JP5125094B2 - Sealed battery manufacturing method and manufacturing apparatus thereof - Google Patents

Description

  The present invention relates to a sealing plate and lead in a sealed battery in an alkaline storage battery such as a nickel metal hydride battery, a lead and a positive electrode current collector, an electrode group and a positive electrode current collector or a negative electrode current collector, a negative electrode current collector and a battery case. The present invention relates to a method for manufacturing a sealed battery using a resistance welding electrode rod applied to connection and an improvement of the manufacturing apparatus.

  Alkaline storage batteries represented by nickel-cadmium storage batteries and nickel-metal hydride storage batteries are widely used in various applications such as mobile phones and laptop computers because they are reliable and easy to maintain. In recent years, there has been a demand for the development of an alkaline storage battery suitable for large current discharge as a power source for power tools, power-assisted bicycles and electric vehicles.

  As shown in FIG. 7, the alkaline storage battery is spirally wound through a separator 36 between a strip-like positive electrode plate 31 and a negative electrode plate 32 to form an electrode group 35, and a metal together with an electrolyte (not shown). The battery case 39 is housed and the opening of the battery case 39 is sealed with a sealing body 41.

  Such a large-current alkaline storage battery has a battery case in which a group of electrodes 35 in which a strip-shaped positive electrode plate 31 and a negative electrode plate 32 are wound in a spiral shape with an isolation separator 36 interposed therebetween. 39. In addition, as an input / output current collecting structure from the electrode group 35 suitable for a large current, a rectangular positive electrode current collecting one by one at the tip portion of the electrode plate protruding outward from the upper and lower end surfaces of the electrode group 35, respectively. The body 37 and the negative electrode current collector 38 are welded at a plurality of locations, and the battery case 39 and the negative electrode current collector 38 are welded to the center bottom portion of the battery case 39. Then, the positive electrode current collector 37 and the sealing body 41 are connected by the positive electrode lead 40, and the battery case 39 is sealed with the sealing body 41.

  As a manufacturing method for connecting the positive electrode lead 40 and the positive electrode current collector 37, the electrode group 35 and the positive electrode current collector 37 and the negative electrode current collector 38, the negative electrode current collector 38 and the battery case 39, and the positive electrode lead 40 and the sealing body 41, A manufacturing method in which direct welding is performed by applying a current between two resistance welding electrode rods by superimposing a material to be welded between the two resistance welding electrode rods and a pair of resistance welding electrode rods in parallel. In general, a series resistance welding manufacturing method in which a current is passed between resistance welding electrode rods from the surface of a workpiece to be welded arranged on top of each other and resistance welding is performed. The electrode rod for resistance welding is fastened to an electrode rod holder and can be pressurized by a pressure head. The electrode rod holder is made of a highly conductive material like the electrode rod for resistance welding.

When resistance welding is performed on ordinary materials, copper or copper alloys with high conductivity are used as the material for resistance welding electrode rods. However, resistance welding electrode rods using copper are used for resistance welding. Since the surface of the electrode rod is easily oxidized and the contact resistance with the electrode rod holder is increased, there is a problem that the welding strength is reduced due to variations in welding current. In the case of welding battery components, it is necessary to use an electrochemically stable material that does not elute into the electrolyte even when spatter is mixed. Specifically, as shown in FIG. 8, the resistance welding electrode rod 45 and the resistance welding electrode rod 46 used when welding the joint portion 50 between the current collector 47 and the current collector 48 sandwiching the battery case 49. There has been proposed a method of adopting a material such as molybdenum for spot welding using the material (for example, see Patent Document 1).
JP 2003-031203 A

  However, in the prior art disclosed in Patent Document 1 described above, the material of the resistance welding electrode rods 45 and 46 is changed from copper or a copper alloy to molybdenum or the like as shown in FIG. Although the fear of short circuit is eliminated, the heat generated during welding tends to be high. When spot welding is performed point by point as in Patent Document 1, the effect of heat propagation is not an issue. However, when continuous production is performed, heat generation becomes significant, and when the amount of heat generation exceeds a certain level, the above-described resistance welding is performed. Since the electrode rods 45 and 46 adhere to the current collectors 47 and 48, which are the materials to be welded, welding cannot be performed, productivity is lowered, and the welded materials welded by the adhesion are peeled off, so that the welding quality is improved. There was a problem to be reduced.

