JP7120069B2 - BATTERY MANUFACTURING METHOD AND BATTERY - Google Patents

Description

TECHNICAL FIELD The present invention relates to a battery having an electrode laminate in which a positive electrode plate, a negative electrode plate and a separator are stacked, and a manufacturing method thereof. More specifically, the present invention relates to a battery using an electrode laminate in which a card-like positive electrode plate, a negative electrode plate, and a separator are laminated, and a manufacturing method thereof.

Electrode laminates in batteries include a wound type in which strip-shaped electrode plates are wound, and a laminated type in which card-shaped electrode plates are laid flat. Patent Document 1 discloses a conventional technique related to a laminated electrode laminate. In the technique of the document, when stacking the electrode plates on the mounting portion, the mounting portion is tilted and vibrated appropriately (claim 1, etc.). This is for alignment of the electrode plates. This is because, in the laminated type, each electrode plate is separated from each other, so alignment is important.

JP 2015-163546 A

However, the conventional techniques described above have the following problems. Alignment may fail. This is because, in the technique of Patent Document 1 mentioned above, the end portions of the electrode plates are brought into contact with "36" (wall) on "33" (laminating table) in FIG. 3 for alignment. However, the edges of the electrode plates are fragile. Electrode plates generally consist of a collector foil with electrode active material layers formed on both sides. be. For this reason, when aligning, the vicinity of the end in contact with "36" (wall) may be wrinkled and deformed due to the load. If this happens, the alignment will fail. Such a situation is likely to occur in the prior art.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above. The object is to provide a battery and method of manufacturing the same in which the electrode plates in the electrode stack are reliably aligned.

A method for manufacturing a battery according to one aspect of the present invention is a method for manufacturing a battery by housing an electrode laminate obtained by stacking a positive electrode plate, a negative electrode plate, and a separator in an outer package. The separator and the separator are integrated in advance in the form of a card, and there is a power storage part in which the positive plate, the negative plate, and the separator all exist, a positive current collector in which only the positive plate exists, and a negative electrode collector in which only the negative plate exists. A laminated plate manufacturing process for producing a laminated plate having a current part, and an electrode lamination by laminating the laminated plates so that the power storage parts, the positive electrode current collectors, and the negative electrode current collectors overlap each other when viewed from above. During the laminated plate manufacturing process, at least one of the positive electrode current collector and the negative electrode current collector in each laminated plate is partially bent or bent to the other portion. Then, an erecting shape forming step is performed to form an erected erected shape portion, and in the stacking step, the erected shape portions are overlapped with each other when viewed from above.

In the battery manufacturing method of the above aspect, the upright shape portion is formed in at least one of the positive electrode current collector and the negative electrode current collector in the upright shape forming step in the laminated plate manufacturing step. The laminated plate used in the lamination process has an upright portion. For this reason, of the positive current collector and the negative current collector, the one in which the upright portion is formed has higher rigidity than the flat one. Therefore, it is possible to align the alignment plates in the electrode laminate with high accuracy. In this way, a battery can be obtained in which the electrode plates in the electrode stack are reliably aligned.

In the battery manufacturing method of the above aspect, it is preferable that, after the stacking step, a terminal joining step of joining a terminal connecting member for connection with an external terminal to the overlapping portions of the upright portions is performed. Thereby, a connection structure between the electrode laminate and the external terminal is obtained. It is advantageous to make the battery more compact by using the upright shape portion, which is used to increase the alignment accuracy of the alignment plate, also for joining with the terminal connection member.

In the method for manufacturing a battery according to any one of the above aspects, in the standing shape forming step, at least one of the positive current collecting portion and the negative current collecting portion of each laminated plate is notched so as to be aligned with each other. It is desirable that the portion farther than the notch be the upright shape portion. With this configuration, the strain applied to the current collecting portion due to the formation of the standing shape portion can be minimized.

In the method of manufacturing a battery in which a cut is made in the current collecting part, the cut is made in the shape of a polygonal line, a curved line, or an oblique line in the direction of approaching the power storage part from the end position away from the power storage part in the standing shape forming step. is desirable. By doing so, the portion farther from the cut as viewed from the power storage unit can be formed into an upright shape simply by bending or curving. In that case, the upright portion can be formed at the same time as the positive electrode plate and the negative electrode plate are attached.

