JP2009037817A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery with an internal terminal and an external terminal strongly bonded to each other. <P>SOLUTION: The battery 100 comprises an electrode body 80 having a positive electrode and a negative electrode, and a case 40 storing electrolyte together with the electrode body 80. It has the internal terminal 12 connected to the electrode body 80 and having a protruded portion protruded to the outside of the case 40, and the external terminal 16 arranged outside the case 40 and connected to the protruded portion 14 of the internal terminal 12. The external terminal 16 has a through-hole 18 into which the protruded portion 14 of the internal terminal 12 can be inserted. The protruded portion 14 of the internal terminal 12 is caulked in the state that its front end is inserted into the through-hole 18. In at least one of an outer peripheral face 15 of the protruded portion 14 and an inner peripheral face 17 of the through-hole 18 which are pushed against each other by the caulking, a depression 30 is formed into which the other face pushed by the caulking can be bitten while being deformed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a battery structure, and more particularly to a battery terminal structure.

In recent years, lithium-ion batteries, nickel-metal hydride batteries, and other secondary batteries have become increasingly important as power sources for vehicles or as power sources for personal computers and portable terminals. In particular, a lithium ion battery that is lightweight and obtains a high energy density is expected to be preferably used as a high-output power source mounted on a vehicle. In this type of battery, a battery structure is known in which an electrode body is housed in a battery case and an electrode terminal connected to the electrode body is drawn out to an upper end (lid body) of the battery case. For example, Patent Document 1 discloses a sealed battery in which one electrode terminal is drawn out to a lid of a battery case, and is crimped to the lid via a gasket.
JP 2000-208130 A

  By the way, in this kind of battery, there is one in which an internal terminal connected to the electrode body is attached to the lid of the battery case via an external terminal to constitute the electrode terminal. In this case, the joining between the internal terminal and the external terminal is often performed by a caulking process in order to ensure sufficient joining strength. That is, the end of the internal terminal protruding from the lid of the battery case is caulked and joined to the external terminal to produce an integrated electrode terminal.

  However, the conventional method described above still has room for improvement in terms of the bonding strength between the internal terminal and the external terminal. If the joint strength between the two can be further strengthened, the contact resistance is stabilized, which is very beneficial.

  This invention is made in view of this point, and is providing the battery which can join an internal terminal and an external terminal firmly.

  The battery of this invention is a battery comprised from the electrode body provided with a positive electrode and a negative electrode, and the container which accommodates an electrolyte with the said electrode body. This battery includes an internal terminal having a protruding portion that is connected to the electrode body and protrudes to the outside of the container, and an external terminal that is disposed outside the container and is connected to the protruding portion of the internal terminal. The external terminal has a through hole into which the protruding portion of the internal terminal can be inserted, and the protruding portion of the internal terminal is crimped with its tip inserted into the through hole. Then, the depression on which the other surface pressed by the caulking is deformed and bites into at least one of the outer peripheral surface of the protruding portion and the inner peripheral surface of the through hole that are pressed against each other by the caulking. Is formed.

  In the battery having such a configuration, since a recess is formed on at least one side of the outer peripheral surface of the protruding portion and the inner peripheral surface of the through hole that are pressed against each other by the caulking process, the recess on the one side surface is formed. The surface on the other side can be pressed and deformed to be bitten. Thereby, an internal terminal and an external terminal can be joined firmly and the contact resistance of an internal terminal and an external terminal is also stabilized.

  Such a recess may be provided on the internal terminal side (the outer peripheral surface of the protruding portion) or may be provided on the external terminal side (the inner peripheral surface of the through hole). Alternatively, it can be provided on both the internal terminal side and the external terminal side. Even with such a battery structure, the internal terminal and the external terminal can be firmly joined.

  In a preferable aspect of the battery disclosed herein, a plurality of the recesses are provided on the inner peripheral surface of the through hole. And it is characterized by the outer peripheral surface of the protrusion part pressed by the squeezing deform | transforming into the some hollow. By providing a plurality of depressions in this way, the bonding between the internal terminal and the external terminal is further strengthened.

  In a preferred aspect of the battery disclosed herein, the battery further includes a pressing mechanism that presses the outer peripheral surface of the protruding portion and the inner peripheral surface of the through-hole with the caulking of the protruding portion. By pressing with this pressing mechanism, it becomes possible to further strengthen the joint between the internal terminal and the external terminal and to securely bite the outer peripheral surface of the protruding portion into the recess of the inner peripheral surface of the through hole.

