JP2010198842A - Metal-pressed molding body and battery using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal-pressed molding body, capable of preventing welding errors at the time of welding the other member on the surface of a plane sheet and preventing assembling defects due to catching of assembled components, and to provide a battery which uses the metal-pressed molding body. <P>SOLUTION: The metal-pressed molding body 8 forming a burr 15 caused by press molding has a flat plate 10 and a recessed section 16 formed at the outer periphery of the flat plate 10. The burr 15 is formed at the outer periphery of a recessed section 16; a level difference 17 is formed between the surface 10a of the flat plate 10 and the bottom surface 16a of the recessed section 16; and the burr 15 is located in the level difference 17. The projection amount of the burr 15 from the surface of the plat plate 10 can be restrained in this structure, and welding defects at welding of the other member 13 on the surface of the flat plate 10 can be prevented, without adding a removing process for the burr 15. Furthermore, the possibility of a component being caught by the burr 15 at mounting of the component can be prevented, and accordingly, assembling defects can be also prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a metal press-formed body in which a flash is formed by press forming and a battery using the metal press-formed body as a terminal plate.

  In recent years, small and light electronic devices such as mobile phones and mobile devices have become widespread. As a battery used in these electronic devices, a rectangular sealed battery is known. FIG. 12 shows a perspective view of an example of a conventional sealed battery. The sealed battery 100 is obtained by sealing the opening of a bottomed cylindrical outer can 101 containing an electrode body (not shown) with a sealing body 102. A negative electrode terminal 103 and a sealing body 104 are attached to the sealing body 102. The sealing body 104 seals the electrolyte injection hole.

  13 is a cross-sectional view taken along line FF in FIG. Patent Document 1 below describes a sealing body having the same configuration as that of FIG. The sealing body 104 is formed by press-bonding an aluminum plate 105 formed of aluminum or an aluminum alloy and a nickel plate 106 formed of nickel or a nickel alloy. The aluminum plate 105 forms a convex portion 107, and the convex portion 107 is inserted into the liquid injection hole 108 of the sealing body 102.

  The sealing body 104 is joined to the sealing body 102 by welding the aluminum plate 105 to the sealing body 102. As a result, a welded portion 109 is formed on the entire circumference of the aluminum plate 105.

  In this configuration, the sealing body 104 can also be used as a positive terminal plate, and a lead having a nickel or nickel alloy layer can be welded to the nickel plate 106. In this case, the nickel plate 13 and the lead are the same type of metal and have good weldability.

  For the manufacture of the sealing body 104, a clad plate in which an aluminum layer and a nickel layer are joined vertically is used. A substantially square plate is punched from the clad plate. This plate is forged with a press machine and formed into the shape shown in FIG.

JP 2007-317577 A

  However, when the sealing body 104 is formed by the manufacturing method as described above, a flash projecting upward from the nickel plate 106 is formed on the outer periphery of the nickel plate 106.

  When a plate-like lead is resistance-welded to the nickel plate 106 with the flash formed on the nickel plate 106, the contact between the nickel plate 106 and the lead deteriorates due to the flash, and the current flow is unstable. And cause poor welding. In FIG. 12, when the resin cover is attached to the sealing body 102 side, the flash is caught on the resin cover, and the resin cover is displaced, which may cause assembly failure.

  The present invention solves the conventional problems as described above, and can prevent welding failure when other members are welded to the flat plate surface, and can also prevent assembly failure due to catching of assembly parts. An object is to provide a press-molded body and a battery using the same.

  In order to achieve the above object, a metal press-formed body of the present invention is a metal press-formed body in which a flash is formed by press forming, and includes a flat plate and a recess formed on an outer periphery of the flat plate, The flash is formed on the outer periphery of the concave portion, and a step is formed between a surface of the flat plate and a bottom surface of the concave portion, and the flash is in the step.

  The battery of the present invention is a battery using the metal press-formed body, wherein the metal press-formed body is used as a terminal plate for joining leads for electrical connection, A surface on the tip end side of the flash is used as a joint surface of the lead.

