JP6279948B2 - Battery system manufacturing method and battery system manufactured by this method - Google Patents

Description

  In the present invention, a plurality of battery cells are stacked, and adjacent battery cells are electrically connected by a bus bar to form a battery stack block, and a binding tool is connected to end plates disposed at both ends of the battery stack block to The present invention relates to a method for manufacturing a battery system that is fixed in a state of being pressurized in a stacking direction, and a battery system manufactured by this method.

  A large number of battery cells are stacked to form a battery stack block, a pair of end plates are arranged on both end faces of the battery stack block, both end plates are connected by a binding tool, and the stacked battery cells are pressed. A battery system to be fixed to the battery has been developed. (See Patent Document 1)

  This battery system fixes a battery cell in a pressed state with a pair of end plates. The end plates are arranged on both end faces of the battery stack block in which a plurality of battery cells are stacked, and are connected to a binding tool in a state in which the battery stack block is pressed to fix the battery stack block in a pressurized state. Further, adjacent battery cells are connected in series or in parallel with a metal plate bus bar fixed to the positive and negative electrode terminals.

JP 2011-60623 A

  By the way, in the battery system, due to the dimensional error of the battery cells generated in the manufacturing process, the relative positions of the electrode terminals of the adjacent battery cells are shifted in a state where they are stacked. Adjacent battery cells are fixed by welding or screwing a metal plate bus bar to the positive and negative electrode terminals, so that it is difficult to reliably and securely fix the bus bar when the relative position is shifted. For example, when battery cells with dimensional errors in the height between the terminal surface on which the electrode terminal is provided and the bottom surface on the opposite side are stacked on the same plane, the terminal surfaces of adjacent battery cells are the same It is not placed on a plane. In battery stack blocks in which the terminal surfaces of adjacent battery cells cannot be arranged on the same plane, the electrode terminals of adjacent battery cells are relatively displaced up and down. If a bus bar made of a thick metal plate that is not elastically deformed is fixed to the electrode terminal on the terminal surface that is displaced up and down, excessive stress acts on the electrode terminal, causing damage to the battery cell.

  The above adverse effects can be solved by, for example, a structure in which the terminal surfaces of the respective battery cells are arranged on the same plane. In the battery system in which the terminal surfaces are arranged on the same plane, an elastic body is arranged on the bottom surface of each battery cell, and the battery cell is elastically pressed by the elastic body, and each battery cell pressed by the elastic body This can be realized by pressing the terminal face of the jig against the jig placed horizontally. This battery system needs to be assembled by placing a jig so as to face the terminal surface of the battery cell. However, the terminal surface of the battery cell has positive and negative electrode terminals and a pressure valve that opens when the internal pressure becomes abnormally high, which makes it difficult to stably press the jig over a wide area. . In addition, battery cells having an outer case made of metal such as aluminum are connected in series with each other and have a potential difference between adjacent battery cells. There is an adverse effect of short current flow.

  The present invention was developed for the purpose of eliminating the above drawbacks, and an important object of the present invention is a method for manufacturing a battery system that can be easily and efficiently assembled while arranging terminal surfaces of battery cells on the same plane. And providing a battery system manufactured by this method.

Means for Solving the Problems and Effects of the Invention

  In the battery system manufacturing method of the present invention, a plurality of battery cells 1 in which terminal surfaces 1A provided with positive and negative electrode terminals 13 are arranged on the same plane are stacked with insulating spacers 5 interposed therebetween, and The battery cell 2 is arranged on the bottom surface of the battery stack block 2 formed by electrically connecting the adjacent battery cells 1 with the bus bar 14 fixed to the electrode terminal 13 and the battery stack block 2 located on the opposite side of the terminal surface 1A. 1 is elastically pressed to the terminal surface 1A toward the terminal surface 1A. The elastic plate 9 is provided at both ends of the battery stack 2 and the battery cell 1 is pressed and fixed in the stacking direction. A battery system including a pair of end plates 3 and a binding device 4 connected to the pair of end plates 3 and fixing the plurality of battery cells 1 in a pressurized state with the end plates 3 is manufactured. In the manufacturing process of the insulating spacer 5, the outer peripheral cover portion 21 in which the battery cell 1 is fitted and disposed in a fixed position and the insulating spacer 5 is disposed in a fixed position in the insulating spacer 5. 5 is provided on both side surfaces of the battery stack block 2 so that the terminal surfaces 1A of the battery cells 1 are arranged on the same plane through the battery 5, and the insulating spacers 5 and the battery cells 1 are stacked. In the step of arranging the terminal surface 1A of the cell 1 on the same plane, the jig 50 is disposed on the positioning locking portion 27, and the elastic spacer 19 or the insulating spacer 5 or the battery cell 1 is pressed in the direction of the terminal surface 1A. The terminal surface 1A of the battery cell 1 is arranged on the same plane via the insulating spacer 5 arranged at a fixed position by engaging the positioning locking portion 27 with the jig 50, and the terminal surface 1A of the battery cell 1 is set on the same plane. With the battery stack Connecting the closure 4 to the end plate 3 disposed at both ends of the click 2.

  The battery system manufacturing method described above is characterized in that it can be easily and efficiently assembled while arranging the terminal surfaces of the battery cells on the same plane. This is because the above manufacturing method presses the battery cell toward the opposite surface with the elastic pressing portion of the elastic plate, and provides the positioning locking portion on the insulating spacer that connects the battery cell to the fixed position. It is because the opposing surface of a battery cell is arrange | positioned on the same plane through an insulating spacer by pressing a latching | locking part to a jig. In the above battery system manufacturing method, the battery cells are not directly pressed on the jig and the opposing surfaces are not arranged on the same plane. A battery cell arrange | positions an opposing surface on the same plane through the insulating spacer formed by connecting this to a fixed position. In order to realize this, the insulating spacer is provided with a positioning locking portion on the side cover portion of the outer peripheral cover portion that covers both side surfaces of the battery stack. In this structure, since the positioning latching portions are arranged on both side surfaces of the battery stacking block, jigs are arranged on both sides of the battery stacking block, and the positioning latching portions are pressed against the jigs by the elastic pressing portions, so that the battery cell Terminal surfaces can be arranged on the same plane. Furthermore, since this method arrange | positions the terminal surface of a battery cell on the same plane via an insulating spacer, a metal bar can be used for a jig. This is because the jig does not contact the battery cell and short-circuit the battery cell. For this reason, the terminal surface of a battery cell can be arrange | positioned on the same plane with the metal jig | tool which is firm and does not deform | transform.