  In a preferable aspect of the battery disclosed herein, the pressing mechanism includes a tapered opening formed at the tip of the protruding portion and a fitting member fitted into the tapered opening. And in the state which fitted the insertion member in the taper-shaped opening part, it is comprised so that the outer peripheral surface of a protrusion part may be spread and spread to the outer side of radial direction.

  In this way, the battery structure can be simplified by providing the pressing mechanism separately from the terminal structure, but integrally with the internal terminal. Furthermore, the battery weight can be reduced by the volume corresponding to the tapered opening.

  In addition, it is preferable that the said hollow has a shape extended along the insertion direction (protrusion direction) of the protrusion part with respect to a through-hole. In this configuration, the recess has a shape extending in a direction perpendicular to the circumferential direction (that is, the rotation direction) of the internal terminal. Therefore, rotation of the internal terminal can be prevented by biting by caulking, and by extension, the electrode body connected to the internal terminal can be stabilized.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. In addition, this invention is not limited to the following embodiment. Hereinafter, the structure of the battery of the present invention will be described in detail by taking the prismatic lithium ion secondary battery 100 as an example, but the present invention is not intended to be limited to the one described in the embodiment. In addition, the dimensional relationships (length, width, thickness, etc.) in each drawing do not reflect actual dimensional relationships.

  The lithium ion secondary battery 100 (hereinafter also referred to as “battery”) of the present embodiment is typically a predetermined battery constituent material (active material for each of positive and negative electrodes, current collector for each of positive and negative electrodes), as in the case of conventional batteries. , A separator, etc.), and a container for containing the electrode body and an appropriate electrolytic solution.

  As an example, as shown in FIG. 1, a lithium ion secondary battery 100 disclosed herein includes a container 40 having a shape (a rectangular parallelepiped shape in this embodiment) that can accommodate a flat wound electrode body 80 described later. . The material of the container 40 (here, aluminum) is not particularly limited as long as it is the same as that used in the conventional battery. The container 40 is composed of a bottomed box-shaped container body 42 having an open top, and a lid 44 that covers the opening of the container body 42.

  The lid portion 44 of the container 40 is provided with a positive electrode terminal 10 that is electrically connected to the positive electrode of the wound electrode body 80 and a negative electrode terminal 20 that is electrically connected to the negative electrode. The positive electrode terminal 10 includes a positive electrode internal terminal 12 that is disposed inside the container 40 and is connected to the electrode body 80, and a positive electrode external terminal 16 that is disposed outside the container 40 and is connected to the positive electrode internal terminal 12. Similarly, the negative electrode terminal 20 includes a negative electrode internal terminal 22 disposed on the inner side of the container 40 and connected to the electrode body 80, and a negative electrode external terminal 26 disposed on the outer side of the container 40 and connected to the negative electrode internal terminal 22. Yes.

  The materials of the positive electrode terminal 10 (the positive electrode internal terminal 12 and the positive electrode external terminal 16) and the negative electrode terminal 20 (the negative electrode internal terminal 22 and the negative electrode external terminal 26) may be the same as those used in conventional batteries. There is no limit. For example, the positive electrode terminal 10 made from aluminum and the negative electrode terminal 20 made from copper can be used conveniently.

  Further, the terminal structure of the positive electrode terminal 10 will be described with reference to FIGS. FIG. 2 is a schematic cross-sectional view showing a cross-sectional configuration taken along the line II-II in FIG. 3 is a schematic cross-sectional view showing a cross-sectional configuration taken along the line IIIa-IIIa in FIG. However, a part of the members in the container 40 (electrode body 80, etc.) is omitted.

  The positive electrode internal terminal 12 has a protruding portion 14 that protrudes outside the container 40. The protruding portion 14 of the present embodiment is a substantially cylindrical member protruding upward from the container 40 through the opening of the lid portion 44. The positive external terminal 16 has a through hole 18 into which the protruding portion 14 is inserted. The through hole 18 of the present embodiment has a substantially circular shape whose opening shape corresponds to the outer shape of the protruding portion 14. And the protrusion part 14 inserted in the through-hole 18 has the tip 11 crushed (caulking process). That is, the protruding portion 14 is inserted into the through hole 18 and the tip 11 is pressed (applied with pressure), thereby forming the deformed portion 13 and joining to the positive external terminal 16.

