JP2013097923A - Electrode lead connection body and electrode lead connection assembly - Google Patents
Electrode lead connection body and electrode lead connection assembly Download PDFInfo
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本発明は、一方の電池セルの正極リードと、隣接する他方の電池セルの正極リードとは異なる金属からなる負極リードと、を接続する電極リード接続体及び電極リード接続アセンブリに関するものである。 The present invention relates to an electrode lead connection body and an electrode lead connection assembly for connecting a positive electrode lead of one battery cell and a negative electrode lead made of a metal different from the positive electrode lead of the other adjacent battery cell.
近年、リチウムイオン二次電池に代表される非水電解質二次電池の実用化が進展している。非水電解質二次電池は鉛蓄電池など他の電池と比較して単位体積（単位質量）当たりのエネルギ出力が高いため、移動体通信機器、ノートパソコンを始め、電気自動車やハイブリッド自動車、更には太陽電池など再生可能エネルギを使用した電力の蓄電システムへの適用が進められている。 In recent years, non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries have been put into practical use. Non-aqueous electrolyte secondary batteries have higher energy output per unit volume (unit mass) than other batteries such as lead-acid batteries, so mobile communication devices, laptop computers, electric vehicles, hybrid vehicles, and solar Application to electric power storage systems using renewable energy such as batteries is underway.
こうした非水電解質二次電池の電池セルは、正極と負極との間にセパレータを配して積層構造とした電極群を作製し、これを外装体に収納した後、外装体内に電解液を封入することにより製造される。正極の基材にはＡｌが用いられ、負極の基材にはＣｕが用いられる。図１３に示すように、電池セル１３０の正極には正極リード１３１が接続されると共に負極には負極リード１３２が接続され、この正負の電極リード１３１，１３２で他の電池セル１３０や制御装置と電気的に接続される。電極リード１３１，１３２の材質としては、正極リード１３１にはＡｌが用いられ、負極リード１３２にはＣｕ又はＮｉが用いられている。 In such a non-aqueous electrolyte secondary battery cell, a separator is provided between a positive electrode and a negative electrode to produce a laminated electrode group, which is housed in an exterior body, and then an electrolyte is enclosed in the exterior body It is manufactured by doing. Al is used for the base material of the positive electrode, and Cu is used for the base material of the negative electrode. As shown in FIG. 13, a positive electrode lead 131 is connected to the positive electrode of the battery cell 130 and a negative electrode lead 132 is connected to the negative electrode, and the positive and negative electrode leads 131 and 132 are used to connect other battery cells 130 and control devices. Electrically connected. As the material of the electrode leads 131 and 132, Al is used for the positive electrode lead 131 and Cu or Ni is used for the negative electrode lead 132.
このような非水電解質二次電池は移動体通信機器など一部の機器では電池セル１３０単体で用いられるが、電気自動車など大出力が必要な機器では電池セル１３０単体の出力では当然足りず、複数の電池セル１３０を直並列接続して所望の電気エネルギを得ることになる。この場合、正極リード１３１と負極リード１３２とを接続する必要があるが、前述のように正極リード１３１にはＡｌが用いられ、負極リードにはＣｕ又はＮｉが用いられているため、異種金属同士の接合を行わなければならない。異種金属同士の接合では、金属のイオン化傾向の違いによる局部電池効果によって接合部分の腐食問題が懸念される。また、接合自体についても金属接合で一般的な抵抗溶接などではそれぞれの金属の持つ融点の違いにより、安定した接合強度を得るのは困難であるという課題がある。更に複数の電池セル１３０を組み合わせて効率良く充放電を行うためには、各電池セル１３０の状態、一般的には電圧を監視する必要があり、このための電圧監視用ケーブルの配線も各電池セル１３０間に行う必要がある。故に、電池モジュールの組立では、例えば、接続作業スペースに余裕のある電池セル１３０単体状態でＡｌ材質である正極リード１３１とＮｉ板とを超音波接合した後、Ｎｉ板と他の電池セル１３０のＮｉ材質である負極リード１３２とを抵抗溶接することで電池モジュールを完成させ、その後、各電池セル１３０間に電圧監視用ケーブルを半田付けにより配線するといったような都合３種類の異なる接合方法で電池モジュールの組立を行っており煩雑である。 Such a non-aqueous electrolyte secondary battery is used as a battery cell 130 alone in some devices such as mobile communication devices, but in a device that requires a large output such as an electric vehicle, the output of the battery cell 130 alone is naturally not sufficient. A plurality of battery cells 130 are connected in series and parallel to obtain desired electrical energy. In this case, it is necessary to connect the positive electrode lead 131 and the negative electrode lead 132. As described above, Al is used for the positive electrode lead 131 and Cu or Ni is used for the negative electrode lead. Must be joined. In the bonding of different metals, there is a concern about the corrosion problem of the bonded portion due to the local battery effect due to the difference in ionization tendency of the metal. Further, with respect to the joining itself, there is a problem that it is difficult to obtain a stable joining strength due to a difference in melting point of each metal in resistance welding or the like generally used in metal joining. Furthermore, in order to charge and discharge efficiently by combining a plurality of battery cells 130, it is necessary to monitor the state of each battery cell 130, generally the voltage, and wiring for voltage monitoring cables for this purpose is also required for each battery. Must be done between cells 130. Therefore, in assembling the battery module, for example, after the positive electrode lead 131 made of Al material and the Ni plate are ultrasonically joined in a single battery cell 130 having a sufficient connection work space, the Ni plate and the other battery cell 130 are connected. The battery module is completed by resistance welding the negative electrode lead 132 made of Ni, and then the battery is connected by three different joining methods such as wiring a voltage monitoring cable between the battery cells 130 by soldering. Assembling modules is complicated.
