Battery pack manufacturing method

Abstract

To improve a production efficiency of a battery pack by satisfactorily suppressing a joint failure between terminals of a plurality of battery cells and bus bars arranged in a lamination state in a case.SOLUTION: A manufacturing method of a battery pack comprises: laminating a plurality of battery cells having terminals arranged on one surfaces respectively so that the one surfaces are directed in the same direction, and compressing them from both sides; inserting the plurality of compressed battery cells into a case so that the one surfaces are positioned at an open end side of the case; arranging a plurality of bus bars so as to overlap them with the corresponded terminals onto the one surfaces of the plurality of battery cells; moving a compression tool from a compression start position in a manner to push the plurality of bus bars into a bottom surface side of the case from the compression start position in accordance with a height position of the terminal of each battery cell mostly separated from a bottom surface of the case; and bonding each of the plurality of bus bars to the corresponded terminal.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a method for manufacturing a battery pack that includes a case and a plurality of battery cells housed in a stacked state within the case. [Background technology]

[0002] Conventionally, a battery pack (power supply device) including a cover case with one end open, a plurality of battery cells each having a terminal arranged on one surface and housed in the cover case in a stacked state with the one surface facing the same direction, and a plurality of bus bars for connecting the plurality of battery cells in series is known (see, for example, Patent Document 1). When manufacturing this battery pack, first, the plurality of battery cells are stacked, and the stack of battery cells is sandwiched from both sides by a plurality of binding jigs arranged in order from the bottom in the height direction. Next, while moving the plurality of binding jigs away from the stack in order from the bottom, the stack is inserted into the cover case so that the electrode terminals of each battery cell are located on the upper side (open end side). Then, the stack of battery cells is pressed from above by a pressing jig to press the stack into the cover case. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 133711 Summary of the Invention [Problem to be solved by the invention]

[0004] The battery pack manufactured as described above does not require fasteners such as bind bars, and therefore the entire device can be made smaller and lighter. However, in the manufacture of the conventional battery pack described above, the load applied to the stack of battery cells from the pressing jig needs to be limited from the viewpoint of protecting the components. Therefore, even if the stack is pressed from above by the pressing jig and inserted into the cover case, the height positions of the electrode terminals (height from the bottom surface of the case) of the multiple battery cells vary. For this reason, when the busbar is arranged on the stack so as to overlap with the corresponding electrode terminal, the gap between some of the electrode terminals and the busbar becomes large, and there is a risk of poor joining even if some of the electrode terminals are joined to the busbar by welding or the like.

[0005] Therefore, a primary objective of the present disclosure is to provide a manufacturing method for a battery pack that can effectively suppress poor connections between the terminals of multiple battery cells inserted in a stacked state into a case and the bus bars, thereby improving the production efficiency of the battery pack. [Means for solving the problem]

[0006] The manufacturing method for a battery pack disclosed herein includes a case having an open end, a plurality of battery cells each having a terminal arranged on one side and stacked within the case with the one side facing in the same direction, and a plurality of bus bars joined to the corresponding terminals, the method including stacking the plurality of battery cells with the one side facing in the same direction and compressing them from both sides, inserting the compressed plurality of battery cells into the case with the one side positioned on the open end side of the case, arranging the plurality of bus bars on the one sides of the plurality of battery cells so as to overlap the corresponding terminals, moving the pressing jig so as to press the plurality of bus bars toward the bottom surface from a pressing start position that corresponds to the height position of the terminal of the battery cell that is furthest from the bottom surface of the case, and joining each of the plurality of bus bars to the corresponding terminal.

[0007] In the manufacturing method of the battery pack of the present disclosure, the stacked and compressed battery cells are inserted into the case so that one surface of each battery cell is located at the open end side of the case. Furthermore, a plurality of bus bars are arranged on one surface of the battery cells so as to overlap the corresponding terminals. Furthermore, the pressing tool is moved so as to press the plurality of bus bars toward the bottom surface side of the case. At this time, the pressing tool starts moving from a pressing start position according to the height position of the terminal of the battery cell that is farthest from the bottom surface of the case. As a result, even if there is a variation in the height position of the terminals among the plurality of battery cells, it is possible to sufficiently press the bus bar that overlaps the terminal of the battery cell located on the bottom surface side in the case by the pressing tool. Therefore, according to the method of the present disclosure, the bus bar and the terminal can be joined with the gap between each terminal and the bus bar being sufficiently small. As a result, it is possible to effectively suppress poor joining between the terminals of the plurality of battery cells that are inserted in a stacked state into the case and the bus bar, thereby improving the production efficiency of the battery pack.