  Also, in the resistance welding electrode rods 45 and 46 made of molybdenum, the surface of the resistance welding electrode rods 45 and 46 is oxidized in the same manner as the copper resistance welding electrode rods 45 and 46, so that the current value is reduced. It is difficult to reduce the decrease and the variation in the welding state. Furthermore, molybdenum is an expensive material, and there is a problem that the cost increases compared to a commonly used electrode rod made of chromium copper or copper alloy.

  The present invention has been made in view of the above-described problems. The resistance welding electrode rod having an alkali-resistant plating applied to the surface excluding the tip end face portion of the resistance welding electrode rod is subjected to resistance welding to perform resistance welding. It is a method for producing a stable alkaline storage battery such as a nickel metal hydride storage battery that eliminates concerns such as a short circuit inside the sealed battery by connecting the components, and avoids problems during welding and deterioration of quality. It is an object of the present invention to provide a manufacturing method and a manufacturing apparatus for a sealed battery that are inexpensive by plating the surface of a resistance welding electrode rod without introducing new equipment.

  In order to solve the above problems, the present invention provides a sealing plate, a lead, a current collector, an electrode group, and battery case components in a sealed battery using resistance welding electrode bars, and the sealing plate and the lead. , A lead and positive electrode current collector, an electrode group and a positive electrode current collector or a negative electrode current collector, and a sealed battery manufacturing method for resistance welding the negative electrode current collector and a battery case. It is characterized in that a resistance welding electrode bar, which has been subjected to alkali resistance plating, is pressed against the surface excluding the tip end face portion of the metal plate and resistance welding is performed for connection.

  According to the present invention, spattering is suppressed by pressing a resistance welding electrode rod, which has been plated with alkali resistance, on the surface of the component excluding the tip end face portion of the resistance welding electrode rod, and resistance welding to connect the components. Therefore, the sealed battery can be stably supplied with improved quality by suppressing internal short circuit inside the sealed battery. In addition, by applying alkali-resistant plating, it is possible to prevent the formation of an oxide film on the surface of the electrode rod for resistance welding, so that the current value to be energized during welding can be stabilized and welding strength can be secured. Become.

In the first aspect of the present invention, the sealing plate, the lead, the current collector, the electrode group, and the constituent parts of the battery case in the sealed battery are sealed with the electrode rod for resistance welding, the sealing plate and the lead, the lead and the positive electrode. A method of manufacturing a sealed battery in which a current collector, an electrode group and a positive electrode current collector or a negative electrode current collector, and a negative electrode current collector and a battery case are resistance-welded. The resistance welding electrode rod is pressed from the surface of the resistance welding electrode rod during welding, and the resistance welding electrode rod, which has been plated with alkali resistance on the surface excluding, is connected by resistance welding. Even if the plating applied to the surface is mixed, it is difficult to be dissolved by the alkaline electrolyte, and a short circuit between the positive electrode plate and the negative electrode plate can be suppressed.

  In the second invention of the present invention, when nickel is mixed as a spatter in the battery case by applying plating made of electroless nickel or electrolytic nickel as the alkali-resistant plating applied to the resistance welding electrode rod However, in alkaline electrolyte, even if it dissolves depending on the alkali concentration and potential, it does not precipitate, and it is possible to suppress a short circuit between the positive electrode plate and the negative electrode plate.

