JP2015069767A - Electrode body protective plate, power storage element, and method of manufacturing power storage element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a high quality power storage element by bonding a collector and an electrode body well.SOLUTION: In a nonaqueous electrolyte secondary battery 1 having an electrode body 11, and a collector 12 being joined to the electrode body 11, an electrode body protective plate 13 for sandwiching the electrode body 11 with the collector 12 includes a principal surface 13a that is superposed on the outer wall 11b1 of the electrode body 11, and a sub-surface 13b formed continuously from the principal surface 13a and inclining toward the end face of the electrode body 11 or facing the end face. The dimension of the principal surface 13a including 1, along the ridge line 13c1 formed by the principal surface 13a and sub-surface 13b is larger than the overall length of the ridge line 13c1.

Description

  The present invention relates to an electrode body protection plate used for protecting an electrode body in a power storage element such as a secondary battery or other batteries, a power storage element using the same, and a method for manufacturing the same.

  Secondary batteries are widely used as power sources for electronic devices such as mobile phones and IT devices, as well as for replacing primary batteries. In particular, a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery has a high energy density, and is therefore being applied to industrial large electric devices such as electric vehicles.

  A non-aqueous electrolyte secondary battery generally includes an electrode body and an electrolytic solution in which positive and negative electrode plates separated by a microporous membrane separator are stacked inside a conductive metal container. Furthermore, the electrode body has a configuration connected to a current collector fixed in the container (see, for example, Patent Document 1, FIG. 3 and the like).

Japanese Patent No. 5122617

  In a conventional non-aqueous electrolyte secondary battery, the electrode body and the current collector are joined by ultrasonic welding, resistance welding, etc. of the metal foil portion of the electrode plate exposed from the separator of the electrode body and the current collector. It is made by. For example, in ultrasonic welding, a horn needs to be brought into contact with a joint portion, while a low-strength metal foil portion needs to be protected from vibration during welding. Therefore, as in Patent Document 1, a metal protective plate is interposed between the horn and the metal foil portion, and the electrode body and the current collector are ultrasonically welded together with the protective plate.

  However, during such welding, the periphery of the protective plate that contacts the horn vibrates and interferes with the surface of the metal foil. This leads to breakage of the metal foil and generation of metal pieces, and may cause a defect of the electrode body.

  The present invention has been made in view of the above problems, and an electrode body protection plate capable of obtaining a high-quality power storage element by favorably joining a current collector and an electrode body, and a power storage element using the same The purpose is to provide.

In order to achieve the above object, the first aspect of the present invention provides:
In an electricity storage device having an electrode body and a current collector joined to the electrode body, an electrode body protection plate sandwiching the electrode body together with the current collector,
A first plate portion overlaid on the surface of the electrode body;
Formed continuously from the first plate part,
A second plate portion inclined toward the end face of the electrode body or opposed to the end face;
The dimension of the first plate portion along the ridge formed by the first plate portion and the second plate portion is larger than the total length of the ridge.
This is an electrode body protection plate.

The second aspect of the present invention is
The first plate portion intersects a pair of planes perpendicular to the ridge that respectively pass through both ends of the ridge.
It is an electrode body protection board of the 1st side of the present invention.

The third aspect of the present invention is
The dimension of the second plate part along the ridge is smaller than the dimension of the first plate part,
It is an electrode body protection board of the 1st or 2nd side of the present invention.

The fourth aspect of the present invention is
The electrode body protection plate is
A third plate formed continuously from the first plate portion in a direction different from that of the second plate portion, and curved or bent with respect to the first plate portion and separated from the surface of the electrode body. Part
Both ends of the first plate portion protrude from the boundary between the first plate portion and the third plate portion, respectively.
4 is an electrode body protection plate according to any one of the first to third aspects of the present invention.

The fifth aspect of the present invention provides
From the ridge, has a notch formed across at least one of the first plate portion and the second plate portion,
4 is an electrode body protection plate according to any one of the first to fourth aspects of the present invention.

The sixth aspect of the present invention provides
An electrode body, a current collector joined to the electrode body, and an electrode body protection plate sandwiching the electrode body together with the current collector,
As the electrode body protection plate, the electrode body protection plate according to any one of the first to fifth aspects of the present invention,
The end of the first plate is spaced from the surface of the electrode body;
It is a power storage element.

