JP6044450B2 - Power storage device - Google Patents
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- JP6044450B2 JP6044450B2 JP2013108283A JP2013108283A JP6044450B2 JP 6044450 B2 JP6044450 B2 JP 6044450B2 JP 2013108283 A JP2013108283 A JP 2013108283A JP 2013108283 A JP2013108283 A JP 2013108283A JP 6044450 B2 JP6044450 B2 JP 6044450B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Description
本発明は、ケース内の圧力をケース外に開放させる圧力開放弁を有する蓄電装置に関する。 The present invention relates to a power storage device having a pressure release valve that releases pressure inside a case to the outside of the case.
ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、原動機となる電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が搭載されている。この種の二次電池は、例えば、特許文献１に開示されている。二次電池は、金属箔に負極活物質を塗布した負極電極と金属箔に正極活物質を塗布した正極電極との間をセパレータで絶縁し、層状に積層した電極組立体を有する。そして、二次電池のケースには、電極組立体と電解液が収容されている。また、二次電池のケースには、ケース内の圧力をケース外に開放させる圧力開放弁（ガス排出弁）が設けられている。 A vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is equipped with a secondary battery such as a lithium ion battery as a power storage device that stores power supplied to an electric motor serving as a prime mover. This type of secondary battery is disclosed in Patent Document 1, for example. The secondary battery has an electrode assembly in which a negative electrode obtained by applying a negative electrode active material to a metal foil and a positive electrode obtained by applying a positive electrode active material to a metal foil are insulated with a separator and laminated in layers. And the electrode assembly and electrolyte solution are accommodated in the case of the secondary battery. Further, the case of the secondary battery is provided with a pressure release valve (gas discharge valve) that releases the pressure inside the case to the outside of the case.
圧力開放弁は、ケース内の圧力を受けて開裂すると、複数の弁片に分断される。このとき、分断された弁片がケースから分離し、飛散してしまうことは、好ましくない。例えば、飛散した弁片は、他の周辺部品への衝突によって他の周辺部品を傷つける要因や、二次電池の端子を接続するバスバーなどに付着して短絡させる要因などを作ってしまう。 The pressure release valve is divided into a plurality of valve pieces when it is cleaved by receiving pressure in the case. At this time, it is not preferable that the divided valve pieces are separated from the case and scattered. For example, the scattered valve pieces may cause factors that damage other peripheral components due to collision with other peripheral components, or factors that cause a short circuit by attaching to a bus bar that connects the terminals of the secondary battery.
この発明は、このような従来の技術に存在する問題点に着目してなされたものであり、その目的は、破断した弁片の飛散を抑制した蓄電装置を提供することにある。 The present invention has been made paying attention to such problems existing in the prior art, and an object of the present invention is to provide a power storage device in which scattering of a broken valve piece is suppressed.
上記課題を解決する蓄電装置は、電極組立体が収容されたケースに、当該ケース内の圧力をケース外に開放させる圧力開放弁を有する蓄電装置において、前記圧力開放弁の周囲から前記圧力開放弁に亘って、かつ前記圧力開放弁の周囲及び前記圧力開放弁の双方に貼り付けられた貼付部材を有し、前記圧力開放弁は、開裂起点を含む溝を有し、前記貼付部材は、少なくとも一部が前記溝に沿う切り込みを有する。この構成によれば、圧力開放弁は、貼付部材によって、ケースに繋がっている。このため、圧力開放弁が開裂し、複数の弁片に分断された場合でも、これらの弁片は、貼付部材によってケースと繋がっている状態が維持される。したがって、圧力開放弁の開裂に伴って弁片が破断したとしても、その弁片が飛散してしまうことが抑制される。 A power storage device that solves the above-described problems is a power storage device that includes a case in which an electrode assembly is housed and a pressure release valve that releases the pressure inside the case to the outside of the case. over, and have a circumference and attached to both Tagged adhering member of the pressure release valve of said pressure release valve, the pressure relief valve has a groove that contains a cleavage starting point, the sticking member, at least some will have a cut along the groove. According to this configuration, the pressure release valve is connected to the case by the sticking member. For this reason, even when the pressure release valve is cleaved and divided into a plurality of valve pieces, the state in which these valve pieces are connected to the case by the sticking member is maintained. Therefore, even if the valve piece breaks along with the cleavage of the pressure release valve, the valve piece is prevented from scattering.
