JP5786808B2 - Power storage device provided with current interrupt device and power storage device module provided with a plurality thereof - Google Patents

Description

  The present invention relates to a power storage device including a current interrupt device and a power storage device module including a plurality of the power storage devices.

  In order to obtain a high output, when using a power storage unit in which a plurality of power storage devices are connected in series, the positive electrode terminal and the negative electrode terminal of each power storage device of the power storage unit are used to monitor the voltage and the like. May be connected. When the power storage device is equipped with a current interrupt device that interrupts the energization path during overcharge, etc., when the current interrupt device is activated, the connection between the electrode and the electrode terminal is interrupted on the side where the current interrupt device is installed. The current of the power storage units connected in series is cut off. As a result, a high voltage similar to the output voltage of the power storage unit is applied to the voltage monitoring unit, and the voltage monitoring unit may be destroyed.

  In Patent Document 1, an assembled battery including a plurality of storage batteries connected in series, a current cutoff switch connected in series between adjacent storage batteries, and an electrode terminal of each storage battery are connected via a semiconductor switch. A circuit including a monitoring circuit is described. When the series circuit of the battery pack is cut off by the current cut-off switch, a high voltage is applied between the wirings on both sides of the current cut-off switch. Since the plurality of semiconductor switches are turned off, it is possible to prevent a high voltage from being applied to the monitoring circuit.

JP 2008-151682 A

  Since Patent Document 1 includes almost the same number of semiconductor switches as the storage batteries included in the assembled battery, the circuit on the voltage monitoring unit side is complicated. In this application, without complicating the circuit of the voltage monitoring unit, a high voltage is applied to the voltage monitoring unit during operation of the current interrupting device even if it is connected in series to form a power storage unit and further connected to the voltage monitoring unit. Provided are a power storage device capable of preventing the power storage device and a power storage device module including a plurality of the power storage devices.

  A power storage device disclosed in this specification includes a case, an electrode assembly that is housed in the case and includes a first electrode having a first polarity and a second electrode having a second polarity, and a first electrode of the electrode assembly. A first electrode terminal for transferring electricity between the second electrode terminal for transferring electricity between the second electrode of the electrode assembly, and a first conductive member housed in the case and connected to the first electrode A second conductive member accommodated in the case and connected to the first electrode terminal; a third conductive member accommodated in the case and connected to the second electrode and the second electrode terminal; and accommodated in the case A current interrupting device that is connected in series with the first conductive member and the second conductive member to connect or cut off the energization path from the electrode assembly to the electrode terminal, and the first voltage terminal and the second insulated from the case And a voltage terminal. The power storage device includes a first connection portion that is a connection portion between the first electrode and the first conductive member, a second connection portion that is a connection portion between the first conductive member and the current interrupt device, a second electrode, and a third electrode. It has the 3rd connection part which is a connection part with a conductive member, and the 4th connection part which is a connection part of the 2nd electrode terminal and the 3rd conductive member. The first voltage terminal can be connected to the voltage monitoring unit and is connected to the first connection part, the second connection part, or between the first connection part and the second connection part. The second voltage terminal can be connected to the voltage monitoring unit, and is connected to the third connection part, the fourth connection part, between the third connection part and the fourth connection part, or to the second electrode terminal. Is done.

  In the above power storage device, on the first electrode (positive electrode or negative electrode) side where the current interrupt device is installed, the first voltage terminal connected to the voltage monitoring unit is closer to the first electrode than the current interrupt device, The first connection unit, the second connection unit, or between the first connection unit and the second connection unit is connected. When this power storage device is connected in series and used as a power storage unit, the electrical connection between the first voltage terminal and the first electrode is maintained even when the current interrupt device is activated and the current of the power storage device is interrupted. A high voltage is not applied to the voltage monitoring unit. According to the power storage device described above, it is not necessary to complicate the circuit of the voltage monitoring unit, and only by connecting the input on the side of measuring the voltage of the first electrode of the voltage monitoring unit to the first voltage terminal, the current interrupting device It is possible to prevent a high voltage from being applied to the voltage monitoring unit during the operation of.

