JP2013125691A - Power storage device and vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure mutual positional accuracy of a positive electrode, a negative electrode and a separator not only during assemblage of an electrode body but also after the electrode body is housed in a battery case, and to laminate the positive electrode, the negative electrode and the separator in a shorter time when compared with a case where a positioning member is not used.SOLUTION: In a secondary battery 10, an electrode body 11 is housed in a battery case 12. The electrode body 11 is configured by laminating a plurality of positive electrode sheets 13 and a plurality of negative electrode sheets 14 alternately, in a state where a sheet-like separator 15 exists between the positive electrode sheet 13 and the negative electrode sheet 14. Holes 13d, 14d, 15a are formed, respectively, in the positive electrode sheet 13, the negative electrode sheet 14 and the separator 15, which are thereby housed in the battery case 12 while being positioned by means of a positioning member 21 penetrating the holes 13d, 14d, 15a.

Description

  The present invention relates to a power storage device and a vehicle, and more specifically, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked in a state where a sheet-like separator exists between the positive electrode sheet and the negative electrode sheet. The present invention relates to a power storage device such as a secondary battery or a capacitor housed in a case, and a vehicle on which the power storage device is mounted.

  As a secondary battery having a stacked electrode body, there is a structure in which an electrode body is accommodated together with an electrolytic solution in a battery case. Generally, an electrode body is accommodated in a battery case after a plurality of positive electrode sheets, a plurality of negative electrode sheets, and a separator are laminated outside the battery case. When laminating electrode sheets and separators with a conventional laminating machine, there is a problem that it takes a long time for laminating because it requires laminating accuracy. In addition, there is a problem that the positions of the electrode sheet and the separator gradually shift during lamination. In addition to the secondary battery, the capacitor has the same problem.

  In order to prevent misalignment during lamination, as shown in FIG. 10, a plate-like jig body 52 as a lamination jig 51 and a positive guide pin 53 erected at a predetermined position of the jig body 52. And the method of using the thing provided with the guide pin 54 for negative electrodes is disclosed (refer patent document 1). Then, a positioning hole (not shown) is formed in the positive electrode current collecting piece 62a of the positive electrode 61a, a positioning hole (not shown) is formed in the negative electrode current collecting piece 62b of the negative electrode 61b, and the positioning holes serve as the guide pins 53 and 54. The electrode laminate (electrode body) D is manufactured by laminating the positive electrode 61a, the negative electrode 61b, and the separator 63 while positioning in a state of being inserted into the electrode. In addition, the electrode laminate D after completion of lamination is removed from the guide pins 53 and 54 and accommodated in the battery case.

JP 2002-270242 A

  In the method of Patent Document 1, the guide pins 53 and 54 contribute to the positioning of the positive electrode 61a and the negative electrode 61b when the electrode laminate D is assembled. However, after the electrode laminate D is assembled, the electrode laminate D is removed from the guide pins 53 and 54. Therefore, when the electrode laminate D is moved to the battery case or when it is accommodated in the battery case, the battery case After being accommodated in the guide pins 53 and 54, they do not contribute to the positioning of the positive electrode 61a and the negative electrode 61b.

  The present invention has been made in view of the above problems, and its purpose is not limited to the assembly of the electrode body, and the positions of the positive electrode, the negative electrode, and the separator after the electrode body is accommodated in the case. It is an object of the present invention to provide a power storage device that can ensure the accuracy of the relationship and can stack the positive electrode, the negative electrode, and the separator in a shorter time than when no positioning member is used. Another object is to provide a vehicle equipped with the power storage device.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately arranged in a state in which a sheet-like separator exists between the positive electrode sheet and the negative electrode sheet. The electrode body configured by stacking is a power storage device housed in a case, and a hole is formed in each of the positive electrode sheet, the negative electrode sheet, and the separator, and a positioning member that penetrates each of the holes. It is accommodated in a state of being positioned in the case.

  The positioning member may be provided on the case body or lid of the case, or may be formed separately from the case. The electrode body constituting the power storage device of the present invention is positioned by laminating the positive electrode sheet, the negative electrode sheet, and the separator in a state where the holes formed in the positive electrode sheet, the negative electrode sheet, and the separator are inserted into the positioning member, respectively. Therefore, the positive electrode, the negative electrode, and the separator can be stacked in a shorter time than when the positioning member is not used. Further, not only when the electrode body is assembled, but also after the electrode body is accommodated in the case, the accuracy of the positional relationship among the positive electrode, the negative electrode, and the separator can be ensured by the presence of the positioning member.

