JP2014026798A - Battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large secondary battery in which disconnection between an output/input terminal and a unit cell is prevented.SOLUTION: A battery includes a thin plate 17 which holds a unit cell 11 at a position where the unit cell 11 is not brought into contact with an inner wall of an outer packaging body 12 even when the unit cell 11 is moved in a state where the unit cell 11 is closest to the inner wall of the outer packaging body 12, and holds the unit cell 11 at a position where electrical connection by electrode tabs 13 and 14 can be maintained even when the unit cell 11 is in a state where the unit cell 11 is most apart from the inner wall of the outer packaging body 12.

Description

  The present invention relates to the structure of a battery such as a non-aqueous electrolyte secondary battery.

  In the field of non-aqueous electrolyte secondary batteries, the size of single cells has been increased with the recent increase in capacity and cost of energy devices.

  In the case of a large non-aqueous electrolyte secondary battery, in order to improve reliability, it is common to use a metal can as an exterior body instead of an exterior body composed of a laminate sheet mainly composed of a resin film or the like. is there.

  When a battery having a laminated structure composed of a positive electrode plate and a negative electrode plate facing each other with a separator in between is accommodated in the exterior body, when the battery is subjected to strong impact or vibration, the unit cell moves inside the exterior body, and the input / output terminal In some cases, the connection between the electrode terminal of the unit cell and the unit cell is cut off.

  That is, due to the movement of the unit cell, bending or bending stress acts on the connection part between the electrode terminal and the input / output terminal of the unit cell, and the connection part is cut.

  As a technique for preventing disconnection of the connection portion between the input / output terminal and the electrode terminal of the unit cell, for example, there is a technique disclosed in Patent Document 1 listed below.

  In the technique of Patent Document 1, a laminated battery is provided with a substantially S-shaped bent portion on a lead terminal having one end welded to each of positive and negative electrode terminal portions of a unit cell in which a positive electrode, a separator, and a negative electrode are laminated and integrated. By bending and stretching the substantially S-shaped bent portion, the stress caused by the movement of the unit cell due to impact and vibration is absorbed and the cutting of the lead terminal is prevented.

JP 2000-215877 A (published August 4, 2000)

  However, when the above-described conventional technology is applied to a large battery as it is, it is difficult to prevent the connection portion between the input / output terminal and the electrode terminal of the unit cell from being cut only by the structure of the lead terminal bent into an S shape. There is a problem that.

  The cause of the above problem is due to the following two reasons.

  The first reason is that the unit cell becomes heavier due to the increase in the size of the unit cell. Therefore, in the case of the large unit cell, the movement of the unit cell in the exterior body tends to be intense as compared with the case of the small unit cell.

  As the weight of the unit cell increases, it becomes difficult to absorb the stress due to the movement of the unit cell only by bending or stretching of the substantially S-shaped bent portion provided on the lead terminal. It has become difficult to prevent lead terminals from being cut or welded.

  Naturally, the lead terminal that controlled the movement of the unit cell in the exterior body is cut or the welding of the lead terminal is peeled off, so that the movement of the unit cell in the exterior unit cannot be controlled. There is a risk that an internal short circuit may occur due to contact with the exterior body.

  Secondly, in a large battery, since a metal can is generally used as an exterior body, not an exterior body composed of a laminate sheet, the movement of the unit cell within the exterior body tends to be intense.

  Since the laminate sheet is a soft material mainly composed of a resin film, the ratio of the external force absorbed by the laminate sheet is large in the entire external force applied to the battery.

  On the other hand, when using a metal can that is harder than the laminate sheet as the exterior body, the unit cell in the exterior body is out of the total external force applied to the battery as compared with the case where the exterior body is composed of the laminate sheet. A greater proportion of external force is applied.

  In addition, since the metal plate is more slippery than the resin film, even when the inner surface of the metal can is not coated with resin or the like, even if the separator contacts the inner surface of the metal can, the element in the metal can Battery movement tends to be intense.

  The present invention has been made in view of the above-described problems, and an object of the present invention is a large-sized battery, which prevents disconnection between an input / output terminal and a unit cell, and at the same time, contacts between the unit cell and an exterior body. An object of the present invention is to provide a battery that prevents an internal short circuit due to the above.

In order to solve the above problems, a battery according to the present invention is
(A) A unit cell in which positive and negative electrode plates are stacked with a separator sandwiched between them is accommodated in an exterior body so as to be movable along one axis, and on the inner wall of the exterior body to which the unit cell is separated from and connected by the movement. A battery in which the provided electrode terminal and the electrode plate are electrically connected by an electrode tab,
(B) Even when the unit cell is closest to the inner wall of the exterior body by the movement, the unit cell is held at a position where the unit cell is not in contact with the inner wall of the exterior body, and the unit cell is moved by the movement. Is provided with a movement control body that holds the unit cell at a position where electrical connection by the electrode tab can be maintained even in a state of being most separated from the inner wall of the exterior body.

  According to the above configuration, since the unit cell can move within the exterior body, the unit cell gently absorbs the impact applied to the battery by moving within the exterior body, and the unit cell itself directly You won't get all the impact on the battery. As a result, it is possible to avoid a situation in which a large displacement is applied to the unit cell to cause a stacking deviation in the unit cell, causing a short circuit between the positive electrode plate and the negative electrode plate.

  Further, according to the above configuration, even when the unit cell is moved to a position closest to the inner wall of the exterior body by the movement control body, the unit is held at a position that does not contact the inner wall of the exterior body. Even in a state where it is moved to a position farthest from the inner wall, it is held at a position where electrical connection by the electrode tab can be maintained. Thereby, the contact with a unit cell and an exterior body, ie, the short circuit inside a battery, can be prevented.

  Furthermore, according to the above configuration, since the movement control body controls the movement of the unit cells in the exterior body, it is possible to prevent the positive electrode tab and the negative electrode tab from being disconnected due to the movement of the unit cells in the exterior body. That is, disconnection between the unit cell and the input / output terminal can be prevented.

  In addition, since a space in which the unit cell can move is provided in the exterior body, the amount of electrolyte solution retained in the battery is increased, and the battery life can be expected to be extended.

  Furthermore, in the battery according to the present invention, it is preferable that the movement control body is fixed to the unit cell and moves in the exterior body together with the unit cell.

  According to the above configuration, further, the movement control body fixed to the unit cell can prevent the disconnection and short circuit in the cell and can move inside the exterior body, so that the unit cell gently absorbs the impact applied to the cell. can do.