A battery according to another aspect of the present invention includes an electrode laminate obtained by stacking a positive electrode plate, a negative electrode plate, and a separator, and is housed in an outer package. A positive electrode plate and a negative electrode plate , which are formed by forming electrode active material layers on both sides of a foil, are laminated with a separator interposed therebetween. A positive current collecting part having only a non- coated part of only the current collecting foil on the plate and a negative current collecting part having only a non-coated part of only the current collecting foil on the negative plate , and the negative electrode current collector protrude in opposite directions from the power storage unit, and at least one of the positive electrode plate of the positive electrode current collector and each negative electrode plate of the negative electrode current collector is partially An upright shape part is formed by bending or curving to raise the other part, and the upright shape parts are arranged so that they overlap each other when viewed from above. A terminal connection member connected to the external terminal is joined.

In the battery of the above aspect, the alignment accuracy of the positive electrode plate and the negative electrode plate in the electrode laminate is high. Also, the joint structure of the terminal connecting member is compact.

According to this configuration, a battery and method of manufacturing the same are provided in which the electrode plates in the electrode stack are reliably aligned.

1 is an external view of a battery according to this embodiment; FIG. It is a perspective view of the electrode laminated body which concerns on this form. FIG. 4 is a perspective view showing a laminated plate that constitutes the electrode laminate of the present embodiment; FIG. 4 is a front view of a negative electrode current collector and its upright portion; (Comparative example) Fig. 10 is a side cross-sectional view showing a situation in which alignment has failed due to wrinkling of the current collector. FIG. 4 is a front view showing a state in which the negative electrode terminal connecting member is joined to the electrode laminate. FIG. 4 is a perspective view showing a state in which a negative terminal connecting member is joined to an electrode laminate; It is a schematic diagram explaining the manufacturing method of the electrode laminated body which concerns on this form. It is a perspective view which shows a bonding part. It is a perspective view which shows the surface shape of the 1st roller in a bending|folding area. FIG. 10 is a perspective view showing the surface shape of the second roller in the bending section; FIG. 10 is a cross-sectional view showing a state in which an upright shape portion is formed in a bent section; It is a schematic diagram which shows the structure of a lamination|stacking part. FIG. 11 is a perspective view showing a modified example (part 1) of the shape of the cut for forming the standing shape portion; FIG. 11 is a perspective view showing a modified example (part 2) of the shape of the cut for forming the standing shape portion; It is a perspective view which shows the modification of an upright-shaped part.

Embodiments embodying the present invention will be described in detail below with reference to the accompanying drawings. This embodiment embodies the present invention as a battery 1 shown in FIG. 1 and a method for manufacturing the same. A battery 1 shown in FIG. 1 has an electrode laminate 2 housed in an exterior body 3 . The battery 1 is provided with positive and negative external terminals 4 and 5 . A feature of the present invention in this embodiment resides in the electrode laminate 2 . Therefore, the electrode laminate 2 will be described in detail.

FIG. 2 shows the electrode laminate 2 of the battery 1 of this embodiment. The electrode laminate 2 shown in FIG. 2 is obtained by stacking a large number of laminated plates 6 in a flat manner. FIG. 3 shows only the laminated plate 6 constituting the electrode laminate 2. As shown in FIG. The laminated plate 6 is in the shape of a substantially rectangular card. As will be described later, the laminated plate 6 is obtained by integrating a positive electrode plate, a negative electrode plate, and two layers of separators in advance into a card shape. The laminated plate 6 has a power storage section 7 , a positive collector section 8 , and a negative collector section 9 . The power storage unit 7 is a portion where all of the positive electrode plate, the negative electrode plate, and the two-layered separator exist. The positive electrode current collecting portion 8 is a portion where only the positive electrode plate exists. The negative current collecting portion 9 is a portion where only the negative electrode plate exists.

In the electrode laminate 2 of FIG. 2, of course, the power storage sections 7, the positive collector sections 8, and the negative collector sections 9 of the laminated plate 6 overlap each other when viewed from above. Viewing from above means viewing from a direction perpendicular to the laminated plate 6 . Each overlapping portion of the electrode laminate 2 is also referred to as a power storage unit 10, a positive current collector 11, and a negative current collector 12 hereinafter. In the battery 1 of FIG. 1, the positive current collector 11 is connected to the positive external terminal 4, and the negative current collector 12 is connected to the negative external terminal 5, respectively.

