JP2018060880A - Explosion-proof and waterproof case - Google Patents
Explosion-proof and waterproof case Download PDFInfo
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- JP2018060880A JP2018060880A JP2016196252A JP2016196252A JP2018060880A JP 2018060880 A JP2018060880 A JP 2018060880A JP 2016196252 A JP2016196252 A JP 2016196252A JP 2016196252 A JP2016196252 A JP 2016196252A JP 2018060880 A JP2018060880 A JP 2018060880A
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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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
Description
本発明の実施形態は、防爆防水ケースに関する。 Embodiments described herein relate generally to an explosion-proof waterproof case.
バッテリケースなどの、大型薄肉軽量の防水ケースには、防水ケースの内圧上昇による破裂防止のための安全装置が装着されている。一般的な安全装置としては、圧力リリーフバルブやラプチャディスクがある。ただし、これらは、圧力を受ける部分がケースに対して小型であるため、ある程度の圧力がないと、安全装置として動作しない。 A large, thin, lightweight waterproof case such as a battery case is equipped with a safety device for preventing explosion due to an increase in internal pressure of the waterproof case. Common safety devices include pressure relief valves and rupture disks. However, since the part which receives a pressure is small with respect to a case, if there is no pressure to some extent, it will not operate | move as a safety device.
耐圧の低い気密ケースの場合、圧力リリーフバルブのばね力は極端に小さく、またラプチャディスクの膜厚は、極端に薄くなる。そのため、使用中の圧力以外の外乱（例えば、振動、衝撃などの加速度、砂塵などの飛来物）や、経年劣化（腐食や、紫外線などによる材質劣化）によって、耐えなければならない圧力以下で、圧力リリーフして、防水性が失われることが懸念される。 In an airtight case with a low pressure resistance, the spring force of the pressure relief valve is extremely small, and the film thickness of the rupture disk is extremely thin. For this reason, the pressure is less than the pressure that must be withstood by disturbances other than the pressure in use (for example, acceleration such as vibration and shock, flying objects such as dust) and aging (corrosion and material deterioration due to ultraviolet rays). There is a concern that the waterproofness will be lost due to relief.
一方で、耐圧の低い防水ケースでは、内外気圧差によるケースの損傷や、リークを防止するため、防水呼吸フィルタ（例えば、多孔質ＰＴＦＥ膜）を用いることが多い。ただし、この防水呼吸フィルタは、気体透過速度に限界がある（気体透過に伴う圧力損失が高い）。上記耐圧の低い気密ケースの場合と同様、フィルタは小型なものが多く、フィルタ自体の破裂圧力は、ケース耐圧に比べて高いことが多い。そのため、ケースの内部気体の急激な体積変化には、対応できず、限界を超えると、ケースが耐圧を超えて破裂してしまう可能性がある。 On the other hand, in a waterproof case with a low pressure resistance, a waterproof breathing filter (for example, a porous PTFE membrane) is often used in order to prevent damage to the case due to a difference in internal and external atmospheric pressure or leakage. However, this waterproof breathing filter has a limited gas transmission rate (high pressure loss due to gas transmission). As in the case of the airtight case having a low pressure resistance, the filter is often small, and the burst pressure of the filter itself is often higher than the case pressure resistance. Therefore, it cannot cope with a sudden volume change of the internal gas of the case, and if the limit is exceeded, the case may burst beyond the pressure resistance.
また、小型の呼吸栓が何らかの事情、例えば、砂塵による目詰まり、氷結、油による汚損などにより、外部をふさがれてしまうこともある。その時も同様に、呼吸できずケース耐圧を超えてしまうことがある。 In addition, a small respiratory plug may be blocked from the outside due to some reason, for example, clogging due to dust, icing, or contamination due to oil. Similarly, at that time, the patient may not be able to breathe and may exceed the case pressure resistance.
本実施形態は、耐圧の低い防水ケースの非常時に発生する急激な内部体積の膨張時における、ケースの破裂を防止することができる防爆防水ケースを提供することが課題である。 An object of the present embodiment is to provide an explosion-proof waterproof case that can prevent the case from bursting when the waterproof case with low pressure resistance is suddenly expanded in the event of an emergency.
実施形態の防爆防水ケースは、下ケースと、上ケースと、ケース嵌合部と、ねじ固定部と、２段の圧力リリーフ部とを有し、下ケースは、上面開口部が形成された矩形箱形である。
上ケースは、下面開口部が形成された矩形箱形である。ケース嵌合部は、前記下ケースの前記上面開口部の周壁部と、前記上ケースの前記下面開口部の周壁部との少なくともいずれか一方に嵌合凹部、他方に嵌合凸部がそれぞれ形成され、前記嵌合凸部と前記嵌合凹部とが嵌合可能に接合された状態で前記下ケースと前記上ケースとの間が密閉される。ねじ固定部は、前記ケース嵌合部の各角部に設けられ、前記上ケースと前記下ケースとをねじ固定する。２段の圧力リリーフ部は、前記上ケースと前記下ケースとを接合させたケース本体に設けられ、前記ケース本体の内部圧力を解放する作動圧力が異なる。低圧側の前記圧力リリーフ部は、前記ケース本体の内部の防水性を保持しながら、前記ケース本体の内外気を通気させる防水通気フィルタによって形成される。高圧側の前記圧力リリーフ部は、安全解放部である。安全解放部は、前記ケース本体の角部間の壁面腹部に設けられ、前記ケース本体の内部で前記防水通気フィルタの気体透過許容量を上回る前記ケース本体の内部の急激な体積膨張があった場合に前記ケース本体の一部を安全に解放して、前記ケース本体の爆発を防止する。
The explosion-proof waterproof case of the embodiment has a lower case, an upper case, a case fitting portion, a screw fixing portion, and a two-stage pressure relief portion, and the lower case is a rectangle in which an upper surface opening is formed. Box shape.
