JP2004179050A - Square battery and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a square battery processed for insulation without using a separate insulating means to insulate between a positive and a negative electrode plates forming a plate group and a battery case. <P>SOLUTION: When the plate group 14 provided with a separator 49 having a width dimension larger than that of the positive and the negative electrode plates and larger than that of a recessed part is inserted into a main body case 11 formed with a joint part in an opening part of a half-shell body thereof, an edge of the separator 49 projected from the positive and the negative electrode plates is bent toward the downstream side in the inserting direction to cover the ends of the positive and the negative electrode plates, and insulation treatment can be thereby performed without arranging an insulating member. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a flat rectangular battery in which a power generation element is housed in a battery case in which an opening of a main body case formed in a half-shell body is sealed by a lid plate, and a method for manufacturing the same.
[0002]
[Prior art]
Mobile electronic devices, such as mobile phones and PDAs, have been significantly reduced in size and thickness as well as becoming more sophisticated. Batteries applied to them have been required to be smaller, thinner and have higher energy densities. Flat lithium ion secondary batteries are widely used. The battery case applied to this flat rectangular battery is constituted by a battery can formed in a square cylindrical shape with a bottom by deep drawing, and a sealing plate closing an opening end thereof. A power generation element made of an electrolyte is accommodated.
[0003]
In order to reduce the thickness of the battery, it is necessary to deep-draw the battery can into a rectangular tube having a smaller width.However, as the opening area becomes smaller with respect to the depth in the processing direction, the processing becomes more difficult. There is a limit to how thin the battery can can be by drawing. Also, it becomes more difficult to insert the electrode plate group into a battery can formed in a narrow, deep cylindrical shape as the thickness becomes smaller and the opening area becomes smaller.
[0004]
Therefore, it is necessary to change the structure of the battery case in order to further reduce the thickness of the rectangular battery whose thickness is limited, and close the main body case formed in the half shell and the opening of the main body case. A battery in which a battery case is formed by a flat plate or a half-shell lid plate has been developed.
[0005]
For example, as shown in FIG. 15, there is known a prismatic battery in which an electrode group 3 is accommodated in an upper cup 1 and an opening thereof is sealed by a lower cup 2 (see Patent Document 1). In this battery case structure, the recess for accommodating the power generation element can be formed by shallow drawing, so that the battery case can be easily manufactured.
[0006]
When accommodating the electrode plate group in the battery case, it is necessary to insulate the positive electrode plate or the negative electrode plate constituting the electrode plate group so as not to contact the battery case. Then, an insulating process for arranging an insulating plate is performed. However, the number of work steps increases due to the insulation treatment, and the production cost also increases. In a prismatic battery using a conventional cylindrical battery can, a method of covering an edge of an electrode plate with a separator constituting an electrode group has been disclosed (see Patent Document 2).
[0007]
As shown in FIG. 16, when the electrode group 9 wound with the width of the separator constituting the electrode group 9 larger than that of the positive electrode plate and the negative electrode plate is inserted into the battery can 8, the separator protruding from the positive and negative electrode plates is obtained. Are bent to cover the edges of the positive and negative electrode plates, thereby enabling insulation between the positive and negative electrode plates and the battery can 8 without providing the above-described insulation treatment.
[0008]
[Patent Document 1]
JP 2001-250517 A (pages 2 to 4, FIG. 1)
[0009]
[Patent Document 2]
Japanese Patent No. 2697565 (pages 1-2, FIG. 2)
[0010]
[Problems to be solved by the invention]
However, the configuration in which the separator covers the edges of the positive and negative electrodes with the separator in the above-described conventional technology is that the separator bends so as to cover the edges of the positive and negative electrodes when the electrode group is inserted into the cylindrical battery can. Since the separator is thin and soft, it cannot be expected to bend in a direction covering the edges of the positive and negative electrode plates, and there is a problem that a reliable insulating state cannot be obtained.
[0011]
In the configuration in which the battery case is not a cylindrical battery can and uses the main body case formed in a half-shell as described above, the width of the separator is larger than the width of the positive and negative electrode plates, and larger than the recess width of the main body case. When the formed electrode plate group is inserted into the main body case, the edge of the separator bends downstream in the insertion direction, so that the edges of the positive and negative electrode plates are securely covered, and the positive and negative electrode plates can be connected without performing insulation treatment. The battery case and the battery case can be insulated by the separator.