  In the battery system manufacturing method of the present invention, the outer peripheral cover portion 21 of the insulating spacer 5 is provided with a side cover portion 23 disposed on both sides of the battery cell 1 and an end surface cover portion 22 that covers the terminal surface 1A of the battery cell 1. By providing the inner surface of the end surface cover portion 22 as a surface facing the terminal surface 1A, the outer surface of the end surface cover portion 22 can be used as the positioning locking portion 27.

  In the above manufacturing method, the end surface cover portion of the outer peripheral cover portion is disposed on the terminal surface of the battery cell, and the outer side of the end surface cover portion is used as the positioning locking portion, so that the jig is connected to the battery cell via the end surface cover portion. The terminal surfaces of are the same plane. That is, the end surface cover portion of the insulating spacer is disposed between the terminal surface and the jig, and the terminal surface is disposed on the same plane, so that the end surface cover portion is pressed through the battery cell by the pressing force of the elastic pressing portion. However, this is not deformed, and the terminal surface of the battery cell can be stably and reliably arranged on the same plane with the positioning locking portion. Further, the terminal surface of the battery cell can be arranged on the same plane with the thin end surface cover portion without being deformed even if the end surface cover portion is thinned.

  In the battery system manufacturing method of the present invention, a binding tool 4 is connected to a pair of end plates 3, and the battery stack block 2 is fixed with the binding tool 4 in the stacking direction of the battery cells 1 in a pressurized state. The bus bar 14 can be fixed to the electrode terminal 13 of the cell 1.

  In the battery system manufacturing method described above, the terminal surfaces of the battery cells are arranged on the same plane and the bus bar is fixed to the electrode terminal, so that an excessive force does not act on the electrode terminal and the bus bar. This is because the electrode terminal for fixing the bus bar is arranged at a fixed position, the bus bar is fixed, and the relative position of the electrode terminal fixing the bus bar is fixed in a state where the bus bar is fixed.

  The battery system manufacturing method of the present invention is provided with a cover wall 28 extending away from the positioning locking portion 27 and extending in parallel therewith, and a locking groove 29 is formed between the positioning locking portion 27 and the cover wall 28. The jig 50 can be disposed in the locking groove 29, and the positioning locking portion 27 can be disposed on the same plane by the jig 50.

  In the battery system manufacturing method described above, the locking groove is provided in the insulating spacer, and the inner surface on one side of the locking groove is used as the positioning locking portion. The terminal surface of the battery cell can be arranged on the same plane by preventing the positional shift in the stop groove width direction. That is, it is possible to hold the insulating spacers in a state where they are not displaced and temporarily fix them, efficiently stack the battery cells, and assemble the terminal surfaces on the same plane.

  In the battery system manufacturing method of the present invention, the binding device 4 is provided with a fitting portion 4A guided by the locking groove 29, and the fitting portion 4A is inserted into the locking groove 29 so that the binding device 4 is attached to the end plate. 3 can be connected. In this manufacturing method, since the fitting portion of the binding tool is guided and fixed to the end plate in the locking groove having one surface as the positioning locking portion, the terminal surface of the battery cell is flush with the fitting portion of the binding tool. Can be retained. For this reason, it is possible to prevent the relative displacement of the terminal surfaces of the battery cells in a state where the binding tool is fixed to the end plate and the battery cells and the insulating spacers are fixed in the stacked state by the end plate. Therefore, it is possible to reliably prevent the battery cells having the same terminal surface from being displaced due to vibration or the like in the use state and applying an excessive force to the bus bar and the electrode terminal.

  In the battery system manufacturing method of the present invention, the elastic pressing portion 19 presses the outer peripheral cover portion 21 and the positioning locking portion 27 can be arranged on the same plane by the jig 50. In this manufacturing method, the elastic pressing portion presses the outer peripheral cover portion, and the positioning locking portion is arranged on the same plane with a jig. Therefore, even if the elastic plate provided with the elastic pressing portion is an elastic metal plate, it is adjacent. The battery cell is not short-circuited. Therefore, the elastic pressing part can be used as the elastic arm of the metal plate, and the elastic plate can be mass-produced at low cost, and further, the characteristic that the elastic force of the elastic arm can be prevented from decreasing with time can be realized.

  In the battery system of the present invention, a plurality of battery cells 1 having positive and negative electrode terminals 13 provided on the terminal surface 1A are stacked with an insulating spacer 5 therebetween, and are fixed to the electrode terminals 13 of each battery cell 1. The battery stack block 2 is formed by electrically connecting the battery cells 1 via the bus bar 14 and the battery stack block 2 is disposed on the bottom surface of the battery stack block 2 so that the battery cell 1 is elastic from the bottom surface 1B toward the terminal surface 1A. An elastic plate 9 having an elastic pressing portion 19 that is pressed against each other, and a pair of end plates 3 that are both ends of the battery stacking block 2 in the stacking direction and are pressed and fixed in the stacking direction. And a binding tool 4 connected to the pair of end plates 3 and fixing the plurality of battery cells 1 in a pressurized state. Further, the insulating spacer 5 is fitted in the battery stack block 2 and arranged at a fixed position, and the outer peripheral cover portion 21 that covers both side surfaces of the battery stack block 2 and the insulating spacer 5 are arranged at a fixed position. Positioning locking portions 27 for arranging the terminal surfaces 1A of the battery cells 1 on the same plane via the insulating spacers 5 are provided on both side surfaces of the battery stack block 2.

