Energy storage module

Abstract

To provide a power storage module capable of sufficiently reducing resistance of a current path.SOLUTION: A power storage module comprises a power storage device. The power storage device comprises an outer jacket that has a lid plate provided with an external terminal, a polar plate that has a tab and is stored in the outer jacket, a conductive shaft part that penetrates the lid plate and has one end connected to the external terminal, and a conductive plate part that is stored in the outer jacket, has a first face to which the other end of the conductive shaft part is connected and a second face to which the tab is connected. The dimension of the conductive shaft part in a surface direction of the lid plate is greater than the dimension of the external terminal in the surface direction of the lid plate. The tab is integrally formed with the polar plate. The tab is arranged apart from a side face of the outer jacket in the surface direction. The polar plate has a positive electrode plate and a negative electrode plate. The tab has a positive electrode tab which extends from a portion of an edge of the positive electrode plate toward the lid plate, and a negative electrode tab which extends from an edge of the negative electrode plate toward the lid plate.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electricity storage module. [Background technology]

[0002] Chargeable and dischargeable energy storage elements are used in a variety of devices, including mobile phones and automobiles. Vehicles powered by electrical energy, such as electric vehicles (EVs) and plug-in hybrid electric vehicles (PHEVs), require large amounts of energy and are therefore equipped with large-capacity energy storage modules that comprise multiple energy storage elements.

[0003] The energy storage element includes an outer casing and an electrode assembly having a plurality of positive and negative electrode plates housed in the outer casing and stacked with separators interposed therebetween. The positive and negative electrode plates each have a tab. The outer casing is provided with two external terminals corresponding to the positive and negative electrode plates.

[0004] Patent Document 1 discloses a lithium-ion secondary battery having a rectangular case. The lid of the case has a through-hole. A rod-shaped body is inserted into the through-hole, and a first flange is connected to one end of the body inside the case, and a terminal plate (external terminal) is connected to the other end of the body. A tab of an electrode body is connected to the first flange. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-91659 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, there has been a demand for energy storage devices that can be rapidly charged and rapidly discharged. During rapid charging or rapid discharging, a relatively large current flows through the current path. There is a demand for high-performance energy storage devices that have small resistance losses in the current path even when a large current flows. There is also a demand for current paths that do not melt even when a large current flows.

[0007] The present invention has been made in view of the above circumstances, and has an object to provide an electricity storage module that can sufficiently reduce the resistance of a current path. [Means for solving the problem]

[0008] The energy storage module of the present invention comprises an outer casing having an external terminal provided on a cover plate, an electrode plate having a tab and housed in the outer casing, a conductive shaft portion that penetrates the cover plate and has one end connected to the external terminal, and a conductive plate portion that is housed in the outer casing and has the other end of the conductive shaft portion connected to a first surface and the tab connected to a second surface, wherein the dimension of the conductive plate portion in the surface direction of the cover plate is larger than the dimension of the external terminal in the surface direction of the cover plate, the tab is formed integrally with the electrode plate and is positioned apart from a side surface of the outer casing in the surface direction, the electrode plate has a positive electrode plate and a negative electrode plate, and the tab comprises an energy storage element having a positive electrode tab extending from a part of an edge of the positive electrode plate toward the cover plate and a negative electrode tab extending from a part of an edge of the negative electrode plate toward the cover plate. [Effects of the Invention]

[0009] In the present invention, the dimension of the conductive plate portion in the surface direction of the cover plate is larger than the dimension of the external terminal in the surface direction, which increases the contact area between the tab and the conductive plate portion and reduces the resistance of the current path compared to when the dimension of the conductive plate portion in the surface direction is smaller than the dimension of the external terminal in the surface direction. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a schematic perspective view of an energy storage element. [Figure 2] FIG. 2 is a schematic front view of the energy storage element. [Figure 3] 3 is a schematic cross-sectional view of the energy storage element taken along line III-III shown in FIG. 2. FIG. [Figure 4] 4 is a partially enlarged cross-sectional view of the vicinity of the cover plate taken along line IV-IV shown in FIG. 2. FIG. [Figure 5] FIG. 1 is a schematic diagram of a storage module having a plurality of storage elements. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be described below with reference to the drawings showing an energy storage device according to an embodiment. Fig. 1 is a schematic perspective view of the energy storage device, and Fig. 2 is a schematic front view of the energy storage device. Energy storage device 1 may be a lithium ion secondary battery.