The seventh aspect of the present invention is
A method for manufacturing a power storage device using the electrode body protection plate according to any one of the first to fifth aspects of the present invention,
Overlay the current collector on one side of the electrode body,
Superimposing the first plate portion of the electrode body protection plate on the other surface of the electrode body;
In a state where the electrode body is sandwiched between the current collector and the first plate portion, a predetermined portion of the first plate portion is pressurized, and the end portion of the first plate portion is connected to the electrode body. A step of separating from the surface,
It is a manufacturing method of an electrical storage element.

  The present invention as described above has an effect that it is possible to obtain a high-quality power storage element by favorably joining the current collector and the electrode body.

1 is an exploded perspective view showing a configuration of a nonaqueous electrolyte secondary battery according to an embodiment of the present invention. The front view which shows the structure of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention The perspective view which shows the structure of the electrode body of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention. (A) The perspective view which shows the structure of the electrode body protection board of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The electrode body protection board of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention The perspective view which shows the structure of The figure for demonstrating joining with a collector, an electrode body protection board, and an electrode body of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (A) The figure for demonstrating the joining process of the electrical power collector and electrode body using the electrode body protection board of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) Embodiment of this invention For explaining the joining process between the current collector and the electrode body using the electrode body protection plate of the non-aqueous electrolyte secondary battery according to FIG. (A) The perspective view which shows the other structural example of the electrode body protection board of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The electrode of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention The perspective view which shows the other structural example of a body protection board (A) The perspective view which shows the other structural example of the electrode body protection board of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention (b) The electrode of the nonaqueous electrolyte secondary battery which concerns on embodiment of this invention The perspective view which shows the other structural example of a body protection board The schematic diagram for demonstrating the structure of the electrode body protection board of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view schematically showing a configuration of a nonaqueous electrolyte secondary battery 1 according to an embodiment of the present invention in a partially disassembled state, and FIG. 2 is a diagram of the nonaqueous electrolyte secondary battery 1. It is a front view.

  As shown in FIGS. 1 and 2, the nonaqueous electrolyte secondary battery 1 includes an aluminum open box-like container body 10 and a plate-like material made of the same material as the container body, which closes the opening 10 x of the container body 10. An outer hexahedron container configured with the lid 20 is provided as an exterior. In addition, each side of the container is positioned in parallel with the X axis, the Y axis, and the Z axis that form the orthogonal coordinates shown in FIG. 1, and in the following description, the directions of the X axis, Y axis, and Z axis arrows in the figure Are defined in order from right to left, front to back, and bottom to top, respectively.

  Further, in order to describe the internal configuration of the nonaqueous electrolyte secondary battery 1, the container body 10 is outlined by a broken line in FIG. 1 and the main part is shown as a perspective view. For the same reason, the container body 10 is shown in FIG. 2 as a cross-sectional view of the main part in which the right half is cut by a plane parallel to the ZY plane in the drawing.

  In the internal space 10z of the container body 10, an electrode body 11 having a configuration in which a positive electrode and a negative electrode, which are band-shaped electrodes, are wound in a long cylindrical shape with a separator interposed therebetween is disposed. In FIG. 1, for the sake of explanation, the electrode body 11 is shown in a state where it is combined with the lid portion 20 and is partially extracted from the container body 10.

  In the electrode body 11, the both ends of the winding axis | shaft are made into the current collector foil part to which the collector 12 mentioned later is joined. The current collector foil portions are respectively located on the pair of short side surfaces of the container body 10. In the figure, only the configuration in the vicinity of the negative electrode current collector foil portion 11b where the negative electrode side metal foil is exposed is described with reference numerals, but the positive electrode side also has the same configuration.

  Here, with reference to FIG. 3, the detailed structure of the electrode body 11 is further demonstrated. As shown in FIG. 3, the electrode body 11 includes a separator 121 having a sheet-like negative electrode 120 laminated in order from the innermost periphery to the outer periphery, a porous film having electrolyte retention, a nonwoven fabric, and the like as a base material. Each member of the separator 123 made of the same material as the positive electrode 122 and the separator 121 is wound so that the cross-sectional shape orthogonal to the winding axis is a long cylindrical shape.

