JP5879865B2

JP5879865B2 - Seal structure

Info

Publication number: JP5879865B2
Application number: JP2011208416A
Authority: JP
Inventors: 庸介厚見
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2011-09-26
Filing date: 2011-09-26
Publication date: 2016-03-08
Anticipated expiration: 2031-09-26
Also published as: JP2013068300A

Description

この発明はシール構造、特に電池パック外装体のシール構造の改良に関する。 The present invention relates to a sealing structure, and more particularly to an improvement in a sealing structure for a battery pack outer package.

電池パックの外装体を構成する２つの各箱体を、中央の凹部、この凹部の外周を囲うフランジ部、フランジ部に設けたボルト孔から構成し、フランジ部の一方に他方のフランジ部と接触する接触部を設けたものがある（特許文献１参照）。このものでは、２つのフランジ部間に成型ガスケットを介在させ、各フランジ部に設けたボルト孔にボルトを挿通しフランジ部の一方に設けた接触部が他方のフランジ部と接触するように締結することにより凹部に密閉空間を形成している。 Each of the two boxes constituting the battery pack exterior body is composed of a central recess, a flange portion surrounding the outer periphery of the recess, and a bolt hole provided in the flange portion, and one flange portion is in contact with the other flange portion. There is one provided with a contact portion (see Patent Document 1). In this structure, a molded gasket is interposed between two flange portions, and bolts are inserted into bolt holes provided in the respective flange portions so that a contact portion provided on one of the flange portions is brought into contact with the other flange portion. Thus, a sealed space is formed in the recess.

特開平３−１８８６６９号公報Japanese Patent Laid-Open No. 3-188669

しかしながら、上記特許文献１の技術は、被シール体同士を接触させないかまたは接触させられないシール構造には適用することができない。 However, the technique disclosed in Patent Document 1 cannot be applied to a seal structure in which the objects to be sealed are not brought into contact with each other or cannot be brought into contact with each other.

そこで本発明は、被シール体同士を接触させないかまたは接触させられないシール構造においてもシール面間寸法を設定し得るシール構造を提供することを目的とする。 Then, an object of this invention is to provide the seal structure which can set the dimension between seal surfaces also in the seal structure which does not contact to-be-sealed bodies, or is not made to contact.

本発明のシール構造は、シール面間にシール材を挟むことによって密閉空間を形成する被シール体同士のシール構造であって被シール体同士を接触させないかまたは接触させられないシール構造を前提とする。そして、本発明のシール構造では、シール面間寸法を、被シール体同士を締結する段付きボルトと前記密閉空間に供給する大気圧を超えるガスの圧力によって設定する。 The seal structure of the present invention is based on the premise of a seal structure between sealed bodies that forms a sealed space by sandwiching a sealing material between seal surfaces, and the sealed bodies are not brought into contact with each other or cannot be brought into contact with each other. To do. And in the seal structure of this invention, the dimension between seal faces is set with the pressure of the gas exceeding the atmospheric pressure supplied to the stepped volt | bolt which fastens the to-be-sealed bodies together and the said sealed space.

本発明によれば、段付きボルトの大径部の軸方向長さと、密閉空間に供給する大気圧を超えるガスの圧力で被シール体同士のシール面間寸法が定まるので、被シール体同士を接触させないかまたは接触させられないシール構造においてもシール面間寸法を任意に設定することができる。 According to the present invention, the dimension between the sealing surfaces of the sealed bodies is determined by the axial length of the large diameter portion of the stepped bolt and the gas pressure exceeding the atmospheric pressure supplied to the sealed space. Even in a seal structure that is not brought into contact or not brought into contact, the dimension between the seal faces can be arbitrarily set.

本発明の第１実施形態のシール構造が適用される電池パック外装体の分解斜視図である。It is a disassembled perspective view of the battery pack exterior body to which the sealing structure of 1st Embodiment of this invention is applied. ２つの箱体を合わせた状態の電池パック外装体の斜視図である。It is a perspective view of the battery pack exterior body of the state which match | combined two boxes. 電池パック外装体の平面図である。It is a top view of a battery pack exterior body. 図３のＡ−Ａ線断面図である。FIG. 4 is a sectional view taken along line AA in FIG. 3. 電池パック外装体のシール構造を説明するための図３のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 3 for demonstrating the sealing structure of a battery pack exterior body. 電池パック外装体のシール構造を説明するための図３のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG. 3 for demonstrating the sealing structure of a battery pack exterior body. ラミネート型電池を収納した状態での電池パック外装体の縦断面図である。It is a longitudinal cross-sectional view of the battery pack exterior body in the state which accommodated the laminate type battery. 参照例のシール構造との差異を説明するための電池パック外装体の一部縦断面図である。It is a partial longitudinal cross-sectional view of the battery pack exterior body for demonstrating the difference with the seal structure of a reference example. 参照例のシール構造との差異を説明するための電池パック外装体の一部縦断面図である。It is a partial longitudinal cross-sectional view of the battery pack exterior body for demonstrating the difference with the seal structure of a reference example.

（第１実施形態）
図１は本発明の第１実施形態の電池パック外装体２の分解斜視図、図２は電池パック外装体２を構成する２つの箱体を合わせた状態の電池パック外装体２の斜視図を示している。また、図３は電池パック外装体２の平面図、図４は図３のＡ−Ａ線断面図である。なお、図３には段付きボルトを挿通する前の状態を示している。図３のＡ−Ａ線断面図は左右対称の図形となるのであるが、簡略化のため図４では左側部分しか示していない。図１、図２において上方を鉛直上方、下方を鉛直下方とする。 (First embodiment)
FIG. 1 is an exploded perspective view of the battery pack outer package 2 according to the first embodiment of the present invention. FIG. 2 is a perspective view of the battery pack outer package 2 in a state where two boxes constituting the battery pack outer package 2 are combined. Show. 3 is a plan view of the battery pack outer package 2, and FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 3 shows a state before the stepped bolt is inserted. Although the AA line sectional view of FIG. 3 is a left-right symmetric figure, only the left side is shown in FIG. In FIG. 1 and FIG.

図１、図２に示したように、電池パック外装体２は、鉛直下方に開口する上部箱体３（第１の被シール体）と、鉛直上方に開口する下部箱体１１（第２の被シール体）とから構成されている。２つの各箱体３、１１は、アルミニウム等の金属で構成され、２つの各箱体３、１１の外周を囲う、全体として額状でかつ平板状のフランジ部４、１２、各フランジ部４、１２に設けた６個（複数）のボルト孔５、１３を有している。かつ、各箱体３、１１の中央にラミネート型電池４１（図７参照）を収納するための凹部６、１４（図４参照）を有している。以下、上部箱体３のフランジ部４を「上部フランジ部」、下部箱体１１のフランジ部１２を「下部フランジ部」ともいう。また、上部フランジ部４のボルト孔５を「上部ボルト孔」、下部フランジ部１２のボルト孔１３を「下部ボルト孔」ともいう。 As shown in FIGS. 1 and 2, the battery pack outer package 2 includes an upper box 3 (first sealed body) that opens vertically downward and a lower box 11 (second seal) that opens vertically upward. To be sealed). Each of the two box bodies 3 and 11 is made of a metal such as aluminum and surrounds the outer periphery of each of the two box bodies 3 and 11 and has a frame-like and flat plate-like flange portions 4 and 12 and each flange portion 4. , 12 have six (a plurality of) bolt holes 5 and 13. And it has the recessed parts 6 and 14 (refer FIG. 4) for accommodating the laminated battery 41 (refer FIG. 7) in the center of each box 3 and 11. FIG. Hereinafter, the flange portion 4 of the upper box 3 is also referred to as “upper flange portion”, and the flange portion 12 of the lower box 11 is also referred to as “lower flange portion”. Further, the bolt holes 5 of the upper flange portion 4 are also referred to as “upper bolt holes”, and the bolt holes 13 of the lower flange portion 12 are also referred to as “lower bolt holes”.

