Power storage cell

Abstract

To provide a power storage cell capable of suppressing the increase in electric resistance.SOLUTION: A power storage cell includes a first cell unit 101 and a second cell unit 102, and a reinforcement part 510 that reinforces a connection part between the first cell unit and the second cell unit. Each cell unit includes at least one electrode body, a laminate exterior body 160, and a current collecting terminal 140 projecting from the laminate exterior body. The current collecting terminal 140 of the first cell unit 101 is connected to the current collecting terminal 140 of the second cell unit 102. The reinforcement part 510 is fixed to a connection part between the current collecting terminal 140 of the first cell unit 101 and the current collecting terminal 140 of the second cell unit 102, and extends to reach an edge part 162 of the laminate exterior body in the second cell unit 102 from the edge part 162 of the laminate exterior body in the first cell unit 101.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an energy storage cell. [Background technology]

[0002] For example, JP 2023-509216 A discloses a battery including a plurality of electrode body sets and a case for housing the plurality of electrode body sets. The plurality of electrode body sets are connected in series to each other by a first connecting member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-509216 Summary of the Invention [Problem to be solved by the invention]

[0004] In the battery described in JP-A-2023-509216, the connection between the electrode body set and the first connection member may partially peel off due to vibration or the like, and in this case, the electrical resistance increases.

[0005] An object of the present disclosure is to provide an energy storage cell that can suppress an increase in electrical resistance. [Means for solving the problem]

[0006] A storage cell according to one aspect of the present disclosure comprises a first cell unit, a second cell unit connected to the first cell unit, and a reinforcing portion reinforcing the connection between the first cell unit and the second cell unit, wherein each of the first cell unit and the second cell unit includes at least one electrode body, a laminated exterior body covering the at least one electrode body, and a collector terminal electrically connected to the at least one electrode body and protruding from the laminated exterior body, wherein the laminated exterior body has an edge, the collector terminal protrudes from the edge, the collector terminal of the first cell unit is connected to the collector terminal of the second cell unit, and the reinforcing portion is fixed to the connection between the collector terminal of the first cell unit and the collector terminal of the second cell unit and extends from the edge of the laminated exterior body of the first cell unit to the edge of the laminated exterior body of the second cell unit. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide an energy storage cell that can suppress an increase in electrical resistance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view schematically illustrating a storage cell according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is an exploded perspective view of the storage cell shown in FIG. [Figure 3] FIG. 2 is an exploded perspective view of a cell unit. [Figure 4] FIG. 2 is a front view of the storage cell. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 4 is a front view schematically showing the vicinity of a protruding portion of a current collecting terminal. [Figure 8] FIG. 10 is a cross-sectional view schematically showing a modified example of the current collecting terminal. [Figure 9] FIG. 10 is a cross-sectional view schematically showing a modified example of the current collecting terminal. [Figure 10] FIG. 10 is a cross-sectional view schematically showing a modified example of the current collecting terminal. [Figure 11] FIG. 10 is a cross-sectional view schematically showing a modified example of the current collecting terminal. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding elements are designated by the same reference numerals.

[0010] Fig. 1 is a perspective view schematically showing a storage cell according to an embodiment of the present disclosure. Fig. 2 is an exploded perspective view of the storage cell shown in Fig. 1. Fig. 3 is an exploded perspective view of a cell unit. Fig. 4 is a front view of the storage cell. Fig. 5 is a cross-sectional view taken along line VV in Fig. 4. Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 4. This storage cell 1 is mounted, for example, on the bottom of a vehicle.

[0011] 1 to 6, the energy storage cell 1 includes a plurality of cell units 100, a covering sheet 200 (see FIGS. 5 and 6), a cell case 300, an external terminal 400, a first reinforcing portion 510, and a second reinforcing portion 520. Note that the covering sheet 200 is not shown in FIG. 2.

[0012] The multiple cell units 100 include a first cell unit 101, a second cell unit 102, a third cell unit 103, and a fourth cell unit 104. In this embodiment, the multiple cell units 100 include eight cell units 100. However, the number of cell units 100 is not limited to eight. Each cell unit 100 may be, for example, a lithium-ion battery. Each cell unit 100 may be formed of a so-called all-solid-state battery that includes a solid electrolyte.

