JP3843976B2 - Assembled battery - Google Patents

Description

  The present invention relates to an assembled battery that is optimal as a power source that supplies large energy with high energy density, small size, and light weight.

  In recent years, in response to growing environmental awareness, there is a movement to shift the power source of automobiles from engines that use fossil fuels to motors that use electrical energy. For this reason, the technology of the battery that serves as the power source of the motor is also rapidly developing.

  An automobile is desired to be mounted with a battery that is small and light and can be charged and discharged with a large amount of electric power and has excellent vibration resistance and heat dissipation. As an assembled battery excellent in heat dissipation capable of supplying large electric power, there is a battery as shown in Patent Document 1 below.

The assembled battery disclosed in Patent Document 1 includes a plurality of single cells electrically connected in series, parallel, or series-parallel at predetermined intervals in the thickness direction of the single cells, and both sides between the single cells. A pressing member that presses the unit cell is disposed, and a plurality of unit cells are fixed by an exterior member. By adopting such a structure, the heat dissipation characteristics of the single battery are improved, and the cycle characteristics and rate characteristics as an assembled battery are improved.
JP 2000-195480 A (see paragraph numbers “0014” to “0029” and the descriptions of FIGS. 1, 2, and 4)

  Since the assembled battery of Patent Document 1 uses a flat battery as a single battery, the battery has the same energy capacity and higher energy density than a conventional assembled battery configured using a battery other than the flat battery. If so, downsizing is possible. For this reason, the assembled battery comprised by the flat battery is suitable as a battery for motor vehicles from the point of a small size and a high energy density.

  However, in the assembled battery of Patent Document 1, single cells are sequentially stacked and connected. When the cells are connected in series, the total voltage of the stacked cells increases every time they are stacked. At the end of the assembled battery, the total voltage is very high, for example, 250V to 300V. In addition, if the cells are connected, the operator must handle a high-voltage battery, and work while paying attention to the handling, so that workability is poor.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an assembled battery capable of connecting a plurality of unit cells in series with good workability.

  The assembled battery of the present invention includes a plurality of unit cells stacked, a conductive means having conductivity, and an insulating means having insulating properties, and the conductive means and the insulating means are provided in the unit cell. Alternatingly arranged in the stacking direction across the electrode terminals of the unit cells, the unit cells are electrically connected in the stacking direction, and the conductive means rotates about a rotation axis extending in the stacking direction of the unit cells. By doing so, it is possible to switch between the single cells to conduction or non-conduction.

In the present invention, by rotating the conductive means, it is possible to switch between the single cells between conduction and non-conduction, so that a plurality of stacked unit cells can be connected later. Here, for example, a plurality of unit cells are connected to such an extent that the voltage does not become high, and a connection body is configured. Finally, the connection bodies can be connected to each other. In this way, since a plurality of connecting bodies are first configured in the assembled battery, and the connecting bodies are finally connected to each other, it is not necessary to perform work while paying attention to the voltage, thereby improving workability. .

  The assembled battery of the present invention includes a plurality of unit cells stacked, a conductive means having conductivity (a conductive washer), and an insulating means having an insulating property (insulating washer). The insulating means are alternately arranged in the stacking direction of the unit cells with the electrode terminals of the unit cells interposed therebetween, and electrically connect the unit cells in the stacking direction, and the conductive means are stacked in the stacking direction of the unit cells. Between the single cells can be switched between conduction and non-conduction.

  Hereinafter, this feature will be described in detail with reference to the drawings, divided into [Embodiment 1] and [Embodiment 2].

[Embodiment 1]
In the assembled battery according to the first embodiment, the conductive means rotates about the rotation axis so that a part of the conductive means enters between the electrode tabs of the unit cells above and below the stack.

  FIG. 1 is a perspective view showing a single cell.

  The unit cell 1 is a flat battery, and includes a plurality of stacked power generation elements (not shown) in which a positive electrode plate, a negative electrode plate, and a separator are sequentially stacked. In the following description, such a flat cell is simply referred to as a cell.

  The unit cell 1 is a secondary battery such as a lithium ion secondary battery, for example. The unit cell 1 includes a positive electrode tab 10 and a negative electrode tab 12 as two electrode tabs extending in a direction orthogonal to the stacking direction. A peripheral edge 14 is provided around the unit cell 1.