フランジ部４、１２は箱体３、１１の一部を構成しているため、フランジ部４、１２も被シール体であり、２つのフランジ部４、１２の互いに対向する平面がシール面となる。言い換えると、２つのフランジ部４、１２の互いに対向する側、つまり上部フランジ部４の下面４ａと下部フランジ部１２の上面１２ａとがシール面である。このシール面（４ａ、１２ａ）の間にシール材２１を挟み、各フランジ部４、１２のボルト孔５、１３の位置を段付きボルト２５が挿通し得るように合わせる（図３参照）。 Since the flange parts 4 and 12 constitute a part of the box bodies 3 and 11, the flange parts 4 and 12 are also sealed bodies, and the planes of the two flange parts 4 and 12 facing each other serve as seal surfaces. . In other words, the opposite sides of the two flange portions 4 and 12, that is, the lower surface 4a of the upper flange portion 4 and the upper surface 12a of the lower flange portion 12 are sealing surfaces. The sealing material 21 is sandwiched between the sealing surfaces (4a, 12a), and the bolt holes 5, 13 of the flange portions 4, 12 are aligned so that the stepped bolts 25 can be inserted (see FIG. 3).

シール面（４ａ、１２ａ）にシール材２１を設ける方法は問わない。例えばシール材の入っているチューブから押し出すようにしてシール材を絞り出しつつ下部フランジ部１２の周方向に沿って切れ目なく介在させればよい（図１参照）。シール材２１の具体例としては、天然ゴム、合成ゴム、樹脂、植物繊維などであって弾性を有するものであればよい。 The method of providing the sealing material 21 on the sealing surfaces (4a, 12a) is not limited. For example, the sealing material may be squeezed out from the tube containing the sealing material and may be interposed along the circumferential direction of the lower flange portion 12 (see FIG. 1). Specific examples of the sealing material 21 may be natural rubber, synthetic rubber, resin, vegetable fiber, or the like that has elasticity.

そして、孔の中心を合わせた２つのボルト孔５、１３に段付きボルト２５を、雄ねじ部を形成してある軸２７の側から挿通して締結することにより、凹部６、１４に密閉空間１５を形成し（図４参照）、全体としては箱状の電池パック外装体２が形成される。２つのボルト孔５、１３に挿通するのは段付きボルト２５であるため、上部ボルト孔５と下部ボルト孔１３の各孔径は相違するものとなっている。なお、ボルト孔５、１３とシール材２１と位置関については、シール材２１の水平方向外側に位置するように各ボルト孔５、１３を各フランジ部３、１２に設けている（図１参照）。 Then, by inserting a stepped bolt 25 from the side of the shaft 27 on which the male screw portion is formed and fastening it into the two bolt holes 5 and 13 in which the centers of the holes are aligned, the sealed space 15 is formed in the recessed portions 6 and 14. (Refer to FIG. 4), and a box-shaped battery pack exterior body 2 is formed as a whole. Since it is the stepped bolt 25 that passes through the two bolt holes 5 and 13, the diameters of the upper bolt hole 5 and the lower bolt hole 13 are different. In addition, regarding the bolt holes 5 and 13 and the sealing material 21, the bolt holes 5 and 13 are provided in the flange portions 3 and 12 so as to be positioned outside the sealing material 21 in the horizontal direction (see FIG. 1). ).

一般的なボルト３１は、図８左側にも示したように頭部３２と軸部３３とから構成され、軸部３３に雄ねじ部３４を有するものである。一方、第１実施形態で用いる段付きボルト２５も、基本的な構成は一般的なボルト３１と変わらない。つまり、段付きボルト２５も、頭部２６と軸部２７とから構成され、軸部２７に雄ねじ部２８を有している。 As shown on the left side of FIG. 8, the general bolt 31 includes a head portion 32 and a shaft portion 33, and has a male screw portion 34 on the shaft portion 33. On the other hand, the basic structure of the stepped bolt 25 used in the first embodiment is the same as that of the general bolt 31. That is, the stepped bolt 25 is also composed of a head portion 26 and a shaft portion 27, and has a male screw portion 28 on the shaft portion 27.

さらに、段付きボルト２５は、一般的なボルト３１と相違して図４に示したように、頭部２６と、鉛直下方の軸端２７ａとの間に軸部２７よりも外径が大きくかつ頭部２６の外周よりも外径が小さな円柱状の大径部２９を有している。このため、段付きボルト２５は、軸方向（図４で鉛直方向）に全体として２段の段付き状に形成されている。すなわち、下方の段付きは、雄ねじ部２８と大径部２９の下面２９ａとの間に、上方の段付きは、頭部２６の下面２６ａと大径部２９との間に形成されている。 Further, unlike the general bolt 31, the stepped bolt 25 has an outer diameter larger than that of the shaft portion 27 between the head portion 26 and the shaft end 27a vertically below, as shown in FIG. A cylindrical large-diameter portion 29 having an outer diameter smaller than the outer periphery of the head 26 is provided. Therefore, the stepped bolt 25 is formed in a two-stepped shape as a whole in the axial direction (vertical direction in FIG. 4). That is, the lower step is formed between the male screw portion 28 and the lower surface 29 a of the large diameter portion 29, and the upper step is formed between the lower surface 26 a of the head 26 and the large diameter portion 29.

段付きボルト２５で上下２つのフランジ部４、１２を締結するには、大径部２９の外径より余裕を持って上部ボルト孔５の孔径を定め（上部ボルト孔５に雌ねじを切ることは不要）、また下部ボルト孔１３には、雄ねじ部２８ときつく螺合する雌ねじを切っておく。下部ボルト孔１３にきつい雌ねじを切らず、雄ねじ部２８が下部ボルト孔１３を押し広げることによって段付きボルト２５を締結させることもできる。雄ねじ部２８の長さは、下部フランジ１２の上面１２ａと下面１２ｂの間の上下方向厚さに合わせたものとする。 In order to fasten the upper and lower flange parts 4, 12 with the stepped bolt 25, the hole diameter of the upper bolt hole 5 is determined with a margin from the outer diameter of the large diameter part 29 (cutting a female screw in the upper bolt hole 5 Unnecessary), and the lower bolt hole 13 is cut with a female screw that is screwed into the male screw portion 28. It is also possible to fasten the stepped bolt 25 by the male screw portion 28 pushing and expanding the lower bolt hole 13 without cutting the lower screw hole 13 tightly. The length of the male screw portion 28 is set to match the vertical thickness between the upper surface 12a and the lower surface 12b of the lower flange 12.