  Furthermore, according to said structure, it can prevent that a unit cell contacts with the inner surface of an exterior body, and is damaged by fixing a thin plate to the surface of a unit cell as a movement control body, for example. It becomes like this.

  Furthermore, in the battery according to the present invention, it is preferable that the movement control body is fixed to the exterior body.

  According to the above configuration, further, the movement control body fixed to the exterior body prevents disconnection and short circuit in the battery and can move within the exterior body, so that the unit cell gently absorbs the impact applied to the battery. can do. Moreover, the volume in the exterior body can be reduced as compared with the case where the movement control body is fixed to the unit cell.

  Furthermore, in the battery according to the present invention, it is preferable that the electrode terminal is disposed on each of the opposing inner walls of the outer casing, in which the positive electrode and the negative electrode are separated from and connected to each other by the movement.

  According to the above configuration, in the battery in which the positive electrode terminal and the negative electrode terminal are arranged on two different planes, the destruction of the unit cell due to the impact applied to the battery, the internal short circuit, and the internal disconnection It can be avoided.

  Furthermore, in the battery according to the present invention, it is preferable that both the positive electrode and the negative electrode of the battery terminal are disposed on one of the opposing inner walls of the exterior body where the unit cell is separated from and contacting by the movement.

  According to the above configuration, furthermore, in the battery in which the positive electrode terminal and the negative electrode terminal are arranged on one plane, the destruction of the unit cell due to the impact applied to the battery, the internal short circuit, and the internal disconnection are avoided. be able to. In addition, the volume in the outer package can be reduced as compared with the case where the positive electrode and the negative electrode of the electrode terminal are arranged on one of the inner walls of the outer package facing each other.

  Furthermore, in the battery according to the present invention, the outer package is preferably made of metal.

  According to the above configuration, the impact applied to the battery is easily transmitted to the unit cell, and further, in the battery using the metal can as the exterior body, in which the unit cell tends to move violently in the exterior body, By ensuring the movement of the unit cell within the exterior body, it is possible to reduce the possibility that the unit cell gently absorbs the impact and the unit cell itself is destroyed.

  Moreover, according to said structure, the cutting | disconnection and short circuit within a battery can be prevented with a movement control body.

  As described above, the battery according to the present invention holds the unit cell in a position where the unit cell does not contact the inner wall of the exterior body, even when the unit cell is closest to the inner wall of the exterior body by movement, Even when the unit cell is farthest from the inner wall of the exterior body due to the movement, a movement control body that holds the unit cell at a position where the electrical connection by the electrode tab can be maintained is provided.

  Therefore, there is an effect that it is possible to prevent contact between the unit cell and the exterior body, that is, a short circuit inside the battery. Further, there is an effect that it is possible to prevent the disconnection of the positive electrode tab and the negative electrode tab, that is, the disconnection between the unit cell and the input / output terminal due to the movement of the unit cell in the exterior body. In addition, since a space in which the unit cell can move is provided in the exterior body, the amount of electrolyte solution retained in the battery is increased, and the battery life can be expected to be extended.

It is sectional drawing cut | disconnected along the lamination direction of a unit cell which shows the structure of the secondary battery which concerns on one embodiment of this invention. It is a schematic diagram when the secondary battery shown in FIG. 1 is looked down from the lamination direction of a unit cell so that the connection of an electrode plate and an electrode terminal can be understood. It is the table | surface which arranged the size of the secondary battery which conducted the impact tolerance experiment. It is the table | surface which put together the impact-resistant experiment result. FIG. 6 is a diagram showing experimental results of Comparative Example 1. It is a figure which shows the experimental result of the comparative example 2. It is a figure which shows the experimental result of the comparative example 3. It is a figure which shows the experimental result of the comparative example 4. It is a figure which shows the experimental result of the comparative example 5. It is a figure which shows the experimental result of the comparative example 6. It is a figure which shows the experimental result of the comparative example 7. It is a figure which shows the experimental result of the comparative example 8. It is sectional drawing cut | disconnected along the lamination direction of a unit cell which shows the structure of the secondary battery which concerns on another embodiment of this invention. It is a schematic diagram when the secondary battery shown in FIG. 13 is looked down from the lamination direction of a unit cell so that the connection of an electrode plate and an electrode terminal can be understood. It is sectional drawing cut | disconnected along the lamination direction of the unit cell which shows the structure of the secondary battery which concerns on another embodiment of this invention. It is a schematic diagram when the secondary battery shown in FIG. 15 is looked down from the lamination direction of a unit cell so that the connection of an electrode plate and an electrode terminal can be understood. 16 is a table in which sizes of secondary batteries used in experiments for confirming impact resistance of the secondary battery shown in FIG. 15 are arranged. It is the table | surface which put together the result of the impact tolerance experiment of the secondary battery shown in FIG. It is a figure which shows the experimental result of the secondary battery shown in FIG. FIG. 16 is a diagram showing an experimental result of a comparative example of the secondary battery shown in FIG. 15.

  The embodiment of the present invention will be described in detail with reference to FIGS. For convenience of explanation, in each drawing, the shape and the like of the secondary battery 1 are exaggerated and the length of each side is a, b, c, d1, d2, e, f, g, h. Each unit is “millimeter”. Which side lengths a, b, c, d1, d2, e, f, g, and h correspond to will be described later.

(1) Outline of Secondary Battery FIG. 1 is a sectional view showing the structure of a lithium ion secondary battery 1 according to an embodiment of the present invention, cut along the stacking direction of the unit cells, and FIG. It is a schematic diagram when the secondary battery 1 is looked down from the lamination direction of a unit cell.

  2 shows that in the unit cell 1, a positive electrode tab (electrode tab) 13 and a negative electrode tab (electrode tab) 14 are connected to a positive electrode plate (electrode plate) 111 and a negative electrode plate (electrode plate) 112, respectively. Is shown. Note that the separator 110, the positive electrode plate 111, and the negative electrode plate 112 have the same long side and short side length on the laminated surface.

  As shown in FIG. 1, the secondary battery 1 includes a unit cell 11 having a stacked structure in which a separator 110 is sandwiched between a positive electrode plate 111 and a negative electrode plate 112, and two surfaces perpendicular to the stacking direction of the unit cells 11. The thin plates 17 and 17 ′ fixed by the Kapton tape 18 and the exterior body 12 are included. Here, the unit cell 11 is accommodated in the exterior body 12 so as to be movable along one axis. In addition, the thin plate 17 (movement control body) provided below the unit cell 11 in FIG. 1 is configured so that the unit cell 11 remains in the exterior body 12 even when the unit cell 11 is closest to the inner wall of the exterior body 12 by the above movement. The unit cell 11 is held at a position not in contact with the inner wall, and the unit cell is maintained at a position where the electrical connection by the electrode tabs 13 and 14 can be maintained even when the unit cell 11 is farthest from the inner wall of the exterior body 12 by the above movement. 11 is held.