The upper case has a rectangular box shape with a lower surface opening. The case fitting portion is formed with a fitting concave portion on at least one of a peripheral wall portion of the upper surface opening portion of the lower case and a peripheral wall portion of the lower surface opening portion of the upper case, and a fitting convex portion on the other side. Then, the lower case and the upper case are sealed in a state where the fitting convex portion and the fitting concave portion are joined so as to be fitted. The screw fixing portion is provided at each corner of the case fitting portion, and fixes the upper case and the lower case with screws. The two-stage pressure relief portion is provided in a case main body where the upper case and the lower case are joined, and the operating pressure for releasing the internal pressure of the case main body is different. The pressure relief portion on the low-pressure side is formed by a waterproof ventilation filter that vents the inside and outside air of the case body while maintaining waterproofness inside the case body. The pressure relief part on the high pressure side is a safety release part. The safety release portion is provided at a wall surface between the corners of the case body, and there is a rapid volume expansion inside the case body that exceeds a gas permissible amount of the waterproof ventilation filter inside the case body. A part of the case body is safely released to prevent explosion of the case body.
図１乃至図５Ｂは、第１の実施形態を示す。図１は、防爆防水ケースの一例である二次電池のバッテリケース１の全体の概略構成を示す斜視図である。図２は、図１のバッテリケース１の分解斜視図である。図３は、バッテリケース１の上ケース２と下ケース３とのケース嵌合部４を示す要部の縦断面図である。図４は、バッテリケース１のケース本体１０の内部に作用する圧力をケース本体の上から見た状態で概略的に示す図である。 1 to 5B show a first embodiment. FIG. 1 is a perspective view showing an overall schematic configuration of a battery case 1 of a secondary battery which is an example of an explosion-proof waterproof case. FIG. 2 is an exploded perspective view of the battery case 1 of FIG. FIG. 3 is a longitudinal sectional view of a main part showing a case fitting portion 4 between the upper case 2 and the lower case 3 of the battery case 1. FIG. 4 is a diagram schematically showing the pressure acting on the inside of the case body 10 of the battery case 1 as seen from above the case body.
本実施形態のバッテリケース１は、上ケース２と、下ケース３と、ケース嵌合部４と、ねじ固定部５と、後述する２段の圧力リリーフ部６、７とを有する。図２に示すように下ケース３は、上面開口部３ａが形成された矩形箱形の筺体である。この下ケース３は、矩形平板状の底板３ｂと、前後左右の４面の側壁部３ｃ、３ｄ、３ｅ、３ｆとを有する。下ケース３の内部には、図示しない複数の電池セルが並設された組電池と、この組電池の上面側に配置された基板、バスバ、その他の構造材などが収容されている。電池セルは、セル缶（またはラミネート膜）などに収容されている。 The battery case 1 of the present embodiment includes an upper case 2, a lower case 3, a case fitting portion 4, a screw fixing portion 5, and two-stage pressure relief portions 6 and 7, which will be described later. As shown in FIG. 2, the lower case 3 is a rectangular box-shaped housing in which an upper surface opening 3a is formed. The lower case 3 has a rectangular flat plate-like bottom plate 3b and four side walls 3c, 3d, 3e, and 3f on the front, rear, left and right sides. The lower case 3 accommodates an assembled battery in which a plurality of battery cells (not shown) are arranged side by side, and a substrate, a bus bar, and other structural materials arranged on the upper surface side of the assembled battery. The battery cell is accommodated in a cell can (or laminate film) or the like.
上ケース２は、下面開口部２ａ（図３参照）が形成された矩形箱形の筺体である。この上ケース２は、上面板２ｂと、前後左右の４面の側壁部２ｃ、２ｄ、２ｅ、２ｆとを有する。上ケース２には、上面に正極端子８と、負極端子９と、低圧側の圧力リリーフ部６などが設けられている。正極端子８は、図示しない組電池の正極タブに接続されている。負極端子９は、図示しない組電池の負極タブに接続されている。 The upper case 2 is a rectangular box-shaped housing in which a lower surface opening 2a (see FIG. 3) is formed. The upper case 2 has an upper surface plate 2b and four side walls 2c, 2d, 2e, and 2f on the front, rear, left and right sides. The upper case 2 is provided with a positive electrode terminal 8, a negative electrode terminal 9, a low-pressure pressure relief portion 6, and the like on the upper surface. The positive electrode terminal 8 is connected to a positive electrode tab of a battery pack (not shown). The negative electrode terminal 9 is connected to a negative electrode tab of a battery pack (not shown).
２段の圧力リリーフ部６、７は、上ケース２と下ケース３とを接合させたケース本体１０に設けられている。２段の圧力リリーフ部６、７は、ケース本体１０の内圧上昇による破裂防止のための安全装置であり、内部圧力を解放する作動圧力が異なる。すなわち、一方の圧力リリーフ部６は、作動圧力が小さい低圧側の安全装置（低圧側圧力リリーフ部６）である。他方の圧力リリーフ部７は、作動圧力が大きい高圧側の安全装置（高圧側圧力リリーフ部７）である。 The two-stage pressure relief portions 6 and 7 are provided in the case main body 10 in which the upper case 2 and the lower case 3 are joined. The two-stage pressure relief portions 6 and 7 are safety devices for preventing bursting due to an increase in the internal pressure of the case body 10, and have different operating pressures for releasing the internal pressure. That is, one pressure relief portion 6 is a low-pressure side safety device (low-pressure side pressure relief portion 6) having a small operating pressure. The other pressure relief portion 7 is a high pressure side safety device (high pressure side pressure relief portion 7) having a large operating pressure.
本実施形態では、下ケース３の上端部（上面開口部３ａ側の端部）と、上ケース２の下端部（下面開口部２ａ側の端部）との当接部には、ケース嵌合部４が形成されている。ここで、下ケース３の上面開口部３ａの周壁部には、嵌合凸部４ａが形成されている。この嵌合凸部４ａは、下ケース３の上面開口部３ａ側の上端部の周壁部に他の部分よりも内側に陥没させた切欠部（段部）を設けることで、下ケース３の上端部の周壁部に他の部分よりも外形が小さい矩形枠状の上向きの凸部を形成したものである。 In the present embodiment, a case fitting is provided at the contact portion between the upper end portion of the lower case 3 (end portion on the upper surface opening portion 3a side) and the lower end portion of the upper case 2 (end portion on the lower surface opening portion 2a side). Part 4 is formed. Here, the fitting convex part 4a is formed in the surrounding wall part of the upper surface opening part 3a of the lower case 3. As shown in FIG. This fitting convex part 4a provides the upper end of the lower case 3 by providing a notch part (step part) recessed inward from the other part on the peripheral wall part of the upper end part on the upper surface opening part 3a side of the lower case 3. An upward convex portion having a rectangular frame shape whose outer shape is smaller than that of other portions is formed on the peripheral wall portion of the portion.
