JP5867376B2 - Sealed battery - Google Patents

Description

  The present invention relates to a sealed battery including a current interruption mechanism that interrupts a current flowing through an electrode body when an internal pressure of a battery case reaches an operating pressure.

  In recent years, a chargeable / dischargeable sealed battery has been used as a driving power source for vehicles such as hybrid vehicles and electric vehicles, and portable electronic devices such as notebook computers and video camcorders. As this sealed battery, there is known a sealed battery having a current cutoff mechanism that cuts off the current flowing through the electrode body when the internal pressure of the battery case rises due to overcharging or the like and the internal pressure of the battery case reaches the operating pressure. (For example, refer to Patent Document 1).

JP 2012-38529 A

  The current interruption mechanism of Patent Document 1 includes a current collector terminal member connected to an electrode body, and a diaphragm electrically connected to the current collector terminal member and deformed in a direction away from the current collector terminal member due to an increase in internal pressure of the battery case. (Deformation member) and a connecting member (caulking part) that is fixed to the diaphragm and electrically connects the external terminal and the diaphragm. When the internal pressure of the battery case reaches the operating pressure, the diaphragm is separated from the current collecting terminal member due to its own deformation, and cuts off the current supply with the electrode body through the current collecting terminal member. Further, the connecting member has a facing surface facing the inner surface of the sealing lid (sealing plate) in the battery case.

  Furthermore, the current interruption mechanism of Patent Document 1 is sandwiched between the inner surface of the sealing lid and the facing surface of the connecting member, and a sealing member that seals between the inner surface of the sealing lid and the facing surface of the connecting member; And an insulating member (an inner upper gasket and an inner lower gasket) fixed to the current collecting terminal member. The insulating member has an insulating peripheral portion that is located around the sealing member between the inner surface of the sealing lid and the opposing surface of the connecting member, and in which the sealing member is disposed in a through hole that penetrates the sealing member in the thickness direction. . The connecting member is fixed to the sealing lid in such a form that the sealing lid is pressed through the sealing member. For this reason, the diaphragm fixed to the connecting member is also fixed to the sealing lid.

  By the way, in the current interruption mechanism as described above, the following event may occur. Specifically, in order to reliably seal between the inner surface of the sealing lid and the facing surface of the connecting member by the sealing member, for example, the thickness of the insulating peripheral portion is made thinner than the thickness of the sealing member. In some cases, the sealing member is securely sandwiched between the inner surface of the sealing lid and the opposing surface of the connecting member. In such a configuration, there is a possibility that the insulating peripheral portion cannot be fixed by being sandwiched between the inner surface of the sealing lid and the opposing surface of the connecting member. For this reason, there is a possibility that the current collecting terminal member fixed to the insulating member cannot be fixed. Therefore, although the diaphragm is fixed to the sealing lid of the battery case, there is a possibility that the current collecting terminal member connected to the diaphragm is not fixed.

  In such a configuration, the position (posture) of the current collecting terminal member with respect to the diaphragm is not fixed (the current collecting terminal member may move in the battery case), and as a result, the junction between the diaphragm and the current collecting terminal member As a result, the operating pressure of the current interrupting mechanism (the internal pressure of the battery that is deformed from the diaphragm and is separated from the current collecting terminal member) may vary. Further, when the connection position between the diaphragm and the current collecting terminal member is not joined, the connection position between the diaphragm and the current collecting terminal member cannot be fixed, and as a result, the operating pressure of the current interrupting mechanism varies. There was a risk of it occurring.

  This invention is made in view of this subject, Comprising: While between the inner surface of a sealing lid and the opposing surface of a connection member is reliably sealed by the sealing member, an insulation member (insulation surrounding part) An object of the present invention is to provide a sealed battery that is securely fixed between a sealing lid and a connecting member.

  One aspect of the present invention is an airtight type including an external terminal, an electrode body, a battery case, and a current interrupt mechanism that interrupts a current flowing through the electrode body when an internal pressure of the battery case reaches an operating pressure. In the battery, the battery case includes a case main body that houses the electrode body, and a sealing lid that seals an opening of the case main body, and the current interrupting mechanism is a current collecting terminal connected to the electrode body A member, a diaphragm connected to the current collecting terminal member, and deformed in a direction away from the current collecting terminal member due to an increase in internal pressure of the battery case; and fixed to the diaphragm to electrically connect the external terminal and the diaphragm A connecting member having a facing surface facing the inner surface of the sealing lid, and being compressed between the inner surface of the sealing lid and the facing surface of the connecting member A sealing member that seals between the inner surface of the sealing lid and the facing surface of the connecting member, and a periphery of the sealing member between the inner surface of the sealing lid and the facing surface of the connecting member An insulating member having an insulating peripheral portion in which the sealing member is disposed in a through-hole penetrating itself in the thickness direction, and an insulating member fixed to the current collecting terminal member, The thickness of the insulating peripheral portion is made thinner than the thickness of the sealing member, and the connection member is fixed to the sealing lid in a form of pressing the sealing lid through the sealing member, The outer peripheral surface of the sealing member has a sealing taper surface that increases in diameter from the inner surface side of the sealing lid toward the opposing surface side of the connection member, and constitutes the through hole in the insulating peripheral portion. The inner peripheral surface is connected to the connecting portion from the inner surface side of the sealing lid. And having an insulating taper surface in which the diameter of the through hole expands toward the facing surface side, and at least a part of the sealing member is pressed against the facing surface side of the connecting member and compressed by the sealing lid. By expanding the sealing member radially outward, the sealing taper surface is moved radially outward, and the insulating taper surface is pushed toward the sealing lid by the sealing taper surface. A sealed battery in which a peripheral portion is pressed against the inner surface of the sealing lid and the insulating member is fixed to the sealing lid.

In the above-described sealed battery, the connection member is fixed to the sealing lid in a form that presses the sealing lid via the sealing member. For this reason, the diaphragm fixed to the connecting member is also fixed to the sealing lid.
Furthermore, in the above-described sealed battery, the sealing member is sandwiched and compressed between the inner surface of the sealing lid and the facing surface of the connecting member, and the space between the inner surface of the sealing lid and the facing surface of the connecting member is sealed. doing. Moreover, the thickness of the insulating peripheral portion is made thinner than the thickness of the sealing member. Thereby, a sealing member can be stuck to the inner surface of a sealing lid, and the opposing surface of a connection member, and between the inner surface of a sealing lid and the opposing surface of a connection member can be sealed reliably.