  According to a second aspect of the present invention, in the first aspect of the present invention, the positioning member is configured separately from the case main body of the case. Here, the “case body” means a portion that accommodates the electrode body of the case. The “separate body” includes those that are joined to the case by welding or the like after the electrode body is assembled.

  When the positioning member is provided on the case body of the case, the positive electrode sheet, the negative electrode sheet, and the separator are stacked at a position surrounded by the side wall of the case body when the electrode body is assembled. Lamination work is difficult. However, in this invention, since the positioning member is configured separately from the case main body of the case, when laminating the positive electrode sheet, the negative electrode sheet and the separator, the side wall of the case main body does not affect the laminating operation, Lamination work becomes easy.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the positioning member has a rod shape, and the case main body of the case has an opening in the extending direction of the positioning member. A lid that is formed and covers the opening is fixed to the case main body so as to cover the opening while being in contact with an outer surface in a direction orthogonal to the stacking direction of the electrode body housed in the case main body. ing.

  When the positive electrode sheet, the negative electrode sheet, and the separator constituting the electrode body are accommodated in the case in a compressed state in the stacking direction, the volume energy density of the power storage device is increased. In this invention, since the electrode body can be accommodated in the case body by moving in the direction in which the rod-shaped positioning member extends, that is, in the stacking direction of the positive electrode sheet or the like, the positive electrode sheet or the like is pressed and compressed in the accommodated state. Easy to do. In addition, since the lid is fixed to the case body so as to cover the opening of the case body in a state in which the lid is in contact with the outer surface in the direction orthogonal to the stacking direction of the positive electrode sheet or the like constituting the electrode body, By pressing the electrode body, the lid body can be fixed to the case body in that state, and it becomes easier to press and compress the positive electrode sheet or the like of the electrode body.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the power storage device is a lithium ion secondary battery, and an area of the positive electrode sheet is an area of the negative electrode sheet. The holes are formed in the positive electrode sheet and the negative electrode sheet so as to be smaller.

  The area of the active material layer of the positive electrode sheet and the area of the active material layer of the negative electrode sheet may be the same around the holes formed in the positive electrode sheet and the negative electrode sheet. Due to dimensional accuracy, the area of the active material layer of the negative electrode may be smaller than the area of the active material layer of the positive electrode. If the area of the active material layer of the negative electrode is reduced, lithium is deposited on the active material layer of the negative electrode, which is not preferable. However, in the present invention, the holes formed in the positive electrode sheet and the negative electrode sheet are formed so that the area of the positive electrode sheet is smaller than the area of the negative electrode sheet. There is no possibility that the area of the active material layer of the negative electrode is smaller than the area of the active material layer of the positive electrode due to accuracy or the like.

  The invention according to claim 5 is a vehicle in which the power storage device according to any one of claims 1 to 4 is mounted. Therefore, the vehicle of the present invention can achieve the effect of the power storage device according to any one of claims 1 to 4.

  According to the first to fourth aspects of the invention, not only when the electrode body is assembled, but also after the electrode body is accommodated in the case, the accuracy of the positional relationship among the positive electrode, the negative electrode, and the separator is ensured. In addition, it is possible to provide a power storage device in which the positive electrode, the negative electrode, and the separator can be stacked in a shorter time than in the case where the positioning member is not used. Moreover, according to the invention of Claim 5, the vehicle carrying the said electrical storage apparatus can be provided.

(A) is sectional drawing of the secondary battery of 1st Embodiment, (b) is AA sectional view taken on the line of (a), (c) is a model which shows the shape of the hole formed in the negative electrode sheet and the separator. FIG. 4D is a schematic diagram illustrating the shape of holes formed in the positive electrode sheet, and FIG. 4E is a schematic diagram illustrating details of the positive electrode sheet and the negative electrode sheet. The schematic exploded perspective view of a case main body, an electrode body, and a lid. The schematic perspective view which shows arrangement | positioning of the positioning member in the case of assembling an electrode body. (A) is a schematic cross section which shows the state in the middle of the electrode body being accommodated in a case main body, (b) is a schematic cross section of the state which attached the cover body. The perspective view of the cover body of the secondary battery of 2nd Embodiment. The schematic cross section which shows the state in which the electrode body was accommodated in the case main body. (A) is sectional drawing of the secondary battery of 3rd Embodiment, (b) is a schematic cross section which shows the state in the middle of the electrode body being accommodated in a case main body. The schematic cross section which shows the state by which the cover body was similarly fixed to the case main body. (A), (b) is a schematic diagram which shows the shape of the hole of another embodiment. Sectional drawing of a prior art.

