JP2013161719A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery which has an electrode terminal attached by caulking of a rivet, and in which an energy loss at an electrical connection between the rivet and a power generation element is suppressed.SOLUTION: A battery 10 includes a power generation element, a battery case accommodating the power generation element, a collector 130 connected to the power generation element, and an electrode terminal 200 connected to the collector 130. The electrode terminal 200 is provided with a rivet 210 passing through the battery case and a through hole 136 provided in the collector 130. The collector 130 is provided with a thick part 135, and the through hole 136 is provided in such a manner as to penetrate the thick part 135.

Description

  The present invention relates to a battery including a battery container that houses a power generation element, a current collector connected to the power generation element, and an electrode terminal connected to the current collector.

  In recent years, as an approach to global environmental problems, vehicles equipped with a motor as a power source, such as hybrid vehicles and electric vehicles, instead of conventional gasoline vehicles have begun to spread.

  Various batteries such as lithium ion secondary batteries are widely used as a power source for supplying electric power to motors provided in these hybrid vehicles.

  Such a battery includes, for example, a battery container in which a power generation element is accommodated, and an electrode terminal connected to the power generation element. The electrode terminal is generally attached to the battery container in a state of penetrating the lid of the battery container, and plays a role of deriving current from the power generation element to the outside of the battery container.

  When a battery having such a structure is used, for example, it is conceivable that a large external force acts on the electrode terminal. Therefore, a device for firmly fixing the electrode terminal to the battery container is required.

  Therefore, conventionally, a battery in which an electrode terminal is attached by a caulking member has been proposed (see, for example, Patent Document 1). According to this battery, the electrode terminal is connected to the electrode plate in the battery container by the plurality of caulking members extending inward of the battery container. Thereby, rotation and breakage of the electrode terminal are prevented.

JP 2009-231140 A

  Here, the caulking member (for example, a rivet) provided on the electrode terminal is electrically connected to the power generation element via a current collector, for example. Specifically, the head of the rivet is caulked using a caulking machine in a state where the rivet is inserted into a through hole provided in the current collector.

  In the battery having such a structure, with the recent increase in capacity and current of the storage element, the contact area of the electrical connection portion between the power generation element and the electrode terminal is widened. There is a problem of wanting to suppress energy loss as much as possible.

  Therefore, for example, it is possible to improve the adhesion between the rivet and the current collector by caulking the rivet of the electrode terminal more strongly, thereby reducing the contact resistance between the rivet and the current collector. It is done.

  However, if the pressing force when caulking the rivet is increased, if measures against the pressing force are not taken, for example, the generation of distortion in the vicinity of the rivet of a member such as a current collector or packing There is also the possibility of causing problems.

  In view of the above-described conventional problems, the present invention provides a battery including an electrode terminal that is attached by caulking a rivet, in which energy loss at an electrical connection portion between the rivet and the power generation element is suppressed. The purpose is to provide.

  In order to achieve the above object, a battery according to an aspect of the present invention includes a power generation element, a battery container that houses the power generation element, a current collector connected to the power generation element, and a connection to the current collector. The electrode terminal is provided with a rivet that penetrates the battery container and a through hole provided in the current collector, and the current collector has a thick portion And the through hole is provided so as to penetrate the thick part.

  According to this configuration, the rivet provided in the electrode terminal is caulked in a state of penetrating the thick part of the current collector. Therefore, the contact area between the rivet and the current collector is increased as compared with the case where there is no thick part. As a result, energy loss at the electrical connection between the rivet and the power generation element is suppressed.

  Moreover, the strength of the portion near the rivet in the current collector is improved by providing the thick portion. Therefore, for example, even when the rivet is caulked with a relatively large pressing force, the occurrence of distortion in the vicinity of the rivet is suppressed. That is, the rivet can be more uniformly adhered to the current collector while eliminating adverse effects such as distortion caused by the pressing force during caulking.

