JP6090005B2 - Power storage device - Google Patents
Power storage device Download PDFInfo
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- JP6090005B2 JP6090005B2 JP2013132612A JP2013132612A JP6090005B2 JP 6090005 B2 JP6090005 B2 JP 6090005B2 JP 2013132612 A JP2013132612 A JP 2013132612A JP 2013132612 A JP2013132612 A JP 2013132612A JP 6090005 B2 JP6090005 B2 JP 6090005B2
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- pressure release
- release valve
- valve
- nickel plating
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- 238000003860 storage Methods 0.000 title claims description 17
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 154
- 238000007747 plating Methods 0.000 claims description 107
- 229910052759 nickel Inorganic materials 0.000 claims description 77
- 238000003776 cleavage reaction Methods 0.000 claims description 39
- 230000007017 scission Effects 0.000 claims description 39
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 8
- 239000010949 copper Substances 0.000 claims description 8
- 239000008151 electrolyte solution Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 11
- 239000002335 surface treatment layer Substances 0.000 claims 1
- 230000008859 change Effects 0.000 description 22
- 230000002093 peripheral effect Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 230000008569 process Effects 0.000 description 11
- 230000015572 biosynthetic process Effects 0.000 description 10
- 229910052845 zircon Inorganic materials 0.000 description 10
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 10
- 239000000463 material Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000011888 foil Substances 0.000 description 5
- 230000000873 masking effect Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 239000007773 negative electrode material Substances 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- 238000007772 electroless plating Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
Classifications
-
- 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
Description
この発明は、蓄電装置に関する。 The present invention relates to a power storage device.
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。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おり、ケースの壁面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. 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. The case of the secondary battery contains an electrode assembly and an electrolytic solution, and a pressure release valve (gas discharge valve) for releasing the pressure inside the case to the outside of the case is provided on the wall surface of the case.
アルミニウムは温度が上昇するにつれて強度が低下する性質を有するため、特許文献１に記載の二次電池のようにアルミニウム製の圧力開放弁を採用する場合では、ケースの温度が上昇するほど圧力開放弁の強度が低下することとなる。これにより、特許文献１に記載の二次電池では、ケースが高温となると、圧力開放弁が予め設定された作動圧よりも極端に低い圧力で作動するおそれがある。そこで、特許文献２に記載の二次電池では、ニッケル等、強度の高い金属材料とアルミニウムとのクラッド材で形成された圧力開放弁を採用している。こうした特許文献２に記載の二次電池によれば、アルミニウムによって圧力開放弁における通電性を確保しつつ、強度の高い金属材料によって圧力開放弁の強度を向上させて温度変化に起因する圧力開放弁の作動圧の変動を抑制することができる。 Since aluminum has a property of decreasing in strength as the temperature rises, when an aluminum pressure relief valve is employed as in the secondary battery described in Patent Document 1, the pressure relief valve increases as the case temperature rises. The strength of the will decrease. As a result, in the secondary battery described in Patent Document 1, when the case becomes hot, the pressure release valve may operate at a pressure extremely lower than the preset operating pressure. Therefore, the secondary battery described in Patent Document 2 employs a pressure release valve formed of a clad material of a strong metal material such as nickel and aluminum. According to such a secondary battery described in Patent Document 2, the pressure relief valve caused by temperature change is achieved by improving the strength of the pressure relief valve with a high-strength metal material while ensuring the conductivity in the pressure relief valve with aluminum. The fluctuation of the operating pressure can be suppressed.
ところで、クラッド材で形成された圧力開放弁では、クラッド材を構成する各金属の熱膨張率の違いにより反りが発生したり剥がれたりするおそれがあり、この点で改善の余地があった。 By the way, in a pressure relief valve formed of a clad material, there is a possibility that warpage may occur or peel off due to a difference in thermal expansion coefficient of each metal constituting the clad material, and there is room for improvement in this respect.
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、ケースの温度変化に起因する圧力開放弁の作動圧の変動を抑制しつつ、圧力開放弁で反りや剥がれが生じることを抑制することのできる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 its purpose is to suppress the fluctuation of the operating pressure of the pressure release valve due to the temperature change of the case, while reducing the pressure. An object of the present invention is to provide a power storage device that can suppress warping and peeling with an open valve.
上記課題を解決するための蓄電装置は、電極組立体と電解液が収容されたケースを備えるとともに、ケース内の圧力をケース外に開放させる圧力開放弁をケースの壁面に有し、圧力開放弁はアルミニウム製であり、圧力開放弁を有するケースの壁面の、少なくとも圧力開放弁上の面の一部にはめっき層があり、めっき層はニッケルめっき層又は銅めっき層であるものである。そして、めっき層は、圧力開放弁を有するケースの壁面の両面に、かつ少なくとも圧力開放弁を含む部分に形成される。 A power storage device for solving the above problems includes a case in which an electrode assembly and an electrolytic solution are accommodated, and has a pressure release valve on a wall surface of the case for releasing the pressure in the case to the outside of the case. Is made of aluminum, and at least part of the surface of the wall of the case having the pressure release valve has a plating layer, and the plating layer is a nickel plating layer or a copper plating layer. The plating layer is formed on both surfaces of the wall surface of the case having the pressure release valve, and at least on the portion including the pressure release valve.
ニッケル又は銅でめっき処理して形成されためっき層は、温度変化による強度の変化が生じにくい。上記構成によれば、ケースの温度が上昇しても圧力開放弁の強度を確保する
ことができ、ケースの温度変化に起因する圧力開放弁の作動圧の変動を抑制することができる。更に、上記構成によれば、圧力開放弁をクラッド材で形成しないため、圧力開放弁に反りが発生したり剥がれたりすることを抑制することもできる。
また、めっき層を、圧力開放弁を有するケースの壁面の両面に、かつ少なくとも圧力開放弁を含む部分に形成する構成によれば、圧力開放弁自体の強度をより確保することができ、ケースの温度変化に起因する圧力開放弁の作動圧の変動をより抑制することができる。
The plating layer formed by plating with nickel or copper is unlikely to change in strength due to a temperature change. According to the above configuration, the strength of the pressure release valve can be ensured even when the temperature of the case rises, and fluctuations in the operating pressure of the pressure release valve due to the temperature change of the case can be suppressed. Furthermore, according to the said structure, since a pressure release valve is not formed with a clad material, it can also suppress that a pressure release valve generate | occur | produces or peels.
