JP6610071B2 - Power storage device - Google Patents

Description

  The technology disclosed in this specification relates to a power storage device.

  Patent Document 1 discloses a power storage device including a current interrupt device. The power storage device has a case that accommodates the electrode assembly, and the case has an attachment hole that communicates the inside and outside of the case. The current interrupt device is attached to a mounting hole of the case, and includes a connection terminal, a holder, and a current-carrying plate. The connection terminal is attached to the attachment hole of the case and has a through hole that communicates the inside and outside of the case. The holder is disposed in the case and is attached to an end portion of the connection terminal on the case inner side. An energizing plate is fixed to the lower end surface of the holder by heat caulking. The conductive plate electrically connects the electrode assembly and the connection terminal in the conductive state, and electrically disconnects the electrode assembly and the connection terminal in the non-conductive state. When the energization plate is changed from the conductive state to the non-conductive state, the energization path connecting the electrode assembly and the connection terminal is interrupted.

JP 2013-225500 A

  In this type of power storage device, the performance of the power storage device may deteriorate due to moisture entering the power storage device. In the power storage device of Patent Document 1, a through hole is formed in the electrode terminal. For this reason, moisture may enter the internal space of the holder through the through hole, and moisture may enter the case from between the holder and the current-carrying plate. In order to prevent such intrusion of moisture, a sealing member such as an O-ring may be disposed between the holder and the current-carrying plate. However, a sealing member such as an O-ring may not be sufficient to suppress moisture from entering the power storage device.

  A power storage device disclosed in this specification includes an electrode assembly housed in a case, a connection terminal provided in a mounting hole of the case and having a through hole communicating with the inside and outside of the case, and housed in the case, A current interrupting device that switches between a conductive state in which the solid body and the connection terminal are electrically connected and a non-conductive state in which the electrode assembly and the connection terminal are electrically disconnected from each other; The current interrupt device is attached to an end portion of the connection terminal inside the case, and electrically connects the insulating holder having an internal space communicating with the through hole of the connection terminal, and the electrode assembly and the connection terminal in a conductive state. On the other hand, in the non-conducting state, the electrode assembly and the connection terminal are electrically disconnected, and the current supply plate is attached to the holder, and the inner space of the holder is The mounting surface of the energizing plate in the holder and the contact surface of the energizing plate with the holder are in contact with each other, and a first recess is provided on one of the mounting surface of the holder and the abutting surface of the energizing plate. A liquid gasket is filled in the space formed by the other mounting surface of the holder, the other contact surface of the energizing plate, and the first recess, and the mounting surface of the holder and the energizing plate are contacted by the liquid gasket. The space between the surfaces is sealed.

  In the above power storage device, a recess is provided on one of the mounting surface of the holder and the contact surface of the energizing plate, and a liquid gasket is formed in a space formed by the other of the mounting surface of the holder and the contact surface of the energizing plate and the recess. Is filled. And between the attachment surface of a holder and the contact surface of an electricity supply board is sealed with the liquid gasket with which the recessed part was filled. Generally, the moisture permeability coefficient of a liquid gasket is lower than the moisture permeability coefficient of a sealing member such as an O-ring. For this reason, compared with the case where an O-ring is provided between the holder and the energization, the intrusion of moisture into the case can be suppressed.

1 is a longitudinal sectional view of a power storage device according to Embodiment 1. FIG. The bottom view of the electricity supply board of an electric current interruption apparatus. Sectional drawing when an electric current interruption apparatus is cut | disconnected by the broken line III-III of FIG. The enlarged view in the broken-line part 200 of FIG. FIG. 6A is a diagram (1) illustrating a manufacturing process of the power storage device according to the first embodiment. FIG. 2 is a diagram (2) illustrating a manufacturing process of the power storage device according to the first embodiment. FIG. 3 is a diagram (3) illustrating a manufacturing process of the power storage device according to the first embodiment. FIG. 4 is a diagram (4) illustrating a manufacturing process of the power storage device according to the first embodiment. The figure which shows the modification of an electric current interruption apparatus.

  The main features of the embodiments described below are listed. The technical elements described below are independent technical elements and exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Feature 1) An O-ring may be accommodated in the first recess. According to such a structure, the injection quantity of the liquid gasket with which a 1st recessed part is filled can be reduced.