(First embodiment)
A first embodiment in which the present invention is embodied in a lithium ion secondary battery will be described below with reference to FIGS.

  As shown in FIGS. 1A and 1B, a secondary battery 10 as a power storage device has an electrode body 11 housed in a battery case 12 as a case. The electrode body 11 is configured by alternately laminating a plurality of positive electrode sheets 13 and a plurality of negative electrode sheets 14 with a sheet-like separator 15 between the positive electrode sheet 13 and the negative electrode sheet 14.

  As shown in FIG.1 (e), the positive electrode sheet 13 is comprised by the metal electrical power collector 13a and the active material layer 13b formed in the both surfaces. The negative electrode sheet 14 includes a metal current collector 14a and an active material layer 14b formed on both surfaces thereof. The current collector 13a is formed in a substantially rectangular shape, and is formed so that an active material non-applied portion 13c in which the active material layer 13b is not formed bulges out from a part of the rectangle. The current collector 14a is also formed in a substantially rectangular shape, and is formed so that the active material non-applied portion 14c in which the active material layer 14b is not formed bulges out from a part of the rectangle.

  As shown in FIG. 1A, in the electrode body 11, the positive electrode current collector terminal 16 is electrically connected to the active material non-applied portion 13c by welding, and the negative electrode current collector terminal 17 is connected to the active material non-applied portion 14c. Are electrically connected by welding. The positive current collector terminal 16 is fixed to the positive terminal 18 of the secondary battery 10 and is electrically connected to the positive terminal 18, and the negative current collector terminal 17 is fixed to the negative terminal 19 of the secondary battery 10. It is electrically connected to the negative terminal 19. The electrode body 11 constitutes the secondary battery 10 together with the electrolytic solution 20 injected into the battery case 12.

  1A and 1B are schematically drawn to make the configuration of the secondary battery 10 easy to understand. Actually, the number of the positive electrode sheets 13 and the negative electrode sheets 14 is several tens. In FIGS. 1A and 1B, the active material layers 13b and 14b are not shown.

  The positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are formed with holes 13d, 14d, and 15a, respectively, and are accommodated in a state of being positioned in the battery case 12 by a positioning member 21 that passes through the holes 13d, 14d, and 15a. ing. The positioning member 21 is formed in a rod shape.

  As shown in FIGS. 1B and 2, the battery case 12 includes a case main body 22 and two lids 23 a and 23 b that cover the two openings 22 a and 22 b of the case main body 22. The first opening 22 a is formed at a position where the electrode body 11 can be accommodated in the case body 22 by moving the electrode body 11 in the extending direction of the positioning member 21. Specifically, the first opening 22 a is formed in the direction in which the positioning member 21 extends, and the lid 23 a covering the opening 22 a is in a direction orthogonal to the stacking direction of the electrode body 11 accommodated in the case body 22. It is fixed to the case body 22 so as to cover the opening 22a while being in contact with the outer surface.

  The second opening 22b is formed at a position facing the active material non-applied portion 13c and the active material non-applied portion 14c in a state where the electrode body 11 is accommodated in the case main body 22. A positive electrode terminal 18 and a negative electrode terminal 19 are fixed to the lid body 23b covering the opening 22b.

  The positioning member 21 is configured such that the electrode body 11 can be assembled outside the case body 22 of the battery case 12. More specifically, the positioning member 21 is formed separately from the case main body 22 and the lid body 23a. On the other hand, the side wall and the lid 23a facing the opening 22a of the case main body 22 are recessed at a position where the end of the positioning member 21 can be stored in a state where the electrode body 11 is stored at a predetermined position of the case main body 22. 22c and 23c are formed. The positioning member 21 is fixed to the case main body 22 with the lid 23a covering the opening 22a, the distal end of the positioning member 21 is engaged with the recess 22c of the case main body 22, and the proximal end is the lid. It is being fixed to the battery case 12 in the state engaged with the recessed part 23c of 23a.