また、圧力開放弁の開裂時において貼付部材が開裂の抵抗になることが抑制される。つまり、貼付部材の切り込みによって圧力開放弁を、溝に沿ってスムーズに開裂させることができる。 Moreover , it is suppressed that a sticking member becomes resistance of cleavage at the time of cleavage of a pressure relief valve. That is, the pressure relief valve can be smoothly cleaved along the groove by cutting the sticking member.
上記蓄電装置において、前記蓄電装置の好適な例としては、二次電池を挙げることができる。 In the above power storage device, a preferable example of the power storage device is a secondary battery.
本発明によれば、破断した弁片の飛散を抑制することができる。 According to the present invention, scattering of a broken valve piece can be suppressed.
以下、蓄電装置を具体化した一実施形態を図１〜図５にしたがって説明する。
図１に示すように、蓄電装置としての二次電池１０は、ケース１１に電極組立体１２が収容されている。また、ケース１１には、電極組立体１２とともに電解液も収容されている。ケース１１は、有底筒状のケース本体１３と、当該ケース本体１３に電極組立体１２を挿入する開口部を閉塞する平板状の蓋体１４とからなる。ケース本体１３と蓋体１４は、何れも金属製（例えば、ステンレスやアルミニウム）である。また、この実施形態の二次電池１０は、ケース本体１３が有底四角筒状であり、蓋体１４が矩形平板状であることから、その外観が角型をなす角型電池である。また、この実施形態の二次電池１０は、リチウムイオン電池である。
Hereinafter, an embodiment embodying a power storage device will be described with reference to FIGS.
As shown in FIG. 1, in a secondary battery 10 as a power storage device, an electrode assembly 12 is accommodated in a case 11. The case 11 also contains an electrolyte solution together with the electrode assembly 12. The case 11 includes a bottomed cylindrical case main body 13 and a flat lid 14 that closes an opening for inserting the electrode assembly 12 into the case main body 13. Both the case main body 13 and the lid body 14 are made of metal (for example, stainless steel or aluminum). In addition, the secondary battery 10 of this embodiment is a rectangular battery whose appearance is a rectangular shape because the case body 13 has a bottomed rectangular tube shape and the lid body 14 has a rectangular flat plate shape. Moreover, the secondary battery 10 of this embodiment is a lithium ion battery.
電極組立体１２は、正極電極、負極電極、及び正極電極と負極電極を絶縁するセパレータを有する。正極電極は、正極金属箔（アルミニウム箔）の両面に正極活物質を塗布して構成される。負極電極は、負極金属箔（銅箔）の両面に負極活物質を塗布して構成される。そして、電極組立体１２は、複数の正極電極と複数の負極電極を交互に積層するとともに、両電極の間にセパレータを介在した積層構造とされている。また、電極組立体１２には、正極端子１５と負極端子１６が電気的に接続されている。これらの正極端子１５と負極端子１６の各一部分は、蓋体１４からケース１１外に露出している。また、正極端子１５及び負極端子１６には、ケース１１から絶縁するためのリング状の絶縁リング１７ａがそれぞれ取り付けられている。 The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator that insulates the positive electrode from the negative electrode. The positive electrode is configured by applying a positive electrode active material to both surfaces of a positive metal foil (aluminum foil). The negative electrode is configured by applying a negative electrode active material to both surfaces of a negative electrode metal foil (copper foil). The electrode assembly 12 has a stacked structure in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked and a separator is interposed between the electrodes. In addition, a positive electrode terminal 15 and a negative electrode terminal 16 are electrically connected to the electrode assembly 12. Each part of the positive electrode terminal 15 and the negative electrode terminal 16 is exposed to the outside of the case 11 from the lid body 14. Further, a ring-shaped insulating ring 17 a for insulating from the case 11 is attached to the positive terminal 15 and the negative terminal 16, respectively.