[0012] The energy storage device 1 includes a rectangular parallelepiped exterior body 2. The exterior body 2 accommodates a laminated electrode assembly 3 (described later) together with an electrolyte solution. In this embodiment, a metal case is used as the exterior body 2. The material of the metal case may be, for example, aluminum, an aluminum alloy, or stainless steel. The exterior body 2 includes a rectangular bottom wall 7 and a top wall 8 that are arranged opposite each other and have approximately the same size; a rectangular cover plate 9 and a rear wall 10 that connect the short sides of the bottom wall 7 and the top wall 8 and have smaller areas than the bottom wall 7 and the top wall 8; and two rectangular side walls 11, 11 that connect the long sides of the bottom wall 7 and the top wall 8 and have larger areas than the bottom wall 7 and the top wall 8. In this embodiment, the cover plate 9 extends perpendicular to the bottom wall 7 that is installed on a surface (not shown) on which the energy storage device 1 is installed, and the cover plate 9 forms part of the side surface of the energy storage device 1. Alternatively, the cover plate may be located on the top wall 8 opposite the bottom wall 7 of the energy storage device 1.

[0013] As shown in Fig. 2, a positive electrode external terminal 4 is provided at one end of the outer surface of the cover plate 9 via an outer gasket 19, and a negative electrode external terminal 5 is provided at the other end of the outer surface of the cover plate 9 via an outer gasket 19. The positive electrode external terminal 4 and the negative electrode external terminal 5 have exposed flat outer surfaces to which a conductive member (not shown) such as a bus bar can be welded. A rupture valve 6 is provided on the cover plate 9 between the positive electrode external terminal 4 and the negative electrode external terminal 5.

[0014] FIG. 3 is a schematic cross-sectional view of the energy storage element 1 taken along line III-III in FIG. 2. As shown in FIG. 3, the laminated electrode body 3 includes a plurality of positive electrode plates 12, a plurality of negative electrode plates 13, and a plurality of separators 14. The positive electrode plates 12, the negative electrode plates 13, and the separators 14 each have a rectangular shape when viewed in a direction penetrating the side walls 11, 11 in FIG. 3. The plurality of positive electrode plates 12 and negative electrode plates 13 are alternately stacked with the separators 14 interposed therebetween. FIG. 3 shows how negative electrode tabs 16 (described below) extending from each negative electrode plate 13 are bundled at their tip ends and joined to a conductive plate portion 18a. The negative electrode tabs 16 are accommodated in a curved state within the exterior body 2 so as to improve the energy density of the energy storage element 1 (so as to reduce the space occupied by the current path between the negative electrode external terminal 5 and the negative electrode plate 13). Although not shown, a positive electrode tab 15 (described later) extending from the positive electrode plate 12 is also configured in the same manner as the negative electrode tab 16.

[0015] The positive electrode plate 12 has a conductive foil- or sheet-like positive electrode substrate and positive electrode active material layers laminated on both sides of the positive electrode substrate. The negative electrode plate 13 has a conductive foil- or sheet-like negative electrode substrate and negative electrode active material layers laminated on both sides of the negative electrode substrate.

[0016] The separator 14 is formed from a sheet-like or film-like material that is permeable to the electrolyte. Examples of materials for the separator 14 include woven fabric, nonwoven fabric, and porous resin in a sheet or film form. The separator 14 separates the positive electrode plate 12 and the negative electrode plate 13, and also retains the electrolyte between the positive electrode plate 12 and the negative electrode plate 13.

[0017] Figure 4 is a partially enlarged cross-sectional view of the vicinity of the cover plate 9, taken along line IV-IV in Figure 2. Two through holes 9a, 9b are provided in the cover plate 9 at a distance from each other in the longitudinal direction of the cover plate 9. A burst valve 6 is disposed between the two through holes 9a, 9b. Alternatively, the burst valve 6 may be disposed in the rear wall 10 (see Figure 3) facing the cover plate 9.