  The positioning member 21 is formed in a straight bar shape having a non-circular cross section (in this embodiment, an oval shape) and a uniform thickness. Since the positioning member 21 needs to ensure electrical insulation from the positive electrode sheet 13 and the negative electrode sheet 14, an insulating coating is formed on the surface of a metal bar.

  The holes 14d and 15a formed in the negative electrode sheet 14 and the separator 15 are formed in the same non-circular shape (oval shape in this embodiment) as the cross section of the positioning member 21. As shown in FIGS. 1C and 1D, the hole 13 d of the positive electrode sheet 13 is formed with a plurality of notches 24 along a part of an oval circumference having the same size as the hole 14 d of the negative electrode sheet 14. Strictly speaking, it is not oval. The notch 24 is formed around the hole 13d so that the area of the positive electrode sheet 13 is smaller than the area of the negative electrode sheet 14. That is, the holes 13 d and 14 d are formed in the positive electrode sheet 13 and the negative electrode sheet 14 so that the area of the positive electrode sheet 13 is smaller than the area of the negative electrode sheet 14.

Next, a method for manufacturing the secondary battery configured as described above will be described.
The positive electrode sheet 13 and the negative electrode sheet 14 are formed by applying a positive electrode active material or a negative electrode active material to a metal foil strip, forming an active material non-applied portion 13c or an active material non-applied portion 14c, and holes 13d and 14d. Are formed, and each sheet is cut into a predetermined size. The holes 13d and 14d are formed by punching with a mold. In addition, the separator 15 is formed by forming the holes 15a in the strip-shaped separator material at a predetermined interval, and then separating each of them into a predetermined size.

  When assembling the electrode body 11, as shown in FIG. 3, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are positioned in the state where the positioning member 21 is erected on the support plate 25, and the holes 13d, 14d, and 15a are positioning members. Laminate in a state of being inserted through 21. At this time, since the positioning member 21 is formed of a straight bar having a non-circular cross-sectional shape, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are not displaced by the positioning member 21 in the rotational direction. Positioned and stacked.

  Since the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are not flat but slightly curved, there is a gap between the positive electrode sheet 13 and the separator 15, and between the separator 15 and the negative electrode sheet 14 when simply stacked. Thus, the electrode body 11 becomes bulky. For this reason, it is preferable to reduce the thickness of the electrode body 11 by compressing the multilayer body in the middle of the lamination or after the predetermined number of layers constituting the electrode body 11 have been completed.

  After the lamination of the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15, the positive electrode current collector terminal 16 is connected to the active material non-applied part 13c of the positive electrode sheet 13 by welding, and the negative electrode is connected to the active material non-applied part 14c of the negative electrode sheet 14 The current collecting terminal 17 is connected by welding. Next, the positioning member 21 is removed from the support plate 25 together with the electrode body 11 and accommodated in the case main body 22. At this time, in order to prevent the positive electrode sheet 13, the negative electrode sheet 14, and a part of the separator 15 from being detached from the positioning member 21 during the movement of the electrode body 11, the case body is held in a state where the electrode body 11 is held by a holding member (not shown). It is preferable to move to a position corresponding to the first opening 22a of 22.

  As shown in FIG. 4A, the electrode body 11 is inserted into the case body 22 from the opening 22 a in a state where one end of the positioning member 21 faces the recess 22 c formed in the case body 22. And after removing the clamping member which clamps the electrode body 11 from the electrode body 11 through the opening part 22b, as shown in FIG.4 (b), one end of the positioning member 21 becomes the recessed part 22c of the case main body 22. As shown in FIG. The electrode body 11 is accommodated in the case main body 22 in the engaged (fitted) state. Next, the lid 23 a is fixed to the case body 22 so as to cover the first opening 22 a in a state where the concave portion 23 c is engaged with the other end of the positioning member 21.