段付きボルト２５の形状や各部の寸法比は図４に示したものに限られない。図４には頭部２６が六角柱状である場合を示したが、頭部自体を円柱状やドーム状に形成し頭部の中央に六角柱状の孔や十字孔を形成したものであってもかまわない。大径部２９は円柱状でなくても多角柱状でもかまわない。 The shape of the stepped bolt 25 and the dimensional ratio of each part are not limited to those shown in FIG. Although FIG. 4 shows the case where the head 26 has a hexagonal columnar shape, the head itself may be formed in a columnar shape or a dome shape, and a hexagonal columnar hole or cross hole may be formed in the center of the head. It doesn't matter. The large-diameter portion 29 may not be a columnar shape but may be a polygonal columnar shape.

次に、図５を用いて段付きボルト２５による電池パック外装体２のシール構造を具体的に説明する。ここで、図５の左側が段付きボルト締結前の電池パック外装体２の状態を、図５の右側が段付きボルト締結後の電池パック外装体２の状態を示している。左右の各図は基本的に図４と同様に図３のＡ−Ａ線断面図であるので、図４と同一部分には同一番号を付している。ここでも簡略化のため図４と同様に図３のＡ−Ａ線断面図のうち左側部分のみを示している。 Next, the sealing structure of the battery pack outer package 2 with the stepped bolts 25 will be specifically described with reference to FIG. Here, the left side of FIG. 5 shows the state of the battery pack exterior body 2 before the stepped bolt fastening, and the right side of FIG. 5 shows the state of the battery pack exterior body 2 after the stepped bolt fastening. Each of the left and right drawings is basically a cross-sectional view taken along the line AA of FIG. 3 similarly to FIG. 4, and therefore the same parts as those in FIG. Here, for the sake of simplification, only the left portion of the cross-sectional view taken along the line AA of FIG. 3 is shown as in FIG.

前提として、シール材２１は図５左側に示したように規定のシール面間寸法より鉛直方向上方に盛り上げておく。ここで、「シール面間寸法」とは２つのフランジ部４、１２の対向する平面の間の最短距離のことである。また、「規定のシール面間寸法」とはシール面間寸法の要求値（あるいは目標値）のことである。従って、段付きボルトの締結に際しては、実際のシール面間寸法をこの「規定のシール面間寸法」と一致させる必要がある。 As a premise, as shown in the left side of FIG. 5, the sealing material 21 is raised upward in the vertical direction from the prescribed dimension between the sealing surfaces. Here, the “dimension between seal surfaces” is the shortest distance between the planes where the two flange portions 4 and 12 face each other. Further, the “specified dimension between seal faces” is a required value (or target value) of the dimension between seal faces. Therefore, when tightening the stepped bolt, it is necessary to make the actual dimension between the seal surfaces coincide with this “specified dimension between the seal surfaces”.

図５左側には段付きボルトの締結前に実際のシール面間寸法が規定のシール面間寸法以上に浮いている場合を示している。「浮いている」とは実際のシール面間寸法が規定のシール面間寸法より大きいことをいう。この場合には、図５左側に示したように段付きボルト２５の軸側を鉛直下方に向けて２つのボルト孔５、１３に挿通する。そして、シール材２１を押しつぶしながら雄ねじ部２８を下部ボルト孔１３に有する雌ねじにきつく螺合させることで締結し、凹部６、１４に密閉空間１５を形成する。「きつく」とは、一定の振動耐久実験を行った後でも段付きボルト２５が下部ボルト孔１３から外れないことをいう。段付きボルト２５を締結することにより段付きボルト２５の頭部下面２６ａと上部フランジ部４の上面４ｂとが接触（当接）し、かつ段付きボルト２５の大径部２９の下面２９ａと下部フランジ部１２の上面１２ａとが接触（当接）する。これによって段付きボルトの締結後には、図５右側に示したように、実際のシール面間寸法が規定のシール面間寸法と一致する。 The left side of FIG. 5 shows a case where the actual dimension between the sealing surfaces is higher than the prescribed dimension between the sealing surfaces before the fastening of the stepped bolt. “Floating” means that the actual dimension between seal faces is larger than the prescribed dimension between seal faces. In this case, as shown on the left side of FIG. 5, the stepped bolt 25 is inserted through the two bolt holes 5 and 13 with the shaft side facing vertically downward. Then, the sealing member 21 is crushed and fastened by tightly engaging the male screw portion 28 with the female screw included in the lower bolt hole 13 to form the sealed space 15 in the recesses 6 and 14. “Tight” means that the stepped bolt 25 does not come off the lower bolt hole 13 even after a certain vibration endurance experiment. By fastening the stepped bolt 25, the head lower surface 26a of the stepped bolt 25 and the upper surface 4b of the upper flange portion 4 come into contact (contact), and the lower surface 29a of the large-diameter portion 29 of the stepped bolt 25 and the lower portion The upper surface 12a of the flange portion 12 comes into contact (contact). As a result, after the stepped bolt is fastened, as shown on the right side of FIG. 5, the actual dimension between the seal faces coincides with the prescribed dimension between the seal faces.

図５右側において、大径部２９の軸方向長さをＬ、上部フランジ部４の鉛直方向厚さをＤとしたとき、幾何学より「規定のシール面間寸法」はＬ−Ｄで定まることとなる。つまり、本実施形態のシール構造において規定のシール面間寸法を定める因子はＬとＤの２つである。このように２つの因子によって規定のシール面間寸法を定めることで、因子が一つだけの場合より本実施形態のシール構造を採用する自由度が広がる。 On the right side of FIG. 5, when the axial length of the large-diameter portion 29 is L and the vertical thickness of the upper flange portion 4 is D, the “specified dimension between seal faces” is determined by geometry as L−D. It becomes. That is, there are two factors, L and D, that determine the prescribed seal surface dimension in the seal structure of the present embodiment. In this way, by defining the predetermined seal surface dimension by two factors, the degree of freedom in adopting the seal structure of the present embodiment is wider than the case where there is only one factor.

さて、電池パックの外装体を構成する２つの各箱体を、中央の凹部、この凹部の外周を囲うフランジ部、フランジ部に設けたボルト孔から構成し、フランジ部の一方に他方のフランジ部と接触する接触部を設けた従来装置がある。このものでは、２つのフランジ部間に成型ガスケットを介在させ、各フランジ部に設けたボルト孔にボルトを挿通しフランジ部の一方に設けた接触部が他方のフランジ部と接触するように締結することにより凹部に密閉空間を形成している。しかしながら、成型ガスケットを用いたシール方法は、ガスケットの成型時に専用の型を必要とするため高価である。また、成型ガスケットを圧縮するため、（１）ボルト締結点数が多い、（２）ガスケットセットの作業工数がかかる、（３）成型ガスケットの追従性が悪いため比較的高い面精度が求められる、といった問題点もある。 Now, each of the two boxes constituting the battery pack exterior body is composed of a central concave portion, a flange portion surrounding the outer periphery of the concave portion, and a bolt hole provided in the flange portion. There is a conventional device provided with a contact portion that comes into contact. In this structure, a molded gasket is interposed between two flange portions, and bolts are inserted into bolt holes provided in the respective flange portions so that a contact portion provided on one of the flange portions is brought into contact with the other flange portion. Thus, a sealed space is formed in the recess. However, a sealing method using a molded gasket is expensive because a special mold is required when molding the gasket. In addition, since the molded gasket is compressed, (1) the number of bolt fastening points is large, (2) the work time of the gasket set is increased, and (3) relatively high surface accuracy is required because the followability of the molded gasket is poor. There are also problems.