[0018] As shown in FIG. 4 , an electrically insulating inner gasket 20 is provided on the inner surface of the cover plate 9 near the through hole 9a. The inner gasket 20 has a rectangular gasket body with long sides parallel to the longitudinal direction of the cover plate 9, and the gasket body extends in contact with the inner surface of the cover plate 9. A through hole is provided in the gasket body of the inner gasket 20, and a cylindrical boss 20b is provided to surround the through hole. A recess 20a extending in the longitudinal direction of the cover plate 9 is formed on the surface of the gasket body of the inner gasket 20 facing the laminated electrode assembly 3. The inner gasket 20 has ring-shaped compressible convex portions on both sides of the gasket body on the outer periphery of the boss 20b. The compressible convex portions are not limited to being ring-shaped, and multiple compressible convex portions may be provided at intervals in the circumferential direction. The compressible convex portions may be provided on only one surface (the outer surface or the inner surface) of the gasket body. By crushing the compressible convex portions, the airtightness of the exterior body 2 is ensured.

[0019] An electrically insulating outer gasket 19 is provided on the outer surface of the cover plate 9 near the through hole 9a. The outer gasket 19, like the inner gasket 20, is a rectangular plate with a through hole 19a formed in its center. The diameter of the through hole 19a is larger than the outer diameter of the boss 20b of the inner gasket 20. A recess 19b is formed on one surface of the outer gasket 19. The other surface of the outer gasket 19 faces the outer surface of the cover plate 9. The boss 20b of the inner gasket 20 is inserted into the through hole 9a of the cover plate 9 and the through hole 19a of the outer gasket 19. The tip surface of the boss 20b is approximately flush with the bottom surface of the recess 19b of the outer gasket 19.

[0020] The positive electrode external terminal 4 is plate-shaped and has a through hole 4a formed near the center thereof. The diameter of the through hole 4a is approximately the same as the inner diameter of the boss 20b. A counterbore 4b is formed around the through hole 4a on one surface of the positive electrode external terminal 4. The positive electrode external terminal 4 is disposed in the recess 19b of the outer gasket 19 so that the other surface of the positive electrode external terminal 4 faces the bottom surface of the recess 19b. The through hole 4a and the boss 20b are disposed coaxially, and the counterbore 4b is exposed to the outside.

[0021] The positive electrode external terminal 4 and an outer gasket 19 are disposed on the outer surface of the cover plate 9, and the inner gasket 20 and the positive electrode current collector 17 are disposed on the inner surface of the cover plate 9. When a bus bar or the like is welded to the positive electrode external terminal 4, heat generated by the welding is easily transferred to the outer gasket 19. The compressed convex portion for ensuring the airtightness of the exterior body 2 is provided on the inner gasket 20 as described above, and heat is not easily transferred thereto, so the compressed convex portion can maintain the airtightness of the exterior body 2.

[0022] The positive electrode current collector 17 is attached to the positive electrode external terminal 4. The positive electrode current collector 17 includes a rectangular positive electrode conductive plate portion 17a with long sides parallel to the longitudinal direction of the cover plate 9 and a cylindrical positive electrode conductive shaft portion 17b protruding from one surface of the positive electrode conductive plate portion 17a. The outer diameter of the positive electrode conductive shaft portion 17b is smaller than the diameter of the through hole 4a of the positive electrode external terminal 4 and the inner diameter of the boss 20b of the inner gasket 20. In this embodiment, the positive electrode conductive shaft portion 17b is hollow (hollow rivet), but alternatively, the positive electrode conductive shaft portion may be solid (solid rivet). The other surface of the positive electrode conductive plate portion 17a is formed flat. The other surface of the positive electrode conductive plate portion 17a is preferably flat, but may have some recesses as long as the tab connection is not impaired. The positive electrode conductive plate portion 17a and the positive electrode conductive shaft portion 17b are integrally molded. In this embodiment, the positive electrode conductive plate portion 17a and the positive electrode conductive shaft portion 17b are formed as a single component made of the same material.

