JP6534600B2 - Method of manufacturing power storage device - Google Patents

Description

  The technology disclosed herein relates to a method of manufacturing a power storage device.

  Patent Document 1 discloses a power storage device provided with a current interrupting device for interrupting an electrical connection between an electrode terminal and an electrode assembly inside a case when the pressure in the case reaches a predetermined value. There is. In this power storage device, a through hole is provided in the electrode terminal, and the internal space of the current interrupting device communicates with the space on the outer side of the case by the through hole. Therefore, when the electrolytic solution or the washing water infiltrates into the through hole at the time of pouring or washing the electrolytic solution, the current interrupting device is corroded and its performance is deteriorated.

  In the power storage device of Patent Document 1, in order to solve the above problem, the through hole of the electrode terminal is sealed by a sealing plug made of an elastic member. For this reason, it is described that it becomes difficult to infiltrate electrolyte solution and cleaning water into the inside of a penetration hole, and having a bad influence on operation of a current interception device can be eliminated.

JP, 2014-63745, A

  In the power storage device described in Patent Document 1, the through hole of the electrode terminal is sealed by welding and fixing the metal plate provided in the sealing plug to the electrode terminal by laser welding. However, since this storage device is not manufactured by inspecting the sealing performance of the sealing plug, the reliability of the sealing performance of the sealing plug is low, and the inside of the current interrupting device is penetrated through the through hole. There is a possibility that water may permeate. The present specification discloses a technique capable of suitably preventing the entry of moisture into the current interrupting device by inspecting the sealability of a sealing plug when manufacturing a power storage device.

  In this specification, a method of manufacturing a power storage device is disclosed. The storage device includes a case, an electrode assembly housed in the case, an electrode terminal provided in the case and electrically connected to the electrode assembly, housed in the case, the electrode assembly and the electrode terminal And a current interrupting device for switching between a conductive state in which the electrode assembly is electrically connected and a non-conductive state in which the electrode assembly and the electrode terminal are electrically disconnected. The electrode terminal has a through hole communicating the space on the outer side of the case with the internal space of the current interrupting device. In the through hole, a sealing plug is disposed which seals the internal space of the current interrupting device from the space on the outer side of the case. According to a method of manufacturing a power storage device, a storage step of storing a first test gas for testing sealing performance of a sealing plug in an internal space of a current interrupting device, and a through hole in a state where the first test gas is sealed. And a detection step of detecting a leak of the first inspection gas outside the case.

  In the above manufacturing method, the through hole is sealed by the sealing plug in a state where the first inspection gas is introduced into the internal space of the current interrupting device. Therefore, the sealability of the sealing plug can be inspected based on whether or not the first inspection gas is detected outside the case. That is, in the detection step, when the first inspection gas is detected outside the case, it can be determined that the sealing of the sealing plug is insufficient. On the other hand, when the first inspection gas is not detected outside the case in the detection step, it can be determined that the sealing performance of the sealing plug is sufficient. According to this manufacturing method, the reliability of the sealing property of the sealing plug can be improved by inspecting the sealing property of the sealing plug at the time of manufacture, and the entry of moisture into the current interrupting device is suitably prevented. It is possible to manufacture a storage device that can be used.

FIG. 2 is a cross-sectional view of the power storage device of Example 1. The enlarged view of the broken line part 200a of FIG. FIG. 7 is a diagram showing the method of manufacturing the power storage device of Example 1 (storage step). FIG. 7 is a diagram showing the method of manufacturing the power storage device of Example 1 (the sealing step). FIG. 7 is a diagram showing the method of manufacturing the power storage device of the first embodiment (detection step). FIG. 13 is a diagram showing a method of manufacturing the power storage device of the second embodiment (current interrupting device inspection step). Sectional drawing which shows the example which deform | transformed the electrical storage apparatus of Example 1 (equivalent to the broken-line part 200a of FIG. 1).

  The main features of the embodiment described below are listed. The technical elements described below are technical elements that are independent of each other and exhibit technical usefulness by themselves or various combinations, and are not limited to the combinations described in the claims at the time of filing. Absent.

(Feature 1) In the method of manufacturing a power storage device disclosed in the present specification, the detection step may be performed in a state where the space on the outer side of the case is decompressed. According to this manufacturing method, it is possible to further improve the accuracy of detecting the leak of the first inspection gas due to the sealing failure of the sealing plug.