[0008] The method may further include moving the pressing jig from the pressing start position by at least the difference in height between the terminal of the battery cell that is farthest from the bottom surface of the case and the terminal of the battery cell that is closest to the bottom surface of the case, thereby making it possible to sufficiently press the bus bar that overlaps the terminal of the battery cell that is closest to the bottom surface of the case with the pressing jig, while preventing the bus bar from being excessively pressed against the terminal of the battery cell that is far from the bottom surface of the case.

[0009] Furthermore, the method may include, after inserting the battery cells into the case and before arranging the bus bars on the one surface of the battery cells, acquiring a distance from the terminal of the battery cell that is farthest from the bottom surface of the case to a predetermined reference surface and a distance from the terminal of the battery cell that is closest to the bottom surface of the case to the reference surface, thereby making it possible to appropriately determine, from the acquired distances, a movement amount of a pressure tool that corresponds to an insertion state of the battery cells into the case.

[0010] The pressing tool may include a plurality of pressing parts each pressing the corresponding busbar, and each of the pressing parts may include a pressing member capable of coming into contact with the busbar, a support member supporting the pressing member so as to be movable in the moving direction of the pressing tool, and a pressing mechanism disposed between the pressing member and the support member and generating a load according to the amount of movement of the pressing member. This makes it possible to appropriately pressurize each of the plurality of busbars in accordance with the gap between the corresponding terminal and the busbar, thereby making the gap smaller, while avoiding application of an excessive load to the busbar.

[0011] Furthermore, the pressure application start position may be a position where at least one of the pressing members of the plurality of pressing portions abuts against the corresponding bus bar.

[0012] In addition, the method may include welding each of the bus bars to the corresponding terminal while pressing the bus bars with the pressing jig, thereby making it possible to effectively prevent poor bonding between the terminal of each battery cell and the bus bar. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a battery pack manufactured by the manufacturing method of the present disclosure. [Diagram 2] 4 is a flowchart for explaining a manufacturing method of a battery pack according to the present disclosure. [Diagram 3] 1A to 1C are explanatory diagrams for explaining a manufacturing method of a battery pack according to the present disclosure. [Figure 4] 1A to 1C are explanatory diagrams for explaining a manufacturing method of a battery pack according to the present disclosure. [Diagram 5] 1A to 1C are explanatory diagrams for explaining a manufacturing method of a battery pack according to the present disclosure. [Figure 6] 1A to 1C are explanatory diagrams for explaining a manufacturing method of a battery pack according to the present disclosure. [Figure 7] 1A to 1C are explanatory diagrams for explaining a manufacturing method of a battery pack according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Next, an embodiment of the present disclosure will be described with reference to the drawings.

[0015] FIG. 1 is a schematic diagram showing a battery pack 1 manufactured by the manufacturing method of the present disclosure. The battery pack 1 shown in the figure is mounted on a vehicle such as an electric vehicle or a hybrid vehicle to exchange power with an electric motor of the vehicle. As shown in the figure, the battery pack 1 includes a case 2 and a battery stack 3 housed in the case 2. The case 2 is a casting made of a metal such as an aluminum alloy, and one end of the case 2, i.e., the end opposite to a bottom surface 2b of the case 2 (the upper end in FIG. 1), is open. In this embodiment, the case 2 is formed to house a single battery stack 3, but may be formed to house a plurality of battery stacks 3, for example, in parallel.

[0016] As shown in Fig. 1, the battery stack 3 includes a plurality of battery cells 4, a number (plurality) of spacers (resin frames) 5 (one less than the number of battery cells 4), a plurality (two) of end plates 6, and a plurality of bus bars 7. The battery stack 3 is formed by stacking a plurality of battery cells 4, spacers 5, and end plates 6 in one direction. More specifically, the battery cells 4 and spacers 5 are alternately arranged between the two end plates 6, and one spacer 5 is disposed between two battery cells 4. The plurality of battery cells 4 are also connected in series by the plurality of bus bars 7.

