JP2014207155A - Manufacturing method of terminal member for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method capable of manufacturing a terminal member 1 for a battery with a high strength and high accuracy and further reducing cost of manufacture when manufacturing the terminal member 1 for the battery comprising: a thin base part 2 having a predetermined contour; an intermediate protrusion 3 protruding in a thickness direction from the base part 2; and a protrusion 4 protruding from an end face of the intermediate protrusion 3 with an outer diameter (d) smaller than an outer diameter D of the intermediate protrusion 3.SOLUTION: A manufacturing method of a terminal member for a battery includes: a processing member preparation step of preparing a processing member in a columnar shape by cutting a wire of which the cross section is circular; a flat surface forming step of forming a flat surface on a side surface of the columnar shape of the processing member; a protrusion forming step of forming the protrusion 4 in the processing member in which the flat surface is formed; an intermediate protrusion forming step of forming the intermediate protrusion 3 and a thin part in the processing member in which the protrusion 4 is formed; and a base part forming step of forming the base part 2 by cutting a peripheral portion of the thin part so as to obtain a predetermined contour.

Description

  The present invention relates to a method for producing a battery terminal member used by being connected to a positive electrode terminal or a negative electrode terminal of a battery such as a lithium ion battery.

  In recent years, lithium ion batteries have been widely used and installed in automobiles and the like with the improvement in performance. In the place where the lithium ion battery is accommodated, respective battery terminal members to which the positive electrode terminal and the negative electrode terminal are connected when accommodated are provided. A lithium ion battery supplies required electric power to other electrical components through these battery terminal members.

  Patent Documents 1 and 2 show examples of battery terminal members. A base connected to a positive terminal or a negative terminal of a battery and other members (between other conductive members and the battery terminal member). And a projecting portion projecting from the base portion to be fixed to the insulating member interposed therebetween. In Patent Document 1, the end of the protruding portion is fixed to another member with a screw, and in Patent Document 2, the end of the protruding portion is fixed to the other member by caulking (by plastic deformation). Yes.

JP 2008-34298 A JP 2012-49076 A

  By the way, as shown in FIG. 1, the required shape of the battery terminal member may not be simple depending on the shape of the lithium ion battery, the arrangement position of other electrical components, and the like.

  A battery terminal member 1 shown in FIG. 1 includes a thin base portion 2 having a predetermined contour, an intermediate protrusion portion 3 protruding in the thickness direction from the base portion 2, and an intermediate protrusion portion 3 extending from an end surface of the intermediate protrusion portion 3. And a projecting portion 4 projecting with an outer diameter d smaller than the outer diameter D. The intermediate protrusion 3 and the protrusion 4 have a cylindrical shape, and a recess 4 a is formed on the end surface of the protrusion 4. Then, either the positive electrode terminal or the negative electrode terminal of the lithium ion battery can be mechanically connected to the back surface 2a of the base 2. Further, the battery terminal member 1 can be fixed in position by mechanically connecting the peripheral surface 4b of the protrusion 4 to another conductive member and the peripheral surface 3a of the intermediate protrusion 3 to an insulating member.

  When manufacturing such a battery terminal member 1, several manufacturing methods are generally conceivable. One is to use a plate material as a raw material and increase the thickness of the intermediate protruding portion 3 and the protruding portion 4 by forging. However, in this manufacturing method, since the total projecting length L of the intermediate projecting portion 3 and the projecting portion 4 is long and there is a stepped portion, it is difficult to form them due to plastic flow.

  The other is as follows. That is, first, a cylindrical workpiece member 101 is formed by cutting a wire having a circular cross section as shown in FIG. Next, as illustrated in FIG. 11B, the outer diameter of the processed member 101 is changed by forging to form the intermediate protruding portion 3 and the protruding portion 4, and the connecting portion 102 is formed in the intermediate protruding portion 3. . In addition to this forging process, a base 2 as shown in FIG. 12B in which an insertion hole 104 is formed by pressing is formed from a plate material 103 as shown in FIG. 12A. Then, the connecting portion 102 is inserted into the insertion hole 104, and the connecting portion 102 is caulked, and the processed member 101 on which the intermediate protruding portion 3 and the like are formed is coupled to the base portion 2 as shown in FIG. In the battery terminal member 1 ′ thus completed, the connecting portion 102 slightly protrudes from the back surface 2 a of the base portion 2.

  However, in the manufacturing method as shown in FIGS. 11 to 13, the processed member 101 formed with the intermediate projecting portion 3 and the like and the base portion 2 are separately manufactured and then combined, so that an external force (for example, an automobile) Etc.), it is likely to cause sparks and poor energization, and the cost for manufacturing with high strength and high accuracy is likely to increase. In addition, since the process itself is complicated, the manufacturing cost tends to increase essentially.

