JP2021114375A - Manufacturing apparatus of laminate battery - Google Patents

Abstract

To provide a manufacturing apparatus capable of manufacturing a high quality laminate battery with high productivity.SOLUTION: A manufacturing apparatus of a laminate battery disclosed here comprises: a pair of pressure plates 10 holding outer casing films 122 and 124 therebetween; heating means of heating the pressure plates 10; and transfer means of bringing the pressure plates 10 close to and separate from each other. Then, the pressure plate 10 comprises, a metal base part 12, and an elastic member 14 attached to the whole front surfaces of the base part 12 opposite to the outer casing films 122 and 124. In a region where a terminal weld part W2 of the pressure plate 10 is pressed, a concave part 12a is formed in the base part 12, and a concave part 14a is formed in the elastic member 14. A concave part 14a of the elastic member 14 is fitted into the concave part 12a of the base part 12. Thus, the generation of various kinds of weld failures in a weld part W of an outer casing 120 of the laminate battery 100 are prevented, and the laminate battery 100 with a high quality can be manufactured with high productivity.SELECTED DRAWING: Figure 4

Description

The present invention relates to a laminated battery manufacturing apparatus. More specifically, the present invention relates to an apparatus used for manufacturing a laminated battery in which an electrode body is housed inside an outer body made of a laminated film.

In recent years, secondary batteries such as lithium ion secondary batteries have become increasingly important as power sources for vehicles, personal computers and mobile terminals. In particular, a lithium ion secondary battery is preferably used as a high-output power source for mounting on a vehicle because it is lightweight and can obtain a high energy density. As one form of this type of secondary battery, a battery in which an electrode body is housed inside an outer body made of a laminated film (hereinafter, also referred to as “laminated battery”) can be mentioned. When constructing such a laminated battery, the outer peripheral edge portion of the exterior film is pressed and heated to be welded while the electrode body is sandwiched between the pair of exterior films. As a result, a bag-shaped exterior body having a welded portion is formed on the outer peripheral edge portion, and the electrode body is housed inside the exterior body.

Laminated batteries usually include long plate-shaped electrode terminals that electrically connect an electrode body inside the exterior to an external device (other battery, motor, etc.). One end of the electrode terminal is connected to the electrode body inside the exterior body, and the other end portion is exposed to the outside of the exterior body. For this reason, a film welded portion in which the exterior films are welded to each other and a terminal welded portion in which the exterior film is welded to the surface (both sides) of the plate-shaped electrode terminals are formed in the welded portion on the outer peripheral edge portion of the exterior body. .. At this time, the terminal welded portion tends to have a welding defect more easily than the film welded portion.

For example, when a welded portion including a film welded portion and a terminal welded portion is pressurized and heated, the behavior of heat transfer differs between the film welded portion and the terminal welded portion. Further, in the terminal welding portion, heat for heat welding is transferred to the electrode terminals, so that the heat used for welding the exterior film may be insufficient. On the other hand, in the technique described in Patent Document 1, a heat insulating material is interposed between the jig body of the heat welding jig and the heater in the portion corresponding to the terminal portion of the electrode. As a result, it is possible to equalize the welding temperature between the portion where the electrode terminal is led out (terminal welding portion) and the portion where the electrode terminal is not (film welding portion) and suppress welding failure.

Further, in a laminated battery, if a gap is formed between the welded portion and the electrode body, it causes wrinkles during use. On the other hand, in the technique described in Patent Document 2, at least a part (separator, electrode sheet, etc.) of the electrode body is sandwiched and pressed by a pressurizing jig having an elastic member interposed therebetween. As a result, it is possible to prevent a gap from being formed between the electrode body and the welded portion.

Further, when the terminal welded portion of the laminated battery is welded, a strong pressure is applied to the terminal welded portion where the electrode terminals are present, and the outer film (inner resin layer) or the like may be damaged or deformed. In the manufacturing method described in Patent Document 3, a press plate having a recess is used, and welding is performed in a state where the recess of the press plate and the electrode terminal (terminal welding portion) are aligned. This makes it possible to prevent excessive pressure from being applied to the exterior film of the terminal welded portion.

