JP6032302B2 - battery - Google Patents

Description

  The present invention relates to a battery characterized by a sealing structure at a connection portion of external terminals, that is, an outer packing structure.

  Conventionally, a configuration in which a rivet terminal is attached to a cover plate via an external insulation prevention plate is known as a battery (see, for example, Patent Document 1). The external insulation prevention plate is formed with a square recess on the outer surface, and a protrusion having a through hole on the inner surface on the opposite side. The rectangular recess holds the flange portion of the rivet terminal, and the current collecting rivet portion of the rivet terminal is inserted into the through hole. The current collecting rivet portion is clamped by penetrating the cover plate, the insulation prevention plate, and the current collecting connection body, thereby fixing these members.

JP 2003-157812 A

  However, in the conventional battery, the external insulating plate is only in contact with the upper surface of the flat lid, and has no structure for restricting movement in the rotational direction. For this reason, when the rivet terminal is attached, the external insulating plate may be displaced in the rotational direction, which makes the assembly work troublesome.

  An object of the present invention is to provide a battery in which an outer packing for insulating a lid and an external terminal attached thereto can be easily attached in spite of a simple structure.

As a means for solving the above problems, the present invention provides:
A battery container having an opening on one surface; a power generation element housed in the battery container; and a lid for closing the opening; and an external terminal exposed to the outside on the outer surface of the lid. A battery arranged via an outer packing,
The lid is formed with an engagement receiving portion that protrudes outward and has a shape other than circular in plan view.
The outer packing is formed on one side across the partition and is mounted on the engagement receiving portion, and the terminal holding recess is formed on the other side across the partition and the external terminal is disposed. Is formed at the overlapping position in plan view .

  With this configuration, when the external terminal is attached to the lid body, the mounting recess of the outer packing is mounted on the engagement receiving portion formed on the lid body, and displacement in the rotational direction is prevented. Therefore, it is possible to efficiently perform the external terminal mounting operation.

  The external body and the current collector connected to the power generation element are attached to the lid body via the outer packing and the inner packing, respectively, and one end portion is the outer packing, the lid body, and the inner body. A packing and a rivet having a collar portion at the other end are caulked through the current collector.

  With this configuration, in the outer packing, the engagement receiving portion formed on the lid body is positioned in the mounting recess, and the displacement in the rotation direction is prevented. Therefore, when assembling the outer packing, lid, inner packing, and current collector with rivets, it is not necessary to worry about the positional deviation of the outer packing, and workability can be improved. Become.

  The outer packing may be provided with the concave portion and a concave portion in which the flange portion of the external terminal is disposed by partitioning the cylindrical body with a partition wall.

The lid body is formed with a locking portion on the outer surface,
A tongue piece extending along the lid is formed on the outer packing, and the tongue piece is engaged with the engagement portion in a state where the outer packing is attached to the engagement receiving portion of the lid. It is preferable to provide a stop part.

  With this configuration, it is possible to further prevent displacement of the outer packing in the rotation direction by locking the locking receiving portion of the tongue piece to the locking portion of the lid.

  According to the present invention, the engagement receiving portion having a shape other than circular in plan view is formed on the lid, and the mounting recess of the outer packing is attached to the engagement receiving portion. The outer packing is not displaced during work, and workability can be improved.

It is a perspective view of the battery which concerns on this embodiment. It is front sectional drawing of the battery which concerns on this embodiment. It is a perspective view which shows the state which looked at the cover body of FIG. 1 from the upper side. FIG. 4 is an exploded perspective view of FIG. 3. It is the perspective view which shows the state which looked at the cover body of FIG. 1 from the downward side, and its partial expanded sectional view. FIG. 6 is an exploded perspective view of FIG. 5. It is sectional drawing which shows the manufacturing process of the negative electrode terminal of FIG.

  Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the following description, terms indicating specific directions and positions (for example, terms including “up”, “down”, “side”, “end”) are used as necessary. Is for facilitating understanding of the invention with reference to the drawings, and the technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a non-aqueous electrolyte secondary battery. As shown in FIG. 2, the non-aqueous electrolyte secondary battery is one in which a power generation element 2 is accommodated in a battery container 1 and sealed with a lid 3. Here, the battery case 1 and the lid 3 constitute an exterior body.

  The battery case 1 has a rectangular parallelepiped shape whose upper surface is open, and is made of aluminum, an aluminum alloy, or the like.

  Although not shown in detail for the power generating element 2, a separator 6 made of a porous resin film is disposed between a negative electrode 4 made of a copper foil and a positive electrode 5 made of an aluminum foil, as in the prior art. These are all belt-like, and are wound in a flat shape so that they can be accommodated in the battery container 1 with the negative electrode 4 and the positive electrode 5 shifted from the separator 6 on the opposite sides in the width direction. ing. As will be described later, a negative electrode current collector 18 is connected to the negative electrode 4 and a positive electrode current collector 19 is connected to the positive electrode 5 via the clip 7.

