JP2014191888A - Electrode terminal connection body and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrode terminal connection body and a manufacturing method therefor capable of suppressing corrosion and heightening in resistance at a joining part of the electrode terminal connection body.SOLUTION: Provided is an electrode terminal connection body 10 for electrically connecting a positive electrode terminal 11 and a negative electrode terminal 12 formed with mutually different kinds of metal, wherein the electrode terminal connection body 10 is provided with a positive electrode terminal connection part 13 formed with the same kind of metal as the positive electrode terminal 11 and a negative electrode terminal connection part 14 formed with the same kind of metal as the negative electrode terminal 12, and the positive electrode terminal connection part 13 and the negative electrode terminal connection part 14 are joined together via an interposition part 15 formed with a metal having an ionization tendency between a metal forming the positive electrode terminal 11 and a metal forming the negative electrode terminal 12.

Description

  The present invention relates to an electrode terminal connector for electrically connecting a positive electrode terminal and a negative electrode terminal which are formed of different metals, and a method for manufacturing the electrode terminal connector.

  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 a higher energy output per unit volume (or unit mass) than other batteries such as lead-acid batteries, so mobile communication devices, laptop computers, electric vehicles, and hybrid vehicles Furthermore, application to electric power storage systems using renewable energy such as solar cells is expected.

  Such a nonaqueous electrolyte secondary battery includes an electrode group having a laminated structure in which a separator is disposed between a positive electrode and a negative electrode, an exterior body for housing the electrode group, and an electrolyte solution enclosed in the exterior body And.

  Aluminum is used as the base material for the positive electrode, and copper is used as the base material for the negative electrode. A positive electrode terminal made of aluminum or an aluminum alloy is electrically connected to the positive electrode, and a negative electrode terminal made of copper or a copper alloy is electrically connected to the negative electrode.

  This non-aqueous electrolyte secondary battery is used as a single unit in small devices with small output, but it is naturally not enough for large devices that require large output, so multiple non-aqueous electrolyte secondary batteries are connected in series and parallel. Thus, a desired output is obtained.

  In this case, it is necessary to electrically connect the positive electrode terminal and the negative electrode terminal. However, as described above, since the positive electrode terminal and the negative electrode terminal are formed of different metals, it is necessary to join different metals. Don't be. In the joining of dissimilar metals, there is a concern about the problem of corrosion and high resistance of the joint due to the local battery effect due to the difference in metal ionization tendency.

  Further, as for 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 general resistance welding as a technique for joining metals. If stable bonding strength cannot be obtained, it cannot be said that it is preferable from the viewpoint of vibration resistance.

  For example, Patent Document 1 includes a positive electrode connection portion that can be connected to the positive electrode terminal and a negative electrode connection portion that can be connected to the negative electrode terminal, and the negative electrode connection portion surrounds the positive electrode connection portion, or An electrode terminal connection body is disclosed in which a positive electrode connection portion is disposed so as to surround the negative electrode connection portion, and the positive electrode connection portion and the negative electrode connection portion are integrally bonded by metal bonding.

  Patent Document 2 discloses an electrode portion that is connected to one electrode terminal and formed of the same metal as the electrode terminal, and a bus bar portion that is connected to the electrode portion and formed of the same metal as the other electrode terminal. , And an electrode terminal connector in which an electrode part and a bus bar part are integrated by diffusion bonding is disclosed.

  According to these electrode terminal connecting bodies, since the joining of the electrode terminal connecting body and the electrode terminals can be made of the same kind of metals, it is possible to prevent the occurrence of corrosion and high resistance due to the local battery effect in principle. In addition, a simple method such as resistance welding can be adopted as a method for joining the metals.

JP 2011-210482A JP 2012-89254 A

  However, the electrode terminal connector described in Patent Document 1 or 2 is originally a combination of dissimilar metals, and there is a possibility that corrosion and high resistance may occur at the joint due to the local battery effect.

  Then, the objective of this invention is providing the electrode terminal connector which can suppress the corrosion and high resistance in the coupling | bond part of an electrode terminal connector, and its manufacturing method.

  The present invention devised to achieve this object is a positive electrode formed of the same kind of metal as the positive terminal, in an electrode terminal connector for electrically connecting a positive terminal and a negative terminal formed of different metals. A terminal connection portion and a negative electrode terminal connection portion formed of the same metal as the negative electrode terminal, wherein the positive electrode terminal connection portion and the negative electrode terminal connection portion form the positive electrode terminal and the metal It is the electrode terminal connection body couple | bonded through the interposition part formed with the metal which has the ionization tendency between the metal to do.

  Further, the present invention provides a method of manufacturing an electrode terminal assembly in which a positive electrode terminal and a negative electrode terminal formed of different kinds of metals are electrically connected to each other, by pressing a thin plate formed of the same metal as the positive electrode terminal. Pressing the first thick plate made of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal. Forming a first metal member having a diameter smaller than that of the first mounting hole, inserting the first metal member into the first mounting hole, and inside the first mounting hole. Joining the thin plate and the first metal member while squeezing the first metal member to expand the first attachment hole; and an inner peripheral portion of the first attachment hole. The center of the first metal member so that the metal member remains Forming a second mounting hole by pressing the second thick plate formed of the same metal as that of the negative electrode terminal, and pressing the second thick plate with a second diameter smaller than that of the second mounting hole. Forming the second metal member, inserting the second metal member into the second mounting hole, and squeezing the second metal member into the second mounting hole. A step of joining the first metal member and the second metal member while expanding a mounting hole of the electrode terminal assembly.