ケース１１の蓋体１４には、ケース１１（ケース本体１３）内に電解液を注入するための注液孔１８が穿設されており、その注液孔１８は封止部材１９によって閉塞されている。封止部材１９は、蓋体１４の表面１４ａ（ケース外側の面）に固定されており、ケース１１外に露出している。また、ケース１１には、ケース１１内の圧力が上昇し過ぎないように、ケース１１内の圧力が所定の圧力である開放圧に達した場合に開裂し、ケース内外を連通させる圧力開放弁２０が設けられている。この実施形態において圧力開放弁２０は、ケース１１の蓋体１４に位置している。また、蓋体１４において封止部材１９（注液孔１８）と圧力開放弁２０は、並んで位置している。圧力開放弁２０の開放圧は、ケース１１自体やケース本体１３と蓋体１４の接合部に亀裂や破断などが生じ得る前に開裂し得る圧力に設定されている。 The lid 14 of the case 11 is provided with a liquid injection hole 18 for injecting an electrolyte into the case 11 (case body 13). The liquid injection hole 18 is closed by a sealing member 19. Yes. The sealing member 19 is fixed to the surface 14 a (surface outside the case) of the lid body 14 and is exposed outside the case 11. Further, the pressure release valve 20 that is opened when the pressure in the case 11 reaches an open pressure, which is a predetermined pressure, and communicates the inside and outside of the case so that the pressure in the case 11 does not increase excessively. Is provided. In this embodiment, the pressure release valve 20 is located on the lid 14 of the case 11. Further, in the lid body 14, the sealing member 19 (the liquid injection hole 18) and the pressure release valve 20 are positioned side by side. The release pressure of the pressure release valve 20 is set to a pressure at which the case 11 itself and the joint between the case body 13 and the lid body 14 can be broken before cracks or breakage can occur.
図２に示すように、圧力開放弁２０は、蓋体１４の板厚よりも薄い薄板状の弁体２１を有する。弁体２１は、蓋体１４の上面に凹設された凹部２２の底に位置しており、蓋体１４と一体的に成形されている。この実施形態において圧力開放弁２０は、平面視円形状の周縁を有する。弁体２１は、圧力開放弁２０の周縁に繋がっており、圧力開放弁２０と同様に平面視円形状である。 As shown in FIG. 2, the pressure release valve 20 includes a thin plate-like valve body 21 that is thinner than the plate thickness of the lid body 14. The valve body 21 is located at the bottom of a recess 22 that is recessed in the upper surface of the lid body 14, and is molded integrally with the lid body 14. In this embodiment, the pressure release valve 20 has a circular periphery in plan view. The valve body 21 is connected to the periphery of the pressure release valve 20, and has a circular shape in plan view like the pressure release valve 20.
図２及び図３に示すように、弁体２１の表面２１ａは、溝として交差溝２３を有する。交差溝２３は、弁体２１の周縁間を直線状に延びる２本の直線溝２４，２５と、からなる。図４に示すように、この実施形態において直線溝２４，２５はＶ字形溝である。また、交差溝２３は、２本の直線溝２４，２５が交差する位置に交差部Ｐを有する。交差部Ｐは、ケース１１の内側から加わる圧力が集中し易く、弁体２１が開裂を始める時の起点である開裂起点として想定される。 As shown in FIG.2 and FIG.3, the surface 21a of the valve body 21 has the cross groove 23 as a groove | channel. The intersecting groove 23 includes two straight grooves 24 and 25 extending linearly between the peripheral edges of the valve body 21. As shown in FIG. 4, in this embodiment, the straight grooves 24 and 25 are V-shaped grooves. The intersecting groove 23 has an intersecting portion P at a position where the two straight grooves 24 and 25 intersect. In the intersection P, the pressure applied from the inside of the case 11 is likely to concentrate, and is assumed as a cleavage starting point which is a starting point when the valve body 21 starts to cleave.
