JP2014110219A - Battery pack and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which electric cells can be surely connected to one another irrespective of bending precision of electrode tabs and positional displacement of the electrode tabs, and a method of manufacturing the same.SOLUTION: A battery pack 10 is constructed by stacking plural flat single cells 102 each of which has a power generating element 102a sealed in an outer package 102b and a plate-like electrode tab 102c which is connected to the power generating element from the inside of the outer package 102 and led out to the outside of the outer package 102. The battery pack has a conductive member 104 having a connection portion 104a which extends in parallel to the electrode tab of the single cell and is connected to the electrode tab, and an extension portion 104b which is connected to the connection portion 104a and extends at the outside of the tip of the electrode tab in the stack direction of the single cells. The battery pack has a bus bar 121 for connecting the extension portions of the conductive members adjacent to each other in the stack direction.

Description

  The present invention relates to an assembled battery and a method for manufacturing the assembled battery.

  There is known an assembled battery in which a plurality of flat unit cells in which a power generation element is sealed in an exterior body and a plate-like electrode tab connected to the power generation element is led out of the exterior body are stacked. The electrode tabs of the stacked unit cells are electrically connected. For example, in the battery pack described in Patent Document 1, for miniaturization, the electrode tabs of the stacked unit cells are bent in a substantially L shape in the stacking direction and the ends of the bent portions of the electrode tabs of adjacent unit cells are directly connected to each other. By joining, the protrusion amount of the connection part of an electrode tab is reduced. In the assembled battery having such a configuration, the ends of the bent portions of the electrode tabs must be in surface contact with each other when the electrode tabs are joined to each other.

JP 2004-63347 A

  However, the positional accuracy of the mating surfaces of the electrode tabs is the accumulation of misalignment of the electrode tabs in the stacking direction due to the accuracy in bending the electrode tabs, the misalignment in the extending direction of the electrode tabs, and the unit cell thickness dimension error Therefore, highly accurate positioning is difficult. In addition, in order to perform highly accurate alignment, sufficient attention must be paid to the accuracy of bending and forming the electrode tabs, the dimensional accuracy of the unit cells, and so on, so that the productivity is poor.

  The present invention has been made to solve such problems, and provides an assembled battery and a method of manufacturing the assembled battery that can reliably connect single cells regardless of the bending accuracy of the electrode tab and the positional deviation of the electrode tab. The purpose is to do.

  In order to achieve the above object, the assembled battery of the present invention is a flat single unit in which a power generation element is sealed inside an exterior body and a plate-like electrode tab connected to the power generation element from the interior of the exterior body is led out of the exterior body. It has a configuration in which a plurality of batteries are stacked. The assembled battery of the present invention includes a connecting portion that extends in parallel with the electrode tab of the unit cell and to which the electrode tab is connected, and an extending portion that is connected to the connecting portion and extends from the outside of the tip of the electrode tab in the unit cell stacking direction. And a conductive member. The assembled battery of this invention is provided with the bus bar which connects between the extension parts of the electrically-conductive member adjacent in a lamination direction.

  In order to achieve the above object, the battery pack manufacturing method of the present invention seals the power generation element inside the exterior body and leads out the plate-like electrode tab connected to the power generation element from the exterior body to the outside of the exterior body. It is a manufacturing method of an assembled battery formed by stacking a plurality of flat unit cells. The assembled battery manufacturing method of the present invention includes a connection portion extending in parallel with the electrode tab of the unit cell, and extending in a direction substantially orthogonal to the connection portion from the outside of the tip of the electrode tab while being connected to the connection portion. And an electrode tab connection step of connecting the electrode tab of the unit cell to the connection portion of the conductive member. The manufacturing method of the assembled battery of this invention has a bus bar connection process which connects the bus bar arrange | positioned between the extension parts of the electrically-conductive member adjacent to the lamination direction of the laminated | stacked single battery to an extension part.

  In the assembled battery and the method for manufacturing the assembled battery of the present invention, the electrode tab is connected to a connection portion extending in parallel with the electrode tab. For this reason, even if there is a positional shift in the extending direction of the electrode tab, the electrode tab and the connecting portion are connected by shifting the position in the extending direction according to the positional shift of the electrode tab. Therefore, according to the assembled battery and the assembled battery manufacturing method of the present invention, the unit cells can be reliably connected regardless of the positional deviation in the extending direction of the electrode tab.