その解決方法として、互いに対面するシール面間（フランジ部間）に室温硬化性の液状ゴムを介在させてシール面間をシールする。その際、シール材の接着強度を確保するために一定のシール面間を確保する必要があることから、シール部近傍の被シール体同士（フランジ部同士）を接触させた構造を持たせるようにするものがある。しかしながら、このものでは、被シール体同士を接触させない構造あるいは被シール体同士を接触させられない構造の場合にシール面間を任意に設定できないという問題がある。 As a solution to this problem, a seal between the seal surfaces is made by interposing a room temperature curable liquid rubber between the seal surfaces facing each other (between the flange portions). At that time, in order to secure the adhesive strength of the sealing material, it is necessary to ensure a certain space between the sealing surfaces. There is something to do. However, with this structure, there is a problem that the seal surfaces cannot be arbitrarily set in the case of a structure in which the objects to be sealed are not in contact with each other or a structure in which the objects to be sealed are not in contact with each other.

一方、図５右側に示したように本実施形態のシール構造では、２つのフランジ部４、１２の間が規定のシール面間寸法として規定され、従って２つのフランジ部４、１２は直接接触していない。このように、フランジ部４、１２同士（被シール体同士）を接触させない構造の場合においても、本実施形態のシール構造によれば、大径部２９の軸方向長さＬ及び上部フランジ部４の厚さＤによってシール面間寸法を任意に設定できるのである。 On the other hand, as shown on the right side of FIG. 5, in the seal structure of the present embodiment, the distance between the two flange portions 4 and 12 is defined as a predetermined dimension between the seal surfaces, and therefore the two flange portions 4 and 12 are in direct contact with each other. Not. Thus, even in the case of a structure in which the flange portions 4 and 12 (sealed bodies to be sealed) are not in contact with each other, according to the seal structure of the present embodiment, the axial length L of the large-diameter portion 29 and the upper flange portion 4. The dimension between the seal surfaces can be arbitrarily set according to the thickness D of the sheet.

図６は段付きボルトの締結後かつ加圧工程前に実際のシール面間寸法が規定のシール面間寸法未満に沈んでいる場合であっても、規定のシール面間寸法が得られることを説明するものである。「沈んでいる」とは実際のシール面間寸法が規定のシール面間寸法より小さいことをいう。ここで、図６の左側が段付きボルトの締結後かつ加圧工程前の電池パック外装体２の状態を、図６の右側が加圧工程後の電池パック外装体２の状態を示している。左右の各図は基本的に図４と同様に図３のＡ−Ａ線断面図であるので、図４と同一部分には同一番号を付している。ここでも簡略化のため図４と同様に図３のＡ−Ａ線断面図のうち左側部分のみを示している。 FIG. 6 shows that the specified seal face-to-face dimension can be obtained even when the actual seal face-to-face dimension is below the specified seal face-to-face dimension after fastening the stepped bolt and before the pressurizing process. Explain. “Sinking” means that the actual dimension between seal faces is smaller than the prescribed dimension between seal faces. Here, the left side of FIG. 6 shows the state of the battery pack exterior body 2 after fastening the stepped bolt and before the pressurizing step, and the right side of FIG. 6 shows the state of the battery pack exterior body 2 after the pressurizing step. . Each of the left and right drawings is basically a cross-sectional view taken along the line AA of FIG. 3 similarly to FIG. 4, and therefore the same parts as those in FIG. Here, for the sake of simplification, only the left portion of the cross-sectional view taken along the line AA of FIG.

段付きボルトの締結前に実際のシール面間寸法が規定のシール面間寸法未満に沈んでいる場合にも、図５左側に示したのと同様の作業を行う。すなわち、段付きボルト２５の軸側を鉛直下方に向けて２つのボルト孔５、１３に挿通する。そして、シール材２１を押しつぶしながら雄ねじ部２８を下部ボルト孔１３に有する雌ねじにきつく螺合させることで締結し、凹部６、１４に密閉空間１５を形成する。しかしながら、段付きボルトの締結後に、図６左側に示したように段付きボルト２５の頭部下面２６ａと上部フランジ部４の上面４ｂとが鉛直方向の上下に離れて接触しておらず、従って、段付きボルトの締結後に実際のシール面間寸法が規定のシール面間寸法となっていないことがあり得る。上部ボルト孔５の孔径を大径部２９の外径より余裕をもって設定していれば、段付きボルトの締結後にほとんどの場合に図５右側に示したように規定のシール面間寸法が得られる。しかしながら、まれに大径部２９の外周と上部ボルト孔５とが摩擦等で付着したり、大径部２９の外周と上部ボルト孔５の隙間に異物が噛み込んだりすることがあり、この場合に、図６左側に示した状態が出現する。 Even when the actual dimension between the seal faces sinks below the prescribed dimension between the seal faces before the stepped bolt is fastened, the same operation as shown on the left side of FIG. 5 is performed. In other words, the stepped bolt 25 is inserted through the two bolt holes 5 and 13 with the shaft side thereof directed vertically downward. Then, the sealing member 21 is crushed and fastened by tightly engaging the male screw portion 28 with the female screw included in the lower bolt hole 13 to form the sealed space 15 in the recesses 6 and 14. However, after the stepped bolts are fastened, the head lower surface 26a of the stepped bolt 25 and the upper surface 4b of the upper flange portion 4 are not in contact with each other in the vertical direction as shown on the left side of FIG. After tightening the stepped bolt, the actual seal surface dimension may not be the prescribed seal surface dimension. If the hole diameter of the upper bolt hole 5 is set with a margin from the outer diameter of the large-diameter portion 29, the specified seal face dimension can be obtained in most cases after the fastening of the stepped bolt as shown on the right side of FIG. . However, in some cases, the outer periphery of the large-diameter portion 29 and the upper bolt hole 5 may adhere due to friction or the like, or foreign matter may be caught in the gap between the outer periphery of the large-diameter portion 29 and the upper bolt hole 5. Then, the state shown on the left side of FIG. 6 appears.

