JP6569276B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including an electrode laminate in which a plurality of positive electrode sheets, negative electrode sheets, and separators are laminated.

As this type of power storage device, there is a secondary battery (see, for example, Patent Document 1).
Conventionally, there is a secondary battery as shown in FIG.
As shown in FIG. 17, the secondary battery includes an electrode stack 150 in which a plurality of positive electrode sheets 160, negative electrode sheets 170, and separators 180 are stacked. The positive electrode sheet 160 includes a base material 163 made of an aluminum foil, and an active material layer 164 attached to both surfaces of the base material 163. The negative electrode sheet 170 includes a base material 173 made of copper foil and an active material layer 174 that is attached to both surfaces of the base material 173.

  The portions of the electrode sheets 160 and 170 to which the active material layers 164 and 174 are attached are arranged facing the other electrode sheets 170 and 160 in the stacking direction, and function as the electromotive portions 161 and 171. The portions of the electrode sheets 160 and 170 where the active material layers 164 and 174 are not deposited are respectively laminated on electrode lead bodies (not shown) and function as current collectors 162 and 172. Each current collector 162, 172 is fixed to the electrode lead body by rivets 136, 146 and the like.

  The electrode laminate 150 is accommodated in a case (not shown) together with the electrolytic solution. In addition, an electrode terminal protruding outside the case is connected to one end of each electrode lead body.

JP 2008-130360 A

  By the way, the present inventor has developed a secondary battery described below. That is, in the secondary battery, a member corresponding to a conventional pair of electrode lead bodies and a member corresponding to a pair of electrode terminals are integrally formed, and these are integrated (hereinafter referred to as electrode terminals). Is inserted into a pair of insertion holes formed in the peripheral wall of the case and assembled. Then, a plurality of electrode sheets are laminated on a portion of the electrode terminal located inside the case.

  However, in such a secondary battery, both surfaces of each of the electrode sheets 160 and 170 and the separator 180 are not actually perfect planes, so that the electrode stack 150 swells in the stacking direction as shown in FIG. . Therefore, in order to accommodate the electrode laminate 150 inside the case, a process of pressing the electrode laminate 150 toward the laminate surfaces 301 and 401 of the electrode terminals 130 and 140 is required. At this time, the electrode sheets 160 and 170 are easily bent along the corner portions 302 and 402 connected to the laminated surfaces 301 and 401 of the electrode terminals 130 and 140. For this reason, the electrode sheets 160 and 170 are easily broken, and the yield of the secondary battery is deteriorated.

  The objective of this invention is providing the electrical storage apparatus which can suppress that a tear arises in an electrode sheet.

  A power storage device for achieving the above object is inserted into a case having an annular peripheral wall formed with a pair of insertion holes, a pair of covers provided in both openings of the case, and the pair of insertion holes, respectively. Positive electrode terminals and negative electrode terminals having laminated surfaces, a plurality of positive electrode sheets laminated on the laminated surface of the positive electrode terminals, a plurality of negative electrode sheets laminated on the laminated surface of the negative electrode terminals And an electrode laminate having a separator located between the positive electrode sheet and the negative electrode sheet and insulating the positive electrode sheet and the negative electrode sheet, and the case includes the laminated surface The electrode sheet laminated on the electrode terminal is pressed against the laminated surface of the electrode terminal, and a suppressing portion for suppressing the electrode sheet from being bent and deformed is provided side by side with the electrode terminal.

  According to the same configuration, since the case is provided with the suppressing portion along with the electrode terminal, the electrode sheet laminated on the laminated surface of the electrode terminal is pressed against the laminated surface. It is possible to suppress the electrode sheet from being bent and deformed. For this reason, it can suppress that a tear arises in an electrode sheet.

  According to this invention, it can suppress that a tear arises in an electrode sheet.