  FIG. 2 is a schematic diagram showing the assembled battery of the first embodiment. In FIG. 2, a conductive washer and an insulating washer described later are omitted.

  In the present embodiment, the unit cell 1 is positioned and arranged on plate-like frames 2 a and 2 b (hereinafter collectively referred to as the frame 2), and the frame 2 is stacked to be stacked as an assembled battery. . Here, the unit cells 1 are stacked such that the positive electrode tabs 10 and the negative electrode tabs 12 are alternately arranged in the stacking direction.

  An opening 20 that is slightly smaller than the peripheral edge 14 of the unit cell 1 is formed at the center of the frame 2, and the frame 2 supports the peripheral part 14 of the unit cell 1. By this opening 20, the upper part of the lower unit cell 1 and the lower part of the upper unit cell 1 can be in contact with each other during lamination. Therefore, after assembling the assembled battery, a uniform surface pressure can be applied to each unit cell 1 by sandwiching all the stacked unit cells 1 from both sides in the stacking direction by pressure applying means (not shown).

  The frame 2 includes a frame 2a in which an insulating washer 4 (insulating means) described later is incorporated, and a frame 2b in which a conductive washer 3 (conductive means) is disposed.

  In the frame 2a, a hole 21 and a space 23 are formed. As will be described later, the insulating washer 4 is incorporated into the hole 21. The space 23 is provided to pass the positive electrode tab 10 and the negative electrode tab 12 joined over the upper and lower layers. The positive electrode tab 10 and the negative electrode tab 12 are joined by, for example, ultrasonic welding.

  The frame 2b has a notch 25 at the end on the same side as the hole 21 of the frame 2a. This notch 25 is formed in a range that does not prevent rotation of a conductive washer 3 described later.

  Next, a description will be given focusing on the conductive washer which is a characteristic part of the present invention.

  3 is a side view showing a part of the assembled battery of the first embodiment, FIG. 4 is a view showing a rotating shaft, FIG. 5 is a plan view of a conductive washer, FIG. 6 is a plan view of an insulating washer, and FIG. FIG. 8 is a plan view of the insulating washer disposed on the frame, FIG. 9 is a perspective view showing the assembled battery before rotating the conductive washer, and FIG. 10 shows the assembled battery after rotating the conductive washer. FIG. 11 is a side view, and FIG. 11 is a perspective view showing the assembled battery after rotation of the conductive washer. 3 and FIGS. 9 to 11, the frame 2 is omitted. 4A is a perspective view of the rotating shaft, FIG. 4B is a schematic plan view of the rotating shaft, FIG. 5A is a conductive washer before insertion of the rotating shaft, and FIG. FIG. 6A shows an insulating washer before insertion of the rotating shaft, and FIG. 6B shows an insulating washer after insertion of the rotating shaft.

  In the present embodiment, the rotating shaft 5 shown in FIG. 3 is inserted through the conductive washer 3 of the conductive member and the insulating washer 4 of the insulating member. The rotating shaft 5 is covered with a heat-shrinkable resin tube, and an insulating layer is formed on the surface. Threaded portions 52 (see FIG. 4) are formed above and below the rotary shaft 5 so as to be screwable with the nut 6. Further, as shown in FIGS. 4A and 4B, the rotating shaft 5 is formed with convex portions 50 extending in the longitudinal direction of the rotating shaft 5 at four locations around the rotating shaft 5. One convex portion 50a among the four convex portions 50 is formed larger than the other convex portions 50 as shown in FIG.

  As shown in FIGS. 3 and 5, the conductive washer 3 is formed in a disk shape, and a hole 30 is formed at a position shifted outward from the center. The rotary shaft 5 is inserted through the hole 30. As shown in FIG. 5A, a groove 31 that matches the convex portion 50 of the rotating shaft 5 is formed in the hole 30 of the conduction washer 3. Here, since the convex part 50a of the rotating shaft 5 only coincides with the groove 31a, when the rotating shaft 5 is inserted into the conducting washer 3, as shown in FIG. The posture of the washer 3 is uniquely determined.

  As shown in FIG. 6, the insulating washer 4 has a hole 40 through which the rotating shaft 5 is inserted. As shown in FIG. 6 (A), the hole 40 is a hole having a diameter equal to or larger than the maximum diameter of the rotating shaft 5, and is therefore larger than the hole 30 formed in the conductive washer 3, and is shown in FIG. 6 (B). As shown, even if the rotating shaft 5 is inserted, the rotating shaft 5 is not fitted.

