JP5050313B2 - Battery and battery manufacturing method - Google Patents

Description

  The present invention relates to a battery having a battery element in which a plurality of positive plates and a plurality of negative plates are stacked via a separator, and a method for manufacturing the same, and in particular, a lead portion of one polarity plate extends in a predetermined direction. The present invention relates to a battery in which each end is bonded to a current collector plate and a method for manufacturing the same.

Conventionally, it has a battery element in which a plurality of positive plates and a plurality of negative plates are laminated via a separator, and a lead portion of one of the plates (positive plate or negative plate) extends in a predetermined direction, A battery is known in which end portions are each joined to a current collector plate (a positive electrode current collector plate or a negative electrode current collector plate). For example, Patent Document 1 discloses an example thereof.
In the battery of Patent Document 1, a required amount of brazing alloy powder made into a slurry with a binder is applied to the surface of the current collector plate on the electrode plate side, and reflowed to the surface on the electrode plate side. Put the brazing material. Then, in a state where the lead portion of one electrode plate is in pressure contact with the surface on the electrode plate side of this current collector plate, the brazing material is melted by irradiating an electron beam from the outside, and the current collector plate and the lead portion of the electrode plate The current collector plate and one of the electrode plates are joined by joining them through a brazing material (see FIGS. 10 and 11 of Patent Document 1 and the description thereof).

JP 2001-93505 A

  In the battery of Patent Document 1, the connection reliability between the current collector plate and one polarity electrode plate is sufficiently high. However, once the brazing material is reflowed to the current collector plate, the cost of the brazing material itself and the manufacturing cost associated with the reflowing of the brazing material are high, resulting in high battery costs.

  The present invention has been made in view of the current situation, and provides a battery and a method of manufacturing the same that can reduce the cost of the battery while ensuring the connection reliability between the current collector plate and the electrode plate of the power generation element. For the purpose.

The solution includes a power generation element in which a plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators, and the lead portions of one polarity electrode plate all extend in a predetermined direction; of plate of polarity, a battery and a respectively bonded formed by the current collector plate is an end portion of the lead portion, both the ends of the lead portions, about its said end In the state in which the metal fillet made of the current collector plate melted by the electron beam or laser irradiated from the outside of the current collector plate opposite to the part is joined to the current collector plate, respectively. It is a battery.

According to the present invention, each end of the lead portion of the electrode plate is joined to the current collector plate in a state where a metal fillet forming the current collector plate is formed around itself. In such a battery, since the electrode plate (lead part) and the current collector plate are reliably joined by the fillet, the connection reliability thereof is high. Moreover, since the fillet is formed of a metal that forms a current collector plate, a brazing material is not required as in the prior art. For this reason, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not applied, and an inexpensive battery can be obtained.

Here, the “power generation element” is a structure in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators, and the lead portions of one polar plate extend in a predetermined direction. If there is, the form and the like are not particularly limited.
In the present invention, the present invention may be applied to at least one of the positive electrode plate and the negative electrode plate, and only the negative electrode plate, only the positive electrode plate, or the positive electrode plate and the negative electrode plate. The present invention may be applied to both the plates.
The “current collector plate” is not particularly limited as long as the end portions of the lead portions are joined to each other.

Incidentally, the present invention, the battery whose ends are joined to the current collector plate in a state of forming a fillet by the metal forming the collector plate around both its lead portion, as described later, the end of the lead portion the corresponding groove can be formed by utilizing a current collector plate having inwardly in a one-to-one to the section. However, it is sufficient that the fillet is formed as described above in the manufactured battery, and it goes without saying that the battery manufactured by any other method is also included in the present invention.

Another solution is a power generation element in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators, and the lead portions of one polar plate extend in a predetermined direction. And a current collector plate formed by joining the end portions of the lead portions of the one polar plate, wherein the end portions of the lead portions are paired with each other . 1 is inserted into each of the concave grooves of the current collector plate having a corresponding concave groove on the inside, and irradiated with an electron beam or a laser from the outside of the current collector plate opposite to the end portion. The battery is formed by melting a portion of the plate forming the concave groove and joining the end portion of the lead portion and the current collector plate, respectively .