  The present invention has been made in view of the above reasons, and its purpose is to provide a thin base portion having a predetermined contour, an intermediate protrusion portion protruding in the thickness direction from the base portion, and an intermediate portion from the end face of the intermediate protrusion portion. To provide a manufacturing method that can be manufactured with high strength and high accuracy and that can reduce manufacturing costs when manufacturing a battery terminal member including a protruding portion that protrudes with an outer diameter smaller than the outer diameter of the protruding portion. It is.

  In order to achieve the above object, a method of manufacturing a battery terminal member according to claim 1 includes a thin base portion having a predetermined contour, an intermediate protrusion portion protruding in the thickness direction from the base portion, and the intermediate protrusion portion. A projecting portion projecting from the end surface of the portion with an outer diameter smaller than the outer diameter of the intermediate projecting portion, and a cylindrical terminal member by cutting a wire having a circular cross section A machining member creating step to create, a flat surface forming step of forming a flat surface on a cylindrical side surface of the machining member, and a protruding portion forming step of forming the protruding portion on the processed member on which the flat surface is formed; The intermediate projecting portion forming step for forming the intermediate projecting portion and the thin-walled portion on the processed member on which the projecting portion is formed, and the base portion is removed by cutting out the peripheral portion of the thin-walled portion so as to have the predetermined contour. A base forming step to form, And wherein the Mukoto.

  The method for manufacturing a battery terminal member according to claim 2 is a method for manufacturing a battery terminal member comprising: a thin base portion having a predetermined contour; and a protruding portion protruding in the thickness direction from the base portion. A processing member creation step of cutting a wire having a circular cross section to create a cylindrical processing member, a flat surface forming step of forming a flat surface on the cylindrical side surface of the processing member, and the flat surface was formed A projecting portion forming step for forming the projecting portion and the thin portion on the processed member, and a base portion forming step for forming the base portion by cutting a peripheral portion of the thin portion so as to have the predetermined contour. Features.

  The method for manufacturing a battery terminal member according to claim 3 is the method for manufacturing a battery terminal member according to claim 1 or 2, wherein the battery terminal member has a recess formed on an end surface of the protruding portion. The method further includes the step of forming a recess by pressing the processed member with a protrusion of an upper mold after the protrusion forming step.

  The method for manufacturing a battery terminal member according to claim 4 is the method for manufacturing a battery terminal member according to any one of claims 1 to 3, wherein the predetermined contour of the base is substantially rectangular, and the protrusion The portion is formed at a position deviating from the center in the long side direction of the base portion or at the center position.

  The method for manufacturing a battery terminal member according to claim 5 is the method for manufacturing a battery terminal member according to claim 4, wherein the protruding portion is formed at a position deviated from the center in the long side direction of the base portion. In the protruding portion forming step, the upper mold in which the hole portion having a shape corresponding to the protruding portion is formed on the molding surface is placed at a position where the hole portion is out of the center in the long side direction of the flat surface. It arrange | positions so that it may fit, and the said flat surface is pressed with this upper metal mold | die, It is characterized by the above-mentioned.

  According to the battery terminal member manufacturing method of the present invention, the battery terminal member can be manufactured with high strength and high accuracy, and the manufacturing cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS The battery terminal member manufactured by applying the manufacturing method of the battery terminal member which concerns on embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing, (c) is a perspective view. It is. It is a perspective view which shows the shape of the process member in the manufacturing method of the battery terminal member same as the above, Comprising: (a) is a thing after a process member formation process, (b) is a thing after a flat surface formation process. It is the schematic of the manufacturing apparatus for showing a motion of the upper metal mold | die by the manufacturing method of the battery terminal member same as the above, (a) is a flat surface formation process, (b) is a protrusion formation process, (c). Is an intermediate protrusion forming step, (d) is a recess forming step, and (e) is a base forming step. It is a perspective view which shows the shape of the process member in the manufacturing method of the battery terminal member same as the above, Comprising: (a) is a thing after a protrusion part formation process, (b) is a thing after an intermediate | middle protrusion part formation process. It is sectional drawing which shows the shape of the process member after the intermediate | middle protrusion part formation process of the manufacturing method of the battery terminal member same as the above. It is a perspective view which shows the shape of the process member after the recessed part formation process of the manufacturing method of the battery terminal member same as the above. It is an expanded sectional view which shows a part of upper metal mold | die used at the recessed part formation process of the manufacturing method of the battery terminal member same as the above. It is for demonstrating the process member and upper metal mold | die in the protrusion formation process in the manufacturing method of the battery terminal member same as the above, (a) A top view, (b) is sectional drawing. It is a perspective view which shows one example of the battery terminal member manufactured by applying the manufacturing method of the battery terminal member same as the above. It is a perspective view which shows one example of the battery terminal member manufactured by applying the manufacturing method of the battery terminal member same as the above. It is a perspective view which shows the member shape formed at one process in the manufacturing method of the battery terminal member generally considered. It is a perspective view which shows the member shape formed at the other process in the manufacturing method of the battery terminal member generally considered. It is a perspective view which shows the terminal member for batteries manufactured by applying the manufacturing method of the terminal member for batteries generally considered.