[0012]
However, as shown in FIG. 17, there is a possibility that the upper layer separator 49 may be placed on the flange portion 13 for closing the opening of the main body case 11 with the cover plate 12, and the separator 49 may be placed on the flange portion 13. When the lid plate 12 is welded to the flange portion 13, the separator 49 intervenes at the welded portion, which may cause poor welding and impair the hermeticity in the battery case.
[0013]
An object of the present invention is to provide a prismatic battery provided with an insulating structure of an electrode group suitable for a prismatic battery using a battery case having a structure in which a half-shell case is closed with a lid plate, and a method of manufacturing the same. is there.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an electrode in which a positive electrode plate and a negative electrode plate are flatly wound via a separator in a concave portion of a main body case in which a joint is formed at an opening of a square half-shell. A rectangular battery in which a plate group is housed, a concave portion of the main body case is closed, a lid plate placed on the joint portion is welded to the joint portion, and the inside of the concave portion is sealed, and the electrode plate group is The width of the positive electrode plate and the negative electrode plate in a direction orthogonal to the winding direction is smaller than the inner width of the concave portion, and the separator is formed to be larger than the inner width of the concave portion. There are various types of the joining portion, such as a fitting portion having a step in the opening, and a joining portion having a flange around the periphery is preferable.
[0015]
According to the above configuration, when the electrode plate group is inserted into the concave portion, the edge of the separator formed to be larger than the inner width of the concave portion is bent to the downstream side in the insertion direction of the electrode plate group. Is covered at the end of the bent separator, and an internal short circuit caused by the positive and negative electrode plates coming into contact with the main body case can be prevented. Therefore, the insulating means is constituted by the electrode plate group itself without using a separate insulating member.
[0016]
In the above configuration, the cover plate forms a recess toward the inside of the recess by using a position at a predetermined distance from the inner circumferential wall of the recess of the main body case as an outer circumferential wall, thereby forming a space between the outer circumferential wall of the recess and the inner circumferential wall of the recess. Is formed, and when an upper separator that is bent and protrudes from the concave portion is accommodated in this space, the edge of the separator is not placed on the flange portion and does not hinder welding to the lid plate. The predetermined distance is different depending on a component configuration such as a case in which the frame is inserted. However, it is preferable that the predetermined distance is 0.5 mm from the height of the protruding separator from the viewpoint of accommodating the separator. Is preferred.
[0017]
In addition, a recess is formed in the cover plate toward the inside of the recess as a position at a predetermined distance from the inner circumferential wall of the recess of the main body case as an outer circumferential wall, and the outer dimension is between the outer circumferential wall of the recess and the inner circumferential wall of the recess. By inserting an insulating frame formed to be smaller than the inner width of the recess and larger than the width of the positive electrode plate and the negative electrode, the upper separator bent when the electrode plate group is inserted into the main body case. Can be held down by the frame, so that it is possible to prevent the edge of the upper layer separator from being placed on the flange portion and being sandwiched between the lid plate and an obstacle to welding.
[0018]
Further, the second invention of the present application provides an electrode plate group in which a positive electrode plate and a negative electrode plate are flatly wound via a separator in a concave portion of a main body case in which a joint is formed at an opening of a square half-shell. In the method for manufacturing a prismatic battery that accommodates and closes the concave portion of the main body case and seals the inside of the concave portion by welding the lid plate placed on the joint portion to the joint portion, the electrode group may be wound in the winding direction. The width in the direction perpendicular to the width of the positive electrode plate and the negative electrode plate is smaller than the width of the inside of the recess, and the separator is formed to be larger than the width of the inside of the recess. Is bent downstream in the insertion direction, and is interposed between the end of the positive electrode plate and / or the negative electrode plate and the inner peripheral wall of the concave portion.
[0019]
According to the above manufacturing method, when the electrode plate group is inserted into the concave portion, the edge of the separator formed to be larger than the inner width of the concave portion is bent downstream in the insertion direction of the electrode plate group. The portion is covered with the end of the bent separator, and an internal short circuit caused by the positive and negative electrode plates contacting the main body case can be prevented. Therefore, the positive and negative electrode plates can be insulated by the electrode plate group itself without using a separate insulating member.