  The positive electrode plate 111 is connected to the positive electrode terminal (electrode terminal) 15 formed on one side wall of the outer package 12 via the positive electrode tab 13, and the negative electrode plate 112 is connected to the other side wall of the outer package 12. The negative electrode terminal (electrode terminal) 16 that is formed is connected via a negative electrode tab 14.

  Hereinafter, each part of the unit cell 11 will be described with an example of the size. The length a of the long side of the lamination surface is 335 mm, the length of the short side is 154 mm, and the thickness in the lamination direction is 5 mm.

  Regarding the thin plate 17, the length b of the long side of the thin plate 17 corresponding to the long side of the unit cell 11 is 365 mm, the length of the short side is 154 mm, and the thickness is 1 mm.

  The size of the plane of the thin plate 17 ′ parallel to the laminated surface of the unit cells 11 is the same as the size of the laminated surface of the unit cells 11, the long side is 335 mm, and the short side is 154 mm. is there. Further, the thickness of the thin plate 17 ′ is 1 mm.

  Similarly, for the exterior body 12, the length c of the long side of the exterior body 12 corresponding to the long side of the unit cell 11 is 375 mm, the length of the short side is 155 mm, and corresponds to the stacking direction of the unit cells 11. The height of the exterior body 12 is 8 mm.

  The long side of the stacked surface of the unit cell 11 corresponds to the long side of the thin plate 17 and the outer package 12, the short side of the unit cell 11 corresponds to the short side of the thin plate 17 and the package 12, and the unit cell 11 is stacked. The thickness in the direction corresponds to the thickness of the thin plate 17 and the outer package 12.

  The thin plates 17 and 17 ′ are fixed to the unit cell 11 by Kapton tape 18. The thin plate 17 is 15 mm longer than the unit cell 11 on the positive electrode terminal 15 side and 15 mm from the unit cell 11 on the negative electrode terminal 16 side. long. In addition, the difference of the thin plate 17 length by the side of the positive electrode terminal 15 compared with the unit cell 11 is set to e, and the difference by the side of the negative electrode terminal 16 is set to f. As shown in FIG. 1, the thin plate 17 ′ is fixed on the upper side of the stacked surface of the unit cell 1 so that there is no portion protruding from the stacked surface of the unit cell 1, and the thin plate 17 is the stacked surface of the unit cell 1. It is fixed to the lower side.

  With the thin plate 17 fixed to the lower surface of the unit cell 11 with the Kapton tape 18, the unit cell 11 can move in the outer package 12 within a range in which the thin plate 17 can move in the outer package 12.

  Specifically, the unit cell 11 has a length of 10 mm in the longitudinal direction of the laminated surface, ie, the length of the long side of the outer package 12 minus the length of the long side of the thin plate 17. Can move.

  Further, as described above, since the thin plate 17 is 15 mm longer than the unit cell 11 on the positive electrode terminal 15 side and the negative electrode terminal 16 side, the thin plate 17 is in contact with the inner wall of the exterior body 12. Is prevented.

  As is clear from the above size setting, the movable distance of the unit cell 11 in the outer package 12 in the stacking direction is 1 mm, and substantially the unit cell 11 in the stacking direction in the outer package 12. The movement of can be ignored.

  The length d1 of the long side of the positive electrode tab 13 is 60 mm, the length of the short side is 30 mm, the thickness is 100 μm, the length d2 of the long side of the negative electrode tab 14 is 60 mm, the length of the short side is 30 mm, and the thickness The thickness is 100 μm.

  One end in the longitudinal direction of the positive electrode tab 13 is welded to one end in the longitudinal direction of the positive electrode plate 111, and the other end of the positive electrode tab 13 is welded to the positive electrode terminal 15.

  Similarly, one end in the longitudinal direction of the negative electrode tab 14 is welded to one end in the longitudinal direction of the negative electrode plate 112, and the other end of the negative electrode tab 14 is welded to the negative electrode terminal 16.

  Here, as described above, the length of the long side of the unit cell 11 is 335 mm, the length of the long side of the exterior body 12 is 375 mm, and the thin plate 17 is disposed on the positive electrode terminal 15 side on the element side. 15 mm longer than the battery 11 and 15 mm longer than the unit cell 11 on the negative electrode terminal 16 side.

  When the unit cell 11 moves to the most negative electrode terminal 16 side in the outer package 12, the distance between the positive electrode plate 111 and the positive electrode terminal 15 is the longest, and the length is “the long side of the outer package 12 minus the thin plate 17. The difference in the distance between the long side + the thin plate 17 on the positive electrode terminal 15 side and the unit cell 11 ”is 25 mm.

  Since the length of the positive electrode tab 13 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111 is 60 mm, the positive electrode tab 13 is moved by this movement even when the unit cell 11 is moved to the most negative electrode terminal 16 side. It will not be cut.

  Similarly, the negative electrode tab 14 is not cut by this movement even when the unit cell 11 has moved most to the positive electrode terminal 15 side.

  In addition, when the unit cell 11 is located in the approximate center of the exterior body 12, as shown in FIG. 1, the positive electrode tab 13 and the negative electrode tab 14 are distorted in a substantially N shape.

  To summarize the contents described so far, the secondary battery 1 has the following structure.

  That is, first, the unit cell 11 is longer than the unit cell 11 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111 and the direction connecting the negative electrode terminal 16 and the negative electrode plate 112 and is longer than the outer package 12. It is fixed to a short thin plate 17. Accordingly, the unit cell 11 can move in the outer package 12 together with the thin plate 17 in a direction connecting the positive electrode terminal 15 and the positive electrode plate 111 or in a direction connecting the negative electrode terminal 16 and the negative electrode plate 112.

  That is, the unit cell 11 can move in the exterior case 12 in the terminal connection direction, the unit cell 11 gently absorbs the impact applied to the cell 1, and the unit cell 11 itself directly adds to the cell 1. Will not receive the impact. As a result, it is possible to avoid a situation in which stacking deviation occurs in the unit cell 11 due to a large force applied to the unit cell 11 and the positive electrode plate 111 and the negative electrode plate 112 cause a short circuit.