  The volume energy density of the secondary battery 10 increases when the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 constituting the electrode body 11 are accommodated in the battery case 12 in a compressed state in the stacking direction. In this embodiment, since the electrode body 11 can be moved in the direction in which the positioning member 21 extends, i.e., in the stacking direction of the positive electrode sheet 13 and the like, and accommodated in the case body 22, the positive electrode sheet 13 and the like are accommodated in the accommodated state. It becomes easy to press and compress. Further, since the lid body 23a is fixed to the case body 22 so as to cover the opening 22a in contact with the outer surface in the direction orthogonal to the stacking direction of the electrode body 11 accommodated in the case body 22, the lid body 23a In this state, the lid body 23a can be fixed to the case main body 22 and the positive electrode sheet 13 and the like of the electrode body 11 can be pressed and compressed more easily.

  Next, as shown in FIGS. 1A and 1B, a lid body 23 b that covers the second opening 22 b is attached to the case body 22, the positive electrode current collector terminal 16 is fixed to the positive electrode terminal 18, and the negative electrode A negative electrode current collecting terminal 17 is fixed to the terminal 19. Thereafter, the electrolytic solution is injected into the case body 22 to complete the secondary battery 10.

Although the secondary battery 10 is used for various purposes, for example, it is also used in a state where it is mounted on a vehicle.
Next, the operation of the secondary battery 10 configured as described above will be described.

  Since the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 constituting the electrode body 11 are accommodated in the battery case 12 in a compressed state in the stacking direction, the volume energy density of the secondary battery 10 is increased.

  In the case of a lithium ion battery, the area of the active material layer 13b of the positive electrode sheet 13 and the area of the active material layer 14b of the negative electrode sheet 14 are the same around the holes 13d and 14d formed in the positive electrode sheet 13 and the negative electrode sheet 14. That's fine. However, the area of the active material layer 14b of the negative electrode sheet 14 (negative electrode) is equal to the area of the active material layer 13b of the positive electrode sheet 13 (positive electrode) due to dropout of the active material and dimensional accuracy when forming the holes 13d and 14d. There is also a risk of becoming smaller. When the area of the active material layer 14b of the negative electrode sheet 14 is reduced, lithium is deposited on the active material layer 14b of the negative electrode sheet 14, which is not preferable. However, holes 13 d and 14 d are formed in the positive electrode sheet 13 and the negative electrode sheet 14 so that the area of the positive electrode sheet 13 is smaller than the area of the negative electrode sheet 14. Therefore, there is no possibility that the area of the active material layer 14b of the negative electrode sheet 14 is smaller than the area of the active material layer 13b of the positive electrode sheet 13 due to dropout or dimensional accuracy of the active material when forming the holes 13d and 14d. Lithium precipitation is prevented.

According to this embodiment, the following effects can be obtained.
(1) In the secondary battery 10, the electrode body 11 is accommodated in the battery case 12, and the electrode body 11 includes a plurality of positive electrode sheets 13 and a plurality of negative electrode sheets 14 between the positive electrode sheet 13 and the negative electrode sheet 14. The sheet-like separators 15 are alternately stacked in the presence of the sheet-like separators 15. The positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are formed with holes 13d, 14d, and 15a, respectively, and are accommodated in a state of being positioned in the battery case 12 by a positioning member 21 that passes through the holes 13d, 14d, and 15a. ing. Therefore, the electrode body 11 constituting the secondary battery 10 includes the positive electrode sheet 13, the negative electrode sheet 14, and the negative electrode sheet 14, and the positive electrode sheet 13, the negative electrode sheet 15, and the negative electrode sheet 14, and the separator 15, with the holes 13 d, 14 d, 15 a inserted through the positioning member 21 By laminating the sheet 14 and the separator 15, the sheet 14 and the separator 15 are laminated in a positioned state. Therefore, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 can be stacked in a shorter time than when the positioning member 21 is not used. Further, not only when the electrode body 11 is assembled, but also after the electrode body 11 is accommodated in the battery case 12, the presence of the positioning member 21 increases the accuracy of the positional relationship among the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15. Can be secured. As a result, the gap between the electrode body 11 and the inner surface of the case main body 22 required when the electrode body 11 is accommodated in the case main body 22 is reduced, the dead space is reduced, and the volume energy density (capacity) of the secondary battery 10 is increased. .

  (2) The positioning member 21 is configured separately from the case main body 22 of the battery case 12. Therefore, when laminating the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15, the side wall of the case body 22 does not affect the laminating operation, and the laminating operation is facilitated.