In addition, according to the configuration in which the plating layer is formed on both surfaces of the wall surface of the case having the pressure release valve and at least in the portion including the pressure release valve, the strength of the pressure release valve itself can be further secured. Variations in the operating pressure of the pressure release valve due to temperature change can be further suppressed.
圧力開放弁が開裂溝を有する場合には、開裂溝を含む部分をめっき層とすることも可能である。
圧力開放弁の開裂溝部分は厚さが薄いため、ケースの温度変化による強度低下が生じやすい。このため、開裂溝が形成された圧力開放弁では、ケースの温度変化に起因する圧力開放弁の作動圧の変動がより顕著になるおそれがある。上記構成によれば、開裂溝においてケースの温度変化による強度の低下が生じにくくなる。したがって、開裂溝が形成された圧力開放弁であってもケースの温度変化に起因して作動圧が変動することを抑制することができる。
When the pressure release valve has a cleavage groove, a portion including the cleavage groove can be used as a plating layer.
Since the cleavage groove portion of the pressure release valve is thin, the strength is likely to decrease due to the temperature change of the case. For this reason, in the pressure release valve in which the cleavage groove is formed, the fluctuation of the operating pressure of the pressure release valve due to the temperature change of the case may become more remarkable. According to the said structure, the fall of the intensity | strength by the temperature change of a case becomes difficult to produce in a cleavage groove. Therefore, even if it is the pressure relief valve in which the cleavage groove was formed, it can suppress that an operating pressure fluctuates due to the temperature change of a case.
めっき層が形成される部分としては、例えば、圧力開放弁上の全面が挙げられる。
上記構成によれば、圧力開放弁自体の強度をより確保することができ、ケースの温度変化に起因する圧力開放弁の作動圧の変動をより抑制することができる。
Examples of the portion where the plating layer is formed include the entire surface on the pressure release valve.
According to the said structure, the intensity | strength of the pressure release valve itself can be ensured more, and the fluctuation | variation of the operating pressure of the pressure release valve resulting from the temperature change of a case can be suppressed more.
めっき層がニッケルめっき層である場合には、圧力開放弁を有するケースの壁面の、少なくとも圧力開放弁を含む部分とニッケルめっき層との間を下地処理層として機能する中間層とすることも可能である。 When the plating layer is a nickel plating layer, it is possible to use an intermediate layer that functions as a base treatment layer between the nickel plating layer and at least the portion including the pressure relief valve on the wall surface of the case having the pressure relief valve. It is.
上記構成によれば、中間層が下地処理層として機能することにより、圧力開放弁にニッケルめっき層を形成しやすくすることができる。
蓄電装置としては、例えば二次電池が挙げられる。
According to the above configuration, the nickel plating layer can be easily formed on the pressure release valve by the intermediate layer functioning as the base treatment layer.
An example of the power storage device is a secondary battery.
本発明によれば、ケースの温度変化に起因する圧力開放弁の作動圧の変動を抑制しつつ、圧力開放弁で反りや剥がれが生じることを抑制することができる。 ADVANTAGE OF THE INVENTION According to this invention, it can suppress that curvature and peeling arise with a pressure release valve, suppressing the fluctuation | variation of the operating pressure of the pressure release valve resulting from the temperature change of a case.
以下、蓄電装置を具体化した一実施形態について図１〜図４を参照して説明する。
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、ケース本体１３に電極組立体１２を挿入する開口部１３ａ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とがケース１１として組み立てられた状態において、蓋体１４の表面１４ａがケース１１の外側に位置する面となっており、蓋体１４の裏面１４ｂがケース１１の内側に位置する面となっている。そして、ケース１１においては、蓋体１４の裏面１４ｂにおける外周部分とケース本体１３の開口部１３ａとが互いに接合された接合部１４ｃとなっている。ケース本体１３と蓋体１４は、何れもアルミニウム製である。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 13 a into which the electrode assembly 12 is inserted into the case main body 13. In a state where the case body 13 and the lid body 14 are assembled as the case 11, the front surface 14 a of the lid body 14 is a surface located outside the case 11, and the back surface 14 b of the lid body 14 is located inside the case 11. It is a surface to be located. And in case 11, the outer peripheral part in the back surface 14b of the cover body 14 and the opening part 13a of the case main body 13 become the junction part 14c joined mutually. Both the case main body 13 and the lid body 14 are made of 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.
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１１内の圧力をケース１１外に開放させる圧力開放弁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の壁面としての蓋体１４に位置している。また、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１４ｃ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。そして、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の表面１４ａ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。すなわち、圧力開放弁２０は、弁体２１上の表面２１ａがケース１１の蓋体１４の表面１４ａの一部となっており、弁体２１上の裏面２１ｂ（図３）が蓋体１４の裏面１４ｂの一部となっている。また、圧力開放弁２０はケース１１と同様にアルミニウム製である。 Further, the case 11 is cleaved when the pressure in the case 11 reaches an open pressure, which is a predetermined pressure, so that the pressure in the case 11 does not increase too much. A pressure release valve 20 is provided for opening the valve. In this embodiment, the pressure release valve 20 is located on the lid body 14 as a wall surface of the case 11. The opening pressure of the pressure release valve 20 is set to a pressure at which the case 11 itself and the joint 14c between the case main body 13 and the lid body 14 can be broken before cracks or breakage can occur. The pressure release valve 20 has 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 surface 14 a of the lid body 14 and is formed integrally with the lid body 14. That is, in the pressure release valve 20, the surface 21 a on the valve body 21 is a part of the surface 14 a of the lid body 14 of the case 11, and the back surface 21 b (FIG. 3) on the valve body 21 is the back surface of the lid body 14. 14b. Further, the pressure release valve 20 is made of aluminum like the case 11.