  Embodiments of the present invention will be described below. The battery terminal member 1 manufactured by applying the method for manufacturing a battery terminal member according to the embodiment of the present invention includes a thin base 2 having a predetermined contour and the base 2 as shown in FIG. 1 described above. Intermediate protrusion 3 protruding in the thickness direction thereof, and a protrusion 4 protruding from the end surface of the intermediate protrusion 3 with an outer diameter d smaller than the outer diameter D of the intermediate protrusion 3. The intermediate protrusion 3 and the protrusion 4 have a cylindrical shape, and a recess 4 a is formed on the end surface of the protrusion 4.

  The manufacturing method of the battery terminal member according to the embodiment of the present invention includes a processed member creating step, a flat surface forming step, a protruding portion forming step, an intermediate protruding portion forming step, a recess forming step, and a base forming step. , Including. First, a machining member creation step is performed. In this machining member creation step, the wire 10 having a circular cross section is cut to create a cylindrical machining member 11 as shown in FIG. The wire 10 is not limited, but can be copper, aluminum, or other various materials.

  Next, a flat surface forming process is performed. In the flat surface forming step, a flat surface 11 a as shown in FIG. 2B is formed on the cylindrical side surface of the processed member 11. The end surface (end surface in the axial direction) is substantially D-shaped. More specifically, the processing member 11 is held so that the axial direction is horizontal, and the upper mold K1 having a flat molding surface (a surface facing downward) is disposed above the processing member 11. Then, the upper mold K1 is lowered as shown by the arrow in FIG. 3A, and the workpiece 11 is pressed and molded with the upper mold K1. In addition, what is necessary is just to use what was dented with the curvature according to the curvature of the said cylindrical side surface as the lower metal mold | die which hold | maintains the process member 11. FIG.

  When the flat surface 11a is formed by pressing and molding the processed member 11 in this way, the end surface of the protruding portion 4 formed in the protruding portion forming step described below can be made flat with high accuracy.

  Next, a protrusion formation process is performed. In the protruding portion forming step, the flat surface 11a side is processed on the processed member 11 on which the flat surface 11a is formed to form the protruding portion 4 having a protruding shape as shown in FIG. More specifically, the upper die K2 is processed by holding the flat surface 11a of the processing member 11 so as to face upward and forming a hole K2a (see FIG. 8) having a shape corresponding to the protruding portion 4 on the molding surface. Arranged above the member 11. Then, the upper mold K2 is lowered as shown in FIG. 3B, and the workpiece 11 (flat surface 11a) is pressed and molded with the upper mold K2. If it does so, the protrusion part 4 will be formed and the other part will spread sideways.

  In this way, if the protrusion 4 is first formed on the processed member 11 and the protrusion 4 and the intermediate protrusion 3 are not formed at the same time, the influence of plastic flow on molding is extremely reduced. An excessive load due to the shape change of the member 11 can be prevented from being applied to the upper mold K2.

  Next, an intermediate protrusion forming step is performed. In the intermediate projecting portion forming step, the intermediate projecting portion 3 and the thin portion 12 are formed on the processed member 11 on which the projecting portion 4 is formed, as shown in FIG. The intermediate protrusion 3 and the thin portion 12 are formed integrally (integrated). More specifically, the processed member 11 is held so that the surface on which the protruding portion 4 is formed faces upward, and a hole having a shape corresponding to the intermediate protruding portion 3 (and the protruding portion 4) is formed on the lower surface. An upper die K3 having substantially the same contour shape as the predetermined contour is disposed above the processing member 11. Then, the upper mold K3 is lowered as shown in FIG. 3C, and the workpiece 11 is pressed by the upper mold K3 to be molded. If it does so, the intermediate | middle protrusion part 3 will be formed and the thin part 12 with thin thickness will be formed. The peripheral portion 12a of the thin portion 12 where the upper mold K3 is not pressed (not pressed) spreads sideways, or rises upward as shown in FIG.