  Furthermore, in the above-described sealed battery, the outer peripheral surface of the sealing member has a sealing taper surface whose diameter increases from the inner surface side of the sealing lid toward the opposing surface side of the connection member. Further, the through hole as the inner peripheral surface constituting the through hole of the insulating peripheral part (the part of the insulating member positioned around the sealing member) moves from the inner surface side of the sealing lid toward the opposing surface side of the connecting member. Has an insulating taper surface that expands in diameter. Furthermore, in the above-described sealed battery, the sealing member is expanded radially outward by pressing at least a part of the sealing member toward the facing surface of the connecting member and compressed by the sealing lid, and the sealing taper. The surface is moved radially outward. Thereby, the insulating taper surface is pushed by the sealing taper surface toward the sealing lid, and the insulating peripheral portion is pressed against the inner surface of the sealing lid. By setting it as such a form, an insulating member (insulation surrounding part) can be reliably fixed between a sealing lid and a connection member.

  Therefore, the above-described sealed battery is surely sealed between the inner surface of the sealing lid and the facing surface of the connecting member by the sealing member, and the insulating member (insulating peripheral portion) is connected to the sealing lid and the connecting member. The sealed battery is securely fixed between the two.

  In such a sealed battery, since the position (posture) of the current collecting terminal member with respect to the diaphragm is fixed (since there is no possibility of the current collecting terminal member moving in the battery case), the diaphragm and the current collecting terminal member are joined. There is no possibility that the operating pressure of the current interrupting mechanism (the internal pressure of the battery that is separated from the current collecting terminal member due to the deformation of the diaphragm) varies due to the stress applied to the portion. In addition, even when the connection position between the diaphragm and the current collecting terminal member is not joined, the connection position between the diaphragm and the current collecting terminal member can be fixed, which may cause variations in the operating pressure of the current interrupt mechanism. Absent.

  Further, in the sealed battery described above, a part of the outer peripheral end portion including the outer peripheral surface of the sealing member is interposed between the insulating peripheral portion and the facing surface of the connection member. The sealed peripheral battery may be formed by pressing the insulating peripheral portion against the inner surface of the sealing lid.

  In the above-described sealed battery, since the insulating peripheral portion can be pressed more firmly against the sealing lid, the insulating member (insulating peripheral portion) can be more reliably fixed between the sealing lid and the connecting member.

  Furthermore, in any one of the above sealed batteries, the sealing lid has a protruding portion that protrudes from the inner surface of the sealing member toward the facing surface of the connecting member, and the protruding portion of the sealing lid By pressing and compressing a part of the sealing member toward the facing surface of the connecting member, the sealing member is expanded radially outward and the sealing taper surface is moved radially outward. A sealed battery in which the insulating taper surface is pressed against the sealing lid by pressing the insulating taper surface toward the sealing lid, and the insulating member is pressed against the inner surface of the sealing lid; Good.

  A projection is provided on the sealing lid, and by this projection, a part of the sealing member is pressed against the facing surface side of the connecting member and compressed, thereby forming a gap between the sealing lid and the facing surface of the connecting member. It can seal more reliably. Furthermore, since a part of the sealing member can be greatly compressed to the facing surface side of the connection member, the sealing taper surface of the sealing member moves (trys to move) radially outward, and as a result The insulating tapered surface can be strongly pressed toward the sealing lid by the sealing tapered surface. Thereby, an insulation surrounding part can be strongly pressed on the inner surface of a sealing lid, and an insulating member can be firmly fixed with respect to a sealing lid.

  Another aspect of the present invention is a hermetic seal including an external terminal, an electrode body, a battery case, and a current interrupt mechanism that interrupts a current flowing through the electrode body when the internal pressure of the battery case reaches an operating pressure. In the battery, the battery case has a case main body that houses the electrode body, and a sealing lid that seals the opening of the case main body, and the current interrupting mechanism is a current collector connected to the electrode body. A terminal member, a diaphragm connected to the current collecting terminal member and deformed in a direction away from the current collecting terminal member due to an increase in internal pressure of the battery case, and fixed to the diaphragm to electrically connect the external terminal and the diaphragm. A connecting member that is electrically connected, having a facing surface facing the inner surface of the sealing lid, sandwiched between the inner surface of the sealing lid and the facing surface of the connecting member, A sealing member that seals between the inner surface of the palate and the facing surface of the connecting member, and is positioned around the sealing member between the inner surface of the sealing lid and the facing surface of the connecting member And an insulating member having an insulating peripheral portion in which the sealing member is disposed in a through-hole penetrating itself in the thickness direction, the insulating member fixed to the current collecting terminal member, and the insulating member The thickness of the peripheral portion is made thinner than the thickness of the sealing member, and the connecting member is fixed to the sealing lid in a form of pressing the sealing lid through the sealing member, and the sealing member The outer peripheral surface of the stopper member has a sealing taper surface that decreases in diameter from the inner surface side of the sealing lid toward the opposite surface side of the connection member, and constitutes the through hole in the insulating peripheral portion. The peripheral surface is above the connecting member from the inner surface side of the sealing lid. The through hole has an insulating taper surface whose diameter decreases toward the facing surface side, and at least a part of the sealing member is pressed against the facing surface side of the connecting member and compressed by the sealing lid. The sealing member is expanded radially outward, the sealing taper surface is moved radially outward, and the insulating taper surface is pushed by the sealing taper surface toward the facing surface of the connecting member. The sealed battery is formed by pressing the insulating peripheral portion against the facing surface of the connecting member and fixing the insulating member to the connecting member.

In the above-described sealed battery, the connection member is fixed to the sealing lid in a form that presses the sealing lid via the sealing member. For this reason, the diaphragm fixed to the connecting member is also fixed to the sealing lid.
Furthermore, in the above-described sealed battery, the sealing member is sandwiched and compressed between the inner surface of the sealing lid and the facing surface of the connecting member, and the space between the inner surface of the sealing lid and the facing surface of the connecting member is sealed. doing. Moreover, the thickness of the insulating peripheral portion is made thinner than the thickness of the sealing member. Thereby, a sealing member can be stuck to the inner surface of a sealing lid, and the opposing surface of a connection member, and between the inner surface of a sealing lid and the opposing surface of a connection member can be sealed reliably.

  Furthermore, in the above-described sealed battery, the outer peripheral surface of the sealing member has a sealing taper surface whose diameter decreases from the inner surface side of the sealing lid toward the opposing surface side of the connection member. Further, the through hole as the inner peripheral surface constituting the through hole of the insulating peripheral part (the part of the insulating member positioned around the sealing member) moves from the inner surface side of the sealing lid toward the opposing surface side of the connecting member. Has an insulating taper surface with a reduced diameter. Furthermore, in the above-described sealed battery, the sealing member is expanded radially outward by pressing at least a part of the sealing member toward the facing surface of the connecting member and compressed by the sealing lid, and the sealing taper. The surface is moved radially outward. Thereby, the insulating taper surface is pushed toward the connecting member by the sealing taper surface, and the insulating peripheral portion is pressed against the facing surface of the connecting member. By setting it as such a form, an insulating member (insulation surrounding part) can be reliably fixed between a sealing lid and a connection member.