この実施形態の二次電池１０は、図１〜図３に示すように、蓋体１４の表面１４ａから圧力開放弁２０の弁体２１の表面２１ａに亘って貼り付けられた貼付部材としての粘着テープ２６を有する。粘着テープ２６は、平面視矩形状であり、圧力開放弁２０を被覆可能な形状である。これにより、圧力開放弁２０の全体は、粘着テープ２６により、ケース１１の外側で被覆されている。 As shown in FIGS. 1 to 3, the secondary battery 10 of this embodiment is an adhesive as a pasting member pasted from the surface 14 a of the lid 14 to the surface 21 a of the valve body 21 of the pressure release valve 20. It has a tape 26. The adhesive tape 26 has a rectangular shape in plan view, and has a shape that can cover the pressure release valve 20. Thereby, the entire pressure release valve 20 is covered with the adhesive tape 26 on the outside of the case 11.
図２〜図４に示すように、粘着テープ２６は、その一部に、圧力開放弁２０の交差溝２３と同形状の切り込み２７を有する。切り込み２７は、交差溝２３の直線溝２４に沿う形状の切り込みと、交差溝２３の直線溝２５に沿う形状の切り込みと、からなり、これら２つの直線状の切り込みは交差部を有する。 As shown in FIGS. 2 to 4, the adhesive tape 26 has a cut 27 having the same shape as the cross groove 23 of the pressure release valve 20 in a part thereof. The notch 27 includes a notch having a shape along the straight groove 24 of the intersecting groove 23 and a notch having a shape along the straight groove 25 of the intersecting groove 23, and these two straight notches have an intersection.
図３及び図４に示すように、粘着テープ２６の粘着面２８は、圧力開放弁２０の周縁の外側において圧力開放弁２０の周囲に位置する蓋体１４の表面１４ａに貼り付けられているとともに、圧力開放弁２０の周縁の内側に位置する弁体２１の表面２１ａに貼り付けられている。つまり、粘着テープ２６は、圧力開放弁２０の周囲から圧力開放弁２０に亘って、かつ圧力開放弁２０の周囲及び圧力開放弁２０の双方に貼り付けられている。 As shown in FIGS. 3 and 4, the adhesive surface 28 of the adhesive tape 26 is attached to the surface 14 a of the lid 14 positioned around the pressure release valve 20 outside the periphery of the pressure release valve 20. The pressure release valve 20 is affixed to the surface 21a of the valve body 21 located inside the periphery. That is, the adhesive tape 26 is attached to both the pressure relief valve 20 and the pressure relief valve 20 from the circumference of the pressure relief valve 20 to the pressure relief valve 20.
また、図３及び図４に示すように、粘着テープ２６は、切り込み２７が圧力開放弁２０の交差溝２３と重なるように貼り付けられている。これにより、粘着テープ２６の切り込み２７は、図３に示すように、蓋体１４を表面１４ａ側から平面視した場合において、圧力開放弁２０の交差溝２３と重なって位置する。 Further, as shown in FIGS. 3 and 4, the adhesive tape 26 is attached so that the cuts 27 overlap the intersecting grooves 23 of the pressure release valve 20. Thereby, as shown in FIG. 3, the notch 27 of the adhesive tape 26 is positioned so as to overlap with the intersecting groove 23 of the pressure release valve 20 when the lid body 14 is viewed from the surface 14 a in plan view.
以下、この実施形態の作用を説明する。
ケース１１内の圧力は、弁体２１の裏面２１ｂが受圧面となることによって弁体２１を外方に膨張させるように加わる。また、弁体２１の交差溝２３には、ケース１１の内側から加わる圧力によって応力が発生している。そして、ケース１１内の圧力が開放圧に達すると、交差部Ｐを起点として交差溝２３が開裂する。
Hereinafter, the operation of this embodiment will be described.