Cell of the present invention, the end of the lead portion, inserting them into the groove of the current collecting plate having a corresponding groove on the inside in these one-to-one, outside the opposite side of the current collector plate to the end portion Are irradiated with an electron beam or a laser to melt a portion of the current collector plate that forms a concave groove (inner wall portion of the concave groove), and the end portion of the lead portion and the current collector plate are joined to each other. In such a battery, the end portion of the lead portion is joined to the current collector plate in a state where a metal fillet forming the current collector plate is formed around the lead portion. Therefore, the bonding strength between the electrode plate and the current collector plate is high, and the connection reliability is high. Moreover, since no brazing material is used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not incurred, and an inexpensive battery can be obtained.

  Furthermore, in the battery described above, the cross section is substantially V-shaped, and in this substantially V-shaped cross section, the minimum value of the angle formed by the two left and right tangents at the same depth is not less than 30 degrees and not more than 90 degrees. It is preferable that the battery is formed by joining the end portion of the lead portion to the current collector plate having the concave groove.

When the groove has a substantially V-shaped cross section, if the angle of the cross section of the groove is too narrow, it becomes difficult to insert the end of the lead portion of the electrode plate deeply into the groove during manufacturing. Difficult to join the current collector plate. On the other hand, if the angle of the cross section of the groove is too wide, when the portion forming the groove of the current collector plate is melted during manufacture, the molten metal does not sufficiently contact the end of the lead portion of the electrode plate. In this case, it is difficult to join the lead portion of the electrode plate and the current collector plate because the fillet is hardly formed. Therefore, even if the angle of the cross section of the groove is too narrow or too wide, the connection reliability between the electrode plate and the current collector plate may be reduced.
In contrast, in the present invention, the angle of the cross section of the groove having a substantially V-shaped cross section is set to 30 degrees or more and 90 degrees or less. By using the current collector plate with such a concave groove, the end of the lead portion of the electrode plate can be inserted into the concave groove more reliably, and more reliably when the portion of the current collector plate forming the concave groove is melted. In addition, since the fillet can be formed around the end portion, the lead portion of the electrode plate and the current collector plate can be reliably joined. Therefore, a battery with high connection reliability between the electrode plate of one polarity and the current collector plate can be obtained.

  In addition, the angle of the groove cross section in the present invention refers to the minimum value of the angle formed by the two left and right tangents at the same depth as described above. For example, when the cross section of the groove is completely V-shaped, or when the groove bottom and groove opening are curved and the groove middle is straight, the angle formed by the straight line portion is the groove The angle of the cross section. On the other hand, when the cross section of the concave groove is curved as a whole, the angle formed by the two left and right tangents at the inflection point is the angle of the cross section of the concave groove.

  Furthermore, when the battery according to any one of the above is formed by joining the end portion of the lead portion to the current collector plate having the concave groove having a depth of 0.1 mm or more. good.

If the depth of the groove is shallow, the end of the lead part of the electrode plate cannot be inserted deeply into the groove, and it is difficult to reliably join the lead part of the electrode plate and the current collector plate. May decrease.
On the other hand, in the present invention, since the depth of the groove is as deep as 0.1 mm or more, the end portion of the lead portion of the electrode plate can be inserted deeply into the groove, It becomes possible to join the current collector plate more reliably. Therefore, a battery with high connection reliability between the electrode plate of one polarity and the current collector plate can be obtained.

  The battery according to any one of the above, further comprising: a container body member that houses the power generation element; and a battery container having a sealing member that seals the container body member, wherein the sealing member includes the current collector. A battery that is a current collecting and sealing member that also serves as a plate is preferable.