(Feature 2) The first recess may be provided on the mounting surface of the holder. In general, the thickness of the energizing plate is thicker than the thickness of the holder. For this reason, the freedom degree of the size and shape of a 1st recessed part can be raised by providing a 1st recessed part in the attachment surface of a holder.

(Characteristic 3) The 1st recessed part may be attached to the attachment surface of a holder. The mounting surface of the holder is further provided with a second recess provided at an interval inside or outside the first recess, and an O-ring may be accommodated in the second recess. When the liquid gasket and the O-ring are accommodated in the same recess, the shape and size of the recess are defined by the O-ring. On the other hand, the degree of freedom of the size and shape of the first recess filled with the liquid gasket can be enhanced by filling the liquid gasket into the first recess and accommodating the O-ring in the second recess.

  Hereinafter, the power storage device 100 according to the first embodiment will be described. As shown in FIG. 1, the power storage device 100 includes a case 1, an electrode assembly 3 accommodated in the case 1, and connection terminals 5 and 7 as electrode terminals fixed to the case 1. The electrode assembly 3 and the connection terminals 5 and 7 are electrically connected. The power storage device 100 includes a current interrupt device 10 disposed between the electrode assembly 3 and the connection terminal 7. The inside of the case 1 is injected with an electrolytic solution, and the electrode assembly 3 is immersed in the electrolytic solution.

  The case 1 is made of metal and is a substantially rectangular parallelepiped box-shaped member. The case 1 includes a main body 111 and a lid portion 112 fixed to the main body 111. The lid part 112 is detachable from the main body 111. The lid part 112 covers the upper part of the main body 111. Mounting holes 81 and 82 are formed in the lid portion 112. The connection terminal 5 communicates with the inside and outside of the case 1 through the attachment hole 81, and the connection terminal 7 communicates with the inside and outside of the case 1 through the attachment hole 82.

  The electrode assembly 3 includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet. The electrode assembly 3 is configured by laminating a plurality of laminated bodies including a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet and the negative electrode sheet include a current collecting member and an active material layer formed on the current collecting member. As a current collection member, what is used for a positive electrode sheet is aluminum foil, for example, and what is used for a negative electrode sheet is copper foil, for example. The electrode assembly 3 includes a positive current collecting tab 51 and a negative current collecting tab 52. The positive electrode current collecting tab 51 is formed on the upper end portion of the positive electrode sheet. The negative electrode current collecting tab 52 is formed on the upper end portion of the negative electrode sheet. The positive electrode current collecting tab 51 and the negative electrode current collecting tab 52 protrude above the electrode assembly 3. The positive electrode current collecting tab 51 is fixed to the positive electrode lead 53. The negative electrode current collecting tab 52 is fixed to the negative electrode lead 54.

  The positive electrode lead 53 is connected to the positive electrode current collecting tab 51 and the connection terminal 5. The positive electrode current collecting tab 51 and the connection terminal 5 are electrically connected via the positive electrode lead 53. An insulating member 70 is disposed between the positive electrode lead 53 and the case 1. The insulating member 70 insulates the positive electrode lead 53 and the lid portion 112 of the case 1.

  The negative electrode lead 54 is connected to the negative electrode current collecting tab 52 and the connection terminal 56. The connection terminal 56 is electrically connected to the connection terminal 7 via the current interrupt device 10. Therefore, the negative electrode current collection tab 52 and the connection terminal 7 are electrically connected via the negative electrode lead 54, the connection terminal 56, and the current interrupt device 10. Thereby, an energization path for connecting the electrode assembly 3 and the connection terminal 7 is formed. The current interrupt device 10 can interrupt this energization path. The configuration of the current interrupt device 10 will be described later. An insulating member 71 is disposed between the negative electrode lead 54 and the case 1. The insulating member 71 insulates the negative electrode lead 54 from the case 1.