  The negative electrode 120 is configured, for example, by forming a mixture layer containing a negative electrode active material on the surface of a strip-shaped copper foil. The positive electrode 122 is configured, for example, by forming a mixture layer containing a positive electrode active material on the surface of a strip-shaped aluminum foil. Specifically, the negative electrode 120 and the positive electrode 122 include the mixture layer forming portions 120a and 122a in which the mixture layer is formed and the metal foil exposed portions 120b and 122b in which the mixture layer is not formed. The metal foil exposed portions 120b and 122b are formed along the longitudinal direction at one end in the short direction of the negative electrode 120 and the positive electrode 122.

  When the negative electrode 120 and the positive electrode 122 are wound, the metal foil exposed portion 120b is laminated on one end surface of the long cylindrical shape, and the metal is disposed on the other end surface by shifting to the both ends of the winding shaft. The foil exposed part 122b is laminated.

  Ultrasonic welding or the like in the state where the negative electrode side current collector foil portion 11b composed of the stacked metal foil exposed portions 120b of the electrode body 11 having the above configuration is sandwiched between the current collector 12 and the electrode body protection plate 13 The current collector 12 is joined by welding.

  The electrode body protection plate 13 is a member made of a metal material, and has a main surface portion 13a and a sub surface portion 13b. The main surface portion 13a is joined to the inner wall 11b3 of the negative current collector foil portion 11b. The sub-surface portion 13b is disposed on the end surface side of the electrode body 11, that is, on the end surface 11b2 side where the edge of the laminated metal foil of the negative current collecting foil portion 11b is exposed. Moreover, the main surface part 13a has the wing | blade part 13a1 bent to the X-axis direction near side in the both ends of a Z-axis direction. The detailed description of the electrode body protection plate 13 will be described later.

  Next, the current collector 12 includes an outer plate-like base portion 12a in which a through hole 12a1 for fixing to the lid portion 20 and electrical connection with an electrode terminal described later is opened, and the base portion 12a. A pair of leg portions 12b that extend and are formed in the internal space 10z along the Z-axis direction in the figure to connect to the electrode body 11 are provided.

  The pair of leg portions 12b are arranged in parallel along the X-axis direction in the figure and sandwich the electrode body 11 therebetween. As shown in FIG. 1, a joining surface 12 b 2 that is the back surface of the front surface 12 b 1 of the leg portion 12 b is joined to the outer wall 11 b 1 of the electrode body 11. The bonding surface 12b2 is not displayed because it is a blind spot in FIG. 1, and is schematically shown as a perspective view with a broken line together with the electrode body protection plate 13 in FIG.

  The current collector 12 is created by bending a single metal plate formed corresponding to each shape of the base portion 12a and the leg portion 12b. The current collector 12 may be formed by twisting a metal plate, or may be configured by combining a plurality of members.

  Further, as shown in FIG. 2, the current collector 12 has a metal connecting can 22 positioned on the lid portion 20 by caulking a rivet 24 inserted into the through hole 12 a 1 on the base portion 12 a. Electrically connected. Further, the connecting rod 22 is connected to an electrode terminal 23 for external connection, and a conductive path connecting the electrode terminal 23 and the electrode body 11 is completed.

  The conductive path is insulated from the container by a synthetic resin packing 21 and an insulating plate 25 which are insulators. The packing 21 also serves to seal the space and gap between the conductive path and the container in order to prevent leakage of the electrolyte from the inside of the container.

  In the above configuration, the nonaqueous electrolyte secondary battery 1 corresponds to a power storage element of the present invention. The electrode body 11 corresponds to the electrode body of the present invention. The current collector 12 corresponds to the current collector of the present invention, and the electrode body protection plate 13 corresponds to the electrode body protection plate of the present invention.

  The nonaqueous electrolyte secondary battery 1 according to the present embodiment having such a configuration is characterized by including an electrode body protection plate 13.

  Hereinafter, while describing in more detail with reference to FIGS. 4-6, one Embodiment of the manufacturing method of the electrical storage element of this invention is described by this. In addition, although the following description takes the negative electrode side current collection foil part 11b of the electrode body 11 shown in FIG.1 and FIG. 2 as an example, the same applies also to the positive electrode side current collection foil part.