  A step of pressing the thin plate to form a positive electrode terminal fixing hole; and a center of the second metal member so that the second metal member remains in an inner peripheral portion of the second mounting hole. And a step of forming a negative electrode terminal fixing hole by pressing the part.

  Further, the present invention provides a method of manufacturing an electrode terminal assembly in which a positive electrode terminal and a negative electrode terminal formed of different metals are electrically connected to each other, and press-working a thin plate formed of the same metal as the negative electrode terminal. Pressing the first thick plate made of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal. Forming a first metal member having a diameter smaller than that of the first mounting hole, inserting the first metal member into the first mounting hole, and inside the first mounting hole. Joining the thin plate and the first metal member while squeezing the first metal member to expand the first attachment hole; and an inner peripheral portion of the first attachment hole. The center of the first metal member so that the metal member remains Forming a second mounting hole by pressing the second thick plate formed of the same metal as that of the positive electrode terminal, and pressing the second thick plate with a second diameter smaller than that of the second mounting hole. Forming the second metal member, inserting the second metal member into the second mounting hole, and squeezing the second metal member into the second mounting hole. A step of joining the first metal member and the second metal member while expanding a mounting hole of the electrode terminal assembly.

  A step of pressing the thin plate to form a fixing hole for a negative electrode terminal, and a center of the second metal member so that the second metal member remains in an inner peripheral portion of the second mounting hole. And a step of pressing the part to form a positive terminal fixing hole.

  Further, the present invention provides a method for manufacturing an electrode terminal assembly in which a positive electrode terminal and a negative electrode terminal formed of different metals are electrically connected to each other, and presses the first plate material formed of the same metal as the positive electrode terminal. A step of forming a first mounting hole by processing, and pressing a second plate formed of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal Forming a first metal member having a diameter larger than that of the first attachment hole, and press-fitting the first metal member into the first attachment hole, and the first plate member A step of joining the first metal member, and pressing the central portion of the first metal member so that the first metal member remains in an inner peripheral portion of the first mounting hole; And forming the second mounting hole with the same kind of metal as the negative electrode terminal. Forming a second metal member having a diameter larger than that of the second attachment hole by pressing the formed third plate member; and the second metal member inside the second attachment hole. Press-fitting and joining the first metal member and the second metal member.

  A step of pressing the first plate member to form a positive electrode terminal fixing hole; and the second metal member so that the second metal member remains in an inner peripheral portion of the second mounting hole. It is preferable to further include a step of forming a negative electrode terminal fixing hole by pressing the central portion of the member.

  Further, the present invention provides a method for manufacturing an electrode terminal assembly in which a positive electrode terminal and a negative electrode terminal formed of different metals are electrically connected to each other, and the first plate material formed of the same metal as the negative electrode terminal is pressed. A step of forming a first mounting hole by processing, and pressing a second plate formed of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal Forming a first metal member having a diameter larger than that of the first attachment hole, and press-fitting the first metal member into the first attachment hole, and the first plate member A step of joining the first metal member, and pressing the central portion of the first metal member so that the first metal member remains in an inner peripheral portion of the first mounting hole; And forming the second mounting hole with the same metal as the positive terminal. Forming a second metal member having a diameter larger than that of the second attachment hole by pressing the formed third plate member; and the second metal member inside the second attachment hole. Press-fitting and joining the first metal member and the second metal member.

  A step of pressing the first plate member to form a negative electrode terminal fixing hole; and the second metal member so that the second metal member remains in an inner peripheral portion of the second mounting hole. And a step of forming a positive electrode terminal fixing hole by pressing the central portion of the member.

  It is preferable to further include a step of heating in an inert atmosphere after joining the first metal member and the second metal member.

  ADVANTAGE OF THE INVENTION According to this invention, the electrode terminal connector which can suppress the corrosion and high resistance increase in the coupling | bond part of an electrode terminal connector, and its manufacturing method can be provided.

It is a figure which shows the electrode terminal connector which concerns on this invention, (a) is a top view, (b) is an AA sectional view. It is a perspective view which shows the battery system which connected the some nonaqueous electrolyte secondary battery in series via the electrode terminal connection body of FIG. (A)-(h) is a figure explaining the manufacturing method (expanded type) of the electrode terminal connector which concerns on this invention. (A)-(h) is a figure explaining the manufacturing method (press-fit type) of the electrode terminal connector which concerns on this invention.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  First, the electrode terminal connector will be described.

  As shown in FIGS. 1 and 2, the electrode terminal connector 10 according to the present embodiment electrically connects a positive electrode terminal 11 and a negative electrode terminal 12 that are formed of different metals to each other. 11 and a negative electrode terminal connection portion 14 formed of the same kind of metal as the negative electrode terminal 12, and the positive terminal connection portion 13 and the negative terminal connection portion 14 of the positive electrode terminal connection portion 14 are formed of the positive electrode terminal. 11 and the metal forming the negative electrode terminal 12 are connected to each other through an intervening portion 15 formed of a metal having an ionization tendency.

  The positive electrode terminal 11 and the negative electrode terminal 12 are provided so as to extend from the nonaqueous electrolyte secondary battery 16, respectively. The positive electrode terminal 11 is made of aluminum or an aluminum alloy, and the negative electrode terminal 12 is made of copper or a copper alloy.

  The plurality of non-aqueous electrolyte secondary batteries 16 are connected in series and parallel via the electrode terminal connector 10 and constitute, for example, a battery system mounted as power for an electric vehicle or a hybrid vehicle.