  According to the present invention, since the sealing member of the battery container also serves as the current collector plate, the current collector plate for one polarity existing in the conventional sealed battery can be eliminated. As a result, a large storage space for the power generation element can be secured. Further, by using both the current collector plate and the sealing member, the battery conduction path between the electrode plate of one polarity and the current collector sealing member can be shortened, and the electrical resistance there can be reduced. For this reason, the output of a battery can be improved. Furthermore, the battery can be made cheaper as much as the current collector plate is eliminated.

Another solution is a power generation element in which a plurality of positive plates and a plurality of negative plates are alternately stacked via separators, and the lead portions of one polar plate extend in a predetermined direction. And a current collector plate formed by joining the end portions of the lead portions of the one polarity electrode plate, and a pair of the end portions of the lead portions . 1 for inserting the end of the lead portion into the corresponding groove, and inserting the end portion of the lead portion into the concave portion. In the state of being inserted into the groove, the lead portion is irradiated with an electron beam or a laser from the outside of the current collector plate opposite to the end portion to melt a portion of the current collector plate forming the concave groove. And a welding step for joining the end portions of the current plate to the current collector plate, respectively. It is a manufacturing method.

According to the present invention, the end of the lead portion of the electrode plate of one polarity, inserted in the concave groove of the collector plate with a corresponding groove on the inside in these one-to-one, irradiated with an electron beam or the like Then, the portion of the current collector plate that forms the concave groove (the inner wall portion of the concave groove) is melted, and the lead portion of the electrode plate of one polarity is joined to the current collector plate. If the battery is manufactured by such a method, the end portions of the lead portions are joined to the current collector plates in a state where metal fillets forming the current collector plates are formed around the lead portions. Therefore, the lead portion of one polarity electrode plate and the current collector plate have high bonding strength, and a battery having high connection reliability can be manufactured. Further, since the brazing material is not used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not applied, and the battery can be manufactured at low cost.

  Furthermore, in the battery manufacturing method described above, the concave groove may be a battery manufacturing method formed by pressing.

  According to the present invention, the battery is manufactured using the current collector plate in which the concave grooves are formed by press working. Since the current collector plate in which the concave grooves are formed by press working is inexpensive, if this is used, an inexpensive battery can be manufactured.

  The method for manufacturing a battery according to any one of the above, wherein the concave groove has a substantially V-shaped cross section, and an angle formed by two left and right tangents at the same depth in the substantially V-shaped cross section. It is preferable that the battery has a minimum value of 30 degrees or more and 90 degrees or less.

  According to the present invention, a battery is manufactured by using a current collector plate having an angle of a cross section of a groove having a substantially V-shaped cross section of 30 degrees or more and 90 degrees or less. By setting the angle of the cross section of the groove to 30 degrees or more, it becomes easier to reliably insert the end of the lead portion of the electrode plate into the groove in the end insertion step. The electric plate can be more reliably joined. Also, by setting the angle of the cross section of the groove to 90 degrees or less, when the portion forming the groove of the current collector plate is melted in the welding process, the molten metal contacts the end of the lead portion of the electrode plate. Since the fillet can be reliably formed around the end portion, the lead portion of the electrode plate and the current collector plate can be more reliably joined. Therefore, a battery with high connection reliability between the electrode plate of one polarity and the current collector plate can be manufactured.

  Furthermore, in the battery manufacturing method according to any one of the above, it is preferable that the concave groove has a depth of 0.1 mm or more.

  According to the present invention, a battery is manufactured using a current collector plate having a groove depth of 0.1 mm or more. By increasing the depth of the concave groove to 0.1 mm or more, the end of the lead portion of the electrode plate can be inserted deeply into the concave groove in the end portion insertion process. The electric plate can be more reliably joined. Therefore, a battery with high connection reliability between the electrode plate of one polarity and the current collector plate can be manufactured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a view of a sealed battery (battery) 100 according to the present embodiment as viewed from the first side surface portion 111c side. FIG. 2 is a view of the sealed battery 100 as viewed from the outer surface 115 a side of the current collecting and sealing member 115. FIG. 3 shows a view of the sealed battery 100 as seen from the third side surface portion 111e side. FIG. 4 shows a view of the sealed battery 100 as seen from the upper surface portion 111a side. FIG. 5 shows a cross-sectional view of the sealed battery 100.

