JP4774657B2 - Inter-cell connection method for lead-acid batteries - Google Patents
Inter-cell connection method for lead-acid batteries Download PDFInfo
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- JP4774657B2 JP4774657B2 JP2001275971A JP2001275971A JP4774657B2 JP 4774657 B2 JP4774657 B2 JP 4774657B2 JP 2001275971 A JP2001275971 A JP 2001275971A JP 2001275971 A JP2001275971 A JP 2001275971A JP 4774657 B2 JP4774657 B2 JP 4774657B2
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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
【０００１】
【発明の属する技術分野】
本発明は鉛蓄電池のセル間接続方法に関するものである。
【０００２】
【従来の技術】
従来の鉛蓄電池のセル間接続方法は、図３に示すように電槽９のセル室６を仕切る隔壁７に貫通孔８を設け、該貫通孔８を介して、隣り合うセル室６，６内の極板群１２，１２のストラップ１０，１０に立設された互いに反対極性のセル間接続体１１，１１を向かい合わせて配置し、これら接続体１１，１１を背面よりセル間接続装置の電極チップ１，１で貫通孔８内に押し込み、これら接続体１１，１１が一定の接触面積を得た時点で電極チップ１，１に通電して溶接する方法（以下、抵抗溶接という）であった。
【０００３】
通常、この方法を採用する場合は、電槽隔壁７に設けられた貫通孔８の形状が真円形であり、電極チップ１の突起３の形状も図４に示すように真円形であった。しかしながら、最近、電池の容積効率向上の要求が高まり、接続体１１の高さ寸法を小さくして、その分だけ極板１３，１４の作用面の高さを高くする工夫がなされている。その一つに、電極チップ１の突起３の形状を真円形から図５のように上下方向に短い長円形にし、電槽隔壁７の貫通孔８の形状も真円形から長円形にしたものがある。なお、この時の長円形の断面積は、真円形の断面積と変わらないようにしてある。
【０００４】
このようにすると、真円形の直径と長円形の短直径（上下方向の長さ）との差の分だけ接続体１１の高さ寸法を短くでき、その分だけ極板１３，１４の作用面の高さを高くできるので、同一容積における電池の放電容量を増加できる。なお、貫通孔８の形状は楕円形状でもよく、電極チップ１の形状は貫通孔８の形状と同一で、貫通孔８の断面積に対して接続体１１の接触面積が３０〜６０％になるように直径を決めている。
【０００５】
【発明が解決しようとする課題】
しかしながら上記のように構成された鉛蓄電池においてセル間接続を行うと、電極チップ１で接続体１１を貫通孔８内に押し込んだ後、抵抗溶接する際に、抵抗熱で溶融し膨張した鉛が貫通孔内の空間を満たすが、その後の冷却過程で前記溶融した鉛が収縮固化して貫通孔内に図６に示すような空孔４が生じ、最悪の場合、溶接不良が生じるという問題点が発生した。
【０００６】
本発明は、上記問題点に鑑みてなされたものであって、その目的とするところは、容積効率の優れた鉛蓄電池を作製でき、かつ良好なセル間接続状態を得ることができる鉛蓄電池のセル間接続法を提供することにある。
【０００７】
【課題を解決するための手段】
本発明は、以上の課題を解決する為、電槽の隔壁を介して隣接する極板群の互いに反対極性のセル間接続体を該接続体の背面より電極チップで押圧して該隔壁の貫通孔内で該接続体同士を接触させ抵抗溶接する鉛蓄電池のセル間接続法において、前記貫通孔は上下方向が水平方向より短く形成され、前記接続体は溶接後の前記貫通孔の内径寸法が溶接前の前記内径寸法より大きくなるように、先端が平坦で傾斜をもつ長円形の錐形の突起を有し、前面が上方ほど正面側に傾斜した電極チップにより押圧されて抵抗溶接されることを特徴とする。そして、前記接続体の前記電極チップにより押圧される力が０．８０ＭＰａ以上であることが望ましい。
【０００８】
これにより、電極チップ１で接続体１１を押圧した後、抵抗溶接する際に、接続体１１の鉛が抵抗熱で溶融し膨張した後、冷却過程で前記溶融した鉛が収縮固化しても、電極チップ１に十分な押圧力を加えることで、電極チップ１が貫通孔を上下方向に押し広げながら押圧方向に進行するので、溶接後に貫通孔内に空孔が発生するのを防止することができる。その結果、良好なセル間接続状態を得ることができ、接続体の高さ寸法を小さくでき、容積効率の優れた鉛蓄電池の製造法を提供できる。
【０００９】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づき説明する。
【００１０】
先ず、図２に示すような６個のセル室６を有し、隣り合うセル室６，６を仕切る隔壁７に上下方向が水平方向より短い長円形の貫通孔８を有する電槽９を準備する。
【００１１】
次に、図３のように電槽９の各セル室６に、同極性の極板同士をストラップ１０で連結し、該ストラップ１０の一端に接続体１１を立設した極板群１２を収納する。この際、隣り合うセル室６，６のセル間接続体１１，１１が隔壁７の貫通孔８を介して互いに反対極性になるように収納する。なお、１３は正極板、１４は負極板である。