  FIG. 4A is a perspective view of the electrode body protection plate 13 viewed from an oblique front from an oblique angle, and FIG. 4B is a perspective view of the electrode body protection plate 13 viewed from an oblique rear from an elevation angle.

  The electrode body protection plate 13 is formed by punching or cutting a single copper plate as a base material into a substantially T-shaped outer shape, and bending a portion where the T-shapes intersect. Further, as shown in each drawing of FIG. 4, the electrode body protection plate 13 has a rectangular main surface portion 13a developed on the ZY plane in the drawing and a substantially right angle with the center of the long side of the main surface portion 13a as a boundary. It has a sub-surface portion 13b having a rectangular outer shape that is bent and developed on the ZX plane in the drawing. That is, the ridgeline 13c1 is formed at the boundary between the main surface portion 13a and the sub surface portion 13b by bending the sub surface portion 13b with respect to the main surface portion 13a.

  The main surface portion 13a is longer than the sub surface portion 13b in the dimension in the Z-axis direction. Further, the main surface portion 13a is partitioned by a partition line 13c2 by a one-dot chain line in the drawing extending along the Y axis in the drawing from both ends of the ridge line 13c1. The part which protrudes along the Z-axis in the figure from the division line 13c2 is defined by a pair of wing | blade part 13a1. A pressurization region 13e to be pressurized during ultrasonic welding is defined on the surface 13a2 of the main surface portion 13a, and the pressurization region 13e is located closer to the center of the main surface portion 13a than the partition line 13c2.

  In the above description, the partition line 13c2 is an imaginary line for description, and does not need to be actually displayed on the surface 13a2 of the main surface portion 13a. The dotted line in the figure showing the outline of the pressurizing area 13e need not actually be displayed on the surface 13a2, but the outline of the pressurizing area 13e is actually displayed as marking by printing, engraving, etc. Also good. When aligning the horn and the pressure region 13e by visual observation or the like during ultrasonic welding, the alignment can be easily performed by referring to the marking.

  In the above description, the main surface portion 13a corresponds to the first plate portion of the present invention, the sub surface portion 13b corresponds to the second plate portion of the present invention, and the wing portion 13a1 corresponds to the first plate portion of the present invention. It corresponds to both ends of the plate part. The ridge line 13c1 corresponds to the ridge of the present invention.

  Bonding of the electrode body 11 and the current collector 12 using the electrode body protection plate 13 having such a configuration is performed as follows.

  First, as shown in FIG. 5, the end surface 11b2 of the negative electrode side current collector foil portion 11b of the electrode body 11 is expanded along the X-axis direction in the figure, and the joint surface 12b2 of the leg portion 12b of the current collector 12 is extended to the negative electrode side current collector. While making surface contact with the outer wall 11b1 of the electric foil part 11b, the electrode body protection plate 13 is overlapped with the inner wall 11b3 of the negative current collecting foil part 11b. At this time, the electrode body protection plate 13 is disposed so that the back surface 13a3 of the main surface portion 13a is in surface contact with the inner wall 11b3 and the back surface 13b2 of the sub surface portion 13b shown in FIG. 4B is in surface contact with the end surface 11b2.

  Next, the arrangement of the electrode body protection plate 13, the electrode body 11, and the current collector 12 as seen from the Y-axis direction in FIG. When performing ultrasonic welding on the pressurization region 13e on the surface 13a2 of the main surface portion 13a of the electrode body protection plate 13, a pair of horns of an ultrasonic welding machine (not shown) are in surface contact with the pressurization region 13e, When the anvil as a jig is brought into surface contact with the surface 12b1 of the leg 12b of the current collector 12, the electrode body protection plate 13, the electrode body 11, and the current collector 12 are sandwiched along the X-axis direction in the figure. The

  Further, as shown in the enlarged view of the main part of FIG. 6B, when the horn pressurizes the pressurizing region 13e toward the anvil as a preliminary operation of ultrasonic welding, the negative current collector foil portion 11b is in the pressurizing direction. Compressed along On the other hand, in the main surface portion 13a of the electrode body protection plate 13, the vicinity of the pressure region 13e is pressed against the outer wall 11b1 of the negative current collector foil portion 11b, and the wing portion 13a1 is bent with the vicinity of the partition line 13c2 as a fold line. It is separated from the outer wall 11b1 of the side current collector foil part 11b with a gap C.