  As shown in FIG. 3, the conductive washer 3 and the insulating washer 4 are stacked in a state where the rotating shaft 5 is inserted, and the rotating shaft 5 is fastened from above and below by a nut 6.

  Here, as described above, all the conductive washers 3 are uniquely determined by the rotating shaft 5, and initially, as shown in FIG. 3, as shown in FIG. It arrange | positions on the outer side of the cell 1 so that it may not contact. The conductive washer 3 is disposed so as to protrude from the notch 25 of the frame 2b as shown by a dotted line in FIG. 7 when it is disposed in the frame 2b. When the rotating shaft 5 is rotated, the conduction washer 3 rotates in the direction of the arrow in the notch 25 and is disposed at a position indicated by a solid line. Only after being disposed in this position, the conductive washer 3 contacts the negative electrode tab 12 of the lower unit cell 1 and the positive electrode tab 10 of the upper unit cell 1.

Further, as shown in FIG. 3, the insulating washer 4 is disposed between the positive electrode tab 10 and the negative electrode tab 12 of the upper and lower unit cells 1 by skipping one stage. The insulating washer 4 is incorporated in the frame 2a as shown in FIG. 8 when it is disposed in the frame 2a. Since the insulating washer 4 does not fit the rotating shaft 5 as described above, the insulating washer 4 does not interlock with the rotating shaft 5.

  The conductive washer 3 and the insulating washer 4 thus provided in the assembled battery are as shown in FIG. 9 as a perspective view. When the rotating shaft 5 is rotated from this state, as shown in FIGS. 10 and 11, the conductive washer 3 rotates in conjunction with each other and enters between the positive electrode tab 10 and the negative electrode tab 12. The conductive washer 3 comes into contact with the upper and lower positive electrode tabs 10 and the negative electrode tab 12 to electrically connect the cells 1 to each other in series. Thereby, in the case of the assembled battery as shown in FIGS. 2-11, the assembled battery in which an electric current flows from the upper layer of a lamination | stacking toward a lower layer is comprised. Naturally, by changing the direction in which the single cells 1 are stacked, a current can be passed from the lower layer to the upper layer of the stack.

  When rotating the rotating shaft 5, for example, it is conceivable to form a −-type groove on the upper end surface or the lower end surface of the rotating shaft 5 and insert a screwdriver into the groove to rotate the rotating shaft 5. The nut 6 may be rotated to rotate the rotating shaft 5. An insulated tool is used for the rotation.

  As described above, in the present embodiment, by rotating the conduction washer 3, the conduction washer 3 can be disposed between the positive electrode tab 10 and the negative electrode tab 12 of the unit cell 1 after stacking the batteries, and a plurality of components in the assembled battery can be arranged. The single cell 1 can be connected at a time. Therefore, the operator can perform the work without paying attention to the handling of the connection body that is connected to the unit cell 1 and has a high voltage, and the workability can be improved.

  In addition, even if a failure occurs in one of the single cells 1 after being assembled as a battery assembly, the single battery 1 is rotated by rotating the conductive washer 3 so that it is removed from between the positive electrode tab 10 and the negative electrode tab 12. Can be easily removed.

  In addition, although the said embodiment demonstrated the case where the some conduction washer 3 was rotated collectively, this invention is not limited to this. The conduction washers 3 may be individually rotatable. In this case, the convex part 50 is not formed in the rotating shaft 5. Instead, the conductive washer 3 can be rotated around the rotation shaft 5 by attaching a handle to the conductive washer 3 and holding the handle with a tool.

  Thus, if the conduction washer 3 can be rotated individually, the plurality of single cells 1 can be connected separately. Thereby, for example, a conductive washer is rotated every predetermined number, a plurality of single cells 1 are connected to such an extent that a high voltage is not generated, and a connection body is configured. Finally, the connection bodies are connected to each other. You can also. In this way, in the assembled battery, a plurality of connection bodies are configured first, and finally, the connection bodies are connected to each other to reduce the number of cell connection operations under high voltage. Improvements can be made.