  The battery system described above has a feature that it can be easily and efficiently assembled while arranging the terminal surfaces of the battery cells on the same plane. This is because the battery system described above is fixed by fitting the battery stack block to the insulating spacer that connects the battery cells in place while pressing the battery cells toward the opposite surface with the elastic pressing portion of the elastic plate. An outer peripheral cover portion that covers the both side surfaces of the battery block, and a positioning locking portion that places the insulating spacer at a fixed position and places the terminal surface of the battery cell in the same plane via the insulating spacer. This is because it is provided on both sides of the battery block. In particular, in this battery system, an insulating spacer that connects battery cells in a fixed position is arranged at a fixed position by positioning locking portions provided on both side surfaces of the battery stack, and the battery is interposed through the insulating spacer. Since the opposing surfaces of the cells are arranged on the same plane, the battery cell terminal surfaces can be arranged on the same plane without short-circuiting the battery cells even if a metal bar is brought into contact with the positioning locking portion.

  In the battery system of the present invention, an end surface cover portion 22 that covers the terminal surface 1A of the battery cell 1 is provided on the outer peripheral cover portion 21 of the insulating spacer 5, and the inner surface of the end surface cover portion 22 faces the terminal surface 1A. As described above, the outer surface can be used as the positioning locking portion 27.

  In the battery system described above, the end cover portion is provided on the outer peripheral cover portion disposed on the terminal surface of the battery cell, and the outer surface of the end cover portion is used as the positioning lock portion. In this state, it is possible to prevent the end surface cover portion from being deformed, that is, the positioning locking portion from being displaced. This is because the end surface cover portion is sandwiched between the jig and the terminal surface and the terminal surfaces of the battery cells are arranged on the same plane.

In the battery system of the present invention, the insulating spacer 5 is provided with a cover wall 28 that is separated from the positioning locking portion 27 and extends in parallel therewith, and a locking groove 29 is provided between the positioning locking portion 27 and the cover wall 28. To do. In this battery system, a locking groove is provided in the insulating spacer, and the inner surface on one side of the locking groove is used as a positioning locking portion. Therefore, the jig is guided to the locking groove and the insulating spacer is arranged in the width direction of the locking groove. Can be prevented from being displaced. For this reason, the terminal surface of a battery cell can be arrange | positioned on the same plane, hold | maintaining in the state which does not shift | displace an insulation spacer. That is, it can be assembled by temporarily fixing the insulating spacers while preventing the displacement of the insulating spacers, efficiently stacking the battery cells, and arranging the terminal surfaces on the same plane.

  In the battery system of the present invention, the binding tool 4 is provided with a fitting portion 4A guided by the locking groove 29, and the fitting portion 4A is inserted into the locking groove 29 to connect the binding tool 4 to the end plate 3. can do. In this battery system, the fitting portion of the binding tool is inserted into the locking groove of the insulating spacer to connect the binding tool to the end plate. In this battery system, since the fitting part of the binding tool is guided and fixed to the end plate in the locking groove having one surface as the positioning locking part, the terminal surface of the battery cell is flush with the fitting part of the binding tool. The battery cell can be fixed in a stacked state. For this reason, in the state which fixes a binding tool to an end plate, a battery cell and an insulating spacer can be fixed to a lamination | stacking state with an end plate, and the relative position shift of the terminal surface of a battery cell can be prevented. Therefore, the battery cells stacked so that the terminal surfaces are coplanar are not displaced due to vibration or the like in use, and it is ensured that an excessive force acts on the bus bar and the electrode terminal for a long period of time. I can stop.

  In the battery system according to the present invention, the outer peripheral cover portion 21 provided on the insulating spacer 5 is pressed by the elastic pressing portion 19, and the terminal surface 1A is arranged on the same plane. In this battery system, since the elastic pressing part presses the outer peripheral cover part of the insulating spacer and the terminal surfaces of the battery cells are arranged on the same plane, even if the elastic plate provided with the elastic pressing part is an elastic metal plate, There is no short circuit between adjacent battery cells. Therefore, the elastic pressing part can be used as the elastic arm of the metal plate, and the elastic plate can be mass-produced at low cost, and further, the characteristic that the elastic force of the elastic arm can be prevented from decreasing with time can be realized.

It is a perspective view of the battery system concerning one embodiment of the present invention. It is a disassembled perspective view of the battery system shown in FIG. FIG. 2 is a vertical cross-sectional view of the battery system shown in FIG. 1. FIG. 4 is an enlarged cross-sectional view of a main part of the battery system shown in FIG. 3. FIG. 4 is an enlarged cross-sectional view of a main part of the battery system shown in FIG. 3. It is a partially expanded exploded perspective view which shows the laminated structure of a battery cell and an insulating spacer. It is a vertical cross-sectional view of a battery system according to another embodiment of the present invention. It is a perspective view of an elastic plate. It is an expansion perspective view of a binding tool. It is a schematic sectional drawing which shows an example of the assembly process of a battery system. It is a schematic sectional drawing which shows another example of the assembly process of a battery system. It is a schematic sectional drawing which shows another example of the assembly process of a battery system. It is a schematic sectional drawing which shows another example of the assembly process of a battery system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery system manufacturing method for embodying the technical idea of the present invention and a battery system manufactured by this method, and the present invention is a battery system manufacturing method. The method and battery system are not specified as follows. Furthermore, this specification does not limit the members shown in the claims to the members of the embodiments.