  The positive terminal connecting portion 13 is a portion that is electrically connected to the positive terminal 11, and the negative terminal connecting portion 14 is a portion that is electrically connected to the negative terminal 12.

  Here, the same type of metal as the positive electrode terminal 11 is used as the main base material, and the negative electrode terminal connection unit 14 is provided in a part of the positive electrode terminal connection unit 13, but the same type of metal as the negative electrode terminal 12 is used as the main base material. The positive electrode terminal connection part 13 may be provided in a part of the negative electrode terminal connection part 14.

  A positive terminal fixing hole 17 for inserting the positive terminal 11 and fixing it by resistance welding or the like is formed in the positive terminal connection part 13, and a negative terminal 12 is inserted into the negative terminal connection part 14 and resistance welding is performed. A negative electrode terminal fixing hole 18 for fixing by, for example, is formed.

  The interposition part 15 is for suppressing corrosion and high resistance in the joint part of the positive electrode terminal connection part 13 and the negative electrode terminal connection part 14, and is formed of, for example, nickel, chromium, or zinc.

  Here, the metal that forms the interposition part 15 is selected depending on the ionization tendency. However, in addition to the ionization tendency, the standard electrode located between the metal that forms the positive electrode terminal 11 and the metal that forms the negative electrode terminal 12. You may make it select the metal which has an electric potential as a metal which forms the interposition part 15. FIG. This is because the ionization permutation indicating the ionization tendency and the electrochemical sequence indicating the standard electrode potential expressed using hydrogen as a reference electrode coincide with each other.

  According to the electrode terminal connector 10 according to the present embodiment, the positive electrode terminal connection portion 13 and the negative electrode terminal connection portion 14 exhibit an ionization tendency between the metal forming the positive electrode terminal 11 and the metal forming the negative electrode terminal 12. Since it is coupled via the intervening portion 15 formed of the metal having, the change in ionization tendency at the coupling interface between the positive electrode terminal connecting portion 13 and the negative electrode terminal connecting portion 14, and the potential difference of the standard electrode potential at the coupling interface is alleviated. Therefore, it is possible to make it difficult for corrosion and high resistance due to the local battery effect to occur in the joint portion of the electrode terminal connector 10.

  Next, the manufacturing method of an electrode terminal connector will be described. Since there are mainly an expansion type manufacturing method and a press-fitting type manufacturing method as a manufacturing method of the electrode terminal connector, these manufacturing methods will be described in order.

  First, the expansion type manufacturing method will be described.

  As shown in FIG. 3, the expansion type manufacturing method forms a first mounting hole 32 by pressing a thin plate 31 made of the same metal as the positive electrode terminal 11, and forms the positive electrode terminal 11. A first thick plate (not shown) formed of a metal having an ionization tendency between the metal and the metal forming the negative electrode terminal 12 is subjected to press working to have a first diameter smaller than that of the first mounting hole 32. The first metal member 33 is inserted into the first mounting hole 32 and the first metal member 33 is crushed inside the first mounting hole 32 to form the first metal member 33. The step of joining the thin plate 31 and the first metal member 33 while expanding the attachment hole 32 of the first attachment member 32, and the first metal member 33 so that the first metal member 33 remains on the inner peripheral portion of the first attachment hole 32. The process of forming the second mounting hole 34 by pressing the central portion of the metal member 33 Forming a second metal member 35 having a smaller diameter than the second mounting hole 34 by pressing a second thick plate (not shown) made of the same metal as the negative electrode terminal 12; The second metal member 35 is inserted into the second mounting hole 34, and the second metal member 35 is crushed inside the second mounting hole 34 to expand the second mounting hole 34. A step of joining the metal member 33 and the second metal member 35 to each other.

  In FIG. 3, for convenience of explanation, some lines in the cross-sectional view are omitted.

  Hereafter, each process is demonstrated concretely.

  In the step of forming the first mounting hole 32 by pressing the thin plate 31 formed of the same metal as the positive electrode terminal 11, the thin plate 31 formed of aluminum or aluminum alloy is pressed (particularly stamped). Then, the first mounting hole 32 is formed, and further the positive terminal fixing hole 17 is formed to produce the positive terminal connecting portion 13 (see FIG. 3A). Immediately after this step, no oxide film is formed on the inner peripheral surface of the first mounting hole 32.

  As a result, when the positive electrode terminal 11 is inserted into the positive electrode terminal fixing hole 17 and fixed by resistance welding or the like, the positive electrode terminal 11 and the thin plate 31 of the same kind of metal are in contact with each other. can do.

  The first thick plate formed of a metal having an ionization tendency between the metal forming the positive electrode terminal 11 and the metal forming the negative electrode terminal 12 is subjected to press working and has a diameter smaller than that of the first mounting hole 32. In the step of forming the first metal member 33, the first thick plate formed of nickel, chromium, zinc, or the like is subjected to press working (particularly punching) to form the first metal member 33 serving as the interposition part 15. Form. Since the thickness of the first thick plate is larger than the thickness of the thin plate 31, the thickness of the first metal member 33 is also thicker than the thickness of the thin plate 31.

  Here, the metal that forms the first thick plate is selected depending on the ionization tendency, but in addition to the ionization tendency, the metal is located between the metal that forms the positive electrode terminal 11 and the metal that forms the negative electrode terminal 12. A metal having a standard electrode potential may be selected as a metal forming the first thick plate. This is because the ionization permutation indicating the ionization tendency and the electrochemical sequence indicating the standard electrode potential expressed using hydrogen as a reference electrode coincide with each other.