  Next, a recess forming step is performed. In the recess forming step, as shown in FIG. 6, the recess 4a is formed on the end surface of the protrusion 4 of the processed member 11 on which the protrusion 4, the intermediate protrusion 3, and the thin portion 12 are formed. More specifically, the processing member 11 is held so that the surface on which the protruding portion 4 is formed faces upward, and the upper mold K4 is disposed above the processing member 11. The upper mold K4 has a base K4a having a hole K4aa having a shape corresponding to the intermediate protrusion 3 (and the protrusion 4) as shown in FIG. 7, and a shape corresponding to the recess 4a and independent of the base K4a. And a protrusion K4b that can move up and down. Then, the upper die K4 is lowered as shown in FIG. 3D, and the processing member 11 is pressed by the protrusion K4b to form the recess 4a. At this time, the protrusion length of the protrusion 4 is slightly increased due to plastic flow.

  Thus, the recessed part 4a is formed in the recessed part formation process which is a subsequent process rather than simultaneously with the formation of the protruding part 4 in the protruding part forming process. Thereby, it is possible to prevent an excessive load due to a change in the shape of the processed member 11 from being applied to the upper mold K2 in the protruding portion forming step.

  Next, a base formation process is performed. In the base forming step, the base 2 is formed by cutting away the peripheral portion 12a of the thin portion 12 so as to have a predetermined contour. More specifically, the upper mold K5 having a shape corresponding to the predetermined contour of the base 2 is held on the processing member 11 by holding the processing member 11 so that the surface on which the intermediate protrusion 3 and the protrusion 4 are formed faces upward. Place above. Then, the upper mold K5 is lowered as shown in FIG. 3 (e), and the processing member 11 is pressed with the upper mold K5 to cut out the peripheral portion 12a of the thin portion 12 which is an unnecessary portion.

  According to such a battery terminal member manufacturing method, the battery terminal member 1 is integrally (integrated) by processing one processing member 11 with the base 2, the intermediate protrusion 3, and the protrusion 4. ) Molded. Thereby, the tensile strength of the intermediate | middle protrusion part 3, the tensile strength of the protrusion part 4, etc. become high, and, as a result, the whole battery terminal member 1 can be made into a high intensity | strength thing.

  Further, the flat surface forming process, the projecting part forming process, the intermediate projecting part forming process, the recessed part forming process, and the base forming process can be processed by pressing with an upper mold, and each The processed member 11 that has completed the process can be transferred (transferred) in order with its processing surface up, and each process can be processed by lowering the upper die from above, enabling high-precision and high-speed continuous processing. It is.

  Moreover, since it is a high-speed continuous process, since a collective number can be manufactured in a short time, manufacturing cost can be reduced. In addition, the processing can be performed using a general-purpose press machine, which can reduce the manufacturing cost.

  In addition, since there is no portion that is removed from the processed member 11 that is the raw material until the peripheral portion 12a is removed in the base forming step, the material utilization rate is reduced by reducing the amount of the peripheral portion 12a that is cut in the base forming step. Can be very high. Since the material utilization rate is extremely increased in this way, the manufacturing cost can be reduced. On the other hand, in the manufacturing method shown in FIGS. 11 to 13 described above, it is not easy to increase the material utilization rate because it is necessary to cut off the portion of the insertion hole 104.

  Here, in order to reduce the amount of the peripheral portion 12a to be excised in the base forming step, each previous step is optimized. For example, the predetermined contour of the base portion 2 of the battery terminal member 1 as shown in FIG. 1 is approximately rectangular (approximately rectangular in plan view, including a rectangle or a track shape), and the protruding portion 4 is. When the base 2 is formed at a position deviating from the center in the long side direction, in the protrusion forming step, the upper mold K2 is formed with a hole K2a (with a shape corresponding to the protrusion 4 as shown in FIG. In FIG. 8 (a), this is indicated by a one-dot chain line) so as to be aligned with the position deviated from the center in the long side direction of the flat surface 11a, and the flat surface 11a is pressed by the upper mold K2.

  Then, after the protruding portion forming step, one side (the left side of the hole K2a in FIG. 8) is narrow and the other side (the right side of the hole K2a in FIG. 8) is widened on both sides of the formed protruding portion 4. It will be. Thereby, when the thin wall portion 12 is formed in the next intermediate protrusion forming step, it is suppressed that one side of the peripheral portion 12a of the thin wall portion 12 is large and the other is small, and as a result, it is an unnecessary portion. The total amount of the entire peripheral portion 12a can be reduced. Therefore, the amount of the peripheral portion 12a to be excised can be reduced.