(Feature 2) In the method of manufacturing a power storage device disclosed in the present specification, the current interrupting device may include a seal portion that seals the internal space of the current interrupting device and the internal space of the case. In addition, before the storing step, a second inspection gas may be sealed in the inner space of the case to further include a current interruption device inspection step of inspecting the sealability of the seal portion of the current interruption device. According to this manufacturing method, the reliability of the operation of the current interrupting device can be increased because the sealability of the seal portion of the current interrupting device is inspected.

  Hereinafter, a method of manufacturing power storage device 100 disclosed in the present specification will be described with reference to the drawings. First, a power storage device 100 manufactured by the manufacturing method according to the present embodiment will be described. As shown in FIG. 1, the power storage device 100 includes a case 1, an electrode assembly 3 housed in the case 1, and terminals 5 and 7 as electrode terminals fixed to the case 1. The electrode assembly 3 and the terminals 5 and 7 are electrically connected. Power storage device 100 further includes a current interrupting device 10 disposed between electrode assembly 3 and terminal 7. The electrolytic solution is injected into the inside of the case 1, and the electrode assembly 3 is immersed in the electrolytic solution.

  The case 1 is made of metal and is a box-shaped member having a substantially rectangular parallelepiped shape. The case 1 includes a main body 111 and a lid 112 fixed to the main body 111. The lid 112 covers the top of the main body 111. Openings 81 and 82 are formed in the lid 112. The terminal 5 communicates with the inside and the outside of the case 1 through the opening 81, and the terminal 7 communicates with the inside and the outside of the case 1 through the opening 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 positive electrode sheets, a plurality of negative electrode sheets, and a plurality of separators. 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 also includes a positive electrode current collecting tab 41 and a negative electrode current collecting tab 42. The positive electrode current collection tab 41 is formed on the upper end portion of the positive electrode sheet. The negative electrode current collection tab 42 is formed on the upper end portion of the negative electrode sheet. The positive electrode current collecting tab 41 and the negative electrode current collecting tab 42 protrude above the electrode assembly 3. The positive electrode current collection tab 41 is fixed to the positive electrode lead 43. The negative electrode current collection tab 42 is fixed to the negative electrode lead 44.

  The positive electrode lead 43 is connected to the positive electrode current collecting tab 41 and the terminal 5. The positive electrode current collection tab 41 and the terminal 5 are electrically connected via the positive electrode lead 43. An insulating member 72 is disposed between the positive electrode lead 43 and the case 1. The insulating member 72 insulates the positive electrode lead 43 and the lid portion 112 of the case 1.

  The negative electrode lead 44 is connected to the negative electrode current collection tab 42 and the connection terminal 46. The connection terminal 46 is electrically connected to the terminal 7 via the current interrupting device 10. Thus, the negative electrode current collection tab 42 and the terminal 7 are electrically connected via the negative electrode lead 44, the connection terminal 46 and the current interrupting device 10. As a result, a conduction path connecting the electrode assembly 3 and the terminal 7 is formed. The current interrupting device 10 can interrupt this current path. The configuration of the current interrupting device 10 will be described later. An insulating member 73 is disposed between the negative electrode lead 44 and the case 1. The insulating member 73 insulates the negative electrode lead 44 from the case 1.

  Gaskets 62 and 63 made of resin are disposed on the upper surface of the lid 112. An external terminal 60 is disposed on the top surface of the gasket 62. A through hole 60 a is formed in the external terminal 60. The size of the lower surface side of the through hole 60 a is larger than that of the upper surface side of the external terminal 60. The gasket 62 insulates the lid 112 and the external terminal 60. The bolt 64 passes through the through hole 60a. Specifically, the head of the bolt 64 is accommodated in the through hole 60a. Further, the shaft portion of the bolt 64 protrudes above the external terminal 60 through the through hole 60 a. The terminal 5, the external terminal 60, and the bolt 64 are electrically connected to one another to constitute a positive electrode terminal. The configurations of the gasket 63, the external terminal 61 and the bolt 65 are the same as the configurations of the gasket 62, the external terminal 60 and the bolt 64 described above. The terminal 7, the external terminal 61, and the bolt 65 are electrically connected to one another to form a negative electrode terminal.