The laminated plate 6 in FIG. 3 will be further described. In the laminated plate 6 of the present embodiment, a notch 13 is formed in the negative electrode current collecting portion 9 and an upright shape portion 14 is formed in a part of the negative electrode current collecting portion 9 . The notch 13 is formed in the shape of a broken line toward the power storage unit 7 from the position of the end of the negative electrode current collector 9 away from the power storage unit 7 . However, the cut 13 does not enter the power storage unit 7 . A portion of the negative electrode collector portion 9 that is farther from the cutout 13 when viewed from the power storage portion 7 is bent upward in FIG. The incisions 13 and the standing shaped portions 14 are provided at the same positions in all the mating plates 6 with respect to the L direction in FIG.

FIG. 4 shows a front view of the negative electrode current collector 9 and its upright portion 14 in FIG. 3 as viewed from the line of arrow A in the figure. The standing shape portion 14 rises from the crease 40, and the rising angle θ may be within the range of 5° to 85°. If the rising angle θ is too small, there is no point in bending. If the rising angle .theta. That is, in the state of the electrode laminate 2 as shown in FIG. 2, the upright portions 14 of the respective laminated plates 6 are also overlapped with each other when viewed from above.

In the electrode laminate 2 shown in FIG. 2, the positioning accuracy between the matching plates 6 is high. This is because each mating plate 6 is formed with an upright shape portion 14 . First, the alignment accuracy in the W direction in FIG. 2 will be described. By pressing the end portion of the electrode laminate 2 on the side of the negative electrode current collector 12 against an appropriate alignment reference, the alignment plate 6 can be easily aligned in the W direction. A suitable alignment reference is, for example, the wall shown as "36" in FIG. 3 of the aforementioned US Pat.

Since the negative electrode current collecting portion 12 is a portion of each laminated plate 6 in which the positive electrode plate does not exist and only the negative electrode plate exists, it is fragile compared to the power storage portion 10 in which both the positive electrode plate and the negative electrode plate exist. can not deny. However, in this embodiment, since the above-described upright portion 14 is provided, the rigidity of the negative electrode current collecting portion 12 against the compressive load in the W direction is considerably high. Therefore, even if the negative electrode current collector 12 is pressed against the positioning reference, the negative electrode current collector 9 of each matching plate 6 is not wrinkled and deformed. Therefore, high alignment accuracy in the W direction can be obtained.

If alignment is performed without providing the upright shaped portion 14, wrinkling deformation 15 may occur in a portion of the negative electrode current collecting portion 9 as shown in FIG. There is a deviation D in the position of power storage unit 10 in the W direction between laminated plate 6 in which wrinkling deformation 15 has occurred and laminated plate 6 in which wrinkling deformation 15 has not occurred. Therefore, the alignment accuracy in the W direction is low. In this embodiment, by providing the standing shape portion 14, deterioration of positioning accuracy due to wrinkling deformation 15 is prevented.

In the above-described electrode laminate 2 of this embodiment, the upright shape portion 14 contributes to size reduction in the W direction in FIG. 2 in addition to the positioning accuracy described above. This is because, in the electrode laminate 2, the width of the negative current collecting portion 9 in the W direction itself can be smaller than when the upright portion 14 is not provided. For example, assume that the width of the negative electrode current collecting portion 9 is 15 mm, and there is a condition that the alignment accuracy is ±2 mm when the upright portion 14 is not provided. In this case, the positioning accuracy can be improved to about ±0.5 mm by forming the standing portion 14 under the conditions of width: 12 mm, length: 5 mm, and rising angle θ: 45°. This means that the width of the negative current collecting portion 9 itself can be reduced by 1.5 mm when the upright portion 14 is formed.

As for the L direction in FIG. 2, alignment is performed by pressing the end of the power storage unit 10 in the L direction against an appropriate alignment reference. Since power storage unit 10 has both a positive electrode plate and a negative electrode plate, it has considerable strength and is free from wrinkling deformation. Furthermore, in this embodiment, the fact that the upright portions 14 of the negative electrode current collecting portion 12 overlap each other when viewed from above also contributes to the alignment in the L direction. This is because the upright shape portion 14 is provided at the same position in any of the matching plates 6 as described above.