  Further, the thick wall portion may be provided only in the through hole portion of the current collector. Therefore, the above effect can be obtained while suppressing the increase in the weight of the current collector by providing the thick portion to a range that does not substantially cause a problem with respect to the weight of the entire battery.

  Further, in the battery according to one aspect of the present invention, the shape and size of the through hole provided in the thick portion may be the shape and size that contact the outer peripheral surface of the rivet over the entire circumference. Good.

  According to this configuration, the contact area between the outer peripheral surface of the rivet and the inner peripheral surface of the through hole is maximized, whereby the contact resistance between the rivet and the current collector is further reduced. As a result, energy loss at the electrical connection between the rivet and the power generation element is further suppressed.

  Further, in the battery according to one aspect of the present invention, the thick portion is formed by attaching a current collecting auxiliary member having a hole forming a part of the through hole to the current collector. Also good.

  According to this configuration, the thick portion can be realized by attaching the current collecting auxiliary member to the current collector. Therefore, for example, it is possible to produce a battery having a thick portion provided on the current collector using a conventional current collector.

  Further, for example, the current collecting auxiliary member can be produced by making a hole in a disk-shaped metal plate. Therefore, it is possible to easily produce a current collector provided with a thick portion.

  In the battery according to one aspect of the present invention, the current collecting auxiliary member has a protrusion on the surface on the current collector side, and the protrusion bites into the current collector by caulking the rivet. Also good.

  According to this configuration, for example, the contact area between the current collector auxiliary member and the surface of the current collector can be increased, and as a result, the contact resistance between the current collector auxiliary member and the current collector is reduced. Is done.

  Moreover, the battery which concerns on 1 aspect of this invention WHEREIN: The said thick part is good also as being integrally formed in the said electrical power collector by forming the part around the said through-hole thickly.

  According to this configuration, the thick portion is provided as an element integrated with the current collector. Therefore, for example, high stability of the conduction state between the rivet and the current collector is ensured. For example, the battery assembly procedure can be simplified.

  ADVANTAGE OF THE INVENTION According to this invention, it is a battery provided with the electrode terminal attached by crimping a rivet, Comprising: The battery by which the loss of energy in the electrical connection part of a rivet and an electric power generation element was suppressed can be provided.

It is a perspective view which shows the outline | summary of the internal structure of the battery in embodiment of this invention. It is a fragmentary sectional view which shows an example of the attachment structure of the electrode terminal in the battery of embodiment. It is sectional drawing which shows an example of a structure of the thick part in embodiment. It is a bottom view which shows an example of a structure of the thick part in embodiment. It is sectional drawing which shows an example of the attachment process of the electrode terminal in embodiment. It is a figure which shows an example of the cross section of the current collection auxiliary | assistance member which has protrusion. It is a perspective view which shows the example of a shape of the processus | protrusion formed by punching out a current collection auxiliary member. It is a figure which shows the 1st modification of the thick part in embodiment. It is a figure which shows the 2nd modification of the thick part in embodiment. It is a figure which shows the 3rd modification of the thick part in embodiment. It is a figure which shows the 4th modification of the thick part in embodiment. It is a fragmentary sectional view which shows an example of the attachment structure of an electrode terminal provided with the rivet integrally formed in the base | substrate.

  Hereinafter, a battery according to an embodiment of the present invention will be described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  In the embodiment described below, a preferred specific example of the present invention is shown. The numerical values, shapes, components, arrangement of components and connection forms shown in the embodiments are merely examples, and are not intended to limit the present invention. The invention is limited by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims are not necessarily required to achieve the object of the present invention, but are described as elements that constitute a more preferable embodiment. The

  First, a general description of the battery 10 in the embodiment of the present invention will be given with reference to FIG.

  FIG. 1 is a perspective view showing an outline of the internal structure of battery 10 according to the embodiment of the present invention. That is, FIG. 1 is a diagram in which a part of a battery container 100 described later is omitted in order to illustrate the internal structure of the battery 10.