The perspective view of the secondary battery with which the electrical storage apparatus was actualized about one Embodiment of an electrical storage apparatus. The disassembled perspective view of the secondary battery in the same embodiment. The disassembled perspective view of the electrode laminated body in the embodiment. The top view in the state where the cover is removed about the secondary battery in the embodiment. Sectional drawing along line 5-5 in FIG. The top view of the case of the embodiment. Sectional drawing along line 7-7 in FIG. Sectional drawing along line 8-8 in FIG. It is sectional drawing corresponding to FIG. 7, Comprising: Sectional drawing which shows the state by which the electrode terminal was assembled | attached with respect to the case. It is sectional drawing corresponding to FIG. 8, Comprising: Sectional drawing which shows the state by which the electrode terminal was assembled | attached with respect to the case. It is sectional drawing corresponding to FIG. 8, Comprising: Sectional drawing which shows the state in which the limitation pin and the rivet were assembled | attached with respect to the case. Sectional drawing which shows the state by which the electrode laminated body is pressed in the lamination direction about the secondary battery of the embodiment. Sectional drawing which expands and shows a part of FIG. It is sectional drawing corresponding to FIG. 8, Comprising: Sectional drawing which shows the state by which the pressing member was assembled | attached with respect to the case. It is sectional drawing corresponding to FIG. 8, Comprising: Sectional drawing which shows the state by which the head of the rivet was crimped. Sectional drawing centering on the suppression part of a modification. The disassembled perspective view of the electrode laminated body of the secondary battery which this inventor developed. Sectional drawing which shows the state by which the electrode laminated body is pressed in the lamination direction about the said secondary battery.

Hereinafter, an embodiment in which the power storage device is embodied as a lithium ion secondary battery (hereinafter simply referred to as a secondary battery 10) will be described with reference to FIGS.
As shown in FIGS. 1, 2, 4, and 6, the case 20 of the secondary battery 10 has a long square annular peripheral wall 21 formed of an insulating resin material. Hereinafter, a direction along the long side of the peripheral wall 21 is referred to as a longitudinal direction L, and a direction along the short side is referred to as a short direction S.

  As shown in FIGS. 1 and 2, a plurality of lightening portions 213 are formed on the outer peripheral surface of the peripheral wall 21 at intervals in the circumferential direction. A pair of insertion holes 22 penetrating through the peripheral wall 21 are formed in the peripheral wall 21 along the longitudinal direction L so as to be separated from each other. Further, four injection holes 24 penetrating through the peripheral wall 21 are formed in the peripheral wall 21 along the longitudinal direction L. 1 and 2, only two injection holes 24 are shown. A screw 13 is screwed into each injection hole 24.

One of the pair of insertion holes 22 is inserted with a columnar positive electrode terminal 30 made of aluminum, and the other is inserted with a columnar negative electrode terminal 40 made of copper.
The positive electrode terminal 30 and its surrounding structure and the negative electrode terminal 40 and its surrounding structure are in a mirror image relationship with each other. Therefore, hereinafter, the positive electrode terminal 30 and its peripheral structure will be described, and the description of the negative electrode terminal 40 and its peripheral structure will be omitted. For each configuration of the negative electrode terminal 40, a code (“4 *”) obtained by adding “10” to a code (“3 *”) of each configuration of the positive electrode terminal 30, or “3 **” "Is added with a sign (" 4 ** ") obtained by adding" 100 ".

As shown in FIGS. 2, 4, and 5, the positive electrode terminal 30 extends along the short-side direction S, and a tip portion thereof protrudes outside the case 20.
As shown in FIGS. 2 and 5, the portion including the proximal end portion of the positive electrode terminal 30 has a half-cracked columnar shape and has a planar laminated surface 301. As shown in FIG. 5, a ring groove 33 is formed on the outer peripheral surface of the positive electrode terminal 30, and an O-ring 37 made of a corrosion-resistant rubber material is fitted on the ring groove 33. The O-ring 37 is compressed and contacts the inner peripheral surface of the insertion hole 22 of the case 20.

  As shown in FIGS. 2 and 4 to 8, a support portion 23 that supports the base end portion of the positive electrode terminal 30 is integrally formed at a corner portion of the case 20 that is positioned forward of the positive electrode terminal 30 in the insertion direction. ing.