また、例えば特許文献１には、正極又は負極と同様の金属、即ちＡｌ又はＣｕで構成された第一部材と第二部材との重複箇所を冷間圧延により接合し、その重複箇所（接合部分）に耐食材を被覆したリード部材（電極リード）が開示されている。このリード部材によれば、機械的に十分な接合強度が得られ、且つ被覆による外気遮断で接合部分の腐食を防止することができるとされている。このリード部材を電池セルの正極リード又は負極リードに用いることで電池セル間の電極接続では同種金属同士の接合となるため、局部電池効果による腐食を原理的に発生させずに、例えば抵抗溶接のようなより簡便な方法を採用することが可能となる。 Further, for example, in Patent Document 1, overlapping portions between the first member and the second member made of the same metal as the positive electrode or the negative electrode, that is, Al or Cu, are joined by cold rolling, and the overlapping portion (joining portion) ) Discloses a lead member (electrode lead) coated with a corrosion-resistant material. According to this lead member, it is said that mechanically sufficient joint strength can be obtained, and corrosion of the joint portion can be prevented by blocking the outside air by covering. By using this lead member for the positive electrode lead or the negative electrode lead of the battery cell, the same type of metal is joined in the electrode connection between the battery cells, so that, for example, resistance welding can be performed without causing corrosion due to the local battery effect. Such a simpler method can be employed.
その他、例えば特許文献２には、正極リード部材としてＡｌ板にＣｕ板をレーザ溶接などで接合し、接合部分を樹脂で被覆した構造が開示されている。 In addition, for example, Patent Document 2 discloses a structure in which a Cu plate is bonded to an Al plate as a positive electrode lead member by laser welding or the like, and a bonded portion is covered with a resin.
特許文献１，２では、耐食材などによる封止が行われているが、耐食材は必ずしも部材全面を覆うことができないため、その隙間部分から腐食が進行することがあった。また、耐食材による封止は樹脂による保護膜によりなされるため、経年、使用環境に起因する劣化、機械的な接触による損傷などで接合部分が露出してしまう可能性もある。 In Patent Documents 1 and 2, sealing with a corrosion-resistant material or the like is performed. However, since the corrosion-resistant material cannot necessarily cover the entire surface of the member, corrosion sometimes proceeds from the gap portion. In addition, since the sealing with the corrosion resistant material is performed by a protective film made of resin, there is a possibility that the joint portion is exposed due to deterioration due to aging and use environment, damage due to mechanical contact, and the like.
特許文献２では、電池セルの製造後、電極リード部材に異種金属を接合、樹脂被覆する場合には接続終了後の組電池形態での樹脂被覆作業性が悪く、不良品となった場合の損失も大きく、リード部材だけでなく電池セル或いはそれ以上に影響を及ぼしてしまう。 In patent document 2, after manufacturing a battery cell, when dissimilar metals are joined to the electrode lead member and resin-coated, the resin-coating workability in the assembled battery form after connection is poor and the loss when it becomes a defective product In other words, it affects not only the lead member but also the battery cell or more.
そこで、本発明の目的は、接合部分の腐食を抑制でき、電池モジュール製造作業を簡便にすることができる電極リード接続体及び電極リード接続アセンブリを提供することにある。 SUMMARY OF THE INVENTION An object of the present invention is to provide an electrode lead connection body and an electrode lead connection assembly that can suppress corrosion at the joint and simplify battery module manufacturing work.
この目的を達成するために創案された本発明は、一方の電池セルに設けられた正極リードと、前記一方の電池セルに隣接する他方の電池セルに設けられ、前記正極リードとは異なる金属からなる負極リードと、を接続する電極リード接続体において、前記正極リードと同じ金属からなり、前記正極リードに接続される正極接続部材と、前記負極リードと同じ金属からなり、前記負極リードに接続される負極接続部材と、を備え、前記正極接続部材は、前記正極リードとの接続部分以外の部分で前記負極接続部材と接合されており、前記正極接続部材の前記負極接続部材との接合部分以外の部分の表面積が前記負極接続部材の前記正極接続部材との接合部分以外の部分の表面積の２倍以上である電極リード接続体である。 The present invention devised to achieve this object includes a positive electrode lead provided in one battery cell and a metal electrode different from the positive electrode lead provided in the other battery cell adjacent to the one battery cell. An electrode lead connecting body for connecting the negative electrode lead, made of the same metal as the positive electrode lead, a positive electrode connecting member connected to the positive electrode lead, and made of the same metal as the negative electrode lead, and connected to the negative electrode lead The positive electrode connecting member is bonded to the negative electrode connecting member at a portion other than a portion connected to the positive electrode lead, and other than a portion connected to the negative electrode connecting member of the positive electrode connecting member. The electrode lead connector has a surface area of at least twice the surface area of the negative electrode connecting member other than the junction with the positive electrode connecting member.
前記接合部分は、前記正極接続部材の端面と前記負極接続部材の端面とが突き合わされて接合されていても良い。 The joining portion may be joined by abutting the end face of the positive electrode connecting member and the end face of the negative electrode connecting member.
前記接合部分は、前記正極接続部材の一部と前記負極接続部材の一部とが重ね合わされて接合されていても良い。 The joining portion may be joined by overlapping a part of the positive electrode connecting member and a part of the negative electrode connecting member.