  In the present embodiment, the outer peripheral surface 15 of the protrusion 14 and the inner peripheral surface 17 of the through hole 18 are pressed against each other by the above-described crimping. That is, when the protrusion tip 11 is crushed, the outer peripheral surface 15 of the protrusion 14 is expanded radially outward, and the outer peripheral surface 15 and the inner peripheral surface 17 are pressed. A recess 30 is formed on the surface of at least one of the outer peripheral surface 15 of the protruding portion 14 and the inner peripheral surface 17 of the through hole 18 that are pressed against each other.

  The recess 30 of the present embodiment is formed on the inner peripheral surface 17 side of the through hole 18 as shown in FIG. The depression 30 is, for example, a linear longitudinal groove 30. A plurality of the longitudinal grooves 30 are provided continuously in the circumferential direction of the inner peripheral surface 17. The longitudinal groove 30 having such a shape can be easily formed by cutting the inner peripheral surface 17 or the like.

  As shown in FIG. 3 (b), the outer peripheral surface 15 of the protruding portion 14 pressed by the compression (caulking process) is deformed into the plurality of vertical grooves (dents) 30, and some of the vertical grooves (dents) are formed. It bites into the inside of 30. That is, by inserting the protruding portion 14 into the through hole 18 and pressing (applying pressure) to the tip 11 thereof, the outer peripheral surface 15 of the protruding portion 14 bulges outward in the radial direction, and the vertical groove (dent) on the inner peripheral surface 17 ) Cut into 30.

  According to the battery 100 of the present embodiment, the outer peripheral surface 15 of the projecting portion 14 pressed against the notched vertical groove (dent) 30 formed in the inner peripheral surface 17 of the through hole 18 by caulking. Can be transformed. Thereby, the positive electrode internal terminal 12 and the positive electrode external terminal 16 can be firmly joined, and the contact resistance between the positive electrode internal terminal 12 and the positive electrode external terminal 16 can be stabilized.

  Further, the longitudinal grooves (dents) 30 formed in the inner peripheral surface 17 of the through hole 18 are provided so that the formation direction thereof is the insertion direction of the protruding portion 14 (the protruding direction of the protruding portion 14). That is, the vertical grooves (dents) 30 do not extend in the rotation direction (circumferential direction) of the positive electrode internal terminal 12 but extend in a direction perpendicular to the rotation direction (typically linear vertical grooves). ). Therefore, the positive electrode internal terminal 12 can be prevented from rotating by the biting of the protruding portion 14 into the vertical groove (indentation) 30, and the stability of the electrode body 80 connected to the internal terminal 12 is increased.

  In addition, when the dimension of the longitudinal groove (dent) 30 formed in a straight line is illustrated, the width can be about 4% to 20% of the circumferential length, and the depth can be about 50% to 100% of the groove width. However, the vertical groove (depression) 30 may be any size as long as the positive electrode internal terminal 12 can easily bite into the vertical groove (depression) 30 and is suitably suitable according to the configuration conditions of the battery (for example, the material of the internal terminal 12). Can be changed to size. Further, the shape of the recess is not limited as long as the positive electrode internal terminal 12 can easily bite, and is not limited to the vertical groove shape of the present embodiment, and may be other shapes (for example, an ellipse, an ellipse, a polygon, etc.). .

  Further, the number of vertical grooves (indentations) 30 may be one, and a plurality of indentations 30 may be formed on the inner peripheral surface 17 of the through hole 18 as in the present embodiment. However, by providing a plurality of the recesses 30, the bonding between the positive electrode internal terminal 12 and the positive electrode external terminal 16 becomes stronger.

  In the present embodiment, an example in which the recess 30 is provided on the external terminal side (the inner peripheral surface 17 of the through hole 18) is shown, but even if provided on the internal terminal side (the outer peripheral surface 15 of the protruding portion 14). Good. Alternatively, it can be provided on both the internal terminal side and the external terminal side. Even with such a battery structure, the positive electrode internal terminal 12 and the positive electrode external terminal 16 can be firmly bonded as compared with a normal caulking process.

  Hereinafter, the structure of the positive electrode terminal 10 of the battery 100 according to this embodiment will be described in detail with reference to FIG. The battery 100 further includes a pressing mechanism 50 that can press the inner peripheral surface 17 of the through hole 18 and the outer peripheral surface 15 of the protruding portion 14 more strongly in accordance with compression (caulking process). As shown in FIG. 4, the pressing mechanism 50 according to the present embodiment includes a tapered opening 52 formed at the tip 11 of the protruding portion 14, and a fitting member 54 fitted into the tapered opening 52. .