【００１２】
次に、貫通孔８を介して向かい合うセル間接続体１１，１１の背面に、電極チップ１，１の先端を当て、アーム２，２によりそれぞれの電極チップ１，１を互いに近づけて、セル間接続体１１，１１を貫通孔８内に押し込んで行く。そして、所定の時間が経過したら該アームの移動を止め、電極チップ１、１に電流を流して貫通孔８内の接続体１１、１１同士を抵抗溶接してセル間接続を完成する。
【００１３】
ここで、電極チップの形状は、図５に示すように、先端が平坦で傾斜をもつ錐形の突起３を有し、アームに近づくに従い太くなっている。突起３は、上下方向が水平方向より短く長円形をなし、固定座１６は真円の平滑面からなる。さらに、前記電極チップ１は、電極チップ１の前面が上方ほど正面側に傾斜しており、背面でアーム２と固定されている。
【００１４】
次に、実施形態の方法で電極チップの押圧力を変えてセル間接続を実施し、セル間接続後、それぞれのセル間接続体（電池１個につき５か所）を引き剥がし、貫通孔および溶接面の状態から空孔発生による溶接不良率を調査した。その結果を図１に示す。
【００１５】
図１の結果から、押圧力が０．８０ＭＰａ未満のときは、押圧力の増加とともに不良率は減少するものの、貫通孔の内周と溶接面の上下部間での空孔発生による不良率は高かった。一方、押圧力が０．８０ＭＰａ以上になると、隣接するセル間接続体の溶接面および貫通孔の形状がほぼ同一になり空孔の発生による溶接不良率は０．０１％以下と問題のないレベルに達した。以上の結果から、０．８０ＭＰａ以上の押圧力でセル間接続することにより、隣接するセル間接続体１１，１１の溶接面１５と貫通孔８の形状がほぼ同一になり、溶接不良を大幅に抑制することができ、良好なセル間接続部が得られる。
【００１６】
なお、本実施形態では０．８０ＭＰａ以上押圧力でセル間接続することにより溶接不良を大幅に抑制することができるが、前記押圧力をさらに大きくしても、本発明の効果は同じであることから、設定値は製造ばらつきを考慮に入れた範囲を設定してその下限値を０．８０ＭＰａ以上にすればよい。また、押圧力は本実施形態で求めた値に限定されるものではなく、貫通孔の形状やセル間接続体の形状等、その設計仕様により最適な押圧力は変わるので、各仕様にあわせてその最適条件を設定してセル間接続すれば、本発明の効果が得られる。
【００１７】
【発明の効果】
以上詳述したように、本発明によれば、溶接後の貫通孔の内径寸法が、溶接前の貫通孔の内径寸法より大きくなるように前記接続体を電極チップで押圧してセル間接続するので、セル間接続部の溶接部に空孔が生じず、良好な接続が得られる。また、本発明によれば、セル間接続部の形状を上下方向が水平方向より短い長円形にできるので、セル間接続体の高さを低くでき、容積効率に優れた鉛蓄電池を提供できる。
【図面の簡単な説明】
【図１】電極チップの押圧力と貫通孔における不良率との関係を示すグラフである。
【図２】本発明のセル間接続に係る電槽の斜視図である。
【図３】従来および本発明のセル間接続方法の説明図である。
【図４】（イ）は従来の電極チップを示す要部側面図であり、（ロ）は同要部正面図である。
【図５】（イ）は本発明の実施形態に係る電極チップを示す要部側面図であり、（ロ）は同要部正面図である。
【図６】従来の方法による溶接面に空孔が発生した時の状態を示す断面図である。
【符号の説明】
１ 電極チップ
７ 隔壁
８ 貫通孔
９ 電槽
１１ セル間接続体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for connecting cells of a lead storage battery.
[0002]
[Prior art]
As shown in FIG. 3, a conventional lead-acid battery inter-cell connection method is provided with a through hole 8 in a partition wall 7 that partitions the cell chamber 6 of the battery case 9, and the adjacent cell chambers 6, 6 through the through hole 8. The inter-cell connecting bodies 11 and 11 of opposite polarities standing on the straps 10 and 10 of the inner electrode plate groups 12 and 12 are arranged facing each other, and these connecting bodies 11 and 11 are arranged on the back of the inter-cell connecting apparatus from the back. This is a method (hereinafter referred to as resistance welding) in which the electrode tips 1 and 1 are pushed into the through-hole 8 and when the connection bodies 11 and 11 obtain a certain contact area, the electrode tips 1 and 1 are energized and welded. It was.