The upright shape portion 14 in the electrode laminate 2 shown in FIG. 2 is also a portion for connection with the negative electrode external terminal 5 shown in FIG. This connection structure will be described. FIG. 6 shows the state in which the negative terminal connecting member 16 is joined to the electrode laminate 2 . FIG. 6 shows a front view of the electrode laminate 2 to which the negative electrode terminal connecting member 16 is joined, viewed from the side of the negative current collector 12 (the line of sight is the same as the arrow A in FIG. 3). The negative electrode terminal connection member 16 is joined to the negative current collecting portion 12 of the electrode laminate 2 . More specifically, it is the location of the upright shape portion 14 in each negative electrode current collecting portion 9 .

As shown in FIG. 6, a flat portion 17 is provided in the vicinity of the tip of the upright portion 14 of each negative electrode current collector 9 . The flat portion 17 is parallel to the portion of the negative electrode collector portion 9 other than the upright portion 14 . In FIG. 6 , a plurality of flat portions 17 are overlapped with each other, and joint portions 18 between the negative electrode current collecting portion 9 and the negative electrode terminal connecting member 16 are provided there. Each flat portion 17 and the negative electrode terminal connecting member 16 are welded together at the joining portion 18 . Thus, the negative electrode terminal connecting member 16 is joined to the negative current collecting portion 12 of the electrode laminate 2 . Any joining method such as resistance welding, laser welding, or ultrasonic welding may be used. This joining step is performed after the step of laminating the laminated plates 6 together. The end of the negative terminal connecting member 16 that is not shown in FIG. 6 is connected to the negative external terminal 5 .

FIG. 7 shows a perspective view of the electrode laminate 2 to which the negative terminal connection member 16 is joined. As shown in FIG. 7, the negative electrode terminal connection member 16 is provided parallel to the edge of the negative current collector 12 from the joint 18 . At the tip, it is connected to a portion of the negative electrode pair external terminal 5 on the inner side of the exterior body 3 . In FIG. 7, the negative electrode terminal connection member 16 is depicted as being slightly lifted upward in the figure from the electrode laminate 2 . In terms of drawing, this gives priority to intuitive comprehension. Actually, as shown in FIG. 6, the negative electrode terminal connection member 16 is positioned at substantially the same height as the electrode laminate 2 . However, an arrangement as depicted in FIG. 7 is also possible.

In this embodiment, the negative electrode terminal connecting member 16 is joined to the upright portion 14 of the negative electrode collector 9 as described above. This fact itself also contributes to making the battery 1 compact. This is because there is no need to provide a special portion for joining the negative electrode terminal connection member 16 to the negative electrode current collecting portion 9 . In addition, since the width of the negative electrode current collecting portion 9 in the W direction is made compact as described above, the width T of the negative electrode terminal connection member 16 can also be made compact. In the battery 1 shown in FIG. 1, the connection between the positive electrode current collecting portion 11 and the positive electrode external terminal 4 is of course made by the terminal connecting member also on the positive electrode side. This connection method may be the same as the negative electrode side shown in FIGS. 6 and 7, or may be a known connection method.

Next, a method for manufacturing the battery 1 shown in FIG. 1 will be described. The manufacturing method of the battery 1 is basically to manufacture the electrode laminate 2 and house the manufactured electrode laminate 2 in the outer package 3 . Of these, the housing of the electrode laminate 2 in the exterior body 3 is not a feature of the present invention, and is not different from the known technique. A feature of the present invention in terms of manufacturing method is the manufacturing process of the electrode laminate 2 . That is, the feature of the present invention is that the electrode laminate 2 is manufactured by using the negative electrode plate in which the cut 13 and the upright portion 14 are formed.

The manufacturing process of the electrode laminate 2 will be described in detail with reference to FIG. FIG. 8 shows the process of obtaining the electrode laminate 2 from the positive electrode strip 19 and the negative electrode strip 20 . In FIG. 8, a first cutting section 21, a bonding section 22, a second cutting section 23, and a stacking section 24 are provided as facilities for carrying out this process.