  A battery system 100 shown in FIGS. 1 to 5 includes a battery stack block 2 in which a plurality of battery cells 1 are stacked, and a pair of end plates 3 disposed at both ends of the battery stack block 2 in the stacking direction. The elastic plate 9 disposed on the bottom surface of the battery stack 2 and both ends thereof are connected to a pair of end plates 3, and the battery cells 1 of the battery stack 2 are fixed in a pressurized state in the stacking direction. And a binding tool 4 in which an elastic plate 9 is disposed under the battery stack block 2.

  As shown in FIG. 6, the battery cell 1 is a rectangular battery having a rectangular shape with a flat surface 1 </ b> C that is wider and wider than the thickness, and is stacked in the thickness direction to form a battery stack block 2. The battery cell 1 is a non-aqueous electrolyte battery using a battery case 10 as a metal case. The battery cell 1 which is a non-aqueous electrolyte battery is a lithium ion secondary battery. However, the battery cell may be any other secondary battery such as a nickel metal hydride battery or a nickel cadmium battery. The battery cell 1 shown in the figure is a battery having a rectangular outer shape, and is laminated so as to face both sides to form a battery laminated block 2.

  In the battery cell 1, an electrode body (not shown) is accommodated in a metal battery case 10 having a rectangular outer shape of the flat surface 1 </ b> C and filled with an electrolytic solution. The battery case 10 made of a metal case can be made of aluminum or an aluminum alloy. The battery case 10 includes an outer can 10A in which a metal plate is pressed into a cylindrical shape that closes the bottom, and a sealing plate 10B that airtightly closes an opening of the outer can 10A. The sealing plate 10B is a planar metal plate, and its outer shape is the inner shape of the opening of the outer can 10A. The sealing plate 10B is inserted inside the opening of the outer can 10A without a gap, and is welded to the outer can 10A by irradiating a laser between the inner surface of the outer can 10A.

  The battery cell 1 has positive and negative electrode terminals 13 fixed to both ends of the sealing plate 10B, the sealing plate 10B serves as a terminal surface 1A, the surface opposite to the terminal surface 1A, and the lower surface of the battery cell 1 in FIG. 1B. Further, the sealing plate 10B is provided with a gas discharge port 12 in the middle of the positive and negative electrode terminals 13. A discharge valve 11 that opens at a predetermined internal pressure is provided inside the gas discharge port 12. The battery stack block 2 stacks a plurality of battery cells 1 in such a posture that the terminal surface 1A is positioned on the same plane.

  In the battery stack 2, a metal plate bus bar 14 is fixed to the positive and negative electrode terminals 13 of adjacent battery cells 1, and the battery cells 1 are connected in series with each other by the bus bar 14. However, the battery stack can also connect battery cells in series and / or in parallel. A battery system in which adjacent battery cells are connected in series with each other can increase output voltage by increasing output voltage, and can connect adjacent battery cells in parallel to increase charge / discharge current. In the battery stack block 2 of FIG. 6, a linear bus bar 14 </ b> A and an L-shaped bus bar 14 </ b> B are welded and fixed to the electrode terminals 13 of the battery cell 1. The straight bus bar 14A and the L-shaped bus bar 14B are stacked at the tip, provided with a through hole 14a in the laminated portion, a set screw 15 is inserted into the through hole 14a, and a nut 16 is screwed into the set screw 15. The bus bars 14 are fixed to each other.

  The battery stack block 2 shown in FIG. 6 is stacked with an insulating spacer 5 sandwiched between a plurality of battery cells 1. In the illustrated battery stack block 2, adjacent battery cells 1 are arranged in opposite directions, and adjacent electrode terminals 13 on both sides thereof are connected by a bus bar 14 to connect two adjacent battery cells 1 in series. All battery cells 1 are connected in series. However, the present invention does not specify the number of battery cells constituting the battery stack and the connection state thereof.

  The insulating spacer 5 is sandwiched between adjacent battery cells 1 to insulate the battery cells 1 having a potential difference. The insulating spacer is manufactured by molding an insulating plastic. Furthermore, the insulating spacer 5 shown in FIG. 6 is disposed so as to contact the flat surface 1C of the adjacent battery cell 1, and the plate portion 20 sandwiched between the battery cells 1 and the outer peripheral surface of the battery cell 1. Are arranged on the outer peripheral cover portion 21 that fits the battery cell 1 and is connected to a fixed position, and on both side surfaces of the battery stack block 2. Positioning locking portions 27 are provided that are arranged side by side.

  The insulating spacer 5 in FIGS. 3 to 6 is provided with outer cover portions 21 at the four corners of the plate portion 20, that is, both the upper and lower sides, and the four corners of the battery cell 1 are arranged inside the outer cover portion 21, that is, The battery cell 1 is fitted inside the outer peripheral cover portion 21, and the battery cell 1 is arranged at a fixed position of the insulating spacer 5. The outer peripheral cover portion 21 is provided with side cover portions 23 disposed on both sides of the battery cell 1 and on both sides of the battery stack block 2, and end face cover portions 22 that cover the terminal surface 1 </ b> A and the bottom surface 1 </ b> B of the battery cell 1. ing. As shown in the enlarged sectional view of FIG. 4, the end surface cover portion 22 on the terminal side that covers the terminal surface 1 </ b> A of the battery cell 1 has an inner surface as a surface facing the terminal surface 1 </ b> A and an outer surface as a positioning locking portion 27. Lock here to the jig. As shown in the enlarged sectional view of FIG. 5, the end face cover portion 22 that covers the bottom surface 1 </ b> B of the battery cell 1 has an inner surface facing the bottom surface 1 </ b> B of the battery cell 1 and an outer surface that is elastically pressed by the elastic plate 9. The portion 19 is pressed. The end face cover portion 22 on the bottom surface is pressed by the elastic pressing portion 19 of the elastic plate 9 and is in close contact with the bottom surface 1B of the battery cell 1.