[0017] The battery cells 4 of the battery stack 3 are, for example, sealed lithium ion secondary batteries or nickel hydrogen secondary batteries, and include a metal housing 4c formed in a substantially rectangular parallelepiped shape, and electrodes and a nonaqueous electrolyte (not shown) housed inside the housing. Two terminals 4t (only one terminal 4t is shown for each battery cell 4 in FIG. 1) are arranged on the upper surface (one surface) 4u of each housing 4c, and are connected to the positive electrode plate or the negative electrode plate forming the electrodes. The terminal 4t of each battery cell 4 is electrically connected to the terminal 4t of the corresponding battery cell 4 via one of the bus bars 7.

[0018] The spacer 5 is made of an insulating material such as resin, and holds two adjacent battery cells 4 while insulating them from each other. Furthermore, the spacer 5 also functions as a heat dissipation member that dissipates heat from the two battery cells 4. The end plate 6 is made of an insulating metal such as an aluminum alloy or resin. The bus bars 7 are integrally supported by a module body (not shown) made of an insulating material such as resin so that the front and back surfaces of the module body are exposed to the outside. That is, in this embodiment, the battery cells 4 are electrically connected by a bus bar module including the bus bars 7 and the module body. However, the bus bars 7 may be installed individually for the battery cells 4.

[0019] Next, a manufacturing method of the present disclosure for manufacturing the battery pack 1 will be described with reference to FIGS.

[0020] 2 is a flowchart for explaining a manufacturing method of the battery pack 1. When manufacturing the battery pack 1, first, the battery cells 4 are assembled to each spacer 5, and the battery cells 4 and spacers 5 are stacked so that the upper surfaces 4u, i.e., the terminals 4t, of the battery cells 4 face the same direction (upward) (step S100). Also, in step S100, the battery cells 4 and spacers 5 are stacked so that one spacer 5 is located between two adjacent battery cells 4, and end plates 6 are placed on both sides of the stack of battery cells 4 and spacers 5.

[0021] The stack of battery cells 4, spacers 5, and end plates 6 is compressed from both sides in the stacking direction by a pair of restraining tools 10 provided on a stack insertion device (not shown) (step S110), as shown in Fig. 3. Furthermore, the stack compressed and held by the restraining tools 10 is inserted (press-fit) into the open end of the case 2 by the stack insertion device, as shown in Fig. 4 (step S120). As a result, the stack of battery cells 4, spacers 5, and end plates 6 is held in a compressed state by the case 2, and the battery stack 3 is formed.

[0022] Here, the housing 4c of the battery cell 4, the spacer 5, and the end plate 6 are all elastic, and there is some variation in the dimensions of each. For this reason, even if the stack of the battery cells 4, the spacer 5, and the end plate 6 is compressed by the restraining jig 10 and inserted into the case 2, there will be variation in the height position of the terminal 4t on the top surface 4u, i.e., the height (the distance in the depth direction (up and down direction) of the case 2) from the bottom surface 2b of the case 2) between the multiple battery cells 4, as shown in Figures 5 and 6. In light of this, in this embodiment, after the insertion (assembly) of the battery stack 3 into the case 2 is completed, a shape inspection of the battery stack 3 is performed in order to grasp the variation in the height position of the terminal 4t between the multiple battery cells 4 (step S130).

[0023] In step S130, as shown in FIG. 5, a distance from a predetermined arbitrary reference plane Pref to the top of the terminal 4t is measured for each of the plurality of battery cells 4 using a distance measuring device 20 such as a laser distance meter. In this embodiment, the reference plane Pref is a plane that includes the starting point of the distance measuring device 20 and is perpendicular to the depth direction of the case 2. Furthermore, in step S130, a distance Zh from the terminal 4t of the battery cell 4 farthest from the bottom surface 2b of the case 2 (the battery cell 4 located at the top in FIG. 5) to the reference plane Pref and a distance Zl from the terminal 4t of the battery cell 4 closest to the bottom surface 2b of the case 2 (the battery cell 4 located at the bottom in FIG. 5) to the reference plane Pref are acquired. The distance Zh is the minimum value of the distance from the reference plane Pref to the top of the terminal 4t measured for the plurality of battery cells 4, and the distance Zl is the maximum value of the distance from the reference plane Pref to the top of the terminal 4t measured for the plurality of battery cells 4. Moreover, in step S130, the difference ΔZ (=Zl−Zh) between the distance Zh and the distance Zl is calculated.