  The tapered opening 52 is a hole provided in the upper surface 11 of the protrusion 14, and the opening shape is substantially circular. The tapered opening 52 of the present embodiment is formed in a lower concavity whose opening diameter decreases from the upper end side to the lower end side.

  The fitting member 54 fitted into the tapered opening 52 is a substantially cylindrical pin 54, and is made of, for example, a ceramic material. The diameter is smaller than the upper end opening diameter of the tapered opening 52 and larger than the lower end opening diameter of the tapered opening 52. Therefore, when the pin 54 is fitted into the tapered opening 52, the pin 54 is press-fitted.

  When the pin 54 is press-fitted into the tapered opening 52, the projecting portion 14 swells in the through hole 18, and the outer peripheral surface 15 is pushed outward in the radial direction (arrow "60"). Thereby, the outer peripheral surface 15 of the protrusion 14 and the inner peripheral surface 17 of the through hole 18 can be pressed. As indicated by the arrow “62”, the pin 54 can be press-fitted simultaneously with the caulking process when the tip 11 of the protruding portion 14 is caulked.

  According to the battery 100 having the above-described configuration, the outer peripheral surface 15 of the protruding portion 14 and the inner peripheral surface 17 of the through hole 18 can be pressed by the pressing mechanism 50, so that the positive electrode internal terminal 12 and The joint with the positive electrode external terminal 16 can be further strengthened. In addition, with this pressing force, the outer peripheral surface 15 of the positive electrode internal terminal 12 can be surely bitten into the vertical groove (dent) 30 on the positive electrode external terminal side. Furthermore, in this embodiment, the pressing mechanism 50 is not provided separately from the positive electrode internal terminal 12 but the pressing mechanism 50 is integrally formed with the positive electrode internal terminal 12, so that the battery structure can be simplified. . Further, the battery weight can be reduced by the volume corresponding to the tapered opening 52.

  In the above-described example, the case where the electrode terminal is the positive electrode terminal 10 has been described. However, even if the electrode terminal is the negative electrode terminal 20, the same effect can be obtained with the same configuration.

  Then, the manufacturing method of the battery 100 is demonstrated, referring each structural material which comprises the battery 100 of this embodiment.

  First, the lid portion 44 of the container 40, the positive electrode internal terminal 12 and the negative electrode internal terminal 22 are prepared, and the protrusion 14 of the positive electrode internal terminal 12 is provided with an opening (not shown) provided in the lid portion 44. The external terminals 16 are sequentially passed through the through holes 18. Then, the tip 11 of the protrusion 14 is crushed and the positive internal terminal 12 and the positive external terminal 16 are connected by caulking. At this time, as shown in FIG. 4, the pin 54 is fitted into the tapered opening 52 in advance, so that the caulking process and the pin press-fitting can be performed simultaneously. That is, as shown by an arrow “62”, the pin 54 is press-fitted by a press at the time of caulking, the positive electrode internal terminal 12 is spread outward in the radial direction, and the positive electrode internal terminal 12 is bitten into the vertical groove (dent) 30. Can do. In the example of FIG. 4, the case of the positive electrode terminal 10 has been described, but the same applies to the case of the negative electrode terminal 20. When penetrating the projecting portion 14 through the opening of the lid portion 44, gaskets 70, 72, and 74 can be disposed between the lid portion 44 and the positive electrode internal terminal 12. The gaskets 70, 72, and 74 can insulate the lid portion 44 and the positive electrode terminal 10, and ensure the hermeticity of the battery 100.

  Next, the positive electrode internal terminal 12 and the negative electrode internal terminal 22 are attached to the electrode body 80. The wound electrode body 80 according to the present embodiment has a sheet-like positive electrode 82 (hereinafter referred to as “positive electrode sheet 82”) and a sheet-like negative electrode 84 (hereinafter referred to as “negative electrode sheet 84”), similarly to a wound electrode body of a normal lithium ion battery. Are laminated together with a total of two sheet-like separators (hereinafter referred to as “separator sheets”), and the positive electrode sheet 82 and the negative electrode sheet 84 are wound with a slight shift, and then the obtained wound body is obtained. This is a flat wound electrode body 80 produced by crushing from the side surface and causing it to be crushed.

