JP2011243559A - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
JP2011243559A
JP2011243559A JP2011014405A JP2011014405A JP2011243559A JP 2011243559 A JP2011243559 A JP 2011243559A JP 2011014405 A JP2011014405 A JP 2011014405A JP 2011014405 A JP2011014405 A JP 2011014405A JP 2011243559 A JP2011243559 A JP 2011243559A
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Prior art keywords
battery
flange
convex
shaft
battery lid
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JP2011014405A
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JP5509111B2 (en
Inventor
Hideyuki Shibanuma
Kazuaki Urano
英幸 柴沼
和昭 浦野
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Hitachi Vehicle Energy Ltd
日立ビークルエナジー株式会社
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Abstract

To provide a secondary battery that does not leak for a long period of time and has excellent vibration resistance and durability.
A connection pin has a first shaft portion that is inserted through a through hole of a battery lid and a flange portion that is formed below the shaft portion and is disposed in the battery can. The gasket 2 has a cylindrical portion 2a through which the first shaft portion 5b of the connection pin 5 is inserted, and a flange portion 2b formed below the cylindrical portion 2a. One side of 2b is in contact with the back surface of the battery lid 1, and the other side is in contact with and pressed against the flange portion 5a of the connection pin 5. An annular first convex portion having a diameter smaller than the outermost peripheral diameter of the gasket 2 and a second annular portion on the inside thereof are formed on the flange portion 5a side of the connection pin 5 that is pressed against the other surface side of the flange portion 2b of the gasket 2. And a convex portion.
[Selection] Figure 2

Description

  The present invention relates to a secondary battery, and in particular, a battery can that houses a power generation element, a battery lid that seals an opening of the battery can, an external conductive member that is inserted through a through hole formed in the battery lid, The present invention relates to a secondary battery including a seal member sandwiched between a battery lid and an external lead-out terminal in a through hole.

  In recent years, in response to social trends in global environmental protection, there is an urgent need for practical use and diffusion of secondary batteries for driving vehicles such as hybrid vehicles and electric vehicles. The structure of the secondary battery for driving a vehicle includes a power generation element group in which a positive electrode plate and a negative electrode plate are arranged via a separator, and an electrolyte solution that infiltrates the power generation element group is made of metal or resin, and a battery can and a battery lid. The one provided with an external terminal that is housed in a sealed container constituted by and electrically connected to both poles of the power generation element group is widely known.

  Until now, most of secondary batteries put into practical use have a cylindrical outer shape. However, in the case of a secondary battery for driving a vehicle, in order to improve the output and capacity, when several to several tens, it is necessary to combine more than a hundred secondary batteries into an assembled battery and mount it on one vehicle. . Therefore, in order to improve the mounting density (volume capacity density), the practical use of the square-shaped secondary battery has been studied.

  Such a secondary battery is configured as follows, for example. The secondary battery has a metal battery can formed with a depth dimension larger than the dimension of the short side of the opening by a deep drawing method. The battery can accommodates a power generation element group infiltrated with the electrolytic solution. In the power generation element group, positive and negative electrode plates having current collecting foil are wound or laminated, and uncoated portions of the positive and negative electrode mixture are respectively formed at both ends. The electrode plates are joined to the uncoated parts by ultrasonic waves or the like at the joints. A metal battery lid is disposed in the opening of the battery can. A positive terminal and a negative terminal for connection to the outside are fixed to the battery cover via a sealing member (for example, a gasket) for avoiding electrical contact with the battery cover and maintaining airtightness inside the battery. Has been. The positive and negative terminals are caulked, and are caulked to the battery lid together with the external terminals with a screw shaft or the like interposed therebetween. The opening of the battery can is sealed with a battery lid by laser beam welding or the like. After the electrolytic solution is injected into the battery can from the liquid injection port, the liquid injection port is hermetically sealed with a liquid injection plug by laser beam welding or the like (see, for example, Patent Document 1).

  The seal portion of the seal member is pressed by a convex portion (protrusion) in order to prevent leakage of the electrolytic solution. As the shape of the convex portion, a round shape (for example, refer to Patent Document 2) and an elliptical shape (for example, refer to Patent Document 3) have been adopted so far. ) Is a single ring (monocyclic).

JP 2009-129719 A JP 1997-153351 A JP 2008-251213 A

  However, in the conventional secondary battery, since the convex shape that presses the seal portion of the seal member is a single ring shape, the pressure against the seal member is reduced due to the creep phenomenon of the seal member (a phenomenon in which the surface pressure is reduced). Leakage was likely to occur and there was a problem with durability. In particular, a secondary battery mounted on a moving body such as an automobile is required to have reliability against liquid leakage at the terminal portion due to the characteristics of the application.

  An object of the present invention is to provide a secondary battery that does not cause liquid leakage for a long period of time and has excellent vibration resistance and durability.

  In order to solve the above problems, the present invention provides a power generation element group in which a positive electrode plate and a negative electrode plate are arranged via a separator, an electrolyte solution infiltrating the power generation element group, and a battery containing the power generation element group and the electrolyte solution. An outer conductive member electrically connected to each of the can, the battery lid for sealing the opening of the battery can, and the positive and negative plates of the power generation element group, and inserted into a through hole formed in the battery lid And a seal member sandwiched between the battery lid and the external lead-out terminal in the through hole, and the external conductive member is disposed on one side of the shaft portion and the shaft portion inserted into the through hole. A flange portion formed in the battery can, and the seal member is formed on a cylindrical portion into which the shaft portion of the external conductive member is inserted and on one side of the cylindrical portion. A flange portion, and one surface side of the flange portion is the battery. Of the external conductive member or the flange portion of the seal member which is in pressure contact with the other surface side of the flange portion of the seal member. An annular or rectangular first convex portion smaller than the outermost periphery of the seal member and an annular or rectangular second convex portion on the inner side are provided on the back surface side of the battery lid that is in pressure contact with the one surface side. It is characterized by that.