  ADVANTAGE OF THE INVENTION According to this invention, the welding failure at the time of welding another member to a flat plate surface can be prevented, and the assembly failure by the catch of an assembly part can also be prevented.

1 is a perspective view of a sealed battery according to an embodiment of the present invention. In FIG. 1, the principal part enlarged view which shows the state which plugged the liquid injection hole 5 with the sealing body 8. FIG. Sectional drawing in the AA line of FIG. Sectional drawing which shows the state which welded the sealing body 8 of FIG. 3 to the sealing body 3. FIG. (A) The figure is equivalent to the enlarged view of the B part of FIG. 4, and sectional drawing which shows the state which connected the lead | read | reed 13 to the nickel plate 10 of FIG. 4, (b) is an enlarged view of the C part of FIG. Figure. Sectional drawing which shows the comparative example of the structure of FIG. The perspective view which shows the state before press molding of the sealing body which concerns on one embodiment of this invention. Sectional drawing which shows the state which mounted the clad body 20 shown in FIG. Sectional drawing which shows the state which compression of the clad body 20 by the press molding machine 21 was completed. The enlarged view of the E section of FIG. Sectional drawing at the time of replacing the knockout 24 in FIG. 10 with the knockout 30 which concerns on a comparative example. The perspective view of an example of the conventional sealed battery. Sectional drawing in the FF line | wire of FIG.

  According to the metal press-formed body of the present invention, since the flash formed on the flat plate by press forming is in the step, the projection amount of the flash from the flat plate surface can be suppressed. For this reason, the welding defect at the time of welding another member to the flat plate surface can be prevented, without adding the flash removal process. In addition, when the assembly part is attached, the flash can be prevented from being caught on the part, and assembly failure can be prevented.

  According to the battery of the present invention, since the metal press-formed body of the present invention is used for the terminal plate for joining the lead for electrical connection, welding failure when welding the lead to the terminal plate can be prevented, It is possible to prevent an assembly failure when the assembly component is attached to the sealing body.

  In the metal press-formed body of the present invention, it is preferable that the tip of the flash is in the step over the entire outer periphery of the recess. According to this structure, it becomes advantageous by the prevention of the above-mentioned welding failure and assembly failure prevention.

  Moreover, it is preferable that the said recessed part is for suppressing the protrusion amount from the surface of the said flat plate of the said burr | flash.

  Moreover, it is preferable that the surface of the said flat plate is a welding surface.

  In the battery of the present invention, the battery is a sealed battery in which an opening of an outer can is sealed with a sealing body, a sealing body is inserted into a hole formed in the sealing body, and the sealing body is It is preferable that the sealing body is also welded to the sealing body.

  Further, the sealing body is a laminated plate in which a plurality of metal plates are stacked, and it is preferable that the metal plate joined to the lead and the metal plate welded to the sealing body are different materials. According to this structure, the metal plate which joins a lead can be made into the same kind metal as the metal plate which forms a lead, and the weldability of a lead and a sealing body becomes favorable.

  Note that in this embodiment, the same kind of metal is a metal material having the same main component element.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The sealed battery according to the following embodiment is, for example, a rectangular lithium ion battery, and is used for a mobile phone, a mobile device, or the like.

  The present embodiment relates to the structure of a sealing plate (terminal plate) of a sealed battery. First, referring to FIGS. 1 to 4, an outline of a process from the most recent state of sealing the liquid injection hole to sealing the liquid injection hole with a sealing body will be described.

  FIG. 1 shows a perspective view of a sealed battery 1 according to an embodiment of the present invention. In FIG. 1, the outer can 2 is a bottomed cylindrical body having a substantially rectangular opening formed at the upper end. The outer can 2 is formed, for example, by deep drawing a thin plate of aluminum or aluminum alloy. An electrode body is built in the outer can 2.

  In the state of FIG. 1, the opening of the outer can 2 is closed by the sealing body 3. More specifically, the seam portion 4 of the outer can 2 and the sealing body 3 is seam welded over the entire circumference. The sealing body 3 is connected to a positive electrode current collecting lead (not shown) on the back surface, and the sealing body 3 is charged to a positive electrode potential.