The positive electrode strip 19 is an elongated strip formed by forming electrode active material layers on both sides of a collector foil. A non-coated portion 25 of only the current collector foil is provided at one end parallel to the longitudinal direction, and the remaining portion is a coated portion 26 having the electrode active material layer. A card-shaped positive electrode plate 27 is obtained by cutting the positive electrode band 19 in a direction crossing the longitudinal direction at the first cutting portion 21 .

The negative electrode strip 20 is also similar to the positive electrode strip 19 in that it is elongated and is formed by forming electrode active material layers on both sides of a collector foil. However, the material of the collector foil and the electrode active material layer naturally differs between positive and negative. The negative electrode strip 20 is also provided with a non-coated portion 28 of only the collector foil at one end parallel to its longitudinal direction, and the remaining portion is a coated portion 29 with an electrode active material layer. However, in the positive electrode strip 19 and the negative electrode strip 20, the non-coated portion 25 and the non-coated portion 28 are arranged in opposite directions. Both sides of the coated portion 29 of the negative electrode strip 20 are covered with a separator. The non-coated portion 25 is not covered with a separator. In addition, the above-mentioned negative electrode current collecting portion 12 is a portion consisting only of the negative electrode current collecting foil in which not only the positive electrode plate but also the negative electrode active material layer does not exist.

In the bonding portion 22, the negative electrode band 20 and the positive electrode plate 27 are bonded together. Here, the coated portion 26 and the coated portion 29 of the negative electrode strip 20 and the positive electrode plate 27 are overlapped with each other. Therefore, after bonding, the non-coated portion 25 of the positive electrode plate 27 and the non-coated portion 28 of the negative electrode band 20 protrude in opposite directions centering on the overlapped portion of the coated portion 26 and the coated portion 29. state. After bonding, the card-shaped positive electrode plate 27 is arranged on the elongated negative electrode strip 20 .

Then, the bonded negative electrode strip 20 is cut at the second cutting portion 23 . The cutting direction is also the direction crossing the longitudinal direction, and the cutting point is the gap between the positive electrode plates 27 . Thereby, the laminated plate 6 is obtained. In the laminated plate 6, the positive electrode plate 27, the negative electrode plate, and the separator are integrated in a card shape, and only the positive electrode plate 27 and the power storage section 7, in which all the positive electrode plate 27, the negative electrode plate, and the separator exist. It has a positive current collector 8 and a negative current collector 9 in which only the negative plate is present. The electrode laminate 2 is obtained by laminating a plurality of the laminated plates 6 in the lamination portion 24 . In the laminated portion 24, the laminated plates 6 are laminated such that the power storage portions 7, the positive electrode current collectors 8, and the negative electrode current collectors 9 overlap each other from above.

Here, when the negative electrode strip 20 and the positive electrode plate 27 are bonded together at the bonding portion 22, the upright shape portion 14 is also formed. As shown in FIG. 9, the bonding section 22 is composed of a roller pair of a first roller 30 and a second roller 31 . The roller pair in FIG. 9 is provided with a bonding section 32 and a folding section 34 . The bonding section 32 is a section through which the coating portion 26 and the coating portion 29 pass. Both the first roller 30 and the second roller 31 in the bonding section 32 have a simple cylindrical shape.

The bending section 34 is a section through which the non-coated portion 28 of the negative electrode strip 20 passes. When the uncoated portion 28 passes through the folding section 34, the formation of the incision 13 and the raised profile 14 takes place. Therefore, the first roller 30 and the second roller 31 in the bending section 34 have a special shape that is not a simple columnar shape (indicated by "F" in FIG. 9).

FIG. 10 shows the surface shape of the first roller 30 in the bending section 34. As shown in FIG. As shown in FIG. 10 , in the bending section 34 , a cutting edge 37 and bending protrusions 38 are formed on the surface of the first roller 30 . The portion other than the cutting edge 37 and the bending protrusion 38 is a simple cylindrical surface. The cutting edge 37 has a shape for making a cut 13 in the non-coated portion 28 . Therefore, the cutting blade 37 is formed in a polygonal line shape from the position of the end portion of the bent section 34 away from the bonded section 32 toward the bonded section 32 . However, the cutting blade 37 has not entered the bonding section 32 . A bending projection 38 is formed linearly from the innermost portion of the cutting blade 37 to the end in the direction opposite to the bonding section 32 .