  According to a third aspect of the present invention, there is provided a sealed battery manufacturing apparatus for resistance-welding components to be electrically connected in a sealed battery, wherein the components are placed on the base, and the components are resistance-welded by energization. Resistance welding electrode rods with electroless nickel plating or electrolytic nickel plating on the surface excluding the tip end face of the resistance welding electrode rod, an electrode rod holder for holding the resistance welding electrode rod, and an electrode rod for resistance welding. It consists of a pressure drive unit that loads the pressure force, a pressure follow-up unit that transmits the pressure force of the pressure drive unit to the electrode rod holder, and a welding power source unit that energizes the electrode rod for resistance welding. When the surface of the resistance welding electrode rod is prevented from being mixed with the electrode of the resistance welding electrode by plating the surface of the resistance welding electrode rod, the nickel plating applied to the surface of the resistance welding electrode rod as a spatter is mixed in the battery case Can have, in an alkaline electrolyte solution without precipitates be dissolved in a alkali concentration and potential, it is possible to suppress a short circuit of the positive electrode plate and the negative electrode plate.

  In the fourth invention of the present invention, the resistance welding electrode rod is made of a material made of chrome copper or a copper alloy, so that the nickel plating has good adhesion and can be manufactured at low cost, and the tip of the resistance welding electrode rod. It becomes possible to reuse by polishing the end face.

  In the fifth aspect of the present invention, since the cross-sectional shape of the electrode rod for resistance welding is round or square, no complicated shape is used. The tip end surface of the electrode rod can be easily polished to facilitate reuse.

  In the sixth aspect of the present invention, when the electrode rod holder for holding the resistance welding electrode rod is made of a material made of copper or a copper alloy, when supplying current from the electrode rod holder to the resistance welding electrode rod, The electrode rod holder itself can stably supply current without generating heat.

  In the seventh invention of the present invention, the entire surface of the electrode rod holder holding the resistance welding electrode rod or the portion where the resistance welding electrode rod contacts is subjected to electroless nickel plating or electrolytic nickel plating. Since no oxidation occurs on the contact surface between the holder and the electrode rod for resistance welding, the contact state between the electrode rod for resistance welding and the electrode rod holder can be electrically stabilized, and welding can be performed with a stable welding current. Thus, it is possible to prevent a decrease in welding strength and to prevent the copper fine powder from falling off from the electrode rod holder when the resistance welding electrode rod is fastened.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings with reference to FIGS. In the cylindrical battery, which is the sealed battery of the present invention shown in the schematic cross-sectional view of FIG. 2, a felt-like or sponge-like metal porous body is used as a base material, and an active material is directly applied to the voids of this base material. An electrode group 5 formed by spirally winding a belt-like positive electrode plate 1 and a negative electrode plate 2 with a separator 6 interposed therebetween is housed in a bottomed cylindrical metal battery case 9. Has been. As an input / output current collecting structure from the positive electrode plate 1 and the negative electrode plate 2 suitable for large current discharge, the end 3 of the positive electrode 1 protrudes above the electrode group 5 and the end 4 of the negative electrode 2 is the electrode group 5. The electrode group 5 is configured to protrude downward.

In this structure, the positive electrode plate 1 or the negative electrode plate 2 has a tabless method (leadless method) without lead pieces connecting the current collectors, and the positive electrode current collector 7 is welded to the end portion 3 of the positive electrode plate 1 at a plurality of locations. Then, one end of the positive electrode lead 10 is resistance welded to the positive electrode current collector 7, and the other end of the positive electrode lead 10 is resistance welded to the sealing body 11 having a cap 13 that also serves as a positive electrode terminal with a built-in safety valve 12. doing. Further, the negative electrode current collector 8 is resistance-welded to the end 4 of the negative electrode plate 2, and a tongue-shaped negative electrode current collector piece (not shown) of the negative electrode current collector 8 is resistance-welded to the bottom surface of the battery case 9. ing. Thereafter, the opening of the battery case 9 is sealed by the sealing body 11.

  In producing the above sealed battery, the connection between the positive electrode current collector 7 and the end 3 of the positive electrode plate 1 will be described in detail as an example. FIG. 1 shows an example of a resistance welding portion using a resistance welding electrode rod 14 of a sealed battery manufacturing apparatus according to the present invention, and presses a pair of electrode rod holders 16 to which the resistance welding electrode rod 14 is fastened. The follower 18 is fixed in parallel.