  The sealing body 3 is a horizontally long member obtained by press-molding a thin plate of aluminum or an aluminum alloy, for example. A liquid injection hole 5 for injecting the electrolytic solution into the outer can 2 is formed in the sealing body 3.

  A negative electrode terminal 7 is attached to the sealing body 3 via an insulator 6. The negative electrode terminal 7 is connected to a negative electrode current collecting lead (not shown) via a lead body (not shown) on the back surface of the sealing body 3. As a result, the negative terminal 7 is charged to a negative potential.

  After the sealing body 3 is welded to the outer can 2, an electrolytic solution is injected into the outer can 2 from the liquid injection hole 5. Thereafter, the injection hole 5 is closed with a sealing body 8 which is a metal press-molded body.

  The sealing body 8 is formed by press-bonding an aluminum plate 9 formed of aluminum or an aluminum alloy and a nickel plate 10 formed of nickel or a nickel alloy. A convex portion 11 is integrated with the aluminum plate 9.

  The sealing body 8 is produced as follows, for example. First, in a state where a plate material made of aluminum or an aluminum alloy and a plate material made of nickel or a nickel alloy are vertically aligned, they are pressure-bonded to each other by hot rolling or forging. This makes it possible to produce a clad plate in which an aluminum layer and a nickel layer are joined vertically.

  Next, a substantially rectangular plate is punched from the clad plate. The convex portion 11 is formed by forging the plate with a press molding machine. In addition, as shown in FIG. 1, the peripheral portion of the aluminum plate 9 is protruded outward from the peripheral portion of the nickel plate 10. Thereby, the sealing body 8 is produced. The forging by the press machine will be described in detail later.

  FIG. 2 is an enlarged view of a main part showing a state in which the liquid injection hole 5 is closed with the sealing body 8. FIG. 3 shows a cross-sectional view taken along line AA in FIG. As shown in FIG. 3, the convex portion 11 is inserted into the liquid injection hole 5, and the aluminum plate 9 is in contact with the surface of the sealing body 3.

  FIG. 4 is a cross-sectional view showing a state in which the sealing body 8 is welded to the sealing body 3. A weld 12 is formed on the entire circumference of the aluminum plate 9. That is, the sealing body 8 is joined to the sealing body 3 by welding the outer peripheral portion of the aluminum plate 9 to the sealing body 3. For this welding, for example, laser welding is used.

  As shown in FIG. 4, the peripheral portion of the aluminum plate 9 protrudes outward from the peripheral portion of the nickel plate 10. According to this configuration, only the peripheral portion of the aluminum plate 9 can be easily welded to the sealing body 3. This can prevent the nickel plate 10 from melting together with the aluminum plate 9 during welding.

  In the state of FIG. 4, the sealing body 8 which is a metal press-molded body is electrically connected to the sealing body 3 charged to the positive electrode potential. For this reason, the sealing body 8 can be used also as a positive electrode terminal board.

  As described above, both the sealing body 3 and the aluminum plate 9 are made of the same metal of aluminum or aluminum alloy. For this reason, the weldability of both members is good. When the nickel plate 10 is used as a positive terminal plate, a plate-like lead is welded to the nickel plate 10 for connection to a protective circuit board or the like.

  The lead usually has a layer of nickel or nickel alloy. Therefore, the nickel plate 10 and the lead are the same type of metal and have good weldability. That is, the reason why the sealing body 8 has a two-layer structure is to improve the weldability with the lead when the sealing body 8 is also used as the positive electrode terminal plate.

  The nickel plate 10 may be replaced with a metal plate other than nickel, and examples of the material of such a metal plate include stainless steel or copper. One or more metal layers may be disposed between the aluminum plate 9 and the nickel plate 10.

  FIG. 5A corresponds to an enlarged view of a portion B in FIG. 4, and shows a state in which leads 13 for electrical connection are connected to the nickel plate 10 in FIG. That is, in this configuration, the sealing body 8 is used as a terminal board.