  As shown in FIGS. 3 to 6, the lid 3 is a long metal plate having a rectangular shape in plan view, and a substantially elliptical opening 8 that is stepped from the upper surface side is formed at the center. A rubber safety valve 9 is mounted there. The safety valve 9 is formed with a substantially H-shaped thin portion so that when the internal pressure rises abnormally, the thin portion can be torn and decompressed.

  A small-diameter liquid injection hole 10 is formed on one end side of the lid 3 and is closed by a plug body 11 after the liquid injection.

  An engagement receiving portion 12 having a substantially rectangular shape in plan view that bulges upward is formed on the lower surface of both end portions of the lid 3, and each engagement receiving portion 12 has one side of the engagement recess 12 a on the lower surface side. Shallow guide recesses 12b are formed around the periphery of each other. Moreover, the through-hole 12c is formed in the center part of the ceiling surface which comprises the engagement recessed part 12a, respectively. A current collector 13 and an external terminal 14 are attached to the engagement receiving portion 12 and the guide recess 12b via an upper packing 15 and a lower packing 16, respectively.

  The lid 3 is formed with locking projections 17 projecting upward from two locations in the width direction in the vicinity of the inside of each engagement receiving portion 12. Each locking projection 17 has a bottomed cylindrical shape, and is formed at the same time when the lid 3 is pressed. An upper packing 15 to be described later is locked to each locking protrusion 17 to perform positioning in the rotational direction.

  The current collector 13 includes a copper negative electrode current collector 18 and an aluminum positive electrode current collector 19. Each of these current collectors 13 is formed by pressing a long metal plate material to form a connection receiving portion 20 and leg portions 21 extending from both sides thereof. The connection receiving part 20 is comprised by the fitting part 22 arrange | positioned in the recessed part of the said cover body 3, and the base part 23 following this. The fitting portion 22 has a planar shape, a through hole 22a is formed in the center portion, and a guide edge portion 24 extending in a direction orthogonal to the periphery except for one side continuous to the pedestal portion 23 is formed. The side is a continuous portion 25 that extends further than the guide edge portion 24 and reaches the pedestal portion 23. The rigidity of the connection receiving portion 20 of the current collector 13 is sufficiently enhanced by the guide edge portion 24 and the continuous portion 25.

  The leg portion 21 extends in a direction orthogonal to both side edge portions of the pedestal portion 23, and is disposed along both side surfaces of the power generation element 2. And the leg part 21 is connected to the positive electrode 5 or the negative electrode 4 of the power generation element 2 via the clip 7, and the clip 7 is sandwiched between the opposed inner surfaces of the battery container 1 to prevent displacement. .

  The external terminal 14 includes a negative electrode external terminal 28 and a positive electrode external terminal 29, and includes a flat plate portion 30 and a shaft portion 31 extending downward from the center portion of the lower surface thereof. A bus bar (not shown) is connected to the surface (exposed surface) of the flat plate portion 30 by welding.

  As shown in FIG. 7, the negative electrode external terminal 28 can be formed by an aluminum plate 32 having a rectangular shape in plan view and a copper rivet 33. That is, the shaft portion 33a of the rivet 33 is inserted into the through hole 32a formed in the central portion of the plate-like body 32, and the flange portion 33b is press-fitted into the through hole 32a by press working. The inner diameter dimension of the through hole 32a of the plate-like body 32 is only slightly larger than the outer diameter dimension of the shaft portion 33a of the rivet 33, and is sufficiently smaller than the outer diameter dimension of the flange portion 33b. Therefore, the press-fitting causes the flange portion 33b to expand the through hole 32a to be in a crimped state, and the expanded portion is crimped to the shaft portion 33a so that they are integrated. A circular recess 33 c is formed at the center of the tip surface of the shaft portion 33 a of the rivet 33. Then, as described later, after the shaft portion 33a is inserted into the through holes of the upper packing 15, the engagement receiving portion 12 of the lid 3, the lower packing 16, and the negative electrode current collector 18, these are inserted. The squeezing is fixed by expanding the recess 33c so as to be sandwiched.

  The upper packing 15 is made of a synthetic resin in which a frame body having a rectangular shape in a plan view is divided into an upper terminal holding recess 37 and a lower mounting recess 38 by a partition wall 36, and constitutes a lower opening edge. One side is a tongue piece 39 extending further to the side. A cylindrical portion 36 a extending downward from the ceiling surface is formed at the central portion of the partition wall 36. The tubular portion 36 a is inserted through the through hole 12 c of the engagement receiving portion 12 and is fitted into the through hole 40 a of the lower packing 16. The tongue piece 39 is formed with two locking holes 39a through which the locking projection 17 of the lid 3 is inserted. The upper packing 15 is along the engagement receiving portion 12 of the lid body 3 formed in a rectangular shape in plan view, and the displacement in the rotational direction is prevented only by being placed on the engagement receiving portion 12. Moreover, by inserting the locking projection 17 into the locking hole 39a, the positional deviation in the rotational direction is reliably prevented.

