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JP5063897B2 - Battery connection board - Google Patents

Battery connection board Download PDF

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Publication number
JP5063897B2
JP5063897B2 JP2006010056A JP2006010056A JP5063897B2 JP 5063897 B2 JP5063897 B2 JP 5063897B2 JP 2006010056 A JP2006010056 A JP 2006010056A JP 2006010056 A JP2006010056 A JP 2006010056A JP 5063897 B2 JP5063897 B2 JP 5063897B2
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Prior art keywords
connection plate
weld bead
thickness
bead portion
welding
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JP2007194035A (en
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島 一 夫 小
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Sanoh Industrial Co Ltd
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Sanoh Industrial Co Ltd
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Priority to JP2006010056A priority Critical patent/JP5063897B2/en
Priority to PCT/JP2007/050686 priority patent/WO2007083697A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Description

本発明は、組電池の接続板に係り、特に、銅を材料とする接続板であっても、溶接強度を良好に溶接することができる組電池の接続板に関する。   The present invention relates to an assembled battery connection plate, and more particularly, to an assembled battery connection plate that can be welded with good welding strength even if the connection plate is made of copper.

二次電池からなる電池セルを直列または並列につないだ組電池は、電動式自転車、ハイブリッド車をはじめとして、さまざまな用途に広く利用されている。そして近年では、バッテリの高容量化、高密度化が急速に進んでいる。   A battery pack in which battery cells including secondary batteries are connected in series or in parallel is widely used for various applications including electric bicycles and hybrid vehicles. In recent years, battery capacity and density have been rapidly increasing.

この種の組電池では、電池セル同士を直列または並列に接続するには、帯状の接続板が用いられており、この接続板は抵抗溶接により溶接されている。そこで、図７に従来の接続板を示す。   In this type of battery pack, a strip-shaped connection plate is used to connect battery cells in series or in parallel, and this connection plate is welded by resistance welding. FIG. 7 shows a conventional connecting plate.

図７において、参照番号１は接続板を示し、この接続板１は、帯状の金属製薄板であって、中央部２が平行にせり上がった段形状となっている。接続板１には溶接ビード部５が形成されている。この接続板１の材質は、従来は、ニッケル材、鉄の薄板にニッケルめっきを施したものや、銅板の表裏両面にニッケル薄板を接合したクラッド材等が用いられている。
このような接続板１を抵抗溶接により電池セル７に溶接する場合、図７に示すように、溶接電極６を接続板１に押し付けた状態で電流を流す。これにより、電気抵抗により発生するジュール熱により溶接ビード部５が溶け、接続板１を電池セル７に溶接することができる。 In FIG. 7, reference numeral 1 indicates a connection plate, and this connection plate 1 is a strip-shaped metal thin plate and has a step shape in which the central portion 2 rises in parallel. A weld bead portion 5 is formed on the connection plate 1. Conventionally, the connecting plate 1 is made of a nickel material, a thin iron plate plated with nickel, or a clad material in which a nickel thin plate is bonded to both front and back surfaces of a copper plate.
When such a connection plate 1 is welded to the battery cell 7 by resistance welding, a current is passed in a state where the welding electrode 6 is pressed against the connection plate 1 as shown in FIG. Thereby, the weld bead part 5 is melted by the Joule heat generated by the electric resistance, and the connection plate 1 can be welded to the battery cell 7.

しかしながら、従来の接続板１では、溶接ビード部５は、図８または図９に示すような形状になっている。図８に示す溶接ビード部５は、半球型の溶接ビード部で、図９に示す溶接ビード部５は、断面形状が台形型の溶接ビード部である。   However, in the conventional connection plate 1, the weld bead portion 5 has a shape as shown in FIG. 8 or FIG. The weld bead portion 5 shown in FIG. 8 is a hemispherical weld bead portion, and the weld bead portion 5 shown in FIG. 9 is a trapezoidal weld bead portion.