  Thereby, the edge 13R of the wing part 13a1 shown in FIGS. 4A and 4B is kept in a non-contact state with the outer wall 11b1 of the negative current collector foil part 11b. At times, the risk of interference with the metal foil is reduced.

  The electrode body protection plate 13 has a T-shaped outer shape when deployed, and the main surface portion 13a and the sub surface portion 13b are bent. With the extended partition line 13c2 as a root, the configuration further protrudes along the Z-axis in the figure, so that deformation easily occurs when pressure is applied to the pressurizing region 13e.

  Further, the pressurizing region 13e is positioned closer to the center of the main surface portion 13a than the partition line 13c2 that is the base of the wing portion 13a1, so that the wing portion 13a1 is aligned with or close to the bending position of the wing portion 13a1. I try to bend well. Note that the distance between the partition line 13c2 and the pressurization region 13e is preferably about several mm or less.

  As a result, it is possible to follow both the outer wall 11b1 and the end surface 11b2 of the electrode body 11 with a good shape, and to prevent the surface from being damaged and obtain a good bonded state.

  Further, the electrode body protection plate 13 has a flat plate shape with the main surface portion 13a including the wing portion 13a1 in a state before pressurization, so that the electrode body protection plate 13 is on the outer wall 11b1 of the negative current collector foil portion 11b. Is easy to position, and the risk of displacement when the horn contacts is reduced.

  Thus, according to the nonaqueous electrolyte secondary battery 1 according to the embodiment of the present invention, the electrode body protection plate 13 according to the embodiment of the present invention is provided, and the configuration produced according to the manufacturing method described above is provided. In addition, it is possible to obtain a high-quality battery in which breakage and generation of metal pieces are suppressed, and good bonding between the current collector and the electrode body is realized.

  However, the present invention is not limited to the above embodiment.

  In the above description, the main surface portion 13a of the electrode body protection plate 13 is a flat plate shape except for a portion continuous to the sub surface portion 13b, but the first plate portion of the electrode body protection plate of the present invention. Is a warped portion in which the opposite side of the sub surface portion 14b is warped in the X-axis direction in the drawing, that is, in the opposite direction to the sub surface portion 14b, like the main surface portion 14a of the electrode body protection plate 14 shown in FIG. It may be configured to have 14f.

  In this case, the surface in the vicinity of the warped portion 14f is brought into contact with the outer wall 11b1 of the negative current collector foil portion 11b as a curved surface, and interference with the metal foil of the electrode body 11 during pressurization or ultrasonic welding is performed. The fear can be further reduced. At this time, the dimension of the warped portion 14f is desirably a minute amount that does not hinder the bending of the wing portion 14a1 due to the pressurization of the pressurizing region 14e.

  Furthermore, the 1st board part of the electrode body protection plate of this invention is the subsurface part 15b among the opposite sides of the subsurface part 15b like the main surface part 15a of the electrode body protection board 15 shown in FIG.7 (b). It is good also as a structure which has the curvature part 15f with the same dimension of a Z-axis direction.

  In the configuration example shown in FIG. 7B, the bent portion of the warped portion 15f coincides with the partition line 15c2 extending from the ridge line 15c1 in the main surface portion 15a or is positioned closer to the center of the main surface portion 15a than that in FIG. Similarly to the electrode body protection plate 13, the wing portion 15 a 1 can be sufficiently bent by pressurizing the pressurizing region 15 e.

  Furthermore, the electrode body protection plate of the present invention is cut like the electrode body protection plate 16 shown in FIG. 8A at both ends of the ridge line 16c1 formed by the main surface portion 16a and the sub surface portion 16b. The configuration may be such that a notch 16f is provided.

  According to this configuration, it is possible to improve the separation of the main surface portion 16a and the sub surface portion 16b around both ends of the ridge line 16c1, and to increase the bending accuracy of the wing portion 16a1 when the pressure region 16e is pressurized. In FIG. 8A, the notch 16f is formed over both the main surface portion 16a and the sub surface portion 16b, but may be formed only on either the main surface portion 16a or the sub surface portion 16b. Good. In particular, when the cutout is provided only in the sub surface portion 16b, it is possible to avoid the edge of the cutout from contacting the outer wall 11b1 of the negative current collector foil portion 11b, which is more preferable.