  The sealed battery 100 is a secondary battery such as a nickel metal hydride storage battery or a lithium ion battery, which is used as a power source for an electric vehicle or a hybrid car, and is a rectangular battery having a substantially rectangular parallelepiped shape. The sealed battery 100 includes a battery container 110 having a rectangular parallelepiped shape, a power generation element 120 accommodated in the battery container 110, a positive current collector 130 fixed in the battery container 110, and a battery container 110. The external positive electrode terminal 140 and the like are fixed to the container, and an electrolytic solution is injected into the container (see FIGS. 1 to 5).

Among them, the power generation element 120 (see FIG. 5) includes a plurality of positive plates 121 having positive electrode active material layers 121 s and a plurality of negative plates 123 having negative electrode active material layers 123 s stacked alternately via separators 125. Is configured. Of the negative electrode plate 123, the negative electrode lead portion 123r in which the negative electrode active material layer 123s is not formed extends in a predetermined direction (left side in FIG. 5). On the other hand, in the positive electrode plate 121, the positive electrode lead part 121r in which the positive electrode active material layer 121s is not formed extends in the opposite direction to the negative electrode lead part 123r (right side in FIG. 5).

The battery container 110 includes a deep bottomed rectangular tube-shaped container body member 111 made of a conductive material (nickel-plated steel plate), and a current collecting sealing member 115 that is also made of a conductive material (nickel-plated steel plate) and seals the container body member 111. It consists of and.
In addition, in the battery container 110, the current collector sealing member 115 also serves as a current collector and needs to be made of a conductive material. However, other portions are made of a conductive material but are made of an insulating material. It may be formed. When a metal is used for the battery container 110, it may be appropriately selected in view of resistance (alkali resistance), strength, electrical stability, etc. to the electrolyte. Examples of usable metals include aluminum and aluminum alloys, Examples thereof include carbon steel subjected to nickel plating and austenitic stainless steel containing a large amount of nickel. Also, when using a resin for the battery container 110, it may be appropriately selected in view of resistance (alkali resistance) or strength to the electrolytic solution. For example, usable resins include polypropylene, polyethylene, polystyrene, and modified resins. Examples thereof include a copolymer of polyphenylene ether and polystyrene, ABS resin, acrylonitrile styrene resin, polyamide, vinyl chloride resin, vinylidene chloride resin, methacrylic resin, and polymer blends or polymer alloys thereof.

  The container main body member 111 (see FIGS. 1 to 5) includes a flat and rectangular upper surface portion 111a, a lower surface portion 111b parallel to the upper surface portion 111a and having the same shape as the upper surface portion 111a, and a long side and a lower surface portion of the upper surface portion 111a. Two flat side surfaces (first side surface portion 111c and second side surface portion 111d) that connect the long side of 111b, and a flat side surface portion that connects the short side of the upper surface portion 111a and the short side of the lower surface portion 111b (Third side surface portion 111e). A through hole is formed in the upper surface portion 111a at substantially the center thereof, and a safety valve 113 is fixedly provided. In addition, two through holes are formed in the third side surface portion 111e at predetermined intervals in the vertical direction, and external positive electrode terminals 140 described later are respectively fixed.

The current collecting sealing member 115 has a flat plate shape and also serves as a negative electrode current collecting plate. In addition, the figure which looked at the current collection sealing member 115 of the single-piece | unit state from the inner surface 115b side in FIG. 6 is shown. FIG. 7 shows a part of the AA cross section of FIG. Further, FIG. 8 shows a state where the negative electrode lead portion 123r of the negative electrode plate 123 is joined to the portion corresponding to FIG.
The current collecting and sealing member 115 is formed with four outer convex portions 117 having a rectangular shape in plan view protruding from the inner side surface 115b toward the outer side surface 115a at predetermined intervals in the vertical direction. Further, the current collecting and sealing member 115 is formed with inner convex portions 119 each having an oval shape in a plan view projecting from the outer surface 115 a side to the inner surface 115 b side on the upper side and the lower side of each outer convex portion 117. ing.
In addition, the container main body member 111 and the current collecting sealing member 115 are joined by laser welding over the entire circumference in a state where the container main body member 111 is covered with the current collecting sealing member 115.