前記接合部分は、前記正極接続部材の一部と前記負極接続部材の一部とが重ね合わされ、前記正極接続部材の端面と前記負極接続部材の前記正極接続部材が重ね合わされた面、及び前記負極接続部材の端面と前記正極接続部材の前記負極接続部材が重ね合わされた面が各々接合されていても良い。 The joining portion includes a part of the positive electrode connecting member and a part of the negative electrode connecting member overlapped, a surface of the positive electrode connecting member and a surface of the negative electrode connecting member superimposed of the positive electrode connecting member, and the negative electrode The end surface of the connection member and the surface where the negative electrode connection member of the positive electrode connection member is overlapped may be joined.
前記接合部分は、前記正極接続部材及び前記負極接続部材の各端部が折り曲げられた折り曲げ部を有し、前記折り曲げ部同士を互いに咬み合わせるように前記正極接続部材と前記負極接続部材とが接合されていても良い。 The joint portion has a bent portion where each end of the positive electrode connecting member and the negative electrode connecting member is bent, and the positive electrode connecting member and the negative electrode connecting member are bonded so that the bent portions are engaged with each other. May be.
前記接合部分は、前記折り曲げ部が押圧されて接合されていても良い。 The joint portion may be joined by pressing the bent portion.
前記正極接続部材はアルミニウムで構成され、前記負極接続部材は銅、銅合金、ニッケル、ニッケルめっきが施された銅のいずれか一種から選択された金属で構成されても良い。 The positive electrode connecting member may be made of aluminum, and the negative electrode connecting member may be made of a metal selected from any one of copper, copper alloy, nickel, and copper plated with nickel.
前記正極接続部材の表面にＺｎＯからなる酸化膜が形成されても良い。 An oxide film made of ZnO may be formed on the surface of the positive electrode connection member.
前記負極接続部材に電圧監視用ケーブルが接続されても良い。 A voltage monitoring cable may be connected to the negative electrode connecting member.
また本発明は、前記電極リード接続体を複数備え、これら電極リード接続体の各々に電圧監視用ケーブルが接続されており、前記電圧監視用ケーブルが集合されてハーネスが形成された電極リード接続アセンブリである。 The present invention also includes an electrode lead connection assembly including a plurality of the electrode lead connection bodies, a voltage monitoring cable connected to each of the electrode lead connection bodies, and a harness formed by assembling the voltage monitoring cables. It is.
本発明によれば、接合部分の腐食を抑制でき、電池モジュール製造作業を簡便にすることができる電極リード接続体及び電極リード接続アセンブリを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the corrosion of a junction part can be suppressed and the electrode lead connection body and electrode lead connection assembly which can simplify a battery module manufacturing operation can be provided.
以下、本発明の好適な実施の形態を添付図面にしたがって説明する。 Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
図１〜３に示すように、本実施の形態に係る電極リード接続体１０は、一方の電池セル１１に設けられた正極リード１２と、一方の電池セル１１に隣接する他方の電池セル１１に設けられ、正極リード１２とは異なる金属からなる負極リード１３と、を接続するものであり、正極リード１２と同じ金属からなり、正極リード１２に接続される正極接続部材１４と、負極リード１３と同じ金属からなり、負極リード１３に接続される負極接続部材１５と、を備える。 As shown in FIGS. 1 to 3, the electrode lead connector 10 according to the present exemplary embodiment includes a positive electrode lead 12 provided in one battery cell 11 and the other battery cell 11 adjacent to the one battery cell 11. A negative electrode lead 13 made of a metal different from the positive electrode lead 12, a positive electrode connecting member 14 made of the same metal as the positive electrode lead 12 and connected to the positive electrode lead 12, And a negative electrode connection member 15 made of the same metal and connected to the negative electrode lead 13.
この電極リード接続体１０は、複数の電池セル１１間に配置してこれらを接続することで電池モジュール３０を作製するためのものである。 This electrode lead connection body 10 is for producing the battery module 30 by arranging between the battery cells 11 and connecting them.
電池セル１１の正極はアルミニウム（Ａｌ）からなり、負極は銅（Ｃｕ）からなる。また、正極リード１２はＡｌ又はその合金からなり、負極リード１３はＣｕ、ニッケル（Ｎｉ）又はＮｉめっきが施されたＣｕからなる。 The positive electrode of the battery cell 11 is made of aluminum (Al), and the negative electrode is made of copper (Cu). The positive electrode lead 12 is made of Al or an alloy thereof, and the negative electrode lead 13 is made of Cu, nickel (Ni), or Cu plated with Ni.
正極接続部材１４と負極接続部材１５は互いに金属が異なり、正極接続部材１４は正極リード１２と同種金属からなり、負極接続部材１５は負極リード１３と同種金属からなる。即ち、正極接続部材１４はＡｌで構成され、負極接続部材１５はＣｕ、Ｃｕ合金、Ｎｉ、Ｎｉめっきが施されたＣｕのいずれか一種から選択された金属で構成される。負極接続部材１５をＣｕ合金、Ｎｉ、Ｎｉめっきが施されたＣｕで構成することができるのは、これら金属がＣｕ（純Ｃｕ）と同等の腐食電位にあるためである。 The positive electrode connecting member 14 and the negative electrode connecting member 15 are made of different metals, the positive electrode connecting member 14 is made of the same kind of metal as the positive electrode lead 12, and the negative electrode connecting member 15 is made of the same kind of metal as the negative electrode lead 13. That is, the positive electrode connection member 14 is made of Al, and the negative electrode connection member 15 is made of a metal selected from any one of Cu, Cu alloy, Ni, and Cu plated with Ni. The reason why the negative electrode connection member 15 can be made of Cu alloy, Ni, or Cu plated with Ni is because these metals have a corrosion potential equivalent to that of Cu (pure Cu).