  The pressure follower 18 is moved downward by the pressure driver 19 and can apply pressure to the electrode group 5 installed on the pedestal 22, and a pair of resistance welding electrode rods via the electrode rod holder 16. 14, a current is supplied from the welding power source 21, and the positive electrode current collector 7 connected to the positive electrode lead 10 is welded to the electrode group 5.

  3 shows a positive electrode current collector 7 in which the positive electrode lead 10 is previously welded to the pair of positive polarity resistance welding electrode rod 14a and negative polarity resistance welding electrode rod 14b in the welded portion shown in FIG. It is the expansion schematic diagram showing the state by which the edge part 3 of the positive electrode plate 1 of the electrode group 5 was welded to. The electrode group 5 is wound in a spiral shape with the positive electrode plate 1, the negative electrode plate 2, and the separator 6 interposed therebetween, and a negative electrode current collector 8 is welded to the lower end face.

  Further, the negative polarity resistance welding electrode rod 14b is provided with a nickel plating layer 15 on the surface of the negative polarity resistance welding electrode rod 14b, and the positive polarity resistance welding electrode rod 14a is similarly applied to the positive polarity side. The resistance welding electrode rod 14a is nickel-plated. The nickel plating layer 15 has a thickness of 3 μm to 5 μm, and the plating is preferably electroless nickel or electrolytic nickel.

  FIG. 4A is a schematic diagram in which the resistance welding electrode rod 14 is fastened to the electrode rod holder 16 also serving as a power feeding path by a fastening bolt 17, and FIG. 4B is a rectangular resistance welding electrode rod 14. FIG. 4C is a schematic view in which a round resistance welding electrode rod 14 is fastened. The shape of the electrode rod 14 for resistance welding is a simple shape, has excellent retainability with the electrode rod holder 16, and can easily be reused by easily polishing the end face portion of the electrode rod 14 for resistance welding. In the embodiment of the present application, the rectangular resistance welding electrode rod 14 shown in FIG. 4B is used.

  FIG. 5A is a partial perspective view of a resistance welding portion in the manufacturing apparatus of the present invention, and welding is performed using a pair of resistance welding electrode rods 14 having a nickel plating layer 15 applied thereto. The resistance welding electrode rod 14a on the polarity side is energized with a positive polarity, and the resistance welding electrode rod 14b on the minus polarity side is energized with a minus polarity. Further, as an example, the positive electrode current collector 7 to which the positive electrode lead 10 is welded in advance is connected to the electrode group 5. FIG. 5 (b) is a schematic diagram showing a place where the resistance welding electrode rod 14 is in pressure contact during resistance welding, and the resistance welding electrode 20a, 20b, 20c, 20d is connected to the resistance welding electrode on the positive polarity side. The rod 14a and the electrode rod 14b for resistance welding on the negative polarity side are pressed and welded.

  The positive electrode current collector 7 is connected to the current collector welds 20a, 20b, 20c, and 20d by two resistance welding electrode rods 14a on the positive polarity side and the resistance welding electrode rod 14b on the negative polarity side that are pressed in parallel. Resistance welding is performed by passing an electric current. The positive polarity resistance welding electrode rod 14a and the negative polarity resistance welding electrode rod 14b are fastened to the electrode rod holder 16 also serving as a power feeding path shown in FIG. It has a structure.

  Further, a pair of electrode rod holders 16 to which a resistance welding electrode rod 14a on the positive polarity side and a resistance welding electrode rod 14b on the negative polarity side are fastened are fixed in parallel to the pressure following portion 18 and the pressure following portion 18 is After moving downward by the pressure drive unit 19 and applying pressure to the electrode group 5, a current is passed from the resistance welding power source unit 21 to the pair of resistance welding electrode rods 14 via the electrode rod holder 16, so that the positive electrode lead 10 is moved. The positive electrode current collector 7 welded in advance is welded to the electrode group 5.

  Below, it demonstrates, referring drawings of the sealed battery in the Example of this invention. However, it is needless to say that the present invention is not limited to only the present embodiment. For example, the present invention can be applied to welding of lithium secondary batteries, and a resistance welding electrode rod plated with direct resistance welding is also developed. Is possible.