図２に示すように、この実施形態の圧力開放弁２０は、平行な２つの直線部２６，２７を弧部２８，２９で繋いだトラック形状の周縁を有する。なお、圧力開放弁２０の弁体２１は、圧力開放弁２０の周縁に繋がっており、圧力開放弁２０と同様にトラック形状である。また、弁体２１の表面２１ａは、開裂溝を有する。開裂溝は、交差溝３１と、弧部２８，２９に沿う複数の弧状溝３２，３３と、直線部２６，２７に沿う複数の直線状溝３４，３５と、からなる。交差溝３１は、開裂起点としての交差部Ｐで交差する２本の直線溝３６，３７からなる。この実施形態において、交差溝３１と、弧状溝３２，３３と、直線状溝３４，３５とは、何れもＶ字形溝である。 As shown in FIG. 2, the pressure relief valve 20 of this embodiment has a track-shaped periphery in which two parallel straight portions 26 and 27 are connected by arc portions 28 and 29. The valve body 21 of the pressure release valve 20 is connected to the periphery of the pressure release valve 20 and has a track shape like the pressure release valve 20. Moreover, the surface 21a of the valve body 21 has a cleavage groove. The cleavage groove includes an intersecting groove 31, a plurality of arc-shaped grooves 32 and 33 along the arc portions 28 and 29, and a plurality of linear grooves 34 and 35 along the straight portions 26 and 27. The intersecting groove 31 includes two straight grooves 36 and 37 that intersect at an intersecting portion P as a cleavage starting point. In this embodiment, the intersecting grooves 31, the arc-shaped grooves 32 and 33, and the linear grooves 34 and 35 are all V-shaped grooves.
そして、図２に示すように、弁体２１の表面２１ａには、交差溝３１に沿う仮想直線Ｙ１，Ｙ２を想定したとき、仮想直線Ｙ１，Ｙ２と圧力開放弁２０の周縁によって囲まれる複数の領域Ｓ１，Ｓ２，Ｓ３，Ｓ４が想定される。領域Ｓ１と領域Ｓ２は、直線部２６，２７を含む領域であり、互いに仮想直線Ｙ１と仮想直線Ｙ２の交差点を対称の中心として点対称である。領域Ｓ３と領域Ｓ４は、弧部２８，２９を含む領域であり、互いに仮想直線Ｙ１と仮想直線Ｙ２の交差点を対称の中心として点対称である。 As shown in FIG. 2, on the surface 21 a of the valve body 21, assuming virtual straight lines Y <b> 1 and Y <b> 2 along the intersecting grooves 31, a plurality of virtual straight lines Y <b> 1 and Y <b> 2 and a plurality of peripheral edges of the pressure release valve 20 are surrounded. Regions S1, S2, S3 and S4 are assumed. The region S1 and the region S2 are regions including the straight line portions 26 and 27, and are point-symmetric with respect to the intersection point of the virtual straight line Y1 and the virtual straight line Y2. The region S3 and the region S4 are regions including the arc portions 28 and 29, and are point-symmetric with respect to the intersection of the virtual straight line Y1 and the virtual straight line Y2.
図１に示すように、ケース１１の蓋体１４は、表面１４ａと裏面１４ｂとの両面にニッケルめっき層２４，２５を有する。この実施形態のケース１１では、蓋体１４の裏面１４ｂにおける接合部１４ｃと、蓋体１４の表面１４ａにおける外周部分とにはニッケルめっき層２４，２５を有しておらず、これらの部分を除く蓋体１４の表面１４ａ及び裏面１４ｂの全面にニッケルめっき層２４，２５を有している。 As shown in FIG. 1, the lid 14 of the case 11 has nickel plating layers 24 and 25 on both the front surface 14a and the back surface 14b. In the case 11 of this embodiment, the joint portion 14c on the back surface 14b of the lid body 14 and the outer peripheral portion on the front surface 14a of the lid body 14 do not have the nickel plating layers 24 and 25, and these portions are excluded. Nickel plating layers 24 and 25 are provided on the entire surface 14 a and back surface 14 b of the lid 14.
図３に示すように、この実施形態では、圧力開放弁２０の弁体２１の表面２１ａの全面にもニッケルめっき層２４を有している。ここで、弁体２１の表面２１ａにおいて、ニッケルめっき層２４は、弁体２１の表面２１ａの開裂溝と、弁体２１の表面２１ａにおける開裂溝以外の部分と、にある。弁体２１の表面２１ａの開裂溝は、溝面全体にニッケルめっき層２４を有する。図３には、直線溝３６におけるニッケルめっき層２４を示しているが、それ以外の開裂溝である直線溝３７、弧状溝３２，３３、及び直線状溝３４，３５の各溝面にも、ニッケルめっき層２４を有する。更に、圧力開放弁２０は、ケース１１の蓋体１４の裏面１４ｂの一部である弁体２１の裏面２１ｂの全面にも、ニッケルめっき層２５を有する。 As shown in FIG. 3, in this embodiment, the nickel plating layer 24 is also provided on the entire surface 21 a of the valve body 21 of the pressure release valve 20. Here, on the surface 21 a of the valve body 21, the nickel plating layer 24 is located in the cleavage groove on the surface 21 a of the valve body 21 and the portion other than the cleavage groove on the surface 21 a of the valve body 21. The cleavage groove on the surface 21a of the valve body 21 has a nickel plating layer 24 over the entire groove surface. In FIG. 3, the nickel plating layer 24 in the straight groove 36 is shown, but the groove surfaces of the other straight grooves 37, arc-shaped grooves 32 and 33, and straight grooves 34 and 35, which are other cleavage grooves, A nickel plating layer 24 is provided. Further, the pressure release valve 20 has a nickel plating layer 25 on the entire back surface 21 b of the valve body 21, which is a part of the back surface 14 b of the lid 14 of the case 11.