The pressure in the case 11 is applied so that the valve body 21 is expanded outward when the back surface 21b of the valve body 21 becomes a pressure receiving surface. Further, stress is generated in the intersecting groove 23 of the valve body 21 by the pressure applied from the inside of the case 11. When the pressure in the case 11 reaches the opening pressure, the intersecting groove 23 is cleaved starting from the intersecting portion P.
図５に示すように、交差溝２３が開裂すると、弁体２１は、複数（例えば、４つ）の弁片Ｓ１〜Ｓ４に分断されつつ、外側にめくれ上がる。これにより、圧力開放弁２０には、大きな開口２９が生じる。そして、ケース１１内の圧力は、圧力開放弁２０に生じた開口２９を通じてケース１１外に開放される。 As shown in FIG. 5, when the intersecting groove 23 is cleaved, the valve body 21 is turned up outward while being divided into a plurality of (for example, four) valve pieces S1 to S4. Thereby, a large opening 29 is formed in the pressure release valve 20. The pressure in the case 11 is released to the outside of the case 11 through an opening 29 generated in the pressure release valve 20.
この実施形態の圧力開放弁２０の弁体２１は、一体成形によって蓋体１４に繋がっているとともに、粘着テープ２６の粘着力によっても蓋体１４に繋がっている。このため、弁体２１の開裂に伴って弁体２１が分断された場合、各弁片Ｓ１〜Ｓ４は、蓋体１４に繋がっている状態が維持される。例えば、図５に示す弁片Ｓ２，Ｓ４のように、開裂時の衝撃などによって弁体２１の周縁部分において破断（図中に「Ｈ」を付した部分）が生じたとしても、粘着テープ２６によって蓋体１４から分離し難くなっている。つまり、圧力開放弁２０は、開裂時の衝撃によって弁片Ｓ１〜Ｓ４が破断しても、これらの弁片Ｓ１〜Ｓ４は飛散し難く、開弁した状態が維持される。 The valve body 21 of the pressure release valve 20 of this embodiment is connected to the lid body 14 by integral molding, and is also connected to the lid body 14 by the adhesive force of the adhesive tape 26. For this reason, when the valve body 21 is divided along with the cleavage of the valve body 21, the state where the valve pieces S <b> 1 to S <b> 4 are connected to the lid body 14 is maintained. For example, even if the peripheral edge portion of the valve body 21 is broken (portion indicated by “H” in the drawing) due to an impact at the time of cleavage, such as the valve pieces S2 and S4 shown in FIG. This makes it difficult to separate from the lid body 14. That is, even if the valve pieces S1 to S4 are broken by the impact at the time of the cleavage, the pressure release valve 20 is not easily scattered and the opened state is maintained.
したがって、本実施形態によれば、以下に示す効果を得ることができる。
（１）粘着テープ２６を貼り付けることで、破断した弁片Ｓ１〜Ｓ４の飛散を抑制できる。このため、弁片Ｓ１〜Ｓ４の飛散に伴って、他の周辺部品を傷つけてしまうことや、バスバーへ付着することで短絡を生じさせてしまうことなどを好適に抑制できる。
Therefore, according to the present embodiment, the following effects can be obtained.
(1) By sticking the adhesive tape 26, scattering of the broken valve pieces S1 to S4 can be suppressed. For this reason, accompanying the scattering of the valve pieces S <b> 1 to S <b> 4, it is possible to suitably suppress damage to other peripheral components or occurrence of a short circuit by adhering to the bus bar.
（２）圧力開放弁２０の全体に粘着テープ２６を貼り付けることで、弁片Ｓ１〜Ｓ４の飛散をより好適に抑制できる。例えば、圧力開放弁２０の開裂時に弁片が細分化されたとしても、これらの弁片の飛散を抑制できる。 (2) By sticking the adhesive tape 26 to the entire pressure release valve 20, scattering of the valve pieces S1 to S4 can be more suitably suppressed. For example, even if the valve pieces are subdivided when the pressure release valve 20 is broken, scattering of these valve pieces can be suppressed.