[0020]
In the above manufacturing method, at the time of inserting the electrode plate group into the concave portion, a portion where the resin film is inserted between at least the side surface orthogonal to the winding direction of the electrode plate group and the inner wall of the concave portion, and protrudes outside the concave portion of the resin film Is heated and softened, and bent and formed on the electrode group together with the bent separator edges, so that in addition to the bent separator edges, a resin film is applied between the positive and negative electrode edges and the main body case. Insulation of the upper electrode separator can be suppressed by the resin film that is bent at the edge of the upper layer separator that is bent when the electrode group is inserted into the main body case. It can be prevented from being placed on the lid and being sandwiched between the lid plate and an obstacle to welding.
[0021]
By applying a material having a softening temperature lower than the melting temperature of the separator, the resin film can be heated and shaped without melting the separator.
[0022]
Further, the third invention of the present application is directed to an electrode plate group in which a positive electrode plate and a negative electrode plate are flatly wound via a separator in the concave portion of the main body case in which the joining portion is formed in the opening of the square half-shell. In the method for manufacturing a rectangular battery in which the concave portion of the main body case is closed, the lid plate placed on the joint portion is welded to the joint portion to seal the inside of the concave portion, The width in the direction orthogonal to the direction, the positive electrode plate and the negative electrode plate are smaller than the inner width of the recess, the separator is formed larger than the inner width of the recess, the outer dimensions are smaller than the inner wall width of the recess, the inner dimensions are the positive electrode plate and By inserting the electrode plate group into the recess through an insertion jig formed in a frame shape larger than the width of the negative electrode plate, the insertion jig bends the end side of the separator to the downstream side in the insertion direction to make the electrode The plate group is inserted into the recess.
[0023]
According to the above-described manufacturing method, when the electrode plate group is inserted into the recess through the insertion jig, the edge of the separator is shaped by the insertion jig into a state of being bent downstream in the insertion direction of the electrode plate group, and is inserted into the recess. Inserted. Since the separator is thin and soft, it may not be bent in a certain direction depending on the contact state when directly inserted into the recess, but it is ensured that the separator is bent downstream in the passing direction by passing through the insertion jig. available. The ends of the positive and negative electrode plates are covered with the ends of the bent separator, so that an internal short circuit caused by the positive and negative electrode plates coming into contact with the main body case can be prevented. Therefore, the positive and negative electrode plates can be insulated by the electrode plate group itself without using a separate insulating member.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.
[0025]
FIG. 1 shows the external shape of a prismatic battery according to the present embodiment, which is configured as a lithium ion secondary battery. This prismatic battery includes a battery main body 20 shown in FIG. 2 and an exterior body 30 that covers the battery main body 20.
[0026]
As shown in FIG. 3, the battery body 10 includes a main body case 11 formed in a half-shell body and a lid plate 12 that closes an open portion of the battery case 10. The electrode group 14 is accommodated in the concave portion 15 of the main body case 11, and the periphery of the cover plate 12 is welded to the flange portion 13 formed on the main body case 11 to seal the opening of the main body case 11 with the cover plate 12. It is configured as follows.
[0027]
The main body case 11 is formed by pressing an iron-based plate material such as stainless steel or a cold-rolled steel plate to provide a stepped portion 16 having a reduced drawing depth at one end side to form a recessed portion 15 and to form a recessed portion 15 around the recessed portion 15. It is formed by providing a flange portion 13. The step portion 16 is a portion where external connection terminals for the positive electrode and the negative electrode are formed. In this case, the lower gasket 18 insulates the terminal hole 17 formed in the step portion 16 from the main body case 11 and secures airtightness with the rivet 19. Thus, the PTC unit 26 is fixed on the outer surface of the step 16.
[0028]
As shown in FIG. 4, the PTC unit 26 accommodates a PTC element 33 in which an upper electrode 33b and a lower electrode 33c are joined to both surfaces of a PTC conductive polymer 33a in a PTC holder 34, and a step portion by an upper gasket 35. The rivet 19 is fixed to the step 16 by fastening the rivet 19 via a washer 37 while being insulated from the holder 16, and the holder plate 36 is welded to the opening of the PTC holder 34. Here, the holder plate 36 constitutes a positive electrode external connection terminal. Note that the PTC (Positive Temperature Coefficient) element 33 is a device whose temperature rises due to overcurrent or overheating and whose resistance value rises rapidly when the element temperature reaches a predetermined temperature. The power loss is kept low, and when the temperature reaches a predetermined temperature, the resistance value rises sharply from the fourth power to the sixth power. Therefore, when an external short circuit occurs, the temperature rises to suppress the short circuit current, and the battery is removed from the external short circuit. Protect.