そして、この実施形態では、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂを含む、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂとニッケルめっき層２４，２５との間に中間層４４，４５がある。具体的には、ケース１１の蓋体１４の裏面１４ｂにおける接合部１４と、蓋体１４の表面１４ａにおける外周部分とを除く、蓋体１４の表面１４ａ及び裏面１４ｂの全体に中間層４４，４５がある。更に、圧力開放弁２０の弁体２１の表面２１ａの開裂溝と、弁体２１の表面２１ａにおける開裂溝以外の部分と、に中間層４４がある。要するに、ケース１１の蓋体１４におけるニッケルめっき層２４，２５の全形成範囲において、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂを含む、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂは、ニッケルめっき層２４，２５との間に中間層４４，４５を有している。また、この実施形態の中間層４４，４５は、ジルコンめっき層である。 In this embodiment, the intermediate layer 44 is provided between the nickel plating layers 24 and 25 and the front surface 14a and the rear surface 14b of the lid 14 of the case 11 including the front surface 21a and the rear surface 21b of the valve body 21 of the pressure release valve 20. 45. Specifically, the intermediate layers 44 and 45 are entirely formed on the front surface 14a and the back surface 14b of the lid body 14 except for the joint portion 14 on the back surface 14b of the lid body 14 of the case 11 and the outer peripheral portion on the front surface 14a of the lid body 14. There is. Further, an intermediate layer 44 is provided in the cleavage groove on the surface 21 a of the valve body 21 of the pressure release valve 20 and the portion other than the cleavage groove on the surface 21 a of the valve body 21. In short, in the entire formation range of the nickel plating layers 24 and 25 in the lid body 14 of the case 11, the front surface 14 a and the back surface 14 b of the lid body 14 of the case 11, including the front surface 21 a and the back surface 21 b of the valve body 21 of the pressure release valve 20. Has intermediate layers 44, 45 between the nickel plating layers 24, 25. Further, the intermediate layers 44 and 45 of this embodiment are zircon plating layers.
尚、圧力開放弁２０の弁体２１において、表面２１ａ及び裏面２１ｂのニッケルめっき層２４，２５を除いた厚さは、開裂溝部分における弁体２１の厚さＷ２が、開裂溝以外の部分における弁体２１の厚さＷ１と比較して薄い。そして、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂにおけるニッケルめっき層２４，２５の厚さＷ３と中間層４４，４５の厚さＷ４とは、例えば厚さＷ１や厚さＷ２よりも薄くなっている。厚さＷ２と厚さＷ３は、例えば、厚さＷ２と厚さＷ３との比率が２：１となる関係にある。 In the valve body 21 of the pressure release valve 20, the thickness of the front surface 21a and the back surface 21b excluding the nickel plating layers 24 and 25 is such that the thickness W2 of the valve body 21 at the cleavage groove portion is at a portion other than the cleavage groove. It is thinner than the thickness W1 of the valve body 21. The thickness W3 of the nickel plating layers 24 and 25 and the thickness W4 of the intermediate layers 44 and 45 on the front surface 21a and the rear surface 21b of the pressure release valve 20 are, for example, greater than the thickness W1 and the thickness W2. It is getting thinner. For example, the thickness W2 and the thickness W3 have a relationship in which the ratio of the thickness W2 to the thickness W3 is 2: 1.
次に、この実施形態の作用について図４を参照して説明する。尚、図４は、ニッケルめっき層２４，２５が形成された圧力開放弁２０とニッケルめっき層２４，２５が形成されていない圧力開放弁２０とについて、本出願人が行った実験のデータを示す図である。 Next, the operation of this embodiment will be described with reference to FIG. FIG. 4 shows data of experiments conducted by the present applicant on the pressure release valve 20 in which the nickel plating layers 24 and 25 are formed and the pressure release valve 20 in which the nickel plating layers 24 and 25 are not formed. FIG.
図４に示すように、圧力開放弁２０の弁体２１の表面２１ａや裏面２１ｂにニッケルめっき処理を施した本実施形態では、ケース１１の温度が上昇しても作動圧が低下しにくい。これは、温度変化による強度の変化が生じにくいニッケルめっき層２４，２５の性質により、ケース１１の温度が上昇しても圧力開放弁２０の強度を確保することができるためである。そして、こうした本実施形態では、ケース１１が高温となったときにも、予め設定された作動圧とほとんど変わらない作動圧で圧力開放弁２０を作動させることができる。 As shown in FIG. 4, in this embodiment in which the surface 21 a and the back surface 21 b of the valve body 21 of the pressure release valve 20 are subjected to nickel plating, the operating pressure is unlikely to decrease even if the temperature of the case 11 increases. This is because the strength of the pressure release valve 20 can be ensured even when the temperature of the case 11 rises due to the nature of the nickel plating layers 24 and 25 that are less likely to change in strength due to temperature changes. In this embodiment, even when the case 11 becomes high temperature, the pressure release valve 20 can be operated with an operating pressure that is hardly different from a preset operating pressure.
一方、圧力開放弁２０の弁体２１の表面２１ａや裏面２１ｂにニッケルめっき処理を施さない場合には、アルミニウムの性質により、ケース１１の温度上昇による圧力開放弁２０の強度の低下度合いが本実施形態と比較して大きくなる。このため、ケース１１が高温となったときには、予め設定された作動圧からの低下度合いが本実施形態と比較して大きい作動圧で圧力開放弁２０が作動するおそれがある。 On the other hand, when nickel plating is not performed on the front surface 21a and the back surface 21b of the valve body 21 of the pressure release valve 20, the degree of decrease in the strength of the pressure release valve 20 due to the temperature rise of the case 11 is due to the nature of aluminum. Larger than the form. For this reason, when case 11 becomes high temperature, there exists a possibility that the pressure relief valve 20 may operate | move with the operating pressure in which the fall degree from the preset operating pressure is large compared with this embodiment.