  Resin gaskets 62 and 63 are disposed on the upper surface of the lid portion 112. The gasket 62 includes a protruding portion 66 that protrudes upward from the lid portion 112 and a flat plate portion 68 that extends along the lid portion 112. The protruding portion 66 is disposed on the center side of the attachment hole 81 of the lid portion 112, and the flat plate portion 68 is disposed on the attachment hole 81 side of the lid portion 112. External terminals 60 are disposed on the upper surface of the gasket 62 along the shape of the upper surface of the gasket 62. The head of the bolt 64 is disposed in a bottomed hole 62 a formed in the protrusion 66. The shaft portion of the bolt 64 protrudes upward through the opening of the external terminal 60. The connection terminal 5, the external terminal 60, and the bolt 64 are electrically connected to each other and constitute a positive terminal. The configuration of the gasket 63, the external terminal 61, and the bolt 65 is the same as the configuration of the gasket 62, the external terminal 60, and the bolt 64 described above. The connection terminal 7, the external terminal 61, and the bolt 65 are electrically connected to each other and constitute a negative terminal.

  The connection terminal 7 will be described with reference to FIG. As shown in FIG. 3, the connection terminal 7 is caulked and fixed to the lid portion 112. The connection terminal 7 includes a cylindrical portion 94, a base portion 95, and a fixing portion 96. The cylindrical portion 94 is inserted into the mounting hole 82. A through hole 97 that penetrates the inside and outside of the case 1 is formed in the cylindrical portion 94. The base portion 95 is formed in an annular shape. The base portion 95 is fixed to the lower end portion of the cylindrical portion 94. The base portion 95 is disposed inside the case 1. A recess 98 is formed in the base portion 95. The recess 98 communicates with the through hole 97, and the inside of the recess 98 is maintained at atmospheric pressure. The fixed portion 96 is formed in an annular shape and is disposed at the upper end portion of the cylindrical portion 94. The fixing part 96 is disposed outside the case 1. The connection terminal 7 is fixed to the lid portion 112 of the case 1 by a fixing portion 96. Note that the fixing portion 96 of the connection terminal 7 before performing the caulking process described later is not bent with respect to the cylindrical portion 94. That is, the fixed portion 96 extends in the axial direction of the axis of the cylindrical portion 94. By caulking the tip of the connection terminal 7, the tip of the connection terminal 7 is bent and becomes a fixed portion 96.

  Next, the structure of the electric current interruption apparatus 10 is demonstrated using FIGS. As shown in FIG. 3, the current interrupt device 10 includes an energizing plate 20, a first reversing plate 30, a second reversing plate 40, and a holder 80.

  The first reversing plate 30 is a conductive diaphragm that is circular when viewed in plan, and is convex downward. The first reversing plate 30 has a central portion 32 and an outer peripheral portion 31. The central portion 32 of the first reversing plate 30 is connected to the energizing plate 20, and the recess 98 of the connection terminal 7 is covered with the first reversing plate 30. Since the inside of the recess 98 is maintained at atmospheric pressure, atmospheric pressure acts on the upper surface of the first reversing plate 30. The outer peripheral portion 31 of the first reversing plate 30 is welded to the base portion 95 of the connection terminal 7.

  The 2nd inversion board 40 is a metal member. The second inversion plate 40 is disposed below the energization plate 20. The 2nd inversion board 40 has the center part 42 and the outer peripheral part 41, and the center part 42 is convex below. The outer peripheral part 41 of the 2nd inversion board 40 is being fixed to the lower surface of the electricity supply board 20 by welding. A protruding portion 43 is provided on the upper surface of the central portion 42. Above the protrusion 43, the central portion 22 of the energizing plate 20 is located. The pressure in the case 1 acts on the lower surface of the second reversing plate 40.