  Secondly, the thin plate 17 is longer than the unit cell 11 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111 and in the direction connecting the negative electrode terminal 16 and the negative electrode plate 112. Therefore, even if the unit cell 11 moves in the outer package 12 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111 and the direction connecting the negative electrode terminal 16 and the negative electrode plate 112, the unit cell 11 and the outer package 12. And the possibility of a short circuit can be suppressed.

  Thirdly, the positive electrode tab 13 indicates that “the length of the outer package 12 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111−the length of the thin plate 17−the distance between the thin plate 17 on the positive electrode terminal 15 side and the unit cell 11. In the direction connecting the positive electrode terminal 15 and the positive electrode plate 111, a length equal to or greater than “the difference” is provided. Further, the negative electrode tab 14 indicates that “the length of the outer package 12 in the direction connecting the negative electrode terminal 16 and the negative electrode plate 112−the length of the thin plate 17−the difference in the distance between the thin plate 17 on the negative electrode terminal 16 side and the unit cell 11. ”In the direction connecting the negative electrode terminal 16 and the negative electrode plate 112.

  Therefore, even if the unit cell 11 moves in the exterior body 12 in the direction connecting the positive electrode terminal 15 and the positive electrode plate 111 or in the direction connecting the negative electrode terminal 16 and the negative electrode plate 112, the positive electrode tab 13 is moved by this movement. The negative electrode tab 14 is not cut. That is, in the battery 1, internal disconnection caused by the movement of the unit cell 11 within the outer package 12 can be prevented.

  Fourth, even when the unit cell 11 moves in the exterior body 12 due to external impact or vibration, the thin plate 17 is worn or damaged when the unit cell 11 contacts the inner surface of the exterior body 12. Can be prevented.

  Fifth, since a space is provided between the unit cell 11 and the exterior body 12, the amount of electrolyte solution retained in the secondary battery 1 is increased, and a longer life of the secondary battery 1 can be expected. it can.

  In addition, about each of a, b, c, d1, d2, e, and f again, a is the length of the long side of the unit cell 11, and b is the length of the thin plate 17. C is the length of the long side of the outer package 12. D1 is the length in the direction connecting the positive electrode terminal 15 of the positive electrode tab 13 and the positive electrode plate 111, and d2 is the length in the direction connecting the negative electrode terminal 16 of the negative electrode tab 14 and the negative electrode plate 112. That's it. Furthermore, e is the magnitude of the difference in length between the long sides of the unit cell 11 and the thin plate 17 on the positive electrode terminal 15 side, and f is the size of the unit cell 11 and the thin plate 17 on the negative electrode terminal 16 side. This is the size of the difference between the lengths of the long sides.

(2) Manufacturing method of secondary battery The secondary battery 1 can be manufactured in the following procedures, for example.

(Positive electrode)
First, the positive electrode active material powder is stirred with a conductive material, a binder, a thickener, and ion-exchanged water to obtain a paste. As the positive electrode active material powder, lithium iron phosphate (LiFePO4) manufactured by Sumitomo Osaka Cement was used. As the conductive material, the trade name “Denka Black” manufactured by Denki Kagaku Kogyo Co., Ltd. was used. Can be made by Daiichi Kogyo Seiyaku.

  Thereafter, the paste was applied on both sides of a rolled aluminum foil (thickness: 20 μm) using a die coater (dry electrode thickness: 290 μm), dried in air at 100 ° C. for 30 minutes, pressed and processed into a positive electrode plate 111. (Coated surface size: 300 mm (vertical) × 150 mm (horizontal), uncoated part: 9 mm (vertical) × 150 mm (horizontal)) is obtained.

(Negative electrode)
First, a negative electrode active material powder made by Hitachi Chemical Co., Ltd. is stirred with a binder made by ZEON, a thickener made by Daicel, and ion-exchanged water to obtain a paste.

  Thereafter, the paste was applied on both sides using a die coater on a rolled copper foil (thickness: 10 μm) (dry electrode thickness: 180 μm), dried in air at 100 ° C. for 30 minutes, and pressed to form a negative electrode plate 112 (coating surface size: 304 mm (vertical) × 154 mm (horizontal), uncoated part: 9 mm (vertical) × 154 mm (horizontal)) is obtained.

(Separator)
As the separator 110, a trade name “Celguard 2500” manufactured by Celgard Inc. can be used.

(Tab part)
An aluminum foil (thickness: 100 μm, width: 30 mm) is cut to a length of 60 mm to form a positive electrode tab 13. A nickel foil (thickness: 100 μm, width: 30 mm) is cut to a length of 60 mm to form a negative electrode tab 14. About each, it processes between the exterior body 12 and the unit cell 11, and it processes into a substantially N shape so that it can expand-contract.

(Thin plate)
As the thin plates 17 and 17 ′ fixed to the unit cell 11, a 1 mm-thick polypropylene plate (hereinafter abbreviated as PP plate) can be used. The thin plates 17 and 17 ′ are respectively installed on the upper surface and the lower surface of the unit cell 11 and fixed to the unit cell 11 using Kapton tape.

(Secondary battery)
The positive electrode plate 111 and the negative electrode plate 112 are dried under reduced pressure at 130 ° C. for 24 hours and placed in a glove box under an argon atmosphere. All battery assembly below is performed at room temperature in the glove box.

  Using nine positive plates 111, ten negative plates 112, and separators 110, as shown in FIG. 1, the separators 110 come to the outermost side, and then the negative plates 112 and the separators 110 are placed further. The unit cell 11 is formed by stacking the positive electrode plates 111 in this order.

  The positive electrode tab 13 made of aluminum is ultrasonically welded to the uncoated portion on the short side of the positive electrode plate 111, and the negative electrode tab 14 made of nickel is ultrasonically welded to the uncoated portion on the short side of the negative electrode plate 112.

  The upper and lower surfaces of the unit cell 11 are sandwiched between the thin plates 17 and 17 ′ so that the center of the thin plates 17 and 17 ′ and the center of the unit cell 11 are aligned, and are fixed by the Kapton tape 18.

  The unit cell 11 to which the thin plate 17 is fixed is inserted into the exterior body 12.

  Thereafter, the ends of the positive electrode tab 13 and the negative electrode tab 14 are welded to the positive electrode terminal 15 and the negative electrode terminal 16 which are attached to the side wall of the outer package body 12 in advance so as to be insulated from the outer package body 12, respectively. The exterior body 12 is sealed with a lid for use.