次に、二次電池１０の製造方法について、主にケース１１の蓋体１４へのニッケルめっき層２４，２５の形成方法を説明する。
ケース１１の蓋体１４にめっき処理を施す前に、まず、圧力開放弁２０の弁体２１の表面２１ａに交差溝３１、弧状溝３２，３３、及び直線状溝３４，３５といった開裂溝を形成する。開裂溝の形成後、ケース１１の蓋体１４及び圧力開放弁２０へのジルコンめっき処理を開始する。尚、ジルコンめっき処理に際しては、ケース１１のケース本体１３との接合部１４ｃとして機能する蓋体１４の裏面１４ｂの外周部分と、蓋体１４の表面１４ａの外周部分とにマスキングを施す。また、ジルコンめっき処理は、圧力開放弁２０が一体形成されたアルミニウム製のケース１１の蓋体１４を処理浴に含浸する、いわゆる無電解めっきにより行う。そして、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂと、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂと、にジルコンめっき層からなる中間層４４，４５が形成される。中間層４４，４５の形成が完了したら、ケース１１の蓋体１４及び圧力開放弁２０へのニッケルめっき処理を開始する。尚、ニッケルめっき処理も、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂに上記マスキングを施した状態で行う。また、ニッケルめっき処理も無電解めっきにより行う。ニッケルめっき層２４，２５の形成が完了すると、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂを含む、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂと、ニッケルめっき層２４，２５との間に、中間層４４，４５が位置した状態となる。そして、ニッケルめっき層２４，２５の形成が完了したら、ケース１１のケース本体１３の開口部１３ａと蓋体１４の裏面１４ｂの外周部分とが、例えばレーザー溶接によって接合される。これにより、ケース１１のケース本体１３と蓋体１４が接合部１４ｃによって接合される。
Next, a method for forming the nickel plating layers 24 and 25 on the lid 14 of the case 11 will be mainly described as a method for manufacturing the secondary battery 10.
Before plating the lid 14 of the case 11, first, a cleavage groove such as a cross groove 31, arc-shaped grooves 32 and 33, and linear grooves 34 and 35 is formed on the surface 21 a of the valve body 21 of the pressure release valve 20. To do. After the formation of the cleavage groove, the zircon plating process on the lid 14 and the pressure release valve 20 of the case 11 is started. In the zircon plating process, masking is applied to the outer peripheral portion of the back surface 14b of the lid body 14 that functions as the joint portion 14c of the case 11 with the case main body 13 and the outer peripheral portion of the surface 14a of the lid body 14. The zircon plating process is performed by so-called electroless plating in which a treatment bath is impregnated with a lid 14 of an aluminum case 11 with which a pressure release valve 20 is integrally formed. And the intermediate | middle layers 44 and 45 which consist of a zircon plating layer are formed in the surface 14a and the back surface 14b of the cover body 14 of the case 11, and the surface 21a and the back surface 21b of the valve body 21 of the pressure release valve 20. When the formation of the intermediate layers 44 and 45 is completed, the nickel plating process on the lid body 14 and the pressure release valve 20 of the case 11 is started. The nickel plating process is also performed with the masking applied to the front surface 14 a and the back surface 14 b of the lid 14 of the case 11. The nickel plating process is also performed by electroless plating. When the formation of the nickel plating layers 24 and 25 is completed, the front surface 14a and the back surface 14b of the lid body 14 of the case 11 including the front surface 21a and the back surface 21b of the valve body 21 of the pressure release valve 20, the nickel plating layers 24 and 25, In between, the intermediate layers 44 and 45 are located. And if formation of the nickel plating layers 24 and 25 is completed, the opening part 13a of the case main body 13 of the case 11 and the outer peripheral part of the back surface 14b of the cover body 14 will be joined by laser welding, for example. Thereby, the case main body 13 and the cover body 14 of the case 11 are joined by the joining part 14c.
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）圧力開放弁２０は、弁体２１の表面２１ａや裏面２１ｂの全面にニッケルめっき層２４，２５を有しているため、ケース１１の温度変化に起因する圧力開放弁２０の作動圧の変動を抑制することができる。更に、圧力開放弁２０の弁体２１にクラッド材を採用していないため、圧力開放弁２０に反りが発生したり剥がれたりすることを抑制することもできる。
Therefore, according to the present embodiment, the following effects can be obtained.
(1) Since the pressure release valve 20 has the nickel plating layers 24 and 25 on the entire surface 21a and back surface 21b of the valve body 21, the operating pressure of the pressure release valve 20 due to the temperature change of the case 11 is reduced. Variations can be suppressed. Furthermore, since the clad material is not employed for the valve body 21 of the pressure release valve 20, it is possible to suppress the warp or peeling of the pressure release valve 20.
（２）圧力開放弁２０の弁体２１において、開裂溝部分の厚さＷ２がその他の部分の厚さＷ１と比較して薄いため、弁体２１における開裂溝部分はケース１１の温度変化による強度低下が生じやすい。このため、開裂溝が形成された圧力開放弁２０では、ケース１１の温度変化に起因する圧力開放弁２０の作動圧の変動がより顕著になるおそれがある。本実施形態によれば、圧力開放弁２０の弁体２１における開裂溝にもニッケルめっき層２４があるため、開裂溝においてケース１１の温度変化による強度の低下が生じにくくなる。したがって、開裂溝が形成された圧力開放弁２０であってもケース１１の温度変化に起因して作動圧が変動することを抑制することができる。 (2) In the valve body 21 of the pressure release valve 20, since the thickness W2 of the cleavage groove portion is thinner than the thickness W1 of the other portions, the cleavage groove portion in the valve body 21 has strength due to the temperature change of the case 11. Decline is likely to occur. For this reason, in the pressure release valve 20 in which the cleavage groove is formed, the fluctuation of the operating pressure of the pressure release valve 20 due to the temperature change of the case 11 may become more remarkable. According to the present embodiment, since the nickel plating layer 24 is also present in the cleavage groove in the valve body 21 of the pressure release valve 20, it is difficult for the strength to decrease due to the temperature change of the case 11 in the cleavage groove. Therefore, even if it is the pressure release valve 20 in which the cleavage groove was formed, it can suppress that an operating pressure fluctuates due to the temperature change of the case 11.
（３）ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂと、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂと、のうち、蓋体１４の表面１４ａの外周部分と裏面１４ｂの外周部分とを除く部分にニッケルめっき処理を行うため、ケース１１の蓋体１４の両面の大部分にニッケルめっき層２４，２５が形成される。これにより、例えばケース１１の蓋体１４の片面にのみニッケルめっき層２４，２５を形成する場合と比較してマスキングを施す部分を少なくすることができるため、ニッケルめっき層２４，２５の形成工程を簡略化させることができる。 (3) Outer peripheral portion of the front surface 14a of the lid body 14 and outer peripheral surface of the rear surface 14b among the front surface 14a and the rear surface 14b of the lid body 14 of the case 11 and the front surface 21a and the rear surface 21b of the valve body 21 of the pressure release valve 20 Since nickel plating is performed on the portion excluding the portion, nickel plating layers 24 and 25 are formed on most of both surfaces of the lid 14 of the case 11. Thus, for example, the portion to be masked can be reduced as compared with the case where the nickel plating layers 24 and 25 are formed only on one surface of the lid 14 of the case 11. It can be simplified.