[0023] The dimension of the positive conductive plate portion 17a in the longitudinal direction of the cover plate 9, in other words, in the surface direction, is larger than that of the positive external terminal 4. As shown in Fig. 4, in a cross-sectional view, one end 17d and the other end 17e of the positive conductive plate portion 17a protrude in the surface direction of the cover plate 9 from one side end 4c and the other side end 4d of the positive external terminal 4, respectively.

[0024] The positive electrode conductive shaft portion 17b is inserted into the boss 20b through the recess 20a of the inner gasket 20, and its tip portion 17c is positioned outside the through-hole 4a of the positive electrode external terminal 4 and is crimped (expanded). The crimped tip portion 17c is positioned within the counterbore 4b. The positive electrode conductive plate portion 17a is positioned inside the recess 20a. By crimping the tip portion 17c, the positive electrode external terminal 4, the outer gasket 19, the cover plate 9, and the inner gasket 20 are sandwiched between the tip portion 17c and the positive electrode conductive plate portion 17a.

[0025] As shown in Fig. 4, each of the positive electrode plates 12 has a strip-shaped positive electrode tab 15. The dimension of the positive electrode tab 15 in the longitudinal direction of the cover plate 9, in other words, in the surface direction, is larger than that of the positive electrode external terminal 4. The positive electrode tab 15 is formed on the other surface of the positive electrode conductive plate portion 17a, i.e., the positive electrode conductive shaft portion 17b protrudes. The positive electrode tab 15 is connected to the surface opposite to the surface where the positive electrode tab 15 is connected, for example, by ultrasonic welding, laser welding, or crimping. The positive electrode tab 15 is connected to the positive electrode conductive plate portion 17a from the portion of the positive electrode conductive plate portion 17a that protrudes beyond one side end 4c of the positive electrode external terminal 4 to the portion that protrudes beyond the other side end 4d of the positive electrode external terminal 4. The positive electrode tab 15 is connected to at least a portion of the other surface of the positive electrode conductive plate portion 17a that faces the positive electrode conductive shaft portion 17b.

[0026] An inner gasket 20, an outer gasket 19, a negative electrode external terminal 5, and a negative electrode current collector 18 are provided near the through hole 9b of the cover plate 9. These inner gasket 20, outer gasket 19, negative electrode external terminal 5, and negative electrode current collector 18 have the same configuration as the inner gasket 20, outer gasket 19, positive electrode external terminal 4, and positive electrode current collector 17 provided near the through hole 9a, and therefore detailed description thereof will be omitted hereinafter as appropriate.

[0027] The negative electrode external terminal 5 has a through hole 5a and a countersunk hole 5b. The negative electrode current collector 18 has a negative electrode conductive plate portion 18a and a negative electrode conductive shaft portion 18b protruding from one surface of the negative electrode conductive plate portion 18a, and a tip portion 18c of the negative electrode conductive shaft portion 18b is crimped. The dimension of the negative electrode conductive plate portion 18a in the longitudinal direction of the cover plate 9, in other words, in the surface direction, is larger than that of the negative electrode external terminal 5.

[0028] Each of the plurality of negative electrode plates 13 has a strip-shaped negative electrode tab 16. The dimension of the negative electrode tab 16 in the longitudinal direction of the cover plate 9, in other words, in the surface direction, is larger than that of the negative electrode external terminal 5. One end 18d and the other end 18e of the negative electrode conductive plate portion 18a protrude from one end 5c and the other end 5d of the negative electrode external terminal 5, respectively, in the surface direction of the cover plate 9. The negative electrode tab 16 is connected to the other surface of the negative electrode conductive plate portion 18a by, for example, ultrasonic welding, laser welding, or crimping, from the part of the negative electrode conductive plate portion 18a protruding from one end 5c of the negative electrode external terminal 5 to the part protruding from the other end 5d of the negative electrode external terminal 5.