As shown in FIGS. 5 and 8, a hole 32 and a support hole 231 are formed in the base end portion of the positive electrode terminal 30 and the support portion 23, respectively.
A restriction pin 38 is inserted into the hole 32 and the support hole 231 from above in the figure. As shown in FIG. 10, the regulation pin 38 has a shaft portion 381 inserted through the hole 32 and the support hole 231, and a rectangular parallelepiped base portion 382 formed integrally with the base end of the shaft portion 381. The restriction pin 38 restricts the displacement of the positive electrode terminal 30 with respect to the support portion 23.

As shown in FIGS. 2, 4, and 5, the electrode stack 50 is accommodated in the case 20 together with the electrolytic solution.
As shown in FIGS. 2 and 3, the electrode stack 50 includes a plurality of positive electrode sheets 60 stacked on the stack surface 301 of the positive electrode terminal 30 and a plurality of sheets stacked on the stack surface 401 of the negative electrode terminal 40. Negative electrode sheet 70, and a separator 80 that is located between the positive electrode sheet 60 and the negative electrode sheet 70 and that insulates the positive electrode sheet 60 and the negative electrode sheet 70 from each other. One separator 80 is interposed between one positive electrode sheet 60 and one negative electrode sheet 70. In FIG. 2, one positive electrode sheet 60, one negative electrode sheet 70, and one separator 80 are shown.

  The positive electrode sheet 60 includes, for example, a base material 63 made of an aluminum foil having a thickness of about 20 μm, and an active material layer 64 made of a well-known material attached to both surfaces of the base material 63. In addition, as a material of the active material layer 64, lithium cobaltate etc. are mentioned, for example. The portion of the positive electrode sheet 60 on which the active material layer 64 is deposited is disposed to face the negative electrode sheet 70 in the stacking direction and functions as the electromotive unit 61. The portion of the positive electrode sheet 60 where the active material layer 64 is not deposited is laminated on the laminated surface 301 of the positive electrode terminal 30 and functions as the current collector 62. In the current collector 62, a pair of long holes 65 that are long in the longitudinal direction L are formed apart from each other in the short direction S.

  The negative electrode sheet 70 includes a base material 73 made of, for example, a copper foil having a thickness of about 10 μm, and an active material layer 74 made of a well-known material deposited on both surfaces of the base material 73. In addition, as a material of the active material layer 74, a carbon material etc. are mentioned, for example. A portion of the negative electrode sheet 70 on which the active material layer 74 is deposited is disposed to face the positive electrode sheet 60 in the stacking direction, and functions as the electromotive unit 71. Further, the portion of the negative electrode sheet 70 where the active material layer 74 is not deposited is laminated on the laminated surface 401 of the negative electrode terminal 40 and functions as the current collector 72. In the current collector 72, a pair of long holes 75 that are long in the longitudinal direction L are formed apart from each other in the lateral direction S.

The separator 80 is a non-woven fabric formed of an insulating resin material, and is interposed between one positive electrode sheet 60 and one negative electrode sheet 70.
As shown in FIG. 2, the current collector 62 of each positive electrode sheet 60 is sandwiched between the laminated surface 301 of the positive electrode terminals 30 and the lower surface of the presser member 34 having a half cracked columnar shape. As shown in FIGS. 2 and 5, the positive electrode terminal 30, the positive electrode are formed by a hole 31 of the positive electrode terminal 30, a long hole 65 of the positive electrode sheet 60, and a rivet 36 inserted through the hole 35 of the pressing member 34. The sheet 60 and the pressing member 34 are fastened to each other.

  As shown in FIGS. 2, 4, 6 and 8, positioning protrusions 25 are formed on the inner peripheral surface of the peripheral wall 21. The positive electrode sheet 60 is positioned with respect to the case 20 by extrapolating the recess 66 formed in the positive electrode sheet 60 with respect to the positioning protrusion 25.