  As shown in FIG. 2, an end portion 3 of a strip-like positive electrode plate 1 made of sintered nickel having a thickness of 1.0 mm containing a positive electrode active material inside protrudes 1.50 mm upward from the negative electrode plate 2, and the negative electrode therein The end 4 of the strip-shaped negative electrode plate 2 made of iron punched metal plated with nickel having a thickness of 0.7 mm containing the active material protrudes downward from the positive electrode plate 1.50 mm and passes through the separator 6 to form a spiral. The electrode group 5 wound in a shape was formed.

  A positive electrode current collector 7 made of low carbon steel having a thickness of 0.40 mm, in which a positive electrode lead 10 is pre-welded to the end portion 3 of the positive electrode plate 1 in the upper direction of the electrode group 5, is electrolessly nickel-plated on the entire surface. 3 is connected by series resistance welding with a resistance welding electrode rod 14 made of chrome copper having a thickness of 5 .mu.m of the electroless nickel plating plating layer 15 shown in FIG. 3 held by an electrode rod holder made of chromium copper. The electrode group 5 to which the positive electrode current collector 7 was welded was designated as Example 1.

(Comparative Example 1)
In order to compare with Example 1, the electrode which welded the positive electrode collector which used the electrode rod for resistance welding of the chromium copper which does not give nickel plating on the surface similarly to Example 1, and the positive electrode lead was welded beforehand. The group was designated as Comparative Example 1.

(Comparative Example 2)
Comparative Example 2 was an electrode group using a resistance welding electrode bar made of molybdenum and not plated with nickel and welding a positive electrode current collector in which a positive electrode lead was previously welded in the same manner as in Example 1.

  After the resistance welding electrode rods used in Example 1, Comparative Example 1 and Comparative Example 2 were left in the atmosphere for 3 days, the electrode group and the positive electrode lead were previously welded with the resistance welding electrode rods. The number of electrode attachments that verified the number of times the electrode rod for resistance welding adhered to the positive electrode current collector when the positive electrode current collector was continuously welded for 500 shots, the presence or absence of spatter generated during welding, the welding strength and resistance at the weld Comparison was made based on the surface temperature of the electrode rod for welding, the current value of the electrode rod for resistance welding, and the like. In the measurement of welding strength, the positive electrode current collector was pulled with a tensile tester, and the load when peeled off from the electrode group was measured.

（表１）に示されるように電極付着回数の違いが明らかになった。実施例１および比較例１においては、図５（ｂ）に示す集電体溶接箇所２０ａから２０ｄの４箇所のシリーズ溶接において、５００ショットの連続溶接の中で抵抗溶接用電極棒が正極集電体７に付着するという不具合は発生しなかった。また、連続溶接後に実施例１のニッケルメッキを施した抵抗溶接用電極棒の表面を観察したところ、表面のニッケルメッキ層の剥がれもなく、抵抗溶接用電極棒の表面から銅微粉の脱落がなかった。

As shown in (Table 1), the difference in the number of electrode attachments became clear. In Example 1 and Comparative Example 1, in four series welding of current collector welded portions 20a to 20d shown in FIG. 5 (b), the electrode rod for resistance welding is a positive electrode current collector in 500 shots of continuous welding. The problem of adhering to the body 7 did not occur. Moreover, when the surface of the electrode rod for resistance welding which carried out the nickel plating of Example 1 after continuous welding was observed, there was no peeling of the surface nickel plating layer and there was no drop-off of copper fine powder from the surface of the electrode rod for resistance welding. It was.

  In Comparative Example 2 in which a resistance welding electrode rod made of molybdenum not subjected to nickel plating was used, adhesion occurred 52 times in 500 shots of continuous welding. This is a lower value than the resistance welding electrode rod using the chrome copper of the present invention as a material when measuring the current value during continuous welding, and the specific resistance of the material molybdenum itself was high and current was passed. As can be seen from the results of the measured surface temperature of the resistance welding electrode rod, the resistance welding electrode rod and the positive electrode collector were collected due to the rise in the surface temperature of the resistance welding electrode rod during welding. It can be judged that the temperature of the contact surface of the electric body rose and was welded.