従来の溶接ビード部５は、接続板１の母材と同じ材料である上に、母材の肉厚ａも溶接ビード部５の肉厚ｂも同じ（ａ＝ｂ）であるので、接続板１の母材が銅のような電導性の高い材料の場合、ニッケルや、鉄などの銅よりも固有抵抗の高い材料を用いた接続板に較べて、溶接時の発熱が少なく、溶接ビード部５の溶け込み量が少なく、溶接強度の点で弱くなる。   The conventional weld bead portion 5 is made of the same material as the base material of the connection plate 1, and the thickness a of the base material and the thickness b of the weld bead portion 5 are the same (a = b). When the base material of 1 is a highly conductive material such as copper, heat generated during welding is less than that of a connection plate using a material having a higher specific resistance than copper such as nickel or iron, and the weld bead portion. The amount of penetration of 5 is small and weak in terms of welding strength.

このような銅の接続板を溶接する場合の弱点を補うため、溶接電流を大きくして溶接ビード部発熱量を増大させることが考えられる。しかし、発熱量の増大により、電池本体が溶けて穴が開いたり、溶接機の電極寿命の低下などの不具合が生じるので、溶接電流はあまり大きくはできない。   In order to make up for the weak point when welding such a copper connection plate, it is conceivable to increase the welding bead heat generation amount by increasing the welding current. However, the increase in the amount of heat generated causes problems such as melting of the battery body and opening of holes and a decrease in the electrode life of the welding machine, so that the welding current cannot be increased too much.

そこで、本発明の目的は、前記従来技術の有する問題点を解消し、銅などの固有抵抗の小さく電導性の高い材料を用いても、溶接電流を過剰に上げることなく、電池と接続板の十分な溶接強度を確保することを可能とする組電池の接続板を提供することにある。   Therefore, an object of the present invention is to solve the problems of the prior art, and even when using a material having a small specific resistance and high conductivity such as copper, the battery and the connection plate are not excessively increased without increasing the welding current. An object of the present invention is to provide a battery pack connecting plate that can secure a sufficient welding strength.

前記の目的を達成するために、本発明は、複数の電池セルを接続板で接続した組電池において接続板本体の溶接部分に溶接ビード部を有する接続板であって、銅を材料に前記接続板本体を形成するとともに、前記溶接ビード部の全体に接続板本体の厚みよりも薄くかつその厚さが接続板本体の厚さの４０〜９０％である薄肉部を形成することにより、接続板本体よりも電気抵抗が高い発熱部を設けたことを特徴とするものである。 In order to achieve the above object, the present invention provides a connection plate having a weld bead portion in a welded portion of a connection plate body in a battery pack in which a plurality of battery cells are connected by a connection plate, wherein copper is connected to the material. to form a plate body, by the entire connection plate thin Ku and its thickness than the thickness of the body of the weld bead portion to form a thin portion 40 to 90% of the thickness of the connection plate main body, connected A heat generating portion having a higher electrical resistance than the plate body is provided.

また、本発明では、この薄肉部は、前記溶接ビード部を形成する凹部の周囲に形成された段差部を含むようにしてもよい。   Moreover, in this invention, you may make it this thin part contain the level | step-difference part formed in the circumference | surroundings of the recessed part which forms the said weld bead part.

また、本発明では、薄肉部の厚さは、接続板本体の厚さの４０〜９０％であることが好ましい。そして、接続板本体は母材が銅を主材料とすることができる。   Moreover, in this invention, it is preferable that the thickness of a thin part is 40 to 90% of the thickness of a connection plate main body. The main body of the connection plate body can be copper.

本発明によれば、銅などの固有抵抗の小さく電導性の高い材料を用いても、溶接電流を過剰に上げることなく、電池と接続板の十分な溶接強度を確保することが可能となる。   According to the present invention, it is possible to ensure a sufficient welding strength between the battery and the connection plate without excessively increasing the welding current even when a material having a small specific resistance such as copper and a high conductivity is used.