  The battery 10 is a secondary battery that can charge and discharge electricity, for example, a non-aqueous electrolyte secondary battery. Examples of the non-aqueous electrolyte secondary battery include a lithium ion secondary battery in which the positive electrode active material is a lithium transition metal oxide such as lithium cobaltate and the negative electrode active material is a carbon material.

  The type of the battery 10 is not limited to the non-aqueous electrolyte secondary battery, and may be a secondary battery other than the non-aqueous electrolyte secondary battery, or may be a primary battery such as a dry battery.

  As shown in FIG. 1, the battery 10 in the embodiment includes a battery container 100, an electrode terminal 200, and an electrode terminal 300. In the present embodiment, the electrode terminal 200 is a positive terminal, and the electrode terminal 300 is a negative terminal.

  In the present embodiment, the electrode terminal 200 includes a base body 201 and a rivet 210 that penetrates the base body 201. The electrode terminal 300 includes a base body 301 and a rivet 310 that penetrates the base body 301.

  The base 201 and the base 301 are solid conductors. In addition, the shape of the base 201 and the base 301 is a cylinder in the present embodiment, but the shape of the base 201 and the base 301 is not particularly limited, and may be a shape other than a cylinder such as a rectangular parallelepiped.

  The battery container 100 includes a main body having a rectangular cylindrical shape made of metal and having a bottom, and a metal lid plate 110 that closes an opening of the main body. Further, the battery container 100 has a structure in which the power generation element 120 and the like are accommodated therein, and then the lid plate 110 and the main body are welded or the like to seal the inside.

  Further, the electrode terminal 200 is attached to the lid plate 110 of the battery container 100 via a packing 230 for maintaining the airtightness of the battery container 100. Similarly, the electrode terminal 300 is also attached to the lid plate 110 of the battery case 100 via the packing 330.

  Specifically, as shown in FIG. 1, the base 201 of the electrode terminal 200 is disposed outside the battery container 100, and the rivet 210 of the electrode terminal 200 penetrates the battery container 100 and the current collector 130. It is caulked in the state.

  Similarly, the electrode terminal 300 is also disposed in the battery container 100. That is, the base body 301 is disposed outside the battery container 100, and the rivet 210 is caulked in a state of penetrating the battery container 100 and the current collector 140.

  In addition, a connection part such as a bolt hole (not shown) is formed on each of the base bodies 201 and 301, for example, and power from the battery 10 is supplied to a device such as a motor via a conductive member attached to the connection part. Is supplied.

  Further, as shown in FIG. 1, a power generation element 120 is accommodated inside the battery case 100, and a positive current collector 130 and a negative current collector 140 are arranged. Yes. In addition, although liquid, such as electrolyte solution, may be enclosed in the battery container 100 of the battery 10, illustration of the liquid is omitted.

  Although the detailed illustration is omitted, the power generation element 120 includes a positive electrode, a negative electrode, and a separator, and is a member that can store electricity. The negative electrode is obtained by forming a negative electrode active material layer on the surface of a long strip-shaped negative electrode substrate made of copper foil. In the positive electrode, a positive electrode active material layer is formed on the surface of a long belt-like positive electrode substrate made of aluminum foil.

  The separator is a microporous sheet made of resin. The power generation element 120 is formed in a layered shape so that the separator is sandwiched between the negative electrode and the positive electrode, and is wound in the length direction so that the whole becomes an oval shape. Yes.

  The current collector 130 is disposed between the positive electrode of the power generation element 120 and the side wall of the battery container 100, and has a conductivity and rigidity that are electrically connected to the electrode terminal 200 and the positive electrode of the power generation element 120. It is. That is, the electrode terminal 200 is connected to the positive electrode of the power generation element 120 via the current collector 130.

  The current collector 140 is disposed between the negative electrode of the power generation element 120 and the side wall of the battery container 100, and has electrical conductivity and rigidity that are electrically connected to the electrode terminal 300 and the negative electrode of the power generation element 120. It is a member. That is, the electrode terminal 300 is connected to the negative electrode of the power generation element 120 via the current collector 140.