[0024] 6, the busbar module is placed on the upper surfaces 4u of the battery cells 4 such that each of the busbars 7 overlaps with its corresponding terminal 4t in the depth direction (vertical direction) of the case 2 (step S140). At this time, since there is variation in the height position of each battery cell 4 (terminal 4t) due to the assembly of the battery stack 3 into the case 2, there is also variation in the gap between each terminal 4t and the corresponding busbar 7, as shown in the figure.

[0025] After the assembly of the multiple busbars 7 (busbar modules) is completed, the case 2 housing the battery stack 3 is set (positioned) below a pressure jig 30 of pressure welding equipment, as shown in Fig. 7. The pressure jig 30 includes a moving member 31 that can be raised and lowered in the up-down direction (vertical direction) in the figure, i.e., in the depth direction of the case 2, and multiple pressing parts 35 supported by the moving member 31. In this embodiment, the moving member 31 supports the same number of pressing parts 35 as the number of battery cells 4 of one battery stack 3, corresponding to one battery stack 3, and is raised and lowered in the depth direction of the case 2 by a moving mechanism (not shown) that includes, for example, an electric motor or the like.

[0026] 7, each pressing section 35 of the pressing jig 30 includes two pressing members 36, two support members 37, and two pressing mechanisms 38. Each pressing section 35 is supported by the moving member 31 such that the two pressing members 36 face the two terminals 4t of the corresponding battery cell 4 in the battery stack 3. In addition, each support member 37 supports the corresponding pressing member 36 via a linear guide or the like so that it can slide (move) in the moving direction of the pressing jig 30, i.e., the moving member 31 (up and down direction, i.e., the depth direction of the case 2).

[0027] Each pressure mechanism 38 is a spring mechanism including an elastic body such as a coil spring, a disc spring, or rubber, or a servo mechanism, and is disposed between the corresponding pressing member 36 and the support member 37. Each pressure mechanism 38 generates a load according to the amount of movement (amount of pressing) of the pressing member 36 as the corresponding pressing member 36 moves toward the moving member 31. Furthermore, when the pressure mechanisms 38 of all the pressing units 35 are not generating a load, the contact surfaces (lower end surfaces) of all the pressing members 36 are included in approximately the same plane.

[0028] When the case 2 containing multiple battery cells 4 etc. is set below the pressing jig 30, the moving member 31 of the pressing jig 30 is moved by a moving mechanism (not shown) so as to press the multiple bus bars 7 against the bottom surface 2b of the case 2, as shown in Fig. 7 (step S150). In step S150, as the moving member 31 moves relative to the case 2, at least one pressing member 36 (its contact surface) comes into contact with the corresponding bus bar 7. As a result, each pressing member 36 is positioned at a position where the contact surface (lower surface) is separated from the reference plane Pref by a value close to the distance Zh, that is, at a pressing start position according to the height position of the terminal 4t of the battery cell 4 that is farthest from the bottom surface 2b of the case 2.

[0029] Then, in step S150, the moving member 31 is moved (lowered) by the moving mechanism from a pressure application start position where at least one pressing member 36 (the contact surface of the pressing member 36) is in contact with the corresponding bus bar 7, so that each pressing member 36 moves (lowers) by a target movement amount toward the bottom surface 2b of the case 2. In this embodiment, the target movement amount of each pressing member 36 is set to the sum of the difference ΔZ calculated in step S130 and a predetermined margin (for example, several millimeters). As a result, even if some pressing members 36 are not in contact with the corresponding bus bar 7 at the pressure application start position, the pressing members 36 will come into contact with the corresponding bus bar 7 and press the bus bar 7 against the bottom surface 2b of the case 2 as the moving member 31 moves (lowers).

[0030] While the moving member 31 moves toward the bottom surface 2b of the case 2, each pressure mechanism 38 of the pressure jig 30 generates a load according to the amount of movement (push) of the pressing member 36 relative to the support member 37 after it comes into contact with the busbar 7, and this load is applied from each pressing member 36 to the corresponding busbar 7. As a result, pressure is applied by each pressing member 36, causing each busbar 7 to elastically deform and causing some of the battery cells 4 to be pressed toward the bottom surface 2b of the case 2, and the gap between each terminal 4t and the busbar 7 becomes sufficiently small.