以下、本発明による組電池の接続板の一実施形態について、添付の図面を参照しながら説明する。
第１実施形態
図１は、本発明の第１実施形態による組電池の接続板を示す図である。
接続板１０は、帯状の金属製薄板であって、図１に示すように、接続板１０の両側短辺の中央からは、スリット１２が長辺と平行に中央位置まで延びて、そこで終端しており、これらのスリット１２によって接続板１０の本体は２分割され接続部１３でつながっている形状になっている。このような接続板１０では短辺側に近い位置で、スリット１２の両側に複数の溶接ビード部１４が形成されている。これらの溶接ビード部１４は、エンボス加工により、円形状にくぼんだ凹部（反対側の面からみると凸部）を加工することによって形成されている。なお、この実施形態では、接続板１０には、母材の材料に銅が用いられている。接続板１０の素材については、銅板の他、ニッケル材、銅を材料として表裏両面にニッケル薄板を接合したクラッド材等を用いることができる。 Hereinafter, an embodiment of a connection plate for a battery pack according to the present invention will be described with reference to the accompanying drawings.
First embodiment
FIG. 1 is a view illustrating a connection plate of a battery pack according to a first embodiment of the present invention.
The connection plate 10 is a strip-shaped metal thin plate. As shown in FIG. 1, the slit 12 extends from the center of the short sides on both sides of the connection plate 10 to the central position in parallel with the long side and terminates there. The main body of the connection plate 10 is divided into two parts by these slits 12 and connected by a connection part 13. In such a connection plate 10, a plurality of weld bead portions 14 are formed on both sides of the slit 12 at a position close to the short side. These weld bead portions 14 are formed by processing a concave portion (a convex portion when viewed from the opposite surface) recessed in a circular shape by embossing. In this embodiment, the connection plate 10 is made of copper as a base material. As for the material of the connection plate 10, in addition to a copper plate, a nickel material, a clad material in which a nickel thin plate is bonded to both front and back surfaces using copper can be used.

次に、図２は、接続板１０に形成されている溶接ビード部１４の断面を示す図である。図２において、この実施形態による接続板１０では、溶接ビード部１４の全体が本体の厚さａよりも薄い厚さｂをもつ薄肉部に加工されている。この図２に示した溶接ビード部１４は、接続板１０の一方の面からすり鉢形にくぼんで凹部を形成し、他方の面側に丸く突き出た形状になっており、底の部分は湾曲している。溶接するときには、底の部分が電池セルに当接する。そして、溶接ビード部１４を形成する凹部の周囲を囲むように段差部１５が形成されており、この段差部１５の部分を含む溶接ビード部１４全体の厚さが均一にｂになっている。   Next, FIG. 2 is a view showing a cross section of the weld bead portion 14 formed on the connection plate 10. In FIG. 2, in the connection plate 10 according to this embodiment, the entire weld bead portion 14 is processed into a thin portion having a thickness b smaller than the thickness a of the main body. The weld bead portion 14 shown in FIG. 2 is formed in a mortar shape from one surface of the connection plate 10 to form a recess, and has a shape protruding in a round shape on the other surface side, and the bottom portion is curved. ing. When welding, the bottom part contacts the battery cell. And the level | step-difference part 15 is formed so that the circumference | surroundings of the recessed part which forms the weld bead part 14 may be enclosed, and the thickness of the whole weld bead part 14 including the part of this level | step-difference part 15 is uniformly b.