International Publication No. 2014/188774 Japanese Unexamined Patent Publication No. 2018-206541 Japanese Unexamined Patent Publication No. 2000-348695

By the way, in the welded portion of the laminated battery, the terminal welded portion in which the electrode terminals are present is thicker than the film welded portion, so that an uneven shape is formed. If pressure cannot be applied to follow this uneven shape, welding defects may occur in the welded portion. For example, when pressure is applied for the purpose of suitable welding of the film welded portion, excessive pressure may be applied to the terminal welded portion to elute the exterior film. On the other hand, if pressure is applied for the purpose of suitable welding of the terminal welded portion, the pressure on the film welded portion may be insufficient and welding failure may occur. Further, a step is formed at the boundary between the terminal welding portion and the film welding portion, and there is a possibility that welding failure may occur at the step portion. Laminated batteries with these welding defects may deteriorate in performance due to the intrusion of moisture into the exterior body, and are discarded or corrected in the quality inspection before shipment, which causes a decrease in productivity. ..

However, a technique capable of appropriately following the difference in thickness between the terminal welded portion and the film welded portion to perform welding has not yet been proposed. For example, in the technique described in Patent Document 1, a heat insulating material that functions as an elastic member is arranged in a region that pressurizes the terminal welded portion. However, in this technology, since the elastic member is not arranged in the region where the film welded portion is pressed, when the electrode terminal becomes thin due to the manufacturing tolerance, excessive pressure is applied to the film welded portion and the exterior film is eluted. May occur. Further, in a manufacturing site where a large amount of laminated batteries are manufactured, it is difficult to accurately align the terminal welding portions of all the laminated batteries with the elastic members of the pressurizing device, and the metal in which the elastic members are not arranged is difficult. The member may pressurize the terminal weld. In this case, in addition to the above-mentioned welding defects, there is a possibility that irreparable defects such as deformation and breakage of the electrode terminals may occur.

Further, in Patent Document 2, an elastic member is arranged on the entire surface of the pressurizing jig. As a result, the elastic member can be welded while being deformed according to the uneven shape of the welded portion. However, since the pressure applied to each of the terminal welding portion and the film welding portion still remains non-uniform, it is difficult to reliably prevent welding defects. On the other hand, in Patent Document 3, since the recess of the press plate and the terminal welded portion are aligned and welded, the pressure applied to each of the terminal welded portion and the film welded portion can be made uniform. However, as in the technique described in Patent Document 1, it is difficult to prevent deformation / breakage of the electrode terminals and occurrence of welding defects due to misalignment. Further, in Patent Document 3, since pressure is applied by a metal member that does not elastically deform, it is insufficient to follow the step at the boundary between the terminal welded portion and the film welded portion, and there is a possibility that welding failure may occur at the boundary portion. There is.

The present invention has been made to solve such a problem, and its main purpose is to prevent the occurrence of welding defects in the welded portion of the exterior body of the laminated battery, and to obtain a high quality laminated battery with high productivity. It is an object of the present invention to provide a manufacturing apparatus capable of manufacturing.

In order to solve the above problems, the present invention provides a laminated battery manufacturing apparatus having the following configuration (hereinafter, also simply referred to as “manufacturing apparatus”).

The manufacturing apparatus disclosed herein is a manufacturing apparatus for manufacturing a laminated battery. This laminated battery has an electrode body, an exterior body composed of a pair of exterior films facing each other across the electrode body, and a plate-shaped electrode having one end connected to the electrode body and the other end exposed to the outside of the exterior body. A welded portion including a terminal and a film welded portion in which the exterior films are welded to each other and a terminal welded portion in which the exterior film is welded to the surface of the electrode terminal is formed on the outer peripheral edge portion of the exterior body. Further, the manufacturing apparatus disclosed herein includes a pair of pressure plates for sandwiching an exterior film, heating means for heating the pressure plates, and moving means for moving the pressure plates closer to and apart from each other. It includes a metal base portion connected to the means and an elastic member attached to the entire surface of the base portion facing the exterior film. In the region where the terminal welded portion of at least one of the pressure plates of the pair of pressure plates is pressed, a concave portion is formed in the base portion and a convex portion is formed in the elastic member, and the concave portion of the base portion is elastic. The convex part of the member is fitted.