[0013] The first cell unit 101 is connected to the second cell unit 102. The third cell unit 103 is connected to the fourth cell unit 104. The first cell unit 101 and the third cell unit 103 are adjacent to each other in a second direction that is perpendicular to both the first direction in which the first cell unit 101 and the second cell unit 102 are aligned and the vertical direction. The second cell unit 102 and the fourth cell unit 104 are adjacent to each other in the second direction. Each cell unit 100 has a shape that is longer in the first direction than in the second direction and that extends longer in the first direction than in the vertical direction. Each cell unit 100 has a shape that extends longer in the vertical direction than in the second direction.

[0014] Fig. 3 is an exploded perspective view of the cell unit 100. Each cell unit 100 has at least one electrode assembly 110, a spacer 120, a terminal member 130, a current collecting terminal 140, a cover 150, and a laminated exterior body 160. Note that the laminated exterior body 160 is not shown in Fig. 3. Also, the laminated exterior body 160 of the second cell unit 102 and the laminated exterior body 160 of the fourth cell unit 104 are not shown in Fig. 2.

[0015] At least one electrode body 110 includes two electrode bodies 110. However, the number of electrode bodies 110 is not limited to two. Each electrode body 110 is formed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, each electrode body 110 may be formed of a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The two electrode bodies 110 are adjacent to each other in the stacking direction (the vertical direction in FIG. 5) in which the positive electrode sheet and the negative electrode sheet are stacked on top of each other. Each electrode body 110 is formed in a shape that is elongated in an orthogonal direction that is orthogonal to both the stacking direction and the vertical direction. The stacking direction (thickness direction) corresponds to the second direction, and the orthogonal direction corresponds to the first direction.

[0016] Each electrode body 110 has a coated portion 112 and an electrode tab 114. The coated portion 112 is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where an active material layer is provided. The electrode tab 114 is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where no active material layer is provided, i.e., an uncoated portion where the electrode foil is exposed.

[0017] The spacer 120 is disposed between a pair of adjacent electrode tabs 114. The spacer 120 is made of an insulating material (synthetic resin, etc.). As shown in Figures 3 and 5, the spacer 120 has a shape in which the dimension in the stacking direction gradually increases as it moves away from the coated section 112 in the perpendicular direction.

[0018] The terminal members 130 are connected to the outer surfaces of the spacers 120 in the orthogonal direction. The terminal members 130 are made of a conductive material (metal such as copper or aluminum). As shown in Fig. 5, the terminal members 130 are connected to a pair of electrode tabs 114 adjacent to each other in the stacking direction.

[0019] The current collecting terminal 140 is connected to the terminal member 130. The current collecting terminal 140, which is electrically connected to the positive electrode tab 114 via the terminal member 130, is made of, for example, aluminum. The current collecting terminal 140, which is electrically connected to the negative electrode tab 114 via the terminal member 130, is made of, for example, copper. The current collecting terminal 140 has a connecting portion 142 and a protruding portion 144.

[0020] The connection portion 142 is connected to the outer surface of the terminal member 130 in the orthogonal direction by welding, etc. The connection portion 142 is formed in a flat plate shape.

[0021] The protrusion 144 protrudes outward in the perpendicular direction from the connection portion 142. The protrusion 144 is formed in a flat plate shape. As shown in FIG. 5 , the protrusion 144 of the current collector terminal 140 in the first cell unit 101 is connected to the protrusion 144 of the current collector terminal 140 in the second cell unit 102. Similarly, the protrusion 144 of the current collector terminal 140 in the third cell unit 103 is connected to the protrusion 144 of the current collector terminal 140 in the fourth cell unit 104.

[0022] The cover 150 covers the end of the electrode body 110 in the orthogonal direction, more specifically, the electrode tab 114. The cover 150 is made of an insulating material (synthetic resin, etc.). As shown in Figures 2, 3 and 5, the cover 150 has a through hole h through which the protrusion 144 is inserted.