  Therefore, the above-described sealed battery is surely sealed between the inner surface of the sealing lid and the facing surface of the connecting member by the sealing member, and the insulating member (insulating peripheral portion) is connected to the sealing lid and the connecting member. The sealed battery is securely fixed between the two.

  Furthermore, in the above sealed battery, a part of the outer peripheral end portion including the outer peripheral surface of the sealing member is interposed between the insulating peripheral portion and the inner surface of the sealing lid, It is preferable to use a sealed battery in which the insulating peripheral portion is pressed against the facing surface of the connecting member.

  In the above-described sealed battery, the insulating peripheral portion can be pressed more firmly against the connecting member, so that the insulating member (insulating peripheral portion) can be more reliably fixed between the sealing lid and the connecting member.

  Furthermore, in any one of the above sealed batteries, the sealing lid has a protruding portion that protrudes from the inner surface of the sealing member toward the facing surface of the connecting member, and the protruding portion of the sealing lid By pressing and compressing a part of the sealing member toward the facing surface of the connecting member, the sealing member is expanded radially outward and the sealing taper surface is moved radially outward. The insulating taper surface is pressed against the facing surface of the connecting member by pressing the insulating tapered surface toward the facing surface of the connecting member, and the insulating member is fixed to the connecting member. It is preferable to use a sealed battery.

  A projection is provided on the sealing lid, and by this projection, a part of the sealing member is pressed against the facing surface side of the connecting member and compressed, thereby forming a gap between the sealing lid and the facing surface of the connecting member. It can seal more reliably. Furthermore, since a part of the sealing member can be greatly compressed to the facing surface side of the connection member, the sealing taper surface of the sealing member moves (trys to move) radially outward, and as a result The insulating taper surface can be strongly pressed to the facing surface side of the connecting member by the sealing taper surface. Thereby, an insulation surrounding part can be firmly pressed on the opposing surface of a connection member, and an insulation member can be firmly fixed with respect to a connection member.

  Furthermore, any one of the above-described sealed batteries may be a sealed battery in which the inclination angles of the sealing taper surface and the insulating taper surface with respect to the inner surface of the sealing lid are both 45 °.

  By making the angle of inclination of the sealing taper surface and the insulating taper surface equal to 45 °, the insulating taper surface is more appropriately pushed to the sealing lid side (or connection member side) by the sealing taper surface to It can be pressed against the inner surface of the sealing lid (or the opposing surface of the connecting member). Accordingly, the insulating member (insulating peripheral portion) can be more reliably fixed between the sealing lid and the connecting member.

1 is a perspective view of a sealed battery according to Examples 1 and 2. FIG. It is a disassembled perspective view of the component of the electric current interruption mechanism of Example 1, and its peripheral member. It is a perspective view of the state which assembled the components group shown in FIG. It is a perspective view of the positive electrode plate of the battery. It is a perspective view of the negative electrode plate of the battery. It is sectional drawing of the electric current interruption mechanism of the battery, and its peripheral member. It is the B section enlarged view of FIG. It is a figure explaining an effect | action of an electric current interruption mechanism. It is the elements on larger scale of the electric current interruption mechanism concerning Example 2. FIG.

Example 1
Next, a first embodiment of the present invention will be described with reference to the drawings. In Example 1, the present invention is applied to the sealed battery 1 shown in FIG.
The sealed battery 1 according to the first embodiment includes an electrode body 3 and a battery case 2 that accommodates the electrode body 3. The electrode body 3 is impregnated with an electrolytic solution (not shown).

  The battery case 2 includes a case body 4 and a sealing lid 5 that seals the opening of the case body 4 (see FIG. 1). The case body 4 is made of metal and has a rectangular box shape. The sealing lid 5 is made of metal and has a rectangular plate shape. The sealing lid 5 closes the opening of the case body 4 and is welded to the case body 4 all around.

  The electrode body 3 is a wound electrode body in which a belt-like positive electrode plate 20 and a negative electrode plate 30 are wound into a flat shape with a belt-like separator (not shown) interposed therebetween (see FIG. 1). ). As shown in FIG. 4, the positive electrode plate 20 includes a strip-shaped positive electrode current collector foil 28 and positive electrode active material layers 21 and 21 formed on both surfaces of the positive electrode current collector foil 28. The positive electrode active material layer 21 is a layer containing a positive electrode active material, and is disposed along one long side extending in the longitudinal direction DA of the positive electrode current collector foil 28.

  A portion of the positive electrode plate 20 on which the positive electrode active material layer 21 is applied is referred to as a positive electrode active material layer application portion 20b (see FIG. 4). On the other hand, a portion made only of the positive electrode current collector foil 28 without having the positive electrode active material layer 21 is referred to as a positive electrode active material layer uncoated portion 20c. The positive electrode active material layer uncoated portion 20 c extends in a strip shape in the longitudinal direction DA of the positive electrode plate 20 along the other long side of the positive electrode plate 20. The positive electrode active material layer uncoated portion 20c is wound to form a spiral shape, and is positioned at one end portion in the axial direction of the electrode body 3 (left end portion in FIG. 1).

  As shown in FIG. 5, the negative electrode plate 30 includes a strip-shaped negative electrode current collector foil 38 and negative electrode active material layers 31 and 31 formed on both main surfaces of the negative electrode current collector foil 38. The negative electrode active material layer 31 is a layer containing a negative electrode active material, and is disposed along one long side extending in the longitudinal direction DA of the negative electrode current collector foil 38.

  A portion of the negative electrode plate 30 where the negative electrode active material layer 31 is coated is referred to as a negative electrode active material layer coating portion 30b (see FIG. 5). On the other hand, a portion made only of the negative electrode current collector foil 38 without having the negative electrode active material layer 31 is referred to as a negative electrode active material layer uncoated portion 30c. The negative electrode active material layer uncoated portion 30 c extends in a strip shape in the longitudinal direction DA of the negative electrode plate 30 along the other long side of the negative electrode plate 30. The negative electrode active material layer uncoated portion 30c is wound to form a spiral shape, and is positioned at the other end portion in the axial direction of the electrode body 3 (right end portion in FIG. 1).

  The positive electrode active material layer uncoated portion 20c of the positive electrode plate 20 in the electrode body 3 is electrically connected by welding the positive electrode terminal structure 60 (see FIG. 6). The positive terminal structure 60 includes the positive external terminal 6 and a current interruption mechanism 80 connected thereto. The negative electrode active material layer uncoated portion 30c of the negative electrode plate 30 is electrically connected by welding the negative electrode terminal structure 70. The negative electrode terminal structure 70 includes a negative electrode external terminal 7 and a negative electrode current collecting terminal member (not shown) connected thereto.

  The current interrupt mechanism 80 is a mechanism that interrupts the current flowing through the electrode body 3 when the internal pressure of the battery case 2 reaches the operating pressure. The current interrupt mechanism 80 will be described in detail later.