First, in the manufacturing apparatus disclosed here, an elastic member is attached to the entire surface of the substrate portion facing the exterior film. In other words, all the pressure surfaces of the laminated battery with respect to the welded portion are made of elastic members. As a result, welding can be performed while deforming the elastic member so as to follow the step at the boundary between the terminal welding portion and the film welding portion, so that welding failure at the step at the boundary portion can be prevented. Further, since the elastic member can absorb the manufacturing tolerance and the misalignment, it is possible to prevent welding defects and deformation / damage of the electrode terminals due to these. Then, in the manufacturing apparatus disclosed herein, a concave portion is formed in the base portion in the region where the terminal welding portion of the pressure plate is pressed, and a convex portion is formed in the elastic member. As a result, the pressure applied to each of the terminal welding portion and the film welding portion can be made uniform, so that welding defects such as elution of the exterior film at the terminal welding portion and welding failure at the film welding portion can be suitably prevented. As described above, according to the manufacturing apparatus disclosed herein, it is possible to prevent the occurrence of welding defects in the welded portion of the exterior body, so that a high-quality laminated battery can be manufactured with high productivity.

It is a top view which shows typically the laminated battery. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. It is a perspective view which shows typically the manufacturing apparatus of the laminated battery which concerns on one Embodiment of this invention. It is a figure which shows typically the cross section along the height direction of the pressure plate of the manufacturing apparatus of the laminated battery which concerns on one Embodiment of this invention. It is sectional drawing which shows typically the welding process by the manufacturing apparatus of the laminated battery which concerns on one Embodiment of this invention. It is a figure which shows typically the cross section along the height direction of the pressure plate of the manufacturing apparatus of the laminated battery which concerns on other embodiment of this invention.

Hereinafter, an embodiment of the laminated battery manufacturing apparatus disclosed herein will be described with reference to the drawings. In addition, matters other than those specifically mentioned in the present specification and necessary for carrying out the present invention (for example, specific structures of moving means and heating means) are based on prior art in the art. It can be grasped as a design matter of a person skilled in the art. In each of the figures shown in the present specification, members / parts having the same action are described with the same reference numerals. Further, the dimensional relations (length, width, thickness, etc.) in each drawing do not reflect the actual dimensional relations. Then, reference numeral X in each figure indicates "width direction", reference numeral Y indicates "depth direction", and reference numeral Z indicates "height direction". It should be noted that these directions are defined for convenience of explanation, and are not intended to limit the techniques disclosed herein.

1. 1. Structure of Laminated Battery The manufacturing apparatus according to this embodiment is used for manufacturing a laminated battery. In this specification, before explaining the manufacturing apparatus, the laminated battery to be manufactured will be described. FIG. 1 is a plan view schematically showing a laminated battery. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. As shown in FIGS. 1 and 2, the laminated battery 100 includes an electrode body 110, an exterior body 120, and an electrode terminal 130. Hereinafter, each member will be described.

The detailed structure of the electrode body 110 is not particularly limited, and an electrode body having a conventionally known structure can be used without particular limitation. For example, the electrode body 110 may be a wound electrode body in which a long electrode sheet is wound through a separator. Further, the electrode body 110 may be a laminated electrode body in which a plurality of rectangular electrode sheets are laminated via a separator. The structure and material of each member (for example, an electrode sheet, a separator, etc.) constituting the electrode body are not particularly limited, and those that can be used for this type of secondary battery can be used without particular limitation. Is omitted.

The exterior body 120 is composed of a pair of exterior films 122 and 124 facing each other with the electrode body 110 interposed therebetween. The exterior films 122 and 124 are laminated films including an insulating resin layer. The exterior films 122 and 124 are arranged so that the resin layers face each other with the electrode body 110 interposed therebetween. The resin layer is made of, for example, polypropylene, polyethylene, polychlorotrifluoroethylene, or the like. A welded portion W formed by pressurizing and heating the opposing exterior films 122 and 124 is formed on the outer peripheral edge portion of the exterior body 120. The exterior films 122 and 124 may be films having a multilayer structure having a layer other than the resin layer. For example, from the viewpoint of improving strength, an exterior film having a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between resin layers is preferable. The thickness t1 of the exterior films 122 and 124 is about 10 μm to 200 μm.