[0031] When each pressing member 36 moves by the target movement amount (ΔZ+margin), the moving member 31 is stopped. After that, a welding machine (e.g., a laser welding machine) (not shown) is inserted into an opening formed in the moving member 31, etc., and each bus bar 7 is welded to the corresponding terminal 4t by the welding machine (step S160). That is, each bus bar 7 is welded to the terminal 4t while being pressed against the terminal 4t by the corresponding pressing member 36 (pressure jig 30). This makes it possible to join the bus bar 7 and the terminal 4t with the gap between each terminal 4t and the bus bar 7 being sufficiently small. When the welding process in step S170 is completed, the manufacture of one battery pack 1 is completed.

[0032] As described above, when manufacturing the battery pack 1, a stack of multiple battery cells 4 etc. compressed by a pair of restraining jigs 10 is inserted into the case 2 so that the top surface (one surface) 4u of each battery cell 4 is located at the open end side of the case 2 (step S120). In addition, multiple bus bars 7 are arranged on the top surfaces 4u of the multiple battery cells 4 so as to overlap the corresponding terminals 4t (step S140). Furthermore, the moving member 31 and multiple pressing parts 35 of the pressing jig 30 are moved so as to press the multiple bus bars 7 toward the bottom surface 2b of the case 2 (step S150). At this time, each pressing member 36 of the pressing jig 30 starts moving from a pressing start position corresponding to the height position of the terminal 4t of the battery cell 4 that is furthest from the bottom surface 2b of the case 2 (height from the bottom surface 2b of the case 2). As a result, even if there is variation in the height position of the terminals 4t among multiple battery cells 4, the busbar 7 overlapping the terminal 4t of the battery cell 4 located on the bottom surface 2b side inside the case 2 can be sufficiently pressed by the corresponding pressing member 36 of the pressing jig 30.

[0033] That is, according to the process of step S150, it is possible to effectively prevent the busbar 7 overlapping the terminal 4t of the battery cell 4 located on the bottom surface 2b side in the case 2 from being insufficiently pressed in by the pressing jig 30, compared to, for example, a case in which the pressing start position of each pressing member 36 (pressing jig 30) is fixed at a position relatively far from the bottom surface 2b and the target movement amount of the moving member 31 is set to the sum of various design tolerances such as the tolerances of the battery cells 4 and the spacers 5. Therefore, in the above embodiment, it is possible to weld (join) the busbar 7 and the terminal 4t with the gap between each terminal 4t and the busbar 7 being sufficiently small (step S160), and the time required for manufacturing the battery pack 1 can be shortened. As a result, it is possible to effectively prevent poor joining between the terminals 4t of the multiple battery cells 4 inserted in a stacked state in the case 2 and the busbar 7, and improve the production efficiency of the battery pack 1.

[0034] Furthermore, in step S150, each pressing member 36 of the pressing tool 30 is moved from the pressing start position by at least the difference ΔZ between the distance Zh indicating the height position of the terminal 4t of the battery cell 4 that is farthest from the bottom surface 2b of the case 2, and the distance Zl indicating the height position of the terminal 4t of the battery cell 4 that is closest to the bottom surface 2b of the case 2. This makes it possible for the pressing tool 30 to sufficiently press the busbar 7 that overlaps the terminal 4t of the battery cell 4 that is closest to the bottom surface 2b of the case 2, while preventing the busbar 7 from being pressed excessively against the terminal 4t of the battery cell 4 that is away from the bottom surface 2b of the case 2.

[0035] Furthermore, the distances Zh, Zl, and difference ΔZ are acquired after a stack including the plurality of battery cells 4 and the like is inserted into the case 2 and before the plurality of bus bars 7 are arranged on one surface of the plurality of battery cells 4 (step S130). This makes it possible to properly determine the target movement amount of each pressing member 36 (moving member 31) according to the insertion state of the plurality of battery cells 4 into the case 2 from the distances Zh and Zl acquired in step S130. Note that the reference plane Pref for acquiring the distances Zh and Zl is not limited to a plane including the starting point of the distance measuring device 20 as described above, and for example, the bottom surface 2b or the inner bottom surface of the case 2 may be the reference plane Pref.