  Furthermore, the electrode body protection plate of the present invention may be configured such that the dimensions of the main surface portion 17a and the sub surface portion 17b in the Z-axis direction are the same as the electrode body protection plate 17 shown in FIG. In the electrode body protection plate 17, the main surface portion 17a and the sub surface portion 16b are connected at the ridge line 17c1, and are separated from both ends of the ridge line 17c1 through slits 17f formed along the Z-axis direction in the drawing.

  According to this configuration, the covering area of the end surface 11b2 of the negative current collector foil portion 11b by the sub surface portion 17b can be increased, and the electrode body 11 at the time of ultrasonic welding is on the ZY plane in the drawing, that is, laminated. It is possible to suppress positional deviation in the direction along the surface.

  In the above description, the electrode body protection plate 13 is composed of the rectangular main surface portion 13a and the sub surface portion 13b having a smaller area than the main surface portion 13a. When the first plate portion is pressurized by having a configuration in which the dimension of the first plate portion is larger than the total length of the ridge formed by the first plate portion and the second plate portion. The gist is that the end of the first plate portion is deformed so as to be separated from the surface of the electrode body.

  Therefore, according to the present invention, the first plate portion and the second plate portion are arranged such that the second plate portion formed continuously from the first plate portion is inclined or opposed to the electrode body side. As long as they form a ridge, they are not limited by the specific configuration of the first plate portion, the second plate portion, and the ridge. That is, as shown in FIG. 9, the first plate portion is shown as a main surface portion 13a having a rectangular shape on the ZY plane in the drawing, but a trapezoid, a triangle, other polygons, etc. on the same plane. It may have an arbitrary planar shape. Similarly, although the 2nd board part was shown as the subsurface part 13b which has a rectangular shape on the XZ plane in the figure, it may have arbitrary planar shapes on the same plane. In addition, the first plate portion and the second plate portion may have the same area, or the area of the second plate portion may be larger than the area of the first plate portion.

  Furthermore, although the ridge of the present invention is the ridge line 13c1 generated by bending the substrate of the first plate portion as shown in FIG. 9, it may have a curved form. In the drawing, the total length parallel to the Z-axis direction may be shorter than the dimension of the first plate portion in the same direction.

  Further, according to the present invention, the first plate portion can pass through both ends of the ridge formed by the first plate portion and the second plate portion and intersect a pair of planes perpendicular to the ridge. The gist is to have a shape. That is, as shown in FIG. 9, the rectangular main surface portion 13 a that is long in the Z-axis direction in the drawing is a ridge formed by the main surface portion 13 a as the first plate portion and the sub-surface portion 13 b as the second plate portion. It passes through both ends of the ridgeline 13c1 and intersects a pair of planes p perpendicular to the ridgeline 13c1. Thereby, the main surface portion 13a is partitioned from other portions by the partition line 13c2 on the surface 13a2, and both ends extending in the Z-axis direction in the figure are formed as a pair of wing portions 13a1.

  Therefore, as described above, the end portion in the direction along the ridge of the first plate portion only needs to protrude in the direction along the ridge, and in the above embodiment, the first plate portion of the present invention. Although the pair of wing portions 13a1 corresponding to both ends of the same shape and area are the same, they may have arbitrary different shapes or areas.

  In the above description, the electrode body 11, the current collector 12, and the electrode body protection plate 13 are joined by ultrasonic welding. However, in the present invention, the electrode body protection plate 13 is pressurized. If it includes the process which the both ends of a 1st board part deform | transform by this, it will not be limited by the specific aspect of joining. Therefore, the electrode body, the current collector, and the electrode body protection plate may be joined using resistance welding, laser welding, or any other technical means.

  Moreover, although the electrode body protection plate 13 shall be provided in the current collecting foil part of the positive / negative both poles of the electrode body 11, it is good also as a structure provided only in any one of a positive electrode or a negative electrode.

  In the above description, the electrode body of the present invention is a wound type, but may be a stacked type electrode body. In addition, although the nonaqueous electrolyte secondary battery 1 or 2 has a single electrode body, the power storage element of the present invention may have a configuration including a plurality of electrode bodies.

