for 20 cycles, palpation is performed with a fingertip while visually observing each part of the battery case 6.

以上の評価の結果、目視上の変化がないサンプルには「ＥＸ」、変色は視認できたが触診上の変化はないサンプルには「Ｇ」、変色が視認でき触診上の変化（凹凸）も確認できたが凍結破損には至っていないサンプルには「ＯＫ」、凍結破損に至ったサンプルには「ＮＧ」をそれぞれ（表１）に示している。   As a result of the above evaluation, “EX” is obtained for the sample having no visual change, and “G” is applied to the sample that has been visually recognized but has no change in palpation. Table 1 shows “OK” for samples that have been confirmed but have not been frozen and damaged, and “NG” for samples that have been frozen and damaged.

Figure 2015128917
Figure 2015128917

まず、サンプルＡ〜Ｓについて対比して、ｔ１／ｔ２、ｔ１／ｔ３およびｔ２／ｔ３の範囲を検討する。（表１）に示すように、サンプルＡ、Ｇ、Ｈ、Ｍ、Ｎ、Ｓでは凍結破損が生じている。   First, in comparison with the samples A to S, the ranges of t1 / t2, t1 / t3, and t2 / t3 are examined. As shown in (Table 1), the samples A, G, H, M, N, and S are frozen and broken.

サンプルＡの電槽では、ｔ１／ｔ２が１．００未満でかつｔ１／ｔ３が１．０４未満である。サンプルＡでは、辺部６ｄに亀裂が生じている。   In the battery case of sample A, t1 / t2 is less than 1.00 and t1 / t3 is less than 1.04. In sample A, the side 6d is cracked.

サンプルＧの電槽では、ｔ１／ｔ２が１．３２を超えかつｔ１／ｔ３が１．３８を超えている。サンプルＧでは、辺部６ｄとこれに隣接する第１側面６ｂとの境界、および辺部６ｄとこれに隣接する第２側面６ｃとの境界に亀裂が生じている。   In the battery case of sample G, t1 / t2 exceeds 1.32 and t1 / t3 exceeds 1.38. In the sample G, cracks are generated at the boundary between the side portion 6d and the first side surface 6b adjacent thereto and at the boundary between the side portion 6d and the second side surface 6c adjacent thereto.

サンプルＨの電槽では、ｔ１／ｔ３が１．３８を超えかつｔ２／ｔ３が１．２１を超えている。サンプルＨでは、辺部６ｄとこれに隣接する第２側面６ｃとの境界に亀裂が生じている。   In the battery case of sample H, t1 / t3 exceeds 1.38 and t2 / t3 exceeds 1.21. In the sample H, a crack is generated at the boundary between the side portion 6d and the second side surface 6c adjacent thereto.

サンプルＭの電槽では、ｔ１／ｔ３が１．０４未満でかつｔ２／ｔ３が０．８９未満であるサンプルＭでは、辺部６ｄとこれに隣接する第１側面６ｂとの境界、および辺部６ｄに亀裂が生じている。   In the battery case of sample M, in sample M in which t1 / t3 is less than 1.04 and t2 / t3 is less than 0.89, the boundary between the side portion 6d and the first side surface 6b adjacent thereto, and the side portion There is a crack in 6d.

サンプルＮの電槽では、ｔ１／ｔ２が１．３２を超えかつｔ２／ｔ３が０．８９未満である。サンプルＮでは、辺部６ｄとこれに隣接する第１側面６ｂとの境界に亀裂が生じている。   In the battery case of sample N, t1 / t2 exceeds 1.32 and t2 / t3 is less than 0.89. In the sample N, a crack is generated at the boundary between the side portion 6d and the first side surface 6b adjacent thereto.

サンプルＳの電槽では、ｔ１／ｔ２が１．００未満でかつｔ２／ｔ３が１．２１を超えている。サンプルＳでは、辺部６ｄとこれに隣接する第２側面６ｃとの境界、および辺部６ｄに亀裂が生じている。   In the battery case of sample S, t1 / t2 is less than 1.00 and t2 / t3 is greater than 1.21. In the sample S, the boundary between the side portion 6d and the second side surface 6c adjacent thereto and the side portion 6d are cracked.

これらを除くサンプルＢ〜Ｆ、サンプルＩ〜ＬおよびサンプルＯ〜Ｒは、変色や触感上の凹凸があっても凍結破損は免れている。以上の結果から、ｔ１／ｔ２を１．００以上、１．３２以下、ｔ１／ｔ３を１．０４以上、１．３８以下、かつｔ２／ｔ３を０．８９以上、１．２１以下にすることにより凍結破損を防止することができることがわかる。   Samples B to F, samples I to L, and samples O to R other than these are free from freezing damage even if there are discoloration or tactile unevenness. From the above results, t1 / t2 should be 1.00 or more and 1.32 or less, t1 / t3 should be 1.04 or more and 1.38 or less, and t2 / t3 should be 0.89 or more and 1.21 or less. It can be seen that freezing breakage can be prevented.