（３）粘着テープ２６が切り込み２７を有することにより、圧力開放弁２０の開裂時において粘着テープ２６が開裂の抵抗になることが抑制される。このため、圧力開放弁２０を、交差溝２３に沿ってスムーズに開裂させることができる。その結果、ケース１１内の圧力を開放させる場合の迅速性が損なわれることがなく、圧力開放弁２０を迅速に開弁させることができる。 (3) Since the adhesive tape 26 has the notch 27, it is suppressed that the adhesive tape 26 becomes resistance of cleavage when the pressure release valve 20 is cleaved. For this reason, the pressure release valve 20 can be smoothly cleaved along the intersecting groove 23. As a result, the pressure release valve 20 can be quickly opened without impairing the speediness in releasing the pressure in the case 11.
（４）また、粘着テープ２６は、切り込み２７が交差溝２３に重なるように貼り付けられているので、粘着テープ２６が圧力開放弁２０の開裂の抵抗になることを好適に防止できる。 (4) Moreover, since the adhesive tape 26 is affixed so that the cut | notch 27 may overlap the crossing groove 23, it can prevent suitably that the adhesive tape 26 becomes resistance of the tearing of the pressure release valve 20. FIG.
（５）粘着テープ２６を貼り付けた構成であるため、簡単な構成で弁片Ｓ１〜Ｓ４の飛散を抑制することができる。つまり、飛散を抑制するために圧力開放弁２０に特殊設計を施す必要性が低く、二次電池１０の製造コストの増加を抑制できる。 (5) Since the adhesive tape 26 is affixed, scattering of the valve pieces S1 to S4 can be suppressed with a simple configuration. That is, it is not necessary to specially design the pressure release valve 20 in order to suppress scattering, and an increase in manufacturing cost of the secondary battery 10 can be suppressed.
なお、本実施形態は以下のように変更してもよい。
○ 図６に示すように、二次電池１０は、圧力開放弁２０が開裂した時に分断されると想定される弁片の単位で貼り付けた粘着テープ２６を有していても良い。図６の別例の場合は、圧力開放弁２０が開裂した時に弁片Ｓ１〜Ｓ４に分断される可能性が高いことから、これらの弁片Ｓ１〜Ｓ４に対応する位置毎に粘着テープ２６が貼り付けられている。なお、各粘着テープ２６は、実施形態と同様に、圧力開放弁２０の周囲から圧力開放弁２０に亘って、かつ圧力開放弁２０の周囲及び圧力開放弁２０の双方に貼り付けられている。このように構成した場合でも、実施形態と同様の効果を奏する。
In addition, you may change this embodiment as follows.
As shown in FIG. 6, the secondary battery 10 may have an adhesive tape 26 attached in units of valve pieces that are assumed to be divided when the pressure release valve 20 is cleaved. In the case of the other example of FIG. 6, since there is a high possibility that the pressure release valve 20 is divided into the valve pieces S1 to S4 when the pressure release valve 20 is cleaved, the adhesive tape 26 is provided for each position corresponding to these valve pieces S1 to S4. It is pasted. In addition, each adhesive tape 26 is affixed on both the pressure relief valve 20 circumference | surroundings and the pressure relief valve 20 from the circumference | surroundings of the pressure relief valve 20 to the pressure relief valve 20 similarly to embodiment. Even when configured in this manner, the same effects as in the embodiment can be obtained.
○ 粘着テープ２６は、交差部Ｐと重なる位置に孔を開けた構成としても良い。この場合、交差溝２３の交差部Ｐの位置と粘着テープ２６の孔の位置とを合わせて粘着テープ２６を貼り付ければ良いので、作業性を向上させることができる。 (Circle) the adhesive tape 26 is good also as a structure which opened the hole in the position which overlaps the cross | intersection part P. FIG. In this case, workability can be improved because the adhesive tape 26 may be attached by aligning the position of the intersecting portion P of the intersecting groove 23 with the position of the hole of the adhesive tape 26.