  In the present invention, at least a part of one of the first and second convex portions of the annular or rectangular portion may be missing. It is preferable that the peripheral portion on the back side of the battery lid in which the through hole is formed is thinned, and one surface side of the flange portion of the seal member is in contact with the thinned back surface of the battery lid. The first and second convex portions project from the flange portion side of the external conductive member toward the other surface side of the flange portion of the seal member, and the second convex portion is connected to the shaft portion of the external conductive member. Or the first and second convex portions project from the back side of the battery lid toward the one surface side of the flange portion of the seal member, and the first convex portion It is formed integrally with the back surface of the battery lid, and the end portion that presses the one surface side of the flange portion of the sealing member on the back surface side of the integrally formed battery lid may constitute the first convex portion. Good. In the latter aspect, it is preferable that the outer periphery of the flange portion of the external conductive member has a larger diameter than the outer periphery of the first convex portion. Furthermore, in order to improve the sealed state of the secondary battery, the battery can and the battery lid are made of metal, and the external conductive member further has a caulking portion disposed on the other side of the shaft portion and outside the battery lid. The external conductive member may be fixed to the battery lid by caulking a caulking portion via an insulating member that contacts the battery lid and an external terminal supported by the insulating member. At this time, the external conductive member penetrates the insulating member and the external terminal, and the diameter of the portion of the external conductive member that penetrates the external terminal is more preferably smaller than the diameter of the shaft portion of the external conductive member.

  According to the present invention, from the outermost periphery of the seal member to the flange portion side of the external conductive member that is in pressure contact with the other surface side of the flange portion of the seal member or the back surface side of the battery lid that is in pressure contact with the one surface side of the flange portion of the seal member. A small annular or rectangular first convex portion and an annular or rectangular second convex portion on the inside thereof, so that the seal surrounded between the first convex portion and the second convex portion is provided. The seal portion of the member has an effect that the pressure on the seal member is increased without flowing and the speed of the pressure decrease is slow, so that liquid leakage does not occur for a long period of time.

It is a disassembled perspective view of the secondary battery of 1st Embodiment which can apply this invention. It is a fragmentary sectional view of the negative electrode terminal part of the secondary battery of a 1st embodiment. It is a disassembled perspective view of the negative electrode terminal part of the secondary battery of 1st Embodiment. FIG. 3 is a partially enlarged view of FIG. 2. It is a characteristic diagram showing the relationship between the compression amount of a gasket and a seal surface pressure. It is a characteristic diagram showing the relationship between the gasket time and the seal surface pressure retention. It is a fragmentary sectional view of the negative electrode terminal part of the secondary battery which can change in a 1st embodiment. It is a top view of the flange part of the connecting pin of the secondary battery of another mode which can change in a 1st embodiment, (A) is in the state where the 1st convex part is missing, and (B) is the 2nd A state in which a part of the convex portion is missing is shown. It is a top view of the flange part of the connection pin of the secondary battery of another mode which can change in a 1st embodiment, and (A) is a part of the 1st convex part and the 2nd convex part missing The state which exists, (B) shows the state from which the 1st convex part and the 2nd convex part are missing at two places, respectively. It is a fragmentary sectional view of the negative electrode terminal part of the secondary battery of a 2nd embodiment to which the present invention is applicable. It is the elements on larger scale of FIG. It is a fragmentary sectional view of the negative electrode terminal part of the secondary battery which can be changed in the 1st and 2nd embodiments.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to a rectangular lithium ion secondary battery for a hybrid vehicle will be described with reference to the drawings. Note that one of the features of the secondary battery of the present embodiment is that airtightness is achieved by providing a double ring convex portion (hereinafter referred to as a bicyclic convex portion) on the flange portion 5a of the connecting pin 5 that compresses the gasket 2. (See FIG. 2).

(Constitution)
<Overall battery configuration>
As shown in FIG. 1, the secondary battery of this embodiment is a deep drawing with a square shape in which a power generation element group (electrode group) 11 is infiltrated with a non-aqueous electrolyte (not shown) and corners are provided with R. It is accommodated in a bottomed metal (in this example, aluminum alloy) battery can 20 having a depth dimension larger than the short side dimension of the opening. Between the power generation element group 11 and the battery can 20, an insulating case 21 made of resin (in this example, made of polypropylene) that is slightly smaller than the inside of the battery can 20 is interposed in order to prevent electrical contact between them. ing.

  The power generation element group 11 of the present embodiment has a flat wound structure in which a separator, a negative electrode plate, a separator, and a positive electrode plate are stacked in order and wound into a flat shape. A separator is wound several times around the winding start end (the shaft core is not provided for lightening), and the separator is wound around the winding end end for one or two turns. In order to prevent this, the winding end of the separator is stopped with a tape coated with an adhesive on one side in advance.