  Furthermore, in terms of welding strength, the resistance welding electrode rod made of chromium copper not subjected to nickel plating in Comparative Example 1 despite the use of the resistance welding electrode rod made of the same material as in Example 1 is the lowest. Looking at the current value during continuous welding, it can be seen that the current value flowing during resistance welding is the lowest in Comparative Example 1 and is reduced to 74% from the current value in Example 1. This is because the electrode rod for resistance welding made of the same material as in Example 1 was used, and although the specific resistance of the material itself was the same, the current value was low, and it was left in the atmosphere for a long time. An oxide film is formed on the surface of the electrode rod for resistance welding, and when it is fastened to the electrode rod holder, the electrical resistance with the electrode rod holder increases and the current value decreases. Since the current value was low, the resistance welding ability was reduced and the welding strength was insufficient. In addition, when the oxide film of the electrode rod for resistance welding which does not perform nickel plating of the comparative example 1 is removed, it has confirmed that the electric current equivalent to before leaving flows.

  Further, unlike the nickel plating artificially applied in Example 1, in the case of Comparative Example 1, the oxide film was formed or not formed, or the current value varied in the state of the oxide film. The variation in the welding strength between the body and the electrode group has also been confirmed. In the resistance welding electrode rod of Example 1, there was no difference in the current value flowing during welding even when left in the atmosphere for a long time, so that no oxide film was formed on the surface of the resistance welding electrode rod. I understand.

  Furthermore, in the resistance welding electrode rod of Example 1, since the specific resistance of the nickel plating applied to the surface of the resistance welding electrode rod is high, the rise of the current becomes dull when the current is passed. It has also been confirmed that the occurrence of spatter generated during resistance welding can be reduced without overshoot being suppressed and rapid melting of the metal being welded. Further, even when nickel plating is mixed, even if it is dissolved in an alkaline electrolyte depending on the alkali concentration and potential, it does not precipitate, and it is possible to suppress a short circuit between the positive electrode plate and the negative electrode plate.

  In addition, the result similar to the said Example 1 is obtained also about resistance welding of another component, and resistance welding of another component is demonstrated, referring a figure. As shown in FIG. 6 (a), a resistance welding electrode rod 14a on the positive polarity side and an electrode for resistance welding on the negative polarity side in which electroless nickel plating is applied to the surface of the resistance welding electrode rod 14 excluding the tip end face portion. The electrode rod 14 for resistance welding composed of the rod 14b is pressed against the negative electrode current collector 8, and the electrode group 5 and the negative electrode current collector 8 are resistance-welded and connected. Further, as shown in FIG. 6B, the electrode group 5 to which the negative electrode current collector 8 is connected is housed in the battery case 9, and the resistance welding electrode on the negative polarity side is placed in the hole in the center of the electrode group 5. The rod 14b is inserted, the resistance welding electrode rod 14a on the positive polarity side is pressed from the outer bottom surface of the battery case 9, and the negative electrode current collector 8 and the inner bottom surface of the battery case 9 are welded and connected.

  Further, as shown in FIG. 6C, the positive electrode lead 10 is placed on the positive electrode current collector 7, and a resistance welding electrode rod (not shown) is pressed against the welding portion 10 a of the positive electrode current collector 10 to collect the positive electrode current. The electric body 7 and the positive electrode lead 10 are welded and connected. Further, as shown in FIG. 6D, a sealing body 11 is installed on the positive electrode lead 10 of the electrode group 5 in which the positive electrode lead 10 housed in a battery case (not shown) is welded and the positive electrode current collector 7 is welded. The electrode 11 for resistance welding (not shown) is pressed against the welded portion 10a of the positive electrode lead 10, and the sealing body 11 and the positive electrode lead 10 are welded and connected. In these cases, the same results as in Example 1 were obtained.