  As a result of the winding electrode body 80 being wound in the lateral direction with respect to the winding direction with a slight shift as described above, part of the ends of the positive electrode sheet 82 and the negative electrode sheet 84 are wound core portions (that is, the positive electrode). The portion of the sheet 82 where the positive electrode active material layer is formed, the portion of the negative electrode sheet 84 where the negative electrode active material layer is formed and the separator sheet are closely wound) protrudes outward. The positive electrode internal terminal 12 and the negative electrode internal terminal 22 can be attached to the protruding portion (that is, the portion where the positive electrode active material layer is not formed) and the negative electrode side protruding portion (that is, the portion where the negative electrode active material layer is not formed). In this embodiment, the joining of the positive electrode internal terminal 12 and the positive electrode side protruding portion is performed by ultrasonic welding, and the bonding of the negative electrode internal terminal 22 and the negative electrode side protruding portion is performed by spot welding. It should be noted that the internal terminals 12 and 22 and the protruding portions of the electrodes need only be electrically connected, and may be directly connected as in the present embodiment, or may be connected via other conductive members. May be. In this way, the electrode body 80, the internal terminals (12, 22), and the external terminals (16, 26) can be connected.

In addition, the material and member itself which comprise the winding electrode body 80 may be the same as that of the electrode body of the conventional lithium ion battery, and there is no restriction | limiting in particular. For example, the positive electrode sheet can be formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector. For the positive electrode current collector, an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode is preferably used. As the positive electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include LiMn ₂ O ₄ , LiCoO ₂ , LiNiO _{2 and the} like. For example, an aluminum foil having a length of 2 to 4 m (for example, 2.7 m), a width of 8 to 12 cm (for example, 10 cm), and a thickness of about 5 to 20 μm (for example, 15 μm) is used as a current collector. A positive electrode active material layer for lithium ion batteries mainly composed of lithium nickelate is formed by a conventional method (for example, lithium nickelate 88% by mass, acetylene black 10% by mass, polytetrafluoroethylene 1% by mass, carboxymethylcellulose 1% by mass). Thus, a suitable positive electrode sheet can be obtained.

  On the other hand, the negative electrode sheet can be formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector. For the negative electrode current collector, a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used. As the negative electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include carbon-based materials such as graphite carbon and amorphous carbon, lithium-containing transition metal oxides and transition metal nitrides. For example, a copper foil having a length of 2 to 4 m (for example, 2.9 m), a width of 8 to 12 cm (for example, 10 cm), and a thickness of about 5 to 20 μm (for example, 10 μm) is used. A suitable negative electrode sheet is obtained by forming a negative electrode active material layer for lithium ion batteries (for example, 98% by mass of graphite, 1% by mass of styrene butadiene rubber, 1% by mass of carboxymethyl cellulose).

  Moreover, what was comprised with porous polyolefin resin as a suitable separator sheet used between positive and negative electrode sheets is mentioned. For example, a porous separator sheet made of synthetic resin (for example, made of polyolefin such as polyethylene) having a length of 2 to 4 m (for example, 3.1 m), a width of 8 to 12 cm (for example, 11 cm), and a thickness of about 5 to 30 μm (for example, 25 μm). It can be preferably used. When a solid electrolyte or a gel electrolyte is used as the electrolyte, there may be a case where a separator is unnecessary (that is, in this case, the electrolyte itself can function as a separator).

  The electrode body housed in the battery container is not limited to the wound type. For example, it may be a laminated type electrode body in which a positive electrode sheet and a negative electrode sheet are alternately laminated together with a separator (or a solid or gel electrolyte that can also function as a separator).

  Subsequently, the electrode body 80 is accommodated in the container 40 together with the internal terminals (12, 22), and the upper end opening of the container 40 is sealed with the lid portion 44. The material of the container 40 is not particularly limited as long as it is the same as that used in the conventional unit cell, but a relatively light material can be used. For example, a metal (for example, aluminum) container whose surface is preferably coated with an insulating resin coating, a polyolefin resin such as polypropylene, or another synthetic resin container is preferable.

  After the wound electrode body 80 is accommodated in the container 40, the electrolytic solution is subsequently injected from a liquid injection port (not shown) formed in the lid portion 44 of the container 40. In this embodiment, a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent is injected. Examples of the non-aqueous solvent constituting the electrolyte include ethylene carbonate, propylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC), 1,2-dimethoxyethane, 1,2-diethoxyethane, and tetrahydrofuran. One, two or more selected from the group consisting of 1,3-dioxolane and the like can be used. In the sealed battery according to this example, a mixed solvent of diethyl carbonate and ethylene carbonate (for example, a mass ratio of 1: 1) is used.