  FIG. 2 is an exploded perspective view of the components of the current interrupt mechanism 80 and its peripheral members. The components shown in FIG. 2 are the positive electrode external terminal 6, the bolt 8, the external gasket 9, the sealing lid 5, the first insulating member 11, the sealing member 10, the connection member 13, the diaphragm 14, and the second insulation from the top in the figure. These are the member 15 and the positive electrode current collecting terminal member 16. Among these, the metal conductive parts that become the current path of charge and discharge in the battery 1 are the positive electrode external terminal 6, the bolt 8, the connection member 13, the diaphragm 14, and the positive electrode current collecting terminal member 16.

  The positive external terminal 6 is a plate-shaped member formed into a crank shape, and has a lower step portion 61, an intermediate portion 62, and an upper step portion 63. A through hole 64 is formed in the lower step portion 61, and a through hole 65 is formed in the upper step portion 63. The bolt 8 has a shaft portion 81 and a head portion 82.

  The diaphragm 14 is a rectangular flat plate member, and a circular stepped portion 141 is formed at the center thereof. The stepped portion 141 is convex downward (see FIG. 6). The diaphragm 14 is connected (joined) to the positive electrode current collector terminal member 16 at the stepped portion 141, and is deformed in a direction away from the positive electrode current collector terminal member 16 as the internal pressure of the battery case 2 increases as will be described later.

  The connecting member 13 has a base part 131 and a cylindrical part 132. The cylindrical portion 132 is provided so as to protrude from the center of the upper surface of the base portion 131 (the opposed surface 131b facing the inner surface 5b of the sealing lid 5), and a through hole 133 is formed at the center thereof. The base portion 131 has a rectangular box shape with the lower side open, and a flange portion 134 is provided at the lower end thereof. The connecting member 13 is fixed to the diaphragm 14 (the flange portion 134 is joined to the outer peripheral edge 142 of the diaphragm 14), and electrically connects the positive electrode external terminal 6 and the diaphragm 14. In addition, the connection member 13 (base portion 131) has a facing surface 131 b that faces the inner surface 5 b of the sealing lid 5 in the battery case 2.

  The positive electrode current collecting terminal member 16 includes a current collecting contact portion 162 having a rectangular flat plate shape, and an elongated bent shape current collecting connecting portion 161 extending downward from the current collecting contact portion 162. The current collector connecting portion 161 is a portion that is connected (joined) to the positive electrode active material layer uncoated portion 20 c of the positive electrode plate 20 in the electrode body 3. The current collecting contact portion 162 is a portion that contacts (joins) the stepped portion 141 of the diaphragm 14. The current collecting contact portion 162 has an annular thin portion 165 at the center (see FIG. 6). A through hole 166 is formed at the center of the thin portion 165 (see FIG. 2). Further, a ring-shaped notch 167 is formed at a radially outer position in the thin portion 165 (see FIG. 6).

  The external gasket 9 has a block portion 91 and a flat plate portion 92. A bottomed hole 93 is formed in the block portion 91, and a through hole 94 is formed in the flat plate portion 92.

  The sealing member 10 is a flat ring member having a through hole 101 formed at the center thereof. The sealing member 10 is sandwiched and compressed between the inner surface 5b of the sealing lid 5 and the opposing surface 131b of the connecting member 13, and seals between the inner surface 5b of the sealing lid 5 and the opposing surface 131b of the connecting member 13. Stop (see FIG. 6). The outer peripheral surface of the sealing member 10 is a sealing taper surface 103 that increases in diameter from the inner surface 5b side of the sealing lid 5 toward the facing surface 131b side of the connecting member 13 (from the upper side to the lower side in FIG. 2). Yes. The inclination angle of the sealing taper surface 103 is 45 °.

  The first insulating member 11 includes a flat insulating peripheral portion 114 and side wall portions 112 extending downward from the four sides of the insulating peripheral portion 114. A through hole 111 is formed in the center of the insulating peripheral portion 114 so as to penetrate the insulating peripheral portion 114 in the thickness direction. The size of the through hole 111 is slightly larger than the outer diameter of the sealing member 10. The insulating peripheral portion 114 is positioned around the sealing member 10 between the inner surface 5 b of the sealing lid 5 and the facing surface 131 b of the connecting member 13, and the sealing member 10 is disposed in the through hole 111. Further, claw-like protrusions 113 are formed on two side wall portions 112 (the side wall portion 112 located on the front side in FIG. 2 and the side wall portion 112 located on the opposite side thereof in FIG. 2) of the four side wall portions 112. Yes.

In the first embodiment, the insulating surrounding portion 114 is thinner than the sealing member 10. Further, the inner peripheral surface constituting the through-hole 111 of the insulating peripheral portion 114 is formed such that the through-hole 111 extends from the inner surface 5b side of the sealing lid 5 toward the facing surface 131b side of the connecting member 13 (from the upper side to the lower side in FIG. 6). The insulating taper surface 115 expands in diameter (see FIG. 6). The inclination angle of the insulating taper surface 115 is 45 °, which is the same as that of the sealing taper surface 103.
6 corresponds to an enlarged cross-sectional view of the cross section of the central portion in the thickness direction of the battery 1 of FIG. 1 as viewed in the direction of arrow A in FIG.

  The second insulating member 15 includes a flat box-shaped base portion 151 and two wall portions 152 that extend upward from the long sides thereof. The base portion 151 is formed with a rectangular through hole 153 extending in a direction connecting the long sides. A through hole 156 is formed in the wall portion 152. The protrusion 113 of the first insulating member 11 is engaged with the through hole 156.

  The sealing lid 5 is a part of the battery case 2 as described above. A through hole 51 is formed in the sealing lid 5. As shown in FIG. 6, the sealing lid 5 has an annular protrusion 53 that protrudes from the inner surface 5 b to the facing surface 131 b side (downward in FIG. 6) of the connecting member 13. The protrusion 53 is formed around the through hole 51.

  The external gasket 9, the sealing member 10, the first insulating member 11, and the second insulating member 15 are all formed of an electrically insulating resin. The sealing member 10 is made of a resin that is more flexible (easily elastically deformed) than the first insulating member 11. Specifically, in Example 1, the sealing member 10 is formed of a PFA resin (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer). The first insulating member 11 is made of PPS resin (polyphenylene sulfide).

  FIG. 3 is a perspective view showing a state in which the parts group shown in FIG. 2 is assembled. In the state of FIG. 3, the sealing lid 5 and the external gasket 9 are overlapped, and the through hole 94 of the external gasket 9 is disposed immediately above the through hole 51 of the sealing lid 5 (FIGS. 2, 3, and 3). (See FIG. 6). Further, the head portion 82 of the bolt 8 is inserted into the bottomed hole 93 of the external gasket 9 and the shaft portion 81 faces upward. Further, the positive external terminal 6 is disposed on the external gasket 9. The positive electrode external terminal 6 is arranged so that the through hole 64 overlaps the through hole 94 of the external gasket 9 and the through hole 65 is positioned on the bottomed hole 93. Therefore, the shaft portion 81 of the bolt 8 protrudes upward through the through hole 65.