○ 粘着テープ２６は、圧力開放弁２０の全領域に貼り付けられている必要はない。図６に示すように、交差溝２３に重なる部分に孔を開けた構成としても良いし、交差部Ｐ以外の部分に孔が開いていても良い。あるいは、交差溝２３に重なる部分、あるいはそれ以外の部分に重なる部分に切欠のある構成としても良い。一つの連続した粘着テープ２６が圧力開放弁２０とその周囲の双方に貼り付けられていれば粘着テープ２６は一つ有していても良いし、複数有していても良い。 The adhesive tape 26 does not have to be attached to the entire area of the pressure release valve 20. As shown in FIG. 6, a configuration may be adopted in which a hole is formed in a portion overlapping with the intersecting groove 23, or a hole may be formed in a portion other than the intersecting portion P. Or it is good also as a structure which has a notch in the part which overlaps with the cross groove 23, or the part which overlaps with the other part. If one continuous adhesive tape 26 is affixed to both the pressure release valve 20 and its surroundings, one adhesive tape 26 or a plurality of adhesive tapes 26 may be provided.
○ 粘着テープ２６に切り込み２７を設けなくても良い。この場合でも、粘着テープ２６は、圧力開放弁２０の開裂によって剪断される。
○ 粘着テープ２６の切り込み２７の形状を変更しても良い。例えば、切り込み２７は、直線溝２４，２５の一部に沿う長さでも良いし、直線溝２４，２５より長くても良い。
○ It is not necessary to provide the cut 27 in the adhesive tape 26. Even in this case, the adhesive tape 26 is sheared by the cleavage of the pressure release valve 20.
○ The shape of the cut 27 of the adhesive tape 26 may be changed. For example, the cut 27 may have a length along a part of the straight grooves 24 and 25 or may be longer than the straight grooves 24 and 25.
○ また、粘着テープ２６を貼り付けた状態において、切り込み２７は、交差溝２３と完全に重なっていなくても良く、直線溝２４，２５に沿って位置していれば良い。つまり、切り込み２７は、圧力開放弁２０の開裂の抵抗を低下させるものであるから、直線溝２４，２５に沿って位置していれば、その効果は発揮できる。 In addition, in the state where the adhesive tape 26 is pasted, the notch 27 may not completely overlap the intersecting groove 23, and may be located along the linear grooves 24 and 25. That is, since the cut 27 reduces the resistance of the pressure relief valve 20 to break, the effect can be exhibited if it is located along the straight grooves 24 and 25.
○ 交差溝２３は、Ｘ字状に代えて、Ｙ字状に変更しても良い。
○ 弁体２１における溝の形状を変更しても良い。例えば、１本の直線状の溝や例えば「Ｃ」字状の溝など、交差部を有さない溝でも良い。なお、これらの溝は開裂起点を有する。
The crossing groove 23 may be changed to a Y shape instead of the X shape.
○ The shape of the groove in the valve body 21 may be changed. For example, a single linear groove or a groove having no intersection, such as a “C” -shaped groove, may be used. In addition, these grooves have a cleavage starting point.
○ 弁体２１に設ける溝の断面形状を変更しても良い。
○ 弁体２１の表裏両面に溝を設けなくても良い。このように弁体２１に溝を設けていない場合でも、弁体２１は蓋体１４の板厚よりも薄いことから、ケース１１内の圧力が上昇することで開裂する。また、開裂に伴って分断した弁片は、粘着テープ２６によって飛散が抑制される。
O You may change the cross-sectional shape of the groove | channel provided in the valve body 21. FIG.
O It is not necessary to provide a groove on both front and back surfaces of the valve body 21. Even when the valve body 21 is not provided with a groove in this way, the valve body 21 is thinner than the plate thickness of the lid body 14, so that it is cleaved when the pressure in the case 11 increases. Further, the pressure-sensitive adhesive tape 26 prevents the valve piece that has been divided along with the cleavage from being scattered.