  In the negative electrode plate, a negative electrode active material mixture containing a carbon material such as graphite capable of occluding and releasing lithium ions as a negative electrode active material is applied to both sides of a copper alloy foil (negative electrode current collector) substantially uniformly and substantially uniformly. The negative electrode uncoated part 11a where the negative electrode active material mixture is not coated is formed on one side along the longitudinal direction on both surfaces. On the other hand, in the positive electrode plate, the positive electrode active material mixture containing, for example, a lithium-containing transition metal double oxide such as lithium manganate as the positive electrode active material on both surfaces of the aluminum alloy foil (positive electrode current collector) is substantially equal and substantially the same. A positive electrode uncoated portion 11b in which the positive electrode active material mixture is not coated is formed on one side along the longitudinal direction on both sides. The separator is made of a microporous sheet material through which lithium ions can pass. In this example, a polyethylene sheet having a thickness of several tens of μm is used.

  The negative electrode uncoated portion 11a and the positive electrode uncoated portion 11b are arranged on opposite sides of the power generation element group 11, and the central portion thereof is the main surface (surface having the largest area) of the power generation element group 11. However, they are bent and gathered at a gentle angle toward a virtual plane passing through the center of the flat wound structure. After arranging the negative electrode current collector plate 7 and the positive electrode current collector plate 8 made of copper alloy and aluminum alloy on both sides of the collected negative electrode uncoated portion 11a and positive electrode uncoated portion 11b, respectively, By performing welding, the negative electrode bonding portion 7a in which the negative electrode uncoated portion 11a and the negative electrode current collector plate 7 are bonded, and the positive electrode bonding portion in which the positive electrode uncoated portion 11b and the positive electrode current collector plate 8 are bonded. 8a is formed.

  A battery lid assembly 10 is disposed on the power generation element group 11. The battery lid assembly 10 includes a plate-shaped battery lid 1 made of an aluminum alloy, a negative electrode terminal portion 15 electrically connected to the negative electrode joint portion 7a, a positive electrode terminal portion 16 electrically connected to the positive electrode joint portion 8a, and a battery. It is composed of an injection plug 23 that is formed on the lid 1 and seals the injection port 22 for injecting an electrolyte solution, and a cleavage valve 25 that cleaves at a predetermined pressure when the battery internal pressure rises. .

  The battery lid 1 is composed of a flat plate having a size matching the opening of the battery can 20 (R-attached to the battery can 20), and for the external lead out of the negative electrode in order from the right side of FIG. Three through-holes are formed: a through-hole 1a (see FIG. 3, round hole in this example), an injection hole 22, a through-hole for attaching a cleavage valve, and a through-hole for leading out of the positive electrode . The ellipse-shaped cleavage valve 25 has a weak portion such as a groove formed integrally with the battery lid 1 at the center. Note that the through hole for leading out of the negative electrode (and leading out of the positive electrode) will be described later. The battery lid 1 has a contour matching the battery can 20 joined by laser beam welding so as to seal the opening of the battery can 20.

The power generation element group 11 is infiltrated with the electrolyte injected through the liquid injection port 22, and the power generation element group 11 and the electrolyte constituting the power generation element are accommodated in the battery can 20. It is sealed. As the electrolytic solution, for example, a solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate organic solvent such as ethylene carbonate at a rate of about 1 mol / liter is used. Can do.

<Terminal part and terminal part sealing structure>
As shown in FIGS. 2 to 4, the negative terminal portion 15 includes a rivet-shaped connection pin 5, a gasket 2 sandwiched between the battery lid 1 and the connection pin 5 in the through hole 1 a, a resin insulating member 3, It comprises a square head bolt 12 for fixing a bus bar (a connecting member for connecting cells) not to be used and a plate-like external terminal 4.

  The connection pin 5 is made of an aluminum alloy for the positive electrode and made of a copper alloy for the negative electrode, and is formed on the first shaft portion 5b (see FIG. 2) inserted through the through hole 1a and below the first shaft portion 5b. A circular flange portion 5a and a cylindrical portion for fixing (by machining) a conductive member 9 made of an aluminum alloy and a negative electrode made of a copper alloy on the lower side of the flange portion 5a. (The shape after caulking is shown as caulking portion 5e in FIG. 2 and not shown in FIG. 3), and the portion that penetrates external terminal 4 and has a diameter smaller than the diameter of first shaft portion 5b. 2 and a cylindrical portion (on FIG. 2, the shape after caulking portion 5d is caulked and fixed to caulking and fixing insulating member 3 and external terminal 4 to battery lid 1). And the shape before caulking is shown in FIG. That. In addition, the outer diameter of this cylindrical part is set to the same diameter as the 2nd axial part 5c.

  The conductive member 9 is made of an aluminum alloy for the positive electrode and made of a copper alloy for the negative electrode. One end of the conductive member 9 is joined to the negative joint 7a, and the caulking portion 5e of the connection pin 5 is formed in a round hole formed on the other end. The conductive member 9 and the connection pin 5 are electrically insulated from the battery lid 1 via the insulating member 3 and the gasket 2 by being caulked after the cylindrical portion to be inserted is inserted (see FIG. 2). Thus, they are electrically and mechanically connected (see FIG. 3).

  The gasket 2 has a cylindrical portion 2a (through which the first shaft portion 5b of the connection pin 5 is inserted) and a circular flange portion 2b formed below the cylindrical portion 2a. For example, an insulating resin such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), and perfluoroalkoxy fluorine (PFA) can be used.