[0029]
An electrode group 14 in which a positive electrode plate 47 and a negative electrode plate 48 are flatly wound via a separator 49 is accommodated in the concave portion 15 of the main body case 11. As shown in FIG. 5, the electrode plate group 14 is wound so that the outermost periphery becomes the negative electrode plate 48, the winding direction is from the step portion 16 to the opposite side, and the winding end end is The positive electrode lead 21 and the negative electrode lead 22 are pulled out from the winding end of each of the positive electrode plate 47 and the negative electrode plate 48 so as to be on the step 16 side. The positive electrode lead 21 is formed such that the extended portion from the winding end of the positive electrode plate 47 is positioned at a position on the extended line of the rivet 19 attached on the step 16 with a width appropriate for a lead. Is formed by cutting so that the tip portion has a length positioned on the rivet 19 when stored in the rivet 19. Further, the negative electrode lead 22 has an appropriate width as a lead at an appropriate position as an extension from an end of the winding of the negative electrode plate 48 at an arbitrary position on the stepped portion 16 where a member such as the rivet 19 does not exist. When the plate group 14 is housed in the concave portion 15, it is formed by cutting so that the front end portion has a length positioned on the step portion 16.
[0030]
As shown in FIG. 6, the width of the separator 49 in the direction orthogonal to the winding direction is formed larger than the width of the positive electrode plate 47 and the negative electrode plate 48 and larger than the width of the recess 15.
[0031]
As shown in FIG. 7, the electrode plate group 14 having the above-described configuration is configured such that the side from which the positive electrode lead 21 and the negative electrode lead 22 are drawn out into the concave portion 15 of the main body case 11 is the stepped portion 16 side and the winding end end. Is stored outside. At this time, the end of the separator 49 protruding from the side surface of the electrode group 14 in a direction perpendicular to the winding direction is located downstream of the electrode group 14 in the insertion direction into the recess 15 as shown in FIG. Since the separator 49 is bent, the bent separator 49 serves as an insulating means for preventing the positive electrode plate 47 from contacting the main body case 11 at the negative potential.
[0032]
However, since the separator 49 is thin and soft, it is not clear what direction the edge is bent depending on the contact state when the electrode group 14 is inserted into the main body case 11. Therefore, when inserting the electrode plate group 14 into the concave portion 15 of the main body case 11, it is necessary to shape or carefully insert the separator plate 49 in advance so that the edges of the separator 49 are bent to the downstream side in the insertion direction. As a result, the workability of battery production is reduced. Therefore, when inserting the electrode plate group 14 into the main body case 11, the insertion jig is used as shown in FIG. It is preferable to insert the electrode plate group 14 into the main body case 11 using 52.
[0033]
10, the width of the insertion jig 52 in the direction orthogonal to the winding direction of the electrode group 14 is larger than the width of the positive and negative electrodes 47, 48 of the electrode group 14, as shown in FIG. It is formed in a frame shape whose outer dimensions are smaller than the width of the recess 15. As shown in FIG. 9, when the electrode plate group 14 is inserted into the recess 15 through the insertion jig 52, the edges of the separator 49 are bent to the downstream side in the insertion direction when passing through the insertion jig 52. And is inserted into the recess 15 as it is.
[0034]
When the electrode group 14 is housed in the concave portion 15, if the winding end end is outward, as shown in FIG. 7, the tip of the positive electrode lead 21 is slightly higher than the step 16, and Since the tip portion of the negative electrode lead 22 is located on the step 16, the positive electrode lead 21 is joined to the rivet 19 and the negative electrode lead 22 is joined to the step 16 without leading the lead. Can be.
[0035]
In the opening of the main body case 11 in which the electrode plate group 14 is accommodated, the cover plate 12 is placed on the flange portion 13, and the flange portion 13 and the cover plate 12 are positioned so that their outer edges coincide. The lid is sealed by welding between the peripheral portion of the cover plate 12 and the flange portion 13.
[0036]
As shown in FIG. 3, a shallow depression 23 is formed in the center of the cover plate 12 so that when the battery case 10 swells due to the expansion of the electrode group 14 or an increase in the internal pressure, the swelling is reduced. Is absorbed within the formation depth, so that no change occurs in the overall thickness of the prismatic battery.