  The battery terminal member manufacturing method according to the embodiment of the present invention includes a thin base 2 having a predetermined contour without the intermediate protrusion 3 as shown in FIG. 9, and a thickness direction from the base 2. It can also be applied to a battery terminal member 1 ″ provided with a projecting portion 4 projecting into the same. In that case, the intermediate protruding portion forming step is omitted, and the thin portion 12 is formed in the protruding portion forming step.

  As mentioned above, although the manufacturing method of the terminal member for batteries concerning the embodiment of the present invention was explained, the present invention is not restricted to what was indicated in the above-mentioned embodiment, and within the limits of the matter indicated in the claim. Various changes are possible. For example, if necessary, an additional step (for example, a step of adjusting the thickness of the thin portion 12 between the recess forming step and the base forming step) before and after each step of the method for manufacturing the battery terminal member is performed. It is also possible to provide additional processing in each step.

  The battery terminal member 1 can be variously modified. For example, in the case of a battery terminal member 1 ′ ″ in which a hole 2b as shown in FIG. It is also possible to provide an additional drilling step or the like in the method for manufacturing the battery terminal member according to the embodiment. Moreover, the recessed part 4a of the protrusion part 4 is abbreviate | omitted by the method of fixing to the other member of the battery terminal member 1, Therefore Therefore, a recessed part formation process is also omissible. Of course, the present invention can be applied even when the protruding portion 4 of the battery terminal member 1 is formed at the center position in the long side direction of the base portion 2. Further, between the intermediate protrusion 3 and the protrusion 4, one or more additional intermediate protrusions that are smaller than the outer diameter D of the intermediate protrusion 3 and larger than the outer diameter d of the protrusion 4 are provided. Is also possible.

DESCRIPTION OF SYMBOLS 1 Battery terminal member 2 Base part 3 Intermediate protrusion part 4 Protrusion part 10 Wire 11 Processing member 11a Flat surface 12 of processing member Thin wall part D Outer diameter of intermediate protrusion part d Outer diameter K1, K2, K3, K4, K5 Upper mold

Claims (5)

A thin base having a predetermined contour; an intermediate protrusion protruding from the base in the thickness direction; and a protrusion protruding from the end surface of the intermediate protrusion with an outer diameter smaller than the outer diameter of the intermediate protrusion; A battery terminal member manufacturing method comprising:
A machining member creating step of creating a cylindrical machining member by cutting a wire having a circular cross section;
A flat surface forming step of forming a flat surface on the cylindrical side surface of the processed member;
A protruding portion forming step of forming the protruding portion on the processed member on which the flat surface is formed;
An intermediate projecting portion forming step for forming the intermediate projecting portion and the thin portion on the processed member on which the projecting portion is formed;
A base forming step of cutting the peripheral portion of the thin portion to form the base so as to have the predetermined contour;
The manufacturing method of the terminal member for batteries characterized by including. A manufacturing method of a battery terminal member, comprising: a thin base portion having a predetermined contour; and a protrusion portion protruding in the thickness direction from the base portion,
A machining member creating step of creating a cylindrical machining member by cutting a wire having a circular cross section;
A flat surface forming step of forming a flat surface on the cylindrical side surface of the processed member;
A projecting portion forming step of forming the projecting portion and the thin portion on the processed member on which the flat surface is formed;
A base forming step of cutting the peripheral portion of the thin portion to form the base so as to have the predetermined contour;
The manufacturing method of the terminal member for batteries characterized by including. In the manufacturing method of the battery terminal member according to claim 1 or 2,
The battery terminal member has a recess formed on the end surface of the protrusion,
The manufacturing method of the terminal member for batteries characterized by further including the recessed part formation process of pressing the said process member with the protrusion part of an upper metal mold | die after the said protrusion part formation process, and forming the said recessed part. In the manufacturing method of the battery terminal member of any one of Claims 1-3,
A predetermined contour of the base portion is substantially rectangular, and the protruding portion is formed at a position deviating from the center of the long side direction of the base portion or at the center position. Production method. In the manufacturing method of the battery terminal member according to claim 4,
The protruding portion is formed at a position deviating from the center of the long side direction of the base portion,
In the projecting portion forming step, the upper mold in which the hole portion having a shape corresponding to the projecting portion is formed on the molding surface is aligned with the position where the hole portion is out of the center in the long side direction of the flat surface. A method for producing a battery terminal member, comprising arranging and pressing the flat surface with the upper mold.

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