  The peripheral portion in which the through hole 1a on the back side (battery inner side) of the battery lid 1 is formed is slightly thinner (according to the size of the flange portion 2b of the gasket 2) (see FIG. 2). One surface side of the flange portion 2 b of the gasket 2 (the upper side of the flange portion 2 b shown in FIGS. 2 and 4) is in contact with the thinned back surface of the battery lid 1. On the other hand, on the upper surface side of the flange portion 5a of the connection pin 5, an annular first convex portion 5f having a diameter smaller than the outermost peripheral diameter of the flange portion 2b of the gasket 2 (see FIG. 4), and further on the inside thereof, An annular second convex portion 5g having a diameter larger than the outer diameter of the cylindrical portion 2a of the gasket 2 is projected, and the other surface side of the flange portion 2b of the gasket 2 (the flange portion shown in FIGS. 2 and 4). The lower side of 2b is pressed. In other words, on the flange portion 5a side of the connection pin 5 that is pressed against the other surface side of the flange portion 2b of the gasket 2, an annular first convex portion 5f smaller than the flange portion 2b of the gasket 2 and an annular shape on the inside thereof. It has the 2nd convex part 5g. 2 and 4 schematically show the compression deformation of the gasket 2, the lower side (other side) of the flange portion 2b of the gasket 2 is the first convex portion 5f and the second convex portion. It is a plane on which no groove or the like corresponding to the portion 5g is formed.

  A cylindrical protrusion (non-penetrating) for fixing the insulating member 3 in order from the right side of FIG. 3 is fixed to the end side of the battery lid 1 from the position where the through hole 1a is formed, in order from the right side of FIG. Sometimes, two circular protrusions (non-penetrating) for locking the rotation of the insulating member 3 project in a direction intersecting the longitudinal direction of the battery lid 1. In the present embodiment, a virtual straight line connecting the center of the through-hole 1a and the center of the cylindrical protrusion and a virtual straight line connecting the centers of the two circular protrusions are formed at positions orthogonal to each other. Yes. In the above description, it has been described that the battery cover 1 has three through holes. However, the battery cover 1 has three through holes and six non-through protrusions.

  Insulating member 3 is made of glass fiber (FG) mixed with “hard plastic” defined in terms of JIS K6900 plastic terminology in order to ensure strength because it is arranged outside the battery. The insulating member 3 has a generally rectangular shape (an arc on one side) as a whole, and a plurality of spaces for fixing or housing the above-described members are formed therein by resin molding (see FIG. 3). ). That is, a square-shaped head receiving space (right side of the insulating member 3 shown in FIG. 3) for receiving the head of the square head bolt 12 without rattling (with as little arrow as possible) is formed immediately below the head receiving space. The projection housing space for accommodating the cylindrical projection and the head housing space (adjacent to the insulating member 3 shown in FIG. 3) are formed adjacent to the tip of the tubular portion 2a of the gasket 2 and the first of the connection pin 5. A circular accommodation space that accommodates the distal end side of the shaft portion 5b, an external terminal accommodation space that accommodates the external terminal 4 that is formed over the head accommodation space and directly above the circular accommodation space is formed (see FIG. 2). . In addition, a recess is formed on the bottom side of the insulating member 3 so as to be fitted into a circular protrusion protruding from the battery lid 1.

  The square head bolt 12 of the present embodiment is made of steel plated with nickel, the head is composed of a relatively thin square plate-like member, and the male thread is on the shaft. It is screwed.

  The external terminal 4 is formed by connecting two portions of a rectangular portion having a substantially square shape with a round hole formed at the center and a circular portion having a substantially circular shape with a round hole formed at the center (see FIG. 3). ), A constricted portion having a width reduced from the width of the rectangular portion and the circular portion is formed at a position where the rectangular portion and the circular portion are connected. Through this constricted portion, a step corresponding to the thickness of the head of the square-head bolt 12 is formed in the height direction (vertical direction shown in FIG. 3) between the rectangular portion and the circular portion (see also FIG. 1). ). This step can eliminate the problem of poor contact when the rectangular portion of the external terminal 4 is exposed to the upper side from the insulating member 4 and the cells are connected by the bus bar described above.

  As shown in FIG. 3, the insulating member 3 has a cylindrical protrusion projecting from the battery lid 1 in a protrusion housing space, with a circular protrusion projecting from the battery lid 1 engaged with a recess formed on the bottom side. The protrusion is inserted. The insulating projection 3 is fixed to the battery lid 1 by bending the tip of the cylindrical projection outward by approximately 90 ° by caulking (processing). Moreover, the head of the square head bolt 12 is accommodated in the head accommodating space. The insulating member 3 is formed with a space for preventing contact between the head of the square head bolt 12 and the cylindrical protrusion that is caulked, and an insulating material is interposed in this space as necessary. You may do it.

  As shown in FIG. 2, the other end portion side of the conductive member 9 is caulked with a cylindrical portion formed below the flange portion 5 a of the connection pin 5 (see the caulking portion 5 e in FIG. 2) and fixed to the connection pin 5. The first shaft portion 5b of the connection pin 5 and the cylindrical portion 2a of the gasket 2 are inserted into the through hole 1a of the battery lid 1. For this reason, the flange portion 5a of the connection pin 5 and the flange portion 2b of the gasket 2 are arranged in the battery can 20 (below the battery lid 1).