  The energization plate 20 is a metal member and has conductivity. The energization plate 20 is formed in a circular shape in plan view, and is disposed between the first reverse plate 30 and the second reverse plate 40. The energizing plate 20 has a central portion 22 and an outer peripheral portion 21. The central portion 22 of the energizing plate 20 is connected to the central portion 32 of the first reversing plate 30. A connection terminal 56 is connected to the outer peripheral portion 21 of the energization plate 20. A groove portion 20 a is formed around the center portion 22 on the lower surface of the current-carrying plate 20. The mechanical strength of the energizing plate 20 at the position where the groove 20a is formed is lower than the mechanical strength of the energizing plate 20 at a position other than the groove 20a. As shown in FIGS. 2 and 3, a plurality of through holes 20 b are provided in the outer peripheral portion 21 of the energizing plate 20. The plurality of through holes 20b are provided on the radially outer side of the energizing plate 20 with respect to the region where the second reversing plate 40 is welded. The plurality of through holes 20b are arranged at equal intervals in the circumferential direction of the holder 80 (shown in FIG. 2). In the first embodiment, the four through holes 20 b are provided in the circumferential direction of the holder 80 with an interval of 90 °. The insertion portion 76 of the holder 80 is inserted through the plurality of through holes 20b. Hereinafter, the surface of the upper surface of the energizing plate 20 that is in contact with the holder 80 is referred to as an abutting surface 20 c of the energizing plate 20.

  The holder 80 holds and accommodates the base portion 95 of the connection terminal 7 and the first reversing plate 30 in the inner peripheral portion thereof. A through hole 79a is formed at the upper end of the holder 80, and the cylindrical portion 94 of the connection terminal 7 is inserted into the through hole 79a. The holder 80 is formed of an insulating member having elasticity. For the holder 80, for example, polyphenyl sulfide (PPS) is used. The holder 80 can be manufactured by molding an insulating material. The material of the holder 80 is not limited to the above-described PPS, and is a material having insulating properties and electrolytic solution resistance (for example, perfluoroalkoxyalkane (PFA), polytetrafluoroethylene (PTFE), polypropylene (PP), etc.). I just need it.

  The holder 80 includes an upper end portion 79, a central portion 78, and a lower end portion 77. The upper end 79 is formed in an annular shape having a through hole 79a at the center thereof. As described above, the cylindrical portion 94 of the connection terminal 7 is inserted into the through hole 79 a of the upper end portion 79. The upper end 79 is disposed between the lower surface of the lid portion 112 of the case 1 and the upper surface of the base portion 95 of the connection terminal 7. That is, the lower surface of the lid portion 112 is in contact with the upper surface of the upper end portion 79, and the upper surface of the base portion 95 is in contact with the lower surface of the upper end portion 79. The lower surface of the lid portion 112 and the upper surface of the base portion 95 are insulated by the upper end portion 79.

  The central portion 78 is formed between the upper end portion 79 and the lower end portion 77, and extends downward from the outer peripheral edge of the upper end portion 79. The central portion 78 is formed in an annular shape, and accommodates the base portion 95 and the first reversing plate 30 therein. The energizing plate 20 is in contact with the mounting surface 78 a of the central portion 78. A recess 74 is formed in the mounting surface 78a with which the energizing plate 20 of the central portion 78 abuts. The concave portion 74 is formed in an annular shape when the holder 80 is viewed from the bottom, and goes around the outside of the central portion 22 of the energizing plate 20. The cross-sectional shape of the recess 74 (that is, the cross-sectional shape in the direction perpendicular to the axis along which the recess 74 extends) is rectangular, and the depth d is greater than the diameter of the O-ring 72 (the diameter in an unloaded state) described later. It is made smaller (shown in FIG. 4). The recess 74 is formed on the radially inner side of the energizing plate 20 with respect to the through hole 20b of the energizing plate 20. The recess 74 is filled with a liquid gasket 73 and accommodates an O-ring 72. The liquid gasket 73 is in a dry state. Since the depth d of the recess 74 is smaller than the diameter of the O-ring 72, the O-ring 72 is accommodated in the recess 74 in a compressed state. In other words, the O-ring 72 is in contact with the bottom surface of the recess 74 and the contact surface 20c of the energizing plate 20, and is compressed by these surfaces. The liquid gasket 73 and the O-ring 72 seal between the mounting surface 78a of the holder 80 and the contact surface 20c of the energizing plate 20.

  The lower end portion 77 is formed in a partial region of the lower surface of the central portion 78. Specifically, the lower end portion 77 is formed at a position corresponding to the through hole 20 b of the energization plate 20 when the energization plate 20 is assembled to the holder 80. The lower end portion 77 protrudes downward from the mounting surface 78 a of the central portion 78 and includes an insertion portion 76 and a heat caulking portion 75.