[0029] The above-described energy storage element 1 uses a laminated electrode body in which a plurality of positive electrode plates 12 and negative electrode plates 13 are stacked, but alternatively, a wound electrode body in which one positive electrode plate and one negative electrode plate are wound with a separator interposed therebetween may be used. The positive electrode external terminal 4 and the negative electrode external terminal 5 are arranged on the cover plate 9, but the positive electrode external terminal 4 and the negative electrode external terminal 5 may be provided on two surfaces of the exterior body 2, respectively.

[0030] In the energy storage element 1 described above, the dimensions of the conductive plate portions 17a, 18a and the tabs 15, 16 in the surface direction of the cover plate 9 are larger than the dimensions of the external terminals 4, 5. This increases the contact area between the tabs 15, 16 and the conductive plate portions 17a, 18a, and reduces the resistance of the current path, compared to when the dimensions of the conductive plate portions 17a, 18a and the tabs 15, 16 in the surface direction are smaller than the dimensions of the external terminals 4, 5. Because the width dimensions of the tabs 15, 16 are large, the tabs 15, 16 are less likely to melt even when a large current flows.

[0031] Since the tabs 15, 16 are connected at least to the portions of the conductive plate portions 17a, 18a that face the conductive shaft portions 17b, 18b, the current path from the tabs 15, 16 to the external terminals 4, 5 is the shortest, and the resistance value of the current path can be reduced.

[0032] One ends 17d, 18d and the other ends 17e, 18e of the conductive plate portions 17a, 18a protrude from one end 4c, 5c and the other end 4d, 5d of the external terminals 4, 5, respectively, in the surface direction of the cover plate 9, and the tabs 15, 16 are connected from the parts of the conductive plate portions 17a, 18a that protrude from the one end 4c, 5c of the external terminals 4, 5 to the parts that protrude from the other end 4d, 5d of the external terminals 4, 5. This ensures a sufficiently large contact area between the tabs 15, 16 and the conductive plate portions 17a, 18a, and reduces the resistance of the current path.

[0033] The conductive plate portions 17a, 18a and the conductive shaft portions 17b, 18b are integrally formed, which reduces the resistance of the current path and improves the strength of the current collectors 17, 18 compared to when they are formed as separate parts.

[0034] One end of the conductive shaft portions 17b, 18b is inserted into the through holes 4a, 5a of the external terminals 4, 5 and is crimped to the external terminals 4, 5. For example, the conductive shaft portions 17b, 18b can be attached to the external terminals 4, 5 easily and quickly by spin crimping. By locating the crimping portion on the outside of the cover plate 9, no crimping portion exists on the inside of the cover plate 9. Therefore, the surface of the conductive plate portions 17a, 18a facing the laminated electrode body 3 can be made flat and without irregularities, and the tabs 15, 16 can be easily and reliably joined to that flat surface.

[0035] An energy storage module can be fabricated using multiple energy storage elements 1. FIG. 5 is a schematic diagram of an energy storage module 26 having multiple energy storage elements 1. The energy storage module 26 includes a holding member 24, such as a box or an end plate, and multiple energy storage elements 1 held by the holding member 24. The multiple energy storage elements 1 are arranged so that the walls (cover plates) on which the external terminals are provided face the same direction. In this embodiment, the cover plates of the multiple energy storage elements 1 rise from the installation surface, and the external terminals provided on these cover plates face the sides of the energy storage element module. Among the multiple energy storage elements 1, adjacent energy storage elements are arranged so that the positive electrode external terminal 4 and the negative electrode external terminal 5 are upside down. By connecting the positive electrode external terminal 4 and the negative electrode external terminal 5 of adjacent energy storage elements 1 with a bus bar 25, multiple energy storage elements 1 can be connected in series. Multiple energy storage elements 1 may also be connected in parallel by connecting the same poles.

[0036] Because the conductive plate portions 17a, 18a of the energy storage element 1 are arranged directly below the conductive shaft portions 17b, 18b, the dimensions of the current collectors 17, 18 in the longitudinal direction of the cover plate 9 can be made smaller than when the conductive plate portions 17a, 18a are not arranged directly below the conductive shaft portions 17b, 18b. This allows the height of the energy storage module 26 to be made smaller, making it applicable to cases where it is necessary to arrange the energy storage module in a space with limited height.