  As shown in FIG. 2, the current collector 72 of each negative electrode sheet 70 is sandwiched between the laminated surface 401 of the negative electrode terminal 40 and the lower surface of the presser member 44 having a half cracked columnar shape. The negative electrode terminal 40, the negative electrode sheet 70, and the pressing member 44 are fastened to each other by the rivet 46 inserted through the hole 41 of the negative electrode terminal 40, the long hole 75 of the negative electrode sheet 70, and the hole 45 of the pressing member 44. Has been.

  As shown in FIGS. 2, 4, 6 and 8, positioning protrusions 26 are formed on the inner peripheral surface of the peripheral wall 21. The recess 76 formed in the negative electrode sheet 70 is extrapolated with respect to the positioning protrusion 26, whereby the negative electrode sheet 70 is positioned with respect to the case 20.

  As shown in FIG. 2, a pair of suppressing portions 29 are integrally formed on the inner peripheral surface along the longitudinal direction L of the peripheral wall 21. The pair of suppressing portions 29 has a flat plate shape extending along the short direction S and is aligned with the electrode terminals 30 and 40 in the longitudinal direction L.

  As shown in FIGS. 2, 6, and 7, both ends of the suppressing portion 29 are fixed to the inner peripheral surfaces of the peripheral walls 21 that face each other. As shown in FIG. 6, one end portion (upper end portion in the figure) of the suppressing portion 29 is also fixed to the support portion 23.

  The suppression unit 29 has a facing surface 291 that faces the electrode sheets 60 and 70. As shown in FIG. 7, the facing surface 291 is further away from the laminated surfaces 301 and 401 in the laminating direction as it is farther from the electrode terminals 30 and 40 in the longitudinal direction L, that is, closer to the intermediate position in the left-right direction in FIG. Thus, the inclined surface is inclined with respect to the laminated surfaces 301 and 401. As shown in FIGS. 12 and 13, in this embodiment, the inclination angle α of the facing surface 291 with respect to the stacked surfaces 301 and 401 is set to 45 degrees.

  As shown in FIGS. 2 and 4 to 7, long square annular double grooves 211 and 212 are formed on the upper surface and the lower surface of the peripheral wall 21, respectively. As shown in FIG. 5, a sealing agent 93 is applied to the outer circumferential groove 211.

  As shown in FIGS. 2 and 5, covers 91 and 92 made of aluminum plates are provided at upper and lower openings of the peripheral wall 21. That is, as shown in FIG. 2, the covers 91 and 92 are fastened to the peripheral wall 21 by the rivets 11 and 12 inserted through the holes 911 and 921 of the covers 91 and 92 and the holes 27 and 28 of the peripheral wall 21, respectively.

  As shown in FIG. 5, the clearance between the top surface of the regulation pin 38 and the lower surface of the cover 91 facing the top surface is prevented by the cover 91 from coming out of the support hole 231 and the hole 32. The size is assumed.

  As shown by a two-dot chain line in FIG. 4, an insulating sheet 81 made of an insulating resin material is interposed between the electrode laminate 50 and the cover 91. A similar insulating sheet (not shown) is interposed between the electrode laminate 50 and the cover 92. In addition, illustration of these insulating sheets 81 is abbreviate | omitted in FIG.

Next, a procedure for assembling the secondary battery 10 of this embodiment will be described.
As shown in FIGS. 9 and 10, first, the positive electrode terminal 30 and the negative electrode terminal 40 in a state where the O-ring 37 is externally fitted in the ring groove 33 are respectively inserted into the insertion holes 22 from the outside of the case 20. The lower surfaces of the base end portions of the terminals 30 and 40 are brought into contact with the upper surface of the support portion 23, respectively. Subsequently, as shown in FIG. 10, the regulation pin 38 is inserted into the hole 32 of the positive electrode terminal 30 and the support hole 231 of the support portion 23 from above. The same operation is performed on the negative electrode terminal 40 side.

  Subsequently, as shown in FIG. 11, the rivet 36 is inserted from below into the hole 31 of the positive electrode terminal 30, and the lower end of the rivet 36 is supported from below by the lower jig 101 indicated by a two-dot chain line.