  The insertion portion 76 is formed in a shape (that is, a cylindrical shape) following the through hole 20b. The length of the insertion portion 76 in the axial direction is slightly longer than the length of the through hole 20b in the axial direction, and the diameter of the insertion portion 76 is slightly smaller than the diameter of the through hole 20b. The axis of the insertion portion 76 extends downward from the lower surface (mounting surface 78a) of the central portion 78.

  The heat caulking portion 75 is provided at the lower end of the insertion portion 76 and is in contact with the lower surface of the energizing plate 20. That is, the diameter of the heat caulking portion 75 is larger than the diameter of the insertion portion 76. Therefore, the energizing plate 20 is fixed to the holder 80 by assembling the lower end 77 of the holder 80 into the through hole 20b of the energizing plate 20. The heat caulking portion 75 is formed by a heat caulking process described later. That is, by performing the heat caulking process, the diameter of the heat caulking portion 75 becomes larger than the diameter of the insertion portion 76. For this reason, before the heat caulking process is performed, the heat caulking portion 75 extends in the axial direction of the insertion portion 76. That is, the insertion part 76 and the heat caulking part 75 before the heat caulking process constitute one columnar part extending in the axial direction.

  Here, the interruption | blocking operation | movement of the electric current interruption apparatus 10 is demonstrated. In the power storage device 100 described above, when the internal pressure of the case 1 increases, the pressure acting on the lower surface of the second reversing plate 40 increases. On the other hand, the pressure of the space 120 sealed from the space in the case 1 acts on the upper surface of the second reversing plate 40. For this reason, if the pressure in case 1 exceeds a predetermined value, the 2nd inversion board 40 will reverse and it will change from the state of convex to the state of convex to the upper part. As a result, the second reversing plate 40 (specifically, the protrusion 43 of the second reversing plate 40) changes from the first position to the second position. When the 2nd inversion board 40 moves to a 2nd position, the protrusion part 43 of the 2nd inversion board 40 will collide with the center part 22 of the electricity supply board 20, and the electricity supply board 20 will fracture | rupture in the groove part 20a. Thereby, the 1st inversion board 30 inverts, and the center part 22 of the 1st inversion board 30 and the electricity supply board 20 displaces upwards. For this reason, the electricity supply path which connects the electricity supply board 20 and the 1st inversion board 30 is interrupted | blocked, and it will be in the non-conduction state by which the continuity between the electrode assembly 3 and the connection terminal 7 is interrupted | blocked. At this time, the first reversing plate 30 is insulated from the connection terminal 56 and the energization plate 20 is insulated from the connection terminal 7.

  A method for manufacturing the current interrupting device 10 according to the first embodiment will be described. In addition, the description is abbreviate | omitted about the part performed like the conventional method among the manufacturing methods of an electric current interruption apparatus, and only a different part from the conventional manufacturing method is demonstrated here. First, the external terminal 61, the gasket 63, and the bolt 65 are attached to the upper surface of the lid portion 112.

  Next, as shown in FIG. 5, the connection terminal 7 before caulking is inserted into the attachment hole 82 of the lid portion 112 and the through hole 79 a of the holder 80 from the lower side of the lid portion 112. As described above, the fixing portion 96 of the connection terminal 7 before caulking is not bent with respect to the cylindrical portion 94 (the fixing portion 96a before caulking is illustrated by a two-dot chain line in FIG. 5). For this reason, the connection terminal 7 can be inserted into the mounting hole 82 and the through hole 79a. The lid 112 is fixed on a jig (not shown) in a state where the connection terminal 7 before caulking is inserted into the mounting hole 82 and the through hole 79a. The pressing device is driven from the upper side to the lower side of the fixing portion 96 of the connection terminal 7 with respect to the lid portion 112 fixed to the jig. As a result, the fixing portion 96 of the connection terminal 7 is bent outward to push the connection terminal 7 in the radial direction. As a result, the fixing portion 96 of the connection terminal 7 abuts on the upper surface of the external terminal 61, and the connection terminal 7 is caulked and fixed to the lid portion 112. Thereby, the upper end 79 of the holder 80 is fixed. That is, the holder 80 is fixed to the lid portion 112 by the connection terminal 7 (FIG. 5). Note that the lower end 77 of the holder 80 is constituted by an insertion portion 76 and a heat caulking portion 75a before heat caulking.