次に、以上のような接続板１０を電池セルに溶接する場合の手順について、図３、図４を参照しながら説明する。
接続板１０を電池セル７に抵抗溶接する場合、抵抗溶接機の溶接電極６で接続板１０を電池セル７に押し付ける。このとき、図４に示すように、正極、負極のそれぞれの電極６が接続板１０の短辺側から長手方向に延びるスリット１２を間において位置決めされている。 Next, the procedure for welding the connection plate 10 as described above to the battery cell will be described with reference to FIGS.
When resistance welding the connection plate 10 to the battery cell 7, the connection plate 10 is pressed against the battery cell 7 with the welding electrode 6 of a resistance welder. At this time, as shown in FIG. 4, each of the positive electrode 6 and the negative electrode 6 is positioned with a slit 12 extending in the longitudinal direction from the short side of the connection plate 10.

図３において、そのまま電極６での加圧を維持したまま通電すると、この通電により生じる熱によって、溶接ビード部１４が溶融するので、接続板１０を電池セル７に溶接することができる。
本実施形態の接続板１０では、溶接ビード部１４の全体が薄肉部になっており、この溶接ビード部１４全体で接続板１０本体の母材の電気抵抗よりも電気抵抗が高い部分を形成しているので、溶接時のジュール熱の発生がより増大し、母材が銅のような固有抵抗の小さな材料でも、局所的に抵抗を上げ、溶接電流値を過剰に上げることなく、安定した溶接を行うことができる。しかも、溶接ビード部１４の周囲に段差部１５を形成することにより、薄肉部の面積が拡大し、より広い面積で発熱が得られる利点がある。 In FIG. 3, when energization is performed while maintaining the pressurization at the electrode 6, the weld bead portion 14 is melted by the heat generated by the energization, so that the connection plate 10 can be welded to the battery cell 7.
In the connection plate 10 of the present embodiment, the entire weld bead portion 14 is a thin-walled portion, and the entire weld bead portion 14 forms a portion having an electrical resistance higher than that of the base material of the connection plate 10 main body. Therefore, the generation of Joule heat during welding is further increased, and even if the base material is a material with a small specific resistance such as copper, the resistance is increased locally and stable welding is performed without excessively increasing the welding current value. It can be performed. Moreover, by forming the step portion 15 around the weld bead portion 14, there is an advantage that the area of the thin-walled portion is enlarged, and heat is generated in a wider area.

ここで、図５は、溶接ビード部１４の厚さｂと接続板１０の本体の板厚ａとの比（ｂ／ａ）を変えて接続板１０の溶接を行い、溶接強度の測定結果を示すグラフである。接続板１０には、本体の厚さ０．５mmのものを用いた。   Here, FIG. 5 shows the result of welding strength measurement by changing the ratio (b / a) of the thickness b of the weld bead portion 14 and the plate thickness a of the main body of the connection plate 10 and welding strength. It is a graph to show. As the connection plate 10, a main body having a thickness of 0.5 mm was used.

この図５のグラフからわかるように、引張強度は厚さの比（ｂ／ａ）が６０〜８０％の範囲で最大になり、４０％を以下では減少していく。このような傾向から、接続板１０の本体の厚さａに対して溶接ビード部１４の厚さｂを薄くすることで抵抗が増大し、溶接性は向上するが、溶接ビード部１４の厚さｂが薄すぎると、ビード回りでの母材破断により溶接強度は弱くなる。逆に、溶接ビード部１４の厚さｂが厚すぎると、抵抗は上がらず発熱が小さくなり溶接性は悪くなる。厚さの比（ｂ／ａ）が１００％の場合、つまり溶接ビード部１４の厚さが本体と同じになっている従来の溶接板と較べると、全体として厚さの比（ｂ／ａ）は４０〜９０％であれば従来よりも良好な溶接強度が得られることがわかる。   As can be seen from the graph of FIG. 5, the tensile strength becomes maximum when the thickness ratio (b / a) is in the range of 60 to 80%, and decreases below 40%. From such a tendency, the resistance is increased and the weldability is improved by reducing the thickness b of the weld bead portion 14 with respect to the thickness a of the main body of the connection plate 10, but the thickness of the weld bead portion 14 is improved. If b is too thin, the weld strength becomes weak due to the fracture of the base material around the bead. On the other hand, if the thickness b of the weld bead portion 14 is too thick, the resistance does not increase and the heat generation becomes small and the weldability deteriorates. When the thickness ratio (b / a) is 100%, that is, when compared with a conventional welded plate in which the thickness of the weld bead portion 14 is the same as that of the main body, the overall thickness ratio (b / a) It can be seen that a weld strength better than that of the prior art can be obtained at 40 to 90%.