  As above-mentioned, the sealing body 8 press-molds the clad board which joined the metal layer up and down. Although details will be described later, a flash 15 is formed on the outer periphery of the nickel plate 10 during press forming.

  FIG.5 (b) has shown the enlarged view of the C section of Fig.5 (a). The nickel plate 10 has a recess 16 formed in the periphery. The flash 15 is formed on the outer periphery of the recess 16. A step 17 is formed between the surface 10 a of the nickel plate 10 and the bottom surface 16 a of the recess 16. The flash 15 is in the step 17.

  FIG. 6 is a cross-sectional view showing a comparative example. The nickel plate 18 in FIG. 6 does not have the concave portion 16 like the nickel plate 10 in FIG. 5A, and the flash 15 is formed to protrude on the surface 18 a of the nickel plate 18.

  In this case, as shown in FIG. 5A, when the lead 13 is connected to the surface 18a of the nickel plate 18, a gap is formed between the surface 18a of the nickel plate 18 and the lead 13, as shown in FIG. The adhesion between the two becomes poor. If the lead 13 is to be resistance-welded to the nickel plate 18 in this state, the current flow becomes unstable and causes welding failure. Further, when the resin cover that covers the sealing body 3 is attached, the flash 15 is caught by the resin cover, and the resin cover is displaced, which causes an assembly failure.

  In the nickel plate 18 of FIG. 6, in order to remove the flash 15, it is necessary to add a pressing process for crushing the flash 15. Further, the burr 15 can be removed by barrel polishing, but the addition of a process does not change, and the surface may be rough and adversely affect welding.

  In the present embodiment, as shown in FIG. 5B, the flash 15 is in the step 17, so the tip of the flash 15 is below the surface 10 a of the nickel plate 10. For this reason, the adhesiveness between the lead 13 and the surface 18a of the nickel plate 18 is improved, and the weldability of both is also improved.

  Further, since the flash 15 does not protrude from the surface 10a of the nickel plate 10, it is possible to prevent the assembly parts from being caught. That is, according to the sealing body 8 according to the present embodiment, it is possible to prevent the above-described welding failure or assembly failure without adding the step of removing the flash 15.

  Next, the sealing body 8 according to the present embodiment will be described more specifically while explaining the manufacturing method. FIG. 7 is a perspective view showing a state before the press molding of the sealing body 8 shown in FIG. The sealing body 8 shown in FIG. 1 is obtained by press-molding the clad body 20 shown in FIG. As described above, the clad body 20 is formed by punching out a clad plate in which an aluminum layer and a nickel layer are joined in a vertical direction.

  In the clad body 20, an aluminum plate 9 'and a nickel plate 10' are joined. The aluminum plate 9 'corresponds to the aluminum plate 9 shown in FIGS. 1-5, and the protruding portions 11 shown in FIGS. 1, 3 and 4 are formed by press molding. The nickel plate 10 'corresponds to the nickel plate 10 shown in FIGS. 1-5, and the flash 15 and the recess 16 shown in FIG. 5B are formed by press molding.

  FIG. 8 is a cross-sectional view showing a state in which the clad body 20 shown in FIG. 7 is placed on the press molding machine 21. The press molding machine 21 includes a punch 22 that is an upper die, a die 23 that is a lower die, and a knockout 24 disposed in the die 23. The punch 22 forms a hole 25, the die 23 forms a groove 26, and the knockout 24 forms a convex portion 27.

  From the state of FIG. 8, the punch 22 is lowered (in the direction of arrow a), and the clad body 20 is compressed and plastically deformed. FIG. 9 is a cross-sectional view showing a state where the compression of the clad body 20 by the press molding machine 21 is completed.

  In FIG. 8, a part of the aluminum plate 9 ′ enters the hole 25 of the punch 22 and forms a protruding portion 11 as shown in FIG. 9. Further, the aluminum plate 9 ′ enters a space sandwiched between the punch 22 and the groove 26 of the die 23, thereby forming the aluminum plate 9 wider than the nickel plate 10.