  Furthermore, an electrolytic solution in which 1 mol of lithium hexafluorophosphate (LiPF6) is dissolved in a solvent in which ethylene carbonate (EC, Ethylene Carbonate) and diethyl carbonate (DEC, Diethyl Carbonate) are mixed at a volume ratio of 1: 2 is prepared. A large-sized storage battery 1 having a capacity of 20 ampere hours as shown in FIG.

(3) Verification Using Comparative Example In order to confirm the impact resistance of the secondary battery 1 according to the present embodiment, the positive electrode terminal 15 and the positive electrode plate 111 are connected to Example 1 and Comparative Examples 1 to 8. An experiment was performed in which an impact was applied from the direction or the direction connecting the negative electrode terminal 16 and the negative electrode plate 112.

  FIG. 3 is a diagram summarizing the sizes of the secondary batteries of Example 1 and Comparative Examples 1 to 8 in which the impact resistance experiment was performed, and FIG. 4 is a table summarizing the results of the impact resistance experiment.

  5-12 is a figure which shows the experimental result of Comparative Examples 1-8, respectively.

  In addition, Example 1 refers to the secondary battery 11, and as is clear from the above description and the results of the impact resistance experiment shown in FIG. 4, Example 1 is an internal disconnection and an internal short circuit. There was no outbreak.

  In Comparative Examples 1 to 8, the long side length b of the thin plate 17, the long side length d1 of the positive electrode tab 13, the long side length d2 of the negative electrode tab 14, the element on the positive electrode terminal 15 side, respectively. At least one of the magnitude e of the long side length difference between the battery 11 and the thin plate 17 and the magnitude f of the long side length difference between the unit cell 11 and the thin plate 17 on the negative electrode terminal 16 side is: The secondary battery is different from the secondary battery 1.

(Content of comparative example)
As shown in FIG. 3, in Comparative Examples 1 to 3, at least one of the positive electrode tab 13 and the negative electrode tab 14 is 20 mm shorter than the case of the secondary battery 1, that is, Example 1, Is the same as that of the first embodiment.

  Therefore, when the unit cell 11 of Comparative Examples 1 to 3 moves to the negative electrode terminal 16 side most in the outer package 12, the distance between the positive electrode plate 111 and the positive electrode terminal 15 is the longest, and the length is “the outer package” 12 long sides—the long side of the thin plate 17 + the difference in the distance between the thin plate 17 on the positive electrode terminal 15 side and the unit cell 11 ”, which is 25 mm.

  Similarly, when the unit cells 11 of Comparative Examples 1 to 3 are moved to the positive electrode terminal 15 side most in the outer package 12, the distance between the negative electrode plate 112 and the negative electrode terminal 16 is farthest and the length is “exterior The long side of the body 12 minus the long side of the thin plate 17 + the distance difference between the thin plate 17 on the negative electrode terminal 16 side and the unit cell 11 ”is 25 mm.

  In the secondary battery of Comparative Example 1, the length of the positive electrode tab 13 that connects the positive electrode plate 111 and the positive electrode terminal 15 and the length of the negative electrode tab 14 that connects the negative electrode plate 112 and the negative electrode terminal 16 are both 20 mm. .

  In the secondary battery of Comparative Example 2, only the positive electrode tab 13 is short, and in the secondary battery of Comparative Example 3, only the negative electrode tab 14 is short.

  As shown in FIG. 5A, in the secondary battery of Comparative Example 1, the positive electrode tab 13 and the negative electrode tab 14 are not cut when the unit cell 11 is located in the center of the outer package 12. There is no problem in the connection between the positive electrode plate 111 and the positive electrode terminal 15 and the connection between the negative electrode plate 112 and the negative electrode terminal 16.

  However, as shown in (B), when the unit cell 11 is displaced in the exterior body 12 toward the positive electrode terminal 15 side, that is, to the left side in the figure, the distance between the negative electrode plate 112 and the negative electrode terminal 16 as described above. Is 25 mm, and the negative electrode tab 14 having a length of 20 mm is cut.

  Similarly, as shown in (C), when the unit cell 11 is shifted to the negative electrode terminal 16 side in the outer package 12, that is, to the right side of the drawing, as described above, the positive electrode plate 111 and the positive electrode terminal 15 The distance is 25 mm, and the positive electrode tab 13 having a length of 20 mm is cut.

  5 to 12, (A), (B), and (C) are respectively “when the unit cell 11 of Comparative Examples 1 to 7 is positioned at the center” of the exterior body 12, and “positive electrode terminal 15. "When shifted to the side (left side of the figure)" and "when shifted to the negative electrode terminal 16 side (right side of the figure)".

  In the secondary battery of Comparative Example 2 in which the length of the positive electrode tab 13 is 20 mm and the negative electrode tab 14 is 60 mm, as shown in FIG. 6, the unit cell 11 is located in the “center” of the outer package 12. ”And“ when shifted to the positive electrode terminal 15 side (left side in the figure) ”.

  However, when “shifted to the negative electrode terminal 16 side (right side in the figure)”, the distance between the positive electrode plate 111 and the positive electrode terminal 15 is 25 mm, and the positive electrode tab 13 having a length of 20 mm is cut.

  Similarly, in the secondary battery of Comparative Example 3 in which the length of the positive electrode tab 13 is 60 mm and the negative electrode tab 14 is 20 mm, the unit cell 11 is placed in the “center” of the outer package 12 as shown in FIG. There is no problem in “when it is positioned” and “when it is shifted to the negative electrode terminal 16 side (right side in the drawing)”.

  However, when “shifted to the positive electrode terminal 15 side (left side in the figure)”, the distance between the negative electrode plate 112 and the negative electrode terminal 16 is 25 mm, and the negative electrode tab 14 having a length of 20 mm is cut.

  In addition, as shown in FIG. 4 that summarizes the results of the impact resistance experiment, the secondary batteries of Comparative Examples 1 to 3 have a thin plate 17 longer than the unit cell 11 in the longitudinal direction of the stacked surface of the unit cell 11. 11, the short circuit accompanying the contact between the unit cell 11 and the exterior body 12 can be prevented.

  Compared with Example 1, Comparative Examples 4 to 7 have a common point that the thin plate 17 is shorter than the unit cell 11 in the longitudinal direction of the laminated surface of the unit cell 11.

  Regarding the difference from Example 1, in Comparative Example 4, the thin plate 17 is shorter than the unit cell 11, in Comparative Example 5, both the positive electrode tab 13 and the negative electrode tab 14 are both shorter, and in Comparative Example 6, only the positive electrode tab 13 is used. In Comparative Example 7, only the negative electrode tab 14 is short.