[0003]
Usually, when this method is adopted, the shape of the through-hole 8 provided in the battery case partition wall 7 is a perfect circle, and the shape of the protrusion 3 of the electrode tip 1 is also a perfect circle as shown in FIG. Recently, however, demands for improving the volumetric efficiency of the battery have increased, and the height of the connection body 11 is reduced, and the height of the working surface of the electrode plates 13 and 14 is increased accordingly. For example, the shape of the protrusion 3 of the electrode chip 1 is changed from a perfect circle to a short ellipse in the vertical direction as shown in FIG. 5, and the shape of the through hole 8 of the battery case partition 7 is also changed from a perfect circle to an ellipse. is there. Note that the oval cross-sectional area at this time is not different from the true circular cross-sectional area.
[0004]
In this way, the height of the connection body 11 can be shortened by the difference between the diameter of the perfect circle and the short diameter of the oval (length in the vertical direction), and the working surface of the electrode plates 13 and 14 can be reduced accordingly. Therefore, the discharge capacity of the battery in the same volume can be increased. The shape of the through hole 8 may be elliptical, the shape of the electrode tip 1 is the same as the shape of the through hole 8, and the contact area of the connection body 11 is 30 to 60% with respect to the cross-sectional area of the through hole 8. The diameter is determined as follows.
[0005]
[Problems to be solved by the invention]
However, when the inter-cell connection is performed in the lead storage battery configured as described above, the lead 11 that has been melted and expanded by resistance heat is formed when the connection body 11 is pushed into the through-hole 8 by the electrode tip 1 and then resistance welding is performed. Although the space in the through hole is filled, the molten lead shrinks and solidifies in the subsequent cooling process, resulting in a hole 4 as shown in FIG. 6 in the through hole, and in the worst case, poor welding occurs. There has occurred.
[0006]
The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a lead storage battery that can produce a lead storage battery with excellent volumetric efficiency and can obtain a good connection state between cells. It is to provide an inter-cell connection method.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention presses an inter-cell connection body of opposite polarities of adjacent electrode plate groups through an electrode chip from the back surface of the connection body through the partition wall of the battery case to penetrate the partition wall. In a lead-acid battery inter-cell connection method in which the connection bodies are brought into contact with each other in a hole and resistance welding is performed, the through hole is formed so that the vertical direction is shorter than the horizontal direction, and the connection body has an inner diameter dimension of the through hole after welding. The tip is flat and inclined with an oval cone-shaped projection that is larger than the inner diameter before welding, and the front surface is pressed by an electrode tip inclined toward the front side toward the upper side and resistance welded. It is characterized by. And it is desirable for the force pressed by the said electrode tip of the said connection body to be 0.80 Mpa or more.
[0008]
Thereby, after pressing the connection body 11 with the electrode tip 1, after the lead of the connection body 11 is melted and expanded by resistance heat when resistance welding is performed, even if the molten lead shrinks and solidifies in the cooling process, By applying a sufficient pressing force to the electrode tip 1, the electrode tip 1 advances in the pressing direction while expanding the through-hole in the vertical direction, so that it is possible to prevent holes from being generated in the through-hole after welding. it can. As a result, a good connection state between cells can be obtained, the height of the connection body can be reduced, and a method for manufacturing a lead storage battery having excellent volumetric efficiency can be provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
First, a battery case 9 having six cell chambers 6 as shown in FIG. 2 and having an oval through hole 8 whose vertical direction is shorter than the horizontal direction is prepared in a partition wall 7 that partitions adjacent cell chambers 6 and 6. To do.
[0011]
Next, as shown in FIG. 3, the electrode plates 12 having the same polarity connected to each cell chamber 6 of the battery case 9 by the strap 10 and the connection body 11 standing at one end of the strap 10 are accommodated. To do. At this time, the inter-cell connecting bodies 11, 11 of the adjacent cell chambers 6, 6 are accommodated so as to have opposite polarities through the through holes 8 of the partition walls 7. In addition, 13 is a positive electrode plate, 14 is a negative electrode plate.
[0012]
Next, the tips of the electrode chips 1, 1 are applied to the back surfaces of the inter-cell connecting bodies 11, 11 facing each other through the through-holes 8, and the electrode chips 1, 1 are brought close to each other by the arms 2, 2. The connecting bodies 11 and 11 are pushed into the through hole 8. Then, when the predetermined time has elapsed, the movement of the arm is stopped, and a current is passed through the electrode tips 1 and 1 to resistance weld the connection bodies 11 and 11 in the through hole 8 to complete the connection between cells.