[0023] The laminated exterior body 160 houses the electrode assemblies 110, the spacer 120, the terminal member 130, a portion of the current collecting terminal 140, and the cover 150. The laminated exterior body 160 is made of a laminated film. As shown in FIGS. 5 and 7, the laminated exterior body 160 has an edge portion 162. The edge portion 162 is formed by connecting (welding) laminated films together. The protrusion 144 protrudes outward in the orthogonal direction from the edge portion 162 of the laminated exterior body 160.

[0024] The covering sheet 200 (see FIGS. 5 and 6) covers the multiple cell units 100. More specifically, the covering sheet 200 covers the multiple cell units 100 so as to collectively surround these cell units 100. The covering sheet 200 is made of an insulating material (synthetic resin, etc.).

[0025] The cell case 300 houses a plurality of cell units 100 and a covering sheet 200. The cell case 300 is made of, for example, aluminum. The cell case 300 is formed in a rectangular parallelepiped shape that is elongated in a first direction. As shown in FIGS. 1 and 2, the cell case 300 has a case body 310 and a lid 320.

[0026] The case body 310 is formed in the shape of a rectangular tube that is long in the first direction. The case body 310 surrounds the multiple cell units 100 and the cover sheet 200.

[0027] The lid 320 is connected to the case body 310 by welding or the like so as to close the opening of the case body 310 .

[0028] The external terminal 400 is provided on the lid 320. The external terminal 400 is connected to the current collecting terminal 140 of the cell unit 100 that is positioned closest to the lid 320 among the multiple cell units 100.

[0029] The first reinforcing portion 510 reinforces the connection portion between the first cell unit 101 and the second cell unit 102. As shown in FIGS. 5 and 7, the first reinforcing portion 510 is fixed to the connection portion between the protrusion 144 of the first cell unit and the protrusion 144 of the second cell unit 102. The first reinforcing portion 510 is made of an insulating material (synthetic resin, etc.). The first reinforcing portion 510 has the function of increasing the bending rigidity of the protrusion 144 of the first cell unit and the protrusion 144 of the second cell unit 102. The thickness (dimension in the second direction) of the first reinforcing portion 510 may be set to be the same as or greater than the thickness (dimension in the second direction) of each protrusion 144. The first reinforcing portion 510 is an example of a "reinforcing portion" in the present disclosure. In FIG. 7, the protrusion 144 of the first cell unit 101 is shown by a dashed line, the protrusion 144 of the second cell unit 102 is shown by a dashed line, and the first reinforcing portion 510 is shown by a diagonal line.

[0030] As shown in Figure 5, the first reinforcing portion 510 covers the portion of the connection between the protrusion 144 of the first cell unit 101 and the protrusion 144 of the second cell unit 102 that faces the connection between the protrusion 144 of the collector terminal 140 in the third cell unit 103 and the protrusion 144 of the collector terminal 140 in the fourth cell unit 104.

[0031] 7, the first reinforcing portion 510 covers the entire area in the vertical direction of the connection portion between the protrusion 144 of the first cell unit 101 and the protrusion 144 of the second cell unit 102. The first reinforcing portion 510 extends from the edge portion 162 of the laminated exterior body 160 of the first cell unit 101 to the edge portion 162 of the laminated exterior body 160 of the second cell unit 102. The end portion of the first reinforcing portion 510 in the first direction may be in contact with the end surface 160s of the laminated exterior body 160, or may be spaced apart from the end surface 160s of the laminated exterior body 160.

[0032] The first reinforcing portion 510 is formed, for example, by connecting the protrusion 144 of the first cell unit 101 and the protrusion 144 of the second cell unit 102 to each other, and then applying an insulating material that forms the first reinforcing portion 510 to the connection portion.

[0033] The second reinforcing part 520 reinforces the connection between the third cell unit 103 and the fourth cell unit 104. As shown in FIG. 5, the second reinforcing part 520 is fixed to the connection between the protrusion 144 of the third cell unit and the protrusion 144 of the fourth cell unit 104. The second reinforcing part 520 is made of an insulating material (such as a synthetic resin). The second reinforcing part 520 is an example of an "other reinforcing part" in this disclosure.