  In the above power storage device, at least one of the first voltage terminal and the first conductive member is provided with a protrusion extending from the first conductive member toward the case, and the first voltage terminal is connected to the first voltage via the protrusion. The conductive member may be connected.

  In the above power storage device, the second voltage terminal is connected to the second electrode terminal outside the case, and may be provided outside the case. The second voltage terminal may be connected to the third conductive member.

  The power storage device may be a secondary battery.

  The present specification also provides a power storage device module including a power storage unit including a plurality of the power storage devices described above and a voltage monitoring unit. In this power storage device module, a plurality of power storage devices are connected in series to each of the first electrode terminal and the second electrode terminal of each of the plurality of power storage devices. The first voltage terminal and the second voltage terminal of each of the plurality of power storage devices are connected to the voltage monitoring unit.

  According to the present invention, a power storage device capable of preventing a high voltage from being applied to the voltage monitoring unit during operation of the current interrupting device even when connected in series to form a power storage unit and further connected to a voltage monitoring unit. And the electrical storage apparatus module provided with two or more of this electrical storage apparatus is provided.

1 is a longitudinal sectional view of a power storage device according to Embodiment 1. FIG. It is a figure which expands and shows the vicinity of the electric current interruption apparatus of the electrical storage apparatus of FIG. 1, and has shown the state at the time of electricity supply. It is a figure which expands and shows the vicinity of the electric current interruption apparatus of the electrical storage apparatus of FIG. 1, and has shown the state at the time of electric current interruption. It is a figure explaining fitting with the 1st voltage terminal, a gasket, and a case. 1 is a circuit diagram illustrating a power storage device module according to Embodiment 1. FIG. It is a figure which shows the 1st voltage terminal which concerns on a modification. It is a figure which shows the 1st voltage terminal which concerns on a modification. It is a circuit diagram which shows the conventional electrical storage apparatus module.

  The power storage device disclosed in this specification can be used as a conventionally known power storage device such as a sealed secondary battery or a sealed capacitor. Furthermore, specific examples of the secondary battery include secondary batteries such as lithium ion batteries, nickel metal hydride batteries, nickel cadmium batteries, and lead storage batteries that are charged and discharged with a relatively high capacity and a large current. The power storage device may be mounted on a vehicle, an electric device, or the like. The power storage device according to the present specification can be suitably used for applications in which a plurality of power storage devices are connected in series and connected to a load such as a vehicle.

  A power storage device disclosed in the present specification includes a case, an electrode assembly, a first electrode terminal and a second electrode terminal that transfer electricity between the electrode assembly, a first conductive member, and a second conductive member. And a third conductive member, a current interrupting device, a first voltage terminal, and a second voltage terminal. The electrode assembly, the first conductive member, the second conductive member, the third conductive member, and the current interrupt device are accommodated in the case.

  Here, the first polarity is either the positive electrode or the negative electrode, and the second polarity is the other. A current interrupt device is installed in the energization path on the first polarity side. The first electrode terminal transfers electricity to and from the first electrode of the electrode assembly, and the second electrode terminal transfers electricity to and from the second electrode. When the current interruption device is installed in the positive electrode energization path, the first polarity is the positive electrode, the second polarity is the negative electrode, the first electrode terminal is the positive electrode terminal, and the second electrode terminal is the negative electrode. Terminal. Conversely, when a current interrupt device is installed in the negative electrode energization path, the first polarity is a negative electrode, the second polarity is a positive electrode, the first electrode terminal is a negative electrode terminal, and the second electrode terminal Is a positive electrode terminal.