[0013]
Here, as shown in FIG. 5, the shape of the electrode tip has a conical protrusion 3 having a flat tip and an inclined shape, and becomes thicker as it approaches the arm. The protrusion 3 has an elliptical shape in which the vertical direction is shorter than the horizontal direction, and the fixed seat 16 is formed of a perfect circular smooth surface. Furthermore, the electrode chip 1 is inclined to the front side as the front surface of the electrode chip 1 is upward, and is fixed to the arm 2 on the back surface.
[0014]
Next, the inter-cell connection is performed by changing the pressing force of the electrode tip by the method of the embodiment, and after the inter-cell connection, each inter-cell connection body (five places per battery) is peeled off, The weld failure rate due to the generation of holes was investigated from the state of the weld surface. The result is shown in FIG.
[0015]
From the results shown in FIG. 1, when the pressing force is less than 0.80 MPa, the defect rate decreases as the pressing force increases, but the defect rate due to void generation between the inner periphery of the through hole and the upper and lower portions of the weld surface is it was high. On the other hand, when the pressing force is 0.80 MPa or more, the shape of the welded surface and the through hole of the adjacent inter-cell connector is substantially the same, and the welding defect rate due to the generation of voids is 0.01% or less, which is not a problem level. Reached. From the above results, by connecting between cells with a pressing force of 0.80 MPa or more, the shape of the weld surface 15 of the adjacent inter-cell connector 11, 11 and the through-hole 8 are substantially the same, which greatly reduces welding defects. Therefore, a good inter-cell connection part can be obtained.
[0016]
In this embodiment, welding failure can be significantly suppressed by connecting cells with a pressing force of 0.80 MPa or more, but the effect of the present invention is the same even if the pressing force is further increased. Therefore, the set value may be set in a range that takes manufacturing variation into consideration, and the lower limit value may be set to 0.80 MPa or more. In addition, the pressing force is not limited to the value obtained in this embodiment, and the optimal pressing force varies depending on the design specifications such as the shape of the through-hole and the connection between cells, etc. The effect of the present invention can be obtained by setting the optimum conditions and connecting the cells.
[0017]
【The invention's effect】
As described above in detail, according to the present invention, the connection body is pressed with the electrode tip so that the inner diameter dimension of the through hole after welding is larger than the inner diameter dimension of the through hole before welding. As a result, no holes are formed in the welded portion of the inter-cell connecting portion, and a good connection is obtained. Furthermore, according to the present invention, the shape of the inter-cell connecting portion can be made into an oval whose vertical direction is shorter than the horizontal direction, so that the height of the inter-cell connecting body can be lowered and a lead storage battery excellent in volumetric efficiency can be provided.
[Brief description of the drawings]
FIG. 1 is a graph showing a relationship between a pressing force of an electrode tip and a defect rate in a through hole.
FIG. 2 is a perspective view of a battery case according to the connection between cells of the present invention.
FIG. 3 is an explanatory diagram of a conventional inter-cell connection method according to the present invention.
4A is a side view of a main part of a conventional electrode chip, and FIG. 4B is a front view of the main part.
FIG. 5A is a side view of a main part showing an electrode chip according to an embodiment of the present invention, and FIG. 5B is a front view of the main part.
FIG. 6 is a cross-sectional view showing a state when holes are generated on a welding surface by a conventional method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electrode chip 7 Partition 8 Through-hole 9 Battery case 11 Connection body between cells
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001275971A JP4774657B2 (en) | 2001-09-12 | 2001-09-12 | Inter-cell connection method for lead-acid batteries |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001275971A JP4774657B2 (en) | 2001-09-12 | 2001-09-12 | Inter-cell connection method for lead-acid batteries |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003086168A JP2003086168A (en) | 2003-03-20 |
| JP4774657B2 true JP4774657B2 (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001275971A Expired - Lifetime JP4774657B2 (en) | 2001-09-12 | 2001-09-12 | Inter-cell connection method for lead-acid batteries |
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| Country | Link |
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| JP (1) | JP4774657B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019203607A1 (en) * | 2019-03-18 | 2020-09-24 | Volkswagen Ag | Battery module and motor vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53114035A (en) * | 1977-03-17 | 1978-10-05 | Yuasa Battery Co Ltd | Method of manufacturing lead storage battery |
| JP3245022B2 (en) * | 1995-09-14 | 2002-01-07 | 松下電器産業株式会社 | Lead storage battery and method of manufacturing the same |
| JPH11149913A (en) * | 1997-11-18 | 1999-06-02 | Furukawa Battery Co Ltd:The | Inter-cell connection method for lead-acid battery |
| JP4884579B2 (en) * | 1999-06-16 | 2012-02-29 | パナソニック株式会社 | Lead-acid battery inter-cell connection method |
-
2001
- 2001-09-12 JP JP2001275971A patent/JP4774657B2/en not_active Expired - Lifetime
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| Publication number | Publication date |
|---|---|
| JP2003086168A (en) | 2003-03-20 |
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