[0037]
Further, as shown in FIG. 8, since the recess 23 formed in the cover plate 12 is formed at a predetermined interval from the inner wall of the recess of the main body case 11, the gap between the outer wall of the recess 23 and the inner wall of the recess 15 is formed. Is a space for accommodating the upper layer separator 49 that is bent when the electrode plate group 14 is inserted into the main body case 11. If the lid plate 12 is placed on the flange portion 13 and welded without the accommodating space for the bent separator 49, the separator 49 may be sandwiched between the lid plate 12 and the flange portion 13 to perform welding. However, lack of tightness due to poor welding occurs, but since the storage space for the separator 49 is formed, the protruding upper layer separator 49 is stored in the storage space.
[0038]
When the electrode plate group 14 is inserted into the main body case 11, a frame 50 as shown in FIG. It can be configured to be placed on the electrode plate group 14 housed in the main body case 11 and to hold the upper separator 49. When the recess 15 of the main body case 11 is closed by the cover plate 12, the frame body 50 is formed between the outer peripheral wall of the recess 23 formed in the cover plate 12 and the inner peripheral wall of the recess 15 as shown in FIG. The folded separator 49 is housed in the housing space and presses the edges of the upper layer separator 49 inward, so that the bent separator 49 is not placed on the flange portion 13 to cause poor welding.
[0039]
When inserting the electrode plate group 14 into the main body case 11, as shown in FIG. 13A, a resin sheet 51 is inserted between the electrode plate group 14 and the inner wall of the concave portion 15, and as shown in FIG. As shown in ()), the resin sheet 51 may be softened by heating and bent inward, and the edge of the separator 49 may be fixed on the electrode plate group 14. By setting the softening temperature of the resin sheet 51 higher than the melting temperature of the separator 49, the separator 49 is not melted by heating. Here, the resin sheet 51 is porous with an appropriate opening due to impregnation of the electrode group 14 with the electrolytic solution. In order to enhance the impregnation property, the resin sheet 51 may be formed into a shape having excellent liquid permeability such as a mesh shape, or a method of covering only a part of the side surface of the group and not covering the entire surface. There is.
[0040]
A predetermined amount of electrolyte is injected from an electrolyte injection port 28 formed in the step portion 16 into the concave portion 15 in which the electrode plate group 14 is accommodated and sealed by welding the lid plate 12, and the injection is completed. Thereafter, a plug 29 is inserted into the electrolyte inlet 28 and the inside of the concave portion 15 is sealed by welding the plug 29 to the step portion 16.
[0041]
As shown in FIG. 14, the battery body 20 formed as described above is covered with a resin cover 25 formed by resin molding, and a resin film 38 is wound thereon to form the rectangular battery shown in FIG. Formed. The resin cover 25 has a positive terminal window 31 opening on the holder plate 36 of the PTC unit 26 fixed on the outer surface of the step 16, and a portion on the bottom surface of the main body case 11 where the step 16 is not formed. An opening is formed between the positive electrode terminal window 31 and the negative electrode terminal window 32 so that the resin film 38 is not wound around the positive electrode terminal window 31 and the negative electrode terminal window 32. Since the holder plate 36 serving as an external connection terminal is externally exposed, and the main body case 11 serving as a negative electrode external connection terminal is externally exposed from the negative electrode terminal window 32, it can be used for external connection.
[0042]
【The invention's effect】
As described above, according to the present invention, when the electrode plate group is housed in the concave portion of the main body case formed in the half shell, the separator formed wider than the positive and negative electrode plates is bent and the ends of the positive and negative electrode plates are bent. Since the portion is covered, an insulating means for preventing an internal short circuit without separately providing an insulating means is configured.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the external shape of a prismatic battery according to an embodiment.
FIG. 2 is a perspective view showing an external shape of a battery body constituting the prismatic battery.
FIG. 3 is an exploded perspective view showing a configuration of a battery main body.
FIG. 4 is a sectional view showing a configuration of a PTC unit.
FIG. 5 is a perspective view showing a lead lead-out structure.
FIG. 6 is a partial cross-sectional view showing a configuration of an electrode plate group.
FIG. 7 is a perspective view showing a state where the electrode plate group is stored in the main body case.
FIG. 8 is a partial sectional view showing a bent state of the separator.
FIG. 9 is a schematic view showing a method of inserting an electrode plate group using an insertion jig.