  Of the power generation element 120 described above, the negative electrode lead portion 123r of the negative electrode plate 123 is directly joined to the inner side surface 115b of the current collecting sealing member 115 by electron beam welding (see FIGS. 5 and 8). Specifically, the end portion 123rt of the negative electrode lead portion 123r is joined to the current collecting sealing member 115 in a state where a fillet 115f made of metal (steel plate component) forming the current collecting sealing member 115 is formed around itself. Yes.

The negative electrode plate 123 and the current collecting and sealing member 115 thus bonded have high bonding strength and high connection reliability. Further, since the brazing material is not used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not applied, and the inexpensive sealed battery 100 can be obtained.
Further, as in this embodiment, by directly joining the negative electrode lead portion 123r of the negative electrode plate 123 to the current collecting and sealing member 115, the current collecting and sealing member 115 also serves as the negative electrode current collecting plate. The board can be eliminated. As a result, a large accommodation space for the power generation element 120 can be secured. In addition, the battery conduction path between the power generation element 120 (the negative electrode plate 123) and the current collecting and sealing member 115 can be shortened and the electrical resistance can be reduced. For this reason, the output of the sealed battery 100 can be improved. Further, the sealed battery 100 can be reduced in size and cost by the amount that the negative electrode current collector plate is eliminated.

  The positive electrode current collector plate 130 (see FIG. 5) is made of a conductive material (nickel plated steel plate) and has a flat plate shape. The positive electrode current collector plate has eight oval inner convex portions 131 that are oblong in plan view and are long in the width direction (the direction perpendicular to the paper surface in FIG. 5) protruding toward the inner side surface 130b (left side in FIG. 5). Is formed.

Of the power generation element 120 described above, the positive electrode lead portion 121r of the positive electrode plate 121 is joined to the inner side surface 130b of the positive electrode current collector plate 130 by electron beam welding (see FIG. 5). Specifically, in the same manner as the above-described negative electrode lead portion 123r (see FIG. 8), each end of the positive electrode lead portion 121r is formed with a metal fillet that forms the positive electrode current collector plate 130 around itself. It is joined to the current collector plate 130.
The positive electrode plate 121 and the positive electrode current collector plate 130 thus bonded also have high bonding strength and high connection reliability, like the negative electrode plate 123 and the current collector sealing member 115. Further, since the brazing material is not used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not applied, and the inexpensive sealed battery 100 can be obtained.

The external positive electrode terminal 140 (see FIG. 5) includes a hollow cylindrical pole post 141 whose one end (left side in FIG. 5) is closed, and a radially outer side from the other end (right side in FIG. 5) of the pole post 141. And a collar portion 143 extending to the bottom. The pole column 141 is inserted in a through hole of the battery container 110 (container body member 111) with a sealing member 145 having electrical insulation between the battery container 110 and the pole column 141, and the one end side is It is located inside the battery and is inserted so that the other end side is located outside the battery. The one end side of the pole post 141 swells radially outward (in the vertical direction in FIG. 5) to form a compression deformed portion 141 h, and the inner side surface of the third side face 111 e of the battery container body 111. A part of the seal member 145 is sandwiched between them to compress the seal member 145. In addition, the flange portion 143 also compresses the seal member 145 by sandwiching a part of the seal member 145 between the outer side surface of the third side surface portion 111e of the battery container body 111.
The external positive electrode terminal 140 is joined to the positive electrode current collector plate 130 by laser welding in a state where the outer surface 130a (right side in FIG. 5) of the positive electrode current collector plate 130 is in contact with the compression deformation portion 141h.