  As described above, the clad body 20 is compressed by the punch 22 from above and pushed up by the knockout 24 from below. A convex portion 27 is formed on the knockout 24, and a concave portion is formed on the nickel plate 10 by the compression by the convex portion 27. This will be specifically described with reference to FIG.

  FIG. 10 is an enlarged view of a portion E in FIG. A concave portion 28 is formed inside the convex portion 27 formed in the knockout 24. Due to the compression by the knockout 24, the nickel plate 10 enters the concave portion 28 of the knockout 24 and forms the concave portion 16 at a portion corresponding to the convex portion 27 of the knockout 24.

  Here, a gap 29 is formed between the outer periphery of the knockout 24 and the inner periphery of the die 23 so that the knockout 24 can move. The gap 29 is slightly sized, but when the knockout 24 pushes up the clad body 20, the end face portion of the nickel plate 10 enters the gap 29. As a result, the flash 15 is formed on the nickel plate 10.

  However, when the knockout 24 having the convex portion 27 is used as shown in FIG. 10, the flash 15 can be accommodated in the step 17, and the tip of the flash 15 does not protrude from the surface 10 a of the nickel plate 10. It becomes possible to do so. As a result, poor welding and poor assembly can be prevented as described above.

  FIG. 11 is a cross-sectional view when the knockout 24 in FIG. 10 is replaced with a knockout 30 according to a comparative example. At the tip of the knockout 30, the convex portion 27 like the knockout 24 of FIG. 9 is not formed.

  The end face portion of the nickel plate 10 enters the gap 29 and the flash 15 is formed in the gap 29 as in the case of the configuration of FIG. Since the convex portion is not formed in the knockout 30 of FIG. 10, the concave portion is not formed at the end portion of the nickel plate 10. Therefore, the flash 15 protrudes directly from the surface 10a of the nickel plate 10 and causes welding failure and assembly failure as described with reference to FIG.

  Next, experimental results will be described. In order to confirm the effect of the present embodiment, a comparative experiment was performed. In the embodiment, the sealing body 8 is welded to the sealing body 3 as shown in FIG. The edge part of the nickel plate 10 which concerns on an Example is a structure where the flash | flash 15 does not protrude from the surface 10a of the nickel plate 10 like Fig.5 (a), (b).

  In the comparative example, the nickel plate 10 of the example is replaced with the nickel plate 18 shown in FIG. That is, the nickel plate 18 according to the comparative example has a structure in which the flash 15 protrudes from the surface 10 a of the nickel plate 10.

  In the experiment, nickel-made leads (width: 3 mm) were resistance-welded to the surfaces of the nickel plates of Examples and Comparative Examples (10 pieces each), and the welding strength (N) was measured. The welding strength is a force when the lead is peeled off from the nickel plate. The thickness of the nickel plate of the example and the comparative example was 0.2 mm, and the thickness of the lead was three types of 0.1 mm, 0.15 mm, and 0.2 mm.

  MIRO-3002 made by Microelectronics was used as the welding machine, the electrode was made of alumina-dispersed copper (diameter 1.3 mm), the welding locations were two places with a pitch of 4.2 mm, and the applied pressure was 14.7 N.

  The experimental results are shown in Table 1 below.

  According to the experimental results of Table 1, the average value of the welding strength is higher in the example than in the comparative example regardless of the lead thickness. The difference in welding strength between the example and the comparative example increases as the lead thickness increases. When the lead thickness is 0.2 mm, the difference in welding strength is significant.

  The reason why the difference in welding strength is small when the lead thickness is small is considered to be that the lead is easily deformed by the pressure applied during welding, and the decrease in adhesion between the lead and the nickel plate is small.

  On the other hand, as the lead thickness increases, the lead is less likely to be deformed. In this case, if the flash 15 protrudes as in the comparative example of FIG. 6, the degree of floating of the lead 13 from the nickel plate 18 also increases.

  As described above, when the degree of floating of the lead 13 is large, the lead 13 is in contact with the nickel plate 18 in the portion where the flash 15 is formed. Adhesion with the plate 18 becomes insufficient. In this state, it is considered that the contact resistance increases, a current is shunted to the portion where the flash 15 is formed, the loss of welding energy increases, and the welding strength also decreases.