  Moreover, in the assembled battery and the manufacturing method of the assembled battery according to the present invention, the unit cells to be stacked are connected to each other via an extending portion extending in the stacking direction and a bus bar connected to the extending portion. For this reason, it is not necessary to bend an electrode tab in order to connect single cells. Further, even if the electrode tabs are misaligned in the stacking direction, the electrode tabs are connected to each other via the extending portion and the bus bar that are connected by shifting the positions in the stacking direction according to the misalignment of the electrode tabs. Therefore, according to the assembled battery and the assembled battery manufacturing method of the present invention, the unit cells can be reliably connected regardless of the bending accuracy of the electrode tab and the positional deviation in the stacking direction.

It is a perspective view of the assembled battery of embodiment. It is a perspective view which decomposes | disassembles and shows the assembled battery of embodiment. It is a perspective view of the battery module of an embodiment. It is a perspective view which decomposes | disassembles and shows the battery module of embodiment. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. It is sectional drawing which decomposes | disassembles and shows the members shown by FIG. It is a perspective view which removes and shows a bus bar and a bus bar holding plate from a battery module group. It is sectional drawing which follows the 8-8 line | wire of FIG. It is a flowchart which shows the manufacturing method of the assembled battery of embodiment. FIG. 9 is a cross-sectional view corresponding to FIG. 8 illustrating a main part of a battery pack according to Modification 1. FIG. 6 is a cross-sectional view of a main part of a frame member and a conductive member of an assembled battery according to Modification 1; It is sectional drawing corresponding to FIG. 8 which shows the principal part of the assembled battery of the modification 2. FIG. 9 is a cross-sectional view corresponding to FIG. 8 illustrating a main part of an assembled battery according to Modification 3. It is sectional drawing corresponding to FIG. 8 which shows the principal part of the other example of the assembled battery of embodiment. It is sectional drawing corresponding to FIG. 8 which shows the principal part of the further another example of the assembled battery of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the dimension ratio of drawing is exaggerated on account of description, and is different from an actual ratio.

  As illustrated in FIGS. 1 and 2, the assembled battery 10 according to the embodiment includes a battery module group 100 including a plurality of stacked battery modules 101, and a holding plate 110 that holds the battery module group 100. . The assembled battery 10 includes a side plate 120 that electrically connects the battery modules 101 to each other.

  The holding plate 110 includes an upper plate 111 that is provided above the battery module group 100 and holds the battery module group 100, and a lower plate 112 that places and holds the battery module group 100. The assembled battery 10 includes a fastening bolt 113 that fastens the upper plate 111 and the lower plate 112. A hole 114 through which the fastening bolt 113 can be inserted is provided in the upper plate 111. A screw hole 115 into which the fastening bolt 113 is screwed is provided in the lower plate 112.

  As shown in FIGS. 3 and 4, the battery module 101 includes a unit cell 102 having a flat shape and a frame member 103 on which the unit cell 102 is placed. The battery module 101 has two unit cells 102. The unit cell 102 is placed on each of the front and back surfaces of the frame member 103 in the stacking direction. A hole 103 a through which the fastening bolt 113 passes is provided in the frame member 103.

  The unit cell 102 seals the power generation element 102a to be charged and discharged inside the exterior body 102b and leads the plate-like electrode tab 102c connected to the power generation element 102a from the inside of the exterior body 102b to the outside of the exterior body 102b. The configuration is as follows. The unit cell 102 is, for example, a lithium ion secondary battery.

  The exterior body 102b is, for example, a laminate film. For example, the laminate film has a configuration in which an aluminum foil is laminated between a resin film and a resin film. The power generation element 102a has a configuration in which a positive electrode and a negative electrode are stacked via an electrolyte layer. The electrode tab 102c is led out from each of the opposing side edges of the main body having a rectangular shape of the unit cell 102. One of the derived electrode tabs 102c is a positive electrode, and the other is a negative electrode. The positive electrode is made of aluminum, for example. The negative electrode is made of, for example, copper. The battery module 101 includes a conductive member 104 that is electrically connected to the electrode tab 102c. The conductive member 104 is made of copper, for example.