The electrode terminal 130 is a conductive member for electrically connecting the electrode body 110 to an external device. The electrode terminal 130 is made of a conductive material such as aluminum, copper, or nickel. The electrode terminal 130 is a plate-shaped member extending in the width direction X, one end 132 of which is connected to the electrode body 110, and the other end 134 of which is exposed to the outside of the exterior body 120. The electrode terminal 130 shown in FIG. 1 includes a positive electrode terminal connected to the positive electrode of the electrode body 110 and a negative electrode terminal connected to the negative electrode. The thickness t2 of the electrode terminal 130 is about 0.1 mm to 1.0 mm.

The welded portion W of the laminated battery 100 is composed of a film welded portion W1 and a terminal welded portion W2. The film welded portion W1 is a portion where the exterior films 122 and 124 are welded to each other, and is formed on the entire area of both side edges and a part of both ends of the exterior body 120. On the other hand, the terminal welding portion W2 is a portion where the exterior films 122 and 124 are welded to the surface of the electrode terminal 130. The terminal welding portions W2 are formed at both ends of the exterior body 120 in the width direction X. As shown in FIG. 2, the thickness of the film welded portion W1 in the laminated battery 100 is substantially the same as the total thickness t1 of the pair of exterior films 122 and 124. On the other hand, the thickness of the terminal welded portion W2 is substantially the same as the total thickness t1 of the exterior films 122 and 124 plus the thickness t2 of the electrode terminal 130. As described above, in the welded portion W, the terminal welded portion W2 in which the electrode terminal 130 is present is thicker than the film welded portion W1, so that an uneven shape is formed, and the film welded portion W1 and the terminal welded portion W2 are formed. There is a step at the boundary.

2. Laminated Battery Manufacturing Device Hereinafter, a manufacturing device (laminated battery manufacturing device) used for manufacturing the laminated battery 100 having the above-mentioned structure will be described. FIG. 3 is a perspective view schematically showing a laminated battery manufacturing apparatus according to the present embodiment. FIG. 4 is a diagram schematically showing a cross section of the pressurizing plate of the laminated battery manufacturing apparatus according to the present embodiment along the height direction. FIG. 5 is a cross-sectional view schematically showing a welding process by the laminated battery manufacturing apparatus according to the present embodiment.

As shown in FIG. 3, the manufacturing apparatus 1 according to the present embodiment includes a pressure plate 10, a heating means 20, and a moving means 30. Hereinafter, each configuration will be described.

(1) Pressurizing Plate This manufacturing apparatus 1 includes a pair of pressurizing plates 10 that sandwich the exterior films 122 and 124. Specifically, each pressure plate 10 is a rectangular plate-shaped member extending along the depth direction Y. The upper surface of the lower pressure plate 10 and the bottom surface of the upper pressure plate 10 are arranged so as to face each other, and the exterior films 122 and 124 of the laminated battery 100 are arranged between them. As shown in FIG. 4, the pressure plate 10 includes a base portion 12 and an elastic member 14. The base portion 12 is a metal member having predetermined thermal conductivity and strength. The substrate portion 12 is made of, for example, iron, aluminum, chromium, nickel, an alloy thereof, or the like. Further, the base portion 12 is connected to the moving means 30 described later.

On the other hand, the elastic member 14 is made of a material having predetermined heat resistance and elasticity. The elastic member 14 is made of, for example, rubber, polytetrafluoroethylene, polyimide, or the like. Among these, rubber is suitable because it has suitable elasticity, and among rubbers, silicon rubber having excellent heat resistance is particularly preferable. Then, in the manufacturing apparatus 1 according to the present embodiment, the elastic member 14 is attached to the entire surface of the base portion 12 facing the exterior films 122 and 124. That is, in the present embodiment, all the pressure surfaces of the laminated battery 100 with respect to the welded portion W are composed of elastic members 14. The elastic member 14 may or may not be attached to the surface of the substrate portion 12 that does not face the exterior films 122 and 124 (that is, the non-pressurized surface).

In the region where the terminal welding portion W2 of the pressure plate 10 of the manufacturing apparatus 1 according to the present embodiment is pressed, the concave portion 12a is formed in the base portion 12 and the convex portion 14a is formed in the elastic member 14. .. Then, the convex portion 14a of the elastic member 14 is fitted into the concave portion 12a of the base portion 12. Therefore, in the manufacturing apparatus 1 according to the present embodiment, the thickness L1a of the portion (terminal pressurizing portion 14b) that pressurizes the terminal welding portion W2 of the elastic member 14 presses the film welding portion W1 of the elastic member 14 (the portion that pressurizes the film welding portion W1 of the elastic member 14. It is thicker than the thickness L2a of the film pressurizing portion 14c).