  Examples of the electrode assembly include an electrode assembly including a sheet-like positive electrode and a sheet-like negative electrode having a pair of electrodes in a state where a sheet-like separator is sandwiched between them. Specifically, a laminated electrode assembly in which a large number of electrode pairs are laminated and a wound electrode assembly in which the electrode pairs are wound around a predetermined axis can be exemplified. The electrode assembly may be immersed in the electrolyte.

  The first conductive member is connected to the first electrode and the current interrupt device. The second conductive member is connected to the first electrode terminal and the current interrupt device. The current interruption device is connected in series with the first conductive member and the second conductive member. The first electrode and the first conductive member are connected to each other at the first connection portion, and the first conductive member and the current interrupting device are connected to each other at the second connection portion.

  The third conductive member is connected to the second electrode and the second electrode terminal. The second electrode and the third conductive member are connected to each other at the third connection portion, and the second electrode terminal and the third conductive member are connected to each other at the fourth connection portion.

  The first voltage terminal and the second voltage terminal can be connected to the voltage monitoring unit and are insulated from the case. The first voltage terminal is connected to the first connection part, the second connection part, or between the first connection part and the second connection part. More specifically, the first voltage terminal may be connected to the first electrode or the first conductive member at the first connection portion, or may be connected to the first conductive member at the second connection portion, You may be connected to the 1st conductive member between the 1st connection part and the 2nd connection part. Thus, the first voltage terminal is connected so that the potential of the first electrode can be measured regardless of the state of the current interrupting device (energized state or interrupted state).

  At least one of the first voltage terminal and the first conductive member is provided with a protrusion extending from the first conductive member toward the case, and the first voltage terminal is connected to the first conductive member via the protrusion. Also good. For example, the first voltage terminal penetrates the case, protrudes outside the case so that it can be connected to the input terminal of the voltage monitoring unit, and can be connected and fixed to the first conductive member inside the case. In this case, it can be said that the first voltage terminal is provided with a protruding portion. Alternatively, the protrusion formed integrally with the first conductive member extends toward the case, protrudes outside the case through the case, and the outer portion of the case functions as the first voltage terminal. In this case, it can be said that the protrusion is provided over both the first voltage terminal and the first conductive member. The protrusion may be formed integrally with the first conductive member, or may be a separate member from the first conductive member, and may be fixed to the first conductive member by welding or the like. The first conductive member and the case can be easily positioned by inserting and fixing the protruding portion into the through hole of the case. Note that in the power storage device disclosed in this specification, the first voltage terminal and the first conductive member may be formed as separate members and connected to each other by wiring or the like.

  The second voltage terminal is connected to the third connection portion, the fourth connection portion, between the third connection portion and the fourth connection portion, or to the second electrode terminal. More specifically, the second voltage terminal may be connected to the second electrode or the third conductive member at the third connection portion, and is connected to the third conductive member or the second electrode terminal at the fourth connection portion. It may be connected to the third conductive member between the third connection portion and the fourth connection portion, or may be connected to the second electrode terminal at a place other than the fourth connection portion. In this way, the second voltage terminal is connected so that the potential of the second electrode can be measured. When the second voltage terminal is connected to the second electrode terminal and the power storage device has the second voltage terminal outside the case, there is no need to add a new component in the case as the second voltage terminal. Since it is only necessary to use a generally used wiring member as the second voltage terminal and connect it to the second electrode terminal, it is advantageous in terms of low cost. Further, when the second voltage terminal is connected to the third conductive member, the parts are shared between the first voltage terminal and the second voltage terminal, and between the first conductive member and the third conductive member. This is advantageous in that it can be designed as such.

  The above power storage device can be suitably used as a power storage unit in which a plurality of the power storage devices are connected in series. In the power storage device module including the power storage unit and the voltage monitoring unit, the plurality of power storage devices are connected in series to each other at the first electrode terminal and the second electrode terminal of the plurality of power storage devices. The first voltage terminal and the second voltage terminal of the plurality of power storage devices are connected to the voltage monitoring unit.