  Here, the terminal 7 will be described with reference to FIG. As shown in FIG. 2, the terminal 7 is fixed to the case 1 by caulking. The terminal 7 includes a cylindrical portion 94, a base portion 95 and a fixing portion 96. The cylindrical portion 94 is inserted into the opening 82. A through hole 97 is formed in the cylindrical portion 94. The base portion 95 is annularly formed. The base portion 95 is fixed to the lower end portion of the cylindrical portion 94. The base 95 is disposed inside the case 1. The recess 95 is formed in the base portion 95. The recess 98 communicates with the through hole 97. The base portion 95 is formed with a protrusion 99. The protrusion 99 is annularly formed along the outer peripheral edge of the lower surface of the base 95. The protruding portion 99 protrudes downward (from the lower surface of the current-carrying plate 20 described later) from the lower surface of the base portion 95. The fixing portion 96 is formed in an annular shape, and is disposed at the upper end portion of the cylindrical portion 94. The fixing portion 96 is disposed outside the case 1. The terminal 7 is fixed to the lid 112 of the case 1 by the fixing portion 96.

  A seal member 86 is disposed between the lid 112 of the case 1 and the terminal 7. The seal member 86 is annular, and goes round the cylindrical portion 94 of the terminal 7. The sealing member 86 is in contact with the lower surface of the lid portion 112 of the case 1 and the inner peripheral surface of the opening 82 and the base portion 95 and the cylindrical portion 94 of the terminal 7, thereby sealing the inside and outside of the case 1 There is. The seal member 86 is formed of a material having insulation and electrolyte resistance (perfluoroalkoxyalkane (PFA) in this embodiment). The lid 112 and the terminal 7 are insulated by the seal member 86. The material of the sealing member 86 is not limited to this, and may be, for example, polytetrafluoroethylene (PTFE), polypropylene (PP), or the like.

  In the through hole 97, an insulating sealing plug 90 is disposed. The sealing plug 90 is made of, for example, a resin material such as rubber. The sealing plug 90 has a shaft 90a and a head 90b. The shaft portion 90a and the head portion 90b are integrally configured. The shaft portion 90 a is inserted into the through hole 97. The head 90 b is disposed at the upper end of the shaft 90 a. The diameter of the head portion 90 b is larger than the diameter of the shaft portion 90 a and larger than the diameter of the through hole 97. The lower surface of the head portion 90 b (a portion protruding in the radial direction from the shaft portion 90 a) is in contact with the upper surface of the fixing portion 96. The diameter of the shaft portion 90 a is slightly larger than the diameter of the through hole 97 in the state before being disposed in the through hole 97. Therefore, when disposing the sealing plug 90 (shaft portion 90a) in the through hole 97, the sealing plug 90 is deformed so that the diameter of the shaft portion 90a is reduced. Therefore, a restoring force is generated in the shaft portion 90 a, and the outer peripheral surface of the shaft portion 90 a is pressed against the inner surface of the through hole 97. Thereby, the through hole 97 is sealed by the sealing plug 90 and is separated into the internal space 12 of the current interrupting device 10 and the space 16 on the outer side of the case 1. That is, the internal space 12 of the current interrupting device 10 is sealed from the space 16 on the outer side of the case 1 by the sealing plug 90. The sealing plug 90 may be in contact with the outer peripheral surface of the shaft 90a and the inner surface of the through hole 97 so that the space between the shaft 90a and the inner surface of the through hole 97 is airtightly sealed. The shape of 90b is not limited to the above.

  Next, the current interrupting device 10 will be described. As shown in FIG. 2, the current interrupting device 10 includes a current-carrying plate 20, a first deformation plate 30, and a holder 80. The first deformation plate 30 is a circular conductive diaphragm and is convex downward. The first deformation plate 30 has a central portion 32 and an outer peripheral portion 31. The central portion 32 of the first deformation plate 30 is connected to the conduction plate 20. The outer peripheral portion 31 of the first deformation plate 30 is connected to the outer peripheral portion of the lower surface of the base portion 95. In detail, the outer peripheral portion 31 of the first deformation plate 30 and the outer peripheral portion of the lower surface of the base portion 95 are fixed by spot welding at constant intervals in the circumferential direction. When the first deformation plate 30 is connected to the lower surface of the base portion 95, the outer peripheral surface of the first deformation plate 30 abuts on the inner wall surface of the holder 80. As a result, the connection position of the first deformation plate 30 with respect to the base portion 95 (i.e., the terminal 7) can be stabilized. The lower end of the recess 98 of the base 95 is covered by the first deformation plate 30.