[0034] As shown in FIG. 5, the second reinforcing part 520 covers the part of the connection between the protrusion 144 of the third cell unit 103 and the protrusion 144 of the fourth cell unit 104 that faces the first reinforcing part 510.

[0035] 7, the second reinforcing portion 520 covers the entire vertical area of ​​the connection portion between the protrusion 144 of the third cell unit 103 and the protrusion 144 of the fourth cell unit 104. The second reinforcing portion 520 extends from the edge 162 of the laminated exterior body 160 of the third cell unit 103 to the edge 162 of the laminated exterior body 160 of the fourth cell unit 104.

[0036] The second reinforcing portion 520 is formed, for example, by connecting the protrusion 144 of the third cell unit 103 and the protrusion 144 of the fourth cell unit 104 to each other, and then applying an insulating material that forms the second reinforcing portion 520 to the connection portion.

[0037] As described above, in the energy storage cell 1 of this embodiment, the connection between the current collector terminal 140 of the first cell unit 101 and the current collector terminal 140 of the second cell unit 102 is reinforced by the first reinforcing part 510, and the connection between the current collector terminal 140 of the third cell unit 103 and the current collector terminal 140 of the fourth cell unit 104 is reinforced by the second reinforcing part 520, thereby preventing peeling between these current collector terminals 140. This prevents an increase in electrical resistance.

[0038] Furthermore, since the first reinforcing portion 510 and the second reinforcing portion 520 are made of an insulating material, the occurrence of a short circuit caused by the connection portion between the collector terminal 140 of the first cell unit 101 and the collector terminal 140 of the second cell unit 102 coming into contact with the connection portion between the collector terminal 140 of the third cell unit 103 and the collector terminal 140 of the fourth cell unit 104 is suppressed.

[0039] Modifications of the above embodiment will now be described.

[0040] <First Modification> As shown in Figure 8, the protrusion 144 of the current collector terminal 140 may have a base 144a and a bent portion 144b. Note that Figure 8 only shows the areas near the current collector terminal 140 of the first cell unit 101 and the current collector terminal 140 of the second cell unit 102. The areas near the current collector terminal 140 of the third cell unit 103 and the current collector terminal 140 of the fourth cell unit 104 have a structure that is substantially symmetrical to the areas near the current collector terminal 140 of the first cell unit 101 and the current collector terminal 140 of the second cell unit 102 with respect to a plane that is perpendicular to the stacking direction and passes through the boundary between the first cell unit 101 and the third cell unit 103.

[0041] The base portion 144a projects outward from the connecting portion 142 in the perpendicular direction.

[0042] The bent portion 144b is bent relative to the base portion 144a. The bent portion 144b is bent outward in the stacking direction relative to the base portion 144a. The outer surface of the bent portion 144b of the first cell unit 101 in the orthogonal direction is connected to the outer surface of the bent portion 144b of the second cell unit 102 in the orthogonal direction.

[0043] The first reinforcing portion 510 covers the inner surface of the base portion 144a of the first cell unit 101 in the stacking direction and the inner surface of the base portion 144a of the second cell unit 102 in the stacking direction.

[0044] In this embodiment, the dimension between a pair of cell units 100 aligned in the first direction is reduced, and therefore the energy storage cell 1 can be made smaller.

[0045] <Second Modification> 9, the bent portion 144b may have a first bent portion 144b1 bent outward in the stacking direction relative to the base portion 144a, and a second bent portion 144b2 bent outward in a direction perpendicular to the first bent portion 144b1. In this example, the second bent portion 144b2 of the first cell unit 101 and the second bent portion 144b2 of the second cell unit 102 are connected to each other.