また、正極接続部材１４の表面にＺｎＯからなる酸化膜が形成されても良い。これにより、正極接続部材１４の腐食の進展を抑止する効果を得られる。なお、正極接続部材１４の表面に酸化膜を形成するためには、めっきや溶射などの工法を用いれば良い。 An oxide film made of ZnO may be formed on the surface of the positive electrode connection member 14. Thereby, the effect of suppressing the progress of corrosion of the positive electrode connection member 14 can be obtained. In order to form an oxide film on the surface of the positive electrode connection member 14, a method such as plating or thermal spraying may be used.
正極接続部材１４と負極接続部材１５は、例えばはんだ接続、超音波溶接、又はレーザ溶接によって接合されて接合部分１６が形成される。正極接続部材１４と負極接続部材１５とを接合する際にレーザ溶接を用いる場合は、融点の低い金属側（即ち、Ａｌからなる正極接続部材１４側）からレーザ光線を当てるようにすると良い。このような工法を採ることにより、例えば抵抗溶接などでは困難とされる異種金属の接合が高い接合強度で達成できる。 The positive electrode connection member 14 and the negative electrode connection member 15 are bonded by, for example, solder connection, ultrasonic welding, or laser welding to form the bonded portion 16. When laser welding is used when the positive electrode connection member 14 and the negative electrode connection member 15 are joined, the laser beam may be applied from the metal side having a low melting point (that is, the positive electrode connection member 14 side made of Al). By adopting such a construction method, for example, joining of dissimilar metals, which is difficult by resistance welding or the like, can be achieved with high joint strength.
なお、正極接続部材１４と負極接続部材１５との重ね代は製造する電池モジュールの大きさにより適宜変更することができる。また、レーザ光線の１点当たりの照射範囲は狭いので接合部分１６のサイズによらず、所望の接合強度確保のために打点数を増やすことが可能である。 In addition, the overlap allowance of the positive electrode connection member 14 and the negative electrode connection member 15 can be suitably changed with the magnitude | size of the battery module to manufacture. Further, since the irradiation range per one point of the laser beam is narrow, it is possible to increase the number of hit points in order to ensure a desired bonding strength regardless of the size of the bonding portion 16.
更に、図２に示すように、負極接続部材１５にその金属と同種の金属からなる導体を有する電圧監視用ケーブル１７を接続しても良い。電極リード接続体１０と電圧監視用ケーブル１７を同種の金属で接続することで、より一般的で生産性が高い、例えば抵抗溶接を採用することができると同時に、局部電池効果による接続部の腐食現象の発生を抑制することができる。 Furthermore, as shown in FIG. 2, a voltage monitoring cable 17 having a conductor made of the same metal as the metal may be connected to the negative electrode connection member 15. By connecting the electrode lead connector 10 and the voltage monitoring cable 17 with the same type of metal, it is possible to employ, for example, resistance welding, which is more general and highly productive, and at the same time, corrosion of the connection due to the local battery effect Occurrence of the phenomenon can be suppressed.
さて、本実施の形態に係る電極リード接続体１０において、正極接続部材１４は、正極リード１２との接続部分以外の部分で負極接続部材１５と接合されており、正極接続部材１４の負極接続部材１５との接合部分１６以外の部分の表面積が負極接続部材１５の正極接続部材１４との接合部分１６以外の部分の表面積の２倍以上である。即ち、負極接続部材１５の正極接続部材１４との接合部分１６以外の部分の表面積に比べて、腐食電位がより低い金属からなる正極接続部材１４の負極接続部材１５との接合部分１６以外の部分の表面積を大きくすることで腐食を抑制することができる電極リード接続体１０を実現している。以下にそのメカニズムを述べる。 In the electrode lead connector 10 according to the present embodiment, the positive electrode connection member 14 is joined to the negative electrode connection member 15 at a portion other than the connection portion with the positive electrode lead 12, and the negative electrode connection member of the positive electrode connection member 14. The surface area of the part other than the joint part 16 with the surface area 15 is twice or more the surface area of the part other than the joint part 16 with the positive electrode connection member 14 of the negative electrode connection member 15. That is, the portion of the negative electrode connection member 15 other than the joint portion 16 with the negative electrode connection member 15 of the positive electrode connection member 14 made of a metal having a lower corrosion potential than the surface area of the portion other than the joint portion 16 with the positive electrode connection member 14 of the negative electrode connection member 15. The electrode lead connector 10 capable of suppressing corrosion by increasing the surface area is realized. The mechanism is described below.
異種金属が接触した状態での腐食量は、各金属が単独で存在するよりも多くなる。これは、金属が単独の状態で存在する場合には、大気又は水中の酸素量によって形成される酸化物の量が決定されるが、異種金属同士が接触すると局部電池効果によって腐食が促進されてしまうからである。 The amount of corrosion in a state where different metals are in contact with each other is larger than that in which each metal exists alone. This is because when the metal exists in a single state, the amount of oxide formed is determined by the amount of oxygen in the atmosphere or water, but when dissimilar metals come into contact with each other, corrosion is promoted by the local cell effect. Because it ends up.
局部電池効果の起電力は、接触している金属の接合部分１６以外の部分の表面積で決まるものであるので、これら金属の体積を変えることで両者の電位を制御でき、それによって腐食量もコントロールすることが可能になる。 Since the electromotive force of the local battery effect is determined by the surface area of the portion other than the contact portion 16 of the metal that is in contact, the potential of both can be controlled by changing the volume of these metals, thereby controlling the amount of corrosion. It becomes possible to do.