  In the circular accommodation space of the insulating member 3, the distal end portion of the cylindrical portion 2 a of the gasket 2 and the distal end side of the first shaft portion 5 b of the connection pin 5 are inserted and accommodated. More precisely, the gap defined by the distal end side of the first shaft portion 5 b of the connection pin 5 and the circular accommodation space of the insulating member 3 is sealed by the distal end portion of the cylindrical portion 2 a of the gasket 2. The second shaft portion 5c of the connection pin 5 is inserted through the circular hole of the circular portion of the external terminal 4 (see FIG. 2). On the other hand, the shaft portion of the square head bolt 12 is inserted into the round hole of the rectangular portion of the external terminal 4 (see FIG. 3), and the external terminal 4 is the head (upper surface) of the square head bolt 12 and the head of the shaft portion. It is in contact with the part side.

  As shown in FIG. 2, the cylindrical portion of the connection pin 5 is bent approximately 90 ° outward by caulking (processing) (see the caulking portion 5d in FIG. 2). Therefore, the connecting pin 5, the gasket 2, the insulating member 3, the square head bolt 12, and the external terminal 4 are fixed to the battery lid 1 by the caulking portion 5 d of the connecting pin 5 in a state in which an electrical short circuit with the battery lid 1 is prevented. Has been. Further, the other end portion side of the conductive member 9 is caulked to the caulking portion 5e of the connection pin 5, and the one end portion side of the conductive member 9 is welded to the negative electrode joint portion 7a as described above. 11 is also supported on the battery lid 1 by the caulking portion 5 d of the connection pin 5 through the conductive member 9.

  The positive electrode terminal portion 16 has the same structure as the negative electrode terminal portion 15 described above in principle, but differs in the following points. First, the positive terminal portion 16 is arranged symmetrically with respect to the negative terminal portion 15. Further, the connection pins 5 and the external terminals 4 are made of aluminum alloy. Further, the conductive member 9 made of aluminum alloy is used in relation to the metal material constituting the positive electrode terminal portion 16.

(Battery assembly procedure)
Next, a procedure for assembling the secondary battery of this embodiment will be briefly described. It should be noted that the present invention is not limited to the assembly method exemplified below.

  First, a positive and negative bipolar uncoated portion of the power generation element group 11 is applied to a battery lid assembly 10 (as shown in FIG. 3, the conductive member 9 is crimped to the connection pin 5 in this state). 11a and 11b and the bipolar current collector plates 7 and 8 are joined by ultrasonic welding at the joining portions 7a and 8a, and the one end portion side of the conductive member 9 is also joined at the same time. Next, these are inserted into the battery can 20 through the insulating case 21, and the battery can 20 is sealed by laser (beam) welding the battery can 20 and the battery lid 1. Thereafter, an electrolytic solution is injected from the liquid injection port 22, and the liquid injection stopper 23 is hermetically sealed by laser welding.

  The battery lid assembly 10 can be manufactured as follows. First, a circular protrusion protruding from the battery lid 1 is fitted into a recess formed on the bottom side of the insulating member 3, and a cylindrical protrusion protruding from the battery cover 1 is inserted into the protrusion receiving space, thereby The tip of the protrusion is bent approximately 90 ° outward by caulking, and the insulating member 3 is temporarily fixed to the battery lid 1. Next, the gasket 2 is inserted into the first shaft portion 5 b of the connection pin 5 from above, and is inserted into the through hole 1 a of the battery lid 1 from the lower side. Further, the insulating member 3 is connected from the upper side of the battery lid 1. The gasket 2 inserted through the pin 5 is inserted. Next, the square-head bolt 12 is sandwiched between the insulating member 3 and the external terminal 4 so that the external terminal 4 is inserted through the second shaft portion 5c of the connection pin 5, and finally, the cylindrical portion of the connection pin 5 is inserted. The battery lid assembly 10 is completed by crimping. In addition, since the attachment method of the cleavage valve 25 is well-known, the description is abbreviate | omitted.

(Effects etc.)
Next, functions and effects of the secondary battery of this embodiment will be described.

  In the secondary battery of the present embodiment, a first convex portion 5f having a diameter smaller than the outermost peripheral diameter of the gasket 2 and a second convex portion 5g on the inner side thereof protrude from the flange portion 5a of the connection pin 5. The lower side (other side) of the flange portion 2b of the gasket 2 is pressed. For this reason, according to the secondary battery of this embodiment, the seal portion 2c (see FIG. 4) of the gasket 2 surrounded between the first convex portion 5f and the second convex portion 5g does not flow. 2 is increased and the rate of pressure decrease is reduced, so that liquid leakage does not occur for a long period of time and a secondary battery excellent in vibration resistance and durability can be obtained.

  In other words, the secondary battery of the present embodiment is caulked by the caulking portion 5d, so that the gasket 2 is provided with the first and second convex portions 5f and 2f protruding from the flange portion 5a of the connection pin 5. Compressed by 5g. The amount of compression at this time can be arbitrarily set by changing the length 5h (see FIG. 4) of the first shaft portion of the connection pin 5. Further, the position of the external terminal 4 inserted through the second shaft portion 5c is not affected by the fluctuation of the caulking load due to the step between the first shaft portion 5b and the second shaft portion 5c of the connection pin 5. It is fixed at a fixed position, and a stable surface pressure can be obtained.

  In contrast to the secondary battery of the present embodiment, the conventional secondary battery sealing structure has a single ring (one ring) formed on the ring-shaped convex portion projecting from the flange portion of the connection pin. Since the gasket 2 compressed by the flange of the connecting pin and the convex portion of the connecting pin easily flowed to both sides of the protruding portion, the pressing of the contact surface between the battery lid 1 and the flange portion of the connecting pin as shown in FIG. Since the pressure decreased and the speed of pressure reduction increased, liquid leakage was likely to occur in a short period of time.