また、上ケース２の下面開口部２ａの周壁部には、下ケース３の嵌合凸部４ａと嵌合可能な嵌合凹部４ｂが形成されている。この嵌合凹部４ｂは、上ケース２の下端部の周壁部内周面に矩形枠状の凹部を形成したものである。そして、ケース嵌合部４は、下ケース３の嵌合凸部４ａと、上ケース２の嵌合凹部４ｂとを嵌合させた部分である。なお、ケース嵌合部４は、下ケース３に嵌合凹部４ｂを形成し、上ケース２に嵌合凸部４ａを形成してもよい。 Further, a fitting recess 4 b that can be fitted to the fitting projection 4 a of the lower case 3 is formed in the peripheral wall portion of the lower surface opening 2 a of the upper case 2. The fitting recess 4 b is formed by forming a rectangular frame-shaped recess on the inner peripheral surface of the peripheral wall at the lower end of the upper case 2. The case fitting portion 4 is a portion in which the fitting convex portion 4a of the lower case 3 and the fitting concave portion 4b of the upper case 2 are fitted. In addition, the case fitting part 4 may form the fitting recessed part 4b in the lower case 3, and may form the fitting convex part 4a in the upper case 2.
図３に示すように下ケース３の嵌合凸部４ａの壁部と、上ケース２の嵌合凹部４ｂの壁部との間には、パッキンを装着可能な溜まり部であるパッキン装着部１１が形成されている。このパッキン装着部１１には、例えば、液状パッキンのような気密性を保つパッキン１２が装着されている。この液状パッキンは、塗布時は、流動性のあるゴム状のものであり、パッキン装着部１１に塗布したのちに、硬化して、ゴム状となり、パッキン装着部１１の壁面に密着し、気密を保つ。これにより、嵌合凸部４ａと嵌合凹部４ｂとが嵌合可能に接合された状態で下ケース３と上ケース２との間がパッキン１２によって密閉される。さらに、パッキン１２は、ゴム状なので、パッキン装着部１１の壁面の変形にも、ある程度は、弾性変形して追随し、気密を維持する。 As shown in FIG. 3, a packing mounting portion 11, which is a reservoir portion in which packing can be mounted, is provided between the wall portion of the fitting convex portion 4 a of the lower case 3 and the wall portion of the fitting concave portion 4 b of the upper case 2. Is formed. For example, a packing 12 that maintains airtightness such as a liquid packing is mounted on the packing mounting portion 11. This liquid packing is a fluid rubber-like material at the time of application, and after being applied to the packing mounting part 11, it hardens to become rubbery and adheres closely to the wall surface of the packing mounting part 11, thereby ensuring airtightness. keep. Accordingly, the packing 12 seals the space between the lower case 3 and the upper case 2 in a state where the fitting convex portion 4a and the fitting concave portion 4b are joined so as to be fitted. Furthermore, since the packing 12 is rubber-like, the deformation of the wall surface of the packing mounting portion 11 is also elastically deformed to some extent to keep it airtight.
また、ケース本体１０には、上ケース２と下ケース３との接合部の例えば２か所に取っ手部１６が設けられている。ここで、上ケース２には、例えば、２面の側壁部２ｅ、２ｆに外向きに延出された取っ手部用の突起部１７（図１では側壁部２ｆ側の突起部１７のみを示す）が形成されている。同様に、下ケース３には、例えば、２面の側壁部３ｅ、３ｆに外向きに延出された突起部１８（図１では側壁部３ｆ側の突起部１８のみを示す）が形成されている。そして、上ケース２と下ケース３との接合時には、上ケース２の突起部１７と下ケース３の突起部１８とが同時に接合されるようになっている。 In addition, the case body 10 is provided with handle portions 16 at, for example, two places in the joint portion between the upper case 2 and the lower case 3. Here, the upper case 2 has, for example, a handle projection 17 extending outwardly on the two side walls 2e and 2f (only the projection 17 on the side wall 2f side is shown in FIG. 1). Is formed. Similarly, the lower case 3 is formed with, for example, a protruding portion 18 (only the protruding portion 18 on the side wall 3f side is shown in FIG. 1) extending outwardly on the two side wall portions 3e and 3f. Yes. When the upper case 2 and the lower case 3 are joined, the protrusion 17 of the upper case 2 and the protrusion 18 of the lower case 3 are joined at the same time.
ねじ固定部５は、ケース嵌合部４の各角部（４か所）および取っ手部１６に設けられている。ここで、下ケース３の上端部周壁部には、嵌合凸部４ａの付け根部分の段部平面にねじ穴１３が形成されている。上ケース２には、下ケース３のねじ穴１３と対応する部位にねじ挿通孔１４が形成されている。そして、上ケース２の上側から固定ねじ１５が上ケース２のねじ挿通孔１４に挿入され、このねじ挿通孔１４を通して固定ねじ１５が下ケース３のねじ穴１３に螺挿されて固定される。これにより、上ケース２と下ケース３とをねじ固定する。 The screw fixing portion 5 is provided at each corner (four places) and the handle portion 16 of the case fitting portion 4. Here, a screw hole 13 is formed in the stepped plane of the base portion of the fitting convex portion 4 a in the upper peripheral wall portion of the lower case 3. A screw insertion hole 14 is formed in the upper case 2 at a portion corresponding to the screw hole 13 of the lower case 3. A fixing screw 15 is inserted into the screw insertion hole 14 of the upper case 2 from above the upper case 2, and the fixing screw 15 is screwed into the screw hole 13 of the lower case 3 through the screw insertion hole 14 and fixed. Thereby, the upper case 2 and the lower case 3 are fixed by screws.