(2) Heating means The heating means 20 is a mechanism for heating the pressure plate 10. In the manufacturing apparatus 1 according to the present embodiment, heating means 20 are attached to each of the upper surface of the upper pressure plate 10 and the bottom surface of the lower pressure plate 10 (see FIG. 3). As long as the entire pressure surface of the pressure plate can be uniformly heated to a desired temperature, the installation position of the heating means is not particularly limited. For example, the heating means may be built in the base portion of the pressure plate. Further, the specific structure of the heating means 20 is not particularly limited, and a conventionally known heater can be used without particular limitation. The heating temperature by the heating means 20 is preferably set in consideration of the thermal conductivity of the pressure plate 10 and the welding temperature of the exterior films 122 and 124. For example, the heating temperature by the heating means 20 is preferably set so that the exterior films 122 and 124 can be heated in the range of 150 ° C. to 250 ° C. via the pressure plate 10.

(3) Moving means The moving means 30 is a mechanism for bringing the pressure plate 10 closer to and further from each other. The exterior films 122 and 124 can be pressurized and heated and welded by the moving means 30 bringing the high temperature pressure plates 10 close to each other and sandwiching the exterior films 122 and 124 between the pair of pressure plates 10. .. The specific structure of the moving means 30 is not particularly limited, and a conventionally known structure can be used without particular limitation. For example, the moving means 30 is based on a drive unit (air cylinder or the like) that moves the pressure plate 10 along the height direction Z, a pressure gauge that measures the pressure applied to the pressure target, and the measurement results of the pressure gauge. It is preferable to include a control unit that controls the operation of the drive unit. Thereby, the pressure applied to the exterior films 122 and 124 during welding can be stabilized.

In the manufacturing apparatus 1 according to the present embodiment, the moving means 30 is directly attached to the base portion 12 of the pressure plate 10. However, the manufacturing apparatus disclosed herein is not limited to such a structure. For example, the moving means 30 may be attached to the base portion 12 via another member (for example, the heating means 20). Further, in the manufacturing apparatus 1 shown in FIG. 3, the moving means 30 is attached to both the upper and lower pair of pressure plates 10. However, the moving means may be attached to only one of the upper and lower pressure plates. In this case, the exterior film can be pressurized by bringing the other pressure plate close to one of the fixed pressure plates.

(4) Welding of Exterior Film When performing the welding process using the manufacturing apparatus 1 according to the present embodiment, first, as shown in FIGS. 3 and 4, one end of the laminated battery 100 in the width direction X is pressed. It is arranged between a pair of upper and lower pressure plates 10. At this time, the position of the laminated battery 100 in the depth direction Y is adjusted so that the recess 12a of the base portion 12 of the pressure plate 10 and the terminal welding portion W2 of the laminated battery 100 are aligned along the height direction Z. In this state, the heating means 20 is operated to raise the temperature of the pressure plate 10 to a predetermined temperature, and then the moving means 30 is operated to bring the pair of upper and lower pressure plates 10 close to each other. Then, as shown in FIG. 5, the welded portion W of the laminated battery 100 is sandwiched between the pair of upper and lower pressure plates 10 to pressurize and heat the laminated battery 100. Then, by maintaining this state for a predetermined time (about 1 second to 200 seconds), the outer films 122 and 124 are welded to each other in the film welded portion W1 and the outer film 122 is welded to the surface of the electrode terminal 130 in the terminal welded portion W2. , 124 are welded. As a result, the bag-shaped exterior body 120 having the welded portion W is formed, and the electrode body 110 (see FIG. 1) is housed inside the exterior body 120.