さて、本実施形態の電池パック外装体２には、各箱体３、１１に設けた凹部６、１４により形成される密閉空間１５に複数のラミネート型電池４１を図７に示したように鉛直方向に積層して収納することとなる。ここで、「ラミネート型電池」とは、実際に充放電反応が進行する略四角扁平状の発電要素を電池外装体である高分子−金属複合ラミネートフィルムで被覆し、発電要素の周辺部を熱融着によって接合することにより、発電要素を密封したものである。ラミネート型電池４１の高分子−金属複合ラミネートフィルムは柔らかく、単１電池や単３電池のように堅い金属製外枠を持たない。この金属製外枠の働きを有するのが、アルミニウム等の金属で構成される電池パック外装体２である。このため、ラミネート型電池４１を電池パック外装体２の密閉空間１５に収納して、段付きボルト２５で締結した後には、電池パック外装体２の一部に設けた加圧空気供給孔１６に加圧空気供給通路５１を接続し、エアポンプ５２からの所定圧の空気を密閉空間１５に供給した後に当該孔１６を塞ぎ、ラミネート型電池４１を加圧空気で加圧された状態に置く。これは、ラミネート型電池４１を周囲から加圧することで、ラミネート型電池４１の内部でのガスの発生を抑制して、ラミネート型電池４１の電池性能を確保するためである。なお、ラミネート側電池４１を電池パック外装体２の密閉空間１５を加圧状態とするためのガスは、空気に限らず、不活性ガスであってよい。なお、図７の開閉弁５３、圧力センサ５４については説明しなかったが、これについては後述する。 Now, in the battery pack outer package 2 of the present embodiment, a plurality of laminated batteries 41 are vertically arranged in a sealed space 15 formed by recesses 6 and 14 provided in the respective boxes 3 and 11 as shown in FIG. It will be stacked and stored in the direction. Here, the term “laminated battery” refers to a substantially square flat power generation element in which a charge / discharge reaction actually proceeds is covered with a polymer-metal composite laminate film that is a battery exterior body, and the periphery of the power generation element is heated. The power generation element is hermetically sealed by bonding by fusion. The polymer-metal composite laminate film of the laminate-type battery 41 is soft and does not have a hard metal outer frame like the AA batteries and the AA batteries. The battery pack outer package 2 made of a metal such as aluminum has the function of the metal outer frame. For this reason, after the laminated battery 41 is stored in the sealed space 15 of the battery pack outer package 2 and fastened with the stepped bolts 25, the pressurized air supply hole 16 provided in a part of the battery pack outer package 2 is used. The pressurized air supply passage 51 is connected, air of a predetermined pressure from the air pump 52 is supplied to the sealed space 15, the hole 16 is closed, and the laminated battery 41 is placed in a state pressurized with pressurized air. This is because pressurization of the laminate type battery 41 from the surroundings suppresses the generation of gas inside the laminate type battery 41 and ensures the battery performance of the laminate type battery 41. In addition, the gas for making the sealed battery 15 pressurize the sealed space 15 of the battery pack outer package 2 is not limited to air but may be an inert gas. Although the on-off valve 53 and the pressure sensor 54 in FIG. 7 have not been described, these will be described later.

このように、電池パック外装体２にラミネート型電池４１を収納した後には加圧工程があるので、この加圧工程における加圧空気による加圧を利用することで図６左側に示した状態を解消する。すなわち、段付きボルト２５で締結した後に加圧工程において、加圧空気供給孔１６から所定圧の加圧空気を密閉空間１５に供給したとき、密閉空間１５に供給された加圧空気が図６左側に上向き矢印で示したように、上部箱体３を鉛直上方に向けて押し上げる。言い換えると、２つの箱体３、１１同士（被シール体同士）に離間させる方向に力が与えられる。上部箱体３を鉛直上方に向けて押し上げることで、大径部２９の外周と上部ボルト孔５とが摩擦等で付着していたのが解消され、あるいは大径部２９の外周と上部ボルト孔５の隙間に噛み込んでいた異物が取り去られる。これによって、上部フランジ部４の上面４ｂが段付きボルト２５の頭部下面２６ａに当接するまで上部フランジ部４が鉛直上方に移動し、図６右側に示す状態となる。すなわち、図６右側に示したように、段付きボルト２５の頭部下面２６ａと上部フランジ部４の上面４ｂとが接触（当接）し、実際のシール面間寸法が規定のシール面間寸法と一致する。言い換えると、段付きボルトの締結後に実際のシール面間寸法が規定のシール面間寸法未満に沈んでいる場合にも、図６右側の状態となって規定のシール面間寸法が得られるように、大径部２９の外径と上部ボルト孔４の内径とを適合により最適に設定しておくのである。 As described above, since there is a pressurization step after the laminate type battery 41 is stored in the battery pack outer package 2, the state shown on the left side of FIG. Eliminate. That is, in the pressurizing step after fastening with the stepped bolt 25, when pressurized air of a predetermined pressure is supplied from the pressurized air supply hole 16 to the sealed space 15, the pressurized air supplied to the sealed space 15 is shown in FIG. As indicated by the upward arrow on the left side, the upper box 3 is pushed upward vertically. In other words, force is applied in the direction of separating the two box bodies 3 and 11 (sealed bodies). By pushing up the upper box 3 vertically upward, the outer periphery of the large-diameter portion 29 and the upper bolt hole 5 are eliminated due to friction or the like, or the outer periphery of the large-diameter portion 29 and the upper bolt hole The foreign matter biting into the gap 5 is removed. As a result, the upper flange portion 4 moves vertically upward until the upper surface 4b of the upper flange portion 4 abuts against the head lower surface 26a of the stepped bolt 25, resulting in the state shown on the right side of FIG. That is, as shown on the right side of FIG. 6, the head lower surface 26 a of the stepped bolt 25 and the upper surface 4 b of the upper flange portion 4 are in contact (contact), and the actual seal surface dimension is the prescribed seal surface dimension. Matches. In other words, even when the actual seal surface dimension is below the specified seal surface dimension after fastening the stepped bolt, the specified seal surface dimension can be obtained in the state shown in the right side of FIG. The outer diameter of the large-diameter portion 29 and the inner diameter of the upper bolt hole 4 are set optimally by matching.

なお、実際のシール面間寸法が加圧工程中に規定のシール面間寸法へと広がることに合わせてシール材２１が鉛直方向に膨らむことが、つまりシール材２１によって空間１５を密閉状態に保たせるためには、シール材２１に弾性を有することが必要である。 It should be noted that the seal material 21 may swell in the vertical direction as the actual seal surface dimension expands to the prescribed seal surface dimension during the pressurization process, that is, the seal material 21 keeps the space 15 in a sealed state. In order to make it stick, it is necessary for the sealing material 21 to have elasticity.

図６では電池パック外装体２の密閉空間１５にラミネート型電池４１を収納するものにおいて、加圧工程における加圧空気による加圧を利用して規定のシール面間寸法を得る場合を説明したが、これに限られない。例えば、電池パック外装体２の密閉空間１５にラミネート型電池４１を収納するものにおいて、電池パック外装体２のリークテストを行うものがある。これについても図７により説明する。このものでは、図７に示したように、加圧空気供給孔１６から大気圧を超える所定圧（リークテスト圧）の空気を供給すると共に、加圧空気の供給開始から一定時間の経過後には加圧空気供給通路５１に設けた開閉弁５３を閉じて空間１５を密閉状態とする。そして、電池パック外装体２の密閉空間１５の圧力を圧力センサ５４により検出し、電池パック外装体２に漏れがあるか否かをテストする。 In FIG. 6, the case where the laminate type battery 41 is accommodated in the sealed space 15 of the battery pack outer package 2 has been described in the case of obtaining a predetermined seal surface dimension using the pressurization by the pressurized air in the pressurizing step. Not limited to this. For example, in the case where the laminated battery 41 is accommodated in the sealed space 15 of the battery pack outer package 2, there is one that performs a leak test of the battery pack outer package 2. This will also be described with reference to FIG. In this case, as shown in FIG. 7, air having a predetermined pressure (leak test pressure) exceeding atmospheric pressure is supplied from the pressurized air supply hole 16, and after a certain period of time has elapsed from the start of supply of pressurized air. The on-off valve 53 provided in the pressurized air supply passage 51 is closed to make the space 15 sealed. Then, the pressure of the sealed space 15 of the battery pack exterior body 2 is detected by the pressure sensor 54 to test whether the battery pack exterior body 2 has a leak.