  Subsequently, as shown in FIGS. 2 and 3, the long hole 65 of the positive electrode sheet 60 is extrapolated to the rivet 36, and the positive electrode sheet 60 is placed on the laminated surface 301 of the positive electrode terminal 30. Subsequently, the separator 80 is placed on the electromotive unit 61 of the positive electrode sheet 60.

  Subsequently, the long hole 75 of the negative electrode sheet 70 is extrapolated to the rivet 46 of the negative electrode terminal 40, and the negative electrode sheet 70 is placed on the laminated surface 401 of the negative electrode terminal 40. Subsequently, the separator 80 is placed on the electromotive portion 71 of the negative electrode sheet 70.

  By repeating these operations, the positive electrode sheet 60 and the negative electrode sheet 70 are laminated on the laminated surface 301 of the positive electrode terminal 30 and the laminated surface 401 of the negative electrode terminal 40, respectively.

  Subsequently, as shown in FIG. 12, the electrode laminated body 50 including the laminated electrode sheets 60 and 70 and the separator 80 is pressed by the upper jig 102 from above toward the laminated surfaces 301 and 401 of the electrode terminals 30 and 40. wear.

Subsequently, as shown in FIG. 14, the hole 35 of the pressing member 34 is extrapolated to the rivet 36.
Subsequently, as shown in FIG. 15, the positive electrode terminal 30, the electrode laminate 50, and the pressing member 34 are fastened by the rivet 36 by crimping the tip of the rivet 36. Similarly, the negative electrode terminal 40, the electrode laminate 50, and the pressing member 44 are fastened by rivets 46 (not shown).

  Subsequently, as shown in FIG. 5, a sealant 93 is applied to the groove 211 on the upper surface of the peripheral wall 21 of the case 20, and the cover 91 is brought into contact with the upper surface of the peripheral wall 21. Subsequently, as shown in FIG. 2, the cover 91 is fixed to the case 20 by inserting the rivet 11 into the holes 27 and 911 of the case 20 and the cover 91 and caulking the tip of the rivet 11. Further, the cover 92 is fixed to the case 20 by the rivet 12 by performing the same operation on the lower surface of the peripheral wall 21 of the case 20 as the upper surface. In FIG. 2, the rivets 11 and 12 are shown with both ends crimped.

Then, an electrolytic solution is injected into the case 20 through each injection hole 24, and the screw 13 is screwed into the injection hole 24 to close the injection hole 24.
Next, the operation of this embodiment will be described.

  As described above, when the secondary battery 10 is assembled, as shown in FIG. 12, the electrode stack 50 including the stacked electrode sheets 60 and 70 and the separator 80 is stacked on the stacked surfaces 301 and 401 of the electrode terminals 30 and 40. Is pressed by the upper jig 102.

  At this time, since the suppression portion 29 is provided along with the electrode terminals 30 and 40 in the case 20, the electrode sheets 60 and 70 are curved between the laminated surfaces 301 and 401 and the suppression portion 29. For this reason, it can suppress that the electrode sheets 60 and 70 are bent and deformed.

According to the power storage device according to the present embodiment described above, the following effects can be obtained.
(1) In the case 20, the electrode sheets 60 and 70 laminated on the laminated surfaces 301 and 401 are pressed against the laminated surfaces 301 and 401 of the electrode terminals 30 and 40. A restraining portion 29 that suppresses the 70 from being bent and deformed is provided along with the electrode terminals 30 and 40.

  According to such a configuration, since the suppression portion 29 is provided along with the electrode terminals 30 and 40 on the inner peripheral surface of the peripheral wall 21 of the case 20, the suppression portions 29 are stacked on the stacked surfaces 301 and 401 of the electrode terminals 30 and 40. It is possible to prevent the electrode sheets 60 and 70 from being bent and deformed due to the electrode sheets 60 and 70 being pressed toward the laminated surfaces 301 and 401. For this reason, it can suppress that a tear arises in the electrode sheets 60 and 70. FIG. Therefore, the yield of the secondary battery 10 can be improved.