Moreover, as the electrolyte (supporting salt) constituting this electrolytic solution, one or two or more selected from various lithium salts containing fluorine as a constituent element can be used. For example, one type selected from the group consisting of LiPF ₆ , LiBF ₄ , LiASF ₆ , LiCF ₃ SO ₃ , LiC ₄ F ₉ SO ₃ , LiN (CF ₃ SO ₂ ) ₂ , LiC (CF ₃ SO ₂ ) _3, or the like Two or more types can be used. In the sealed battery according to this example, lithium hexafluorophosphate (LiPF ₆ ) is used as the electrolyte. Its concentration is about 1 mol / liter.

  The battery 100 of this embodiment is constructed by injecting the electrolytic solution from the injection port and then inserting a sealing plug (not shown) into the injection port and sealing.

  The assembled battery 92 can be constructed by arranging the batteries 100 thus manufactured in a predetermined direction and restraining the batteries 100 in the arrangement direction. Each battery constituting the assembled battery 92 is connected to each other via a conductive member (typically a bus bar). The conductive member (bus bar) is attached to the positive external terminal and the negative external terminal via a fastening member (typically a screw). According to the battery configuration of the present embodiment, since the external terminal and the internal terminal can be firmly joined by providing the recess 30, it is possible to avoid a situation in which the external terminal rotates with a fastening torque when fastening the bus bar, Damage to the electrode body can be avoided.

  The assembled battery 92 constructed in this way can be suitably used as a power source for a motor (electric motor) mounted on a vehicle such as an automobile. Therefore, in the present invention, as schematically shown in FIG. 5, a vehicle (typically, an automobile equipped with an electric motor such as an automobile, particularly a hybrid automobile, an electric automobile, or a fuel cell automobile) provided with such an assembled battery 92 as a power source. 90 can be provided.

  As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, the type of the sealed battery is not limited to the above-described lithium ion battery, but batteries with various contents having different electrode body constituent materials and electrolytes, such as lithium secondary batteries having a negative electrode made of lithium metal or a lithium alloy, nickel metal hydride batteries, It may be a nickel cadmium battery or an electric double layer capacitor (that is, a physical battery).

The side view which shows typically the battery 100 which concerns on this embodiment. The schematic diagram which shows typically the II-II cross section of FIG. (A) is a schematic diagram which shows typically the IIIa-IIIa cross section of FIG. 2, (b) is a principal part enlarged view of (a). Sectional drawing which shows typically the crimping process process which concerns on this embodiment. The side view which shows typically the vehicle 90 of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Positive electrode terminal 11 Tip 12 Positive electrode internal terminal 13 Deformation part 14 Protrusion part 15 Outer peripheral surface 16 Positive electrode external terminal 17 Inner peripheral surface 18 Through-hole 20 Negative electrode terminal 22 Negative electrode internal terminal 26 Negative electrode external terminal 30 Depression 40 Container 42 Container main-body part 44 Cover Part 50 pressing mechanism 52 tapered opening 54 fitting member 80 wound electrode body 82 positive electrode sheet 84 negative electrode sheet 90 vehicle 92 assembled battery 100 battery

Claims (6)

A battery comprising an electrode body including a positive electrode and a negative electrode, and a container containing an electrolyte together with the electrode body,
An internal terminal connected to the electrode body and having a protruding portion protruding to the outside of the container;
An external terminal disposed on the outside of the container and connected to the protruding portion of the internal terminal;
The external terminal has a through hole into which the protruding portion of the internal terminal can be inserted,
The protruding portion of the internal terminal is crimped with its tip inserted into the through-hole,
A recess in which at least one of the outer peripheral surface of the protrusion and the inner peripheral surface of the through hole pressed against each other by the caulking can be deformed and bite by deformation of the other surface pressed by the caulking. A battery characterized by being formed. A plurality of the depressions are provided on the inner peripheral surface of the through hole,
2. The battery according to claim 1, wherein an outer peripheral surface of the protruding portion pressed by the caulking is deformed and bites into the plurality of depressions.   The battery according to claim 2, further comprising a pressing mechanism that presses the outer peripheral surface of the protruding portion and the inner peripheral surface of the through-hole with the caulking. The pressing mechanism includes a tapered opening formed at the tip of the projecting portion, and a fitting member fitted into the tapered opening.
4. The battery according to claim 3, wherein an outer peripheral surface of the projecting portion is configured to be spread outward in a radial direction in a state where the insertion member is fitted into the tapered opening. 5. .   5. The battery according to claim 1, wherein the recess has a shape extending along an insertion direction of the protrusion with respect to the through-hole.   A vehicle comprising the battery according to any one of claims 1 to 5.

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