[0037] The embodiments disclosed herein are illustrative in all respects and are not restrictive. The described technical features can be combined with each other, and the scope of the present invention is intended to include all modifications within the scope of the claims and the scope equivalent to the claims.

[0038] As long as the resistance of the current path can be sufficiently suppressed, the dimensions of the tabs 15, 16 may be equal to or slightly smaller than the dimensions of the external terminals 4, 5. By joining the tabs 15, 16 to the portions of the conductive plate portions 17a, 18a that face the laminated electrode body 3, facing the conductive shaft portions 17b, 18b, and to both sides of the portions, the contact area between the tabs 15, 16 and the conductive plate portions 17a, 18a can be ensured.

[0039] Although the description has been given of the case where the energy storage element 1 is a lithium ion secondary battery, the energy storage element 1 is not limited to a lithium ion secondary battery. The energy storage element 1 may be another secondary battery such as a nickel-metal hydride battery, a primary battery, or an electrochemical cell such as a capacitor. [Explanation of symbols]

[0040] 1. Energy storage element 2. Exterior body 4 Positive external terminal 5 Negative external terminal 9 Lid plate 12 Positive electrode plate 13 Negative electrode plate 17 Positive electrode current collector 17a Positive electrode conductive plate part 17b Positive conductive shaft 18 Negative electrode current collector 18a Negative conductive plate part 18b Negative conductive shaft part 26 Energy storage module

Claims

1. an exterior body having an external terminal provided on a cover plate; an electrode plate having a tab and housed in the outer casing; a conductive shaft portion that passes through the cover plate and has one end connected to the external terminal; a conductive plate portion housed in the exterior body, the other end of the conductive shaft portion being connected to a first surface thereof and the tab being connected to a second surface thereof; Equipped with a dimension of the conductive plate portion in a surface direction of the cover plate is larger than a dimension of the external terminal in the surface direction of the cover plate; a dimension of the tab in a surface direction of the cover plate is larger than a dimension of the external terminal in the surface direction of the cover plate; the tab is integrally formed with the plate; the tab is disposed apart from a side surface of the exterior body in the planar direction, The electrode plates include a positive electrode plate and a negative electrode plate, The tabs include a positive electrode tab extending from a part of the edge of the positive electrode plate toward the cover plate, and a negative electrode tab extending from a part of the edge of the negative electrode plate toward the cover plate. Equipped with a storage element, Energy storage module.

2. a through hole is formed in the external terminal; One end of the conductive shaft is inserted into the through hole and crimped to the external terminal. The energy storage module according to claim 1 .

3. the second surface of the conductive plate portion is formed flat; The tab is connected to at least a portion of the conductive plate portion facing the conductive shaft portion. The energy storage module according to claim 1 or 2.

4. one end and the other end of the conductive plate portion protrude from one side end and the other side end of the external terminal in a surface direction of the cover plate in a cross-sectional view, The tab is connected to the conductive plate portion from a portion of the conductive plate portion that protrudes from one side end of the external terminal to a portion of the conductive plate portion that protrudes from the other side end of the external terminal. The energy storage module according to claim 1 .

5. The conductive plate portion and the conductive shaft portion are integrally formed. The energy storage module according to claim 1 .

6. The surface direction is the longitudinal direction of the cover plate. The energy storage module according to claim 1 .

7. The dimension of the tab in the surface direction of the cover plate is larger than the dimension of the external terminal and smaller than the dimension of the electrically insulating member disposed between the cover plate and the conductive plate portion. The energy storage module according to claim 1 .

8. The energy storage element has a stacked electrode body in which a plurality of the positive electrode plates and a plurality of the negative electrode plates are stacked. The energy storage module according to claim 1 .

9. Further comprising a bus bar; The size of the conductive plate portion in the longitudinal direction of the cover plate is larger than the size of the bus bar in the longitudinal direction of the cover plate. The energy storage module according to claim 1 .