  Further, the cylindrical portion 132 of the connecting member 13 is inserted from the inner surface 5 b side of the sealing lid 5. Specifically, the cylindrical portion 132 includes the through hole 101 of the sealing member 10, the through hole 111 of the first insulating member 11, the through hole 51 of the sealing lid 5, the through hole 94 of the external gasket 9, and the positive external terminal 6. And protrudes upward (see FIGS. 2, 3, and 6). At this time, the sealing member 10 is disposed inside the through hole 111 of the first insulating member 11. Furthermore, the cylindrical portion 132 is crimped to the positive electrode external terminal 6 by the projecting portion of the cylindrical portion 132 being pushed outward in the radial direction. Thereby, the connection member 13, the sealing member 10, the 1st insulating member 11, the sealing lid 5, the external gasket 9, the positive electrode external terminal 6, and the volt | bolt 8 are mutually fixed.

  Specifically, as shown in FIG. 6, the connection member 13 is fixed to the sealing lid 5 in such a form that the sealing lid 5 is pressed via the sealing member 10. Further, the sealing member 10 is sandwiched and compressed between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13, and between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13. It is sealed. Moreover, in the first embodiment, the thickness of the insulating peripheral portion 114 of the first insulating member 11 is made thinner than the thickness of the sealing member 10. As a result, the sealing member 10 is brought into intimate contact with the inner surface 5b of the sealing lid 5 and the opposing surface 131b of the connecting member 13, and the gap between the inner surface 5b of the sealing lid 5 and the opposing surface 131b of the connecting member 13 is reliably sealed. Can be stopped.

  By the way, in the present Example 1, the outer peripheral surface of the sealing member 10 increases in diameter from the inner surface 5b side of the sealing lid 5 toward the opposing surface 131b side of the connecting member 13 (from the upper side to the lower side in FIG. 6). A tapered surface 103 is formed. Further, the inner peripheral surface constituting the through-hole 111 of the insulating peripheral portion 114 is formed such that the through-hole 111 extends from the inner surface 5b side of the sealing lid 5 toward the facing surface 131b side of the connecting member 13 (from the upper side to the lower side in FIG. 6). The insulating taper surface 115 expands in diameter (see FIG. 6). The inclination angle of the sealing taper surface 103 and the insulating taper surface 115 with respect to the inner surface 5b of the sealing lid 5 is equal to 45 °.

  For this reason, as described above, when the cylindrical portion 132 of the connecting member 13 is caulked, as shown by an arrow in FIG. The sealing member 10 is expanded radially outward (left side in the cross section of FIG. 7) by pressing and compressing the near annular portion) to the facing surface 131b side (lower side in FIG. 7) of the connecting member 13 ( And the sealing taper surface 103 can be moved radially outward. Accordingly, as shown by an arrow in FIG. 7, the insulating taper surface 115 can be pushed to the sealing lid 5 side (upper side in FIG. 7) by the sealing taper surface 103, and as a result, the insulating peripheral portion 114 is pushed to the sealing lid 5. Can be pressed against the inner surface 5b. Thereby, the first insulating member 11 can be reliably fixed to the sealing lid 5. FIG. 7 is an enlarged view of part B in FIG.

  Therefore, in the sealed battery 1 of the first embodiment, the gap between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13 is reliably sealed by the sealing member 10, and the first insulating member 11 is sealed. The (insulated peripheral portion 114) is a sealed battery that is securely fixed between the sealing lid 5 and the connecting member 13.

  Moreover, as shown in FIG. 7, a part of the outer peripheral end portion 105 including the outer peripheral surface (sealing taper surface 103) of the sealing member 10 is between the insulating peripheral portion 114 and the facing surface 131 b of the connection member 13. The insulating peripheral portion 114 is pressed against the inner surface 5b of the sealing lid 5 in a form interposed (inserted). As a result, the insulating peripheral portion 114 can be pressed more firmly against the sealing lid 5, so that the first insulating member 11 (insulating peripheral portion 114) is more securely fixed between the sealing lid 5 and the connecting member 13. can do.

  Further, as shown in FIG. 6, a sleeve portion 95 is provided downward on the edge portion of the through hole 94 of the external gasket 9. The sleeve portion 95 enters the through hole 51 of the sealing lid 5. Thereby, the cylindrical part 132 of the connection member 13 and the sealing lid 5 are reliably insulated.

  Further, as shown in FIG. 6, the connection member 13 is fixed to the diaphragm 14 by the flange portion 134 of the connection member 13 being airtightly joined (all-around welding) to the outer peripheral edge 142 of the diaphragm 14. A space 17 is formed between the connecting member 13 and the diaphragm 14.

Further, the second insulating member 15 is arranged so that the base 151 and the wall 152 cover the base 131 of the connecting member 13 from below (see FIG. 3). More specifically, the first insulating member 11 is disposed between the walls 152 of the second insulating member 15, and the protrusion of the first insulating member 11 is inserted into the through hole 156 of the second insulating member 15. By engaging the portion 113, the insulating member 90 in which the first insulating member 11 and the second insulating member 15 are integrally fixed is formed.
Further, the current collecting contact portion 162 of the positive electrode current collecting terminal member 16 is inserted into the through hole 153 of the second insulating member 15 (see FIG. 3). Thereby, the positive electrode current collecting terminal member 16 is fixed to the insulating member 90 (second insulating member 15).
The insulating member 90 according to the first embodiment corresponds to an “insulating member” recited in the claims.

  Through holes 154 and 155 are formed in the base 151 of the second insulating member 15. Through the through hole 154 on the upper surface, the stepped portion 141 of the diaphragm 14 and the thin portion 165 of the current collecting contact portion 162 of the positive current collecting terminal member 16 are in contact. Moreover, both are joined (welded) through the through-hole 155 of the lower surface.

  Note that the space 17 between the connection member 13 and the diaphragm 14 communicates with the outside of the battery case 2 through the through hole 133 of the cylindrical portion 132 of the connection member 13, so that the atmospheric pressure in the space 17 becomes atmospheric pressure. (See FIG. 6). On the other hand, the space 18 between the diaphragm 14, the current collecting contact portion 162, and the base portion 151 is not in communication with the outside of the battery case 2, and the internal space of the battery case 2 (the space where the electrode body 3 is disposed). It communicates (it can ventilate). For this reason, when the internal pressure of the battery case 2 rises, the pressure in the space 18 also rises, so that a force is applied to the diaphragm 14 to push it upward. Further, since the central portion of the lower surface of the stepped portion 141 of the diaphragm 14 faces the internal space of the battery case 2 through the through hole 166 of the thin portion 165, when the internal pressure of the battery case 2 rises, the step of the diaphragm 14 is increased. A force that pushes upward is applied to the shaped portion 141.