  The first metal member 33 is inserted into the first mounting hole 32, and the first metal member 33 is crushed inside the first mounting hole 32 to expand the first mounting hole 32 and the thin plate 31. In the step of joining the first metal member 33 and the first metal member 33, the first metal member 33 is crushed inside the first mounting hole 32 by a punching punch of a press device (see FIGS. 3B and 3C). .

  At this time, the first metal member 33 is crushed and rolled to be larger than the inner diameter of the first mounting hole 32, and the first mounting hole 32 is expanded accordingly. As a result, even if a slight oxide film is formed on the inner peripheral surface of the first mounting hole 32, the oxide film is destroyed just before joining, and the creation of a new surface is promoted. The nickel of the metal member 33 is diffusion-bonded.

  Therefore, the aluminum of the thin plate 31 and the nickel of the first metal member 33 are bonded to each other, but this bonding is a diffusion in which the two metal surfaces are integrated in a metallographic state in a solid state. Since it is based on joining, joining reliability can be improved and corrosion and high resistance due to the local battery effect can be suppressed.

  In addition, since aluminum or the like of the thin plate 31 and nickel or the like of the first metal member 33 are close to ionization, even if these dissimilar metals are joined together, the corrosion and high resistance due to the joint local battery effect are fundamental. It is difficult to occur.

  In the step of forming the second mounting hole 34 by pressing the central portion of the first metal member 33 so that the first metal member 33 remains in the inner peripheral portion of the first mounting hole 32, The first metal member 33 is pressed (particularly punched) so that the first metal member 33 remains with a sufficient radial thickness over the entire inner circumference of the first mounting hole 32. (See FIG. 3 (d)).

  Thereby, when inserting the 2nd metal member 35 in the 2nd attachment hole 34 in a post process, and joining the 1st metal member 33 and the 2nd metal member 35, dissimilar metals with a close ionization tendency Will be in contact with each other, and corrosion and high resistance due to the local battery effect can be effectively suppressed.

  In the step of forming a second metal member 35 having a diameter smaller than that of the second mounting hole 34 by pressing the second thick plate formed of the same kind of metal as that of the negative electrode terminal 12, the second thick member 34 is formed of copper or a copper alloy. The second thick plate is pressed (particularly punched) to form the second metal member 35. Since the thickness of the second thick plate is thicker than the thickness of the thin plate 31, the thickness of the second metal member 35 is also thicker than the thickness of the thin plate 31.

  The second metal member 35 is inserted into the second mounting hole 34 and the second metal member 35 is crushed inside the second mounting hole 34 to expand the second mounting hole 34 while the first mounting hole 34 is expanded. In the step of joining the metal member 33 and the second metal member 35, the second metal member 35 is crushed inside the second mounting hole 34 by a punching punch of a press device (FIG. 3 (e) and ( f)).

  At this time, the second metal member 35 is crushed and rolled to be larger than the inner diameter of the second mounting hole 34, and the second mounting hole 34 is expanded accordingly. As a result, even if a slight oxide film is formed on the inner peripheral surface of the second mounting hole 34, the oxide film is destroyed just before joining and the creation of a new surface is promoted, and the nickel of the first metal member 33 is promoted. And the second metal member 35 are diffusion-bonded.

  For this reason, nickel or the like of the first metal member 33 and copper or the like of the second metal member 35 are bonded to each other, but this bonding is performed in a metallurgical manner with the two metal surfaces in a solid state. Therefore, the reliability of the joint can be improved, and corrosion and high resistance due to the local battery effect can be suppressed.

  Moreover, since nickel etc. of the 1st metal member 33 and copper etc. of the 2nd metal member 35 have a near ionization tendency, even if these dissimilar metals are joined, corrosion and high resistance by a joining local battery effect are carried out. Is unlikely to occur in principle.

  Since pressing is faster than other processing methods, these steps are continuously performed by a pressing device, so that the thin plate 31 and the first metal member 33 are formed from the formation of the first mounting hole 32. From the formation of the second mounting hole 34 to the joining of the first metal member 33 and the second metal member 35 can be performed in a short time. Therefore, even if it is an aluminum type oxide film that is formed on the surface of aluminum or aluminum alloy and is known to be very stable once formed, it is difficult to disappear even if diffusion bonding by annealing is performed. , Its growth can be minimized and bonded. Furthermore, even if an oxide film is slightly formed, by performing bonding by expansion, creation of a new surface can be promoted, and sufficient bonding strength between different metals can be obtained.

  In order to carry out each process continuously with a press device, for example, each process is divided into processing stages (bases) and the processing stage is changed by a conveyor as the process proceeds. It ’s fine.

  After these steps, the second metal member 35 joined to the thin plate 31 via the first metal member 33 is pressed (particularly punched) to form the negative electrode terminal fixing hole 18 to form the negative electrode terminal. The connection part 14 is produced (refer FIG.3 (g)).

  At this time, the negative electrode terminal fixing hole 18 is formed by pressing the central portion of the second metal member 35 so that the second metal member 35 remains in the inner peripheral portion of the second mounting hole 34. .

  Thereby, when the negative electrode terminal 12 is inserted into the negative electrode terminal fixing hole 18 and fixed by resistance welding or the like, the negative electrode terminal 12 of the same kind of metal and the second metal member 35 come into contact with each other. It can be set as a joint between each other.