  The outer peripheral cover portion 21 has a shape in which the end surface cover portion 22 is connected to the side surface cover portion 23 that covers the side surface of the battery cell 1 at a right angle, and the corner of the battery cell 1 is inside the side surface cover portion 23 and the end surface cover portion 22. The battery cell 1 is placed at a fixed position. Further, the outer surface of the end surface cover portion 22, the upper surface in the figure, is used as the positioning locking portion 27, and the outer surface of the end surface cover portion 22 that places the battery cell 1 in a fixed position is used as the positioning locking portion 27. Since this insulating spacer 5 is provided with a positioning locking portion 27 on the outer peripheral cover portion 21 for fitting and connecting the battery cell 1 at a fixed position, the battery cell 1 is arranged at a fixed position while having a simple shape as a whole. Moreover, each insulating spacer 5 can be arranged on the same plane. However, the insulating spacer does not necessarily need to be provided with the positioning locking portion on the outer peripheral cover portion. For example, a rib may be provided so as to protrude outward from both sides of the plate portion between the upper and lower end surface cover portions, and the positioning locking portion may be provided by the rib.

  Each insulating spacer 5 is arranged on the same plane by pressing the positioning locking portion 27 against the jig. That is, in the step of laminating the insulating spacer 5 and the battery cell 1 and arranging the terminal surface 1A of the battery cell 1 on the same plane, a jig is disposed on the positioning locking portion 27 and the insulating spacer 5 is Alternatively, the battery cell 1 is pressed in the direction of the terminal surface 1A, the positioning locking portion 27 is locked to the jig, and the insulating spacers 5 are arranged on the same plane. The insulating spacers 5 arranged on the same plane are arranged on the same plane with the terminal surfaces 1A of the battery cells 1 which are fitted to the insulating spacers 5 and connected in place. In the illustrated battery system 100, the elastic plate 9 is disposed on the bottom surface of the battery stack 2 and the elastic pressing portion 19 of the elastic plate 9 presses the insulating spacer 5 toward the terminal surface 1A. The insulating spacer 5 to be pressed is arranged on the same plane by pressing the positioning locking portion 27 against the surface of the jig. In the illustrated battery stack block 2, the outer peripheral cover portion 21 of the insulating spacer 5 is disposed on the bottom surface, so that the elastic pressing portion 19 pushes up the outer peripheral cover portion 21 of the insulating spacer 5 and presses the positioning locking portion 27 against the jig. Arrange on the same plane. However, the elastic pressing part can press the battery cell toward the terminal surface, press the insulating spacer via the pressed battery cell, and press the positioning locking part against the jig, so that they can be arranged on the same plane. .

  Further, the insulating spacer 5 of FIGS. 3 and 4 is provided with a cover wall 28 that is separated from the positioning locking portion 27 and extends in parallel therewith, and a locking groove is provided between the positioning locking portion 27 and the cover wall 28. 29. The insulating spacer 5 is formed by integrally forming a vertical wall 24 inside the terminal-side end surface cover portion 22, and is connected to the vertical wall 24 so as to be separated from the end surface cover portion 22 and cover wall 28. A locking groove 29 is formed between the end surface cover portion 22 and the cover wall 28. In this insulating spacer 5, a jig can be disposed in the locking groove 29, and the positioning locking portion 27 can be disposed on the same plane with the jig. The locking groove 29 is a process in which the insulating spacer 5 and the battery cell 1 are stacked, the positioning locking portion 27 of the insulating spacer 5 is arranged on the same plane, and the terminal surface 1A of the battery cell 1 is arranged on the same plane. Place the jig here. In the structure in which the positioning locking portion 27 is arranged inside the locking groove 29, jigs can be arranged on both sides of the battery stack block 2, and the locking groove 29 of the insulating spacer 5 can be guided and stacked on this jig. There is a feature that the battery cells 1 can be stacked simply and easily so as not to come off the jig.

  Further, as shown in FIG. 4, the insulating spacer 5 described above guides the fitting portion 4 </ b> A of the binding tool 4 connected to the end plate 3 to the locking groove 29 and fixes the binding tool 4 to the end plate 3. . In this battery system, a terminal-side end surface cover portion 22 is disposed between the fitting portion 4 </ b> A of the binding tool 4 and the terminal surface 1 </ b> A of the battery cell 1. 4 A of fitting parts of the binding tool 4 arrange | position the terminal surface 1A of the battery cell 1 on the same plane via the end surface cover part 22 by the side of a terminal, and hold | maintain in this state. The battery system 100 has a feature that the fitting part 4A can prevent the positional deviation of the terminal surface 1A of the battery cell 1 in a state where the binding tool 4 is fixed to the end plate 3, that is, in an assembled state. This is because the fitting portion 4 </ b> A guided by the locking groove 29 comes into contact with the positioning locking portion 27 and prevents the displacement of the insulating spacer 5.

  Further, the insulating spacer 5 shown in FIG. 6 has a cooling gap 26 that allows a cooling gas such as air to pass through the plate portion 20 sandwiched between the battery cells 1 in order to effectively cool the battery cells 1. Is provided. The plate portion 20 of the insulating spacer 5 shown in FIG. 6 is provided with grooves 25 extending to both side edges on the surface facing the battery cell 1, and a cooling gap 26 is provided between the battery cell 1. In the insulating spacer 5 shown in the drawing, a plurality of grooves 25 are provided in parallel with each other at a predetermined interval. The plate portion 20 shown in the figure has grooves 25 on both surfaces, and a cooling gap 26 is provided between the battery cell 1 and the insulating spacer 5 adjacent to each other. This structure has an advantage that the battery cells 1 on both sides can be effectively cooled by the cooling gaps 26 formed on both sides of the plate portion 20. However, the insulating spacer can be provided with a groove only on one side, and a cooling gap can be provided between the battery cell and the insulating spacer. The cooling gap 26 in the figure is provided in the horizontal direction so as to open to the left and right of the battery stack block 2. The air forcedly blown into the cooling gap 26 directly and efficiently cools the outer can 10 </ b> A of the battery cell 1. This structure is characterized in that the battery cell 1 can be efficiently cooled while effectively preventing thermal runaway of the battery cell 1.