取っ手部１６には、上ケース２の突起部１７と下ケース３の突起部１８との間に貫通するねじ挿通孔が形成されている。そして、このるねじ挿通孔に挿入される固定ねじによって上ケース２の突起部１７と下ケース３の突起部１８との間をねじ固定する。 The handle portion 16 is formed with a screw insertion hole penetrating between the protrusion portion 17 of the upper case 2 and the protrusion portion 18 of the lower case 3. Then, a screw is fixed between the protrusion 17 of the upper case 2 and the protrusion 18 of the lower case 3 with a fixing screw inserted into the screw insertion hole.
また、低圧側圧力リリーフ部６は、ケース本体１０の内部の防水性を保持しながら、ケース本体１０の内外気を通気させる防水通気フィルタによって形成される。この防水通気フィルタは、例えば、多孔質ＰＴＦＥ膜をもつ。そして、低圧側圧力リリーフ部６は、周囲大気の気圧変化や、温度上昇などによるケース本体１０の内部圧力の変化に対しては、防水性を保持しながら、内外気を通気させて（入れ替えて）、ケース本体１０に内外気圧差をかけない構造になっている。 Further, the low pressure side pressure relief portion 6 is formed by a waterproof ventilation filter that vents the inside and outside air of the case body 10 while maintaining the waterproofness inside the case body 10. This waterproof ventilation filter has, for example, a porous PTFE membrane. And the low pressure side pressure relief part 6 ventilates the inside and outside air while keeping waterproofness against the atmospheric pressure change of the surrounding atmosphere or the change of the internal pressure of the case body 10 due to the temperature rise or the like (replace it). ), And the case main body 10 has a structure that does not apply an internal / external air pressure difference.
高圧側圧力リリーフ部７は、ケースベント部による安全解放部である。図４に示すようにこの安全解放部は、ケース本体１０の４か所の角部１０ａ間の壁面腹部１０ｂに設けられている。この高圧側圧力リリーフ部７は、ケース本体１０の内部で低圧側圧力リリーフ部６の防水通気フィルタの気体透過許容量を上回るケース本体１０の内部の急激な体積膨張があった場合にケース本体１０の一部を安全に解放して、ケース本体１０の爆発を防止する。本実施形態では、ケース本体１０の壁面腹部１０ｂの引張変形に応じてパッキン装着部１１のパッキン１２を破壊してケース本体１０の内部圧力を解放する。 The high pressure side pressure relief part 7 is a safety release part by a case vent part. As shown in FIG. 4, the safety release portion is provided on the wall surface abdomen 10 b between the four corners 10 a of the case body 10. The high pressure side pressure relief portion 7 is formed in the case main body 10 when there is a sudden volume expansion inside the case main body 10 that exceeds the allowable gas permeation amount of the waterproof ventilation filter of the low pressure side pressure relief portion 6 inside the case main body 10. Is safely released to prevent the case body 10 from exploding. In the present embodiment, the internal pressure of the case main body 10 is released by destroying the packing 12 of the packing mounting portion 11 according to the tensile deformation of the wall surface abdomen 10b of the case main body 10.
次に、上記構成の本実施形態のバッテリケース１の作用について説明する。本実施形態のバッテリケース１の使用時には、通常時には低圧側圧力リリーフ部６の防水通気フィルタによってケース本体１０の内部の防水性を保持しながら、ケース本体１０の内外気を通気させている。さらに、パッキン装着部１１のパッキン１２は、塗布時は、流動性のあるゴム状の液状パッキンであり、パッキン装着部１１に塗布したのちに、硬化して、ゴム状となる。そのため、パッキン装着部１１の壁面に密着し、気密を保つ。またゴム状なので、壁面の変形にも、ある程度は、弾性変形して追随し気密を維持する。これにより、通常時のバッテリケース１の内圧上昇による破裂防止が行われている。 Next, the operation of the battery case 1 of the present embodiment having the above configuration will be described. When the battery case 1 of the present embodiment is used, the inside and outside air of the case body 10 is ventilated while the waterproofness of the inside of the case body 10 is maintained by the waterproof ventilation filter of the low pressure side pressure relief portion 6 in the normal state. Further, the packing 12 of the packing mounting portion 11 is a fluid rubber-like liquid packing at the time of application, and after being applied to the packing mounting portion 11, it is cured to become a rubber shape. Therefore, it adheres to the wall surface of the packing mounting part 11, and keeps airtightness. Moreover, since it is rubbery, it is elastically deformed to some extent even when the wall surface is deformed, and maintains airtightness. Thereby, the burst prevention by the internal pressure rise of the battery case 1 at the normal time is performed.
また、バッテリケース１の内部気体の急激な体積変化時（低圧側圧力リリーフ部６の防水通気フィルタの気体透過許容量（速度）を上回るケース本体１０の内部の急激な体積膨張時）には、例えば図４中に矢印で示すようにバッテリケース１の中心点Ｏからケース本体１０の外向きに大きな押圧力が作用する。この押圧力により、ケース本体１０の４壁面に図４中に仮想線で示すように引張変形が発生する。このケース本体１０の引張変形は、ケース本体１０の４か所の角部１０ａ間の壁面腹部１０ｂの部分の変形量が大きい。そして、この壁面腹部１０ｂの部分から角部１０ａに接近するにつれて、引張変形の比率は減り、曲げ変形の比率が増える。 Further, at the time of sudden volume change of the internal gas of the battery case 1 (at the time of rapid volume expansion inside the case body 10 exceeding the allowable gas permeation amount (speed) of the waterproof ventilation filter of the low pressure side pressure relief portion 6), For example, as shown by an arrow in FIG. 4, a large pressing force is applied outward from the center point O of the battery case 1 to the case body 10. Due to this pressing force, tensile deformation occurs on the four wall surfaces of the case body 10 as indicated by phantom lines in FIG. The tensile deformation of the case main body 10 has a large amount of deformation in the portion of the wall surface abdomen 10b between the four corners 10a of the case main body 10. As the wall surface portion 10b approaches the corner portion 10a, the tensile deformation ratio decreases and the bending deformation ratio increases.