  Further, in the sealed battery 1 according to the first embodiment, the positive electrode current collector terminal member 16, the diaphragm 14, the connection member 13, the sealing member 10, and the insulating member 90 (the first insulating member 11 and the second insulating member 15). A current interruption mechanism 80 is configured (see FIG. 6). The current interruption mechanism 80 interrupts the current flowing through the electrode body 3 when the internal pressure of the battery case 2 reaches the operating pressure. The operation of the current interrupt mechanism 80 will be described in detail later.

  As described above, in the sealed battery 1 according to the first embodiment, the connection member 13 is fixed to the sealing lid 5 in such a form that the sealing lid 5 is pressed via the sealing member 10. For this reason, the diaphragm 14 fixed to the connection member 13 is also fixed to the sealing lid 5. Further, the insulating taper surface 115 of the insulating member 90 (first insulating member 11) is pushed toward the sealing lid 5 by the sealing taper surface 103 of the sealing member 10, so that the insulating peripheral portion 114 is moved to the inner surface 5 b of the sealing lid 5. Is pressed against. Thereby, the insulating member 90 fixed to the positive electrode current collecting terminal member 16 can be reliably fixed to the sealing lid 5.

  In such a sealed battery 1, the position (posture) of the positive current collecting terminal member 16 with respect to the diaphragm 14 is fixed (the positive current collecting terminal member 16 does not move in the battery case 2). There is no possibility that the operating pressure of the current interruption mechanism 80 (the internal pressure of the battery that is separated from the positive electrode current collecting terminal member 16 due to the deformation of the diaphragm 14) varies due to stress applied to the joint W with the electric terminal member 16.

  In the first embodiment, the diaphragm 14 and the positive electrode current collecting terminal member 16 are joined. However, the diaphragm 14 and the positive current collecting terminal member 16 may be joined (only contacted). Even in such a case, by fixing each member as described above, the contact position (connection position) between the diaphragm 14 and the positive current collecting terminal member 16 can be fixed. There is no risk of variations.

  Next, the operation of the current interrupt mechanism 80 will be described. Specifically, for example, when the internal pressure of the battery case 2 rises and reaches an operating pressure (for example, 750 kPa) due to overcharging of the sealed battery 1, the current flowing through the electrode body 3 is cut off as follows. To do.

  When the internal pressure of the battery case 2 rises, the pressure in the space 18 also rises, so that a force is applied to the diaphragm 14 to push it upward. Further, a force to push upward is applied to the stepped portion 141 of the diaphragm 14 through the through hole 166 of the thin-walled portion 165. Then, as the internal pressure of the battery case 2 increases, the diaphragm 14 is deformed in a direction away from the positive electrode current collector terminal member 16 (upward in FIG. 6) due to a pressure difference with the space 17. At this time, the thin portion 165 of the positive electrode current collector terminal member 16 joined to the stepped portion 141 of the diaphragm 14 is also deformed together with the stepped portion 141 of the diaphragm 14.

  When the internal pressure of the battery case 2 reaches a predetermined operating pressure, as shown in FIG. 8, the thin-walled portion 165 breaks at the position of the notch 167, and the diaphragm 14 and the positive electrode current collecting terminal member 16 are separated. . Thereby, electricity supply between the diaphragm 14 and the electrode body 3 is interrupted | blocked. Specifically, the current flowing through the electrode body 3 is cut off through the path of (positive electrode external terminal 6) → (connecting member 13) → (diaphragm 14) → (positive electrode current collecting terminal member 16). Thereby, the charge (overcharge) of the sealed battery 1 is stopped.

Next, a method for manufacturing the sealed battery 1 will be described.
First, the positive electrode plate 20 and the negative electrode plate 30 are respectively produced by a known method (see FIGS. 4 and 5). Then, a separator (not shown) is interposed between the positive electrode plate 20 and the negative electrode plate 30, and these are wound to form a flat wound electrode body 3 (see FIG. 1).

  Further, the cylindrical portion 132 of the connecting member 13 is inserted into the through hole 101 of the sealing member 10 and the through hole 111 of the first insulating member 11, and on the facing surface 131 b of the base portion 131 of the connecting member 13, An insulating peripheral portion 114 of the sealing member 10 and the first insulating member 11 is disposed (see FIGS. 2 and 6). At this time, the sealing member 10 is disposed inside the through hole 111 of the first insulating member 11.

  An external gasket 9 is disposed on the outer surface 5 c of the sealing lid 5. At this time, the through hole 51 of the sealing lid 5 and the through hole 94 of the external gasket 9 are overlapped, and the sleeve portion 95 of the external gasket 9 is inserted into the through hole 51, and the block portion 91 is sealed more than the through hole 51. The lid 5 is positioned inside the width direction. Further, after the bolt 8 is disposed in the bottomed hole 93 of the block portion 91, the positive external terminal 6 is disposed on the external gasket 9. At this time, the through hole 64 is overlapped with the through hole 94 while the shaft portion 81 of the bolt 8 is inserted into the through hole 65 of the positive electrode external terminal 6.

  Next, the through hole 51 is inserted through the cylindrical portion 132 of the connecting member 13 to which the sealing member 10 and the first insulating member 11 are attached from below the sealing lid 5. Thereby, the cylindrical part 132 will be in the state which penetrated the sealing lid 5, the external gasket 9, and the positive electrode external terminal 6. FIG. Thereafter, by tightening the cylindrical portion 132, the components assembled so far are fixed to each other, and the connection member 13 and the positive external terminal 6 are electrically connected.

  At this time, as indicated by an arrow in FIG. 7, a part of the sealing member 10 (an annular portion close to the through hole 101) is placed on the facing surface 131 b side of the connecting member 13 (FIG. 7, the sealing member 10 can be expanded radially outward (left side in the cross section of FIG. 7) and the sealing taper surface 103 can be moved radially outward. Accordingly, as shown by an arrow in FIG. 7, the insulating taper surface 115 can be pushed to the sealing lid 5 side (upper side in FIG. 7) by the sealing taper surface 103, and as a result, the insulating peripheral portion 114 is pushed to the sealing lid 5. Can be pressed against the inner surface 5b. Thereby, the first insulating member 11 can be fixed to the sealing lid 5.