このようにしてリークテストを行なうものでも、加圧空気供給孔１６から大気圧を超える所定圧（リークテスト圧）の加圧空気を密閉空間１５に供給したとき、密閉空間１５に供給された加圧空気が図６左側に上向き矢印で示したように、上部箱体３を鉛直上方に押し上げる。言い換えると、２つの箱体３、１１同士（被シール体同士）に離間させる方向に力が与えられる。上部箱体３を鉛直上方に押し上げることで、大径部２９の外周と上部ボルト孔５とが摩擦等で付着していたのが解消され、あるいは大径部２９の外周と上部ボルト孔５の隙間に噛み込んでいた異物が取り去られる。これによって、上部フランジ部４の上面４ｂが段付きボルト２５の頭部下面２６ａに当接するまで上部フランジ部４が鉛直上方に移動し、図６右側に示す状態となる。すなわち、段付きボルト２５の頭部下面２６ａとフランジ部４の上面４ｂとが接触（当接）し、実際のシール面間寸法が規定のシール面間寸法と一致する。このように、電池パック外装体２の有する密閉空間１５に対してリークテストを行うものでは、このリークテスト時における加圧空気による加圧を利用して、規定のシール面間寸法を得ることができる。 Even in the case of performing a leak test in this way, when pressurized air having a predetermined pressure (leak test pressure) exceeding the atmospheric pressure is supplied from the pressurized air supply hole 16 to the sealed space 15, the pressure supplied to the sealed space 15 is increased. As shown by the upward arrow on the left side of FIG. 6, the compressed air pushes the upper box 3 up vertically. In other words, force is applied in the direction of separating the two box bodies 3 and 11 (sealed bodies). By pushing up the upper box 3 vertically upward, the outer periphery of the large-diameter portion 29 and the upper bolt hole 5 are prevented from adhering due to friction or the like, or the outer periphery of the large-diameter portion 29 and the upper bolt hole 5 Foreign matter that has been bitten in the gap is removed. As a result, the upper flange portion 4 moves vertically upward until the upper surface 4b of the upper flange portion 4 abuts against the head lower surface 26a of the stepped bolt 25, resulting in the state shown on the right side of FIG. That is, the head lower surface 26a of the stepped bolt 25 and the upper surface 4b of the flange portion 4 are in contact (contact), and the actual seal surface dimension matches the prescribed seal surface dimension. As described above, in the case where the leak test is performed on the sealed space 15 of the battery pack outer package 2, a predetermined dimension between the seal surfaces can be obtained by using the pressurization by the pressurized air at the time of the leak test. it can.

（参照例との比較）
次に、図８、図９は参照例のシール構造との差異を説明するための電池パック外装体２の一部縦断面図である。比較のため、図８、図９の右側に第１実施形態の電池パック外装体２の一部縦断面図を、図８、図９の左側に参照例の電池パック外装体２の一部縦断面図を示している。図４と同一部分には同一番号を付している。 (Comparison with reference example)
Next, FIGS. 8 and 9 are partial longitudinal sectional views of the battery pack outer package 2 for explaining the difference from the seal structure of the reference example. For comparison, a partial longitudinal sectional view of the battery pack exterior body 2 of the first embodiment is shown on the right side of FIGS. 8 and 9, and a partial longitudinal section of the battery pack exterior body 2 of the reference example is shown on the left side of FIGS. A plane view is shown. The same parts as those in FIG.

参照例を先に説明する。参照例は、図８左側に示したように、上部フランジ部４の水平方向の内側（図８で右側）から鉛直下方に延びる壁状部位を、下部箱体１１との接触部７として追加し、この接触部７の水平方向外側にシール材２１を介在させるものである。以下、下部箱体１１との接触部７を単に「接触部７」という。そして、参照例では接触部７の下面７ａと下部フランジ部１２の上面１２ａとが接触するように一般的なボルト３１で締結している。 Reference examples will be described first. In the reference example, as shown on the left side of FIG. 8, a wall-like portion extending vertically downward from the horizontal inner side (right side in FIG. 8) of the upper flange portion 4 is added as a contact portion 7 with the lower box 11. The sealing material 21 is interposed outside the contact portion 7 in the horizontal direction. Hereinafter, the contact portion 7 with the lower box 11 is simply referred to as “contact portion 7”. And in the reference example, it fastens with the general volt | bolt 31 so that the lower surface 7a of the contact part 7 and the upper surface 12a of the lower flange part 12 may contact.

一般的なボルト３１は、頭部３２と軸部３３とから構成され、軸部３３に雄ねじ部３４を有するものである。２つのボルト孔５、１３はボルト３１の雄ねじ部３４に合わせてある。 The general bolt 31 includes a head portion 32 and a shaft portion 33, and has a male screw portion 34 on the shaft portion 33. The two bolt holes 5 and 13 are matched with the male thread portion 34 of the bolt 31.

まず図８は、参照例のシール構造と第１実施形態のシール構造とのコストの違いを検討したものである。図８左側に示す参照例のシール構造では、接触部７の鉛直方向長さでシール面間寸法を設定することになる。一方、図８右側に示す第１実施形態のシール構造では、接触部７は不要である。すなわち、第１実施形態のシール構造では、２つのフランジ部４、１２のシール面（４ａ、１２ａ）を直接接触させることなく規定のシール面間寸法を得ている。このため、一般的なボルト３１から段付きボルト２５に変更することによってアップする費用と、接触部７を追加する工賃と比較し、段付きボルト２５に変更することによってアップする費用が接触部７を追加する工賃より低ければ、コストを参照例のシール構造より低減することができる。 First, FIG. 8 examines the difference in cost between the seal structure of the reference example and the seal structure of the first embodiment. In the seal structure of the reference example shown on the left side of FIG. 8, the dimension between the seal surfaces is set by the vertical length of the contact portion 7. On the other hand, in the seal structure of the first embodiment shown on the right side of FIG. That is, in the seal structure of the first embodiment, a predetermined dimension between the seal surfaces is obtained without directly contacting the seal surfaces (4a, 12a) of the two flange portions 4, 12. For this reason, compared with the expense which increases by changing from the general bolt 31 to the stepped bolt 25, and the wage which adds the contact part 7, the expense which increases by changing to the stepped bolt 25 is the contact part 7 If it is lower than the wage for adding, the cost can be reduced as compared with the seal structure of the reference example.