  The insulating spacer 5 described above can cool the battery cell 1 by providing a cooling gap 26 between the battery cell 1 and forcibly blowing a cooling gas such as cooling air into the cooling gap 26. However, it is not always necessary for the insulating spacer to provide a cooling gap with the battery cell. As shown in FIG. 7, the elastic plate 9 stacked on the bottom surface of the battery stack block 2 is thermally coupled to the cooling plate 30. It can also be set as the structure connected. The battery system 200 can cool the cooling plate 30, cool the elastic plate 9 with the cooling plate 30, and cool the battery cell 1 via the elastic plate 9. The cooling plate 30 can be cooled by providing radiating fins (not shown) on the surface, or can be forcibly cooled by circulating a cooling refrigerant or coolant inside.

  The battery cell 1 is pressed toward the terminal surface 1 </ b> A by an elastic arm 19 </ b> A that is an elastic pressing portion 19 through an end surface cover portion 22 on the bottom surface side. The end surface cover portion 22 on the bottom surface side is in a state in which the inner surface is in close contact with the bottom surface 1B of the battery cell 1 and the outer surface is pressed by the elastic arm 19A. The elastic arm 19A presses the insulating spacer 5 via the end face cover portion 22 on the bottom surface side, arranges the positioning locking portion 27 of the insulating spacer 5 on the same plane, and the terminal surface 1A of the battery cell 1 on the same plane. To place.

  The elastic plate 9 is disposed on the bottom surface of the battery stack 2, that is, the bottom surface 1 </ b> B of the battery cell 1, and has an elastic pressing portion 19 that elastically presses each battery cell 1 from the bottom surface 1 </ b> B toward the terminal surface 1 </ b> A. . The elastic plate 9 shown in FIGS. 3 and 8 is formed by cutting a metal plate such as stainless steel that can be elastically deformed, and pressing the elastic plate 19 to form a plurality of elastic arms 19A as elastic pressing portions 19 in an integrated structure. Further, the elastic plate 9 of FIGS. 3 and 8 is provided with a pair of elastic arms 19 </ b> A extending in the longitudinal direction of the bottom surface 1 </ b> B of the battery cell 1. The pair of elastic arms 19 </ b> A are connected to the elastic plate 9 at both sides of the elastic plate 9, and are provided so as to extend from both sides of the elastic plate 9 toward the center. The illustrated elastic plate 9 includes a rectangular outer peripheral frame portion 9A that follows the outer shape of the bottom surface of the battery stack block 2, and a plurality of elastic arms 19A extending inward from both side portions of the outer peripheral frame portion 9A are integrally formed. Provided. The elastic arm 19A is bent into a shape protruding toward the bottom surface 1B of the battery cell 1 toward the tip. A pair of elastic arms 19 </ b> A provided on both sides of the elastic plate 9 presses the bottom surface 1 </ b> B of one battery cell 1. Therefore, the interval between the adjacent elastic arms 19A is equal to the interval between the stacked battery cells 1, and a plurality of elastic arms 19A are provided on both sides of the elastic plate 9.

  Further, the elastic plate 9 shown in FIGS. 3 and 8 is provided with reinforcing ribs 9B along both side edges of the outer peripheral frame portion 9A. The elastic plate 9 shown in the figure is provided with reinforcing ribs 9B by bending both side edges of the outer peripheral frame portion 9A upward. The elastic plate 9 can increase the rigidity of both side portions of the outer peripheral frame portion 9A by the reinforcing ribs 9B provided on both side edges. The elastic plate 9 having this structure is characterized in that it can be pressed without deforming both side portions of the outer peripheral frame portion 9A in a state of pressing both side portions and elastically deforming the elastic pressing portion 19 in the battery system assembly process. Further, the illustrated elastic plate 9 has a structure in which the inner surfaces of the reinforcing ribs 9B provided on both side edges of the outer peripheral frame portion 9A are in contact with the outer surface of the lower corner portion of the battery stack 2. The elastic plate 9 has a feature that it can be placed at a fixed position while positioning the left and right positions with the reinforcing ribs 9B on both sides with respect to the bottom surface of the battery stack 2.

  The end plate 3 is connected to the binding tool 4 and pressurizes the battery stack block 2 from both end surfaces to fix the battery cell 1 in a pressurized state in the stacking direction. The outer shape of the end plate 3 is substantially the same as or slightly larger than the outer shape of the battery cell 1, and the battery stacking block 2 is fixed in a pressurized state by connecting the binding tools 4 to the four corners so as not to be deformed. It is a plate shape. This end plate 3 connects the binding tool 4 to the four corners, is in close contact with the surface of the battery cell 1 in a surface contact state, and fixes the battery cell 1 in a pressurized state with a uniform pressure. In the battery system, end plates 3 are arranged at both ends of the battery stack 2 and the end plates 3 at both ends are pressed by a press machine (not shown) to hold the battery cells 1 in the stacking direction. In this state, the binder 4 is fixed to the end plate 3, and the battery stack 2 is held and fixed at a predetermined tightening pressure. After the end plate 3 is connected to the binding tool 4, the pressurization state of the press machine is released.

  As shown in FIGS. 1 and 2, the binding tool 4 is connected to the end plates 3 at both ends of the battery stack block 2 to fix the plurality of battery cells 1 in a pressed state in the stacking direction. The binding tool 4 is manufactured by pressing a metal plate. As shown in FIG. 9, the binding tool 4 includes a side plate 4 </ b> X disposed on the side surface of the battery stack block 2, and an L disposed on the outer surface of the end plate 3 at both ends of the side plate 4 </ b> X. The L-shaped fixing portion 4C is fixed to the outer end surface of the end plate 3 via a set screw 18.