Next, the outer peripheral edge 142 of the diaphragm 14 is joined to the flange portion 134 of the connecting member 13 (full circumference welding).
Further, the positive current collecting terminal member 16 is attached to the second insulating member 15. Specifically, the current collecting contact portion 162 of the positive electrode current collecting terminal member 16 is inserted into the through hole 153 of the base portion 151 of the second insulating member 15. Thereafter, the second insulating member 15 to which the positive current collecting terminal member 16 is attached is fixed to the first insulating member 11. Specifically, a through hole 156 provided in the wall portion 152 of the second insulating member 15 while being arranged so as to sandwich the first insulating member 11 between the two wall portions 152 of the second insulating member 15. Then, the protrusion 113 of the first insulating member 11 is engaged. Thereby, the first insulating member 11 and the second insulating member 15 are integrally fixed to form the insulating member 90, and the positive current collecting terminal member 16 is fixed to the insulating member 90. Furthermore, the stepped portion 141 of the diaphragm 14 and the thin portion 165 of the positive electrode current collecting terminal member 16 are in contact with each other through the through hole 154 of the second insulating member 15 (see FIG. 6).

Further, the negative electrode terminal structure 70 including the negative electrode external terminal 7 is attached to the sealing lid 5.
Next, the current collector connection part 161 of the positive electrode current collector terminal member 16 is welded to the positive electrode active material layer uncoated part 20 c of the electrode body 3. Further, a negative electrode current collecting terminal member (not shown) of the negative electrode terminal structure 70 is welded to the negative electrode active material layer uncoated portion 30 c of the electrode body 3.

  Next, the electrode body 3 is accommodated in the battery case 2. Specifically, the electrode body 3 in which the sealing lid 5, the positive terminal structure 60, and the negative terminal structure 70 are integrated is inserted into the case body 4. Then, with the sealing lid 5 closing the opening of the case main body 4, the case main body 4 and the sealing lid 5 are welded all around by laser welding. Thereby, the battery case 2 which accommodated the electrode body 3 inside is completed. Subsequently, the electrolytic solution 50 is injected into the battery case 2 through a liquid injection hole (not shown) of the battery case 2 (sealing lid 5), and the electrode body 3 in the battery case 2 is impregnated. Thereafter, the injection hole (not shown) is sealed to complete the sealed battery 1 according to Example 1 (see FIG. 1).

(Example 2)
Next, the sealed battery 201 according to Example 2 will be described.
The sealed battery 201 of Example 2 is different from the sealed battery 1 of Example 1 only in the form of the sealing member and the insulating member (first insulating member), and the others are the same. Therefore, here, a different point from Example 1 is demonstrated and description is abbreviate | omitted about the same point.

  The sealing member 10 of Example 1 has a sealing taper surface whose outer peripheral surface expands from the inner surface 5b side of the sealing lid 5 toward the opposing surface 131b side of the connecting member 13 (from the upper side to the lower side in FIG. 2). 103 (see FIGS. 2 and 6). On the other hand, the diameter of the sealing member 210 of the second embodiment decreases from the inner surface 5b side of the sealing lid 5 toward the facing surface 131b side of the connecting member 13 (from the top to the bottom in FIG. 9). The sealing taper surface 213 is used (see FIG. 9). FIG. 9 is a partially enlarged view of the current interruption mechanism according to the second embodiment, and corresponds to the enlarged view of the B part in FIG. 6.

  Further, the first insulating member 11 of the first embodiment has an inner peripheral surface constituting the through hole 111 of the insulating peripheral portion 114 from the inner surface 5b side of the sealing lid 5 to the opposing surface 131b side of the connecting member 13 (upward in FIG. 6). The insulating taper surface 115 in which the diameter of the through hole 111 is increased toward the lower side (see FIG. 6). On the other hand, in the first insulating member 220 of the second embodiment, the inner peripheral surface constituting the through hole 221 of the insulating peripheral portion 224 is directed from the inner surface 5b side of the sealing lid 5 to the facing surface 131b side of the connecting member 13. Accordingly, the insulating taper surface 225 in which the diameter of the through hole 221 is reduced (see FIG. 9).

  Therefore, in the second embodiment, when the cylindrical portion 132 of the connecting member 13 is caulked, as shown by an arrow in FIG. The sealing member 210 is expanded radially outward (left side in the cross section of FIG. 9) by pressing and compressing the near annular portion) toward the facing surface 131b side (lower side in FIG. 9) of the connecting member 13 ( And the sealing taper surface 213 can be moved radially outward. As a result, as shown by an arrow in FIG. 9, the insulating taper surface 225 can be pushed by the sealing taper surface 213 toward the facing surface 131 b of the connecting member 13 (downward in FIG. 9). 224 can be pressed against the facing surface 131 b of the connecting member 13. Thereby, the first insulating member 220 can be reliably fixed to the connection member 13.

  Further, the sealing member 210 is sandwiched and compressed between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13, and between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13. It is sealed. Moreover, also in the second embodiment, as in the first embodiment, the thickness of the insulating peripheral portion 224 of the first insulating member 220 is made thinner than the thickness of the sealing member 210. As a result, the sealing member 210 is brought into close contact with the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13, and the space between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13 is reliably sealed. Can be stopped.

  Therefore, in the sealed battery 201 according to the second embodiment, the sealing member 210 reliably seals the space between the inner surface 5b of the sealing lid 5 and the facing surface 131b of the connecting member 13, and the first insulating member 220. A sealed battery in which (insulating peripheral portion 224) is securely fixed between the sealing lid 5 and the connecting member 13 is obtained.

  In addition, as shown in FIG. 9, a part of the outer peripheral end 215 including the outer peripheral surface (sealing taper surface 213) of the sealing member 210 is between the insulating peripheral portion 224 and the inner surface 5 b of the sealing lid 5. The insulating peripheral portion 224 is pressed against the facing surface 131b of the connecting member 13 in an interposed (inserted) form. Accordingly, the insulating peripheral portion 224 can be pressed more firmly against the facing surface 131b of the connecting member 13, so that the first insulating member 220 (insulating peripheral portion 224) is interposed between the sealing lid 5 and the connecting member 13. It can be fixed more reliably.

  Even in such a sealed battery 201, the position (posture) of the positive electrode current collector terminal member 16 with respect to the diaphragm 14 is fixed (the positive electrode current collector terminal in the battery case 2) as in the sealed battery 1 of the first embodiment. Member 16 does not move), and stress is applied to the joint W between the diaphragm 14 and the positive current collecting terminal member 16, so that the operating pressure of the current interrupt mechanism is deformed (the battery 14 is deformed and separated from the positive current collecting terminal member 16). There is no risk of variations in the internal pressure.

  In the second embodiment, the diaphragm 14 and the positive electrode current collecting terminal member 16 are joined. However, the diaphragm 14 and the positive current collecting terminal member 16 may be joined (only contacted). Even in such a case, by fixing each member as described above, the contact position (connection position) between the diaphragm 14 and the positive current collecting terminal member 16 can be fixed. There is no risk of variations.

  In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be appropriately modified and applied without departing from the gist thereof. Needless to say.