Further, as shown in FIG. 11, a folding pad 39 is formed on the second roller 31 in the folding section 34 . The bending pad 39 is formed linearly over substantially the same length as the bending projection 38 from the end of the bending section 34 away from the bonding section 32 . The material of the bending pad 39 is softer than the bending protrusion 38, such as rubber. The folding pad 39 is provided at a position where it always comes into contact with the folding protrusion 38 when the first roller 30 and the second roller 31 are rotated.

Therefore, when the negative electrode strip 20 and the positive electrode plate 27 pass through the bonded portion 22 , the cutting edge 37 makes a cut 13 in the non-coated portion 28 . Then, as shown in FIG. 12, part of the non-coated portion 28 is sandwiched between the bending projection 38 and the bending pad 39 . In this way, the sandwiched portion of the non-coated portion 28 is folded to form a crease 40 . The crease 40 is a linear portion of the non-coated portion 28 extending from the innermost portion of the cut 13 to the end portion. As a result, the portion ahead of the crease 40 is lifted up to form the standing shape portion 14 . A part of the non-coated portion 28 that is farther from the notch 13 than the coated portion 29 becomes the upright portion 14 .

The bending pad 39 in FIG. 12 is pressed by the bending protrusion 38 and has a shape distorted from its original shape. By setting the degree of distortion of the bending pad 39, the rising angle .theta. shown in FIG. 4 can be adjusted. That is, if the bending pad 39 is set to have a large degree of distortion during bending, the standing shape portion 14 having a large rising angle θ can be obtained. If the degree of distortion of the bending pad 39 at the time of bending is set to be small, the standing shaped portion 14 with a small rising angle θ can be obtained. As a result, the rising angle θ can be set within the preferable range described above.

The circumferential lengths of the first roller 30 and the second roller 31 are the same as the arrangement pitch in the L direction of the laminated plates 6 on the negative electrode strip 20 on the downstream side of the laminated portion 22 in FIG. As a result, the standing shaped portions 14 are formed at the same position on each of the matching plates 6 .

FIG. 13 shows a configuration example of the laminated portion 24. As shown in FIG. The stacking unit 24 is provided with a stacking table 41 and a rotary table 42 . Two suction pads 43 are provided on the rotary table 42 . Both of the two suction pads 43 are movable up and down with respect to the rotary table 42 . Thereby, the laminated plate 6 can be stacked on the stacking table 41 .

That is, the laminated plate 6 obtained by cutting at the second cutting portion 23 is sucked and lifted by one suction pad 43 . Then, after rotating the rotary table 42 by 180°, the laminated plate 6 is placed on the stacking table 41 . By repeating this, the electrode laminate 2 is obtained on the lamination table 41 . Of course, the lifting function of the suction pad 43 is used for lifting and placing the laminated plate 6 . Therefore, the moving direction of the laminated plate 6 placed on the stacking table 41 is the vertical direction. Therefore, since the erected portions 14 are overlapped when viewed from above, the erected portions 14 do not become a hindrance. Further, on the stacking table 41, as described above, the alignment plates 6 can be aligned with each other using a suitable alignment reference.

In this way, the electrode laminate 2 in which the rigidity of the negative electrode current collecting portion 12 is considerably high due to the upright shape portion 14 is obtained. After that, by carrying out the respective steps of attaching the negative electrode terminal connecting member 16, attaching the positive electrode terminal connecting member, and housing in the exterior body 3, the battery 1 shown in FIG. 1 is obtained. Both the attachment of the positive and negative terminal connection members and the housing itself in the exterior body 3 may be performed by known methods. Moreover, the exterior body 3 naturally accommodates not only the electrode laminate 2 but also a known electrolytic solution.

Next, a modified example of this embodiment will be described. All of the modified examples described here relate to the specific shape of the standing shape portion 14 . In the description so far, the shape of the notch 13 for forming the standing shape portion 14 in the negative electrode current collecting portion 9 was a polygonal line shape as shown in FIG. However, it is not limited to this, and may be curved as shown in FIG. 14 or may be oblique as shown in FIG. Also, even in the case of a polygonal line, the angle of each section of the polygonal line may not be as illustrated. Also, the fold line 40 may be curved with an unclear line. In the case of a curved shape, the rise angle θ may be the inclination angle of the planar portion on the tip side of the curved portion.