○ 弁体２１の裏面に開裂溝を設けても良い。
○ ケース１１の形状を変更しても良い。例えば、ケース１１は円筒型でも良い。
○ 圧力開放弁２０をケース１１とは別体部品とし、その圧力開放弁２０をケース１１に接合しても良い。接合は、例えば溶接（例えばレーザ溶接）などで行う。
○ A cleavage groove may be provided on the back surface of the valve body 21.
○ The shape of the case 11 may be changed. For example, the case 11 may be cylindrical.
The pressure release valve 20 may be a separate part from the case 11 and the pressure release valve 20 may be joined to the case 11. Joining is performed by welding (for example, laser welding), for example.
○ 圧力開放弁２０の位置を変更しても良い。例えば、ケース本体１３（ケース１１）の底に圧力開放弁２０を設けても良い。また、ケース本体１３（ケース１１）の側壁に圧力開放弁２０を設けても良い。 ○ The position of the pressure release valve 20 may be changed. For example, the pressure release valve 20 may be provided at the bottom of the case body 13 (case 11). Moreover, you may provide the pressure release valve 20 in the side wall of the case main body 13 (case 11).
○ 電極組立体１２は、積層型に限らず、帯状の正極電極と帯状の負極電極を捲回して層状に積層した捲回型でも良い。
○ 二次電池１０は、リチウムイオン二次電池であったが、これに限らず、他の二次電池であっても良い。要は、正極活物質層と負極活物質層との間をイオンが移動するとともに電荷の授受を行うものであれば良い。また、蓄電装置としてキャパシタでも良い。
The electrode assembly 12 is not limited to the laminated type, and may be a wound type in which a belt-like positive electrode and a belt-like negative electrode are wound and laminated in layers.
The secondary battery 10 is a lithium ion secondary battery, but is not limited thereto, and may be another secondary battery. In short, any ion may be used as long as ions move between the positive electrode active material layer and the negative electrode active material layer and transfer charge. Further, a capacitor may be used as the power storage device.
○ 二次電池１０は、車両電源装置として自動車に搭載しても良いし、産業用車両に搭載しても良い。また、定置用の蓄電装置に適用しても良い。
次に、上記実施形態及び別例から把握できる技術的思想を以下に追記する。
(Circle) the secondary battery 10 may be mounted in a motor vehicle as a vehicle power supply device, and may be mounted in an industrial vehicle. Further, the present invention may be applied to a stationary power storage device.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
（イ）切り込みは、溝に重なって位置している。この構成によれば、貼付部材が圧力開放弁の開裂の抵抗になることを好適に防止できる。 (A) The cut is located so as to overlap the groove. According to this structure, it can prevent suitably that a sticking member becomes resistance of tearing of a pressure relief valve.
１０…二次電池、１１…ケース、１２…電極組立体、２０…圧力開放弁、２１…弁体、２６…粘着テープ、２７…切り込み、Ｐ…交差部。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11 ... Case, 12 ... Electrode assembly, 20 ... Pressure release valve, 21 ... Valve body, 26 ... Adhesive tape, 27 ... Cut, P ... Crossing part.
Claims (2)
前記圧力開放弁の周囲から前記圧力開放弁に亘って、かつ前記圧力開放弁の周囲及び前記圧力開放弁の双方に貼り付けられた貼付部材を有し、
前記圧力開放弁は、開裂起点を含む溝を有し、
前記貼付部材は、少なくとも一部が前記溝に沿う切り込みを有する蓄電装置。 In a power storage device having a pressure release valve for releasing the pressure in the case to the outside of the case in the case in which the electrode assembly is accommodated,
It said to extend from the periphery of the pressure release valve on the pressure release valve, and have a sticking member which is adhered to both the ambient and the pressure release valve of said pressure release valve,
The pressure relief valve has a groove including a cleavage origin;
The sticking member is at least partially to have a cut along the groove electrical storage device.
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