  Regarding the secondary battery of Comparative Example 4, the positive electrode tab 13 and the negative electrode tab 14 are 60 mm as in the secondary battery 1, and therefore, the unit cell 11 is placed in the “center” of the outer package 12 as shown in FIG. It is not cut off in any of “when it is positioned”, “when it is shifted to the positive electrode terminal 15 side (left side in the figure)”, and “when it is shifted to the negative electrode terminal 16 side (right side in the figure)”.

  However, in the secondary battery of Comparative Example 4, the thin plate 17 is shorter than the unit cell 11 in the longitudinal direction of the stacked surface of the unit cells 11.

  Therefore, in the comparative example 4, when the unit cell 11 moves in the exterior body 12 in the longitudinal direction of the stacked surface of the unit cells 11, the unit cell 11 comes into contact with the inner wall of the exterior unit 12, and a short circuit occurs. did.

  As for the secondary battery of Comparative Example 5, the positive electrode tab 13 and the negative electrode tab 14 are 20 mm as in Comparative Example 1. Therefore, as in the case of the comparative example 1, the secondary battery of the comparative example 5 has the unit cell 11 in the “positive electrode terminal 15 side (left side in the figure)” or “negative electrode terminal 16 side (in the figure) of the outer package 12. When it is shifted to “right side”, the negative electrode tab 14 or the positive electrode tab 13 is cut.

  Further, in the secondary battery of Comparative Example 5, as in Comparative Example 4, the thin plate 17 is shorter than the unit cell 11 in the longitudinal direction of the stacked surface of the unit cells 11.

  Therefore, also in the comparative example 5, when the unit cell 11 moves in the exterior body 12 in the longitudinal direction of the laminated surface of the unit cells 11, the unit cell 11 comes into contact with the inner wall of the exterior unit 12, and a short circuit occurs. Occur.

  In the secondary battery of Comparative Example 6, the length of the positive electrode tab 13 is 20 mm and the length of the negative electrode tab 14 is 60 mm as in the case of Comparative Example 2. Also, as in the case of Comparative Example 4, the thin plate 17 However, the length of the laminated surface of the unit cells 11 is shorter than that of the unit cells 11.

  Accordingly, in the secondary battery of Comparative Example 6, the distance between the positive electrode plate 111 and the positive electrode terminal 15 is 25 mm “when the electrode is shifted to the negative electrode terminal 16 side (right side in the figure)”, and the positive electrode tab 13 having a length of 20 mm is Disconnected.

  Also in Comparative Example 6, when the unit cell 11 moves in the exterior body 12 in the longitudinal direction of the laminated surface of the unit cells 11, the unit cell 11 comes into contact with the inner wall of the exterior body 12, causing a short circuit. Occur.

  In the secondary battery of Comparative Example 7, the length of the positive electrode tab 13 is 60 mm and the length of the negative electrode tab 14 is 20 mm as in the case of Comparative Example 3. Also, as in the case of Comparative Example 4, the thin plate 17 However, the length of the laminated surface of the unit cells 11 is shorter than that of the unit cells 11.

  Therefore, in the secondary battery of Comparative Example 7, the distance between the negative electrode plate 112 and the negative electrode terminal 16 is 25 mm “when the electrode is shifted to the positive electrode terminal 15 side (left side in the figure)”, and the negative electrode tab 14 having a length of 20 mm is Disconnected.

  Also in Comparative Example 7, when the unit cell 11 moves in the exterior body 12 in the longitudinal direction of the laminated surface of the unit cells 11, the unit cell 11 comes into contact with the inner wall of the exterior body 12 and short circuit occurs. Occur.

  In the battery of Comparative Example 8, the thin plate 17 is longer in the longitudinal direction of the laminated surface of the unit cells 11 than the secondary battery 1, and the thin plate 17 and the outer package 12 of Comparative Example 8 are of the laminated surface of the unit cells 11. It is the same length in the longitudinal direction.

  Accordingly, the unit cell 11 fixed to the thin plate 17 does not move in the exterior body 12 in the longitudinal direction of the laminated surface of the unit cell 11, and at least one of the positive electrode tab 13 and the negative electrode tab 14 is cut. In addition, the unit cell 11 did not contact the outer case 12.

  However, when an impact is applied to the battery of Comparative Example 8, the case where the unit cell 11 itself is damaged is observed because the unit cell 11 cannot gently receive the impact by moving in the exterior body 12. It was done. Specifically, a case was observed in which stacking deviation occurred in the unit cell 11 and a short circuit between the positive electrode plate 111 and the negative electrode plate 112 occurred.

[Modification 1]
(4) Summary of Modification The secondary battery 1 has the positive electrode terminal 15 and the negative electrode terminal 16 provided on each of the two parallel surfaces facing the exterior body 12, but the secondary battery according to the present invention is The positive electrode terminal and the negative electrode terminal may be provided on one surface of the exterior body.

  In a lithium ion secondary battery 2 according to another embodiment of the present invention, a positive electrode terminal 15 and a negative electrode terminal 16 are provided on the same side wall of the outer package 12.

  FIG. 13 is a cross-sectional view showing the structure of the secondary battery 2 cut along the cell stacking direction, and FIG. 14 shows the structure of the secondary battery 2 when looking down from the cell stacking direction. FIG.

  In FIG. 13, the positive electrode terminal 15 and the negative electrode terminal are depicted as if standing in a vertical relationship, but in reality, the positive electrode terminal 15 and the negative electrode terminal may be at the same height. For the sake of illustration, there is merely a difference between the upper and lower sides.

  In FIG. 14, the positive electrode plate 111 and the negative electrode plate 112 seem to be juxtaposed on the same plane, but in actuality, the positive electrode plate 111 and the negative electrode plate 112 have a laminated structure with a separator interposed therebetween. Is made.

  As shown in FIG. 13 and FIG. 14, the secondary battery 2 is provided with a positive electrode terminal 15 and a negative electrode terminal 16 on one side wall of the exterior body 12. There is no difference.

[Modification 2]
(5) Overview of Modification FIG. 15 is a cross-sectional view taken along the stacking direction of the unit cells, showing the structure of a lithium ion secondary battery 3 according to still another embodiment of the present invention. These are schematic diagrams when looking down from the stacking direction of the unit cells, showing the structure of the secondary battery 3.

  The secondary battery 3 includes a resin stopper (movement control body) 19 in the exterior body 12 in place of the thin plate 17 in order to control the movement of the unit cell 11 in the exterior body 12.