[Embodiment 2]
In the first embodiment, the conductive washer 3 that is not initially disposed between the positive electrode tab 10 and the negative electrode tab 12 of the upper and lower unit cells 1 is rotated to be disposed between the positive electrode tab 10 and the negative electrode tab 12. In other words, the single cells 1 were electrically connected together. In the second embodiment, although the insulating washer is disposed between the positive electrode tab 10 and the negative electrode tab 12 in advance, the unit cell 1 is not electrically connected between the unit cells 1 and is rotated by a part of the conduction washer. It is possible to connect them electrically at once.

Specifically, in the assembled battery of Embodiment 2, the conductive means has a two-layer structure including a first layer and a second layer, and the first layer includes a first main body portion formed of a conductive member and And a protrusion made of an insulating member provided on the first main body, and the second layer is provided on the second main body and the protrusion can be fitted into the second main body made of a conductive member. In the first layer and the second layer, the protrusion does not fit into the hole at first, and the first main body and the second main body do not contact each other. And by rotating the first layer relative to the second layer around the rotation axis, the protrusion fits into the hole, and the first main body and The second main body portion comes into contact and becomes conductive.

  In the following, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  FIG. 12 is a schematic diagram showing the assembled battery of the second embodiment. In FIG. 12, a conductive washer and an insulating washer described later are omitted.

  As in the first embodiment, the unit cells 1 are positioned and arranged on the frame 2, and the frame 2 is stacked to be stacked as an assembled battery. The positive electrode tab 10 and the negative electrode tab 12 are laminated so as to alternate in the lamination direction. In the frame 2, an opening 20 that is slightly smaller than the peripheral edge portion 14 of the unit cell 1 is formed in the center, and supports only the peripheral portion 14 of the unit cell 1. After assembling the assembled battery, all the single cells 1 are given a uniform surface pressure.

  The frame 2 includes a frame 2c in which an insulating washer 4 described later is incorporated, and a frame 2d in which a conductive washer 3 is disposed.

  The frame 2c has a hole 26 and a space 27 formed therein. The insulating washer 4 is incorporated in the hole 26. The space 27 is provided, for example, for passing the positive electrode tab 10 and the negative electrode tab 12 joined by ultrasonic welding.

  The frame 2d has a hole 28 at the end on the same side as the hole 26 of the frame 2c. The hole 28 incorporates a conductive washer 7 described later.

  Next, a description will be given focusing on the conductive washer which is a characteristic part of the present invention.

  13 is a side view showing a part of the assembled battery according to the second embodiment, FIG. 14 is a plan view of the first conductive washer, FIG. 15 is a plan view of the second conductive washer, and FIG. 16 is a first view arranged on the frame. FIG. 17 is a plan view of the second conductive washer disposed on the frame, FIG. 18 is a perspective view showing the assembled battery before the conductive washer is rotated, and FIG. 19 is a side view showing the assembled battery after the conductive washer is rotated. FIG. 20 and FIG. 20 are perspective views showing the assembled battery after rotation of the conductive washer. In FIG. 13 and FIGS. 18 to 20, the frame 2 is omitted. 14A is a first conductive washer before insertion of the rotary shaft, FIG. 14B is a first conductive washer after insertion of the rotary shaft, and FIG. 15A is a second conductive washer before insertion of the rotary shaft, FIG. 15B shows the second conductive washers after the rotation shaft is inserted.

  In the present embodiment, the rotating shaft 5 shown in FIG. 13 is inserted through the conductive washer 7 and the insulating washer 4. The rotating shaft 5 and the insulating washer 4 are the same as those in the first embodiment.

  As shown in FIGS. 13 to 15, the conductive washer 7 is formed in a disc shape, and has a two-layer structure including a first conductive washer (first layer) 70 and a second conductive washer (second layer) 75. Have. As shown in FIG. 14A, the first conduction washer 70 includes a first body portion 71 made of a conductive member such as copper or iron, and an insulating material such as resin or ceramic provided on one surface of the first body portion 71. And a projecting portion 72.

  A hole 73 is formed in the center of the first main body 71. A groove 74 is formed in the hole 73 so as to match the convex portion 50 of the rotating shaft 5. The groove 74 includes a groove 74a that is formed wider than the others so as to match the convex portion 50a. Therefore, since the convex part 50a of the rotating shaft 5 only coincides with the groove 74a, when the rotating shaft 5 is inserted through the first conduction washer 70, as shown in FIG. The posture of the first conduction washer 70 is uniquely determined.