海水がかかるような過酷な環境において、接続したＣｕ（負極接続部材１５）とＡｌ（正極接続部材１４）の接合部分１６以外の部分の表面積の比が１：１の場合には、Ａｌの腐食量はＡｌが単独で存在する場合に比べて２０倍も多くなるが、これを１：５とすることで２倍程度にまで低減することができる。更に、１：２０とすることで１．５倍程度にまで腐食量を低減することができるが、両部材の寸法が大幅に異なることになるため、接合などの作業性が低下する。逆に、１：０．１とＡｌのＣｕとの接合部分１６以外の部分の表面積を低減すると腐食量は大幅に増加し、Ａｌ単独の場合の１００倍にも達する。 In a harsh environment where seawater is applied, if the surface area ratio of the portion other than the joined portion 16 of the connected Cu (negative electrode connecting member 15) and Al (positive electrode connecting member 14) is 1: 1, the corrosion of Al The amount is 20 times greater than when Al is present alone, but it can be reduced to about 2 times by setting this to 1: 5. Furthermore, although the amount of corrosion can be reduced to about 1.5 times by setting it to 1:20, since the dimension of both members will differ greatly, workability | operativity, such as joining, will fall. Conversely, if the surface area of the portion other than the joint portion 16 of 1: 0.1 and Al Cu is reduced, the amount of corrosion increases significantly, reaching 100 times that of Al alone.
このような理由から、本実施の形態では、正極接続部材１４の負極接続部材１５との接合部分１６以外の部分の表面積が負極接続部材１５の正極接続部材１４との接合部分１６以外の部分の表面積の２倍以上であることとしている。なお、前述したように、あまりにも両者の大きさが異なるような比率にするのは作業性の観点から好ましくない。 For this reason, in the present embodiment, the surface area of the portion other than the joint portion 16 of the positive electrode connection member 14 with the negative electrode connection member 15 is the portion other than the joint portion 16 of the negative electrode connection member 15 with the positive electrode connection member 14. The surface area is at least twice the surface area. In addition, as mentioned above, it is not preferable from the viewpoint of workability to set the ratio so that the sizes of the two are too different.
正極接続部材１４と負極接続部材１５の接合部分１６以外の部分の表面積の比率を変更するためには、両者の長さをＬ１：Ｌ２にして異ならせたり（図４参照）、両者の厚さをｔ１：ｔ２にして異ならせたり（図５参照）、両者の幅をＷ１：Ｗ２にして異ならせたり（図６参照）すれば良い。これらは配線部の制約により適宜選定することが可能である。 In order to change the ratio of the surface areas of the positive electrode connecting member 14 and the negative electrode connecting member 15 other than the joint portion 16, the lengths of the two can be changed to L1: L2 (see FIG. 4), or the thicknesses of the two can be changed. May be set different from t1: t2 (see FIG. 5), or the widths of both may be changed to W1: W2 (see FIG. 6). These can be appropriately selected depending on the restrictions of the wiring portion.
この正極接続部材１４と負極接続部材１５との接合方法には様々な方法を採用することができる。 Various methods can be adopted as a method of joining the positive electrode connecting member 14 and the negative electrode connecting member 15.
例えば図７に示すように、接合部分１６は、長さをＬ１：Ｌ２にして異ならせた正極接続部材１４の端面と負極接続部材１５の端面とが突き合わされて接合されていても良い。これはレーザ溶接、スポット抵抗溶接により接合したものであり、各種接合を行うことによって形成される溶接痕１８，１８に挟まれて正極接続部材１４と負極接続部材１５が接触している部分が接合部分１６となる。この構造は、両者間に段差が生じないため、全体を小型化することが可能になる。 For example, as shown in FIG. 7, the joining portion 16 may be joined with the end face of the positive electrode connecting member 14 and the end face of the negative electrode connecting member 15 having different lengths of L1: L2. This is joined by laser welding or spot resistance welding, and the portion where the positive electrode connection member 14 and the negative electrode connection member 15 are in contact with each other between the welding marks 18 and 18 formed by performing various types of bonding is bonded. It becomes part 16. Since this structure does not cause a step between the two, the entire structure can be reduced in size.
また図８に示すように、接合部分１６は、長さをＬ１：Ｌ２にして異ならせた正極接続部材１４の一部と負極接続部材１５の一部とが重ね合わされて接合されていても良い。これはレーザ溶接、スポット抵抗溶接、又は超音波溶接により接合したものであり、各種接合を行うことによって形成される溶接痕１８，１８に挟まれて正極接続部材１４と負極接続部材１５が接触している部分が接合部分１６となる。この構造は、加工の自由度が高く、低コスト化に向いている。 Further, as shown in FIG. 8, the joining portion 16 may be joined by overlapping a part of the positive electrode connecting member 14 and a part of the negative electrode connecting member 15 which have different lengths of L1: L2. . This is joined by laser welding, spot resistance welding, or ultrasonic welding, and the positive electrode connecting member 14 and the negative electrode connecting member 15 are in contact with each other by being sandwiched between welding marks 18 formed by performing various types of bonding. The part which becomes is the joint part 16. This structure has a high degree of freedom in processing and is suitable for cost reduction.