  When forming the negative electrode terminal fixing hole 18, the first metal member 33 is exposed on the inner peripheral surface of the negative electrode terminal fixing hole 18 in contact with the negative electrode terminal 12 so as not to join different metals. It is better not to.

  Moreover, it is preferable that the expansion type manufacturing method further includes a step of heating in an inert atmosphere after joining the first metal member 33 and the second metal member 35 (see FIG. 3H).

  As a result, diffusion bonding of aluminum or the like of the thin plate 31 and nickel or the like of the first metal member 33 and diffusion bonding of nickel or the like of the first metal member 33 and copper of the second metal member 35 sufficiently proceed. In addition, the bonding strength can be further increased.

  As the inert atmosphere, a helium gas atmosphere or an argon gas atmosphere can be used. The heating temperature is set to a temperature equal to or lower than the melting point of the thin plate 31, the first metal member 33, and the second metal member 35 that are the base materials.

  When the nonaqueous electrolyte secondary battery 16 is connected in series and parallel via the electrode terminal connector 10 obtained by the above steps, the positive terminal fixing hole 17 of the electrode terminal connector 10 and the nonaqueous electrolyte secondary battery are connected. The positive electrode terminal 11 of 16 is fixed by resistance welding or the like, and the negative electrode terminal fixing hole 18 of the electrode terminal connector 10 and the negative electrode terminal 12 of another nonaqueous electrolyte secondary battery 16 are fixed by resistance welding or the like. The terminal 11 and the negative electrode terminal 12 are electrically connected.

  At this time, the positive terminal fixing hole 17 in contact with the positive terminal 11 is formed of the thin plate 31 that is the same kind of metal as the positive terminal 11, and the negative terminal fixing hole 18 in contact with the negative terminal 12 is the same kind of metal as the negative terminal 12. Since the second metal member 35 is formed of the same metal, the same kind of metal is joined to each other, and in principle, corrosion and high resistance due to the local battery effect can be prevented.

  Moreover, since it is joining of the same kind metals, it becomes possible to employ | adopt simple things, such as resistance welding, as a technique of joining metals.

  Next, a press-fitting type manufacturing method will be described.

  As shown in FIG. 4, the press-fitting type manufacturing method includes a step of forming a first mounting hole 32 by pressing a first plate material 41 made of the same metal as the positive electrode terminal 11, and the positive electrode terminal 11. The second plate member (not shown) formed of a metal having an ionization tendency between the metal forming the negative electrode 12 and the metal forming the negative electrode terminal 12 is subjected to press working to have a diameter larger than that of the first mounting hole 32. A step of forming the first metal member 33, a step of press-fitting the first metal member 33 into the first mounting hole 32, and joining the first plate member 41 and the first metal member 33; Forming the second mounting hole 34 by pressing the central portion of the first metal member 33 so that the first metal member 33 remains in the inner peripheral portion of the first mounting hole 32; The third plate (not shown) made of the same metal as the negative electrode terminal 12 is pressed. Forming a second metal member 35 having a diameter larger than that of the second mounting hole 34, and press-fitting the second metal member 35 into the second mounting hole 34, And a step of joining the second metal member 35 to each other.

  In FIG. 4, for convenience of explanation, some lines in the cross-sectional view are omitted.

  Hereafter, each process is demonstrated concretely.

  In the step of forming the first mounting hole 32 by pressing the first plate material 41 formed of the same kind of metal as the positive electrode terminal 11, the first plate material 41 formed of aluminum or aluminum alloy is pressed ( In particular, the first mounting hole 32 is formed by performing punching processing, and the positive terminal fixing hole 17 is further formed to manufacture the positive terminal connecting portion 13 (see FIG. 4A). Immediately after this step, no oxide film is formed on the inner peripheral surface of the first mounting hole 32.

  A second plate made of a metal having an ionization tendency between the metal forming the positive electrode terminal 11 and the metal forming the negative electrode terminal 12 is subjected to press working to have a diameter larger than that of the first mounting hole 32. In the step of forming the first metal member 33, the second metal plate formed of nickel, chromium, zinc, or the like is subjected to press working (particularly punching) to form the first metal member 33 serving as the interposition part 15. To do. Since the thickness of the second plate material is equivalent to the thickness of the first plate material 41, the thickness of the first metal member 33 is also equivalent to the thickness of the first plate material 41.

  Here, the metal that forms the second plate material is selected according to the ionization tendency. However, in addition to the ionization tendency, the standard that is located between the metal that forms the positive electrode terminal 11 and the metal that forms the negative electrode terminal 12. You may make it select the metal which has electrode potential as a metal which forms a 2nd board | plate material. This is because the ionization permutation indicating the ionization tendency and the electrochemical sequence indicating the standard electrode potential expressed using hydrogen as a reference electrode coincide with each other.

  In the step of press-fitting the first metal member 33 into the first mounting hole 32 and joining the first plate member 41 and the first metal member 33, the first mounting hole 32 is punched by a press device. The first metal member 33 is pushed into the inside (see FIGS. 4B and 4C).

  At this time, the first metal member 33 and the first mounting hole 32 come into contact with each other, and the surfaces of each of the first metal member 33 and the first mounting hole 32 are scraped and plastically deformed, and the first metal member 33 is pushed into the first mounting hole 32. It is. As a result, even if a slight oxide film is formed on the inner peripheral surface of the first mounting hole 32, the oxide film is destroyed just before joining, and the creation of a new surface is promoted. And nickel of the first metal member 33 are diffusion bonded.