次に、図９は参照例のシール構造と第１実施形態のシール構造との分解作業性の違いを検討したものである。参照例のシール構造では上部箱体３と下部箱体１１とに分解するに際して、図９左側に示したように、一般的なボルト３１をボルト孔５、１３から取り外した後に、シール材２１に対して、接触部７にまで届く切り込み６１を入れ、その後に工具等によりこじ開ける必要がある。一方、第１実施形態のシール構造では、段付きボルト２５をボルト孔５、１３から取り外した後には、図９右側に示したように２つのフランジ部４、１２の間（シール面間）にシール材２１以外のものがない。このため、シール材２１を上下２つの部位２１ａ、２１ｂに直接切断するだけで上部箱体３と下部箱体１１とに簡単に分解することができ、上部箱体３と下部箱体１１とに分解する作業が参照例のシール構造より容易である。 Next, FIG. 9 examines the difference in disassembly workability between the seal structure of the reference example and the seal structure of the first embodiment. When disassembling into the upper box 3 and the lower box 11 in the seal structure of the reference example, the general bolt 31 is removed from the bolt holes 5 and 13 as shown in the left side of FIG. On the other hand, it is necessary to make a cut 61 that reaches the contact portion 7 and then pry it open with a tool or the like. On the other hand, in the seal structure of the first embodiment, after the stepped bolt 25 is removed from the bolt holes 5 and 13, as shown on the right side of FIG. 9, between the two flange portions 4 and 12 (between the seal surfaces). There is nothing other than the sealing material 21. For this reason, it can be easily disassembled into the upper box 3 and the lower box 11 by directly cutting the sealing material 21 into the upper and lower two parts 21a, 21b. The disassembling work is easier than the seal structure of the reference example.

ここで、第１実施形態の作用効果を説明する。 Here, the function and effect of the first embodiment will be described.

第１実施形態によれば、シール面（４ａ、１２ａ）間にシール材２１を挟むことによって密閉空間１５を形成する箱体３、１１同士（被シール体同士）のシール構造であって箱体３、１１同士を接触させないシール構造において、シール面間寸法を、段付きボルト２５と密閉空間１５に供給する大気圧を超える空気（ガス）の圧力によって設定するので、段付きボルト１５の大径部２９の軸方向長さＬで箱体３、１１同士のシール面間寸法が定まる。これによって、箱体３、１１同士を直接接触させないシール構造においても、規定のシール面間寸法を任意に設定することができる。 According to 1st Embodiment, it is a sealing structure of the box bodies 3 and 11 (sealed bodies to be sealed) which form the sealed space 15 by sandwiching the sealing material 21 between the sealing surfaces (4a, 12a), and the box body 3 and 11, in the seal structure in which the 11 and 11 are not in contact with each other, the dimension between the seal faces is set by the pressure of the air (gas) exceeding the atmospheric pressure supplied to the stepped bolt 25 and the sealed space 15, so the large diameter of the stepped bolt 15 The dimension between the sealing surfaces of the boxes 3 and 11 is determined by the axial length L of the portion 29. Thereby, even in the seal structure in which the boxes 3 and 11 are not in direct contact with each other, the prescribed dimension between the seal surfaces can be arbitrarily set.

さらに第１実施形態によれば、次の効果を得ることができる。箱体３、１１に参照例のシール構造で示した接触部７（図８左側参照）が不要になるので、箱体３、１１に接触部７を追加する工賃が不要になる。また、シール面間にシール材２１以外のものがいないので、シール材２１を直接切断するだけで２つの箱体３、１１に簡単に分解することができる。 Furthermore, according to the first embodiment, the following effects can be obtained. Since the contact portions 7 (see the left side of FIG. 8) shown in the seal structure of the reference example are not required for the boxes 3 and 11, a labor for adding the contact portions 7 to the boxes 3 and 11 is not required. Moreover, since there is nothing other than the sealing material 21 between the sealing surfaces, it can be easily disassembled into two box bodies 3 and 11 simply by cutting the sealing material 21 directly.

第１実施形態によれば、箱体（被シール体）は２つであり、各箱体３、１１は、各箱体３、１１の外周を囲うフランジ部４、１２、各フランジ部４、１２に設けた複数（少なくとも２つ）のボルト孔５、１３を有し、段付きボルト２５は、頭部２６、軸部２７、軸部２７に形成される雄ねじ部２８、軸部先端２７ａと頭部２６との間に形成され、外径が頭部２６の外径より小さくかつ雄ねじ部２８の外径より大きい大径部２９を有し、２つのフランジ部４、１２の間にシール材２１を挟むと共に、上部フランジ部４（頭部側にある第１の被シール体の有するフランジ部）と、下部フランジ部１２（頭部と反対側にある第２の被シール体の有するフランジ部）との同じ位置に設けたボルト孔５、１３に段付きボルト２５を挿通して２つの箱体３、１１を締結することにより凹部６、１４に密閉空間１５を形成する場合に、頭部２６の下面２６ａ（軸側の面）に上部フランジ部４の上面４ｂ（頭部側の面）が接触していないとき、大気圧を超える圧力（またはリークテスト圧）の空気（ガス）を密閉空間１５に供給することにより２つの箱体３、１１同士に離間させる方向に力を与え、頭部２６の下面２６ａ（軸側の面）に上部フランジ部４の上面４ｂを接触させるので、凹部６、１４に密閉空間１５を形成する場合に、段付きボルト２５の締結を完了した段階で頭部２６の下面２６ａに上部フランジ部４の上面４ｂが接触していないときであっても、規定のシール面間寸法を得ることができる。 According to the first embodiment, there are two box bodies (sealed bodies), and each box body 3, 11 has a flange portion 4, 12 that surrounds the outer periphery of each box body 3, 11, each flange portion 4, 12 has a plurality of (at least two) bolt holes 5 and 13, and a stepped bolt 25 includes a head portion 26, a shaft portion 27, a male screw portion 28 formed on the shaft portion 27, a shaft portion tip 27 a A sealing material is formed between the two flange portions 4 and 12, and has a large diameter portion 29 formed between the head portion 26 and having an outer diameter smaller than the outer diameter of the head portion 26 and larger than the outer diameter of the male screw portion 28. 21, the upper flange portion 4 (the flange portion of the first sealed body on the head side) and the lower flange portion 12 (the flange portion of the second sealed body on the side opposite to the head portion) ) And the two bolts 3 by inserting the stepped bolts 25 into the bolt holes 5 and 13 provided at the same position as When the sealed space 15 is formed in the recesses 6 and 14 by fastening 11, the upper surface 4 b (the head side surface) of the upper flange portion 4 contacts the lower surface 26 a (the shaft side surface) of the head 26. When the air pressure is higher than the atmospheric pressure (or leak test pressure), air (gas) is supplied to the sealed space 15 to apply force in the direction of separating the two boxes 3 and 11 from each other. Since the upper surface 4b of the upper flange portion 4 is brought into contact with the lower surface 26a (surface on the shaft side), when the sealed space 15 is formed in the concave portions 6 and 14, the fastening of the stepped bolt 25 is completed at the stage where the fastening of the stepped bolt 25 is completed. Even when the upper surface 4b of the upper flange portion 4 is not in contact with the lower surface 26a, it is possible to obtain a predetermined dimension between the seal surfaces.