  (2) The suppression unit 29 has a facing surface 291 that faces the electrode sheets 60 and 70, and the facing surface 291 is separated from the electrode terminals 30 and 40 in the arrangement direction of the electrode terminals 30 and 40 and the suppression unit 29. The electrode sheets 60 and 70 are separated from the lamination surfaces 301 and 401 in the lamination direction.

  According to such a configuration, when the electrode sheets 60 and 70 laminated on the laminated surfaces 301 and 401 of the electrode terminals 30 and 40 are pressed toward the laminated surfaces 301 and 401, the electrode sheets 60 and 70 are bent and deformed. Can be prevented appropriately.

  (3) Since the opposing surface 291 is an inclined surface inclined with respect to the stacked surfaces 301 and 401, the opposing surface 291 has no irregularities. Accordingly, it is possible to appropriately prevent the electrode sheets 60 and 70 from being deformed by the facing surface 291 of the suppressing portion 29 itself.

  (4) Since the suppressing portion 29 has a flat plate shape, the thickness of the suppressing portion 29 can be easily reduced. For this reason, the weight increase of the case 20 accompanying the addition of the suppression part 29 can be suppressed, and by extension, the weight increase of the secondary battery 10 can be suppressed.

(5) Both ends of the suppressing portion 29 are fixed to a pair of inner peripheral surfaces of the peripheral wall 21 that face each other.
According to such a configuration, the suppressing portion 29 is provided side by side on the stacked surfaces 301 and 401 over the entire longitudinal direction L. For this reason, the bending deformation of the electrode sheets 60 and 70 can be suppressed over the entire longitudinal direction L.

  Moreover, since both ends of the suppression part 29 are being fixed to the inner peripheral surface of the surrounding wall 21, the rigidity of the suppression part 29 can be improved. Thereby, since it becomes possible to make the width | variety of the control part 29 in the transversal direction S small, the space which the electromotive parts 61 and 71 of the electrode sheets 60 and 70 occupy is restricted by adding the control part 29. It can suppress receiving. Therefore, a decrease in volume energy density, which is the capacity of the secondary battery 10 per unit volume, can be suppressed.

(6) A support portion 23 that supports the ends of the electrode terminals 30 and 40 is formed on the inner peripheral surface of the peripheral wall 21, and the suppression portion 29 is fixed to the support portion 23.
According to such a configuration, the peripheral surfaces of the electrode terminals 30 and 40 are supported by the inner peripheral surface of the insertion hole 22 formed in the peripheral wall 21, and the base end portions of the electrode terminals 30 and 40 are the inner peripheral surface of the peripheral wall 21. It is supported by the support part 23 formed in the above. For this reason, the electrode terminals 30 and 40 can be supported stably.

Moreover, since the one end part of the suppression part 29 is being fixed to both the internal peripheral surface of the surrounding wall 21, and the support part 23, the rigidity of the suppression part 29 can be improved further.
(7) Since the peripheral wall 21 and the suppression part 29 are integrally molded by the resin material, the peripheral wall 21 and the suppression part 29 can be formed at once by resin molding, and the case 20 can be formed easily. .

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
-The inclination | tilt angle (alpha) of the opposing surface 291 of the control part 29 with respect to the lamination | stacking surfaces 301 and 401 of the electrode terminals 30 and 40 can also be made larger than 45 degree | times. Further, the inclination angle α can be made smaller than 45 degrees.

  The peripheral wall 21 of the case 20 can be changed to a long rectangular ring that is long in the direction in which the electrode terminals 30 and 40 extend. Further, the peripheral wall 21 of the case 20 can be deformed into a square ring shape. Further, the peripheral wall 21 of the case 20 can be deformed into another polygonal ring shape or an annular shape.

The suppression portion 29 can be formed separately from the peripheral wall 21 and the suppression portion 29 can be fixed to the inner peripheral surface of the peripheral wall 21 by vibration welding or the like.
It is also possible to fix one end of the restraining portion 29 only to the support portion 23 and not to the inner peripheral surface of the peripheral wall 21.

-The support part 23 can also be abbreviate | omitted. In this case, both ends of the suppressing portion 29 may be fixed to the inner peripheral surface of the peripheral wall 21.
Only one end of the suppressing portion 29 can be fixed to the inner peripheral surface of the peripheral wall 21.