  As shown in FIG. 15A, the second conduction washer 75 includes a second main body portion 76 made of a conductive member such as copper or iron, and a hole portion 77 provided in the second main body portion 76.

  A hole 78 is formed in the center of the second main body 76. The hole 78 is a hole having a diameter larger than the maximum diameter of the rotating shaft 5, and is therefore larger than the hole 73 formed in the first conduction washer 70. As shown in FIG. Even if 5 is inserted, it does not fit with the convex part 50 of the rotating shaft 5.

  Further, the second body portion 76 is provided with a protrusion 79 on the outer periphery thereof. This protrusion 79 coincides with the recess 29 (see FIG. 17) provided in the frame 2d when the conductive washer 7 is disposed on the frame 2d. Thereby, the attitude | position of the 2nd conduction washer 75 with respect to the flame | frame 2d is defined uniquely, and the attitude | position of the 2nd conduction washer 75 of each hierarchy is defined equally.

  The hole 77 is a hole larger than the protrusion 72 of the first conduction washer 70, and is formed in a shape in which the protrusion 72 can be fitted. When three protrusions 72 are formed on the first conductive washer 70, three holes 77 are formed at corresponding positions so that these three can fit into the hole 77 simultaneously.

  The first conductive washer 70 is as shown in FIG. 16 when placed in the frame 2d. The first conductive washer 70 is not provided with a protrusion 79 like the second conductive washer 75. Therefore, since it is not positioned by the concave portion 29 of the frame 2d, it can rotate within the frame 2d according to the rotation of the rotary shaft 5.

  On the other hand, the second conductive washer 75 is as shown in FIG. 17 when placed in the frame 2d. As described above, since the protrusion 79 is fitted in the concave portion 29 of the frame 2d, the posture of the second conductive washer 75 is uniquely fixed. Further, since the second conduction washer 75 is not fitted to the rotating shaft 5, it does not interlock with the rotation of the rotating shaft 5.

  With the first conductive washer 70 and the second conductive washer 75 arranged on the frame 2d as described above, the conductive washer 7 is alternately stacked with the insulating washer 4, as shown in FIG. Here, the rotating shaft 5 is inserted into the first conductive washer 70, the second conductive washer 75, and the insulating washer 4, and is temporarily tightened from above and below by the nut 6. A perspective view is as shown in FIG.

  When the assembled battery is assembled, the rotating shaft 5 is prevented from rotating with a jig or the like so that the rotating shaft 5 does not rotate arbitrarily. Thereby, the rotating shaft 5 does not rotate freely, and the protrusion 72 of the first conduction washer 70 does not fit into the hole 77 of the second conduction washer 75. For example, as shown in FIGS. 16 and 17, the position of the rotating shaft 5 is fixed so that the positions of the protrusion 72 and the hole 77 are shifted. Thereby, the 1st conduction washer 70 and the 2nd conduction washer 75 can contact only with insulating projection part 72, and can maintain the state where it does not conduct mutually.

  After assembling, the rotating shaft 5 is released from the jig, and the rotating shaft 5 is rotated. Since the first conduction washer 70 also rotates in conjunction with the rotation shaft 5, the positions of the protrusion 72 and the hole 77 coincide with each other and the protrusion 72 fits into the hole 77 all at once. When the protrusion 72 is fitted, the first main body 71 of the first conductive washer 70 and the second main body 76 of the second conductive washer 75 come into contact with each other, and the stacked cells are connected in series. When the protrusion 72 is fitted, a gap is formed between the nuts 6, and the nut 6 is further tightened.

  As described above, the positive electrode tab 10 and the negative electrode tab 12 of the cell 1 are electrically connected together via the conduction washer 7. The state of the conductive washer 7 at this time is as shown in FIGS. In the case of the assembled battery as shown in FIGS. 12 to 20, an assembled battery in which current flows from the upper layer to the lower layer of the stack is configured. Naturally, by changing the direction in which the single cells 1 are stacked, a current can be passed from the lower layer to the upper layer of the stack.

  When rotating and rotating the rotating shaft 5 described above, for example, a -type groove is formed on the upper end surface or the lower end surface of the rotating shaft 5, and a tool such as a screwdriver is inserted into the groove. It can be fixed or rotated. The tool used here is an insulated one.