  FIG. 1 is a cross-sectional view of the power storage device 100 according to the first embodiment. The power storage device 100 includes a case 4, a stacked electrode assembly 2, tabs 26 and 46, first and second conductive members 45 and 44, which are positive electrode conductive members, and a negative electrode conductive member. Three conductive members 24, a positive electrode terminal 30, a negative electrode terminal 10, a first voltage terminal 70, a second voltage terminal 82, insulating gaskets 22 and 42, and a current interrupt device 50 are provided. . The electrode assembly 2 includes a sheet-like positive electrode, a negative electrode, and a separator. The positive electrode includes a positive electrode active material layer and a positive electrode metal foil. The negative electrode includes a negative electrode active material layer and a negative electrode metal foil. The separator is sandwiched between the positive electrode and the negative electrode to separate each other. The electrode assembly 2 is a laminate in which a large number of positive electrodes, separators, and negative electrodes are laminated in this order, and is impregnated with a liquid electrolyte.

  Case 4 is a substantially rectangular parallelepiped box-shaped member, and includes an electrode assembly 2 (including tabs 26 and 46), a first conductive member 45, a second conductive member 44, a third conductive member 24, and the like. The gaskets 22 and 42 and the current interrupt device 50 are accommodated. A positive electrode terminal 30, a negative electrode terminal 10, and a first voltage terminal 70 are provided on the upper end surface of the case 4. The second voltage terminal 82 is disposed outside the case 4. Tabs 46 protruding from one end of the plurality of positive electrode metal foils of the electrode assembly 2 are bundled, and similarly, tabs 26 protruding from one end of the plurality of negative electrode metal foils are bundled. The electrode assembly 2 is covered with an insulating film, and protrudes from the insulating film at tabs 46 and 26.

  The negative electrode terminal 10 includes a bolt 14, an inner nut 12, and an outer nut 16. A through hole is formed in the upper end surface of the case 4 at a position where the negative electrode terminal 10 is disposed, and a gasket 22 is attached to the through hole. The inner nut 12 passes through a through hole formed in the third conductive member 24 and is attached to the gasket 22. The bolt 14 is fastened to the inner nut 12 via a seal washer. The third conductive member 24 is sandwiched between the inner nut 12 and the gasket 22. That is, the third conductive member 24 and the inner nut 12 are in contact with each other at the fourth connection portion 24b and are electrically connected. The gasket 22 includes an extending portion that extends in a flat plate shape toward the tab 26 while contacting the upper end surface of the case 4. The upper surface of the third conductive member 24 is in contact with the lower surface of the extending portion of the gasket 22. The outer nut 16 of the negative electrode terminal 10 is used for connecting the negative electrode terminal 10 and the wiring member. The second voltage terminal 82 is a crimp terminal and is fixed to the negative electrode terminal 10 by the outer nut 16.

  The positive electrode terminal 30 includes a bolt 34, an inner nut 32, and an outer nut 36. At the position where the positive electrode terminal 30 is arranged, a through hole is formed in the upper end surface of the case 4, and a gasket 42 is attached to the through hole. The inner nut 32 passes through a through hole formed in the second conductive member 44 and is attached to the gasket 42. The bolt 34 is fastened to the inner nut 32 via a seal washer. The second conductive member 44 is sandwiched between the inner nut 32 and the gasket 42. The gasket 42 includes an extending portion that extends toward the tab 46 in a flat plate shape while contacting the upper end surface of the case 4. The upper surface of the flat portion on the tab 46 side of the first conductive member 45 is in contact with the lower surface of the extending portion of the gasket 42. The outer nut 36 of the positive electrode terminal 30 is used for connecting the positive electrode terminal 30 and the wiring member. The power storage device 100 can exchange electricity between the electrode assembly 2 and the outside of the case 4 through the positive electrode terminal 30 and the negative electrode terminal 10.

  The tabs 26, 46 extend from the electrode assembly 2 toward the upper end surface of the case 4, bent in the middle toward the front side of the paper surface of FIG. 1, and have a flat portion substantially parallel to the upper end surface of the case 4. Is formed.