The sealed battery 100 described above is manufactured as follows. That is, the power generation element 120 is created by a known method.
Moreover, the current collection sealing member 115 is created. As shown in FIG. 6, the current collecting and sealing member 115 used in this embodiment has a groove 119 m extending in the vertical direction in FIG. The number is formed. As shown in FIG. 7, the groove 119m has a substantially V-shaped cross section. More specifically, in the cross section, the groove bottom 119mp is curved so that the corners are rounded, and the groove opening 119mq is curved outward, while the groove middle 119mr is a straight line. I am doing. And, in the straight line portion of the concave groove middle portion 119 mr, the angle α formed is set to 30 degrees or more and 90 degrees or less (45 degrees in the present embodiment). Further, the depth D of the concave groove 119m is 0.1 mm or more (0.3 mm in this embodiment). Such a concave groove 119m is formed by press working.

  On the other hand, the positive electrode current collector plate 130 is prepared. Similarly to the concave groove 119m of the current collector sealing member 115, the positive electrode current collecting plate 130 also has a concave groove (not shown) extending in the vertical direction in FIG. The same number is formed. These concave grooves have the same form as the concave grooves 119m of the current collecting and sealing member 115 (see FIGS. 6 and 7). That is, the cross section is substantially V-shaped, and in the cross section, the bottom of the concave groove is curved so that the corners are rounded, and the concave groove opening is curved outwardly, whereas the middle of the concave groove The part is straight. The angle formed by the straight portion of the middle portion of the groove is 30 degrees or more and 90 degrees or less (45 degrees in the present embodiment). Further, the depth of the groove is 0.1 mm or more (0.3 mm in this embodiment). Such a concave groove is also formed by pressing.

Next, the end portion 123rt of the negative electrode lead portion 123r of the power generation element 120 is inserted into the corresponding concave groove 119m in the inner convex portion 119 of the current collecting and sealing member 115 (end portion inserting step).
Thereafter, with the end 123rt inserted in the concave groove 119m, an electron beam is irradiated from the outer surface 115a side of the current collecting sealing member 115 toward the inner convex portion 119, and the concave groove 119m of the current collecting sealing member 115 is formed. The formed portion (the inner wall portion 115h of the concave groove 119) is once melted, and the end portion 123rt of the negative electrode lead portion 123r is joined to the current collecting sealing member 115 (welding process). At this time, fillets 115f made of metal (steel plate component) forming the sealing current collecting plate 115 are formed around the end 123rt, and the negative electrode lead portion 123r is firmly joined to the current collecting sealing member 115. Note that the welding process may be performed by irradiating a laser instead of the electron beam.

The negative electrode plate 123 and the current collecting and sealing member 115 bonded in this way have high bonding strength and high connection reliability. Furthermore, since no brazing material is used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not incurred, and the sealed battery 100 can be manufactured at low cost.
Furthermore, in the present embodiment, as described above, the angle of the cross section of the concave groove 119m having a substantially V-shaped cross section is set to 30 degrees or more and 90 degrees or less (specifically 45 degrees). The portion 123rt can be more reliably inserted into the concave groove 119m. This further melts the portion forming the concave groove 119m of the current collecting and sealing member 115, so that the end 123rt of the negative electrode lead portion 123r and the current collecting and sealing member 115 can be reliably joined. Further, since the depth of the concave groove 119m is 0.1 mm or more (specifically 0.3 mm), the end 123rt of the negative electrode lead portion 123r can be inserted deeply into the concave groove 119m. The end 123rt of 123r and the current collecting and sealing member 115 can be more reliably joined. Therefore, the connection reliability between the negative electrode plate 123 and the current collecting and sealing member 115 can be improved.