図９は図８の変形例であり、接合部分１６は、長さをＬ１：Ｌ２にして異ならせた正極接続部材１４の一部と負極接続部材１５の一部とが重ね合わされ、正極接続部材１４の端面と負極接続部材１５の正極接続部材１４が重ね合わされた面、及び負極接続部材１５の端面と正極接続部材１４の負極接続部材１５が重ね合わされた面が各々接合されている。この場合には、前述した種々の溶接工法に加えてはんだ１８’，１８’を用いたはんだ接続を適用することが可能となる。このような各種接合を行うことによって形成される溶接痕１８，１８、又ははんだ１８’、１８’に挟まれて正極接続部材１４と負極接続部材１５が接触している部分が接合部分１６となる。 FIG. 9 is a modified example of FIG. 8, and the joining portion 16 has a part of the positive electrode connecting member 14 and a part of the negative electrode connecting member 15 which are made different in length L1: L2, and is overlapped. The end surface of 14 and the surface where the positive electrode connection member 14 of the negative electrode connection member 15 are overlapped, and the end surface of the negative electrode connection member 15 and the surface where the negative electrode connection member 15 of the positive electrode connection member 14 are overlapped are joined. In this case, it is possible to apply solder connection using the solders 18 'and 18' in addition to the various welding methods described above. A portion where the positive electrode connecting member 14 and the negative electrode connecting member 15 are in contact with each other between the welding marks 18 and 18 or the solders 18 ′ and 18 ′ formed by performing such various bondings becomes the bonding portion 16. .
また図１０に示すように、接合部分１６は、長さをＬ１：Ｌ２にして異ならせた正極接続部材１４及び負極接続部材１５の各端部が折り曲げられた折り曲げ部１９を有し、折り曲げ部１９同士を互いに咬み合わせるように正極接続部材１４と負極接続部材１５とが接合されていても良い。これは、レーザ溶接、スポット抵抗溶接、又は超音波溶接により接合したものであり、各種接合を行うことによって形成される溶接痕１８，１８に挟まれて正極接続部材１４と負極接続部材１５が接触している部分が接合部分１６となる。この構造は、厚みは増加するものの両者が多層となるため強度が向上する。 As shown in FIG. 10, the joining portion 16 has a bent portion 19 in which the end portions of the positive electrode connecting member 14 and the negative electrode connecting member 15 having different lengths of L1: L2 are bent. The positive electrode connecting member 14 and the negative electrode connecting member 15 may be joined so as to bite each other. This is joined by laser welding, spot resistance welding, or ultrasonic welding, and the positive electrode connection member 14 and the negative electrode connection member 15 are in contact with each other by being sandwiched between welding marks 18 and 18 formed by performing various types of bonding. The part which has become the joining part 16. Although this structure increases in thickness, both layers are multi-layered, so the strength is improved.
図１１は図１０の変形例であり、接合部分１６は、折り曲げ部１９が押圧されて接合された後、その押圧成形部を溶接したものであり、更に強度を向上させることができる。なお、強度は低下するが、溶接をせずに押圧のみで接合しても良い。この構造では、押圧成形部において正極接続部材１４と負極接続部材１５が接触している部分が接合部分１６となる。 FIG. 11 is a modification of FIG. 10, and the joining portion 16 is obtained by welding the press-molded portion after the bent portion 19 is pressed and joined, and the strength can be further improved. In addition, although intensity | strength falls, you may join only by pressing, without welding. In this structure, a portion where the positive electrode connection member 14 and the negative electrode connection member 15 are in contact with each other in the press-molding portion becomes the bonding portion 16.
図１０，１１に示したように、機械的な工法を併用することで更に接合を強固にし、腐食の抑制効果を高めることができる。 As shown in FIGS. 10 and 11, the joint can be further strengthened by using a mechanical method together, and the effect of suppressing corrosion can be enhanced.
これまで説明した電極リード接続体１０を電池セル１１間の配線として用い、複数の電池セル１１を接続することで図３に示した電池モジュール３０を作製することができる。このとき、電極リード接続体１０の正極接続部材１４と電池セル１１の正極リード１２、及び電極リード接続体１０の負極接続部材１５と電池セル１１の負極リード１３を接合することで同種金属同士の接合とすることができる。 The battery module 30 shown in FIG. 3 can be manufactured by connecting the plurality of battery cells 11 using the electrode lead connector 10 described so far as the wiring between the battery cells 11. At this time, by joining the positive electrode connecting member 14 of the electrode lead connector 10 and the positive electrode lead 12 of the battery cell 11, and the negative electrode connecting member 15 of the electrode lead connector 10 and the negative electrode lead 13 of the battery cell 11, Can be joined.
異種金属同士の溶接では、融点が異なるために低融点金属が先に溶けて、高融点金属が未溶融状態となる。そのため、加工条件の選定が非常に難しくなり、電池セル１１間の配線の際に異種金属同士の接合を実施するのが難しいことになる。それに対して本実施の形態によれば、予め電極リード接続体１０を準備しておけば、現場でのその後の溶接が同種金属同士となるので、電池セル１１間の配線加工においても作業効率が向上するメリットがある。 In the welding of different metals, since the melting points are different, the low melting point metal is melted first, and the high melting point metal is in an unmelted state. Therefore, it becomes very difficult to select processing conditions, and it is difficult to perform bonding between different metals when wiring between the battery cells 11. On the other hand, according to the present embodiment, if the electrode lead connecting body 10 is prepared in advance, the subsequent welding at the site becomes the same kind of metal, so that the work efficiency is also achieved in the wiring processing between the battery cells 11. There is a merit to improve.
更に、図２に示したように、特にリチウムイオン二次電池などで必要とされる電圧などを監視する機能を付与するための電圧監視用ケーブル１７を予め接続しておくことで、電池セル１１間の接続加工における作業が容易となる。 Further, as shown in FIG. 2, by connecting in advance a voltage monitoring cable 17 for providing a function for monitoring a voltage required particularly for a lithium ion secondary battery or the like, the battery cell 11 Work in the connecting process between them becomes easy.