[0046] In this embodiment as well, the dimension between a pair of cell units 100 aligned in the first direction is reduced, thereby enabling miniaturization of the energy storage cell 1. Furthermore, movement of one of a pair of cell units 100 aligned in the first direction away from the other in the first direction is absorbed by deformation of the bent portions 144b1, 144b2 so that the angle between the base 144a and the first bent portion 144b1 and the angle between the first bent portion 144b1 and the second bent portion 144b2 become larger, thereby suppressing peeling between the collector terminals 140.

[0047] <Third Modification> As shown in Fig. 10, the protrusion 144 of the current collecting terminal 140 may have a base 144a and a folded portion 144c. The folded portion 144c is folded back relative to the base 144a. The folded portion 144c may be folded back either to the outside or inward in the stacking direction relative to the base 144a. In the example shown in Fig. 10, the outer surface of the folded portion 144c of the first cell unit 101 in the stacking direction is connected to the inner surface of the folded portion 144c of the second cell unit 102 in the stacking direction.

[0048] In the example shown in FIG. 10, the first reinforcing portion 510 covers the inner surface of the folded portion 144c of the second cell unit 102 in the stacking direction.

[0049] In this embodiment as well, the dimension between a pair of cell units 100 aligned in the first direction is reduced, and therefore the energy storage cell 1 can be made smaller.

[0050] <Fourth Modification> 11, the protrusion 144 of the current collecting terminal 140 may have a base 144a and a bellows portion 144d. The bellows portion 144d is connected to the base 144a. The bellows portion 144d is formed by folding back the portion of the protrusion 144 further forward than the base 144a multiple times so that it has a bellows shape. The outer surface of the bellows portion 144d of the first cell unit 101 in the orthogonal direction is connected to the outer surface of the bellows portion 144d of the second cell unit 102 in the orthogonal direction.

[0051] This embodiment also reduces the dimension between a pair of cell units 100 aligned in the first direction, thereby enabling miniaturization of the energy storage cell 1. Furthermore, movement of one of the pair of cell units 100 aligned in the first direction away from the other in the first direction is absorbed by the extension of the bellows portion, thereby preventing the current collecting terminals 140 from peeling off from each other.

[0052] It will be appreciated by those skilled in the art that the exemplary embodiments described above are examples of the following aspects.

[0053] [Aspect 1] a first cell unit; a second cell unit connected to the first cell unit; a reinforcing portion that reinforces the connection portion between the first cell unit and the second cell unit, Each of the first cell unit and the second cell unit comprises: At least one electrode body; a laminate exterior body covering the at least one electrode body; a current collecting terminal electrically connected to the at least one electrode body and protruding from the laminate exterior body, the current collecting terminal of the first cell unit is connected to the current collecting terminal of the second cell unit, The reinforcing portion is fixed to a connection portion between the current collector terminal of the first cell unit and the current collector terminal of the second cell unit.

[0054] In this energy storage cell, the connection between the current collector terminal of the first cell unit and the current collector terminal of the second cell unit is reinforced by the reinforcing portion, which prevents the current collector terminals from peeling apart, thereby preventing an increase in electrical resistance.

[0055] [Aspect 2] The laminate exterior body has an edge, The current collecting terminal protrudes from the edge portion, 2. The energy storage cell according to claim 1, wherein the reinforcing portion extends from the edge of the laminated exterior body of the first cell unit to the edge of the laminated exterior body of the second cell unit.

[0056] [Aspect 3] The current collecting terminal is a protrusion protruding from the laminate exterior body; 3. The energy storage cell according to claim 1, wherein the reinforcing portion has a thickness equal to or greater than a thickness of the protrusion.

[0057] In this embodiment, the reinforcing portion effectively increases the overall bending rigidity of the current collecting terminal and the reinforcing portion, thereby suppressing deformation of the protruding portion.