  The conducting plate 20 is a metal member and has conductivity. The conduction plate 20 is formed in a circular shape in plan view, and is disposed below the first deformation plate 30. The connection terminal 46 is connected to the conduction plate 20. The energizing plate 20 has a central portion 22 and an outer peripheral portion 21. Grooves 20 a are formed on the lower surface of the current-carrying plate 20. The groove portion 20 a is formed around the central portion 22, and the current-carrying plate 20 and the central portion 32 of the first deformation plate 30 are connected inside the groove portion 20 a. The mechanical strength of the plate 20 at the position where the groove 20a is formed is lower than the mechanical strength of the plate 20 at a position other than the groove 20a.

  The holder 80 is formed in an annular shape, and accommodates and holds the base portion 95 of the terminal 7, the first deformation plate 30, and the seal member 75 therein. The conduction plate 20 is fixed to the lower end of the holder 80, and the conduction plate 20 is supported by the holder 80. The holder 80 is formed of an insulating material having elasticity. For example, polyphenyl sulfide (PPS) is used for the holder 80. The material of the holder 80 is not limited to the PPS described above, and may be a material (for example, polypropylene (PP) or the like) having insulating properties and electrolytic solution resistance and having higher compressive strength than the sealing member 86.

  The holder 80 has an upper end 79 and a central portion 78. The upper end 79 is disposed between the lid 112 of the case 1 and the base 95 of the terminal 7. The upper end 79 is in contact with the lower surface of the lid 112 and the upper surface of the base 95, and plays a role as a spacer that determines the distance between the lid 112 and the base 95. The lid 112 and the base 95 are insulated by the upper end 79.

  The central portion 78 extends downward from the outer peripheral edge of the upper end portion 79. That is, the central portion 78 is disposed between the lower surface of the lid portion 112 of the case 1 and the upper surface of the conductive plate 20. The central portion 78 is formed in an annular shape, and accommodates the base portion 95 and the first deformation plate 30 therein. On the inner surface of the central portion 78, an abutting portion that abuts on the outer peripheral surface of the base portion 95 and a recess 77 located below the abutting portion are formed. The abutting portion is formed on the upper end side of the central portion 78, and the recess 77 is formed on the lower end side of the central portion 78. The diameter of the recess 77 is larger than the diameter of the base portion 95 (diameter of the contact portion). Since the protrusion 99 is formed on the lower surface of the base 95, when the base 95 is accommodated in the central portion 78, a part of the protrusion 99 protrudes into the recess 77. By projecting the protrusion 99 into the recess 77, a space for accommodating the seal member 75 is formed in the recess 77. The lower surface of the central portion 78 is in contact with the upper surface of the current-carrying plate 20.

  The seal member 75 is accommodated in a space outside the protrusion 99 of the recess 77. The seal member 75 makes a round in the circumferential direction on the outer peripheral side of the base portion 95 of the terminal 7. The seal member 75 is accommodated in a compressed state in the above-mentioned space, and is in contact with the current-carrying plate 20, the holder 80 and the protrusion 99. The seal member 75 seals between the two at each contact portion. Thus, the space 14 in the case 1, the space 16 outside the case 1, and the internal space 12 of the current interrupting device 10 are sealed. The sealing member 75 is, for example, an O-ring made of ethylene-propylene rubber (EPM) such as ethylene-propylene-diene rubber (EPDM). The sealing member 75 is not limited to the above, and a material having sealing properties, insulating properties, electrolytic solution resistance, and elasticity may be used. The lower end of the projecting portion 99 formed on the lower surface of the base portion 95 is located below the upper end of the recess 77, but is not in contact with the conductive plate 20. When the seal member 75 abuts on the projecting portion 99, the seal member 75 is prevented from being displaced relative to the current-carrying plate 20 or the holder 80.

  The energizing plate 20 and the holder 80 are fixed by a fixing member 70. The fixing member 70 crimps and fixes the conduction plate 20 and the holder 80.