  According to the present invention, nickel plating is applied to the surface of the electrode rod for resistance welding made of a material made of chromium copper or a copper alloy, so that copper fine powder does not enter the battery case and there is a concern such as an internal short circuit of the battery. Therefore, resistance welding in a sealed battery can be performed with a stable current value, and it can be used as an electrode manufacturing technique for various batteries with a stable welding strength and is also highly useful.

The schematic diagram of the resistance welding part in the manufacturing apparatus which concerns on one embodiment of this invention 1 is a schematic vertical sectional view of a sealed battery according to an embodiment of the present invention. The enlarged schematic diagram of the resistance welding part which concerns on one embodiment of this invention (A) The schematic diagram which fastened the electrode for resistance welding which concerns on one embodiment of this invention to the electrode rod holder, (b) The schematic diagram which fastened the electrode for resistance welding of the same shape to the electrode rod holder, (c ) Schematic of the same round resistance welding electrode fastened to the electrode rod holder (A) Partial state diagram of a resistance welding part in the manufacturing apparatus according to one embodiment of the present invention, (b) State diagram showing a place where the resistance welding electrode rod of the resistance welding part is pressed. (A) State diagram at the time of resistance welding of the current collector according to one embodiment of the present invention, (b) State diagram at the time of resistance welding of the current collector, (c) After resistance welding of the positive electrode lead State diagram, (d) State diagram after resistance welding of the sealing body Schematic diagram of longitudinal section of cylindrical battery in conventional example State diagram at the time of resistance welding in the conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 End part 4 End part 5 Electrode group 6 Separator 7 Positive electrode collector 8 Negative electrode collector 9 Battery case 10 Positive electrode lead 10a, 10b Welding part 11 Sealing body 12 Safety valve 13 Cap 14 Resistance welding electrode Rod 14a Electrode rod for resistance welding on the positive polarity side 14b Electrode rod for resistance welding on the negative polarity side 15 Plating layer 16 Electrode rod holder 17 Fastening bolt 18 Pressure follow-up portion 19 Pressure drive portion 20a, 20b, 20c, 20d Electric welding part 21 Welding power supply part 22 Pedestal

Claims (5)

Sealing plate, lead, current collector, electrode group, and battery case components in sealed battery using resistance welding electrode rod, sealing plate and lead, lead and positive electrode current collector, electrode group and positive electrode current collector Body or negative electrode current collector, a sealed battery manufacturing method for resistance welding a negative electrode current collector and a battery case, wherein the resistance welding electrode rod is made of a material made of chromium copper, and the resistance welding electrode rod Manufacturing of a sealed battery characterized in that the electrode rod for resistance welding, which is plated with electroless nickel or electrolytic nickel on the surface excluding the end face of the electrode , is pressed against the component and connected by resistance welding. Method. An apparatus for manufacturing a sealed battery for resistance-welding components to be electrically connected in a sealed battery, comprising: a pedestal on which the component is placed; and chromium copper or a copper alloy for energizing and resistance-welding the component. A resistance welding electrode rod in which electroless nickel plating or electrolytic nickel plating is applied to the surface of the resistance welding electrode rod, excluding the tip end face portion , made of a material, an electrode rod holder for holding the resistance welding electrode rod, and the resistance A pressure drive unit for applying a pressure to the welding electrode rod, a pressure follow-up unit for transmitting the pressure of the pressure drive unit to the electrode rod holder, and a welding power source unit for energizing the resistance welding electrode rod An apparatus for manufacturing a sealed battery, comprising: The apparatus for manufacturing a sealed battery according to claim 2 , wherein the cross-sectional shape of the electrode rod for resistance welding is round or square. 3. The sealed battery manufacturing apparatus according to claim 2 , wherein the electrode rod holder for holding the resistance welding electrode rod is made of a material made of copper or a copper alloy. 3. The sealed battery according to claim 2 , wherein electroless nickel plating or electrolytic nickel plating is applied to the entire surface of an electrode rod holder for holding a resistance welding electrode rod or a portion where the resistance welding electrode rod contacts. Manufacturing equipment.

Images