一般に非水電解質二次電池の電池セル１１は複数あるため、複数の電極リード接続体１０を使用することになり、電極リード接続体１０に接続される電圧監視用ケーブル１７が煩雑になることが予想される。そのため、図１２に示すように、電極リード接続体１０を複数備え、これら電極リード接続体１０の各々に電圧監視用ケーブル１７が接続されており、電圧監視用ケーブル１７が集合されてハーネス２０が形成された電極リード接続アセンブリ１２０とすることで、作業の煩雑さを抑止する効果がある。 In general, since there are a plurality of battery cells 11 of the nonaqueous electrolyte secondary battery, a plurality of electrode lead connecting bodies 10 are used, and the voltage monitoring cable 17 connected to the electrode lead connecting body 10 becomes complicated. is expected. Therefore, as shown in FIG. 12, a plurality of electrode lead connecting bodies 10 are provided, and a voltage monitoring cable 17 is connected to each of these electrode lead connecting bodies 10, and the voltage monitoring cables 17 are assembled to form a harness 20. By using the formed electrode lead connection assembly 120, there is an effect of suppressing the complexity of work.
これらは単独で実施することも可能であるが、相互に組み合わせることで各々の効果を発現することができる。 These can be carried out alone, but each effect can be expressed by combining them.
以上要するに、本発明によれば、接合部分の腐食を抑制でき、電池モジュール製造作業を簡便にすることができる電極リード接続体及び電極リード接続アセンブリを提供することができる。 In short, according to the present invention, it is possible to provide an electrode lead connection body and an electrode lead connection assembly that can suppress the corrosion of the joint portion and simplify the battery module manufacturing work.
更に、接合自体が困難な異種金属同士の接合を別工程とすることで、電池セルの電極間の接続が容易になる。また、電極リード接続体に予め電圧監視用ケーブルを接続したものとすることで、電極間接続後の狭い作業空間で接続を行うより接続加工の自由度を高めることができ、更に多くの配線を束ねた構造を採用することで加工の煩雑さを回避することが可能となる。 Furthermore, the connection between the electrodes of a battery cell becomes easy by making joining of the dissimilar metals difficult to join itself into another process. In addition, by connecting the voltage monitoring cable to the electrode lead connection body in advance, the degree of freedom of connection processing can be increased compared to connecting in a narrow work space after interelectrode connection, and more wires can be connected. By adopting a bundled structure, it is possible to avoid complicated processing.
以下、従来例、実施例、及び比較例について説明する。 Hereinafter, conventional examples, examples, and comparative examples will be described.
Ｃｕからなる負極接続部材の正極接続部材との接合部分以外の部分の表面積とＡｌからなる正極接続部材の負極接続部材との接合部分以外の部分の表面積の比率と、Ａｌの腐食量との関係について調査した。腐食環境は、海水に浸される過酷な状態を想定し、３％ＮａＣｌ水溶液を用いた。両部材の寸法は、幅１０ｍｍ、厚さ１ｍｍとし、長さを変えたＣｕとＡｌの接続部材を数種類用意した。正極接続部材と負極接続部材は、正極接続部材の端面と負極接続部材の端面とを突き合わせて接合した。１０００ｍｌの３％ＮａＣｌ水溶液の中に両部材を接合した電極リード接続体を浸漬して１週間放置した後に、Ａｌの腐食量を測定した。腐食生成物としてＡｌの酸化物、塩化物があり、これらの重量増加分を測定して腐食量とした。腐食量の結果から、電極リード接続体として合格するものを○、特に優秀なものを◎とし、不合格を×とした。 Relationship between the surface area ratio of the portion other than the joint portion of the negative electrode connection member made of Cu with the positive electrode connection member and the surface area of the portion other than the joint portion of the positive electrode connection member made of Al with the negative electrode connection member, and the corrosion amount of Al Was investigated. The corrosive environment was assumed to be a harsh state immersed in seawater, and 3% NaCl aqueous solution was used. The dimensions of both members were 10 mm in width and 1 mm in thickness, and several types of Cu and Al connecting members having different lengths were prepared. The positive electrode connecting member and the negative electrode connecting member were joined by abutting the end face of the positive electrode connecting member and the end face of the negative electrode connecting member. After immersing the electrode lead connection body in which both members were joined in 1000 ml of 3% NaCl aqueous solution and leaving it to stand for 1 week, the corrosion amount of Al was measured. Corrosion products include Al oxides and chlorides, and these weight increases were measured as corrosion amounts. From the results of the amount of corrosion, those that passed as electrode lead assemblies were marked with ◯, especially those that were excellent, and NG.
表１に示すように、Ａｌ単体の腐食量を１としたとき、従来例１のようにＣｕのＡｌとの接合部分以外の部分の表面積と、ＡｌのＣｕとの接合部分以外の部分の表面積とが同じ１：１の場合には腐食量が２０倍となった。それに対して１：２の実施例１は１０倍、１：５の実施例２は２倍、１：２０の実施例３は１．５倍、１：４０の実施例４は１．３倍程度にまで低減した。 As shown in Table 1, when the corrosion amount of Al alone is 1, the surface area of the portion other than the bonded portion of Cu with Al and the surface area of the portion other than the bonded portion of Al with Cu as in Conventional Example 1 In the case of the same 1: 1, the amount of corrosion was 20 times. In contrast, 1: 2 Example 1 is 10 times, 1: 5 Example 2 is 2 times, 1:20 Example 3 is 1.5 times, and 1:40 Example 4 is 1.3 times. Reduced to a degree.
比較例１としてＡｌのＣｕとの接合部分以外の部分の表面積がＣｕのＡｌとの接合部分以外の部分の表面積に比べて１：０．１と少ない場合を検討したが、Ａｌ単体の腐食量に対して、Ｃｕを接合した際の腐食量が１００倍と非常に大きくなった。 As Comparative Example 1, the case where the surface area of the portion other than the joint portion of Al with Cu was less than 1: 0.1 compared with the surface area of the portion other than the joint portion of Cu with Al was investigated. On the other hand, the amount of corrosion when bonding Cu was as large as 100 times.