（４）中間層４４，４５が下地処理層として機能することにより、圧力開放弁２０にニッケルめっき層２４，２５を形成しやすくすることができる。尚、この実施形態ではニッケルめっき処理及びジルコンめっき処理が行われることにより、圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂにニッケルめっき層２４，２５と中間層４４，４５といった２層のめっき層がある。こうした２層のめっき層は、クラッド材のように異なる金属を張り合わせてなる層とは技術的に区別されるものである。 (4) Since the intermediate layers 44 and 45 function as a base treatment layer, the nickel plating layers 24 and 25 can be easily formed on the pressure release valve 20. In this embodiment, nickel plating treatment and zircon plating treatment are performed, so that two layers such as nickel plating layers 24 and 25 and intermediate layers 44 and 45 are formed on the front surface 21a and the rear surface 21b of the valve body 21 of the pressure release valve 20. There is a plating layer. Such two plating layers are technically distinguished from layers formed by bonding different metals such as a clad material.
（５）ケース１１の蓋体１４及び圧力開放弁２０へのニッケルめっき処理及びジルコンめっき処理に際して、蓋体１４とケース本体１３との接合部１４ｃとして機能する蓋体１４の裏面１４ｂの外周部分にマスキングを施している。このため、この蓋体１４の裏面１４ｂの外周部分にはニッケルめっき層２４，２５や中間層４４，４５が形成されない。したがって、ケース１１のケース本体１３と蓋体１４とが溶接される際に、ニッケルめっき層２４，２５や中間層４４，４５が異物となってケース１１のケース本体１３と蓋体１４との接合部１４ｃの接合が弱くなることが抑制される。 (5) In the nickel plating process and the zircon plating process on the lid body 14 and the pressure release valve 20 of the case 11, the outer peripheral portion of the back surface 14 b of the lid body 14 that functions as the joint 14 c between the lid body 14 and the case body 13. Masking is applied. For this reason, the nickel plating layers 24 and 25 and the intermediate layers 44 and 45 are not formed on the outer peripheral portion of the back surface 14 b of the lid body 14. Therefore, when the case main body 13 and the lid body 14 of the case 11 are welded, the nickel plating layers 24 and 25 and the intermediate layers 44 and 45 become foreign matters to join the case main body 13 and the lid body 14 of the case 11. It is suppressed that the joint of the part 14c becomes weak.
（６）圧力開放弁２０の弁体２１の表面２１ａに交差溝３１、弧状溝３２，３３、及び直線状溝３４，３５といった開裂溝を形成してから、ケース１１の蓋体１４及び圧力開放弁２０へのニッケルめっき処理及びジルコンめっき処理を行っている。仮に、ニッケルめっき処理後やジルコンめっき処理後の圧力開放弁２０の弁体２１の表面２１ａに開裂溝を形成するようにすると、開裂溝の形成部分のニッケルめっき層２４，２５や中間層４４，４５が剥がれるおそれがあるが、本実施形態ではこうした問題が生じることを抑制することができる。 (6) After forming a cleavage groove such as a cross groove 31, arc-shaped grooves 32, 33, and linear grooves 34, 35 on the surface 21a of the valve body 21 of the pressure relief valve 20, the lid 14 of the case 11 and the pressure relief. Nickel plating treatment and zircon plating treatment are performed on the valve 20. If a cleavage groove is formed on the surface 21a of the valve body 21 of the pressure release valve 20 after the nickel plating process or the zircon plating process, the nickel plating layers 24 and 25 and the intermediate layer 44 in the formation part of the cleavage groove are formed. Although 45 may peel off, in this embodiment, it can suppress that such a problem arises.
尚、上述の実施形態は以下のように変更して実施することもできる。
○ ケース１１の蓋体１４の表面１４ａの外周部分にニッケルめっき層２４や中間層４４が形成されていても接合部１４ｃの接合への影響が小さい場合には、蓋体１４の表面１４ａの外周部分へのマスキングを省略してもよい。
The above-described embodiment can be modified as follows.
○ Even if the nickel plating layer 24 or the intermediate layer 44 is formed on the outer peripheral portion of the surface 14a of the lid 14 of the case 11, the outer periphery of the surface 14a of the lid 14 is small when the influence on the bonding of the bonding portion 14c is small. Masking on the part may be omitted.
○ 中間層４４，４５の材料は、銅等、アルミニウム及びニッケルと接合しやすい性質を有するジルコン以外の材料に変更してもよい。
○ ニッケルめっき層２４，２５や中間層４４，４５を形成するためのめっき処理を、電気めっきにより行うようにしてもよい。
The material of the intermediate layers 44 and 45 may be changed to a material other than zircon that has a property of easily joining to aluminum and nickel such as copper.
O You may make it perform the plating process for forming the nickel plating layers 24 and 25 and the intermediate | middle layers 44 and 45 by electroplating.
○ ケース１１の蓋体１４は、ケース本体１３との接合部１４ｃにニッケルめっき層２４，２５や中間層４４，４５を有していてもよい。但し、接合部１４ｃの接合がニッケルめっき層２４，２５や中間層４４，４５によって低下することを抑えるためには、ニッケルめっき層２４，２５や中間層４４，４５を接合部１４ｃの一部に形成することが望ましい。 The lid 14 of the case 11 may have nickel plating layers 24 and 25 and intermediate layers 44 and 45 at a joint portion 14c with the case main body 13. However, in order to prevent the joint 14c from being lowered by the nickel plating layers 24 and 25 and the intermediate layers 44 and 45, the nickel plating layers 24 and 25 and the intermediate layers 44 and 45 are part of the joint 14c. It is desirable to form.