  (3) The positioning member 21 has a rod shape, and the case main body 22 of the battery case 12 is formed with a first opening 22a in the extending direction of the positioning member 21 and covers the first opening 22a. 23a is in contact with the outer surface of the electrode body 11 accommodated in the case body 22 in the direction orthogonal to the stacking direction, and is fixed to the case body 22 so as to cover the first opening 22a. Therefore, it becomes easy for the electrode body 11 to be compressed by being pressed by the positive electrode sheet 13 or the like while being accommodated in the case main body 22. Moreover, the electrode body 11 can be pressed by the cover body 23a, and the cover body 23a can be fixed to the case main body 22 in this state, and the battery case 12 can be pressed in a state where the positive electrode sheet 13 or the like of the electrode body 11 is pressed and compressed. It becomes easier to accommodate inside.

  (4) The secondary battery 10 is a lithium ion battery, and holes 13 d and 14 d are formed in the positive electrode sheet 13 and the negative electrode sheet 14 so that the area of the positive electrode sheet 13 is smaller than the area of the negative electrode sheet 14. Therefore, there is no possibility that the area of the active material layer 14b of the negative electrode sheet 14 is smaller than the area of the active material layer 13b of the positive electrode sheet 13 due to dropout of the active material or dimensional accuracy when forming the holes 13d and 14d. . Therefore, lithium is prevented from being deposited on the active material layer 14b of the negative electrode sheet 14.

  (5) The holes 13d, 14d, and 15a are non-circular and are positioned by the positioning member 21 having a non-circular cross section. Therefore, positioning in the rotational direction can also be performed, and positioning accuracy is higher than in the case of a circular shape.

  (6) The positioning member 21 has an electrically insulating coating formed on the surface of a metal bar. Therefore, the thermal conductivity is improved as compared with the case where the entire positioning member 21 is formed of an electrical insulating material, and the heat dissipation is improved when the secondary battery 10 including the electrode body 11 is used to generate heat. Moreover, compared with the case where the positioning member 21 is formed with a cylindrical body having the same outer diameter, the heat capacity is increased, and the temperature rise is reduced when the heat generation is the same.

(7) The vehicle equipped with the secondary battery 10 can obtain the effects of the secondary battery 10.
(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. This embodiment is different from the first embodiment in that the positioning member 21 is provided integrally and perpendicularly to the lid body 23a of the battery case 12. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 5 and 6, the positioning member 21 is formed so as to protrude perpendicularly to the lid body 23 a at a substantially central portion of the lid body 23 a. The surface of the lid 23a opposite to the side from which the positioning member 21 projects is formed flat. As shown in FIG. 5, the electrode body 11 of this embodiment includes a positive electrode sheet 13, a negative electrode sheet 14, and a separator 15 in a state where the lid member 23 a is fixed on a table (not shown) so that the positioning member 21 protrudes upward. Are stacked in a state where the holes 13d, 14d, and 15a are inserted through the positioning member 21.

  After the lamination of the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15, the positive electrode current collector terminal 16 and the negative electrode current collector terminal are connected to the active material non-applied part 13 c of the positive electrode sheet 13 and the active material non-applied part 14 c of the negative electrode sheet 14. After the 17 is connected by welding, the electrode body 11 is moved together with the lid body 23 a and accommodated in the case body 22. At this time, since the positioning member 21 is integrated with the lid body 23a, a part of the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 is moved during the movement of the electrode body 11 without the electrode body 11 being clamped by a clamping member (not shown). Can be easily moved to a position corresponding to the first opening 22a of the case body 22 in a state in which it is prevented from coming off from the positioning member 21.