At this time, in the present embodiment, all the pressure surfaces for the laminated battery 100 are composed of elastic members 14. As a result, welding can be performed while deforming the pressure surface (elastic member 14) so as to follow the step at the boundary between the film welding portion W1 and the terminal welding portion W2. Therefore, it is possible to prevent poor welding at the boundary portion. Further, even if the recess 12a of the base portion 12 of the pressure plate 10 and the terminal welding portion W2 of the laminated battery 100 are displaced, the displacement can be absorbed by the elastic member 14. Therefore, welding defects due to misalignment and deformation / damage of the electrode terminals can be suppressed. Further, since the manufacturing tolerance such as the variation in the thickness of the electrode terminal 130 can be absorbed by the elastic member 14, welding defects due to the manufacturing tolerance can be prevented.
Further, in the manufacturing apparatus 1 according to the present embodiment, the concave portion 12a is formed in the base portion 12 in the region where the terminal welding portion W2 of the pressure plate 10 is pressed, and the convex portion 14a is formed in the elastic member 14. As a result, the pressure applied to each of the terminal welding portion W2 and the film welding portion W1 can be made uniform, so that welding defects due to non-uniform pressure can be prevented.
As described above, according to the manufacturing apparatus 1 according to the present embodiment, it is possible to prevent the occurrence of various welding defects in the welded portion W of the exterior body 120 of the laminated battery 100, and to manufacture the high quality laminated battery 100 with high productivity. ..

(5) Design of Pressurizing Plate In the manufacturing apparatus 1 according to the present embodiment, the terminal pressurizing portion of the elastic member 14 is provided so that the deformation rate of the elastic member 14 before and after pressurization becomes uniform over the entire depth direction Y. It is preferable that the thickness L1a of 14b and the thickness L2a of the film pressurizing portion 14c are adjusted. As a result, the pressure applied to the welded portion W of the laminated battery 100 can be made more uniform, and the occurrence of welding defects can be more preferably prevented. Hereinafter, a specific description will be given.

First, the "deformation rate of the elastic member" refers to the ratio of the amount of deformation of the elastic member 14 after pressurization to the thickness of the elastic member 14 before pressurization. For example, when the thickness of the terminal pressurizing portion 14b before pressurization is "L1a" and the thickness of the terminal pressurization portion 14b after pressurization is "L1b", the "deformation rate of the terminal pressurizing portion" is as follows. It is calculated based on the formula (1) of. On the other hand, when the thickness of the film pressurizing portion 14c before pressurization is "L2a" and the thickness of the film pressurizing portion 14c after pressurization is "L2b", the "deformation rate of the film pressurizing portion" is as follows. It is calculated based on the formula (2) of.
Deformation rate of terminal pressurizing part = (L1a-L1b) / L1a (1)
Deformation rate of film pressurizing part = (L2a-L2b) / L2a (2)

Then, the thickness L1a of the terminal pressurizing portion 14b and the thickness of the film pressurizing portion 14c before pressurization so that the "deformation rate of the terminal pressurizing portion" and the "deformation rate of the film pressurizing portion" are substantially equal. By adjusting each of L2a, the pressure applied to the welded portion W can be more preferably made uniform. For example, when trying to apply a pressure (1/3 E (Pa)) that is one-third of the longitudinal elastic modulus E (Pa) of the elastic member 14 to the welded portion W, the pressure is applied in the entire region of the elastic member 14. It is necessary to reduce the deformation rate to 1/3. At this time, the terminal pressurizing portion 14b is deformed more than the film pressurizing portion 14c by the height T (see FIG. 2) of the step at the boundary portion. Therefore, the thickness L2a of the film pressurizing portion 14c before pressurization is three times (3T) the height T of the step at the boundary, and the thickness L1a of the terminal pressurizing portion 14b before pressurization is the boundary. The depth of the concave portion 12a of the base portion 12 (that is, the amount of protrusion of the convex portion 14a of the elastic member 14) is adjusted so as to be 6 times (6T) the height T of the step. Then, the pressing force from the moving means 30 is controlled so that the film pressurizing portion 14c elastically deforms to the same degree as the height T of the step at the boundary portion. As a result, the thickness L2b of the film pressurizing portion 14c after pressurization becomes 2T, while the thickness L1b of the terminal pressurizing portion 14b after pressurization becomes 4T. When the deformation rates of the terminal pressurizing section 14b and the film pressurizing section 14c at this time are calculated based on the above equations (1) and (2), both are reduced to 1/3 and are uniform over the entire welded portion W. Pressure can be applied.