  As described above, in the present embodiment, by rotating the first conductive washer 70 of the conductive washer 7, the first conductive washer 70 that is not initially conductive and the second conductive washer 75 are electrically connected. As a result, the positive electrode tab 10 and the negative electrode tab 12 of the unit cell 1 that are stacked one above the other can be collectively conducted later. Therefore, the operator can connect the single cells 1 in a lump without paying attention to the voltage of the assembled battery, and workability can be improved.

It is a perspective view which shows a cell. 1 is a schematic diagram showing an assembled battery according to a first embodiment. 3 is a side view showing a part of the assembled battery of Embodiment 1. FIG. It is a figure which shows a rotating shaft, FIG. 4 (A) is a perspective view of a rotating shaft, FIG.4 (B) is a schematic plan view of a rotating shaft. FIG. 5A is a plan view of the conductive washer, FIG. 5A is a diagram illustrating the conductive washer before insertion of the rotary shaft, and FIG. 5B is a diagram illustrating the conductive washer after insertion of the rotary shaft. It is a top view of an insulating washer, 6 (A) is an insulating washer before rotation axis insertion, and FIG. 6 (B) is a figure which shows the insulation washer after rotation axis insertion. It is a top view of the conduction washer arrange | positioned at the flame | frame. It is a top view of the insulation washer arrange | positioned at the flame | frame. It is a perspective view which shows the assembled battery before a conduction washer rotation. It is a side view which shows the assembled battery after a conduction washer rotation. It is a perspective view which shows the assembled battery after a conduction washer rotation. It is this schematic diagram which shows the assembled battery of this Embodiment. 4 is a side view showing a part of the assembled battery of Embodiment 2. FIG. FIG. 14A is a plan view of the first conduction washer, FIG. 14A is a diagram showing the first conduction washer before insertion of the rotation shaft, and FIG. 14B is a diagram showing the first conduction washer after insertion of the rotation shaft. FIG. 15A is a plan view of a second conduction washer, FIG. 15A is a diagram showing a second conduction washer before the rotation shaft is inserted, and FIG. 15B is a diagram showing a second conduction washer after the rotation shaft is inserted. It is a top view of the 1st conduction washer arrange | positioned at the flame | frame. It is a top view of the 2nd conduction washer arrange | positioned at the flame | frame. It is a perspective view which shows the assembled battery before a conduction washer rotation. It is a side view which shows the assembled battery after a conduction washer rotation. It is a perspective view which shows the assembled battery after a conduction washer rotation.

Claims (5)

A plurality of unit cells stacked;
A conductive means having electrical conductivity;
Insulating means having insulating properties;
Have
The conductive means and the insulating means are alternately arranged across the unit cell electrode terminals in the stacking direction of the unit cells, and electrically connect the unit cells in the stacking direction,
The assembled battery is configured to be capable of switching between the single cells between conduction and non-conduction by rotating about the rotation axis extending in the stacking direction of the single cells.   The conductive means rotates about the rotation axis, so that a part of the conductive means enters between the electrode terminals of at least a pair of the unit cells of the stacked unit cells, and the electrode tabs. The assembled battery according to claim 1, wherein at least a pair of the single cells are connected to each other by contact. The conductive means has a two-layer structure consisting of a first layer and a second layer,
The first layer includes a first body portion made of a conductive member, and a protrusion portion made of an insulating member provided on the first body portion,
The second layer includes a second main body portion made of a conductive member, and a hole provided in the second main body portion into which the protrusion can be fitted,
In the first layer and the second layer, the projecting portion is not fitted in the hole portion, and the rotating shaft is in a non-conducting state where the first main body portion and the second main body portion are not in contact with each other. By rotating the first layer relative to the second layer around the center, the protrusion fits into the hole and the first main body and the second main body come into contact with each other. The assembled battery according to claim 1, wherein the battery pack is in a conductive state.   4. The assembled battery according to claim 2, wherein a plurality of the conductive means are provided, and the plurality of conductive means can be collectively rotated about the rotation axis.   The said single cell is a flat type single cell, The said electrode terminal is a plate-shaped electrode tab extended in the direction orthogonal to the thickness direction of the said flat type battery, The 1 to 4 characterized by the above-mentioned. The assembled battery according to any one of the above.

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