FIG. 10 is a perspective view showing a configuration of an insertion jig.
FIG. 11 is a perspective view showing the configuration of a frame.
FIG. 12 is a sectional view showing a structure for pressing a separator by a frame.
FIG. 13 is a partial sectional view showing a shaping structure of a separator by a resin film.
FIG. 14 is a perspective view showing formation of an exterior body with respect to a battery main body.
FIG. 15 is an exploded perspective view showing a configuration of a prismatic battery according to the related art.
FIG. 16 is a perspective view showing an insulating structure using a separator according to the related art.
FIG. 17 is a partial cross-sectional view illustrating a problem of an insulating structure formed by a separator edge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Battery case 11 Main body case 12 Cover plate 13 Flange part 14 Electrode group 15 Recess 16 Step part 47 Positive electrode plate 48 Negative electrode plate 49 Separator 50 Frame body 51 Resin sheet 52 Inserting jig

Claims (7)

An electrode plate group in which a positive electrode plate and a negative electrode plate are flatly wound via a separator is accommodated in a concave portion of a main body case in which a joint is formed at an opening of a rectangular half-shell body, and the concave portion of the main body case is formed. A prismatic battery which is closed and the inside of a concave portion is sealed by welding a lid plate mounted on the joint portion to the joint portion,
The prismatic battery, wherein the electrode plate group has a width in a direction orthogonal to a winding direction, wherein the positive electrode plate and the negative electrode plate are formed to be smaller than the inner width of the recess, and the separator is formed to be larger than the inner width of the recess. . 2. The prismatic battery according to claim 1, wherein the cover plate is formed with a recess toward the inside of the recess, with a position at a predetermined distance from the inner circumferential wall of the recess of the main body case as an outer circumferential wall. A recess is formed in the cover plate toward the inside of the recess by using a position at a predetermined distance from the inner circumferential wall of the recess of the main body case as an outer circumferential wall, and an outer dimension is defined between the outer circumferential wall of the recess and the inner circumferential wall of the recess. 2. The prismatic battery according to claim 1, wherein an insulating frame body having a width smaller than the width and an inner size larger than the width of the positive electrode plate and the negative electrode plate is inserted. An electrode plate group in which a positive electrode plate and a negative electrode plate are flatly wound via a separator is accommodated in a concave portion of a main body case in which a joint is formed at an opening of a rectangular half-shell body, and the concave portion of the main body case is formed. In a method for manufacturing a prismatic battery that is closed and welded to a joint portion with a lid plate placed on the joint portion to seal the inside of the concave portion,
The electrode plate group has a width in a direction orthogonal to the winding direction, the positive electrode plate and the negative electrode plate are formed smaller than the inner width of the recess, and the separator is formed larger than the inner width of the recess. By inserting the edge into the separator, the end of the separator is bent downstream in the insertion direction, and the separator is interposed between the end of the positive electrode plate and / or the negative electrode plate and the inner peripheral wall of the concave portion. Production method. When the electrode group is inserted into the concave portion, the resin film is inserted between at least the side surface perpendicular to the winding direction of the electrode group and the inner wall of the concave portion, and the portion of the resin film that protrudes outside the concave portion is softened by heating. The method for manufacturing a prismatic battery according to claim 4, wherein the rectangular battery is bent and shaped on the electrode plate group together with the bent edges of the separator. The method for manufacturing a prismatic battery according to claim 5, wherein the resin film is a material whose softening temperature is lower than the melting temperature of the separator. An electrode plate group in which a positive electrode plate and a negative electrode plate are flatly wound via a separator is accommodated in the concave portion of the main body case in which the joint portion is formed at the opening of the rectangular half shell, and the concave portion of the main body case is provided. In the method for manufacturing a prismatic battery that closes and seals the inside of the recess by welding a lid plate mounted on the joint to the joint,
The electrode plate group, the width in the direction perpendicular to the winding direction, the positive electrode plate and the negative electrode plate are formed smaller than the recess inner width dimension, the separator is formed larger than the recess inner width dimension,
The insertion jig is formed by inserting the electrode plate group into the recess through a frame-shaped insertion jig having an outer dimension smaller than the inner wall width of the recess and an inner dimension larger than the width of the positive electrode plate and the negative electrode plate. A method of manufacturing a prismatic battery, comprising: inserting an electrode plate group into a recess with an end of a separator bent toward the downstream side in the insertion direction.

Images