なお、図２（ａ）は、本実施形態における接続板１０に形成される溶接ビード部１４の変形例を示す断面図である。この図２（ｂ）に示す溶接ビード部１４では、段差部１５の位置および形状は図２（ａ）の溶接ビード部１４と同様であるが、底１６の形状が直線的に角張っている例である。
第２実施形態
次に、本発明の第２実施形態について、図６を参照して説明する。
上述した第１実施形態は、溶接ビード部１４の周囲に段差部１５を形成した実施形態であったが、図６の実施形態は、溶接ビード部１４に段差部１５を形成せずに全体または一部を肉厚の薄い薄肉部とした例である。 FIG. 2A is a cross-sectional view showing a modification of the weld bead portion 14 formed on the connection plate 10 in the present embodiment. In the weld bead portion 14 shown in FIG. 2B, the position and shape of the step portion 15 are the same as those of the weld bead portion 14 in FIG. 2A, but the shape of the bottom 16 is linearly square. It is.
Second embodiment
Next, a second embodiment of the present invention will be described with reference to FIG.
The first embodiment described above is an embodiment in which the step portion 15 is formed around the weld bead portion 14, but the embodiment of FIG. This is an example in which a part is a thin part with a small thickness.

図６（ａ）に示す溶接ビード部１４は、接続板１０の本体の肉厚よりも全体的に薄くなっている。これに対して、図６（ｂ）に示す溶接ビード部１４では、底に向かって徐々に肉厚が薄くなり、底１６の部分で最も薄くなっている。図６（ｃ）に示す溶接ビード１４では、全体が均一の薄肉部となっている点は、図６（ａ）の溶接ビード部１４と同様であるが、底１６が角張った形状になっている。   The weld bead portion 14 shown in FIG. 6A is generally thinner than the thickness of the main body of the connection plate 10. On the other hand, in the weld bead portion 14 shown in FIG. 6B, the thickness gradually decreases toward the bottom, and is the thinnest at the bottom 16 portion. The weld bead 14 shown in FIG. 6C is the same as the weld bead 14 shown in FIG. 6A in that the whole is a uniform thin part, but the bottom 16 has an angular shape. Yes.

以上のように溶接ビード部１４を薄肉部とする形状には様々なものがあるが、いずれも電気抵抗を高められるので、溶接電流を上げることなく、より大きな発熱により安定した溶接が可能となる。   As described above, there are various shapes in which the weld bead portion 14 is a thin-walled portion, but since any of them can increase the electrical resistance, stable welding can be performed with greater heat generation without increasing the welding current. .

以上、本発明について、好適な実施形態を挙げて説明したが、本発明では、上述した第１実施形態と第２実施形態とは異なり、溶接ビード部１４の材料を接続板１０の母材とは異種材料を用いるようにしてもよい。その場合、溶接ビード部１４は、接続板１０の母材が銅であれば、銅よりも固有抵抗の高い材料例えば、ニッケル、アルミニウム、またはそれらの合金から形成することができる。また、溶接ビード部１４を母材と同じ銅にする替わりに、表面にＮｉめっき被膜で被覆することにより、抵抗値を母材よりも高めるようにしてもよい。さらに、本発明では、接続板１０をセル電池の直列接続、並列接続、直列と並列の組み合わせのいずれにも利用できることはいうまでもない。   As described above, the present invention has been described with reference to a preferred embodiment. However, in the present invention, unlike the first embodiment and the second embodiment described above, the material of the weld bead portion 14 is the base material of the connection plate 10. May use different materials. In that case, if the base material of the connection plate 10 is copper, the weld bead portion 14 can be formed of a material having higher specific resistance than copper, for example, nickel, aluminum, or an alloy thereof. Further, instead of using the same copper as the base metal for the weld bead portion 14, the resistance value may be higher than that of the base material by covering the surface with a Ni plating film. Furthermore, in this invention, it cannot be overemphasized that the connection board 10 can be utilized for any of the serial connection of a cell battery, parallel connection, and the combination of series and parallel.