  The distance g between the stopper 19 and the side wall of the exterior body 12 where the positive electrode terminal 15 is disposed is 5 mm, and the distance h between the stopper 19 and the side wall of the exterior body 12 where the negative electrode terminal 16 is disposed is 5 mm. is there.

  The size of the unit cell 11 and the outer package 12 is the same as that of the secondary battery 1. That is, in the longitudinal direction of the stacked surface of the unit cells 11, the length c of the outer package 12 is 375 mm, and the length b of the unit cells 11 is 335 mm.

  Therefore, with respect to the longitudinal direction of the laminated surface of the unit cells 11, “the length c of the outer package 12−the length b of the unit cell 11−the stopper 19 on the positive electrode terminal 15 side and the outer package 12 on which the positive electrode terminal 15 is arranged. The distance “g” between the side walls is 35 mm.

  That is, when the unit cell 11 moves to the most negative electrode terminal 16 side in the exterior body 12, the distance between the positive electrode terminal 15 and the positive electrode plate 111 becomes the maximum and becomes 35 mm.

  Similarly, with respect to the longitudinal direction of the laminated surface of the unit cells 11, “the length c of the outer package 12−the length b of the unit cell 11−the stopper 19 on the negative electrode terminal 16 side and the negative electrode terminal 16 are arranged. The distance “g” between the side wall and the side wall is 35 mm.

  That is, when the unit cell 11 moves to the positive electrode terminal 15 side most in the exterior body 12, the distance between the negative electrode terminal 16 and the negative electrode plate 112 becomes the maximum, and becomes 35 mm.

  The positive electrode tab 13 and the negative electrode tab 14 are arranged in the longitudinal direction of the laminated surface of the unit cells 11 so that the unit cell 11 is not cut even if it moves in the outer body 12 in the longitudinal direction of the laminated surface of the unit cells 11. , 60 mm in length.

(6) Verification of Modification In order to confirm the impact resistance of the secondary battery 3, the same as in the impact resistance experiment, that is, the direction connecting the positive electrode terminal 15 and the positive electrode plate 111, or the negative electrode terminal 16 and the negative electrode plate 112, An experiment was conducted in which an impact from the direction connecting the secondary battery 3 and the secondary battery 3 was applied to a similar battery.

  FIG. 17 is a diagram in which the sizes of the secondary batteries used in the experiment are arranged, and Example 2 indicates the secondary battery 3. Comparative Example 9 is a secondary battery in which only the size of the positive electrode tab 13 and the negative electrode tab 14 of the secondary battery 3 is changed to 30 mm.

  FIG. 18 is a table summarizing the results of the impact resistance experiment.

  FIG. 19 is a diagram showing an experimental result of Example 2, that is, the secondary battery 3, and FIG. 20 is a diagram showing an experimental result of Comparative Example 9.

  As described above, the positive electrode tab 13 has a length of 60 mm in the longitudinal direction of the laminated surface of the unit cells 11, and the distance between the positive electrode terminal 15 and the positive electrode plate 111 is 35 mm at the maximum.

  Accordingly, as shown in FIG. 19, the positive electrode tab 13 is not cut by the movement of the unit cell 11 in the exterior body 12.

  Similarly, the negative electrode tab 14 has a length of 60 mm in the longitudinal direction of the laminated surface of the unit cells 11, and the distance between the negative electrode terminal 16 and the negative electrode plate 112 is 35 mm at the maximum. The negative electrode tab 14 is not cut by the movement in the outer package 12.

  Moreover, the unit cell 11 and the exterior body 12 are not brought into contact with each other by the stopper 19 existing between the unit cell 11 and the exterior body 12 in the longitudinal direction of the laminated surface of the unit cells 11.

  Regarding the battery of Example 9, the positive electrode tab 13 has a length of 30 mm in the longitudinal direction of the laminated surface of the unit cells 11, and the distance between the positive electrode terminal 15 and the positive electrode plate 111 is 35 mm at the maximum.

  Similarly, the negative electrode tab 14 has a length of 30 mm in the longitudinal direction of the laminated surface of the unit cells 11, and the distance between the negative electrode terminal 16 and the negative electrode plate 112 is 35 mm at the maximum.

  Accordingly, as shown in FIG. 20, when the unit cell 11 moves in the outer package 12 to the negative electrode terminal 16 side, the positive electrode tab 13 is cut, and the unit cell 11 moves in the package body 12 to the positive electrode terminal 15 side. Thus, the negative electrode tab 14 is cut.

  However, the unit cell 11 and the exterior body 12 are not brought into contact with each other by the stopper 19 existing between the unit cell 11 and the exterior body 12 in the longitudinal direction of the laminated surface of the unit cells 11.

  Regarding the secondary batteries 1 and 2, the thin plates 17 and 17 ′ have been fixed to both the upper surface and the lower surface of the unit cell 11, but the movement of the unit cell 11 within the exterior body 12 is controlled by the thin plate 17. The thin plate 17 may be fixed to only one of the upper surface and the lower surface of the unit cell 11 and the thin plate 17 ′ may not be fixed.

  Similarly, the thin plates 17 and 17 ′ fixed to the upper surface and the lower surface of the unit cell 11 may have the same size. In that case, the thin plates 17 and 17 ′ control the movement of the unit cells in the exterior body 12.

  Further, the thin plate 17 may be made of a hard and light material from the viewpoint of energy efficiency, and is not limited to the PP plate. Further, since the insulation between the unit cell 11 and the outer case 12 has already been ensured by the separator 110, the insulation of the thin plate 17 is not an essential property. However, the thin plate 17 may have insulating properties.

  Similarly to the thin plate 17, the stopper 19 does not need to be fixed to both the upper surface and the lower surface of the exterior body 12, and may be fixed to only one of the surfaces. Further, the stopper 19 fixed to the upper surface and the stopper 19 fixed to the lower surface must be separated from the side wall provided with the positive electrode terminal 15 and the side wall provided with the negative electrode terminal 16 at the same distance. Not a translation.

  Specific examples of the secondary battery according to the present invention described above are summarized below.