  For this reason, the aluminum of the first plate 41 and the nickel of the first metal member 33 are bonded to each other, but this bonding is performed in a metallurgical manner with the two metal surfaces in a solid state. Since the diffusion bonding is performed, the bonding reliability can be improved, and corrosion and high resistance due to the local battery effect can be suppressed.

  Moreover, since the aluminum of the first plate 41 and the nickel of the first metal member 33 have a similar ionization tendency, even if these dissimilar metals are joined together, corrosion and high resistance are achieved by the joint local cell effect. Is unlikely to occur in principle.

  In the step of forming the second mounting hole 34 by pressing the central portion of the first metal member 33 so that the first metal member 33 remains in the inner peripheral portion of the first mounting hole 32, The first metal member 33 is pressed (particularly punched) so that the first metal member 33 remains with a sufficient radial thickness over the entire inner circumference of the first mounting hole 32. (Refer FIG.4 (d)).

  As a result, when the second metal member 35 is press-fitted into the second mounting hole 34 in a later step and the first metal member 33 and the second metal member 35 are joined together, dissimilar metals having similar ionization tendencies Will be in contact with each other, and corrosion and high resistance due to the local battery effect can be effectively suppressed.

  In the step of forming a second metal member 35 having a diameter larger than that of the second mounting hole 34 by pressing a third plate formed of the same kind of metal as that of the negative electrode terminal 12, it is formed of copper or a copper alloy. The second metal member 35 is formed by pressing (particularly punching) the third plate material. Since the thickness of the third plate member is equivalent to the thickness of the first plate member 41, the thickness of the second metal member 35 is also equivalent to the thickness of the first plate member 41.

  In the step of press-fitting the second metal member 35 into the second mounting hole 34 and joining the first metal member 33 and the second metal member 35, the second mounting hole is formed by a punching punch of a press device. The second metal member 35 is pushed into the interior of 34 (see FIGS. 4E and 4F).

  At this time, the second metal member 35 and the second mounting hole 34 come into contact with each other, and the surfaces of each of the second metal member 35 and the second mounting hole 34 are scraped and plastically deformed, and the second metal member 35 is pushed into the second mounting hole 34. It is. As a result, even if a slight oxide film is formed on the inner peripheral surface of the second mounting hole 34, the oxide film is destroyed just before joining and the creation of a new surface is promoted, and the nickel of the first metal member 33 is promoted. And the second metal member 35 are diffusion-bonded.

  For this reason, nickel or the like of the first metal member 33 and copper or the like of the second metal member 35 are bonded to each other, but this bonding is performed in a metallurgical manner with the two metal surfaces in a solid state. Therefore, the reliability of the joint can be improved, and corrosion and high resistance due to the local battery effect can be suppressed.

  Moreover, since nickel etc. of the 1st metal member 33 and copper etc. of the 2nd metal member 35 have a near ionization tendency, even if these dissimilar metals are joined, corrosion and high resistance by a joining local battery effect are carried out. Is unlikely to occur in principle.

  Since pressing is faster than other processing methods, these steps are continuously performed by a pressing device, so that the first plate 41 and the first metal are formed from the formation of the first mounting hole 32. The joining from the member 33 and the formation of the second mounting hole 34 to the joining of the first metal member 33 and the second metal member 35 can be performed in a short time. Therefore, even if it is an aluminum type oxide film that is formed on the surface of aluminum or aluminum alloy and is known to be very stable once formed, it is difficult to disappear even if diffusion bonding by annealing is performed. , Its growth can be minimized and bonded. Furthermore, even if an oxide film is formed slightly, by performing press-fitting bonding, creation of a new surface can be promoted and sufficient bonding strength between different metals can be obtained.

  In order to carry out each process continuously with a press device, for example, each process is divided into processing stages (bases) and the processing stage is changed by a conveyor as the process proceeds. It ’s fine.

  After these steps, the second metal member 35 joined to the first plate member 41 via the first metal member 33 is pressed (particularly stamped) to form the negative electrode terminal fixing hole 18. Thus, the negative electrode terminal connecting portion 14 is manufactured (see FIG. 4G).

  At this time, the negative electrode terminal fixing hole 18 is formed by pressing the central portion of the second metal member 35 so that the second metal member 35 remains in the inner peripheral portion of the second mounting hole 34. .

  Thereby, when the negative electrode terminal 12 is inserted into the negative electrode terminal fixing hole 18 and fixed by resistance welding or the like, the negative electrode terminal 12 of the same kind of metal and the second metal member 35 come into contact with each other. It can be set as a joint between each other.

  When forming the negative electrode terminal fixing hole 18, the first metal member 33 is exposed on the inner peripheral surface of the negative electrode terminal fixing hole 18 in contact with the negative electrode terminal 12 so as not to join different metals. It is better not to.

  Moreover, it is preferable that the press-fitting type manufacturing method further includes a step of heating in an inert atmosphere after joining the first metal member 33 and the second metal member 35 (see FIG. 4H).

  Thereby, diffusion bonding of aluminum or the like of the first plate member 41 and nickel or the like of the first metal member 33 and diffusion bonding of nickel or the like of the first metal member 33 and copper of the second metal member 35 are performed. It can be sufficiently advanced to increase the bonding strength.

  As the inert atmosphere, a helium gas atmosphere or an argon gas atmosphere can be used. The heating temperature is set to a temperature equal to or lower than the melting point of the first plate member 41, the first metal member 33, and the second metal member 35, which are base materials.