  This mechanism will be described in detail with reference to FIGS. FIG. 5 shows a conventional connection pin in which a single ring convex portion protrudes from the flange portion, and a book in which two ring convex portions (first convex portion 5f and second convex portion 5g) project from the flange portion 5a. It is a characteristic diagram showing the relation between the amount of compression and the surface pressure when the gasket 2 is compressed with the connection pin 5 of the embodiment. Taking the compression amount (mm) of the gasket 2 on the horizontal axis and the surface pressure (MPa) of the gasket 2 on the vertical axis, the surface pressure relative to the compression amount when the gasket 2 is compressed by the one ring convex portion and the two ring convex portions, respectively. The actual measurement results are shown. As shown in FIG. 5, it can be seen that the surface pressure of the two-ring convex portion is higher than that of the one-ring convex portion even with the same compression amount. This is because the flow of the gasket 2 due to the compression is less in the two-ring convex portion than in the one-ring convex portion, and thus the airtightness inside the battery can be more reliably maintained.

  FIG. 6 is a characteristic diagram showing the relationship between the time and the surface pressure retention rate when the gasket 2 is compressed with the connection pins 5 having the one-ring convex portion and the two-ring convex portion protruding. That is, the elapsed time is expressed in logarithm on the horizontal axis, and the ratio (surface pressure retention ratio) to the initial surface pressure of the gasket 2 is taken on the vertical axis, and the gasket 2 is compressed by the one ring convex portion and the two ring convex portions, respectively. It is a characteristic diagram which presumed the surface pressure retention over a long period of time based on the measurement result of the surface pressure retention over time. As shown in FIG. 6, for example, when comparing the elapsed time to reach the surface pressure retention ratio of 60%, the one ring convex part is about 9000 hours (about one year), and the two ring convex part is about 90000 hours (about 10 years). It turns out that it is. This means that the creep rate (surface pressure reduction rate) is about 10 times slower for the two-ring convex portion than for the one-ring convex portion, and the durability of the two-ring convex portion (battery) This shows that the internal airtightness is significantly improved.

  Further, in the secondary battery of this embodiment, the peripheral portion on the back side of the battery lid 1 in which the through hole 1a is formed is thinned, and the one surface side of the flange portion 2b of the gasket 2 is thinned. It touches the back. When the peripheral portion on the back side of the battery lid 1 is thinned, the step formed on the back side of the battery lid 1 (see FIG. 2 and FIG. 4) causes the electrolyte solution when vibration is applied to the secondary battery. Can be prevented from moving upward over the contact surface between the battery lid 1 and the flange portion 2 b of the gasket 2. For this reason, the reliability of a seal part can be improved.

  Furthermore, in the secondary battery of the present embodiment, the battery can 20 and the battery lid 1 are made of an aluminum alloy metal, and the connection pin 5 has a caulking portion disposed on the tip end side and outside the battery lid 1. The connecting pin 5 is caulked (by the caulking portion 5d) via the insulating member 3 abutting on the battery lid 1 and the external terminal 4 supported (so as to be accommodated) by the insulating member 3. For this reason, while being able to fix a terminal part to the battery cover 1 simply (an assembly property improves), a sealing state can be improved.

  And in the secondary battery of this embodiment, the connection pin 5 has penetrated the insulating member 3 and the external terminal 4, and the diameter of the 2nd axial part 5c of the connection pin 5 of the part which penetrates the external terminal 4 is 1st. Since it is smaller than the diameter of one shaft portion 5b, the insulating member 3 and the external terminal 4 can be securely fixed in a compact space by caulking the cylindrical portion (by the caulking portion 5d).

  In the present embodiment, a rectangular lithium ion secondary battery is illustrated, but the present invention is not limited to this, and can be applied to, for example, a cylindrical secondary battery. Further, in the present embodiment, the power generation element group having a flat wound structure is exemplified, but the present invention is not limited to this, for example, a power generation element group having a cylindrical wound structure that is not flattened, or a positive and negative electrode with a separator. The present invention can also be applied to a power generation element group having a laminated structure in which layers are interposed. Moreover, in this embodiment, although the bottomed battery can 20 and the one battery lid 1 which seals this opening part were illustrated, this invention is the secondary which has a bottomless battery can and two battery lids, for example There is no doubt that it can be applied to batteries. Further, in the present embodiment, the battery can 20 and the battery lid 1 are exemplified by aluminum alloys, but the present invention is not limited thereto, and examples thereof include aluminum, nickel, steel, and stainless steel. These may be made of metal or may be made of resin, and the material is not particularly limited.

  In the present embodiment, an example in which a two-ring convex portion is provided on the flange portion 5a side of the connection pin 5 that contacts the other surface side (lower side) of the flange portion 2b of the gasket 2 is shown. However, the present invention is not limited to this, and for example, a convex portion exceeding two rings (for example, a three-ring convex portion) is projected (the present inventors consider that this aspect also belongs to the technical scope of the present invention). The two-ring convex portion (first side) is not provided on the flange portion 5a side of the connection pin 5 but on the back side of the battery cover 81 that is in contact with one surface side (upper surface side) of the flange portion of the gasket 2. You may make it project the convex part 81a and the 2nd convex part 81b) (refer FIG. 7). Moreover, you may make it project a 1 ring convex part or a 2 ring convex part in the flange part 5a side of the connection pin 5 in which the 2 ring convex part is not protrudingly provided, or the back side of a battery cover. In such an aspect, the positions of all the convex portions may be arranged at different positions in the horizontal direction.