したがって、図４中に仮想線で示す引張変形の発生時には、壁面腹部１０ｂの部分の変形により、図５Ａに示すように下ケース３の嵌合凸部４ａの壁部と、上ケース２の嵌合凹部４ｂの壁部との間の壁面同士が、“剪断方向（すべり方向）の変形”をする。このすべり方向の変形時には、図５Ｂに示すようにパッキン装着部１１のパッキン１２がせん断破壊を起こす。このせん断破壊を起こす部分は、通常は、ケース本体１０の４か所の角部１０ａ間の壁面腹部１０ｂのいずれか１か所である。そして、このパッキン１２がせん断破壊を起こした部分からケース本体１０の内部のガスが急速に流出することで、ケース本体１０の内部圧力を解放する。さらに、４か所の角部１０ａ間の壁面腹部１０ｂのうちのどこか１か所の安全解放部（パッキン１２のせん断破壊部分）から内圧が解放されれば、残りの壁面腹部１０ｂでは変形が止まる。 Therefore, when the tensile deformation shown by the phantom line in FIG. 4 occurs, the wall portion of the fitting portion 4a of the lower case 3 and the fitting of the upper case 2 as shown in FIG. Wall surfaces between the wall portions of the combined recesses 4b perform “deformation in the shearing direction (slip direction)”. At the time of deformation in this sliding direction, the packing 12 of the packing mounting portion 11 undergoes shear failure as shown in FIG. 5B. The portion causing the shear fracture is usually one of the wall surface abdominal portions 10b between the four corner portions 10a of the case main body 10. And the gas inside case body 10 flows out rapidly from the part which this packing 12 raise | generated shear failure, and the internal pressure of case body 10 is released. Further, if the internal pressure is released from one of the safety release portions (shear fracture portion of the packing 12) of the wall surface abdomen 10b between the four corners 10a, the remaining wall surface abdomen 10b is deformed. Stop.
なお、ケース本体１０の４か所の角部１０ａの部分は、引張変形が少ないため、パッキン１２の破損は同時には起きない。つまりパッキン装着部１１のパッキン１２が同時に破損して、ケース本体１０の一部が吹き飛ぶという可能性は低い。また、通常、ケース本体１０の４か所の角部１０ａには、ねじ固定部５があるので、このねじ固定部５によってパッキン１２の破損は防止される。そのため、ケース本体１０の４か所の角部１０ａでケース本体１０が破裂するという可能性はほとんどない。 Note that the four corner portions 10a of the case main body 10 are less subject to tensile deformation, so that the packing 12 is not damaged at the same time. That is, there is a low possibility that the packing 12 of the packing mounting portion 11 is damaged at the same time and a part of the case body 10 is blown away. In addition, since the screw fixing portions 5 are usually provided at the four corners 10 a of the case body 10, the packing 12 is prevented from being damaged by the screw fixing portions 5. Therefore, there is almost no possibility that the case body 10 will burst at the four corners 10 a of the case body 10.
また、図６Ａ，図６Ｂは、第１の実施形態のバッテリケース１の安全解放部の比較例を示す。ここでは、図６Ａに示すように下ケース３と、上ケース２との端面同士が突き当てられた部分にパッキン１２が装着されている。この場合は、ケース本体１０の内部の急激な体積膨張時には、図６Ａ中に矢印で示すようにパッキン１２に引張変形の引張力が作用する。そのため、ケース本体１０の引張変形の引張力と同方向の引張力がパッキン１２に作用するので、パッキン１２には大きな引張力が作用することになる。したがって、この場合は急激なパッキン１２の亀裂、破壊が発生するので、図６Ｂに示すようにこのパッキン１２の破壊部分から大量の内部気体の放出が起こり、ケース本体１０が破裂する。 Moreover, FIG. 6A and FIG. 6B show the comparative example of the safety release part of the battery case 1 of 1st Embodiment. Here, as shown in FIG. 6A, the packing 12 is attached to a portion where the end surfaces of the lower case 3 and the upper case 2 are abutted. In this case, at the time of rapid volume expansion inside the case body 10, a tensile force of tensile deformation acts on the packing 12 as shown by an arrow in FIG. 6A. Therefore, a tensile force in the same direction as the tensile force of the tensile deformation of the case body 10 acts on the packing 12, so that a large tensile force acts on the packing 12. Therefore, in this case, since the crack and destruction of the packing 12 occur suddenly, a large amount of internal gas is released from the broken portion of the packing 12 as shown in FIG. 6B, and the case body 10 is ruptured.
そこで、上記構成の本実施形態のバッテリケース１では、低圧側圧力リリーフ部６の防水通気フィルタの気体透過許容量（速度）を上回る内部の急激な体積膨張があった場合には、高圧側圧力リリーフ部７によりケース本体１０の一部を安全に解放して、ケース本体１０の爆発を防止することができる。これは、低圧側圧力リリーフ部６の防水通気フィルタが故障（詰まる）場合にも動作して、ケース本体１０の破裂を防止することができる。したがって、耐圧の低い防水ケースの非常時に発生する急激な内部体積の膨張時における、ケース本体１０の破裂を防止することができる防爆防水ケースを提供することができる。 Therefore, in the battery case 1 of the present embodiment having the above-described configuration, when there is an abrupt volume expansion inside that exceeds the gas permeation allowance (speed) of the waterproof ventilation filter of the low-pressure side pressure relief portion 6, the high-pressure side pressure The relief portion 7 can safely release a part of the case body 10 to prevent the case body 10 from exploding. This operates even when the waterproof ventilation filter of the low pressure side pressure relief portion 6 is broken (clogged), and can prevent the case body 10 from bursting. Therefore, it is possible to provide an explosion-proof waterproof case that can prevent the case body 10 from being ruptured when the waterproof case with low pressure resistance is suddenly expanded due to an emergency.