  As shown in FIG. 5, the conductive member 104 has a connection portion 104a that extends substantially parallel to the electrode tab 102c and connects to the electrode tab 102c, and is connected to the connection portion 104a and stacked from the outside of the tip of the electrode tab 102c. Extending part 104b. The conductive member 104 is connected to the frame member 103 by an adhesive, for example.

  As shown in FIG. 6, the frame member 103 has a mounting surface 103b along the electrode tab 102c of the unit cell 102 and an outer peripheral surface 103c along the stacking direction. The connection portion 104a of the conductive member 104 is disposed on the placement surface 103b. The extending portion 104b of the conductive member 104 is disposed on the outer peripheral surface 103c. The frame member 103 is made of, for example, reinforced plastic.

  The connecting portions 104a are disposed on the placement surfaces 103b on the front and back of the frame member 103 in the stacking direction. These two connection portions 104a are respectively connected to the electrode tabs 102c adjacent to each other on the front and back of the frame member 103 in the stacking direction. The extending part 104b is connected to these two connecting parts 104a. The conductive member 104 electrically connects the two unit cells 102 placed on the front and back surfaces of the frame member 103 in the stacking direction.

  The two electrode tabs 102c to which the conductive member 104 is connected have the same polarity. Two unit cells 102 placed on the front and back surfaces of the frame member 103 in the stacking direction are electrically connected in parallel by the conductive member 104 to form a parallel body.

  As illustrated in FIG. 7, the side plate 120 includes a conductive bus bar 121 and a bus bar holding plate 122 that holds the bus bar 121. The bus bar 121 is made of copper, for example. The bus bar holding plate 122 is made of plastic, for example.

  The bus bar holding plate 122 integrally holds the plurality of bus bars 121. The bus bar holding plate 122 has a flange 123 that is hooked on the edge of the bus bar 121 and holds the bus bar 121. An insertion hole 124 through which the conductive member 104 and the electrode tab 102 c can be inserted is provided in the bus bar holding plate 122. The flange portion 123 holds each bus bar 121 so as to face two insertion holes 124 adjacent in the stacking direction. The bus bar holding plate 122 has an insulating property.

  As shown in FIG. 8, the bus bar 121 connects between the extended portions 104 b of the conductive members 104 adjacent in the stacking direction. Bus bar 121 is joined to extending portion 104b. The bus bar 121 includes one parallel body in which two unit cells 102 are electrically connected in parallel by the conductive member 104, and two unit cells 102 electrically in parallel by the conductive member 104, which are adjacent to each other in the stacking direction. The other connected parallel bodies are electrically connected in series.

  A method for manufacturing the assembled battery 10 will be described.

  As shown in FIG. 9, the method of manufacturing the assembled battery 10 includes a cell mounting process for mounting the cell 102 on the frame member 103, and an electrode tab on the connecting portion 104a of the conductive member 104 after the cell mounting process. An electrode tab connecting step for connecting 102c. The manufacturing method of the assembled battery 10 includes a stacking step of stacking the cells 102 after the electrode tab connection step, a holding plate fastening step of fastening the holding plate 110 after the stacking step, and a holding plate fastening step, and then adjacent to the stacking direction. A bus bar connecting step of connecting the bus bar 121 to the extending portion 104b.

  In the unit cell placing step, the unit cell 102 is placed on and joined to the frame member 103. The unit cell 102 is placed on and joined to the front and back surfaces of the frame member 103. The unit cell 102 is joined to the frame member 103 by an adhesive applied to the frame member 103. The adhesive is applied to the portion of the frame member 103 where the edge of the main body of the unit cell 102 is in contact. An adhesive may be applied to the edge of the main body of the unit cell 102.

  In the electrode tab connection step, the electrode tabs 102c of the unit cells 102 that are stacked by being placed on the front and back surfaces of the frame member 103 are connected to the two connection portions 104a of the conductive member 104, respectively. The two electrode tabs 102c connected to the conductive member 104 have the same polarity. The electrode tab 102c is joined to the connection part 104a by, for example, locally irradiating it with a laser.

  In the stacking step, the unit cells 102 are stacked by stacking the frame members 103 on which the unit cells 102 are placed. The plurality of single cells 102 are stacked such that two positive electrodes connected by the conductive member 104 and two negative electrodes connected by the conductive member 104 are adjacent to each other in the stacking direction. The unit cell 102 is stacked on the lower plate 112. The screw hole 115 of the lower plate 112 and the hole 103a of the frame member 103 are aligned. The frame members 103 are stacked while aligning the positions of the holes 103a.