Next, the end portion insertion step and the welding step are performed on the positive electrode side as well as the negative electrode side.
That is, first, the end portion of the positive electrode lead portion 121r of the power generation element 120 is inserted into the corresponding concave groove (not shown) of the inner convex portion 131 of the positive electrode current collector plate 130 (end portion insertion step).
Thereafter, with the end portion of the positive electrode lead portion 121r being inserted into the concave groove of the positive electrode current collector plate 130, an electron beam is irradiated from the outer surface 130a side of the positive electrode current collector plate 130 toward the inner convex portion 131, so A portion of the electric plate 130 forming a concave groove (inner wall portion of the concave groove) is once melted, and the end portions of the positive electrode lead portion 121r are respectively joined to the positive electrode current collector plate 130 (welding process). At this time, metal fillets forming the positive current collector plate 130 are formed around the ends of the positive electrode lead portion 121r, and the positive electrode lead portion 123r is firmly bonded to the positive electrode current collector plate 130. Here, the welding process can also be performed by irradiating a laser instead of the electron beam.

Also on the positive electrode side, the positive electrode plate 121 and the positive electrode current collector plate 130 have high bonding strength and high connection reliability. Furthermore, since no brazing material is used as in the prior art, the cost of the brazing material itself and the manufacturing cost associated with the reflow of the brazing material are not incurred, and the sealed battery 100 can be manufactured at low cost.
Furthermore, as described above, the angle of the cross section of the groove having a substantially V-shaped cross section is set to 30 degrees or more and 90 degrees or less (specifically 45 degrees), so that the end of the positive electrode lead portion 121r is more reliably recessed. Can be inserted into the groove. In addition, the portion forming the concave groove of the positive electrode current collector plate 130 is melted, and the end portion of the positive electrode lead portion 121r and the positive electrode current collector plate 130 can be reliably bonded. Further, since the depth of the groove is 0.1 mm or more (specifically 0.3 mm), the end of the positive electrode lead portion 121r can be inserted deeply into the groove, so that the end of the positive electrode lead portion 123r can be inserted. And the positive electrode current collector plate 130 can be more reliably joined. Therefore, the connection reliability between the positive electrode plate 121 and the positive electrode current collector plate 130 can be improved.

  Separately, the external positive electrode terminal 140 is fixed to the container body member 111. That is, the seal member 145 is mounted in the through hole of the container body member 111, and the pole portion 141 of the external positive terminal 140 having the flange portion 143 and the pole column portion 141 having a U-shaped cross section is inserted from the outside. A fluid pressure is applied to the cylinder of the column 141 to bulge one end side of the pole column 141 outward in the radial direction, and further compressively deform in the axial direction to form a compression deformed portion 141h.

Next, among the joined body composed of the power generation element 120, the current collecting and sealing member 115, and the positive current collecting plate 130, the positive current collecting plate 130 and the power generating element 120 are inserted into the container main body member 111, and the current collecting and sealing member At 115, the container body member 111 is covered. Then, the laser is irradiated from the outside, the current collecting sealing member 115 and the container main body member 111 are joined, and the container main body member 111 is sealed.
Next, a laser is irradiated from the outside of the external positive electrode terminal 140 toward the dent of the pole column portion 141 to join the compression deformation portion 141 h of the pole column portion 141 and the positive electrode current collector plate 130.
Then, if the electrolyte solution is injected from the through hole (injection port) in which the container body member 111 is formed, and the safety valve 113 is attached so as to close the injection port, the sealed battery 100 is completed.

In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof. .
For example, in the above embodiment, the present invention is applied to the bonding of the positive electrode plate 121 and the positive electrode current collector plate 130 and the bonding of the negative electrode plate 123 and the current collecting sealing member 115. The present invention may be applied to only one of 123.
In the above embodiment, the sealing member 115 also serves as the negative electrode current collector plate. However, a separate negative electrode current collector plate may be provided, and the present invention may be applied to the negative electrode current collector plate.