  As shown in FIG. 1, the third conductive member 24 is a flat conductive member. The third conductive member 24 extends substantially parallel to the upper end surface of the case 4. The third conductive member 24 and the tab 26 are fixed by welding at the third connection portion 24a. Thus, the negative electrode energization path from the negative electrode to the negative electrode terminal 10 of the electrode assembly 2 is electrically connected by the tab 26 and the third conductive member 24 connected in series in this order. A gasket 22 is provided between the third conductive member 24 and the upper end surface of the case 4, whereby the third conductive member 24 and the case 4 are insulated.

  As shown in FIG. 1, the first conductive member 45 extends substantially parallel to the upper end surface of the case 4 from the tab 46 toward the current interrupt device 50, and then curves downward from the case 4 to interrupt the current. Below the device 50, it again extends substantially parallel to the upper end surface of the case 4. The first conductive member 45 and the tab 46 are fixed by welding at the first connection portion 45a. The current interrupt device 50 is in contact with the first conductive member 45 on the lower surface side and is in contact with the second conductive member 44 on the upper surface side. That is, the current interrupt device 50 has a joint portion joined to the first conductive member 45, and this joint portion is the second connection portion 45b.

  The second conductive member 44 is a flat plate-like conductive member, and extends substantially parallel to the upper end surface of the case 4. The positive electrode terminal 30 and the current interrupt device 50 are electrically connected via the first conductive member 44. Thus, the positive electrode energization path from the positive electrode of the electrode assembly 2 to the positive electrode terminal 30 has a tab 46, a first conductive member 45, a current interrupting device 50, and a second conductive material connected in series in this order. The member 44 is electrically connected. A gasket 42 is provided between the first conductive member 45 and the upper end surface of the case 4, so that the first conductive member 45 and the second conductive member 44 are insulated from the case 4.

  As shown in FIG. 2, the current interrupt device 50 includes a metal diaphragm 56 and a support member 52. The diaphragm 56 is flat at the central portion 56a and both end portions 56b and 56c, and extends obliquely upward while being partially curved from the central portion 56a toward both end portions 56b and 56c. The diaphragm 56 is joined to the second conductive member 44 at both end portions 56b and 56c, and is joined to the first conductive member 45 at the central portion 56a. The central portion 56a of the diaphragm 56 and the first conductive member 45 are fixed by welding at a second connection portion 45b that is joined to each other. The support member 52 supports the diaphragm 56 and the first conductive member 45. An insulating support member 52 exists between both end portions 56 b and 56 c of the diaphragm 56 and the first conductive member 45. The first conductive member 45 is formed with a marking portion 55 in the vicinity of the second connection portion 45b. In the engraved portion 55, the thickness of the first conductive member 45 is thin.

  When the pressure in the case 4 is lower than a predetermined value, the central portion 56a of the diaphragm 56 protrudes in the direction of the first conductive member 45 as shown in FIG. The first conductive member 45 and the second conductive member 44 are electrically connected via a diaphragm 56, and the positive electrode energization path between the positive electrode terminal 30 and the positive electrode of the electrode assembly 2 is connected.

  When the pressure in the case 4 rises to a predetermined value or more, as shown in FIG. 3, the marking portion 55 is broken, the diaphragm 56 is deformed, the central portion 56 a is inverted, and protrudes in a direction away from the first conductive member 45. To do. As a result, the diaphragm 56 and the first conductive member 45 become non-conductive, the first conductive member 45 and the second conductive member 44 become non-conductive, and the positive electrode energization path between the positive electrode terminal 30 and the positive electrode of the electrode assembly 2. Is cut off.