  Furthermore, the binding tool 4 includes a fitting portion 4A guided by the locking groove 29 of the insulating spacer 5 and a locking portion 4B disposed outside the elastic plate 9. The battery stack block 2 in which the elastic plate 9 is stacked on the bottom surface 1B is disposed between the fitting portion 4A and the locking portion 4B. In the drawing, the binding tool 4 is provided with a fitting part 4A by bending the upper edge of the side plate 4X inward at a right angle, and is provided with a locking part 4B by bending the lower edge at a right angle. Further, the side plate 4X is lightened by providing a cut portion 4D inside the outer peripheral edge portion. The side surface plate 4X in FIG. 9 reinforces the frame frame 4E by connecting a rectangular frame frame 4E at the outer peripheral edge in the vertical and horizontal directions with a connecting bar 4F.

  The fitting portion 4 </ b> A has a flat inner surface, is guided by the locking groove 29 of the insulating spacer 5, contacts the positioning locking portion 27, and connects the terminal surface 1 </ b> A of each battery cell 1 via the insulating spacer 5. Arrange on the same plane. In the battery system 100 of FIG. 3, the end surface cover portion 22 of the insulating spacer 5 is disposed on the terminal surface 1 </ b> A of the battery cell 1, and the outside of the end surface cover portion 22 is used as a positioning locking portion 27. Therefore, the battery system 100 is arranged such that the end surface cover portion 22 of the insulating spacer 5 is sandwiched between the terminal surface 1A and the fitting portion 4A. The terminal surface 1 </ b> A of the battery cell 1 is pressed against the fitting portion 4 </ b> A via the end surface cover portion 22 and arranged on the same plane.

  The locking portion 4B is outside the elastic plate 9, below the elastic plate 9 in FIG. 3, and holds the elastic plate 9 in a state of being elastically deformed so as to push up the elastic plate 9 and crush the elastic pressing portion 19 of the elastic plate 9. . The elastic plate 9 pressed against the bottom surface of the battery stack 2 by the locking portion 4B presses the insulating spacer 5 with the restoring force of the elastic pressing portion 19 that is elastically deformed, and the positioning locking portion 27 of the insulating spacer 5 Are arranged in the same plane, and the terminal surface 1A of the battery cell 1 is arranged in the same plane. The battery system 100 of FIG. 3 arrange | positions the end surface cover part 22 of the insulating spacer 5 between the elastic plate 9 and the bottom face 1B of the battery cell 1. Therefore, the elastic pressing portion 19 presses the insulating spacer 5 via the end surface cover portion 22, and the battery cell 1 terminal surface 1 </ b> A is arranged on the same plane via the insulating spacer 5.

  The inner distance between the fitting portion 4A and the locking portion 4B is such that the battery stack 2 having the elastic plate 9 disposed on the bottom surface 1B is disposed and the elastic pressing portion 19 of the elastic plate 9 is crushed and elastically deformed. . In the battery system in which the outer peripheral cover portion 21 of the insulating spacer 5 is disposed between the fitting portion 4A and the locking portion 4B and the battery cell 1, the inner space between the fitting portion 4A and the locking portion 4B is insulated vertically. The outer peripheral cover portion 21 of the spacer 5 is stacked and the battery stack block 2 in which the elastic plate 9 is disposed on the bottom surface 1B is disposed, and the elastic pressing portion 19 of the elastic plate 9 is crushed and elastically deformed.

  Further, as shown in FIG. 9, the binding tool 4 holds the elastic pressing portion 19 in a crushed state when the elastic plate 9 and the battery stack 2 are inserted between the fitting portion 4A and the locking portion 4B. A notch 4a for guiding the pressure jig is provided in both the fitting portion 4A and the locking portion 4B. In the illustrated binding tool 4, the notch 4 a is provided in both the fitting part 4 </ b> A and the locking part 4 </ b> B, but it is not always necessary to provide the notch in both the fitting part and the locking part. A notch can also be provided on one of the locking portions. That is, the battery stack block is pressed with a pressure jig, or the elastic plate is pressed to hold the elastic pressing portion, and the elastic plate is stacked while guiding the notch to the pressure jig. This is because the battery stack can be inserted between the fitting portion and the locking portion.

  Furthermore, the binding tool 4 of FIG. 9 is provided with notches 4a at both ends of the fitting portion 4A and the locking portion 4B. A pressure jig that presses the battery stack 2 and crushes the elastic pressing portion 19 of the elastic plate 9 through the end face cover portion 22 on the terminal side of the insulating spacer 5 is guided to the notch 4a of the fitting portion 4A. The A pressure jig that presses the elastic plate 9 to crush the elastic pressing portion 19 is guided to the notch 4a of the locking portion 4B. The elastic pressing portion 19 crushed by the pressure jig presses the battery stack block 2 via the end surface cover portion 22 on the bottom surface side of the insulating spacer 5.

  In the above-described binding tool 4, a notch 4 a is provided at a position where the end spacers 5 ′ stacked on both ends of the battery stack block 2 are pressed with a pressure jig. The end spacer 5 ′ is disposed so as to be sandwiched between the end plate 3 and the outermost stacked battery cell 1 ′ stacked at both ends of the battery stack block 2.

  The binding tool 4 provided with the notches 4a at both ends is configured to apply stress concentrated on the corners of the side plate 4X with the notches 4a at both ends in a state where the fixing portion 4C is fixed to the outside of the end plate 3. Dispersion can prevent damage to the side plate 4X. Since the binding tool 4 of FIG. 9 is provided with the notches 4a at both ends of the fitting portion 4A and the locking portion 4B, the stress concentrated on the upper and lower corner portions of the side plate 4X is dispersed, There is a feature that can prevent damage to the four corners of the plate 4X.