  After the desired number of unit cells 102 are stacked to form the battery module group 100, the upper plate 111 is placed on the battery module group 100. The hole 114 of the upper plate 111 and the hole 103a of the frame member 103 are aligned.

  In the holding plate fastening step, the holding plate 110 is fastened by fastening the fastening bolt 113. The fastening bolt 113 is passed through the hole 114 of the upper plate 111 and the hole 103 a of the frame member 103 and is screwed into the screw hole 115 of the lower plate 112.

  In the bus bar connecting step, each of the plurality of bus bars 121 is disposed and joined so as to face two extending portions 104b adjacent in the stacking direction. Each of the conductive members 104 arranged in the stacking direction is inserted into each of the insertion holes 124 of the bus bar holding plate 122, so that the extending portion 104b and the bus bar 121 face each other.

  The bus bar holding plate 122 is connected to the battery module group 100 before the extension portion 104b and the bus bar 121 are joined. The bus bar holding plate 122 is pressed against the battery module group 100 while the conductive member 104 and the electrode tab 102 c are inserted through the insertion hole 124. In this state, the bus bar holding plate 122 is joined to the battery module group 100 by, for example, applying ultrasonic waves to a contact portion with the frame member 103 and welding them.

  There is a gap in the stacking direction between the bus bar 121 and the flange 123 of the bus bar holding plate 122. By this configuration, the flange 123 holds the bus bar 121 so as to be swingable in the stacking direction. For this reason, even after the bus bar holding plate 122 is connected to the battery module group 100, the position of the bus bar 121 in the stacking direction can be adjusted before connecting the bus bar 121 and the extending portion 104b.

  Further, a gap is left between the bus bar 121 and the flange 123 in a direction substantially orthogonal to the surface of the bus bar 121 (extending direction of the electrode tab 102c). With this configuration, the flange 123 holds the bus bar 121 so as to be swingable in a direction substantially orthogonal to the surface of the bus bar 121. For this reason, even after the bus bar holding plate 122 is connected to the battery module group 100, the position of the bus bar 121 in the direction substantially orthogonal to the surface of the bus bar 121 can be adjusted before connecting the bus bar 121 and the extending portion 104b. . The bus bar 121 is joined to the extending portion 104b by, for example, locally irradiating it with a laser to melt it.

  The operations in the above steps may be performed manually by the operator, or may be performed automatically by an industrial robot or the like.

  The effect of this embodiment is described.

  In the assembled battery 10 and the method for manufacturing the assembled battery 10, the electrode tab 102c is connected to a connection portion 104a extending in parallel with the electrode tab 102c. Therefore, even if the electrode tab 102c is displaced in the extending direction, the electrode tab 102c and the connecting portion 104a are connected by shifting the position in the extending direction according to the displacement of the electrode tab 102c. Therefore, the assembled battery 10 and the manufacturing method of the assembled battery 10 can reliably connect the unit cells 102 regardless of the positional deviation in the extending direction of the electrode tab 102c.

  Further, in the assembled battery 10 and the method for manufacturing the assembled battery 10, the stacked unit cells 102 are connected to each other via the extending portion 104b extending in the stacking direction and the bus bar 121 connected thereto. For this reason, it is not necessary to bend the electrode tab 102c in order to connect the cells 102 to each other. Further, even if the electrode tab 102c is misaligned in the stacking direction, the electrode tabs 102c are connected to each other via the extended portion 104b and the bus bar 121 that are connected by shifting the position in the stacking direction according to the position shift of the electrode tab 102c. Connecting. Therefore, the assembled battery 10 and the manufacturing method of the assembled battery 10 can reliably connect the unit cells 102 regardless of the bending accuracy of the electrode tab 102c and the positional deviation in the stacking direction.

  In addition, since the unit cells 102 can be reliably connected regardless of the positional deviation of the electrode tab 102c, a requirement for positional accuracy can be set low, and thus productivity is improved.