The above description gives an example for making the pressures on each of the film welding portion W1 and the terminal welding portion W2 substantially the same, and the thickness L1a of the terminal pressing portion 14b and the film pressing portion 14c The thickness L2a of is not limited to this. For example, by adjusting the respective thicknesses L1a and L2a so that the ratio of the deformation rate of the film pressurizing section 14c to the deformation rate of the terminal pressurizing section 14b is within the range of 0.5 times to 2.0 times. The pressure on the welded portion W can be made uniform to the extent that welding defects do not occur. Further, from the viewpoint of more reliably preventing the occurrence of welding defects, the ratio of the deformation rate of the film pressurizing portion 14c to the deformation rate of the terminal pressurizing portion 14b is more preferably 0.75 times to 1.25 times. , 0.8 times to 1.2 times, more preferably 0.85 times to 1.15 times, and for example, 0.9 times to 1.1 times.

3. 3. Other Embodiments The laminated battery manufacturing apparatus disclosed herein is not limited to the above-described embodiment, and includes various embodiments. Hereinafter, other embodiments of the manufacturing apparatus disclosed herein will be described. FIG. 6 is a diagram schematically showing a cross section of the pressure plate of the laminated battery according to another embodiment along the height direction.

In the above-described embodiment, as shown in FIG. 4, an elastic member 14 having a flat pressing surface is formed on the pressure plate 10. However, the shape of the pressing surface of the elastic member is not limited to the above-described embodiment. For example, as shown in FIG. 6, a recess 14d may be formed in a region (terminal pressurizing portion 14b) for pressurizing the terminal welding portion W2 of the elastic member 14. By forming the recess 14d in the terminal pressurizing portion 14b of the elastic member 14 in this way, the pressure applied to each of the terminal welding portion W2 and the film welding portion W1 can be more easily made uniform. On the other hand, from the viewpoint of facilitating the alignment of the laminated battery 100, it is preferable to flatten the pressing surface of the elastic member 14 as in the embodiment shown in FIG.

As described above, in order to make the pressures on each of the terminal welding portion W2 and the film welding portion W1 more uniform, the deformation rate of the terminal pressing portion 14b and the deformation rate of the film pressing portion 14c should be approximated. Is preferable. At this time, when the recess 14d is formed in the terminal pressurizing portion 14b as in the present embodiment, the terminals are added so that the thickness L1a of the terminal pressurizing portion 14b and the thickness L2a of the film pressurizing portion 14c are substantially the same. It is preferable to adjust the depth of each of the recess 14d of the pressing portion 14b and the recess 12a of the base portion 12. For example, the depth of the recess 14d of the terminal pressurizing portion 14b is substantially equal to the height T of the step at the boundary between the film welding portion W1 and the terminal welding portion W2 (typically 0.8 to 1.2 times). , Preferably 0.9 to 1.1 times, for example 1 time), and the recess 12a of the base portion 12 so that the thickness L1a of the terminal pressurizing portion 14b and the thickness L2a of the film pressurizing portion 14c are substantially equal. By adjusting the depth of the welded portion W, the deformation rate of each portion can be approximated and the pressure on the welded portion W can be more preferably made uniform.

Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

1 Manufacturing equipment 10 Pressurizing plate 12 Base part 12a Recessed part 14 Elastic member 14a Convex part 14b Terminal Pressurizing part 14c Film Pressurizing part 14d Recessed part 20 Heating means 30 Transportation means 100 Laminated battery 110 Electrode body 120 Exterior body 122 Exterior film 124 Exterior film 130 Electrode terminal W Welding part W1 Film welding part W2 Terminal welding part

Claims (1)

An electrode body, an exterior body composed of a pair of exterior films facing each other across the electrode body, and a plate-shaped electrode terminal having one end connected to the electrode body and the other end exposed to the outside of the exterior body. A welded portion including a film welded portion in which the exterior films are welded to each other and a terminal welded portion in which the exterior film is welded to the surface of the electrode terminal is formed on the outer peripheral edge portion of the exterior body. A manufacturing device that manufactures laminated batteries.
A pair of pressure plates that sandwich the exterior film,
A heating means for heating the pressure plate and
The pressure plate is provided with a moving means for bringing the pressure plate closer to and further away from the pressure plate.
The pressure plate is
A metal substrate connected to the means of transportation and
It is provided with an elastic member attached to the entire surface of the substrate portion facing the exterior film.
In the region where the terminal welding portion of at least one of the pair of pressure plates is pressed, a concave portion is formed in the base portion and a convex portion is formed in the elastic member of the base portion. A device for manufacturing a laminated battery in which a convex portion of the elastic member is fitted in a concave portion.

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