次に、サンプルＴ〜ＶおよびサンプルＤについて対比して辺部６ｄの内側のＲについて検討する。Ｒが１．５ｍｍであるサンプルＴでは、応力の分散がやや不足したために、凍結破損は免れたものの、サンプルＤと比べて触感上の凹凸が観察されている。一方、Ｒが３．０ｍｍ以上であるサンプルＵ、Ｖでは、サンプルＤと比べて変色そのものが見られなくなっている。以上の結果から、辺部６ｄの内側のＲについては、１．７ｍｍ以上であることが好ましいことがわかる。なお、Ｒが３．８ｍｍであるサンプルＶでは、第１側面６ｂに隣接するセル室６ａの内容積が小さくなる。そのため、極板群５の挿入が困難になる。したがって、辺部６ｄの内側のＲは３．８ｍｍ未満であることがさらに好ましい。   Next, in contrast to the samples T to V and the sample D, the R inside the side portion 6d is examined. In the sample T in which R is 1.5 mm, since the dispersion of stress is slightly insufficient, freezing damage is avoided, but unevenness in tactile sensation is observed compared to the sample D. On the other hand, in the samples U and V in which R is 3.0 mm or more, the discoloration itself is not seen as compared with the sample D. From the above results, it can be seen that R inside the side portion 6d is preferably 1.7 mm or more. In the sample V in which R is 3.8 mm, the internal volume of the cell chamber 6a adjacent to the first side surface 6b is small. Therefore, it becomes difficult to insert the electrode plate group 5. Therefore, it is more preferable that R inside the side portion 6d is less than 3.8 mm.

次に、サンプルＷ、ＸおよびサンプルＤを対比して、第１リブ１５ａおよび第２リブ１５ｂの有無による影響を検討する。サンプルＷ、Ｘは第１リブ１５ａおよび第２リブ１５ｂを有する。そのため、サンプルＤと比較して、サンプルＷ、Ｘでは、応力の分散がさらに高まったことに起因して、凍結破損がより起こりにくくなっている。以上の結果から、第１側面６ｂのうち辺部６ｄに隣接する部位に、第１側面６ｂに略垂直な第１リブ１５ａを設け、第２側面６ｃのうち辺部６ｄに隣接する部位に、第２側面６ｃに略垂直な第２リブ１５ｂを設けることが好ましいことがわかる。   Next, the effects of the presence or absence of the first rib 15a and the second rib 15b are examined by comparing the samples W and X with the sample D. Samples W and X have a first rib 15a and a second rib 15b. Therefore, compared with sample D, freezing breakage is less likely to occur in samples W and X due to further increased stress dispersion. From the above results, a first rib 15a substantially perpendicular to the first side surface 6b is provided in a portion adjacent to the side portion 6d in the first side surface 6b, and a portion adjacent to the side portion 6d in the second side surface 6c. It can be seen that it is preferable to provide the second rib 15b substantially perpendicular to the second side surface 6c.

なおサンプルＷとサンプルＹの検討結果は同等である。前述のようにサンプルＷの電槽では、第１側面６ｂや第２側面６ｃの厚さが辺部６ｄから遠ざかった部位において小さくなっている。一方、サンプルＹの電槽では、第１側面６ｂおよび第２側面６ｃの厚さが辺部６ｄから遠ざかった部位と辺部６ｄに隣接する部位で同じである。したがって、第１側面６ｂおよび第２側面６ｃのうち辺部６ｄに隣接する部位だけ厚くし、電槽６に用いる樹脂材料を節約した構成でも、凍結破損を抑制する効果が十分に発揮できることがわかる。   In addition, the examination result of the sample W and the sample Y is equivalent. As described above, in the battery case of the sample W, the thickness of the first side surface 6b and the second side surface 6c is small at a portion away from the side portion 6d. On the other hand, in the battery case of sample Y, the thicknesses of the first side surface 6b and the second side surface 6c are the same in the portion away from the side portion 6d and the portion adjacent to the side portion 6d. Therefore, it can be seen that the effect of suppressing freezing damage can be sufficiently exerted even in the configuration in which only the portion adjacent to the side portion 6d of the first side surface 6b and the second side surface 6c is thickened and the resin material used for the battery case 6 is saved. .

なおサンプルＹを除くサンプルでは、第１側面６ｂおよび第２側面６ｃのうち辺部６ｄからそれぞれ２５ｍｍ遠ざかる位置までの部分を「辺部６ｄに隣接する第１部位、第２部位」として他の部位よりも厚くしているが、これは一例に過ぎない。辺部６ｄから遠ざかる部位が「辺部６ｄに隣接する部位」よりも肉薄であれば、電槽６に用いる樹脂材料を節約できる効果がある。   In the samples other than the sample Y, other parts of the first side face 6b and the second side face 6c up to a position away from the side part 6d by 25 mm are referred to as “first part and second part adjacent to the side part 6d”. This is just an example. If the part away from the side part 6d is thinner than the "part adjacent to the side part 6d", the resin material used for the battery case 6 can be saved.