  When the nonaqueous electrolyte secondary battery 16 is connected in series and parallel via the electrode terminal connector 10 obtained by the above steps, the positive terminal fixing hole 17 of the electrode terminal connector 10 and the nonaqueous electrolyte secondary battery are connected. The positive electrode terminal 11 of 16 is fixed by resistance welding or the like, and the negative electrode terminal fixing hole 18 of the electrode terminal connector 10 and the negative electrode terminal 12 of another nonaqueous electrolyte secondary battery 16 are fixed by resistance welding or the like. The terminal 11 and the negative electrode terminal 12 are electrically connected.

  At this time, the positive terminal fixing hole 17 in contact with the positive terminal 11 is formed of the first plate material 41 made of the same metal as the positive terminal 11, and the negative terminal fixing hole 18 in contact with the negative terminal 12 is formed in the negative terminal 12. Since the second metal member 35 is made of the same kind of metal, the same kind of metal is joined to each other, and in principle, corrosion and high resistance due to the local battery effect can be prevented.

  Moreover, since it is joining of the same kind metals, it becomes possible to employ | adopt simple things, such as resistance welding, as a technique of joining metals.

  Next, the effect of the manufacturing method of an electrode terminal connector will be described.

  The electrode terminal connector described in Patent Document 1 or 2 is manufactured by forming an intermediate product in which dissimilar metals are combined by hydrostatic extrusion, and cutting the intermediate product into a plate shape of the electrode terminal connector. The

  Large-scale equipment is required to achieve hydrostatic extrusion, and it takes a long time to cut the intermediate product into a plate shape and waste of chips increases, resulting in a significant increase in manufacturing costs. It is estimated that

  Patent Document 2 also discloses that an electrode terminal connector is manufactured by forming a mounting hole in a plate material and press-fitting a metal member formed of a different metal into the mounting hole. There is a possibility that an oxide film grows on the surface of aluminum or an aluminum alloy before the metal member is press-fitted into the hole, and sufficient bonding strength between different metals cannot be obtained.

  On the other hand, according to the manufacturing method of the electrode terminal connector according to the present embodiment, the steps from the formation of the first mounting hole 32 to the joining of the second metal member 35 are excellent in processing speed and are hydrostatic. Since it is performed by press working that can be performed with small-scale equipment as compared with extrusion processing, large-scale equipment is not required, and the process from the formation of the first mounting hole 32 to the joining of the second metal member 35 is completed in a short time. It is possible to implement.

  Moreover, in the manufacturing method of the electrode terminal connector, the processing speed of the process from the formation of the first mounting hole 32 to the joining of the second metal member 35 is higher than that in the case of using both hydrostatic extrusion and cutting. Therefore, the growth of the oxide film during processing can be suppressed.

  Furthermore, in the manufacturing method of the electrode terminal connector, when the first mounting hole 32 and the first metal member 33 are joined, and when the second mounting hole 34 and the second metal member 35 are joined, Even if a slight oxide film is formed on the inner peripheral surface of the first mounting hole 32 or the second mounting hole 34, the oxide film can be broken immediately before bonding, and dissimilar metals are diffusion bonded. Therefore, sufficient bonding strength can be obtained between different metals.

  In other words, according to the method for manufacturing an electrode terminal assembly according to the present embodiment, since a large-scale facility is not required, it is possible to perform from the formation of the mounting hole to the joining of the metal member in a short time. Thus, it is possible to manufacture the electrode terminal assembly 10 that can suppress the growth of the oxide film to the minimum and can be bonded, and can obtain a sufficient bonding strength between different metals.

  The present invention is not limited to this embodiment, and various modifications can be made without departing from the scope of the present invention.

  For example, in the present embodiment, the thin plate 31 or the first plate material 41 is formed of aluminum or the like that is the same metal as the positive electrode terminal 11, and the second metal member 35 is formed of copper or the like that is the same metal as the negative electrode terminal 12. However, the thin plate 31 or the first plate 41 may be formed of copper or the like that is the same metal as the negative electrode terminal 12, and the second metal member 35 may be formed of aluminum or the like that is the same metal as the positive electrode terminal 11.

  Also in this case, when the first mounting hole 32 and the first metal member 33 are joined, and when the second mounting hole 34 and the second metal member 35 are joined, the first mounting hole is used. Even if an oxide film is slightly formed on the inner peripheral surface of 32 or the second mounting hole 34, the oxide film is destroyed by expansion or press-fitting, and the creation of a new surface is promoted, and sufficient bonding strength between different metals Is obtained.

  Further, in this embodiment, in the expansion type manufacturing method, all bonding is performed by expansion, and in the press-fitting type manufacturing method, all bonding is performed by press-fitting. However, the expansion bonding and the bonding by press-fitting are combined. It doesn't matter.

  As described above, according to the present invention, it is possible to provide an electrode terminal connector and a method for manufacturing the same that can suppress corrosion and increase in resistance at the joint portion of the electrode terminal connector.