  Specifically, each of current collectors 130 and 140 is a metal plate-like member arranged in a bent state along the side wall of battery case 100 and lid plate 110.

  Further, the current collector 130 is provided with a thick portion 135, and the rivet 210 of the electrode terminal 200 is caulked in a state of penetrating through a through hole provided in the thick portion 135. Further, the current collector 140 is provided with a thick portion 145, and the rivet 310 of the electrode terminal 300 is caulked in a state of penetrating through a through hole provided in the thick portion 135.

  That is, the current collector 130 is fixedly connected to the lid plate 110 by the rivet 210, and the current collector 140 is fixedly connected to the lid plate 110 by the rivet 310. Furthermore, current collectors 130 and 140 are fixedly connected to the positive electrode and the negative electrode of power generation element 120 by welding or the like, respectively.

  As a result, the power generation element 120 is held in a state of being suspended from the cover plate 110 by the current collectors 130 and 140 inside the battery container 100.

  The current collector 130 is made of aluminum as in the positive electrode, and the current collector 140 is formed of copper as in the negative electrode.

  Further, the method for joining the current collectors 130 and 140 to the positive electrode and the negative electrode of the power generation element 120 is not limited to a specific method. For example, a method is adopted in which a welding fin (not shown) is erected by bending a part of the current collectors 130 and 140, and the positive electrode and the negative electrode of the power generation element 120 are sandwiched between the fins by welding. .

  Next, the detail of the attachment part of the electrode terminal 200 is demonstrated using FIG.

  In the present embodiment, the positive electrode terminal 200 and the negative electrode terminal 300 have the same structure and the same technical characteristics. Therefore, the following description will be focused on the electrode terminal 200 and its peripheral portion, and detailed description on the electrode terminal 300 and its peripheral portion will be omitted.

  FIG. 2 is a partial cross-sectional view showing an example of the attachment structure of the electrode terminal 200 in the battery 10 of the embodiment.

  Specifically, the cross-sectional view shown in FIG. 2 shows a cross section in the vicinity of the electrode terminal 200 when the vicinity of the center in the depth direction (Y-axis direction) of the battery 10 in FIG. 1 is cut in parallel to the XZ plane. .

  As shown in FIG. 2, the electrode terminal 200 is attached to the lid plate 110 via a packing 230.

  The packing 230 is produced by molding, for example, resin, and is a member for maintaining the airtightness of the battery container 100 at the attachment portion of the rivet 210 and insulating the battery container 100 and the current collector 130. .

  Note that the packing 230 may be provided on the lid plate 110 as an integrated body by insert molding, for example. Moreover, the packing 230 may be comprised from two parts divided | segmented up and down in FIG. 2, for example.

  Further, the rivet 210 is caulked in a state of penetrating through the cover plate 110 and the packing 230 and further penetrating through a through hole 136 provided in the thick portion 135 of the current collector 130.

  The thick part 135 is a part having a larger thickness (thickness in the axial direction of the through-hole 136) than the other part in the current collector 130. In the present embodiment, thick portion 135 is formed by attaching current collection auxiliary member 150 having a hole that forms a part of through hole 136 to current collector 130. The current collection auxiliary member 150 is a flat member made of a conductive material such as aluminum, for example.

  As described above, the current collector 130 in the present embodiment includes the thick portion 135, and the rivet 210 provided in the electrode terminal 200 through the inner peripheral surface of the through hole 136 provided in the thick portion 135. Electrically connected.

  Therefore, the contact area between the rivet 210 and the current collector 130 increases as compared with the case where the thick portion 135 does not exist in the current collector 130. As a result, energy loss at the electrical connection between the rivet 210 and the power generation element 120 is suppressed.

  Next, the configuration of the thick portion 135 provided in the current collector 130 and various modifications will be described with reference to FIGS.