  Next, as shown in FIG. 6, the lid 112 is turned upside down and fixed to a jig (not shown). The first inversion plate 30 is welded to the lower surface of the base portion 95 of the connection terminal 7 of the lid portion 112 fixed to the jig. As a welding method, for example, laser welding or arc welding can be used. Thereby, the base part 95 of the connection terminal 7 and the outer peripheral part 31 of the 1st inversion board 30 are fixed.

  Next, as shown in FIG. 7, the O-ring 72 is inserted into the recess 74 of the holder 80. Next, the liquid gasket 73 is injected into the recess 74 of the holder 80.

  Next, as shown in FIG. 8, the energizing plate 20 having the second reversal plate 40 welded to the lower surface thereof is attached to the holder 80. Specifically, the upper surface (abutment surface 20c) of the energizing plate 20 is brought into contact with the lower surface (mounting surface 78a) of the holder 80 so that the lower end 77 of the holder 80 is inserted into the through hole 20b of the energizing plate 20. Let Next, heat is applied to the heat caulking portion 75 of the holder 80 with a caulking tool. Thereby, the heat caulking part 75 is deformed following the shape of the caulking tool, and is in a state shown in FIG. Since the heat caulking portion 75 is larger than the through hole 20 b of the energization plate 20, the energization plate 20 does not come out of the holder 80. Note that the heat caulking with the caulking tool is performed before the predetermined time required for the liquid gasket 73 filled in the concave portion 74 of the holder 80 to dry.

  Next, after a predetermined time has elapsed (that is, after the liquid gasket 73 has dried), the current interrupting device 10 is turned upside down and the central portion 32 of the first reversing plate 30 is passed through the through hole 97 of the connection terminal 7. And the current interrupting device 10 is completed by welding the center part 22 of the electricity supply board 20 (state shown in FIG. 3). The reason why the liquid gasket 73 is left for a predetermined time in the state shown in FIG. 8 is that the liquid gasket 73 may leak from the concave portion 74 of the holder 80 when the current interrupting device 10 is turned upside down before the liquid gasket 73 dries. It is. By drying the liquid gasket 73, the adhesion between the mounting surface 78a of the holder 80 and the contact surface 20c of the energizing plate 20 is improved by the liquid gasket 73. For this reason, it is possible to improve the adhesion between the holder 80 and the energizing plate 20 only by heat caulking, compared to the case where the holder 80 and the energizing plate 20 are fixed. improves.

  The effect of the current interrupt device 10 of the first embodiment will be described. In the current interrupt device 10 of the first embodiment, moisture enters the space 124 of the holder 80 through the through hole 97 of the connection terminal 7. Moisture that has entered the space 124 passes through the base portion 95 of the connection terminal 7 and the welded portion of the outer peripheral portion 31 of the first reversing plate 30 and enters the space 122. Moisture that has entered the space 122 may pass between the mounting surface 78 a of the holder 80 and the contact surface 20 c of the energizing plate 20 and enter the internal space of the case 1. In the current interrupt device 10 according to the first embodiment, a recess 74 is formed in the mounting surface 78a. The recess 74 is filled with a liquid gasket 73 and accommodates an O-ring 72. The liquid gasket 73 and the O-ring 72 seal between the mounting surface 78a and the contact surface 20c. That is, the space 122 of the holder 80 and the internal space of the case 1 are blocked by the liquid gasket 73 and the O-ring 72. In general, the moisture permeability coefficient of the liquid gasket 73 is lower than the moisture permeability coefficient of the O-ring 72. For this reason, it is possible to suppress the moisture in the space 122 from entering the internal space of the case 1 as compared with the case where only the O-ring 72 is accommodated in the recess 74. Further, since the liquid gasket 73 is in a liquid state before being dried, it penetrates into the contact surface 20c facing the recess 74. For this reason, even when the surface roughness of the contact surface 20 c is large, the surface roughness of the contact surface 20 c can be relaxed, and moisture can be prevented from entering the internal space of the case 1.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  In the above embodiment, only one recess 74 is provided on the mounting surface 78 a of the holder 80. However, as shown in FIG. 9, the mounting surface 78a of the holder 80 is provided with a first recess 174a and a second recess 174b that is spaced radially outward from the first recess 174a. Also good. The first recess 174a is filled with a liquid gasket 73, and the O-ring 72 is accommodated in the second recess 174b. When the liquid gasket 73 and the O-ring 72 are provided in one recess 74, the size of the recess 74 cannot be made smaller than the size of the O-ring 72. On the other hand, when the liquid gasket 73 and the O-ring 72 are provided in different recesses, the size of the first recess 174a that fills the liquid gasket 73 can be arbitrarily defined.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