DESCRIPTION OF SYMBOLS 10 Electrode terminal connection body 11 Positive electrode terminal 12 Negative electrode terminal 13 Positive electrode terminal connection part 14 Negative electrode terminal connection part 15 Interposition part 16 Nonaqueous electrolyte secondary battery 17 Positive electrode terminal fixing hole 18 Negative electrode terminal fixing hole

Claims (10)

In the electrode terminal connection body that electrically connects the positive electrode terminal and the negative electrode terminal formed of different metals,
A positive terminal connecting portion formed of the same metal as the positive terminal;
A negative terminal connecting portion formed of the same metal as the negative terminal;
With
The positive electrode terminal connecting portion and the negative electrode terminal connecting portion are coupled via an intervening portion formed of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal. An electrode terminal connector characterized by that. In the method of manufacturing an electrode terminal assembly for electrically connecting a positive electrode terminal and a negative electrode terminal formed of different metals from each other,
Forming a first mounting hole by pressing a thin plate made of the same metal as the positive electrode terminal; and
The first thick plate made of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal is subjected to press working to have a diameter smaller than that of the first mounting hole. Forming a metal member of 1;
The first metal member is inserted into the first mounting hole, and the first metal member is crushed inside the first mounting hole to expand the first mounting hole and the thin plate. And joining the first metal member;
Forming a second mounting hole by pressing the central portion of the first metal member so that the first metal member remains on the inner peripheral portion of the first mounting hole;
Forming a second metal member having a diameter smaller than that of the second mounting hole by pressing a second thick plate formed of the same metal as the negative electrode terminal;
The second metal member is inserted into the second mounting hole, and the second metal member is crushed inside the second mounting hole to expand the second mounting hole. Joining the first metal member and the second metal member;
A method for producing an electrode terminal assembly, comprising: Forming a positive electrode terminal fixing hole by pressing the thin plate; and
Forming a negative electrode terminal fixing hole by pressing the central portion of the second metal member so that the second metal member remains on the inner peripheral portion of the second mounting hole;
The manufacturing method of the electrode terminal connector of Claim 2 further equipped with these. In the method of manufacturing an electrode terminal assembly for electrically connecting a positive electrode terminal and a negative electrode terminal formed of different metals from each other,
Forming a first mounting hole by pressing a thin plate made of the same metal as the negative electrode terminal; and
The first thick plate made of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal is subjected to press working to have a diameter smaller than that of the first mounting hole. Forming a metal member of 1;
The first metal member is inserted into the first mounting hole, and the first metal member is crushed inside the first mounting hole to expand the first mounting hole and the thin plate. And joining the first metal member;
Forming a second mounting hole by pressing the central portion of the first metal member so that the first metal member remains on the inner peripheral portion of the first mounting hole;
Forming a second metal member having a smaller diameter than the second mounting hole by pressing the second thick plate formed of the same metal as the positive electrode terminal;
The second metal member is inserted into the second mounting hole, and the second metal member is crushed inside the second mounting hole to expand the second mounting hole. Joining the first metal member and the second metal member;
A method for producing an electrode terminal assembly, comprising: Forming a negative electrode terminal fixing hole by pressing the thin plate; and
Forming a positive electrode terminal fixing hole by pressing the central portion of the second metal member so that the second metal member remains on the inner peripheral portion of the second mounting hole;
The manufacturing method of the electrode terminal connector of Claim 4 further equipped with these. In the method of manufacturing an electrode terminal assembly for electrically connecting a positive electrode terminal and a negative electrode terminal formed of different metals from each other,
Forming a first mounting hole by pressing the first plate made of the same metal as the positive electrode terminal; and
The second plate member formed of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal is subjected to press working to have a diameter larger than that of the first mounting hole. Forming a metal member of 1;
Press-fitting the first metal member into the first mounting hole to join the first plate member and the first metal member;
Forming a second mounting hole by pressing the central portion of the first metal member so that the first metal member remains on the inner peripheral portion of the first mounting hole;
Forming a second metal member having a diameter larger than that of the second mounting hole by pressing a third plate formed of the same metal as the negative electrode terminal;
Press-fitting the second metal member into the second mounting hole to join the first metal member and the second metal member;
A method for producing an electrode terminal assembly, comprising: Forming a positive electrode terminal fixing hole by pressing the first plate member; and
Forming a negative electrode terminal fixing hole by pressing the central portion of the second metal member so that the second metal member remains on the inner peripheral portion of the second mounting hole;
The manufacturing method of the electrode terminal connector of Claim 6 further equipped with these. In the method of manufacturing an electrode terminal assembly for electrically connecting a positive electrode terminal and a negative electrode terminal formed of different metals from each other,
Forming a first mounting hole by pressing a first plate material made of the same metal as the negative electrode terminal;
The second plate member formed of a metal having an ionization tendency between the metal forming the positive electrode terminal and the metal forming the negative electrode terminal is subjected to press working to have a diameter larger than that of the first mounting hole. Forming a metal member of 1;
Press-fitting the first metal member into the first mounting hole to join the first plate member and the first metal member;
Forming a second mounting hole by pressing the central portion of the first metal member so that the first metal member remains on the inner peripheral portion of the first mounting hole;
Forming a second metal member having a diameter larger than that of the second mounting hole by pressing a third plate formed of the same metal as the positive electrode terminal;
Press-fitting the second metal member into the second mounting hole to join the first metal member and the second metal member;
A method for producing an electrode terminal assembly, comprising: A step of pressing the first plate member to form a negative electrode terminal fixing hole;
Forming a positive electrode terminal fixing hole by pressing the central portion of the second metal member so that the second metal member remains on the inner peripheral portion of the second mounting hole;
The method for manufacturing an electrode terminal connector according to claim 8, further comprising:   The method for manufacturing an electrode terminal assembly according to any one of claims 2 to 9, further comprising a step of heating in an inert atmosphere after joining the first metal member and the second metal member.