  The lower packing 16 has a rectangular plate shape in plan view, and is made of rubber having a through hole 16a formed at the center. The shape of the lower packing 16 is slightly different between the negative electrode side and the positive electrode side.

  The negative side lower packing 16 </ b> A includes a bulging portion 40 disposed in an engagement recess 12 a formed in the engagement receiving portion 12 of the lid 3, and a flat portion 41 continuous with the bulging portion 40. Yes. The bulging portion 40 has a shape along the inner surface of a portion excluding one side of the engagement recess 12a of the engagement receiving portion 12, and a through hole 40a is formed in the central portion. The flat portion 41 is disposed in the guide recess 12 b of the engagement receiving portion 12. The negative electrode side lower packing 16 </ b> A is disposed from the lower side with respect to the engagement recess 12 a constituting the engagement receiving portion 12 of the lid body 3, and is sandwiched between the lid body 3 and the negative electrode external terminal 28. In this sandwiched state, the negative electrode external terminal 28 and the lid 3 are insulated, and the through-hole 12 c formed in the engagement receiving portion 12 of the lid 3 together with the upper packing 15 is sealed.

  On the other hand, the positive side lower packing 16 </ b> B has a flat plate shape, and a through hole 16 a is formed in the center portion, and is disposed in the engagement concave portion 12 a constituting the engagement receiving portion 12. The positive side lower packing 16B seals the through hole 12c formed in the engagement receiving portion 12 of the lid 3 together with the upper packing 15.

  According to the battery having the above configuration, the displacement in the rotational direction can be prevented only by mounting the mounting recess 38 of the upper packing 15 on the engagement receiving portion 12 of the lid 3. Accordingly, when the shaft portion 31 of the external terminal 14 is inserted into the through holes of the upper packing 15, the lid body 3, the lower packing 16, and the current collector 13 and fixed by crimping, the upper packing 15 is displaced. There is nothing. For this reason, it becomes possible to improve workability of these series of assembly operations.

In addition, this invention is not limited to the structure described in the said embodiment, A various change is possible.
For example, the upper packing 15 is not limited to a rectangular shape in plan view, and may have various shapes in a plan view other than a circle, such as a triangle, a pentagon or more polygon, and an ellipse. In short, any configuration that can prevent positional deviation in the rotational direction when the upper packing 15 is mounted may be used. Depending on the case, it does not need to match the shape of the engagement receiving portion 12 of the lid 3.
Moreover, although the shape of the battery container 1 is a rectangular parallelepiped shape, the engagement receiving portion 12 and the upper packing 15 of the lid 3 having the above-described configuration can be adopted even if the shape is a cylindrical shape or the like. It is.

  The structure of the external terminal 14 of the battery according to the present invention can be employed in various batteries such as a lead storage battery in addition to a lithium ion battery.

DESCRIPTION OF SYMBOLS 1 ... Battery container 2 ... Power generation element 3 ... Cover body 4 ... Negative electrode 5 ... Positive electrode 6 ... Separator 7 ... Clip 8 ... Opening part 9 ... Safety valve 10 ... Injection hole 11 ... Plug body 12 ... Engagement receiving part 12a ... Engagement Recessed portion 12b ... Guide recessed portion 12c ... Through hole 13 ... Current collector 14 ... External terminal 15 ... Upper packing (outer packing)
16 ... Lower packing (inner packing)
16a ... Through hole 16A ... Negative electrode side lower packing 16B ... Positive electrode side lower packing 17 ... Locking projection 18 ... Negative electrode current collector 19 ... Positive electrode current collector 20 ... Connection receiving part 21 ... Leg part 22 ... Fitting part 22a ... Through hole 23 ... pedestal portion 24 ... guide edge 25 ... continuous portion 28 ... negative electrode external terminal 29 ... positive electrode external terminal 30 ... flat plate portion 31 ... shaft portion 32 ... plate-like body 32a ... through hole 33 ... rivet 33a ... shaft portion 33b鍔 part 34 ... plate-like body 34 a ... concave part 35 ... rivet 35 a ... butt part 35 b ... shaft part 36 ... partition wall 36 a ... through hole 37 ... terminal holding concave part 38 ... mounting concave part 39 ... tongue piece 39a ... locking hole 40 ... swelling Protruding part 41 ... Flat part

Claims (2)

A battery container having an opening on one surface; a power generation element housed in the battery container; and a lid for closing the opening; and an external terminal exposed to the outside on the outer surface of the lid. A battery arranged via an outer packing,
The lid is formed with an engagement receiving portion that protrudes outward and has a shape other than circular in plan view.
The outer packing is formed on one side across the partition and is mounted on the engagement receiving portion, and the terminal holding recess is formed on the other side across the partition and the external terminal is disposed. Is formed at a position overlapping in plan view . The lid is attached with the current collector connected to the external terminal and the power generation element via the outer packing and the inner packing, respectively.
The battery according to claim 1, further comprising a rivet having one end portion caulked through the outer packing, the lid, the inner packing, and the current collector and having a flange portion at the other end portion.

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