  Here, the shutoff operation of the current breaker 10 will be described. In the power storage device 100 described above, the terminal 5 and the terminal 7 are used in a conductive state in which current can be supplied via an external device (for example, a generator, a motor, etc.). When the pressure in case 1 is increased due to overcharging of power storage device 100 or the like, the pressure acting on the lower surface of conductive plate 20 is increased. On the other hand, the pressure acting on the upper surface of the first deformation plate 30 is substantially constant. For this reason, when the internal pressure of the case 1 rises and reaches a predetermined value, the current-carrying plate 20 connected to the central portion 32 of the first deformable plate 30 is broken starting from the mechanically fragile groove 20a. Then, the first deformation plate 30 is inverted and changes to a state of being convex upward. As a result, the conduction path connecting the conduction plate 20 and the first deformation plate 30 is cut off, and the electrode assembly 3 and the terminal 7 are brought out of conduction. At this time, the first deformation plate 30 is insulated from the connection terminal 46, and the conduction plate 20 is insulated from the terminal 7.

  Next, a method of manufacturing power storage device 100 will be described. Below, the detailed explanation is omitted about the same process as the conventional manufacturing method. First, each element 1, 3, 10, etc. constituting the power storage device 100 are prepared. Next, the terminals 5 and 7 are fixed to the lid 112, and the electrode assembly 3 is connected to the terminal 7 via the current interrupting device 10, and the electrode assembly 3 is connected to the terminal 5 Each component on the side 112 is subassembled. Next, the sub-assembled lid portion 112 is fixed to the main body 111 of the case 1, and thereafter, the steps described below are performed.

(Storage process)
In this step, as indicated by the arrows in FIG. 3, the first test gas G ₁ supplied to the interior space 12 of the current interruption device 10, it stores a first test gas G ₁ into the inner space 12. In this embodiment, as the first test gas G _1, the He is used. The first test gas G ₁ is supplied to the interior space 12 of the current interruption device 10 from the through-hole 97 is filled to the end of the inner space 12. Specifically, current interrupting is performed by arranging power storage device 100 (specifically, power storage device 100 in a state before sealing plug 90 is inserted) in a container filled with _first test gas G1. supplying a first test gas _{G 1} into the interior space 12 of the apparatus 10. The first test gas G ₁ is not limited to the above, such as rare gas or N _2, such as Ar may be a small gas inert and molecular size. Further, a method of introducing into the first test the internal space 12 of the gas G ₁ is not limited to the above, by utilizing the specific gravity difference between the first test gas G ₁ and the atmosphere, into the interior space 12 of the current interrupting device 10 You may introduce it.

(Sealing process)
Next, as shown in FIG. 4, the through hole 97 is sealed by a sealing plug 90. That is, the sealing plug 90 is inserted into the through hole 97. Insertion of the sealing plug 90 is performed in a state where storing the test gas G ₁ into the internal space 12 first current blocking device 10. Thereby, the internal space 12 of the current interrupting device 10 and the space 16 on the outer side of the case 1 are separated, and the internal space 12 of the current interrupting device 10 is sealed from the space 16 on the outer side of the case 1. Therefore, the first test gas G ₁ is enclosed in the internal space 12 of the current interruption device 10.

(Detection process)
Then, removed from the filled container in a power storage device 100 sealing plug 90 is plugged first test gas G _1, then housed in a container air is introduced, in case external, first It is detected whether the test gas G1 of ₁ has leaked. That is, test gas G ₁ of the first in a container containing the power storage device 100 whether or not detected, the monitor by a predetermined set time. When sealing the through hole 97 and sealing plug 90 is insufficient, as shown by the arrows in FIG. 5, the first test gas G ₁ is leaking from between the through hole 97 and sealing plug 90. Therefore, in the outside of the case 1, it is possible to detect the first test gas G _1. The detection of the first test gas G _1, may be a known measurement device (detector) D _1. If the first test gas G ₁ between the predetermined set time is detected, replace the seal of the through-hole 97 by the sealing plug 90 is insufficient, the sealing plug 90 with a new one And other measures are taken. When the sealing plug 90 is replaced with a new one, the storing step, the sealing step, and the detecting step are performed again. Meanwhile, during the set time determined if the first test gas G ₁ is not detected, it is determined that the sealing of the through-hole 97 by the sealing plug 90 is sufficient, the production of power storage device 100 is completed Do.

In the manufacturing method of the power storage device 100 of the present embodiment, the first test gas G ₁ is enclosed in the internal space 12 of the current interruption device 10, if the first leakage test gas G ₁ is occurring at the outside of the case 1 Check if it is not. That is, the sealability between the through hole 97 and the sealing plug 90 is inspected. Therefore, power storage device 100 in which a seal failure occurs between through hole 97 and sealing plug 90 can be detected, and the reliability of the sealing property of sealing plug 90 is high. Thus, it is possible to manufacture a power storage device 100 capable of preferably suppressing the entry of moisture.