  In the above description, the storage element of the present invention is a non-aqueous electrolyte secondary battery represented by a lithium ion secondary battery. However, if the battery can be charged and discharged by an electrochemical reaction, nickel You may use a hydrogen battery and other various secondary batteries. Moreover, a primary battery may be sufficient. In short, the power storage element of the present invention is not limited by a specific method for generating electromotive force as long as it is an element capable of accumulating electricity formed by sealing an electrode body and an electrolyte in a container.

  In the above description, the present invention has a container composed of the container body 10 and the lid portion 20, but the present invention is not limited to the specific configuration of the container. The electrode body 11 may be configured to be sealed by the lid portion 20 in a state where the electrode body 11 is connected to the container body 10, or the electrode terminal and the like may be configured to be provided on the container body 10 side.

  Although the container body 10 is made of aluminum, it may be made of an aluminum alloy, stainless steel or any other metal or metal compound, resin, or aluminum laminate. Moreover, although the shape is an external hexahedron, it may be a prismatic shape whose bottom surface is a triangle or a polygon more than a pentagon. Furthermore, a cylindrical shape may be sufficient.

  In the above description, a single nonaqueous electrolyte secondary battery is taken as an example. However, the present invention is a power supply module in which at least one power storage element includes the power storage element of the present invention in a plurality of power storage elements. It may be realized as.

  In short, the present invention may be implemented by adding various modifications to the above-described embodiment, including those described above, as long as they do not depart from the spirit of the present invention.

  The present invention as described above has an effect that it is possible to obtain a high-quality power storage element by satisfactorily joining a current collector and an electrode body, and is useful in a power storage element such as a secondary battery. is there.

DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 10 Container main body 10x Opening 10z Inner space 11 Electrode body 11b Negative electrode side current collection foil part 11b1 Outer wall 11b2 End surface 11b3 Inner wall 12 Current collector 12a Base part 12a1 Through-hole 12b Leg part 12b1 Surface 12b2 Joint surface 13 Electrode protection plate 13a Main surface portion 13a1 Wing portion 13a2 Front surface 13a3 Back surface 13b Subsurface portion 13b1 End 13c1 Edge line 13c2 Dividing line 13e Pressurization region 13R Edge 20 Lid portion 21 Packing 22 Connection rod 23 Electrode terminal 24 Rivet 25 Insulating plate 120 Negative electrode 120a Mixture layer forming portion 120b, 122b Metal foil exposed portion 121, 123 Separator 122 Positive electrode

Claims (7)

In an electricity storage device having an electrode body and a current collector joined to the electrode body, an electrode body protection plate sandwiching the electrode body together with the current collector,
A first plate portion overlaid on the surface of the electrode body;
Formed continuously from the first plate part,
A second plate portion inclined toward the end face of the electrode body or opposed to the end face;
The dimension of the first plate portion along the ridge formed by the first plate portion and the second plate portion is larger than the total length of the ridge.
Electrode body protection plate. The first plate portion intersects a pair of planes perpendicular to the ridge that respectively pass through both ends of the ridge.
The electrode body protection plate according to claim 1. The dimension of the second plate part along the ridge is smaller than the dimension of the first plate part,
The electrode body protection plate according to claim 1 or 2. The electrode body protection plate is
A third plate formed continuously from the first plate portion in a direction different from that of the second plate portion, and curved or bent with respect to the first plate portion and separated from the surface of the electrode body. Part
Both ends of the first plate portion protrude from the boundary between the first plate portion and the third plate portion, respectively.
The electrode body protection board in any one of Claim 1 to 3. From the ridge, has a notch formed across at least one of the first plate portion and the second plate portion,
The electrode body protection board in any one of Claim 1 to 4. An electrode body, a current collector joined to the electrode body, and an electrode body protection plate sandwiching the electrode body together with the current collector,
The electrode body protection plate according to any one of claims 1 to 5 as the electrode body protection plate,
The end of the first plate is spaced from the surface of the electrode body;
Power storage element. It is a manufacturing method of an electrical storage element using the electrode body protection board according to any one of claims 1 to 5,
Overlay the current collector on one side of the electrode body,
Superimposing the first plate portion of the electrode body protection plate on the other surface of the electrode body;
In a state where the electrode body is sandwiched between the current collector and the first plate portion, a predetermined portion of the first plate portion is pressurized, and the end portion of the first plate portion is connected to the electrode body. A step of separating from the surface,
A method for manufacturing a storage element.

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