  The first voltage terminal 70 includes a protrusion 72 and a nut 76. As shown in FIGS. 1 and 4, the protrusion 72 is formed integrally with the first conductive member 45, and the lower end 72 a of the protrusion 72 is fixed to the upper surface of the first conductive member 45. That is, the projecting portion 72 is provided from the first voltage terminal 70 to the first conductive member 45, and the first voltage terminal 70 is connected between the first connection portion 45a and the second connection portion 45b. ing. At the position where the first voltage terminal 70 is disposed, through holes 4a and 42a are formed in the upper end surface of the case 4 and the gasket 42, respectively, and the through holes 4a and 42a are directed from the inside of the case 4 to the outside. The protrusion 72 is inserted. A thread groove is formed on the outer surface of the protruding portion 72, and the nut 76 can be fastened. As a result, the first voltage terminal 70 and the first conductive member 45 are fixed to the case 4 and the gasket 42. The wiring member 80 for connecting the first voltage terminal 70 to the voltage monitoring unit is connected to the outside of the case 4 by the nut 76 of the first voltage terminal 70. That is, the first voltage terminal 70 can be connected to the voltage monitoring unit. A wiring member for connecting the second voltage terminal 82 to the voltage monitoring unit is connected to the outside of the case 4 by the outer nut 16 of the negative electrode terminal 10. That is, the second voltage terminal 82 can be connected to the voltage monitoring unit.

  FIG. 5 is a circuit diagram of the power storage device module 200 according to the first embodiment. The power storage device module 200 includes a voltage monitoring unit 210, a power storage unit 220, and a power load 230.

  The power storage unit 220 includes a plurality of power storage devices 100 connected in series. The negative electrode terminal 10 of each power storage device 100 (excluding one power storage device arranged on the lowest potential side) is connected to the positive electrode terminal 30 of the adjacent power storage device 100 with a relatively high current capacity such as a bus bar. Connected by members. Among the plurality of power storage devices 100, the positive electrode terminal 30 of the power storage device 100 disposed on the highest potential side and the negative electrode terminal 10 of the power storage device 100 disposed on the lowest potential side include a power load 230 such as a vehicle. It is connected to the. A wiring member such as a bus bar is fixed to the positive electrode terminal 30 and the negative electrode terminal 10 by the outer nuts 36 and 16.

  The voltage monitoring unit 210 includes an analog / digital conversion unit (A / D conversion unit) 211 and a multiplexer (MUX) 212.

  In each power storage device 100, the first voltage terminal 70 for detecting the positive voltage is connected between the current interrupt device (CID) 50 and the positive electrode, and the second voltage terminal 70 detects the negative voltage. The voltage terminal 82 is connected to the negative electrode terminal 10. Since the current value flowing through the first voltage terminal 70 and the second voltage terminal 82 is 1/1000 or less of the current value flowing through the positive electrode terminal 30 and the negative electrode terminal 10, the first voltage terminal 70 and the second voltage terminal As the terminal 82 or a wiring member connected thereto, a wiring member having a relatively small current capacity such as a crimp terminal can be used.

  The MUX 212 is connected to the first voltage terminal 70 and the second voltage terminal 82 (connected to the negative electrode terminal 10) of the plurality of power storage devices 100, and the first voltage terminal 70 and the second voltage terminal 82 of the plurality of power storage devices 100 are connected. The input signal from the two voltage terminal 82 is processed, and one output signal is output to the analog / digital conversion unit (A / D conversion unit) 211. The A / D converter 211 converts an input analog signal into a digital signal, and outputs an output signal 213 to a display device (not shown) or the like.

  For comparison, a circuit diagram of a conventional power storage device module 800 is shown in FIG. The power storage device module 800 includes a voltage monitoring unit 810, a power storage unit 820, and a power load 230. The power storage unit 820 includes a plurality of power storage devices 700 connected in series. The A / D conversion unit 811 and the MUX 812 are the same as the A / D conversion unit 211 and the MUX 212. The A / D conversion unit 811 converts an analog signal input from the MUX 812 into a digital signal and outputs an output signal 813. To do.