In addition, the detection process mentioned above may be performed in the state which pressure-reduced the space 16 by the side of case 1 outer side. For example, while encapsulating the first test gas G ₁ into the inner space 12 of the current interruption device 10, placing the case 1 into the vacuum chamber, the vacuum chamber (i.e., the space 16 of the outer case 1) The detection step is performed with the pressure of According to such a method, when sealing the sealing plug 90 is insufficient, the first leak test gas G ₁ sealed in the interior space 12 of the current interrupting device 10 is facilitated. For this reason, the sealed state between the through hole 97 and the sealing plug 90 can be inspected more accurately.

  Next, with reference to FIG. 6, the manufacturing method of Example 2 is demonstrated. Hereinafter, only differences from the first embodiment will be described, and the detailed description of the same configuration as the first embodiment will be omitted.

(Current interrupting device inspection process)
In this embodiment, prior to the storing step, by encapsulating the second test gas G ₂ to the space 14 inside the case 1, between the space 14 of the interior space 12 and the casing 1 of the current interrupting device 10 It further comprises a current interruption device inspection step of inspecting the sealing performance (that is, the sealing performance of the sealing member 75).

This step may, for example, filled with test gas G ₂ a space 14 and the case 1 outside the space 16 from the electrolyte of the pour hole communicating (not shown) in the second casing 1 within casing 1, Case the second test gas G ₂ is performed by detecting whether the leakage in one of the external. In this embodiment, as the second test gas G _2, the He is used. Note that test gas G ₂ of the second is not limited to the above, like the first test gas G _1, such as rare gas or N _2, such as Ar may be a small gas inert and molecular size. In addition, the detection of the second test gas G _2, may be a known detector D _2.

In the current interrupting device inspection process, if the space 14 in the case 1 is not properly sealed from the internal space 12 of the current interrupting device 10, the second inspection gas G ₂ flows from the space 14 in the case 1 to the current interrupting device 10. Leak into the interior space 12 of the Test gas G ₂ of the second, for example, leak into the internal space 12 of the current interrupting device 10 through a path indicated by arrows in FIG. 6. Since this process is performed before the storage process, as shown in FIG. 6, the sealing plug 90 is not disposed in the through hole 97. Therefore, the second test gas G ₂ which has leaked into the internal space 12 of the current interrupting device 10 flows out through the through hole 97 for communicating the space 12 and the case 1 out of space 16 to the casing 1 outside the space 16. Therefore, in the outside of the case 1, the measuring device (detector) D ₂ can detect the second test gas G _2.

  In the present embodiment, since the seal inspection of the current interrupting device 10 can be performed, the reliability of the current interrupting device 10 can be improved. In addition, since the process described in the present embodiment is an independent process, the same function and effect as those of Embodiment 1 can be exhibited by the process of inspecting the sealing property of the sealing plug performed after the process.

  The correspondence of each component of an example and a claim is explained. The seal member 75 of the embodiment is an example of the seal portion in the claims.

  Although the embodiments of the technology disclosed in the present specification have been described above in detail, these are merely examples, and do not limit the scope of the claims. The art set forth in the claims includes various variations and modifications of the specific examples illustrated above.

  For example, as shown in FIG. 7, the current interrupting device may further include a second deformation plate 40. The second deformation plate 40 has a central portion 47 and an outer peripheral portion 48. The second deformation plate 40 is disposed below the conduction plate 20, and a central portion 47 of the second deformation plate 40 protrudes downward. The upper surface of the outer peripheral portion 48 of the second deformation plate 40 and the lower surface of the outer peripheral portion 21 of the current-carrying plate 20 are fixed by welding. Further, at the center of the upper surface of the second deformation plate 40, a protruding portion 40a which protrudes upward is provided. The central portion 22 of the conducting plate 20 is located above the projecting portion 40 a. The inner pressure of the case 1 acts on the lower surface of the second deformation plate 40.

  The conduction plate 20 is disposed between the second deformation plate 40 and the first deformation plate 30, and the conduction plate 20 is formed with a vent hole 20 b. A space 18 between the second deformation plate 40 and the conduction plate 20 is in communication with a space 19 between the first deformation plate 30 and the conduction plate 20 via the vent hole 20 b. The first deformation plate 30 is disposed above the conduction plate 20.