[0058] [Aspect 4] a third cell unit arranged adjacent to the first cell unit in a second direction perpendicular to a first direction in which the first cell unit and the second cell unit are aligned; a fourth cell unit disposed adjacent to the second cell unit in the second direction and connected to the third cell unit; another reinforcing portion that reinforces the connection portion between the third cell unit and the fourth cell unit, the reinforcing portion and the other reinforcing portion are made of an insulating material, Each of the third cell unit and the fourth cell unit comprises: At least one electrode body; a laminate exterior body covering the at least one electrode body; a current collecting terminal electrically connected to the at least one electrode body and protruding from the laminate exterior body, the current collecting terminal of the third cell unit is connected to the current collecting terminal of the fourth cell unit; the other reinforcing portion is fixed to a connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, the reinforcing portion covers a portion of a connection portion between the current collecting terminal of the first cell unit and the current collecting terminal of the second cell unit that faces a connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, The energy storage cell according to any one of aspects 1 to 3, wherein the other reinforcing portion covers a portion of a connection portion between the current collector terminal of the third cell unit and the current collector terminal of the fourth cell unit that faces the reinforcing portion.

[0059] In this energy storage cell, the connection between the third cell unit and the fourth cell unit is effectively reinforced by the other reinforcing part. Furthermore, because the reinforcing part and the other reinforcing part are made of insulating material, the occurrence of a short circuit caused by the connection between the current collector terminal of the first cell unit and the current collector terminal of the second cell unit coming into contact with the connection between the current collector terminal of the third cell unit and the current collector terminal of the fourth cell unit is suppressed.

[0060] [Aspect 5] The current collecting terminal is a base portion protruding from the laminate exterior body; a bent portion bent relative to the base portion, the bent portion of the first cell unit and the bent portion of the second cell unit are bent in a direction away from the connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, the bent portion of the third cell unit and the bent portion of the fourth cell unit are bent in a direction away from the connection portion between the current collecting terminal of the first cell unit and the current collecting terminal of the second cell unit, the bent portion of the current collecting terminal in the first cell unit and the bent portion of the current collecting terminal in the second cell unit are connected to each other, the bent portion of the current collecting terminal in the third cell unit and the bent portion of the current collecting terminal in the fourth cell unit are connected to each other, the reinforcing portion covers a portion of the base portion of the first cell unit and a portion of the base portion of the second cell unit that faces the other reinforcing portion; The energy storage cell according to aspect 4, wherein the other reinforcing portion covers a portion of the base of the third cell unit and a portion of the base of the fourth cell unit that faces the reinforcing portion.

[0061] In this embodiment, the dimension between a pair of cell units aligned in the first direction is reduced, making it possible to reduce the size of the power storage cell.

[0062] [Aspect 6] The current collecting terminal is a base portion protruding from the laminate exterior body; a folded portion folded back relative to the base portion, the folded portion of the current collecting terminal in the first cell unit and the folded portion of the current collecting terminal in the second cell unit are connected to each other, 5. The energy storage cell according to aspect 4, wherein the folded portion of the current collector terminal in the third cell unit and the folded portion of the current collector terminal in the fourth cell unit are connected to each other.

[0063] In this embodiment, the dimension between a pair of cell units aligned in the first direction is reduced, making it possible to reduce the size of the power storage cell.

[0064] [Aspect 7] The current collecting terminal is a base portion protruding from the laminate exterior body; a bellows portion connected to the base portion and formed in a bellows shape, an outer surface of the bellows portion of the first cell unit in the first direction is connected to an outer surface of the bellows portion of the second cell unit in the first direction; The energy storage cell of aspect 4, wherein an outer surface of the bellows portion of the third cell unit in the first direction is connected to an outer surface of the bellows portion of the fourth cell unit in the first direction.

[0065] In this embodiment, the dimension between a pair of cell units aligned in the first direction is reduced, making it possible to reduce the size of the power storage cell.

[0066] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0067] 1 storage cell, 100 cell unit, 101 first cell unit, 102 second cell unit, 103 third cell unit, 104 fourth cell unit, 110 electrode body, 112 coated portion, 114 electrode tab, 120 spacer, 130 terminal member, 140 current collecting terminal, 142 connection portion, 144 protrusion, 144a base portion, 144b folded portion, 144c folded portion, 144d bellows portion, 150 cover, 160 laminated outer casing, 162 edge portion, 200 covering sheet, 300 cell case, 310 case body, 320 lid, 400 external terminal, 510 first reinforcing portion (reinforcing portion), 520 second reinforcing portion (another reinforcing portion).