In addition, as shown in FIG. 16, a shape in which the cut 13 does not reach the end of the negative electrode current collector 9 is also conceivable. In this case, a step of pressing the negative electrode current collecting portion 9 (non-coated portion 28) separately from the formation of the cut 13 is required after that. However, the effect of improving the rigidity of the negative electrode current collector 9 can be obtained. Although it is conceivable to eliminate the notch 13 itself in FIG. 16 and use only press working, it is somewhat disadvantageous in that distortion tends to remain in the negative electrode current collecting portion 9 . Conversely, the presence of the notch 13 prevents the negative electrode current collecting portion 9 from being distorted even when the upright portion 14 is formed.

As described in detail above, according to the present embodiment, by providing the upright shape portion 14 in a part of the current collecting portion (non-coated portion) of the electrode plate constituting the electrode laminate 2, the current collecting portion It improves the rigidity of As a result, a method of manufacturing a battery with excellent alignment accuracy of the electrode plates constituting the electrode laminate 2 and a battery 1 manufactured by the method have been realized. In addition, it is possible to contribute to making the size of the electrode laminate 2 compact.

It should be noted that the present embodiment is merely an example, and does not limit the present invention in any way. Therefore, the present invention can naturally be improved and modified in various ways without departing from the scope of the invention. For example, in the above embodiment, the upright shape portion 14 is provided in the negative electrode current collecting portion 9 . However, without being limited to this, the upright shape portion 14 may be provided in the positive electrode collector portion 8 . However, with respect to which current collecting portion the upright shape portion 14 is provided, all the laminated plates 6 constituting the electrode laminate 2 must be the same. Alternatively, both the negative electrode current collector 9 and the positive electrode current collector 8 may be provided with the upright shape portion 14 . However, in this case, the upright shaped portions 14 must be provided in both current collecting portions of all the laminated plates 6 constituting the electrode laminate 2 . Moreover, the number of standing shape portions 14 in one laminated plate 6 is arbitrary. However, the number of them must also be uniform in the electrode laminate 2 .

Moreover, the type of battery to which the present invention is applied does not matter. However, it is only necessary to have a structure in which an electrode laminate formed by stacking a positive electrode plate, a negative electrode plate, and a separator is housed in an outer package. Lithium-ion batteries, nickel-metal hydride batteries, and all-solid-state batteries are all included within the scope of batteries to which the present invention can be applied. Moreover, although the positive electrode plate and the negative electrode plate are formed by forming an electrode active material layer on the surface of the collector foil, this is also not essential. Depending on the type of battery, there may be no distinction between the collector foil and the electrode active material layer.

The manufacturing procedure may also differ from that shown in FIG. For example, a system in which the negative electrode strip is first cut into a card shape and placed on the positive electrode strip may be employed, or a system in which both the positive electrode plate and the negative electrode plate are formed into card shapes in advance and then laminated one by one to obtain the laminated plate 6. It's okay. The rotary table 42 in FIG. 13 may be replaced with a linear reciprocating type.

[Appendix]
A method for manufacturing a battery by housing an electrode laminate formed by stacking a positive electrode plate, a negative electrode plate, and a separator in an outer package, comprising:
A positive electrode plate, a negative electrode plate, and a separator are integrated in advance in a card shape, and a power storage unit in which all of the positive electrode plate, the negative electrode plate, and the separator exist, a positive electrode current collector in which only the positive electrode plate exists, and a negative electrode plate. Using a laminated plate having a negative electrode current collector where only
The electrode laminate is manufactured by a lamination step of laminating the laminated plates so that the power storage units, the positive electrode current collectors, and the negative electrode current collectors overlap each other, and the laminated plates are subjected to the lamination step. As the laminated plate, at least one of the positive electrode current collecting portion and the negative electrode current collecting portion which is aligned is formed with an upright portion which is raised with respect to the other portion by partial bending or bending. use,
A method of manufacturing a battery, wherein in the stacking step, the standing shape portions are overlapped with each other.
A method for manufacturing the aforementioned battery,
As the laminated plate used in the laminating step, at least one of the positive electrode current collecting portion and the negative electrode current collecting portion is notched, and a portion farther from the notch as viewed from the electricity storage portion is raised. A method of manufacturing a battery, characterized by using a shape portion.
A method for manufacturing the aforementioned battery,
The laminated plate used in the laminating step is characterized in that the cut is formed in a polygonal line, curved line, or oblique line in a direction from an end position away from the power storage unit toward the power storage unit. A method of manufacturing a battery to
A battery in which an electrode laminate obtained by stacking a positive electrode plate, a negative electrode plate and a separator is housed in an outer package,
Each of the electrode laminates has a card-shaped positive electrode plate and a negative electrode plate laminated with a separator interposed therebetween, and an electric storage unit in which all of the positive electrode plate, the negative electrode plate, and the separator exist, and only the positive electrode plate. has a positive current collector where only the negative plate exists and a negative current collector where only the negative plate exists,
At least one of each of the positive electrode plates of the positive electrode current collecting portion and each of the negative electrode plates of the negative electrode current collecting portion is partially bent or curved to form an upright portion that is raised with respect to the other portions. with
The standing shape portions overlap each other,
A battery, wherein a terminal connection member connected to an external terminal is joined to the overlapping portion of the standing shape portions.