10. Further comprising a bus bar; The dimension of the tab in the longitudinal direction of the cover plate is larger than the dimension of the bus bar in the longitudinal direction of the cover plate. The energy storage module according to claim 1 .

11. the conductive plate portion has a positive conductive plate portion and a negative conductive plate portion, A rupture valve is provided between the positive electrode conductive plate portion and the negative electrode conductive plate portion in the surface direction of the cover plate. The energy storage module according to claim 1 .

12. Further comprising a plurality of the storage elements and a bus bar, The plurality of energy storage elements are arranged so that the external terminals face the same direction, and the external terminals of adjacent energy storage elements are connected by the bus bar. The energy storage module according to claim 1 .

13. The conductive plate portion has a positive conductive plate portion and a negative conductive plate portion, the positive electrode tab is connected to the positive electrode conductive plate portion, The negative electrode tab is connected to the negative electrode conductive plate portion. The energy storage module according to claim 1 .

14. The device further comprises an electrically insulating member disposed between the cover plate and the conductive plate portion in a direction perpendicular to the surface direction of the cover plate, The size of the conductive plate portion in the surface direction of the cover plate is smaller than the size of the electrically insulating member in the surface direction of the cover plate. The energy storage module according to any one of claims 1 to 13.

15. an exterior body having an external terminal provided on a cover plate; an electrode plate having a tab and housed in the outer casing; a conductive shaft portion that passes through the cover plate and has one end connected to the external terminal; a conductive plate portion housed in the exterior body, the other end of the conductive shaft portion being connected to a first surface thereof and the tab being connected to a second surface thereof; Equipped with a dimension of the conductive plate portion in a surface direction of the cover plate is larger than a dimension of the external terminal in the surface direction of the cover plate; a dimension of the tab in a surface direction of the cover plate is larger than a dimension of the external terminal in the surface direction of the cover plate; the tab is integrally formed with the plate; the tab is disposed apart from a side surface of the exterior body in the planar direction, The electrode plates include a positive electrode plate and a negative electrode plate, the tabs include a positive electrode tab extending from a portion of an edge of the positive electrode plate toward the cover plate, and a negative electrode tab extending from a portion of an edge of the negative electrode plate toward the cover plate, the conductive plate portion has a positive conductive plate portion and a negative conductive plate portion, the positive electrode tab is connected to the positive electrode conductive plate portion, The negative electrode tab is connected to the negative electrode conductive plate portion. Energy storage element.

16. a through hole is formed in the external terminal; One end of the conductive shaft is inserted into the through hole and crimped to the external terminal. The energy storage element according to claim 15.

17. The conductive plate portion and the conductive shaft portion are integrally formed. The energy storage element according to claim 15 or 16.

18. The dimension of the tab in the surface direction of the cover plate is smaller than the dimension of an electrically insulating member disposed between the cover plate and the conductive plate portion in the surface direction of the cover plate. The energy storage element according to any one of claims 15 to 17.

19. The surface direction is the longitudinal direction of the cover plate. The energy storage element according to any one of claims 15 to 18.

20. A laminated electrode body is provided in which a plurality of the positive electrode plates and a plurality of the negative electrode plates are laminated.

20. The energy storage element according to claim 15.

21. The second surface of the conductive plate is formed flat. The energy storage element according to any one of claims 15 to 20.

22. The tab is connected to at least a portion of the conductive plate portion facing the conductive shaft portion. The energy storage element according to any one of claims 15 to 21.

23. one end and the other end of the conductive plate portion protrude from one side end and the other side end of the external terminal in a surface direction of the cover plate in a cross-sectional view, The tab is connected to the conductive plate portion from a portion of the conductive plate portion that protrudes from one side end of the external terminal to a portion of the conductive plate portion that protrudes from the other side end of the external terminal.

23. The energy storage element according to claim 15.

24. The device further comprises an electrically insulating member disposed between the cover plate and the conductive plate portion in a direction perpendicular to the surface direction of the cover plate, The size of the conductive plate portion in the surface direction of the cover plate is smaller than the size of the electrically insulating member in the surface direction of the cover plate. The energy storage element according to any one of claims 15 to 23.

Images