  The conventional power storage device 700 does not include the first voltage terminal 70. For this reason, the input on the positive electrode side of the voltage monitoring unit 810 is connected to the positive electrode terminal 30. In each power storage device 700, a voltage terminal for detecting the positive voltage is connected to the positive electrode via a current interrupt device (CID).

  For this reason, when the current interrupting device 50 included in any of the plurality of power storage devices 700 is activated to interrupt the positive electrode energization path, a high voltage substantially equal to the output voltage of the entire power storage unit 820 is applied. That is, a high voltage is applied to the voltage monitoring unit 810, causing the voltage monitoring unit 810 to be destroyed.

  As described above, in the power storage device 100, the first voltage terminal 70 connected to the voltage monitoring unit 210 on the side of the first electrode (positive electrode) where the current interrupt device 50 is installed is first than the current interrupt device 50. It is connected to the first conductive member 45 that is closer to the electrode. Therefore, in the power storage device module 200 including the power storage unit 220 in which the power storage devices 100 are connected in series and the voltage monitoring unit 210, even if the current interrupting device 50 is activated and the current flowing through the power storage unit 220 is interrupted, The connection between the first voltage terminal 70 and the positive electrode is maintained, and a high voltage is not applied to the voltage monitoring unit 210. When the power storage unit 220 configured using the power storage device 100 is used, the voltage monitoring unit can be prevented from being destroyed when the current interrupting device 50 is operated without changing the structure of the voltage monitoring unit. That is, if each power storage device of the power storage unit 820 of the conventional power storage device module 800 is replaced with the power storage device 100, the connection of the input terminal of the voltage monitoring unit 810 is changed, and the device is used as it is without adding or remodeling. Thus, it is possible to obtain the power storage device module 200 in which the voltage monitoring unit is not destroyed when the current interrupt device 50 is operated.

  Further, in the power storage device 100, even if the current interrupt device 50 is activated, the electrical connection between the first voltage terminal 70 and the positive electrode is maintained, so the first voltage terminal 70 and the negative electrode terminal 10 are used. The electrode assembly 2 can be discharged.

  Further, in the power storage device 100, since the protruding portion 72 of the first voltage terminal 70 is formed integrally with the first conductive member 45, the first conductive member is fixed by fixing the protruding portion 72 to the case 4. 45 and the case 4 can be positioned easily.

  Further, in the power storage device 100, since a commonly used wiring member is used as the second voltage terminal 82 and is connected to the negative electrode terminal 10 outside the case 4, it is advantageous in terms of low cost.

(Modification)
As shown in FIG. 6, in the first voltage terminal 70, the protruding portion 372 may be a separate member from the first conductive member 345. The protruding portion 372 is a bolt-shaped member provided with a head portion 372 a and may be fixed to the first conductive member 345 by a through hole provided in the first conductive member 345. Further, the protruding portion 372 and the first conductive member 345 may be fixed by welding, bonding or the like in a state where the protruding portion 372 is passed through the through hole of the first conductive member 345.

  Further, as shown in FIG. 7, the first voltage terminal 470 and the first conductive member 445 may be disposed apart from each other in the plane direction of the case 4, and may be connected to each other within the case 4 by a wiring 478. The first voltage terminal 470 includes a protrusion 472 that penetrates the case 4 and the gasket 442, and a nut 476. The first end 478a of the wiring 478 is welded to a portion of the protrusion 472 located in the case 4. It is fixed by. Similar to the first embodiment, the tab 446 is bent and is in contact with the first conductive member 445 on the upper surface thereof. The tab 446 and the first conductive member 445 are provided with through holes (not shown), and the member 447 is inserted into the through holes. A second end portion 478b of the wiring 478 is sandwiched between the bent lower surface of the tab 446 and the member 447, and is fixed to each other by welding. A wiring member 480 connected to the voltage monitoring unit is sandwiched between the nut 476 and the case 4.