第１実施形態によれば、シール面間寸法は、大径部２９の軸方向長さＬから上部フランジ部４（第１の被シール体）の厚さＤを除くことで決定されるので、大径部２９の軸方向長さＬ及び上部フランジ部４の厚さＤによってシール面間寸法を任意に設定できる。 According to the first embodiment, the dimension between the sealing surfaces is determined by removing the thickness D of the upper flange portion 4 (first sealed body) from the axial length L of the large diameter portion 29. The dimension between the seal faces can be arbitrarily set by the axial length L of the large diameter portion 29 and the thickness D of the upper flange portion 4.

第１実施形態によれば、２つの被シール体は電池パック外装体２を構成する２つの箱体３、１１であり、２つの各箱体３、１１は、各箱体３、１１の外周を囲うフランジ部４、１２、各フランジ部４、１２に設けた複数（少なくとも２つ）のボルト孔５、１３を有し、かつ２つの箱体３、１１（の少なくとも一方）の中央に凹部６、１４を有し、２つのフランジ部３、１２間にフランジ部３、１２の周方向に沿ってシール材２１を切れ目なく介在させ、各フランジ部４、１２にかつシール材２１の外側に設けたボルト孔５、１３に段付きボルト２５を挿通して２つの箱体３、１１を、凹部６、１４を内側にして締結することにより凹部６、１４に形成される密閉空間１５にラミネート型電池４１を収納するので、箱体３、１１同士を直接接触させないシール構造においても、ラミネート型電池４１を収納しつつ、規定のシール面間寸法を任意に設定することができる。 According to 1st Embodiment, two to-be-sealed bodies are the two box bodies 3 and 11 which comprise the battery pack exterior body 2, and each two box bodies 3 and 11 are the outer periphery of each box bodies 3 and 11 And a plurality of (at least two) bolt holes 5 and 13 provided in each flange portion 4 and 12 and a recess in the center of two box bodies 3 and 11 (at least one of them) 6 and 14, the seal material 21 is interposed between the two flange portions 3 and 12 along the circumferential direction of the flange portions 3 and 12, and the flange portions 4 and 12 are disposed outside the seal material 21. Laminated bolts 5 and 13 are stepped through bolts 25 and 13 and the two boxes 3 and 11 are fastened with the recesses 6 and 14 inside, and then laminated to the sealed space 15 formed in the recesses 6 and 14. since housing the mold battery 41, direct contact with each other box 3,11 Even in the seal structure that does not, while accommodating the laminate type battery 41, it is possible to arbitrarily set the sealing surfaces between the prescribed size.

実施形態では、被シール体同士を接触させないシール構造について説明したが、被シール体同士を接触させられないシール構造に対しても本発明の適用がある。また、被シール体が２つの場合で説明したが、２つの場合に限定されるものでない。 In the embodiment, the seal structure in which the objects to be sealed are not brought into contact with each other has been described. However, the present invention can also be applied to a seal structure in which the objects to be sealed are not brought into contact with each other. Moreover, although the case where the to-be-sealed body was two was demonstrated, it is not limited to two cases.

実施形態では、２つの箱体３、１１の両方に凹部６、１４を有する場合で説明したが、２つの箱体３、１１の少なくとも一方の中央に凹部を有する場合であってもかまわない。 In the embodiment, the case has been described in which both the two boxes 3 and 11 have the recesses 6 and 14, but the case may have a recess at the center of at least one of the two boxes 3 and 11.

図７にはラミネート型電池４１を５つ積層した場合を示したが、積層するラミネート型電池４１の数はこれに限定されるものでない。 Shows a case where the laminated battery 41 to 5 stacked in FIG. 7, the number of laminate type battery 41 to be stacked is not limited thereto.

２電池パック外装体
３上部箱体（被シール体、第１の被シール体）
４上部フランジ部（被シール体、第１の被シール体）
４ａ下面
４ｂ上面
５上部ボルト孔
６凹部
１１下部箱体（被シール体、第２の被シール体）
１２下部フランジ部被シール体、第２の被シール体）
１２ａ上面
１３下部ボルト孔
１４凹部
１５密閉空間
１６加圧空気供給孔
２１シール材
２５段付きボルト
２６頭部
２６ａ下面
２７軸部
２８雄ねじ部
２９大径部
２９ａ下面
３１一般的なボルト
４１ラミネート型電池 2 Battery pack exterior 3 Upper box (sealed body, first sealed body)
4 Upper flange (sealed body, first sealed body)
4a Lower surface 4b Upper surface 5 Upper bolt hole 6 Recessed portion 11 Lower box (sealed body, second sealed body)
12 Lower flange part sealed body, second sealed body)
12a Upper surface 13 Lower bolt hole 14 Recess 15 Sealed space 16 Pressurized air supply hole 21 Sealing material 25 Stepped bolt 26 Head 26a Lower surface 27 Shaft portion 28 Male thread portion 29 Large diameter portion 29a Lower surface 31 General bolt 41 Laminated battery

Claims

In a seal structure between sealed bodies that forms a sealed space by sandwiching a sealing material between seal surfaces, and the sealed bodies are not brought into contact with each other or are not brought into contact with each other,
The sealed bodies are fastened by stepped bolts,
The stepped bolt is formed between the head, the shaft, the male screw formed on the shaft, the tip of the shaft and the head, and the outer diameter is smaller than the outer diameter of the head and the outer diameter of the male screw. Has a larger diameter part ,
The male screw portion is screwed into a female screw portion formed in one sealed body of the sealed bodies, and the step large diameter portion is inserted into a through hole formed in the other sealed body. And
A seal structure characterized in that a dimension between seal surfaces is set by a gas pressure exceeding an atmospheric pressure supplied to the large- diameter portion of the stepped bolt for fastening the objects to be sealed and the sealed space.

Wherein the sealed body is two, each of the sealing body has a flange portion surrounding the outer periphery of the seal body, or One has two at least one recess in the center of the seal body,
The two sealed bodies include a flange portion of one sealed body on the head side and a flange portion of the other sealed body on the opposite side of the head ,
The sealed space, the external thread portion is screwed into the female screw portion provided in the flange portion having the one of the seal body in said head side, and the other of the seal body on the opposite side of the head wherein in the through hole provided in the flange portion having a state in which the large diameter portion is inserted, said a two spaces formed in the recess by which the sealing body is fastened through the sealing material,
And the head-side surface of the flange portion having the axial side surface and the one of the seal member of said head, said two sealed objects with each other spaced apart by the pressure of the gas supplied to the enclosed space By contacting,
The seal structure according to claim 1.

The seal structure according to claim 2, wherein the dimension between the seal faces is determined by excluding the thickness of the one sealed body.

The two sealed bodies are two boxes constituting the battery pack outer body,
Each box of two, has a flange portion surrounding the outer periphery of each box body has a recess in at least one of the central or One two box body,
The sealing material is provided between the two flange portions without any break along the circumferential direction of the flange portion,
The sealed space includes a flange of the other box on the opposite side of the head, and the male screw is screwed into the female screw provided on the flange of the one box on the head side. wherein in the through hole formed in part in a state where the large diameter portion is inserted through the sealing member, the two box member is formed in the recess by being fastened to the recess in the inner space Because
A laminated battery is stored in the sealed space.
The seal structure according to claim 2.