It is a top view from the 1st side part side of the sealed battery which concerns on embodiment. It is the top view which looked at the sealed type battery which concerns on embodiment from the outer surface side of the current collection sealing member. It is the top view which looked at the sealed battery which concerns on embodiment from the 3rd side part part side. It is the top view which looked at the sealed battery which concerns on embodiment from the upper surface part side. It is sectional drawing of the sealed battery which concerns on embodiment. It is the top view which looked at the current collection sealing member which comprises the sealed battery which concerns on embodiment from the inner surface side. It is sectional drawing which shows a part of AA cross section of FIG. 6 among the current collection sealing members which comprise the sealed battery which concerns on embodiment. It is sectional drawing of the part corresponded in FIG. 7 in the state which comprised the battery among the sealed batteries which concern on embodiment.

Explanation of symbols

100 Sealed battery (battery)
110 Battery container 111 Container main body member 115 Current collecting seal member 115f Fillet 119 Inner convex portion 119m (of the current collecting seal member) Groove groove 121 Positive electrode plate 121r Positive electrode lead portion 123 Negative electrode plate 123r Negative electrode lead portion 123rt ( End 125 of negative electrode lead part Separator 130 Positive electrode current collector 131 Inner convex part (of positive electrode current collector)

Claims (9)

A plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators, and a power generation element in which the lead portions of one polarity electrode plate all extend in a predetermined direction,
A current collecting plate formed by joining the end portions of the lead portions of the one polar electrode plate,
A battery comprising:
Both the ends of the lead portions, around itself and said end portion is melted by an electron beam or laser irradiated from the outside of the opposite side of the collector plate, a metal forming the collector plate A battery formed by joining the current collector plate in a state where a fillet is formed. A plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators, and a power generation element in which the lead portions of one polarity electrode plate all extend in a predetermined direction,
A current collecting plate formed by joining the end portions of the lead portions of the one polar electrode plate,
A battery comprising:
The end portions of the respective lead portions are respectively inserted into the concave grooves of the current collector plate having concave grooves corresponding to the one-to-one correspondence on the inside, and the current collector plate on the side opposite to the end portions. from the outside by irradiating an electron beam or a laser, to melt a portion forming the groove of the collector plate, formed by joining the said end of the lead portion and the collector plate respectively battery. The battery according to claim 2,
The current collector having the concave groove in which the cross section is substantially V-shaped, and the minimum value of the angle formed by the two left and right tangents at the same depth is 30 degrees or more and 90 degrees or less A battery formed by joining the end of the lead portion to a plate. A battery according to any one of claims 2 or 3,
A battery formed by joining the end portion of the lead portion to the current collector plate having the concave groove having a depth of 0.1 mm or more. It is a battery as described in any one of Claims 1-4, Comprising:
A container body member that houses the power generation element, and a battery container having a sealing member that seals the container body member,
The battery, wherein the sealing member is a current collecting and sealing member that also serves as the current collecting plate. A plurality of positive electrode plates and a plurality of negative electrode plates are alternately stacked via separators, and a power generation element in which the lead portions of one polarity electrode plate all extend in a predetermined direction,
A current collecting plate formed by joining the end portions of the lead portions of the one polar electrode plate,
A battery manufacturing method comprising:
End insertion step of inserting the end of the lead part into the corresponding groove, respectively, with respect to the current collecting plate having the concave part corresponding to the end of the lead part on a one-to-one basis When,
With the end portion of the lead portion inserted into the concave groove, an electron beam or a laser is irradiated from the outside of the current collector plate opposite to the end portion, and the concave groove of the current collector plate is A welding step of melting a portion to be formed and joining the end portions of the lead portions to the current collector plates, respectively;
A method for manufacturing a battery comprising: It is a manufacturing method of the battery of Claim 6, Comprising:
The method for manufacturing a battery in which the concave groove is formed by press working. A method for producing a battery according to claim 6 or 7,
The concave groove has a substantially V-shaped cross section, and in this substantially V-shaped cross section, the minimum value of the angle formed by the two left and right tangents at the same depth is not less than 30 degrees and not more than 90 degrees. Production method. It is a manufacturing method of the battery as described in any one of Claims 6-8,
The method for manufacturing a battery, wherein the groove has a depth of 0.1 mm or more.

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