-The opposing surface 291 of the suppression part 29 can also be made into a curved surface form. For example, as shown in FIG. 16, the opposing surface 291 may have an arcuate cross section.
In place of the sheet-like separator 80, a bag-like separator can be adopted. In this case, the electromotive part 61 of the positive electrode sheet 60 or the electromotive part 71 of the negative electrode sheet 70 is inserted into the separator. Further, the separator may be integrated by being attached to the surface of the electromotive portion 61 of the positive electrode sheet 60 or the electromotive portion 71 of the negative electrode sheet 70.

  -It can replace with the secondary battery 10 and can also implement an electrical storage apparatus as an electrical double layer capacitor.

  DESCRIPTION OF SYMBOLS 10 ... Secondary battery, 11, 12 ... Rivet, 13 ... Screw, 20 ... Case, 21 ... Peripheral wall, 211, 212 ... Groove, 213 ... Meat removal part, 214, 215 ... Outer periphery, 22 ... Insertion hole, 23 ... Support portion, 231 ... support hole, 24 ... injection hole, 25,26 ... positioning protrusion, 27,28 ... hole, 29 ... inhibiting portion, 291 ... opposite surface, 30 ... positive electrode terminal, 301 ... laminated surface, 302 ... square Part, 31, 32 ... hole, 33 ... ring groove, 34 ... pressing member, 35 ... hole, 36 ... rivet, 37 ... O-ring, 38 ... regulating pin, 381 ... shaft part, 382 ... base part, 40 ... negative electrode terminal , 401 ... laminated surface, 402 ... corner, 41 ... hole, 44 ... pressing member, 45 ... hole, 46 ... rivet, 48 ... regulating pin, 50 ... electrode laminate, 60 ... positive electrode sheet, 61 ... electromotive part 62 ... current collector, 63 ... base material, 64 ... active material layer, 65 ... Hole: 66 ... Recess, 70 ... Negative electrode sheet, 71 ... Electromotive part, 72 ... Current collecting part, 73 ... Base material, 74 ... Active material layer, 75 ... Long hole, 76 ... Recess, 80 ... Separator, 81 ... Insulating sheet, 91 ... cover, 911 ... hole, 92 ... cover, 921 ... hole, 93 ... sealant, 101 ... lower jig, 102 ... upper jig.

Claims (5)

A case having an annular peripheral wall formed with a pair of insertion holes;
A pair of covers provided at both openings of the case;
A positive electrode terminal and a negative electrode terminal that are respectively inserted into the pair of insertion holes and have a laminated surface;
A plurality of positive electrode sheets laminated on the lamination surface of the positive electrode terminals, a plurality of negative electrode sheets laminated on the lamination surface of the negative electrode terminals, and between the positive electrode sheet and the negative electrode sheet An electrode laminate having a separator that is positioned and insulates the positive electrode sheet and the negative electrode sheet,
In the case, the electrode sheet having the electrode sheet laminated on the laminated surface is pressed against the laminated surface of the electrode terminal, and a suppressing portion for suppressing the electrode sheet from being bent and deformed is provided with the electrode terminal. It is provided side by side ,
A support portion that supports an end portion of the electrode terminal is formed on the inner peripheral surface of the peripheral wall,
The suppression part is fixed to the support part,
Power storage device. The suppressor has a facing surface facing the electrode sheet,
The facing surface is farther away from the stacking surface in the stacking direction of the electrode sheet as it is farther from the electrode terminal in the direction in which the electrode terminal and the restraining portion are arranged.
The power storage device according to claim 1. The facing surface is an inclined surface inclined with respect to the laminated surface.
The power storage device according to claim 2. Both ends of the suppression portion are fixed to a pair of inner peripheral surfaces facing each other of the peripheral wall,
The electrical storage apparatus as described in any one of Claims 1-3. The peripheral wall and the suppression portion are integrally formed of a resin material,
The electrical storage apparatus as described in any one of Claims 1-4 .