  Unlike the present embodiment, when the electrode tab 102c is bent and overlapped and joined without using the conductive member 104 and the bus bar 121, the clamp jig that holds the electrode tabs 102c while being overlapped at the time of joining. is necessary. For this reason, a space for arranging the clamp jig must be provided around the unit cell 102, for example, between the mating surface of the electrode tabs 102c bent in the stacking direction and the main body of the unit cell 102. As a result, the assembled battery 10 may be increased in size. On the other hand, in the present embodiment, since the electrode tab 102c is connected via the conductive member 104 and the bus bar 121, it is not necessary to use such a clamping jig, and thus the battery pack 10 can be downsized.

  In the assembled battery 10 and the method for manufacturing the assembled battery 10, the electrode tabs 102c adjacent to each other in the stacking direction of the unit cells 102 placed on the front and back surfaces of the frame member 103 are connected by two extending portions 104b. Connected to each of 104a. For this reason, even if there is a relative displacement in the extending direction between the two electrode tabs 102c adjacent in the stacking direction, the two electrode tabs 102c are displaced from each other in the extending direction. And connected to each other via the extension 104b. Therefore, the assembled battery 10 and the manufacturing method of the assembled battery 10 can reliably connect two unit cells 102 adjacent in the stacking direction regardless of the positional deviation in the extending direction of the electrode tab 102c. In addition, since the unit cells 102 can be reliably connected regardless of the positional deviation of the electrode tab 102c, it is possible to reduce the requirement for positional accuracy. Therefore, a cell unit in which two unit cells 102 are stacked and electrically connected can be easily obtained. Can be formed. In particular, in this embodiment, since the two unit cells 102 are connected by the electrode tab 102c of the same polarity by the conductive member 104, a parallel body can be easily formed.

  In the assembled battery 10 and the manufacturing method of the assembled battery 10, the unit cell 102 is placed on the frame member 103, and the electrode tab 102 c is connected to the conductive member 104 provided on the frame member 103. With this configuration, the unit cell 102, particularly the electrode tab 102 c that is particularly susceptible to external force, the edge of the unit cell 102, and the conductive member 104 are protected from external force by the frame member 103 having excellent rigidity. Easy handling during assembly and transport.

  In the assembled battery 10 and the method for manufacturing the assembled battery 10, the unit cells 102 are placed and connected to the front and back surfaces of the frame member 103 in the stacking direction. For this reason, when the single frame member 103 is stacked, the two unit cells 102 are stacked at a time, so that the unit cells 102 can be stacked efficiently.

<Modification 1>
As shown in FIGS. 10 and 11, the assembled battery 20 of Modification 1 has a recess 203 a on the mounting surface 103 b of the frame member 203 and a protrusion 204 a in which the conductive member 204 fits into the recess 203 a. This is different from the above-described embodiment. Regarding the other configuration and the method of manufacturing the assembled battery 20, the first modification is substantially the same as the above embodiment. The same reference numerals are used in FIGS. 10 and 11 for configurations common to the above-described embodiment, and redundant descriptions are omitted here.

  The convex portion 204a is caught by the concave portion 203a. For this reason, in addition to the effect of the said embodiment, the assembled battery 20 of the modification 1 and the manufacturing method of the assembled battery 20 have the effect that the drop-off | omission of the electrically-conductive member 204 from the frame member 203 can be prevented more reliably.

<Modification 2>
As shown in FIG. 12, the conductive member 304 of the assembled battery 30 of Modification 2 has a connection portion 304 a and an extension portion 304 b having different thicknesses. The connecting portion 304a is thinner than the extending portion 304b. In FIG. 12, the thickness of the extended portion 304b is exaggerated and described as being thick, but the thickness of the extended portion 304b is substantially the same as that of the extended portion 104b of the first modification. Regarding other configurations and the method of manufacturing the assembled battery 30, the second modification is substantially the same as the first modification. The same components as those in the first modification are denoted by the same reference numerals in FIG. 12, and redundant descriptions are omitted here.

  The positive electrode tab 102c is formed of, for example, an aluminum thin plate having a thickness of about 0.2 mm. The negative electrode tab 102c is formed of, for example, a thin copper plate having a thickness of about 0.2 mm. When the electrode tab 102c having such a thickness is joined by laser welding, a high-power welding machine is not required. For this reason, even if the connection part 304a is thin, there is little possibility that a laser beam will penetrate the connection part 304a.