本発明による組電池の接続板の第１実施形態を示し、図１（ａ）は平面図、図１（ｂ）は側面図である。FIG. 1A is a plan view and FIG. 1B is a side view showing a first embodiment of a connection plate of a battery pack according to the present invention. 第１実施形態による組電池の接続板に形成される溶接ビード部を示す横断面図である。It is a cross-sectional view which shows the weld bead part formed in the connection board of the assembled battery by 1st Embodiment. 組電池の接続板を電池セルに溶接する手順を示す図。The figure which shows the procedure of welding the connection board of an assembled battery to a battery cell. 組電池の接続板を電池セルに溶接する手順を示す図。The figure which shows the procedure of welding the connection board of an assembled battery to a battery cell. 接続板の本体の肉厚と、ビード部の厚さの比と溶接強度の関係を示すグラフである。It is a graph which shows the thickness of the main body of a connection plate, the ratio of the thickness of a bead part, and the relationship of welding strength. 第２実施形態による組電池の接続板に形成される溶接ビード部を示す横断面図である。It is a cross-sectional view which shows the weld bead part formed in the connection board of the assembled battery by 2nd Embodiment. 従来の組電池の接続板の溶接工程の説明図である。It is explanatory drawing of the welding process of the connection plate of the conventional assembled battery. 従来の組電池の接続板に形成される溶接ビード部を示す横断面図である。It is a cross-sectional view which shows the weld bead part formed in the connection plate of the conventional assembled battery. 他の従来例の組電池の接続板に形成される溶接ビード部を示す横断面図である。It is a cross-sectional view which shows the weld bead part formed in the connection board of the assembled battery of another prior art example.

符号の説明Explanation of symbols

６ 溶接電極
７ 電池セル
１０ 接続板
１２ スリット
１４ 溶接ビード部
１５ 段差部
１６ 底 6 Welding electrode 7 Battery cell 10 Connection plate 12 Slit 14 Weld bead part 15 Step part 16 Bottom

Claims (2)

複数の電池セルを接続板で接続した組電池において接続板本体の溶接部分に溶接ビード部を有する接続板であって、
銅を材料に前記接続板本体を形成するとともに、前記溶接ビード部の全体に接続板本体の厚みよりも薄くかつその厚さが接続板本体の厚さの４０〜９０％である薄肉部を形成することにより、接続板本体よりも電気抵抗が高い発熱部を設けたことを特徴とする組電池の接続板。 In the assembled battery in which a plurality of battery cells are connected by a connection plate, the connection plate has a weld bead portion in the welded portion of the connection plate body,
And forming said connecting plate body to a copper material, a thin portion in the connecting plate thin Ku and its thickness than the thickness of the body whole is 40 to 90% of the thickness of the connection plate main body of the weld bead portion An assembled battery connection plate comprising a heat generating portion having a higher electrical resistance than the connection plate body. 前記薄肉部は、前記溶接ビード部を形成する凹部の周囲に形成された段差部を含むことを特徴とする請求項１に記載の組電池の接続板。   2. The assembled battery connection plate according to claim 1, wherein the thin portion includes a stepped portion formed around a recess that forms the weld bead portion.
JP2006010056A 2006-01-18 2006-01-18 Battery connection board Expired - Fee Related JP5063897B2 (en)

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