図７は、第１の実施形態のバッテリケース１の高圧側圧力リリーフ部７の安全解放部の第１の変形例を示す要部の縦断面図である。本変形例は、４か所の角部１０ａ間の壁面腹部１０ｂのいずれか１か所、ここでは上ケース２の４面の側壁部２ｃ、２ｄ、２ｅ、２ｆのうちの１面の側壁部２ｃに壁厚を他の部分よりも小さくした薄肉部２ｃ１を設けている。この薄肉部２ｃ１は、上ケース２の他の３面の側壁部２ｄ、２ｅ、２ｆには設けられていない。 FIG. 7 is a longitudinal cross-sectional view of a main part showing a first modification of the safety release portion of the high-pressure pressure relief portion 7 of the battery case 1 of the first embodiment. In this modification, any one of the wall surface portions 10b between the four corner portions 10a, here, one of the four side wall portions 2c, 2d, 2e, and 2f of the upper case 2 is provided. A thin portion 2c1 having a wall thickness smaller than that of other portions is provided on 2c. The thin portion 2c1 is not provided on the other three side wall portions 2d, 2e, and 2f of the upper case 2.
同様に、下ケース３の４面の側壁部３ｃ、３ｄ、３ｅ、３ｆのうちの１面の側壁部３ｃに壁厚を他の部分よりも小さくした薄肉部３ｃ１を設けている。この薄肉部３ｃ１は、下ケース３の他の３面の側壁部３ｄ、３ｅ、３ｆには設けられていない。 Similarly, a thin wall portion 3c1 having a wall thickness smaller than that of the other portion is provided on one side wall portion 3c of the four side wall portions 3c, 3d, 3e, and 3f of the lower case 3. The thin portion 3c1 is not provided on the other three side wall portions 3d, 3e, and 3f of the lower case 3.
したがって、本変形例では、ケース本体１０の内部の急激な体積膨張時に、上ケース２の薄肉部２ｃ１の部分と、下ケース３の薄肉部３ｃ１との部分で、ケース本体１０の引張変形の変形量を他の部分よりも大きくすることができる。そのため、これらの上ケース２の薄肉部２ｃ１の部分と、下ケース３の薄肉部３ｃ１と対応する部分（圧力解放位置設定部）で、パッキン１２のせん断破壊を起こすことができ、そこで最初に圧力解放させることができる。これにより、ケース本体１０の内部の急激な体積膨張時に、最初に圧力解放させる箇所を確定させることができるので、ケース本体１０の内部から放出し、周囲に飛散される（しばしば高温で、有害な）気体の方向を特定することができる。 Therefore, in this modification, during the sudden volume expansion inside the case main body 10, the deformation of the tensile deformation of the case main body 10 is caused by the thin portion 2c1 of the upper case 2 and the thin portion 3c1 of the lower case 3. The amount can be larger than the other parts. Therefore, in the portion of the thin portion 2c1 of the upper case 2 and the portion corresponding to the thin portion 3c1 of the lower case 3 (pressure release position setting portion), the shear failure of the packing 12 can be caused. Can be released. As a result, it is possible to determine the location where the pressure is first released at the time of sudden volume expansion inside the case body 10, so that it is released from the inside of the case body 10 and scattered around (often harmful at high temperatures). ) The direction of the gas can be specified.
図８および図９Ａ，図９Ｂは、第１の実施形態のバッテリケース１の高圧側圧力リリーフ部７の安全解放部（圧力解放位置設定部）の第２の変形例の要部を示す。本変形例は、図８に示すようにパッキン装着部１１の壁面の一部を構成する下ケース３の嵌合凸部４ａの壁部の稜線２１の一部に切欠き部２２を設けている。これにより、図９Ａに示すように切欠き部２２の部分にパッキン１２を保持するパッキン装着部１１の面積が他の部分（図９Ｂに示すように切欠き部２２がない部分）よりも小さいパッキン装着部１１の小面積部分１１ａを設けている。 FIGS. 8, 9 </ b> A, and 9 </ b> B illustrate a main part of a second modification of the safety release portion (pressure release position setting portion) of the high-pressure pressure relief portion 7 of the battery case 1 of the first embodiment. In this modification, as shown in FIG. 8, a notch 22 is provided in a part of the ridge line 21 of the wall portion of the fitting convex portion 4 a of the lower case 3 constituting a part of the wall surface of the packing mounting portion 11. . As a result, as shown in FIG. 9A, the packing mounting portion 11 that holds the packing 12 in the portion of the notch 22 has a smaller area than other portions (the portion that does not have the notch 22 as shown in FIG. 9B). A small area portion 11 a of the mounting portion 11 is provided.
したがって、本変形例では、ケース本体１０の内部の急激な体積膨張時に、パッキン装着部１１の小面積部分１１ａによってケース本体１０の引張変形の変形量を他の部分よりも大きくすることができる。そのため、このパッキン装着部１１の小面積部分１１ａで、パッキン１２のせん断破壊を起こすことができ、そこで最初に圧力解放させることができる。これにより、ケース本体１０の内部の急激な体積膨張時に、最初に圧力解放させる箇所を確定させることができるので、ケース本体１０の内部から放出し、周囲に飛散される（しばしば高温で、有害な）気体の方向を特定することができる。 Therefore, in the present modification, the amount of deformation of the tensile deformation of the case body 10 can be made larger than that of the other parts by the small area portion 11a of the packing mounting portion 11 at the time of rapid volume expansion inside the case body 10. Therefore, in the small area portion 11a of the packing mounting portion 11, the packing 12 can be sheared and the pressure can be released first. As a result, it is possible to determine the location where the pressure is first released at the time of sudden volume expansion inside the case body 10, so that it is released from the inside of the case body 10 and scattered around (often harmful at high temperatures). ) The direction of the gas can be specified.