Claims

1. a first cell unit; a second cell unit connected to the first cell unit; a reinforcing portion that reinforces a connection portion between the first cell unit and the second cell unit, Each of the first cell unit and the second cell unit At least one electrode body; a laminate exterior body covering the at least one electrode body; a current collecting terminal electrically connected to the at least one electrode body and protruding from the laminate exterior body, The laminate exterior body has an edge, The current collecting terminal protrudes from the edge portion, the current collecting terminal of the first cell unit is connected to the current collecting terminal of the second cell unit, A storage cell wherein the reinforcing portion is fixed to the connection portion between the collector terminal of the first cell unit and the collector terminal of the second cell unit, and extends from the edge of the laminated outer casing of the first cell unit to the edge of the laminated outer casing of the second cell unit.

2. The current collecting terminal is a protrusion protruding from the laminate exterior body; The energy storage cell according to claim 1 , wherein the reinforcing portion has a thickness equal to or greater than a thickness of the protruding portion.

3. a third cell unit arranged adjacent to the first cell unit in a second direction perpendicular to a first direction in which the first cell unit and the second cell unit are aligned; a fourth cell unit disposed adjacent to the second cell unit in the second direction and connected to the third cell unit; another reinforcing portion that reinforces the connection portion between the third cell unit and the fourth cell unit, the reinforcing portion and the other reinforcing portion are made of an insulating material, Each of the third cell unit and the fourth cell unit At least one electrode body; a laminate exterior body covering the at least one electrode body; a current collecting terminal electrically connected to the at least one electrode body and protruding from the laminate exterior body, the current collecting terminal of the third cell unit is connected to the current collecting terminal of the fourth cell unit, the other reinforcing portion is fixed to a connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, the reinforcing portion covers a portion of a connection portion between the current collecting terminal of the first cell unit and the current collecting terminal of the second cell unit that faces a connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, The energy storage cell according to claim 1 , wherein the other reinforcing portion covers a portion of a connection portion between the current collector terminal of the third cell unit and the current collector terminal of the fourth cell unit that faces the reinforcing portion.

4. The current collecting terminal is a base portion protruding from the laminate exterior body; a bent portion bent relative to the base portion, the bent portion of the first cell unit and the bent portion of the second cell unit are bent in a direction away from the connection portion between the current collecting terminal of the third cell unit and the current collecting terminal of the fourth cell unit, the bent portion of the third cell unit and the bent portion of the fourth cell unit are bent in a direction away from the connection portion between the current collecting terminal of the first cell unit and the current collecting terminal of the second cell unit, the bent portion of the current collecting terminal of the first cell unit and the bent portion of the current collecting terminal of the second cell unit are connected to each other, the bent portion of the current collecting terminal of the third cell unit and the bent portion of the current collecting terminal of the fourth cell unit are connected to each other, the reinforcing portion covers a portion of the base portion of the first cell unit and a portion of the base portion of the second cell unit that faces the other reinforcing portion, The energy storage cell according to claim 3 , wherein the other reinforcing portion covers a portion of the base portion of the third cell unit and a portion of the base portion of the fourth cell unit that faces the reinforcing portion.

5. The current collecting terminal is a base portion protruding from the laminate exterior body; a folded portion folded back relative to the base portion, the folded portion of the current collecting terminal in the first cell unit and the folded portion of the current collecting terminal in the second cell unit are connected to each other, The energy storage cell according to claim 3 , wherein the folded portion of the current collector terminal in the third cell unit and the folded portion of the current collector terminal in the fourth cell unit are connected to each other.

6. The current collecting terminal is a base portion protruding from the laminate exterior body; a bellows portion connected to the base portion and formed in a bellows shape, an outer surface of the bellows portion of the first cell unit in the first direction is connected to an outer surface of the bellows portion of the second cell unit in the first direction; The energy storage cell according to claim 3 , wherein an outer surface of the bellows portion of the third cell unit in the first direction is connected to an outer surface of the bellows portion of the fourth cell unit in the first direction.

Images