  Since the connecting portion 304a is formed thinner than the extending portion 304b, the assembled battery 30 and the manufacturing method of the assembled battery 30 according to the modified example 2 are not limited to the effects of the modified example 1, and the material for forming the connecting portion 304a, for example, copper There is an effect that the cost can be reduced and the weight can be reduced by reducing the amount of use.

<Modification 3>
As shown in FIG. 13, the assembled battery 40 of Modification 3 is different from Modification 2 in that the bus bar 421 is fastened to the extending portion 404b by a bolt 404a. The other configuration and the manufacturing method of the assembled battery 40 are substantially the same as the second modification. The same components as those of the second modification are denoted by the same reference numerals in FIG. 13, and redundant descriptions are omitted here.

  The bus bar 421 has a hole through which the bolt 404a can be inserted. The conductive member 404 has a screw hole in the extending portion 404b into which the bolt 404a can be screwed. The frame member 403 has a recess in which the front end side of the bolt 404a is received. The hole through which the bolt 404a provided in the bus bar 421 has a long hole shape having a relatively large size in the stacking direction. For this reason, even if the position of the screw hole provided in the extending part 404b is shifted in the stacking direction, the bolt 404a can be screwed.

  In the third modification, the bus bar 421 is fastened to the extending portion 404b by the bolt 404a. Therefore, it is not necessary to introduce an expensive welding machine that connects the bus bar 421 and the extending portion 404b by welding. Therefore, the assembled battery 40 and the manufacturing method of the assembled battery 40 according to the modified example 3 have an effect that the cost can be reduced in addition to the effect of the modified example 2.

  The present invention is not limited to the above-described embodiments and modifications, and various modifications can be made within the scope of the claims.

  For example, the present invention includes an assembled battery 50 in which the unit cell 102 is placed on only one of the front and back surfaces in the stacking direction of the frame member 103 as shown in FIG. In this example, the conductive member 504 has one connection portion 504a. The extending portion 504b is connected to the connecting portion 504a and extends in the stacking direction. The bus bar 121 is connected to the extending part 504b.

  Further, the conductive member is not limited to a plate-like member, and may be, for example, a block-like member as indicated by reference numeral 604 in FIG. The conductive member 604 has a solid rectangular parallelepiped shape. One surface of the conductive member 604 parallel to the electrode tab 102c constitutes a connecting portion, and the other surface perpendicular to this surface and extending in the stacking direction constitutes an extending portion. The bus bar 121 is connected to the other surface. The frame member 603 has a notch to which the conductive member 604 is attached.

  Moreover, this invention includes the form without a frame member.

  Moreover, in the said embodiment, although the cell mounted in the lamination direction front and back of a frame member was electrically connected in parallel, it is not limited to this, It is mounted in the lamination direction front and back of a frame member. The present invention includes a configuration in which the single cells are electrically connected in series. A circuit to be formed by electrically connecting a plurality of unit cells to be stacked by a conductive member and a bus bar can be appropriately set in consideration of, for example, the output and capacity of the assembled battery.

  Moreover, in the cell of the said embodiment, although the electrode tab is derived | led-out from each of the two opposing edges of the main body which has the rectangular shape of a cell, it is not limited to this. The unit cell may have a configuration in which two electrode tabs of a positive electrode and a negative electrode are derived from one end side of a main body having a rectangular shape of the unit cell.

10, 20, 30, 40, 50, 60 battery pack,
100 battery module group,
101 battery module,
102 cell,
102a power generation element,
102b exterior body,
102c electrode tab,
103 frame member,
103a hole,
103b mounting surface,
103c outer peripheral surface,
104 conductive member,
104a connection part,
104b extension,
110 holding plate,
111 upper plate,
112 Lower plate,
113 fastening bolts,
114 holes,
115 screw holes,
120 side plate,
121, 421 Bus bar,
122 bus bar holding plate,
123 Buttocks,
124 insertion hole,
203 frame member,
203a recess,
204 conductive member,
204a convex part,
304 conductive member,
304a connection part,
304b extension,
403 frame member,
404 conductive member,
404a bolt,
404b extension,
504 conductive member,
504a connection,
504b extension,
603 frame member,
604 Conductive member.