  The interruption | blocking operation | movement of said electric current interruption apparatus is demonstrated. In the power storage device provided with this current interrupting device, when the internal pressure of the case 1 rises, the pressure acting on the lower surface of the second deformation plate 40 rises. On the other hand, the pressure of the space 18 sealed from the space in the case 1 acts on the upper surface of the second deformation plate 40. For this reason, when the pressure in the case 1 exceeds a predetermined value, the second deformation plate 40 is inverted, and the state of being convex downward changes to the state of being convex upward. At this time, the air in the space 18 moves to the space 19 through the vent holes 20 b, and the pressure in the space 19 rises. In addition, when the second deformation plate 40 changes from a downward convex state to a upward convex state, the protruding portion 40 a of the second deformation plate 40 moves and collides with the central portion 22 of the energizing plate 20, and the energizing plate 20 Is broken at the groove 20a. As a result, the first deformation plate 30 is reversed, and the first deformation plate 30 and the central portion 22 of the conduction plate 20 are displaced upward. As a result, the conduction path connecting the conduction plate 20 and the first deformation plate 30 is cut off, and the conduction between the electrode assembly 3 and the terminal 7 is cut off. At this time, the first deformation plate 30 is insulated from the connection terminal 46, and the conduction plate 20 is insulated from the terminal 7.

  The manufacturing methods of the first embodiment and the second embodiment can be used also in the power storage device provided with the above current interrupting device, and the same operation and effect as those of the respective embodiments can be exhibited.

  Further, in the method of manufacturing a power storage device according to the present invention, the current interrupting device may be provided on the terminal 5 side, or may be provided on both the terminal 5 and the terminal 7. When the current interrupting device is provided on the terminal 5 side, an insulating member can be disposed between the terminal 5 and the lid 112 in the same manner as the configuration of the above embodiment. Further, in the above embodiment, the first deformation plate 30 is reversed to cut off the conduction with the conduction plate 20. However, the mode of deformation of the first deformation plate 30 is not limited to inversion. For example, when the central portion 32 of the first deformation plate 30 is bent upward, the conduction plate 20 is broken starting from the groove 20a, and the conduction between the first deformation plate 30 and the conduction plate 20 is interrupted. It is also good. The first deformation plate 30 may be deformed in any way as long as the conduction between the first deformation plate 30 and the conduction plate 20 is interrupted. The same applies to the second deformation plate 40.

  The technical elements described in the present specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the techniques illustrated in the present specification or the drawings simultaneously achieve a plurality of purposes, and achieving one of the purposes itself has technical utility.

1: Case 3: Electrode assembly 5, 7: Terminal 10: Current interrupting device 20: Conduction plate 20a: Groove 30: First deformation plate 41: Positive electrode current collecting tab 42: Negative electrode current collecting tab 43: Positive electrode lead 44: Negative electrode Lead 46: Connection terminal 60, 61: External terminal 62, 63: Gasket 64, 65: Bolt 75: Sealing member 80: Holder 86: Sealing member 90: Sealing plug 90a: Shaft 90b: Head 97: Through hole 100 : Storage device

Claims (2)

With the case,
An electrode assembly housed in the case;
An electrode terminal provided in the case and electrically connected to the electrode assembly;
Switched between a conductive state in which the electrode assembly and the electrode terminal are electrically connected and a non-conductive state in which the electrode assembly and the electrode terminal are not electrically connected. And a current interrupting device,
The electrode terminal has a through hole communicating the space on the outer side of the case with the internal space of the current interrupting device,
In the method of manufacturing a power storage device, a sealing plug for sealing the internal space of the current interrupting device from the space on the outer side of the case is disposed in the through hole.
A storage step of storing a first test gas for testing the sealing performance of the sealing plug in an internal space of the current interrupting device;
A sealing step of sealing the through hole with the sealing plug in a state in which the first inspection gas is stored;
Detecting the leak of the first inspection gas outside the case;
Only including,
The method of manufacturing a power storage device, wherein the detection step is performed in a state where a space on the outer side of the case is decompressed . The current interrupting device includes a seal portion that seals the internal space of the current interrupting device and the internal space of the case,
Wherein prior to the storing step, by encapsulating the second test gas in the internal space of the case, further comprises a current interrupting device inspection process for inspecting the sealing property of the sealing portion of the current blocking device, according to claim 1 method for manufacturing a power storage device according to.

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