  FIG. 3 is a cross-sectional view showing an example of the configuration of the thick portion 135 in the embodiment.

  FIG. 4 is a bottom view showing an example of the configuration of the thick portion 135 in the embodiment.

  In FIG. 4, in order to easily identify each of the current collector 130 and the current collection auxiliary member 150, the current collector 130 is hatched, and the current collection auxiliary member 150 is a grid line. .

  In the present embodiment, as shown in FIGS. 3 and 4, the shape of the through hole 136 provided in the thick portion 135 is the same as that of the rivet 210 having a cylindrical shaft portion and a cut surface parallel to the XY plane. The same circular shape (including substantially the same, hereinafter the same). Further, the inner diameter of the through hole 136 is the same as the outer diameter of the shaft portion of the rivet 210.

  That is, in the present embodiment, the shape and size of the through hole 136 provided in the thick portion 135 are the shape and size that contact the outer peripheral surface of the rivet 210 over the entire circumference.

  Thereby, the contact area between the outer peripheral surface of the rivet 210 and the inner peripheral surface of the through hole 136 is maximized, and as a result, the contact resistance between the rivet 210 and the current collector 130 is further reduced.

  Even if the inner diameter of the through-hole 136 is larger than the outer diameter of the rivet 210 before caulking, the outer diameter of the rivet 210 is enlarged by caulking the rivet 210, and as a result, The rivet 210 can be brought into contact with the entire circumference of the inner circumferential surface.

  FIG. 5 is a cross-sectional view showing an example of an attachment process of the electrode terminal 200 in the embodiment.

  As shown in FIG. 5A, the rivet 210 is inserted into a hole provided in the packing 230 from above the cover plate 110 on which the packing 230 is disposed. As a result, the tip portion of the rivet 210 is inserted into the through hole 136 provided in the thick portion 135.

  The current collecting auxiliary member 150 may be joined to the lower surface of the current collector 130 by, for example, welding before the rivet 210 is inserted into the through hole 136.

  Next, as shown in FIG. 5B, the rivet 210 is caulked. Specifically, for example, the entire structure including the electrode terminal 200 is disposed so that the tip of the rivet 210 faces upward. In this state, the rivet 210 is caulked by pressing the tip of the rivet 210 from above by the punch of the caulking machine. As a result, a flange-shaped head is formed at the tip of the rivet 210 as shown in FIG.

  Here, a thick portion 135 is provided in a portion of the current collector 130 to which a pressing force is applied via the flange-shaped head. Therefore, for example, the occurrence of distortion of the current collector 130 due to the pressing force is suppressed.

  Further, for example, the rivet 210 can be caulked with a larger pressing force than when the thick portion 135 is not provided. Thereby, for example, the electrode terminal 200 can be stably fixed by the battery container 100 and the rivet 210 can be more uniformly adhered to the current collector 130.

  In the present embodiment, current collecting auxiliary member 150 has a disk shape having a hole in the center, as shown in FIGS. However, the current collection auxiliary member 150 only needs to have a hole that forms a part of the through hole 136, and the shape of the current collection auxiliary member 150 is not particularly limited.

  For example, a polygonal metal plate having a hole that forms a part of the through hole 136 may be employed as the current collection auxiliary member 150.

  Moreover, the current collection auxiliary member 150 may have, for example, a protrusion that bites into the current collector 130.

  FIG. 6 is a diagram illustrating an example of a cross section of the current collecting auxiliary member 150 having the protrusion 151.

  For example, as shown in FIG. 6A, when the current collection auxiliary member 150 has a protrusion 151 on the surface on the current collector 130 side (the upper surface in FIG. 6), (b) in FIG. ), The protrusion 151 bites into the current collector 130 by caulking a rivet 210 (not shown in FIG. 6B).

  Thereby, for example, the contact area between the current collector auxiliary member 150 and the surface of the current collector 130 can be increased. As a result, the contact resistance between the current collector auxiliary member 150 and the current collector 130 can be increased. Is reduced.