Claims (13)

An assembled battery formed by laminating a plurality of flat unit cells in which a power generation element is sealed inside an exterior body and plate-like electrode tabs connected to the power generation element from the interior of the exterior body are led out to the exterior body Because
A connection portion extending in parallel with the electrode tab of the unit cell and connected to the electrode tab; and an extension portion connected to the connection portion and extending from the outside of the tip of the electrode tab in the stacking direction of the unit cell A conductive member comprising:
An assembled battery comprising: a bus bar that connects between the extending portions of the conductive members adjacent to each other in the stacking direction.   2. The assembled battery according to claim 1, wherein the conductive member includes two connection portions respectively connected to the electrode tabs adjacent to each other in the stacking direction, and the extension portion is connected to the two connection portions. . A frame member on which the unit cell is placed;
The frame member includes a mounting surface along the electrode tab of the unit cell mounted and an outer peripheral surface along the stacking direction, and the unit cell stacks the frame member on which the unit cell is mounted. Are stacked by
3. The conductive member according to claim 1, wherein the conductive member is provided on the placement surface of the frame member, and the extending portion is provided on the outer peripheral surface of the frame member. Assembled battery. The unit cell is placed on each of the front and back surfaces of the frame member in the stacking direction,
The conductive member includes two connection portions provided on the front and back surfaces in the stacking direction of the frame member, and the extension portion provided on the outer peripheral surface of the frame member and connected to the two connection portions. 4. The assembled battery according to claim 3, wherein the two unit cells placed on the front and back surfaces in the stacking direction of the frame member are electrically connected.   The conductive member electrically connects the two unit cells by connecting the two connection portions to the electrode tabs of the same polarity of the two unit cells respectively mounted on the front and back surfaces of the frame member in the stacking direction. The assembled battery according to claim 4, which is connected in parallel to form a parallel body.   The assembled battery according to any one of claims 3 to 5, wherein a concave portion is provided on the mounting surface of the frame member, and the conductive member includes a convex portion that fits into the concave portion.   The assembled battery according to claim 1, wherein the connection part and the extension part have a plate shape, and the connection part is thinner than the extension part.   The assembled battery according to any one of claims 1 to 7, wherein the bus bar is fastened to the extension portion of the conductive member by a bolt. An assembled battery formed by laminating a plurality of flat unit cells in which a power generation element is sealed inside an exterior body and plate-like electrode tabs connected to the power generation element are led out from the exterior body to the exterior of the exterior body A manufacturing method of
A connecting portion extending in parallel with the electrode tab of the unit cell; and an extending portion connected to the connecting portion and extending in a direction substantially orthogonal to the connecting portion from the outside of the tip of the electrode tab. An electrode tab connection step of connecting the electrode tab of the unit cell to the connection portion of the conductive member;
A bus bar connecting step of connecting the bus bar disposed between the extending portions of the conductive members adjacent to each other in the stacking direction of the stacked unit cells after the electrode tab connecting step; A method for producing an assembled battery.   The conductive member includes two substantially parallel connecting portions and the extending portion connected to the two connecting portions, and in the electrode tab connecting step, the electrode tabs of the unit cells stacked and adjacent to each other are The method for manufacturing an assembled battery according to claim 9, wherein the method is connected to each of the two connection portions. Before the electrode tab connection step, the unit cell is stacked with the unit cell, and has a unit cell mounting step of mounting on the frame member provided with the conductive member,
In the electrode tab connection step, the electrode tab is connected to the connection portion of the conductive member provided on the mounting surface of the frame member along the electrode tab,
The said bus bar is connected to the said extension part of the said electrically-conductive member provided in the outer peripheral surface of the said frame member along the lamination direction of the said unit cell laminated | stacked in the said bus bar connection process. Item 11. A method for producing an assembled battery according to Item 10. The conductive member includes two connection portions provided on front and back surfaces of the frame member substantially parallel to each other, and the extension provided on the outer peripheral surface of the frame member and connected to the two connection portions. And
In the unit cell placing step, the unit cell is placed on each of the front and back surfaces of the frame member,
In the electrode tab connection step, the two unit cells placed on the front and back surfaces of the frame member are connected to the two connection portions of the conductive member by the electrode tab. The manufacturing method of the assembled battery of Claim 11 electrically connected.   In the electrode tab connection step, the electrode tabs of the same polarity of each of the two unit cells placed on the front and back surfaces of the frame member in the stacking direction are connected to the two connection portions of the conductive member, The method for manufacturing an assembled battery according to claim 12, wherein the two cells are electrically connected in parallel to form a parallel body.

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