1: Case 3: Electrode assembly 5, 7: Connection terminal 10: Current interruption device 20: Current supply plate 20a: Groove 20b: Through hole 20c: Contact surface 30: First reversing plate 40: Second reversing plate 43: Projection Portion 51: Positive current collecting tab 52: Negative current collecting tab 53: Positive electrode lead 54: Negative electrode lead 56: Connection terminal 60, 61: External terminal 62, 63: Gasket 64, 65: Bolt 70, 71: Insulating member 72: O Ring 73: Liquid gasket 74, 174a, 174b: Concave portion 75: Heat caulking portion 76: Insertion portion 77: Lower end portion 78: Center portion 78a: Mounting surface 79: Upper end portion 79a: Through hole 80: Holder 81, 82: Mounting hole 97: Through hole 98: Recess 100: Power storage device 111: Main body 112: Lid

Claims (3)

An electrode assembly housed in a case;
A connection terminal provided in a mounting hole of the case, and having a through-hole communicating with the inside and outside of the case;
Switching between a conductive state housed in the case and electrically connected to the electrode assembly and the connection terminal and a non-conductive state in which the electrode assembly and the connection terminal are electrically disconnected. A current interruption device,
The current interrupt device is
An insulating holder attached to an end of the connection terminal inside the case and having an internal space communicating with the through hole of the connection terminal;
A current-carrying plate that electrically connects the electrode assembly and the connection terminal in the conductive state, and electrically disconnects the electrode assembly and the connection terminal in the non-conductive state. And
The energization plate is attached to the holder,
The inner space of the holder is sealed by contacting the mounting surface of the energizing plate in the holder and the abutting surface of the energizing plate with the holder,
A first recess is provided on one of the mounting surface of the holder and the contact surface of the energizing plate,
The space completely surrounded by the other mounting surface of the holder, the contact surface of the energizing plate, and the first recess is filled with an O-ring and a dried liquid gasket. And the space between the mounting surface of the holder and the contact surface of the energizing plate is sealed by the liquid gasket. The power storage device according to claim 1 , wherein the first recess is provided on a mounting surface of the holder. An electrode assembly housed in a case;
A connection terminal provided in the mounting hole of the case, and having a through-hole communicating with the inside and outside of the case;
Switching between a conductive state in which the electrode assembly and the connection terminal are electrically connected and a non-conductive state in which the electrode assembly and the connection terminal are electrically disconnected is accommodated in the case. A current interruption device,
The current interrupt device is
An insulating holder attached to an end of the connection terminal inside the case and having an internal space communicating with the through hole of the connection terminal;
A current-carrying plate that electrically connects the electrode assembly and the connection terminal in the conductive state, and electrically disconnects the electrode assembly and the connection terminal in the non-conductive state. And
The energization plate is attached to the holder,
The inner space of the holder is sealed by contacting the mounting surface of the energizing plate in the holder and the abutting surface of the energizing plate with the holder,
A first recess is provided on one of the mounting surface of the holder and the contact surface of the energizing plate,
A space completely surrounded by the other mounting surface of the holder, the other contact surface of the energizing plate, and the first recess is filled with a dried liquid gasket, and the liquid gasket allows the The space between the mounting surface of the holder and the contact surface of the energizing plate is sealed ,
The first recess is provided on a mounting surface of the holder,
The mounting surface of the holder further includes a second recess provided at an interval inside or outside the first recess,
A power storage device in which an O-ring is accommodated in the second recess .

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