以上、本発明の好適な実施の形態について説明したが、こうした記述は限定事項ではなく、もちろん、種々の改変が可能である。   The preferred embodiment of the present invention has been described above, but such description is not a limitation and, of course, various modifications are possible.

本発明は、特にエンジン始動用の液式鉛蓄電池に有用である。   The present invention is particularly useful for a liquid lead-acid battery for starting an engine.

１ 鉛蓄電池
２ 正極
２Ａ，３Ａ 平面
２Ｂ，３Ｂ 側辺
３ 負極
４ セパレータ
５ 極板群
６ 電槽
６ａ セル室
６ｂ 第１側面
６ｃ 第２側面
６ｄ 辺部
７ 正極ストラップ
８ 負極ストラップ
９，１０ 耳部
１１ 接続体
１２ 正極端子
１３ 負極端子
１４ 蓋
１５ａ 第１リブ
１５ｂ 第２リブ
６０ｂ 第１部位
６０ｃ 第２部位DESCRIPTION OF SYMBOLS 1 Lead storage battery 2 Positive electrode 2A, 3A Plane 2B, 3B Side 3 Negative electrode 4 Separator 5 Electrode group 6 Battery case 6a Cell chamber 6b 1st side surface 6c 2nd side surface 6d Side 7 Positive electrode strap 8 Negative electrode strap 9, 10 Ear part DESCRIPTION OF SYMBOLS 11 Connection body 12 Positive electrode terminal 13 Negative electrode terminal 14 Cover 15a 1st rib 15b 2nd rib 60b 1st site | part 60c 2nd site | part

Claims (3)

それぞれに平面と側辺とを有する平板状の正極と負極と、前記正極と前記負極との間に介在するセパレータと、を有する極板群と、
前記極板群を浸漬する電解液と、
前記極板群と前記電解液とを収納する樹脂製の電槽と、を備え、
前記電槽は、前記正極または前記負極の前記平面と対向する一対の第１側面と、前記正極および前記負極の前記側辺と対向する一対の第２側面と、前記一対の第１側面と前記一対の第２側面とに繋がった底面と、を有し、
前記一対の第１側面の一方と前記一対の第２側面の一方とが接して形成された辺部の厚さの最小値をｔ１、前記一対の第１側面のそれぞれにおいて前記辺部に隣接する第１部位の厚さをｔ２、前記一対の第２側面のそれぞれにおいて前記辺部に隣接する第２部位の厚さをｔ３とするときに、
ｔ１／ｔ２が１．００以上、１．３２以下、ｔ１／ｔ３が１．０４以上、１．３８以下、かつｔ２／ｔ３が０．８９以上、１．２１以下である、
鉛蓄電池。A plate group having a flat plate-like positive electrode and a negative electrode each having a flat surface and a side, and a separator interposed between the positive electrode and the negative electrode;
An electrolyte for immersing the electrode group,
A resin battery case for housing the electrode plate group and the electrolytic solution,
The battery case includes a pair of first side surfaces facing the flat surface of the positive electrode or the negative electrode, a pair of second side surfaces facing the side edges of the positive electrode and the negative electrode, the pair of first side surfaces, and the A bottom surface connected to the pair of second side surfaces,
The minimum value of the thickness of the side portion formed by contacting one of the pair of first side surfaces and one of the pair of second side surfaces is t1, and each of the pair of first side surfaces is adjacent to the side portion. When the thickness of the first part is t2, and the thickness of the second part adjacent to the side part in each of the pair of second side surfaces is t3,
t1 / t2 is 1.00 or more and 1.32 or less, t1 / t3 is 1.04 or more and 1.38 or less, and t2 / t3 is 0.89 or more and 1.21 or less.
Lead acid battery. 前記第１部位には、前記底面から前記一対の第１側面のそれぞれが伸びる方向に沿って伸び、かつ、前記第１側面に略垂直な第１リブが設けられ、
前記第２部位には、前記底面から前記一対の第２側面のそれぞれが伸びる方向に沿って伸び、かつ、前記第２側面に略垂直な第２リブが設けられた、
請求項１に記載の鉛蓄電池。The first portion is provided with a first rib extending in a direction in which each of the pair of first side surfaces extends from the bottom surface and substantially perpendicular to the first side surface,
The second portion is provided with a second rib extending from the bottom surface along a direction in which each of the pair of second side surfaces extends, and substantially perpendicular to the second side surface,
The lead acid battery according to claim 1. 前記底面に平行な前記辺部の断面において、前記辺部の内側の部分の曲率半径は１．７ｍｍ以上である、
請求項１に記載の鉛蓄電池。In the cross section of the side portion parallel to the bottom surface, the radius of curvature of the portion inside the side portion is 1.7 mm or more.
The lead acid battery according to claim 1.
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