Therefore, according to this embodiment, in addition to the effects (1) to (5) of the first embodiment, the following effects can be obtained.
(8) Since the positioning member 21 and the lid body 23a are integrated, the number of parts is reduced, and the support plate 25 for supporting the positioning member 21 is not required when the electrode body 11 is assembled. Further, after the assembly of the electrode body 11 with respect to the positioning member 21, that is, the electrode body 11 is formed by completing the lamination of the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15, the lid body 23a is moved together with the electrode body 11, When the operation of engaging one end (tip) of the positioning member 21 with the concave portion 22 c of the case main body 22 is performed, the lid 23 a covers the first opening 22 a of the case main body 22. Therefore, the housing and fixing work of the electrode body 11 in the battery case 12 is simplified as compared with the first embodiment.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS. In this embodiment, the positioning member 21 is housed in the battery case 12, and one end of the positioning member 21 is screwed into a bolt as a fastening body fixed to the lid body 23 a of the battery case 12. The point which is fixed to is different from the first embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7 (a), a female thread portion 21a is formed at the base end of the positioning member 21, that is, the end opposite to the distal end that engages with the recess 22c of the case body 22, and the lid 23a has a female thread portion 21a. A bolt insertion hole 26 is formed at a position facing 21. A packing 27 is disposed in the bolt insertion hole 26, and the bolt 28 is screwed into the female screw portion 21 a while passing through the bolt insertion hole 26, so that the lid 23 a is fixed to the positioning member 21.

  In the case of this configuration, when assembling the electrode body 11, the positioning member 21 has the same cross-sectional shape as the positioning member 21, and an extension member 29 having a male screw portion (not shown) that is screwed into the female screw portion 21 a is connected. In use, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are stacked. The total length of the positioning member 21 and the extending member 29 is sufficiently longer than the thickness of the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15, which are necessary for constituting the electrode body 11, without being compressed. Yes. Therefore, even if the electrode body 11 is removed from the support plate 25 together with the positioning member 21 in a state where the lamination is completed without being compressed in the middle of the lamination, the laminated positive electrode sheet 13 and the like are It is avoided that the positioning member 21 falls off from the positioning member 21 during the movement.

  As shown in FIG. 7B, the extension member 29 protrudes from the case body 22 when the tip of the positioning member 21 is engaged with the recess 22 c of the case body 22. From this state, with the extension member 29 passing through the bolt insertion hole 26 of the lid body 23a, the lid body 23a is moved so as to press the positive electrode sheet 13 and the like, and as shown in FIG. It is moved to a position where it abuts 22. Next, the extension member 29 is removed from the positioning member 21. Then, with the packing 27 inserted in the bolt insertion hole 26, the bolt 28 is screwed into the female screw portion 21a, and the positioning member 21 is fixed to the lid body 23a.

In this embodiment, the following effects can be obtained in addition to the effects (1) to (6) of the first embodiment.
(9) The electrode body 11 can be assembled with the extension member 29 connected to the positioning member 21. Therefore, even if the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are laminated without being compressed, when the electrode body 11 is moved together with the positioning member 21 after the lamination is completed, the laminated positive electrode sheets 13, etc. Can be removed from the positioning member 21 and can be easily moved without using a clamping member. In addition, it is not necessary to remove the clamping member, and it is easy to increase the number of stacked positive electrode sheets 13, negative electrode sheets 14, and separators 15.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ The cross-sectional shape of the positioning member 21 for positioning the positive electrode sheet or the like in a state in which the rotation of the positive electrode sheet is restricted is not limited to an oval shape, and may be a non-circular shape, for example, an elliptical shape or a polygonal shape. Good. When there are corners such as polygons, the shapes of the holes 14d and 15a corresponding to the corners prevent polygons from cracking. For example, as shown in FIG. It is preferable to provide an arc portion at the position of the portion.

  The shape of the holes 14d and 15a may be circular. In this case, the hole 13d of the positive electrode sheet 13 has a shape in which a recess (notch) is provided around the circle as shown in FIG. 9B, for example.

The positioning member 21 is not limited to a metal bar having an insulating film formed thereon. For example, an insulating material with good thermal conductivity may be used.
The positioning member 21 may be formed of an insulating material with poor thermal conductivity.

  O You may provide the positioning member 21 in the state which protrudes from the side wall facing the 1st opening part 22a of the case main body 22. As shown in FIG. In this case, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are stacked outside the case body 22 using a jig in which positioning columns having the same cross-sectional shape as the holes 14 d and 15 a are erected, and the electrode body 11 is stacked. After forming the electrode body 11, the electrode body 11 may be removed from the jig and accommodated in a state of being inserted into the positioning member 21 provided in the case main body 22. In addition, the positive electrode sheet 13, the negative electrode sheet 14, and the separator 15 are attached to the case so that the holes 13 d, 14 d, and 15 a are inserted into the positioning member 21 provided in the case main body 22 without being stacked outside the case main body 22. The electrode body 11 may be formed by stacking in the main body 22.