  Furthermore, in this embodiment, for example, as shown in FIG. 4, the first convex portion 5f and the second convex portion 5g have the same annular shape (the present inventors have an oval shape or an elliptical shape). However, the present invention is not limited to this, and for example, a rectangular shape or a combination of a rectangular shape and an annular shape is used. In addition, it is also possible to use a projection having different heights, widths, and shapes (including not only the overall shape but also the cross-sectional shape) between the two ring convex portions. .

  Moreover, in this embodiment, although the 2 ring convex part without a missing part (part) was illustrated, this invention is not restricted to this, At least one cyclic | annular thru | or rectangular part of a 1st convex part May be missing. For example, a first convex portion 92 lacking one annular portion is protruded from the flange portion 91 of the connection pin (see FIG. 8A) or a second convex portion 93 lacking one annular portion. Projecting (see FIG. 8B), or projecting the first convex portion 92 and the second convex portion 93, which are missing at different locations in one annular position (see FIG. 9A). ), The first convex portion 95 and the second convex portion 96 that are missing at two different locations may be provided in a protruding manner (see FIG. 9B). By forming such a missing part, deformation of the gasket 2 is reduced, so that the reliability (stability) of sealing by the gasket 2 can be improved, and even if the missing part is formed, FIG. The relative relationship of the characteristic diagram shown in FIG. 6 does not change, and the sealing performance can be satisfied without impairing the surface pressure and durability. 8 and 9, reference numeral 94 represents a cross section of the first shaft portion.

  Further, in the present embodiment, the flange portion 5a of the connection pin 5 and the flange portion 2b of the gasket 2 are exemplified as circular ones, but the present invention is not limited to this, and for example, a rectangular one may be used. Good. In addition, although the first shaft portion 5b, the second shaft portion 5c, and the like of the connection pin 5 are illustrated as shaft portions having a circular cross section, the present invention is not limited thereto, and may be a shaft portion having a rectangular cross section, for example.

  Furthermore, in this embodiment, although the example which accommodated the square-shaped head of the square head bolt 12 in the head accommodation space was shown, this invention is not restricted to this, A head rotates to a head accommodation space. Therefore, the shape of the head may be a polygonal shape. Further, a nut may be accommodated in the accommodation space instead of the head of the square head bolt 12. In such an embodiment, the bus bar is fixed to the nut with a bolt.

(Second Embodiment)
Next, a second embodiment in which the present invention is applied to a rectangular lithium-ion secondary battery for a hybrid vehicle will be described. In the present embodiment, the second convex portion 5 g is formed so as to be connected to the first shaft portion 5 b of the connection pin 5. Note that, in the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted, and only different portions will be described below.

  As shown in FIGS. 10 and 11, in the second embodiment, the first convex portion 5f and the second convex portion 5g are changed from the flange portion 5a of the connection pin 5 to the flange portion of the gasket 2 as in the first embodiment. 2b protrudes toward the other surface side, but differs in that the second convex portion 5g is formed so as to be connected (connected) to the first shaft portion 5b of the connection pin 5. Yes. In other words, the connection pin 5 is not formed with a step between the second convex portion 5g and the first shaft portion 5b as shown in the first embodiment (FIGS. 2 and 4). See also). 10 and 11 schematically show the compression deformation of the gasket 2 as in FIGS. 2 and 4, but the lower side (the other surface side) of the flange portion 2b of the gasket 2 is the first. It is a plane in which grooves corresponding to the first convex portion 5f and the second convex portion 5g are not formed.

  In the secondary battery according to the second embodiment, the same effect as that of the secondary battery according to the first embodiment described above is obtained, and the flange portion 5a of the connection pin 5 is directed to the other surface side of the flange portion 2b of the gasket 2. The second protruding portion 5g protruding in this manner is formed so as to be connected to the first shaft portion 5b of the connection pin 5 (between the second protruding portion 5g and the first shaft portion 5b). Therefore, the flange portion 5a of the connection pin 5 can be made small. As a result, the connection pin 5 and the gasket 2 can be reduced in size and cost.

  In the second embodiment, an example is shown in which the second convex portion 5g is formed so as to be connected to the first shaft portion 5b of the connection pin 5, but the present invention is not limited to this. Instead, for example, as shown in FIG. 12, the first convex portion 81a and the second convex portion 81b are projected from the back side of the battery lid 81 toward the one surface side of the flange portion of the gasket 2, The first convex portion 81a is formed integrally with the back surface of the battery lid 81 (constitutes the same plane), and one side of the flange portion of the gasket 2 on the back surface side of the integrally formed battery lid 81. You may make it comprise the edge part which press-contacts as the 1st convex part 81a. In other words, in this aspect, the first convex portion 81a is formed continuously as the back surface of the battery lid 81, and the step formed between the first convex portion 81a and the second convex portion 81b. Thus, the back surface of the battery lid 81 is intermittent, and the end of the back surface of the battery lid 81 on the outer peripheral side from this step constitutes a first convex portion 81a. Also in this aspect, the same effects as those of the second embodiment described above are achieved. In this aspect, in order to enhance durability (maintaining airtightness inside the battery), it is desirable that the outer periphery of the flange portion 5b of the connection pin 5 is larger in diameter than the outer periphery of the first convex portion 81a.