  In the example of FIG. 5, an example in which the entire flash 15 is in the step 17 is shown, but a configuration in which a part of the flash 15 protrudes from the step 17 may be used.

  In this case, the tip of the flash 15 is above the surface 10 a of the nickel plate 10. However, the flash 15 protrudes from the bottom surface 16 a of the recess 16. For this reason, the height from the surface 10a of the nickel plate 10 at the tip of the flash 15 is lower than when the flash 15 having the same shape is formed on the surface 10a of the nickel plate 10 as shown in FIG.

  Therefore, even if there is a part where the tip of the flash 15 partially protrudes from the surface 10 a of the nickel plate 10 on the outer periphery of the nickel plate 10, the amount of protrusion is suppressed by the step 17 formed by the recess 16. Become. Even if the protruding flash 15 and the lead 13 come into contact with each other, since the recess 16 exists, the flash 15 can be deformed and escape. For this reason, even if a part of the flash 15 protrudes from the step 17, the protrusion of the flash 15 only needs to be suppressed to such an extent that a welding failure or an assembly failure can be prevented.

  Further, in the present embodiment, the example in which the metal press-molded body is used as a sealed body for a sealed battery has been described, but the use of the metal press-molded body according to the present embodiment is not limited to this. . For example, the metal press-formed body according to the present embodiment may be used for the negative electrode terminal 7 shown in FIGS. When used as a battery terminal plate, the battery may be not only a square battery as in the present embodiment, but also a coin-type battery or a cylindrical battery.

  Moreover, you may use the metal press molding which concerns on this Embodiment for products other than a battery. As described above, the metal press-formed body according to the present embodiment suppresses the protrusion of the flash from the flat plate surface. For this reason, if it is the structure which welds a member to the flat plate part of a metal press molded object, a welding failure can be prevented and an assembly failure can also be prevented collectively. Therefore, the metal press-molded body according to the present embodiment can be used for various products having a configuration in which a member is welded to a flat plate portion.

  As described above, according to the present invention, it is possible to prevent welding failure when other members are welded to the flat plate surface, and it is possible to prevent assembly failure due to catching of assembly parts. It is useful as a terminal board for sealed batteries used in telephones and mobile devices.

DESCRIPTION OF SYMBOLS 1 Sealed battery 2 Exterior can 3 Sealing body 5 Injection hole 8 Sealed body (metal press-molded body)
9 Aluminum plate 10 Nickel plate (flat plate)
10a Nickel plate surface 13 Lead 15 Beam 16 Recess 16a Bottom of recess 17 Step

Claims (7)

A metal press-formed body in which a flash is formed by press molding,
A flat plate and a recess formed on the outer periphery of the flat plate,
The flash is formed on the outer periphery of the recess,
A step is formed between the surface of the flat plate and the bottom surface of the recess,
A metal press-formed body, wherein the flash is in the step.   The metal press-formed product according to claim 1, wherein a tip of the flash is in the step over the entire outer periphery of the recess.   The metal press-formed body according to claim 1 or 2, wherein the concave portion is used for suppressing a protruding amount of the flash from the surface of the flat plate.   The metal press-formed body according to any one of claims 1 to 3, wherein a surface of the flat plate is a welded surface. A battery using the metal press-formed product according to any one of claims 1 to 4,
The metal press-formed body is used for a terminal plate for joining leads for electrical connection,
A battery characterized in that a surface on a tip end side of the flash among both surfaces of the flat plate is used as a joint surface of the lead. The battery is a sealed battery in which an opening of an outer can is sealed with a sealing body,
A sealing body is inserted into the hole formed in the sealing body,
The sealing body also serves as the terminal board,
The battery according to claim 5, wherein the sealing body is welded to the sealing body.   The battery according to claim 6, wherein the sealing body is a laminated plate in which a plurality of metal plates are stacked, and the metal plate joined to the lead and the metal plate welded to the sealing body are different materials.

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