○ ケース１１の蓋体１４において、中間層４４，４５の形成範囲は、ケース１１の蓋体１４におけるニッケルめっき層２４，２５の形成範囲よりも狭くてもよいし、広くてもよい。但し、ケース１１の蓋体１４や圧力開放弁２０にニッケルめっき層２４，２５を形成しやすくするために、ケース１１の蓋体１４において、少なくともニッケルめっき層２４，２５の全形成範囲に中間層４４，４５を設けることが望ましい。 In the lid body 14 of the case 11, the formation range of the intermediate layers 44 and 45 may be narrower or wider than the formation range of the nickel plating layers 24 and 25 in the lid body 14 of the case 11. However, in order to make it easy to form the nickel plating layers 24 and 25 on the lid 14 and the pressure release valve 20 of the case 11, at least the nickel plating layers 24 and 25 are formed in the intermediate layer in the lid 14 of the case 11. 44 and 45 are preferably provided.
○ ケース１１の蓋体１４や圧力開放弁２０において、中間層４４，４５を省略してもよい。
○ ケース１１の蓋体１４は、ケース１１の蓋体１４の表面１４ａの外周部分や蓋体１４の裏面１４ｂの外周部分よりも広い範囲にニッケルめっき層２４，２５を有しない形態としてもよい。例えば、圧力開放弁２０の弁体２１の表面２１ａや裏面２１ｂはニッケルめっき層２４，２５を有するとともに、ケース１１の蓋体１４の表面１４ａや裏面１４ｂのうち、圧力開放弁２０以外の部分はニッケルめっき層２４，２５を有しない形態としてもよい。要するに、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂに、かつ少なくとも圧力開放弁２０の弁体２１の表面２１ａ及び裏面２１ｂを含む部分に、ニッケルめっき層２４，２５を有していればよい。
In the lid body 14 and the pressure release valve 20 of the case 11, the intermediate layers 44 and 45 may be omitted.
The lid body 14 of the case 11 may be configured not to have the nickel plating layers 24 and 25 in a wider range than the outer peripheral portion of the front surface 14 a of the lid body 14 of the case 11 and the outer peripheral portion of the back surface 14 b of the lid body 14. For example, the front surface 21a and the back surface 21b of the valve body 21 of the pressure release valve 20 have nickel plating layers 24 and 25, and the portions other than the pressure release valve 20 in the front surface 14a and the back surface 14b of the lid body 14 of the case 11 It is good also as a form which does not have the nickel plating layers 24 and 25. FIG. In short, it is only necessary to have nickel plating layers 24 and 25 on the front surface 14a and the back surface 14b of the lid 14 of the case 11 and at least on the portion including the front surface 21a and the back surface 21b of the valve body 21 of the pressure release valve 20. .
○ 圧力開放弁２０は、弁体２１上の表面２１ａや裏面２１ｂの一部にニッケルめっき層２４，２５を有していてもよい。但し、ケース１１の温度変化に起因する圧力開放弁２０の作動圧の変動を極力抑えるためには、圧力開放弁２０の弁体２１上の表面２１ａや裏面２１ｂのうち、大部分にニッケルめっき層２４，２５を有するようにすることが望ましい。 The pressure release valve 20 may have nickel plating layers 24 and 25 on part of the front surface 21a and the back surface 21b on the valve body 21. However, in order to suppress the fluctuation of the operating pressure of the pressure release valve 20 due to the temperature change of the case 11 as much as possible, the nickel plating layer is mostly formed on the front surface 21a and the back surface 21b on the valve body 21 of the pressure release valve 20. It is desirable to have 24,25.
○ 圧力開放弁２０の形状は円形状等、トラック形状以外の形状であってもよい。
○ 圧力開放弁２０の開裂溝の形状や配設箇所を変更してもよい。
○ 圧力開放弁２０の開裂溝の断面形状を変更してもよい。
The shape of the pressure release valve 20 may be a shape other than the track shape such as a circular shape.
O The shape and location of the cleavage groove of the pressure release valve 20 may be changed.
O The cross-sectional shape of the cleavage groove of the pressure release valve 20 may be changed.
○ 圧力開放弁２０をケース１１の蓋体１４とは別体部品とし、圧力開放弁２０をケース１１の蓋体１４に接合してもよい。接合は、例えばレーザー溶接等で行う。尚、こうした形態においても、圧力開放弁２０はアルミニウム製であることとする。 The pressure release valve 20 may be a separate part from the lid 14 of the case 11, and the pressure release valve 20 may be joined to the lid 14 of the case 11. The joining is performed by, for example, laser welding. Even in such a configuration, the pressure release valve 20 is made of aluminum.
○ 圧力開放弁２０の弁体２１は、裏面２１ｂに開裂溝を有していてもよい。
○ 圧力開放弁２０の弁体２１は、表面２１ａや裏面２１ｂの開裂溝のみにニッケルめっき層２４，２５を有していてもよい。尚、こうした形態において、圧力開放弁２０が弁体２１の表面２１ａに開裂溝を有している形態では、弁体２１の表面２１ａでは開裂溝にのみニッケルめっき層２４を有することとなる。また、圧力開放弁２０が弁体２１の裏面２１ｂに開裂溝を有している形態では、弁体２１の裏面２１ｂでは開裂溝にのみニッケルめっき層２５を有することとなる。
The valve body 21 of the pressure release valve 20 may have a cleavage groove on the back surface 21b.
The valve body 21 of the pressure release valve 20 may have nickel plating layers 24 and 25 only in the cleavage grooves on the front surface 21a and the back surface 21b. In such a form, when the pressure release valve 20 has a cleavage groove on the surface 21a of the valve body 21, the surface 21a of the valve body 21 has the nickel plating layer 24 only in the cleavage groove. Further, in the form in which the pressure release valve 20 has the cleavage groove on the back surface 21 b of the valve body 21, the back surface 21 b of the valve body 21 has the nickel plating layer 25 only in the cleavage groove.
○ 圧力開放弁２０の弁体２１の開裂溝の形成を省略してもよい。この形態では、ケース１１の蓋体１４の表面１４ａ及び裏面１４ｂの、少なくとも圧力開放弁２０の弁体２１上の表面２１ａ及び裏面２１ｂの一部にニッケルめっき層２４，２５を形成する。 O Formation of the cleavage groove of the valve body 21 of the pressure release valve 20 may be omitted. In this embodiment, nickel plating layers 24 and 25 are formed on at least part of the front surface 21a and the rear surface 21b of the pressure relief valve 20 on the front surface 14a and the rear surface 14b of the lid 14 of the case 11.