なお、安全解放部の圧力解放位置設定部は、隣接するねじ固定部５の間隔を調整し、この間隔を他の場所よりも大きくした部分を設けてもよい。このようにねじ固定部５の間隔を他の場所よりも大きくした部分では、ケース本体１０の引張変形の変形量を他の部分よりも大きくすることができる。そのため、この場合もねじ固定部５の間隔を他の場所よりも大きくした部分によってケース本体１０の最初に圧力解放させる解放場所を設定することができる。 The pressure release position setting part of the safety release part may be provided with a part that adjusts the interval between the adjacent screw fixing parts 5 and makes this interval larger than other places. As described above, in the portion where the interval between the screw fixing portions 5 is larger than that in other places, the deformation amount of the tensile deformation of the case body 10 can be made larger than that in the other portions. Therefore, also in this case, it is possible to set a release location where the pressure of the case main body 10 is released first by a portion where the interval between the screw fixing portions 5 is larger than the other locations.
図１０Ａ，図１０Ｂは、第１の実施形態のバッテリケース１の安全解放部の第３の変形例を示す。本変形例は、ケース嵌合部４の向きを調整して、解放圧力を操作する構成にしたものである。 10A and 10B show a third modification of the safety release portion of the battery case 1 of the first embodiment. In this modification, the direction of the case fitting part 4 is adjusted to operate the release pressure.
図１０Ａは、ケース本体１０の解放圧力を大きくしたケース嵌合部４の第１の組み合わせを説明するための要部の縦断面図である。また、図１０Ｂは、ケース本体１０の解放圧力を小さくしたケース嵌合部４の第２の組み合わせを説明するための要部の縦断面図である。 FIG. 10A is a longitudinal cross-sectional view of a main part for explaining a first combination of the case fitting portions 4 in which the release pressure of the case main body 10 is increased. FIG. 10B is a longitudinal sectional view of a main part for explaining a second combination of the case fitting portions 4 in which the release pressure of the case body 10 is reduced.
図１０Ａの第１の組み合わせでは、ケース壁面の面積が小さい上ケース２の方に嵌合凹部４ｂが形成され、ケース壁面の面積が大きい下ケース３の方に嵌合凸部４ａが形成されている。この場合は、ケース壁面の面積が小さい上ケース２の方が外側に嵌合しているので、面積の大きな内側に嵌合した下ケース３の嵌合凸部４ａの部分からの大きな荷重によって、ケース本体１０は、内側から押されることになる。これは、パッキン装着部１１に圧縮方向に働く荷重である。そのため、パッキン装着部１１内のパッキン１２は、圧縮荷重を受けながら、剪断変形をするので、開放圧力は高くなる。 In the first combination of FIG. 10A, the fitting recess 4b is formed on the upper case 2 having a smaller case wall area, and the fitting protrusion 4a is formed on the lower case 3 having a larger case wall area. Yes. In this case, since the upper case 2 having a smaller area of the case wall surface is fitted to the outside, a large load from the fitting convex portion 4a of the lower case 3 fitted to the inside having a large area, The case body 10 is pushed from the inside. This is a load acting on the packing mounting portion 11 in the compression direction. Therefore, the packing 12 in the packing mounting portion 11 undergoes shear deformation while receiving a compressive load, so that the opening pressure increases.
一方、図１０Ｂの第２の組み合わせは、ケース壁面の面積が小さい上ケース２の方に嵌合凸部４ａが形成され、ケース壁面の面積が大きい下ケース３の方に嵌合凹部４ｂが形成されている。この場合は、ケース壁面の面積が小さい上ケース２の方が、内側に嵌合している。そのため、面積の大きな外側に嵌合した部分（下ケース３の嵌合凹部４ｂの壁部）に作用する大きな荷重によって、ケース本体１０が内側から押された際に、これを押さえる部分がない。この場合は、パッキン装着部１１内のパッキン１２に引張方向の荷重が作用するので、パッキン１２は、引張荷重を受け、ちぎれそうになりながら、剪断変形をする。そのため、ケース本体１０の解放圧力は小さくなる。 On the other hand, in the second combination of FIG. 10B, the fitting convex part 4a is formed on the upper case 2 having a small case wall area, and the fitting concave part 4b is formed on the lower case 3 having a large case wall area. Has been. In this case, the upper case 2 having a smaller case wall area is fitted to the inside. Therefore, when the case main body 10 is pushed from the inside by a large load acting on a portion fitted on the outside having a large area (a wall portion of the fitting recess 4b of the lower case 3), there is no portion for holding the case main body 10 from the inside. In this case, since a load in the tensile direction acts on the packing 12 in the packing mounting portion 11, the packing 12 undergoes a tensile load and undergoes shear deformation while being likely to tear. Therefore, the release pressure of the case body 10 is reduced.
したがって、本変形例では、ケース嵌合部４の向きを図１０Ａの第１の組み合わせと、図１０Ｂの第２の組み合わせのいずれかを選択することで、ケース本体１０の解放圧力を調整して、解放圧力を操作することができる。 Therefore, in this modification, the release pressure of the case body 10 is adjusted by selecting either the first combination of FIG. 10A or the second combination of FIG. The release pressure can be manipulated.
また、第１の実施形態では、防爆防水ケースの一例として二次電池のバッテリケース１に適用した例を示したが、これに限定されるものではない。例えば、燃料電池のバッテリケースや、燃料タンクなどに適用することも可能である。 Moreover, in 1st Embodiment, although the example applied to the battery case 1 of a secondary battery was shown as an example of an explosion-proof waterproof case, it is not limited to this. For example, the present invention can be applied to a battery case of a fuel cell, a fuel tank, or the like.
これらの実施形態によれば、耐圧の低い防水ケースの非常時に発生する急激な内部体積の膨張時における、ケースの破裂を防止することができる防爆防水ケースを提供することができる。 According to these embodiments, it is possible to provide an explosion-proof waterproof case capable of preventing the case from bursting when the waterproof case having a low pressure resistance is suddenly expanded in an emergency.