[0036] In the above embodiment, the pressing jig 30 includes a plurality of pressing portions 35 that press the corresponding bus bars 7. Each pressing portion 35 further includes a pressing member 36 that can come into contact with the bus bar 7, a support member 37 that supports the pressing member 36 so as to be movable in the moving direction of the pressing jig 30 (moving member 31), and a pressing mechanism 38 that is disposed between the pressing member 36 and the support member 37 and generates a load according to the amount of movement of the pressing member 36. This makes it possible to appropriately pressurize each of the plurality of bus bars 7 in accordance with the gap between the corresponding terminal 4t and the bus bar 7, thereby making the gap smaller, while preventing an excessive load from being applied to the bus bar 7.

[0037] In the above embodiment, each of the bus bars 7 is welded to the corresponding terminal 4t while being pressed by the pressing jig 30 (step S160). This makes it possible to effectively prevent poor bonding between the terminal 4t of each battery cell 4 and the bus bar 7.

[0038] In addition, the invention of the present disclosure is not limited to the above embodiment, and various modifications can be made within the scope of the present disclosure. Furthermore, the above embodiment is merely a specific form of the invention described in the Summary of the Invention, and does not limit the elements of the invention described in the Summary of the Invention. [Industrial Applicability]

[0039] The invention of the present disclosure can be used in fields such as battery pack manufacturing. [Explanation of symbols]

[0040] 1 battery pack, 2 case, 2b bottom surface, 3 battery stack, 4 battery cell, 4c housing, 4t terminal, 4u top surface, 5 spacer, 6 end plate, 7 bus bar, 10 restraint jig, 20 distance measuring device, 30 pressure jig, 31 moving member, 35 pressing portion, 36 pressing member, 37 support member, 38 pressure mechanism, Pref reference surface.

Claims

1. A method for manufacturing a battery pack including a case having an open end, a plurality of battery cells each having a terminal arranged on one side thereof and stacked and housed within the case with the one side thereof facing in the same direction, and a plurality of bus bars each joined to a corresponding one of the terminals, comprising: The plurality of battery cells are stacked so that the one surface faces the same direction and compressed from both sides; inserting the compressed battery cells into the case such that the one surface is positioned on the open end side of the case; The bus bars are arranged on the one surface of the battery cells so as to overlap the corresponding terminals; a pressing jig is moved so as to press the bus bars toward the bottom surface from a pressing start position that corresponds to a height position of the terminal of the battery cell that is furthest from the bottom surface of the case; Joining each of the plurality of bus bars to a corresponding one of the terminals; A method for manufacturing a battery pack.

2. 2. The method for manufacturing a battery pack according to claim 1, the pressing tool is moved from the pressing start position by at least a difference in height between a terminal of the battery cell that is farthest from the bottom surface of the case and a terminal of the battery cell that is closest to the bottom surface of the case; A method for manufacturing a battery pack.

3. 3. The method for producing a battery pack according to claim 1, further comprising the steps of: after inserting the plurality of battery cells into the case and before arranging the plurality of bus bars on the one surface of the plurality of battery cells, a distance from the terminal of the battery cell that is farthest from the bottom surface of the case to a predetermined reference surface and a distance from the terminal of the battery cell that is closest to the bottom surface of the case to the reference surface are obtained. A method for manufacturing a battery pack.

4. The method for manufacturing a battery pack according to any one of claims 1 to 3, the pressing jig includes a plurality of pressing portions each configured to press a corresponding one of the bus bars, each of the pressing units includes a pressing member capable of contacting the bus bar, a support member that supports the pressing member so as to be movable in a moving direction of the pressing jig, and a pressing mechanism that is disposed between the pressing member and the support member and generates a load corresponding to an amount of movement of the pressing member; A method for manufacturing a battery pack.

5. The method for producing a battery pack according to claim 4, the pressurization start position is a position where at least one of the pressing members of the plurality of pressing portions abuts against the corresponding bus bar, A method for manufacturing a battery pack.

6. The method for manufacturing a battery pack according to any one of claims 1 to 5, while pressing the bus bars with the pressing jig, welding each of the bus bars to the corresponding terminal. A method for manufacturing a battery pack.

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