1 Battery 2 Electrode laminate 3 Exterior body 4 Positive electrode external terminal 5 Negative electrode external terminal 6 Laminated plates 7, 10 Power storage units 8, 11 Positive electrode current collectors 9, 12 Negative electrode current collector 13 Cut 14 Upright shape portion 16 Negative terminal connecting member 18 Joint 27 Positive electrode plate

Claims (5)

A method for manufacturing a battery by housing an electrode laminate formed by stacking a positive electrode plate, a negative electrode plate, and a separator in an outer package, comprising:
A positive electrode plate, a negative electrode plate, and a separator are integrated in advance in a card shape, and a power storage unit in which all of the positive electrode plate, the negative electrode plate, and the separator exist, a positive electrode current collector in which only the positive electrode plate exists, and a negative electrode plate. A laminated plate manufacturing step of manufacturing a laminated plate having a negative electrode current collector in which only the
laminating the laminated plates so that the power storage units, the positive current collectors, and the negative current collectors overlap each other when viewed from above to form the electrode laminate;
At least one of the positive electrode current collecting portion and the negative electrode current collecting portion in each of the laminated plates which is aligned during the manufacturing process of the laminated plate is partially bent or bent to stand up against the other portion. Performing an upright shape forming process for forming a shape part,
A method of manufacturing a battery, wherein in the stacking step, the upright portions are overlapped with each other when viewed from above. A method for manufacturing the battery according to claim 1,
A method of manufacturing a battery, characterized in that, after the stacking step, a terminal joining step of joining a terminal connecting member for connection with an external terminal to the overlapping portions of the upright portions is performed. A method for manufacturing the battery according to claim 1 and claim 2,
In the standing shape forming step, at least one of the positive current collecting portion and the negative current collecting portion in each of the laminated plates is cut, and a portion farther from the cut when viewed from the power storage portion is cut. A method for manufacturing a battery, characterized by forming an upright shape portion. A method for manufacturing the battery according to claim 3,
A method of manufacturing a battery, wherein in the standing shape forming step, the notch is formed in a polygonal, curved, or oblique line from an end position away from the power storage unit toward the power storage unit. A battery in which an electrode laminate obtained by stacking a positive electrode plate, a negative electrode plate and a separator is housed in an outer package,
The electrode laminate includes a positive electrode plate and a negative electrode plate, both of which are in the form of a card and which are obtained by forming electrode active material layers on both sides of a current collector foil, and is laminated with a separator interposed therebetween. A power storage part where all of the negative plate and the separator exist, a positive current collector part where only the collector foil on the positive plate is uncoated, and only a non-coated part on the negative plate where only the current collector foil exists. and a negative current collecting portion projecting from the positive electrode current collecting portion and the negative electrode current collecting portion in opposite directions from the power storage portion ,
At least one of each of the positive electrode plates of the positive electrode current collecting portion and each of the negative electrode plates of the negative electrode current collecting portion is partially bent or curved to form an upright portion that is raised with respect to the other portions. with
The standing shape portions are arranged to overlap each other when viewed from above,
A battery, wherein a terminal connection member connected to an external terminal is joined to the overlapping portion of the upright shape portions.

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