  When the positioning member 21 is formed separately from the battery case 12, the end surface of the positioning member 21 is provided without providing the case main body 22 and the lid 23a with the recesses 22c and 23c with which the end of the positioning member 21 is engaged. It is good also as a structure which contact | abuts to the case main body 22 and the cover body 23a, and is fixed. Further, a recess may be formed at the end of the positioning member 21, and a protrusion that engages (fits) the recess may be provided on the case body 22 and the lid body 23a.

  ○ After assembling the electrode body 11 using the positioning member 21 formed separately from the battery case 12, and housing the electrode body 11 in the battery case 12, the positioning member 21 is joined to the battery case 12 by welding or the like. Also good.

  A groove extending over the entire length in the longitudinal direction of the positioning member 21 may be provided on the outer surface of the positioning member 21. One groove or a plurality of grooves may be provided. In this case, when the active material layers 13b and 14b are impregnated with the electrolytic solution 20 when the secondary battery 10 is manufactured, the electrolytic solution 20 also flows from the grooves formed on the surface of the positioning member 21. 14b is impregnated, so that the electrolytic solution is impregnated quickly, and the time required for the impregnation can be shortened.

  ○ In addition to the first opening 22 a for inserting the electrode body 11 into the case body 22, the positive electrode current collector terminal 16 and the negative electrode current collector terminal 17 are connected to the positive electrode terminal 18 and the negative electrode terminal 19. Therefore, the second opening 22b may not be provided. And you may provide the positive electrode terminal 18 and the negative electrode terminal 19 in the cover body 23a.

  In the third embodiment, the extension member 29 may be connected to the positioning member 21 not by screwing but by fitting of the convex portion and the concave portion. In this case, instead of the bolt 28, a member that fixes the lid 23a to the positioning member 21 in an uneven relationship with respect to the positioning member 21 is used.

  The electrode body 11 is not limited to a configuration in which the active material non-applied portion 13c of the positive electrode sheet 13 and the active material non-applied portion 14c of the negative electrode sheet 14 protrude to the same side, and may be configured to protrude to the opposite side. For example, when the side on which the positive electrode terminal 18 and the negative electrode terminal 19 of the secondary battery 10 are provided is the upper side, the active material non-applied portion 13c exists on one side of the left side and the right side of the electrode body 11, and the other side You may comprise so that the active material non-application part 14c may exist in the side.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 4, the positioning member is provided integrally and perpendicularly to the lid of the battery case.

  (2) In the invention according to claim 2, in the state where the positioning member is housed in the battery case, one end of the positioning member is screwed into a fastening body fixed to the lid of the battery case. It is fixed to the battery case.

  DESCRIPTION OF SYMBOLS 11 ... Electrode body, 12 ... Battery case as a case, 13 ... Positive electrode sheet, 13d, 14d, 15a ... Hole, 14 ... Negative electrode sheet, 15 ... Separator, 21 ... Positioning member, 22 ... Case main body, 22a, 22b ... Opening Part, 23a, 23b ... lid.

Claims (5)

An electrode body in which a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked in a state where a sheet-like separator is present between the positive electrode sheet and the negative electrode sheet is housed in a case A device,
A hole is formed in each of the positive electrode sheet, the negative electrode sheet, and the separator, and the power storage device is housed in a state of being positioned in the case by a positioning member penetrating each hole.   The power storage device according to claim 1, wherein the positioning member is configured separately from a case main body of the case. The positioning member has a rod shape,
An opening is formed in the case body of the case in the direction in which the positioning member extends, and a lid that covers the opening is formed on an outer surface in a direction perpendicular to the stacking direction of the electrode body housed in the case body. The power storage device according to claim 1 or 2, wherein the power storage device is fixed to the case main body so as to cover the opening in a contact state.   The said electrical storage apparatus is a lithium ion secondary battery, The said hole is formed in the said positive electrode sheet and the said negative electrode sheet so that the area of the said positive electrode sheet may become smaller than the area of the said negative electrode sheet. The electrical storage apparatus as described in any one of these.   A vehicle on which the power storage device according to any one of claims 1 to 4 is mounted.