  Further, in the second embodiment, the two-ring convex portion having no missing portion (part) is exemplified, but as described in the first embodiment, at least one annular or rectangular portion of the first and second convex portions. May be missing.

  Since the present invention provides a secondary battery that does not leak for a long period of time and has excellent vibration resistance and durability, it contributes to the manufacture and sale of secondary batteries. Have.

1 Battery cover 1a Through hole 2 Gasket (seal member)
3 Insulating member 4 External terminal 5 Connection pin (external conductive member)
5a, 91 Flange portion 5b, 94 First shaft portion (shaft portion)
5c Second shaft portion 5d Caulking portion (caulking portion disposed outside the battery cover)
5e Caulking portion 5f, 81a, 92, 95 First convex portion 5g, 81b, 93, 96 Second convex portion 7 Negative electrode current collector plate 8 Positive electrode current collector plate 11 Power generation element group 20 Battery can

Claims (8)

  1. A power generation element group in which a positive electrode plate and a negative electrode plate are arranged via a separator;
    An electrolyte solution infiltrating the power generation element group;
    A battery can containing the power generation element group and the electrolyte;
    A battery lid for sealing the opening of the battery can;
    An external conductive member electrically connected to each of the positive and negative electrode plates of the power generation element group and inserted through a through-hole formed in the battery lid;
    A seal member sandwiched between the battery lid and the external lead terminal in the through hole;
    With
    The external conductive member has a shaft portion inserted through the through hole, and a flange portion formed on one side of the shaft portion and disposed in the battery can.
    The seal member includes a cylindrical portion into which the shaft portion of the external conductive member is inserted, and a flange portion formed on one side of the cylindrical portion, and one surface side of the flange portion is a back surface of the battery lid. The other side is in contact with the flange portion of the external conductive member,
    Than the outermost periphery of the seal member on the flange portion side of the external conductive member that is in pressure contact with the other surface side of the flange portion of the seal member or on the back surface side of the battery lid that is in pressure contact with one surface side of the flange portion of the seal member Having a small annular or rectangular first convex part and further an annular or rectangular second convex part on the inside thereof,
    A secondary battery characterized by that.
  2.   2. The secondary battery according to claim 1, wherein at least a part of one of the first and second convex portions of the annular or rectangular portion is missing.
  3.   A peripheral portion on the back side of the battery lid in which the through hole is formed is thinned, and one surface side of the flange portion of the seal member is in contact with the thinned back surface of the battery lid. The secondary battery according to claim 1 or 2.
  4.   The first and second convex portions project from the flange portion side of the external conductive member toward the other surface side of the flange portion of the seal member, and the second convex portion is formed on the external conductive member. The secondary battery according to claim 1, wherein the secondary battery is formed so as to be connected to the shaft portion.
  5.   The first and second convex portions protrude from the back surface side of the battery lid toward one surface side of the flange portion of the seal member, and the first convex portion is integrated with the back surface of the battery lid. The end portion that is formed and press-contacts one surface side of the flange portion of the sealing member on the back surface side of the battery lid that is integrally formed constitutes the first convex portion. Secondary battery described in 1.
  6.   The secondary battery according to claim 5, wherein an outer periphery of the flange portion of the external conductive member has a diameter larger than an outer periphery of the first convex portion.
  7.   The battery can and the battery lid are made of metal, and the external conductive member further includes a caulking portion disposed on the other side of the shaft portion and outside the battery lid. 7. The battery cover according to claim 1, wherein the caulking portion is fixed to the battery cover by being caulked through an insulating member that contacts the battery cover and an external terminal supported by the insulating member. The secondary battery according to item 1.
  8.   The external conductive member passes through the insulating member and an external terminal, and a diameter of the external conductive member at a portion passing through the external terminal is smaller than a diameter of a shaft portion of the external conductive member. The secondary battery according to 7.
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CN103515568A (en) * 2012-06-28 2014-01-15 丰田自动车株式会社 Sealed battery and method of manufacturing the same
JP2014049396A (en) * 2012-09-03 2014-03-17 Toyota Motor Corp Process of manufacturing sealed battery
JP2014072190A (en) * 2013-09-12 2014-04-21 Hitachi Vehicle Energy Ltd Square secondary battery
CN103904286A (en) * 2012-12-25 2014-07-02 丰田自动车株式会社 Sealed battery
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JP2014072190A (en) * 2013-09-12 2014-04-21 Hitachi Vehicle Energy Ltd Square secondary battery
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KR101573488B1 (en) * 2013-12-04 2015-12-02 (주)영하이테크 Assembly of electrode
JP2015115311A (en) * 2013-12-16 2015-06-22 株式会社豊田自動織機 Electricity storage device
KR20150091007A (en) 2014-01-30 2015-08-07 도요타 지도샤(주) Secondary battery and manufacturing method of secondary battery
US9761860B2 (en) 2014-01-30 2017-09-12 Toyota Jidosha Kabushiki Kaisha Secondary battery and method for producing secondary battery
CN104821387A (en) * 2014-01-30 2015-08-05 丰田自动车株式会社 Secondary battery and method for producing secondary battery
US20150214537A1 (en) * 2014-01-30 2015-07-30 Toyota Jidosha Kabushiki Kaisha Secondary battery and method for producing secondary battery
JP2016100323A (en) * 2014-11-26 2016-05-30 トヨタ自動車株式会社 Battery and manufacturing method for the same
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