  The power storage device 100 may have a second voltage terminal having the same form as the various first voltage terminals described above, thereby fixing the case 4 and the third conductive member 24. The same effects as above can be obtained. When providing the 2nd voltage terminal which penetrates case 4, it is preferred to have the same form as the 1st voltage terminal used as a pair. Part or all of the components of the first voltage terminal and the second voltage terminal can be shared, which is advantageous in terms of cost.

  In the above embodiment, the case where the first polarity electrode on which the current interrupting device is installed is the positive electrode and the second polarity electrode is the negative electrode has been described as an example. That is, in the above embodiment, the current interrupt device and the first voltage terminal are arranged on the positive electrode energizing path, but conversely, they may be arranged on the negative electrode energizing path.

  As mentioned above, although embodiment and the Example of this invention were described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  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.

2 Electrode assembly 4 Case 10 Negative electrode terminal 12 Inner nut 14 Bolt 16 Outer nuts 22, 42, 442 Gasket 24 Third conductive member 24a Third connection portions 26, 46, 446 Tab 30 Positive electrode terminal 32 Inner nut 34 Bolt 36 Outer nut 44 Second conductive member 45, 345, 445 First conductive member 45a First connection part 45b Second connection part 50 Current interrupt device 52 Support member 55 Marking part 56 Diaphragm 56a Central part 56b, 56c Both end parts 70, 470 First 1 voltage terminal 72,372,472 protrusion part 76,476 nut 80,480 wiring member 82 2nd voltage terminal 100,700 power storage apparatus 200,800 power storage apparatus module 210,810 voltage monitoring unit 211,811 A / D conversion part 212 , 812 MUX
213, 813 Output signal 220, 820 Power storage unit 230 Power load 478 Wiring 480 Wiring member

Claims (5)

Case and
An electrode assembly housed in a case and comprising a first electrode having a first polarity and a second electrode having a second polarity;
A first electrode terminal for transferring electricity to and from the first electrode of the electrode assembly;
A second electrode terminal for transferring electricity to and from the second electrode of the electrode assembly;
A first conductive member housed in the case and connected to the first electrode;
A second conductive member housed in the case and connected to the first electrode terminal;
A third conductive member housed in the case and connected to the second electrode and the second electrode terminal;
A current interrupting device that is accommodated in the case, connected in series with the first conductive member and the second conductive member, and connects or interrupts an energization path from the electrode assembly to the electrode terminal;
A power storage device comprising a first voltage terminal and a second voltage terminal insulated from the case,
A first connecting portion which is a connecting portion between the first electrode and the first conductive member;
A second connecting portion which is a connecting portion between the first conductive member and the current interrupt device;
A third connecting portion which is a connecting portion between the second electrode and the third conductive member;
A fourth connecting portion that is a connecting portion between the second electrode terminal and the third conductive member;
The first voltage terminal is connectable to a voltage monitoring unit and is connected to the first connection part, the second connection part, or between the first connection part and the second connection part. And
The second voltage terminal can be connected to the voltage monitoring unit, and the third connection portion, the fourth connection portion, the third connection portion and the fourth connection portion, or the second connection portion. Connected to one of the electrode terminals ,
At least one of the first voltage terminal and the first conductive member is provided with a protrusion extending from the first conductive member to the case side,
The power storage device, wherein the first voltage terminal is connected to the first conductive member via the protrusion . The power storage device according to claim 1 , wherein the second voltage terminal is connected to the second electrode terminal and is provided outside the case. The power storage device according to claim 1 , wherein the second voltage terminal is connected to the third conductive member. The power storage device electric storage device according to any one of claims 1 to 3 is a secondary battery. A power storage unit having a plurality of power storage devices according to any one of claims 1 to 4 ,
A power storage device module including a voltage monitoring unit,
The first electrode terminal and the second electrode terminal of each of the plurality of power storage devices, the plurality of power storage devices are connected in series with each other,
The first voltage terminal and the second voltage terminal of each of the plurality of power storage devices are connected to the voltage monitoring unit.

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