○ ケース１１の蓋体１４は、表面１４ａ及び裏面１４ｂのいずれか一方の面にのみニッケルめっき層２４，２５を有していてもよい。尚、ケース１１内の圧力が高くなると、圧力開放弁２０の弁体２１の表面２１ａに引っ張り応力が作用するようになる。このため、圧力開放弁２０の弁体２１の表面２１ａを含む、蓋体１４の表面１４ａがニッケルめっき層２４を有するようにすることが望ましい。 The lid 14 of the case 11 may have the nickel plating layers 24 and 25 only on one of the front surface 14a and the back surface 14b. When the pressure in the case 11 increases, a tensile stress acts on the surface 21 a of the valve body 21 of the pressure release valve 20. For this reason, it is desirable that the surface 14 a of the lid body 14 including the surface 21 a of the valve body 21 of the pressure release valve 20 has the nickel plating layer 24.
○ 圧力開放弁２０は、ケース１１のケース本体１３の壁面に形成してもよい。この形態では、ケース１１のケース本体１３の壁面の表面や裏面において、少なくとも圧力開放弁２０の弁体２１上の表面２１ａや裏面２１ｂの一部にニッケルめっき層２４，２５があれば、ニッケルめっき層２４，２５の形成範囲は自由に設定可能である。 The pressure release valve 20 may be formed on the wall surface of the case body 13 of the case 11. In this embodiment, if the nickel plating layers 24 and 25 are present on at least a part of the front surface 21a and the rear surface 21b on the valve body 21 of the pressure release valve 20 on the front and rear surfaces of the wall surface of the case body 13 of the case 11, the nickel plating is performed. The formation range of the layers 24 and 25 can be freely set.
○ ニッケルめっき層２４，２５を、銅で形成された銅めっき層に変更してもよい。銅めっき層も、ニッケルめっき層２４，２５と同様に、温度変化による強度の変化が生じにくい性質を有する。このため、圧力開放弁２０が弁体２１の表面２１ａや裏面２１ｂに銅めっき層を有する場合においても、図４に示すグラフと同様にケース１１の温度が変化しても圧力開放弁２０の作動圧が低下しにくくなる。 (Circle) you may change the nickel plating layers 24 and 25 into the copper plating layer formed with copper. Similarly to the nickel plating layers 24 and 25, the copper plating layer also has a property that the strength does not easily change due to a temperature change. Therefore, even when the pressure release valve 20 has a copper plating layer on the front surface 21a and the back surface 21b of the valve body 21, the operation of the pressure release valve 20 is performed even if the temperature of the case 11 changes as in the graph shown in FIG. The pressure is less likely to decrease.
○ ケース１１の形状を変更してもよい。例えば、ケース１１は円筒型でもよい。
○ 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よい。
○ The shape of the case 11 may be changed. For example, the case 11 may be cylindrical.
The electrode assembly 12 is not limited to the laminated type, but may be a wound type in which a belt-like positive electrode and a belt-like negative electrode are wound and laminated in layers.
○ 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よい。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よい。 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よい。また、定置用の蓄電装置に適用してもよい。 (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.
１０…二次電池、１１…ケース、１２…電極組立体、１３…ケース本体、１４…蓋体、１４ａ…（蓋体の）表面、１４ｂ…（蓋体の）裏面、２０…圧力開放弁、２１…弁体、２１ａ…（弁体の）表面、２１ｂ…（弁体の）裏面、２４，２５…ニッケルめっき層、３１…交差溝、３２，３３…弧状溝、３４，３５…直線状溝、３６，３７…直線溝、４４，４５…中間層。 DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11 ... Case, 12 ... Electrode assembly, 13 ... Case main body, 14 ... Lid body, 14a ... Surface of (lid body), 14b ... Back surface (of lid body), 20 ... Pressure release valve, DESCRIPTION OF SYMBOLS 21 ... Valve body, 21a ... (Valve body) surface, 21b ... (Valve body) back surface, 24, 25 ... Nickel plating layer, 31 ... Crossing groove, 32, 33 ... Arc-shaped groove, 34, 35 ... Linear groove 36, 37 ... straight grooves, 44, 45 ... intermediate layers.
Claims (5)
前記圧力開放弁はアルミニウム製であり、
前記圧力開放弁を有する前記ケースの壁面の、少なくとも前記圧力開放弁上の面の一部にはめっき層があり、
前記めっき層はニッケルめっき層又は銅めっき層であり、
前記めっき層は、前記圧力開放弁を有する前記ケースの壁面の両面に、かつ少なくとも前記圧力開放弁を含む部分にあることを特徴とする蓄電装置。 In a power storage device comprising a case in which an electrode assembly and an electrolytic solution are accommodated, and having a pressure release valve on the wall surface of the case for releasing the pressure in the case to the outside of the case,
The pressure relief valve is made of aluminum;
The wall surface of the case having the pressure release valve has a plating layer on at least a part of the surface on the pressure release valve,
The plating layer is Ri nickel plating layer or copper plating layer der,
The power storage device according to claim 1, wherein the plating layer is provided on both surfaces of the wall surface of the case having the pressure release valve and at least in a portion including the pressure release valve .
前記めっき層は、前記開裂溝を含む部分にある請求項１に記載の蓄電装置。 The pressure relief valve has a cleavage groove;
The power storage device according to claim 1, wherein the plating layer is in a portion including the cleavage groove.
前記圧力開放弁を有する前記ケースの壁面の、少なくとも前記圧力開放弁を含む部分と前記ニッケルめっき層との間に下地処理層として機能する中間層がある請求項１〜請求項３のうち何れか一項に記載の蓄電装置。 The plating layer is a nickel plating layer;
Any one of claims 1 to 3 in which there is an intermediate layer serving as a surface treatment layer between the wall of the case with a pressure relief valve, the portion including at least the pressure release valve the nickel plating layer The power storage device according to one item.
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