更に、ＣｕのＡｌとの接合部分以外の部分の表面積に対するＡｌのＣｕとの接合部分以外の部分の表面積を１：４０より大きくした場合を検討したが、ＡｌのＣｕとの接合部分以外の部分の表面積を大きくすることで腐食量は低減したものの接合加工が困難になるなどデメリットが大きくなるため、Ｃｕ：Ａｌの接合部分以外の部分の表面積の比率は１：４０程度までが好ましい。 Furthermore, the case where the surface area of the part other than the bonded part of Al with respect to the surface area of the part other than the bonded part of Cu with Al was examined to be larger than 1:40, but the part other than the bonded part of Al with Cu was examined. The surface area ratio of the portion other than the Cu: Al joining portion is preferably up to about 1:40, because the disadvantage is increased by increasing the surface area of the alloy, but the amount of corrosion is reduced but the joining process becomes difficult.
接合部分以外の部分の表面積の比率の変更は、図４〜６に示したようにして行ったが、いずれの方法でも実施例１〜４で示したものと同じ効果が得られた。 The change in the ratio of the surface area of the portion other than the joined portion was performed as shown in FIGS. 4 to 6, but the same effects as those shown in Examples 1 to 4 were obtained by any method.
このように本発明による電極リード接続体は、機械的に十分な接合強度を有すると同時に異種金属同士の接合による局部電池効果に起因する接合部分における腐食を効果的に抑制することができる。また、接続作業を簡便にすることが可能で、配線後の電圧監視用ケーブルの整列も容易に行える。 As described above, the electrode lead connector according to the present invention has mechanically sufficient bonding strength and can effectively suppress corrosion at the bonded portion due to the local battery effect due to bonding of different metals. Further, the connection work can be simplified, and the voltage monitoring cables can be easily aligned after wiring.
１０ 電極リード接続体
１１ 電池セル
１２ 正極リード
１３ 負極リード
１４ 正極接続部材
１５ 負極接続部材
１６ 接合部分
１７ 電圧監視用ケーブル
１８ 溶接痕
１８’ はんだ
１９ 折り曲げ部
２０ ハーネス
３０ 電池モジュール
１２０ 電極リード接続アセンブリ
DESCRIPTION OF SYMBOLS 10 Electrode lead connection body 11 Battery cell 12 Positive electrode lead 13 Negative electrode lead 14 Positive electrode connection member 15 Negative electrode connection member 16 Joining part 17 Voltage monitoring cable 18 Welding mark 18 'Solder 19 Bending part 20 Harness 30 Battery module 120 Electrode lead connection assembly
Claims (10)
前記正極リードと同じ金属からなり、前記正極リードに接続される正極接続部材と、
前記負極リードと同じ金属からなり、前記負極リードに接続される負極接続部材と、
を備え、
前記正極接続部材は、前記正極リードとの接続部分以外の部分で前記負極接続部材と接合されており、
前記正極接続部材の前記負極接続部材との接合部分以外の部分の表面積が前記負極接続部材の前記正極接続部材との接合部分以外の部分の表面積の２倍以上であることを特徴とする電極リード接続体。 In the electrode lead connector for connecting the positive electrode lead provided in one battery cell and the negative electrode lead provided in the other battery cell adjacent to the one battery cell and made of a metal different from the positive electrode lead,
A positive electrode connecting member made of the same metal as the positive electrode lead and connected to the positive electrode lead;
A negative electrode connecting member made of the same metal as the negative electrode lead and connected to the negative electrode lead;
With
The positive electrode connection member is joined to the negative electrode connection member at a portion other than a connection portion with the positive electrode lead,
The electrode lead characterized in that the surface area of the positive electrode connecting member other than the bonded portion with the negative electrode connecting member is at least twice the surface area of the negative electrode connecting member other than the bonded portion with the positive electrode connecting member. Connected body.
前記負極接続部材は銅、銅合金、ニッケル、ニッケルめっきが施された銅のいずれか一種から選択された金属で構成されたことを特徴とする請求項１〜６のいずれかに記載の電極リード接続体。 The positive electrode connecting member is made of aluminum,
The electrode lead according to claim 1, wherein the negative electrode connection member is made of a metal selected from any one of copper, copper alloy, nickel, and nickel-plated copper. Connected body.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011237690A JP2013097923A (en) | 2011-10-28 | 2011-10-28 | Electrode lead connection body and electrode lead connection assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011237690A JP2013097923A (en) | 2011-10-28 | 2011-10-28 | Electrode lead connection body and electrode lead connection assembly |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113437446A (en) * | 2021-05-18 | 2021-09-24 | 湖北亿纬动力有限公司 | Integrated auxiliary soldering lug, lithium battery cell and assembling method thereof |
| JP2021150247A (en) * | 2020-03-23 | 2021-09-27 | 愛三工業株式会社 | Welding method and battery module manufacturing method |
-
2011
- 2011-10-28 JP JP2011237690A patent/JP2013097923A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021150247A (en) * | 2020-03-23 | 2021-09-27 | 愛三工業株式会社 | Welding method and battery module manufacturing method |
| JP7348119B2 (en) | 2020-03-23 | 2023-09-20 | 愛三工業株式会社 | Welding method and battery module manufacturing method |
| CN113437446A (en) * | 2021-05-18 | 2021-09-24 | 湖北亿纬动力有限公司 | Integrated auxiliary soldering lug, lithium battery cell and assembling method thereof |
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