For example, in Examples 1 and 2, the current interruption mechanism is provided on the positive electrode external terminal 6 side, but may be provided on the negative electrode external terminal 7 side. Moreover, you may make it provide in the both external terminal side.
In the first and second embodiments, the insulating member 90 is formed by the two members of the first insulating member 11 and the second insulating member 15, but the insulating member may be formed by one member.

1,201 Sealed battery 2 Battery case 3 Electrode body 4 Case body 5 Sealing lid 5b Inner surface 53 Protrusion 6 Positive electrode external terminal 10, 210 Sealing member 103, 213 Sealing taper surface 105, 215 Outer peripheral end 11, 220 1 Insulating member 111, 221 Through hole 114 Insulating peripheral portion 115, 225 Insulating taper surface 13 Connecting member 131b Opposing surface 14 Diaphragm 15 Second insulating member 16 Positive current collecting terminal member 20 Positive electrode plate 30 Negative electrode plate 80 Current blocking mechanism 90 Insulating member

Claims (7)

In a sealed battery comprising an external terminal, an electrode body, a battery case, and a current interruption mechanism that interrupts a current flowing through the electrode body when an internal pressure of the battery case reaches an operating pressure,
The battery case has a case main body that houses the electrode body, and a sealing lid that seals the opening of the case main body.
The current interruption mechanism is
A current collecting terminal member connected to the electrode body;
A diaphragm connected to the current collecting terminal member and deformed in a direction away from the current collecting terminal member due to an increase in internal pressure of the battery case;
A connection member fixed to the diaphragm and electrically connecting the external terminal and the diaphragm, the connection member having a facing surface facing the inner surface of the sealing lid;
A sealing member that is sandwiched and compressed between the inner surface of the sealing lid and the facing surface of the connecting member, and seals between the inner surface of the sealing lid and the facing surface of the connecting member;
An insulating peripheral portion that is positioned around the sealing member between the inner surface of the sealing lid and the facing surface of the connecting member, and in which the sealing member is disposed in a through hole that penetrates the sealing member in the thickness direction; An insulating member having an insulating member fixed to the current collecting terminal member,
The insulating peripheral portion is thinner than the sealing member,
The connection member is fixed to the sealing lid in a form of pressing the sealing lid through the sealing member,
The outer peripheral surface of the sealing member has a sealing taper surface whose diameter increases from the inner surface side of the sealing lid toward the opposing surface side of the connection member,
The inner peripheral surface constituting the through hole of the insulating peripheral portion has an insulating taper surface in which the through hole expands from the inner surface side of the sealing lid toward the opposing surface side of the connection member,
The sealing lid presses and compresses at least a part of the sealing member toward the facing surface of the connecting member to expand the sealing member radially outward and the sealing taper surface has a diameter. The insulating taper is moved toward the sealing lid surface, and the insulating taper surface is pushed toward the sealing lid by pressing the insulating taper surface against the inner surface of the sealing lid, thereby fixing the insulating member to the sealing lid. A sealed battery. The sealed battery according to claim 1,
A part of the outer peripheral end portion including the outer peripheral surface of the sealing member is interposed between the insulating peripheral portion and the facing surface of the connecting member, and the insulating peripheral portion is disposed on the sealing lid. A sealed battery that is pressed against the inner surface. The sealed battery according to claim 1 or 2,
The sealing lid has a protruding portion that protrudes from the inner surface of the sealing lid toward the facing surface of the connection member,
The projecting portion of the sealing lid presses and compresses a part of the sealing member toward the facing surface of the connecting member, thereby expanding the sealing member radially outward and the sealing taper. The insulating peripheral portion is pressed against the inner surface of the sealing lid by moving the surface outward in the radial direction and pressing the insulating tapered surface toward the sealing lid by the sealing taper surface, and the insulating member is pressed against the sealing lid. Sealed battery. In a sealed battery comprising an external terminal, an electrode body, a battery case, and a current interruption mechanism that interrupts a current flowing through the electrode body when an internal pressure of the battery case reaches an operating pressure,
The battery case has a case main body that houses the electrode body, and a sealing lid that seals the opening of the case main body.
The current interruption mechanism is
A current collecting terminal member connected to the electrode body;
A diaphragm connected to the current collecting terminal member and deformed in a direction away from the current collecting terminal member due to an increase in internal pressure of the battery case;
A connection member fixed to the diaphragm and electrically connecting the external terminal and the diaphragm, the connection member having a facing surface facing the inner surface of the sealing lid;
A sealing member that is sandwiched between the inner surface of the sealing lid and the facing surface of the connecting member and seals between the inner surface of the sealing lid and the facing surface of the connecting member;
An insulating peripheral portion that is positioned around the sealing member between the inner surface of the sealing lid and the facing surface of the connecting member, and in which the sealing member is disposed in a through hole that penetrates the sealing member in the thickness direction; An insulating member having an insulating member fixed to the current collecting terminal member,
The insulating peripheral portion is thinner than the sealing member,
The connection member is fixed to the sealing lid in a form of pressing the sealing lid through the sealing member,
The outer peripheral surface of the sealing member has a sealing taper surface whose diameter decreases from the inner surface side of the sealing lid toward the opposing surface side of the connection member,
The inner peripheral surface constituting the through hole of the insulating peripheral portion has an insulating taper surface in which the diameter of the through hole is reduced from the inner surface side of the sealing lid toward the opposing surface side of the connection member,
The sealing lid presses and compresses at least a part of the sealing member toward the facing surface of the connecting member to expand the sealing member radially outward and the sealing taper surface has a diameter. The insulating peripheral portion is pressed against the opposing surface of the connecting member by moving the insulating taper surface toward the opposing surface side of the connecting member by the sealing taper surface. A sealed battery that is fixed to a connecting member. The sealed battery according to claim 4,
A part of the outer peripheral end portion including the outer peripheral surface of the sealing member is interposed between the insulating peripheral portion and the inner surface of the sealing lid, and the insulating peripheral portion is opposed to the connection member. A sealed battery that is pressed against the surface. The sealed battery according to claim 4 or 5, wherein
The sealing lid has a protruding portion that protrudes from the inner surface of the sealing lid toward the facing surface of the connection member,
The projecting portion of the sealing lid presses and compresses a part of the sealing member toward the facing surface of the connecting member, thereby expanding the sealing member radially outward and the sealing taper. The insulating peripheral portion is pressed against the facing surface of the connecting member by moving the surface outward in the radial direction and pressing the insulating tapered surface toward the facing surface of the connecting member by the sealing taper surface. A sealed battery in which a member is fixed to the connecting member. A sealed battery according to any one of claims 1 to 6,
The sealed battery in which the inclination angle of the sealing taper surface and the insulating taper surface with respect to the inner surface of the sealing lid is 45 °.

Images