  Note that, for example, a metal having a hardness higher than that of the current collector 130 may be employed as a material of the current collection auxiliary member 150 so that the protrusion 151 can easily bite into the current collector 130.

  Further, there is no particular limitation on the method of forming the protrusions 151 of the current collection auxiliary member 150. For example, it may be formed by punching out the current collecting auxiliary member 150, which is a flat metal, from the lower surface (the surface opposite to the current collector 130) with a punch or the like.

  FIG. 7 is a perspective view showing an example of the shape of the protrusion 151 formed by punching out the current collecting auxiliary member 150.

  For example, in the current collecting auxiliary member 150, a portion around a hole forming a part of the through hole 136 (a central hole of the current collecting auxiliary member 150) is punched with a punch with a force that allows a minute hole to be formed. Thereby, the protrusion 151 as shown in FIG. 7 can be formed. That is, the protrusion 151 can be provided on the current collection auxiliary member 150 by an easy process.

  The minute holes are not essential, and the protrusions 151 may be formed without forming holes by pressing a punch or the like against the lower surface of the flat plate-like current collecting auxiliary member 150.

  In FIG. 7, four protrusions 151 are formed on the current collecting auxiliary member 150, but the number of protrusions 151 is not particularly limited.

  Moreover, the thick part 135 with which the battery 10 is provided is not limited to the structure shown in FIG. 3 etc., The structure other than the said structure may be employ | adopted. Various modifications of the thick portion 135 in the embodiment will be described with reference to FIGS.

  FIG. 8 is a diagram illustrating a first modification of the thick portion 135 in the embodiment.

  The thick portion 135 shown in FIG. 8 is formed integrally with the current collector 130 by forming a thick portion around the through hole 136.

  That is, in the present embodiment, the current collector auxiliary member 150 is attached to the current collector 130 to form the thick portion 135 in the current collector 130. However, as shown in FIG. The thick part 135 may be provided as an integral element.

  By doing so, for example, high stability of the conduction state between the rivet 210 and the current collector 130 is ensured. Further, the assembly procedure of the battery 10 can be simplified.

  FIG. 9 is a diagram illustrating a second modification of the thick portion 135 in the embodiment.

  The cross-sectional shape of the thick portion 135 shown in FIG. 9 that protrudes from the surface of the current collector 130 is a trapezoid.

  That is, the cross-sectional shape of the portion of the thick portion 135 protruding from the current collector 130 does not have to be a rectangle as shown in FIG. 3, and may be a trapezoid as shown in FIG. In addition, the cross-sectional shape of the protruding portion may be a shape in which a part or the whole is configured by a curve.

  That is, the shape of the thick portion 135 is not particularly limited as long as it is thicker than other portions of the current collector 130. The shape of the thick portion 135 may be appropriately determined according to, for example, the ease of forming the thick portion 135 or the positional relationship between the thick portion 135 and the other components of the battery 10. .

  FIG. 10 is a diagram illustrating a third modification of the thick portion 135 in the embodiment.

  FIG. 11 is a diagram illustrating a fourth modification of the thick portion 135 in the embodiment.

  The thick portion 135 shown in FIG. 10 is provided on the current collector 130 by forming a portion protruding upward from the current collector 130.

  In addition, the thick portion 135 illustrated in FIG. 11 is provided in the current collector 130 by forming a portion protruding vertically from the main body of the current collector 130.

  That is, the protruding direction of the thick portion 135 does not have to be inside the battery container 100, and may be outside the battery container 100 as shown in FIG. Further, as shown in FIG. 11, the thick portion 135 may have a shape that protrudes up and down from the current collector 130.

  That is, the thick portion 135 only needs to be thicker (the thickness in the axial direction of the through hole 136) than other portions of the current collector 130. The protruding direction of the thick portion 135 may be appropriately determined according to, for example, the ease of assembly of the battery 10 or the positional relationship between the thick portion 135 and the other components of the battery 10.