  A battery according to the present invention includes a unit cell having a laminated structure composed of a positive electrode plate and a negative electrode plate facing each other with a separator interposed therebetween, a thin plate as a movement control body fixed to a laminated surface of the unit cell, and the unit cell and the thin plate. A housing for housing, a positive electrode terminal and a negative electrode terminal provided on each of two parallel wall surfaces of the outer package, and a positive electrode for electrically connecting the positive electrode plate and the negative electrode plate of the unit cell to the positive electrode terminal and the negative electrode terminal, respectively. The two parallel wall surfaces of the exterior body including the tab and the negative electrode tab and provided with the positive electrode terminal and the negative electrode terminal are not parallel to the laminated surface of the unit cells, but in the direction perpendicular to the wall surface, Is longer on both sides of the positive electrode terminal side and the negative electrode terminal side, and further, the thin plate is shorter than the exterior body, and in the direction orthogonal to the wall surface, the positive electrode tab is in the direction orthogonal to the wall surface Length of + In the direction perpendicular to the wall surface, the negative electrode tab has a length equal to or greater than the “distance between the thin plate and the unit cell on the electrode terminal side”. It may have a length equal to or more than the “distance between the thin plate and the unit cell on the negative electrode terminal side”.

  A battery according to the present invention includes a unit cell having a laminated structure composed of a positive electrode plate and a negative electrode plate facing each other with a separator interposed therebetween, a thin plate as a movement control body fixed to a laminated surface of the unit cell, and the unit cell and the thin plate. An exterior body for housing, a positive electrode terminal and a negative electrode terminal, and a positive electrode tab and a negative electrode tab that electrically connect the positive electrode plate and the negative electrode plate to the positive electrode terminal and the negative electrode terminal, respectively. The wall surface is provided on one of the exterior bodies that is not parallel to the laminated surface, and in the direction perpendicular to the wall surface, the thin plate is closer to the other wall surface side of the exterior body than the unit cell. In the direction perpendicular to the wall surface, the positive electrode tab and the negative electrode tab are in the direction orthogonal to the wall surface “length of the outer body−length of the thin plate + on the wall surface side. Thin plate and element It may have a length of distance "or between.

  The battery according to the present invention includes a unit cell having a laminated structure composed of a positive electrode plate and a negative electrode plate that are opposed to each other with a separator interposed therebetween, an exterior body that accommodates the unit cell, and a surface of the exterior body that is parallel to the stack surface of the unit cells A stopper fixed as a movement control body on the inside of the casing, a positive terminal and a negative terminal provided on each of two parallel wall surfaces of the exterior body, and a positive plate and a negative plate electrically connected to the positive terminal and the negative terminal, respectively. The two parallel wall surfaces of the outer package including the positive electrode tab and the negative electrode tab connected to each other, the positive electrode terminal and the negative electrode terminal being provided, are not parallel to the stacked surface of the unit cell, and the stopper is provided with the positive electrode terminal Are fixed between the inside of the wall surface and the unit cell, and between the inside of the wall surface where the negative electrode terminal is provided and the unit cell, and in the direction orthogonal to the wall surface, the positive electrode tab is orthogonal to the wall surface. Direction of "outside" The length of the body-the length of the unit cell-the length between the stopper on the negative electrode side and the wall surface on which the negative electrode terminal is provided is equal to or greater than the length of the stopper, and in the direction perpendicular to the wall surface, The negative electrode tab has a length equal to or greater than the “exterior body length−the length of the unit cell−the distance between the stopper on the positive electrode side and the wall surface on which the negative electrode terminal is provided” in the direction perpendicular to the wall surface. It may have a thickness.

  A battery according to the present invention includes a unit cell having a laminated structure composed of a positive electrode plate and a negative electrode plate that are opposed to each other with a separator interposed therebetween, an exterior body that accommodates the unit cell, and a surface of the exterior body that is parallel to the laminate surface of the unit cell A positive electrode terminal and a negative electrode terminal, and a positive electrode tab and a negative electrode tab that electrically connect the positive electrode plate and the negative electrode plate to the positive electrode terminal and the negative electrode terminal, respectively. And the negative electrode terminal is not parallel to the laminated surface of the unit cells, and a wall surface is provided on one of the exterior bodies, and the stopper is provided between the inside of the wall surface on which the positive electrode terminal and the negative electrode terminal are provided and the unit cell. And is fixed between the inside of the other wall surface of the exterior body and the unit cell, and is parallel to the wall surface on which the positive electrode terminal and the negative electrode terminal are provided, and on the wall surface on which the positive electrode terminal and the negative electrode terminal are provided. Orthogonal The positive electrode tab and the negative electrode tab are provided in the direction orthogonal to the wall surface on which the positive electrode terminal and the negative electrode terminal are provided. It may have a length equal to or greater than the “distance between the stopper on the wall surface side and the wall surface”.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention realizes a battery that prevents disconnection between an input / output terminal and a unit cell, and also prevents an internal short circuit due to contact between the unit cell and an exterior body. Therefore, the present invention can be widely used for all batteries. In particular, it can be suitably used for a large-sized lithium ion secondary battery using a metal can as an exterior body.

DESCRIPTION OF SYMBOLS 1 Battery 11 Unit cell 12 Exterior body 13 Positive electrode tab (electrode tab)
14 Negative electrode tab (electrode tab)
15 Positive terminal (electrode terminal)
16 Negative terminal (electrode terminal)
17 Thin plate (movement control body)
19 Stopper (movement control body)
110 Separator 111 Positive electrode plate (electrode plate)
112 Negative electrode plate (electrode plate)

Claims (6)

A unit cell in which positive and negative electrode plates are stacked with a separator interposed therebetween is accommodated in an exterior body so as to be movable along one axis, and is provided on the inner wall of the exterior body where the unit cell is separated from and connected by the movement. A battery in which the electrode terminal and the electrode plate are electrically connected by an electrode tab,
Even when the unit cell is closest to the inner wall of the exterior body by the movement, the unit cell is held at a position where the unit cell is not in contact with the inner wall of the exterior body. A battery comprising a movement control body that holds the unit cell at a position where electrical connection by the electrode tab can be maintained even in a state of being most separated from an inner wall of the body.   The battery according to claim 1, wherein the movement control body is fixed to the unit cell and moves in the exterior body together with the unit cell.   The battery according to claim 1, wherein the movement control body is fixed to the exterior body.   4. The electrode terminal according to claim 1, wherein the positive electrode and the negative electrode are respectively disposed on one of the opposing inner walls of the exterior body where the unit cell is separated from the moving body by the movement. 5. The battery according to item 1.   4. The electrode terminal according to claim 1, wherein both of the positive electrode and the negative electrode are disposed on one of the opposing inner walls of the outer package, to which the unit cell is separated from and coming into contact with the movement. 5. The battery according to item 1.   The battery according to claim 1, wherein the exterior body is made of metal.

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