本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
１…バッテリケース、２…上ケース、２ａ…下面開口部、２ｂ…上面板、２ｃ…側壁部、２ｃ１…薄肉部、２ｄ…側壁部、２ｅ…側壁部、２ｆ…側壁部、３…下ケース、３ａ…上面開口部、３ｂ…底板、３ｃ…側壁部、３ｃ１…薄肉部、３ｄ…側壁部、３ｅ…側壁部、３ｆ…側壁部、４…ケース嵌合部、４ａ…嵌合凸部、４ｂ…嵌合凹部、５…ねじ固定部、６…低圧側圧力リリーフ部、７…高圧側圧力リリーフ部、８…正極端子、９…負極端子、１０…ケース本体、１０ａ…角部、１０ｂ…壁面腹部、１１…パッキン装着部、１１ａ…小面積部分、１２…パッキン、１３…ねじ穴、１４…ねじ挿通孔、１５…固定ねじ、１６…取っ手部、１７…突起部、１８…突起部、２１…稜線、２２…切欠き部。 DESCRIPTION OF SYMBOLS 1 ... Battery case, 2 ... Upper case, 2a ... Lower surface opening part, 2b ... Upper surface board, 2c ... Side wall part, 2c1 ... Thin wall part, 2d ... Side wall part, 2e ... Side wall part, 2f ... Side wall part, 3 ... Lower case 3a ... Upper surface opening, 3b ... Bottom plate, 3c ... Side wall part, 3c1 ... Thin wall part, 3d ... Side wall part, 3e ... Side wall part, 3f ... Side wall part, 4 ... Case fitting part, 4a ... Fitting convex part, 4b: fitting recess, 5 ... screw fixing part, 6 ... low pressure side pressure relief part, 7 ... high pressure side pressure relief part, 8 ... positive electrode terminal, 9 ... negative electrode terminal, 10 ... case body, 10a ... corner part, 10b ... Wall abdomen, 11 ... packing mounting part, 11a ... small area part, 12 ... packing, 13 ... screw hole, 14 ... screw insertion hole, 15 ... fixing screw, 16 ... handle part, 17 ... projection part, 18 ... projection part, 21 ... ridge line, 22 ... notch.
Claims (7)
下面開口部が形成された矩形箱形の上ケースと、
前記下ケースの前記上面開口部の周壁部と、前記上ケースの前記下面開口部の周壁部との少なくともいずれか一方に嵌合凹部、他方に嵌合凸部がそれぞれ形成され、前記嵌合凸部と前記嵌合凹部とが嵌合可能に接合された状態で前記下ケースと前記上ケースとの間が密閉されるケース嵌合部と、
前記ケース嵌合部の各角部に設けられ、前記上ケースと前記下ケースとをねじ固定するねじ固定部と、
前記上ケースと前記下ケースとを接合させたケース本体に設けられ、前記ケース本体の内部圧力を解放する作動圧力が異なる２段の圧力リリーフ部とを有し、
低圧側の前記圧力リリーフ部は、前記ケース本体の内部の防水性を保持しながら、前記ケース本体の内外気を通気させる防水通気フィルタによって形成され、
高圧側の前記圧力リリーフ部は、前記ケース本体の角部間の壁面腹部に設けられ、前記ケース本体の内部で前記防水通気フィルタの気体透過許容量を上回る前記ケース本体の内部の急激な体積膨張があった場合に前記ケース本体の一部を安全に解放して、前記ケース本体の爆発を防止する安全解放部である防爆防水ケース。 A rectangular box-shaped lower case in which an upper surface opening is formed;
A rectangular box-shaped upper case with a bottom opening,
A fitting recess is formed on at least one of the peripheral wall portion of the upper surface opening of the lower case and the peripheral wall portion of the lower surface opening of the upper case, and a fitting protrusion is formed on the other. A case fitting portion that is sealed between the lower case and the upper case in a state in which the portion and the fitting recess are joined so as to be fitted;
A screw fixing portion that is provided at each corner portion of the case fitting portion and screw-fixes the upper case and the lower case;
Provided in a case body where the upper case and the lower case are joined, and has two stages of pressure relief portions having different operating pressures for releasing the internal pressure of the case body,
The pressure relief portion on the low pressure side is formed by a waterproof ventilation filter that vents the inside and outside air of the case body while maintaining the waterproofness inside the case body,
The pressure relief part on the high-pressure side is provided at a wall surface between the corners of the case body, and sudden volume expansion inside the case body exceeds the gas permissible amount of the waterproof ventilation filter inside the case body. An explosion-proof waterproof case, which is a safety release part that safely releases a part of the case body in the event of an occurrence, and prevents explosion of the case body.
前記安全解放部は、前記ケース本体の内圧上昇時に、前記ケース壁面の引張変形に応じて前記パッキン装着部に装着された前記パッキンを破壊して前記内部圧力を解放する請求項１に記載の防爆防水ケース。 The pressure relief portion on the high pressure side has a packing mounting portion capable of mounting a packing on a fitting surface between the fitting convex portion and the fitting concave portion of the case fitting portion,
2. The explosion-proof according to claim 1, wherein when the internal pressure of the case main body increases, the safety release portion breaks the packing attached to the packing attachment portion according to tensile deformation of the case wall surface and releases the internal pressure. Waterproof case.
前記間隔を他の場所よりも大きくして前記ケース本体の最初に圧力解放させる解放場所を設定する圧力解放位置設定部を有する請求項１に記載の防爆防水ケース。 The safety release portion adjusts an interval between adjacent screw fixing portions,
The explosion-proof waterproof case according to claim 1, further comprising a pressure release position setting unit that sets a release place in which the interval is made larger than the other places and pressure is released first in the case body.
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| JP2016196252A JP6702554B2 (en) | 2016-10-04 | 2016-10-04 | Explosion-proof waterproof case |
| EP17189176.5A EP3306705B1 (en) | 2016-10-04 | 2017-09-04 | Pressure relief mechanism |
| EP21165512.1A EP3859873A1 (en) | 2016-10-04 | 2017-09-04 | Pressure relief case |
| US15/704,675 US10529969B2 (en) | 2016-10-04 | 2017-09-14 | Pressure relief mechanism, case, and pressure relief valve |
| US16/553,402 US11264672B2 (en) | 2016-10-04 | 2019-08-28 | Pressure relief mechanism, case, and pressure relief valve |
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