  As described above, the battery according to one embodiment of the present invention has been described based on the embodiment and the modifications thereof. However, the present invention is not limited to these embodiments and modifications thereof. As long as it does not deviate from the gist of the present invention, various modifications conceived by those skilled in the art may be applied to the present embodiment or its modifications, or a structure constructed by combining a plurality of constituent elements described above. Included within the scope of the invention.

  For example, the cross-sectional shape of the thick portion 135 shown in FIGS. 9 to 11 is applied to the thick portion 135 formed by attaching the current collection auxiliary member 150 to the current collector 130 shown in FIG. Also good.

  That is, a shape other than a rectangle such as a trapezoid may be employed as the cross-sectional shape of the current collection auxiliary member 150. In addition, the current collecting auxiliary member 150 may be attached to the upper surface of the current collector 130, or the current collecting auxiliary member 150 may be attached to each of the upper surface and the lower surface of the current collector 130.

  For example, in the above-described embodiment, one positive terminal (electrode terminal 200) and one negative terminal (electrode terminal 300) are provided on the same surface (cover plate 110) of the battery container 100, respectively. However, one or more of the positive electrode terminal and the negative electrode terminal may be provided on different surfaces such as the upper surface (lid plate 110) and the lower surface (bottom plate) of the battery 10, respectively.

  When the electrode terminal (positive electrode terminal or negative electrode terminal) is disposed on the side surface or the lower surface other than the upper surface (cover plate 110) of the battery container 100, the rivet of the electrode terminal is the side wall or the bottom plate of the battery container 100. Can be installed through.

  Further, the electrode terminal 200 in the above embodiment is attached to the battery 10 by one rivet 210. However, the electrode terminal 200 may be attached to the battery 10 by two or more rivets 210.

  In addition, the electrode terminal 200 in the above embodiment is composed of the base body 201 and the rivet 210 separate from the base body. However, the rivet 210 may be provided in the electrode terminal 200 by being formed integrally with the base body 201.

  FIG. 12 is a partial cross-sectional view showing an example of an attachment structure of an electrode terminal 200a including a rivet 210a formed integrally with the base body 201a.

  As shown in FIG. 12, even when the battery 10 employs the electrode terminal 200a including the rivet 210a formed integrally with the base body 201a, various effects such as suppression of energy loss by the thick portion 135 are achieved. Is demonstrated.

  The present invention can provide a battery including an electrode terminal attached by caulking a rivet, in which energy loss at an electrical connection portion between the rivet and the power generation element is suppressed. Therefore, the battery according to the present invention is useful as a battery mounted in an automobile or the like that requires a large current for a long time.

DESCRIPTION OF SYMBOLS 10 Battery 100 Battery container 110 Cover plate 120 Power generation element 130,140 Current collector 150 Current collection auxiliary member 135, 145 Thick part 136 Through hole 200, 200a, 300 Electrode terminal 201, 201a, 301 Base body 210, 210a, 310 Rivet 230, 330 packing

Claims (5)

A battery comprising: a power generation element; a battery container that houses the power generation element; a current collector connected to the power generation element; and an electrode terminal connected to the current collector,
The electrode terminal includes a rivet that penetrates the battery container and a through hole provided in the current collector,
The battery is provided with a thick part, and the through hole is provided so as to penetrate the thick part. The battery according to claim 1, wherein a shape and a size of the through hole provided in the thick portion are a shape and a size that are in contact with the outer peripheral surface of the rivet on the entire circumference. The battery according to claim 1, wherein the thick portion is formed by attaching a current collecting auxiliary member having a hole forming a part of the through hole to the current collector. The battery according to claim 3, wherein the current collecting auxiliary member has a protrusion on a surface on the current collector side, and the protrusion bites into the current collector by caulking the rivet. The battery according to claim 1, wherein the thick portion is formed integrally with the current collector by forming a thick portion around the through hole.

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