  Furthermore, the binding tool 4 of FIG. 9 is provided with a separation gap 4b between the L-shaped fixing portion 4C and the fitting portion 4A and the locking portion 4B. The binding tool 4 having this shape can be produced in large quantities at a low cost by pressing a metal plate. Further, the binding tool 4 can be produced at both the notch 4a provided in the fitting portion 4A and the locking portion 4B and the separation gap 4b. Therefore, the stress concentration acting on the four corners of the side plate 4X can be more effectively prevented and dispersed, and damage to this portion can be more effectively prevented.

The above battery system 100 is assembled in the following steps.
(1) The battery cell 1 and the insulating spacer 5 are alternately laminated on the elastic plate 9 arranged in a horizontal posture to form the battery laminated block 2. As shown in FIG. 10A, the jig 50 is guided to the locking grooves 29 of the insulating spacers 5 arranged on both sides of the battery stack block 2, and the jig 50 is pressed against the positioning locking portion 27. The jig 50 presses the insulating spacer 5 in a direction in which the elastic arm 19A of the elastic plate 9 is crushed. The crushed elastic arm 19 </ b> A presses the positioning locking portion 27 of the insulating spacer 5 against the jig 50. In this state, the positioning locking portion 27 of the insulating spacer 5 is disposed on the same plane by the jig 50. The insulating spacers 5 arranged on the same plane arrange the terminal surfaces 1A of the battery cells 1 connected thereto on the same plane.

(2) The jig 50 holds the battery cell 1 terminal surface 1A in the same plane, the end plates 3 are arranged at both ends of the battery stack block 2, and the battery stack block 2 is placed in the stacking direction by the end plates 3. Pressure is applied to fix the insulating spacer 5 and the battery cell 1 in a state where they are not relatively moved by frictional resistance, and the jig 50 is removed from the locking groove 29. The end plate 3 is pressed by a cylinder (not shown) or the like to pressurize the battery stack block 2.

(3) As shown in FIG. 10 (b), the elastic plate 9 stacked on the bottom of the battery stack block 2 is locked to the locking portion 4B of the binding device 4 and the fitting portion 4A At the position where the notches 4a provided at both ends are guided, the battery stack 2 is pressed with the pressure jig, more precisely, the end face cover portion 22 on the terminal side of the insulating spacer 5 (indicated by arrow A in the figure). Then, the battery stack block 2 is pushed down, and the elastic arm 19A, which is the elastic pressing portion 19 of the elastic plate 9, is crushed. In this state, the fitting portion 4 </ b> A of the binding tool 4 is inserted into the locking groove 29 of the insulating spacer 5. When the fitting portion 4A is inserted into the locking groove 29, the pressure jig is guided to the notch 4a of the fitting portion 4A. In other words, the fitting portion 4A is inserted into the locking groove 29 in such a state that the battery stack 2 is pressed with a pressure jig to crush the elastic arm 19A. In the battery system 100 in which the battery stack 2 and the elastic plate 9 are inserted between the fitting portion 4A and the locking portion 4B of the binding device 4, the crushed elastic arm 19A elastically pushes the insulating spacer 5. By pressing, the positioning locking portion 27 of the insulating spacer 5 is pressed against the fitting portion 4A, and the terminal surface 1A of the battery cell 1 is arranged on the same plane. The assembled battery system 100 holds the battery cell 1 in a pressurized state by the end plate 3 and prevents the relative movement of the battery cell 1 and the insulating spacer 5 by frictional resistance. Further, in the battery system 100 described above, since the elastic arm 19A holds the positioning locking portion 27 elastically against the fitting portion 4A, the battery cell 1 is relatively moved by vibration of the battery system 100 or the like. Even if it becomes, terminal surface 1A of the battery cell 1 is arrange | positioned on the same plane.

  In the above method, at the position where the notch 4a of the fitting portion 4A is guided, the battery stack block 2 is pressed by the pressure jig to crush the elastic arm 19A, but the notch 4a of the locking portion 4B is guided. The elastic plate 19 can also be crushed by pressing the elastic plate 9 with a pressure jig at the position to be pressed. In this method, as shown in FIG. 11 (b), the notch 4a of the locking portion 4B guides in a state where the locking portion 29 of the battery stack 2 is locked to the fitting portion 4A of the binding tool 4. The elastic plate 9 is pressed with a pressure jig (indicated by an arrow B in the figure) at a position where the elastic plate 9 is pressed against the battery stack 2, and the elastic arm 19 </ b> A that is the elastic pressing portion 19 of the elastic plate 9 is pressed. Hold in a crushed state. In this state, the battery stack 2 and the elastic plate 9 are inserted inside the locking portion 4B. In a state where the elastic plate 9 is inserted inside the locking portion 4B, the pressure jig pressing the elastic plate 9 is guided to the notch 4a of the locking portion 4B. Therefore, the battery stack block 2 and the elastic plate 9 can be inserted inside the locking portion 4B while pressing the elastic plate 9 with a pressure jig.

(4) The battery stack block 2 and the elastic plate 9 are inserted in a stacked state between the fitting portion 4A and the locking portion 4B of the binding tool 4, and the L-shaped fixing portion 4C of the binding tool 4 in this state. Is fixed to the outside of the end plate 3. Thereafter, the state in which the pressure jig presses the battery stack 2 and the elastic plate 9 is released.

  In the above method, the battery stack 2 is mounted on the elastic plate 9 and assembled. However, the above method may be reversed and the elastic plate 9 may be mounted on the battery stack 2 and assembled. In this method, a battery system is assembled as follows.

(1) Battery cells 1 and insulating spacers 5 are alternately stacked to form a battery stack block 2. As shown in FIG. 12A, jigs 50 are arranged in the locking grooves 29 on both sides of the battery stack block 2, and the elastic plate 9 is placed on the battery stack block 2. In this state, the positioning locking portion 27 of the insulating spacer 5 is placed on the jig 50 and the insulating spacers 5 are arranged on the same plane. Each insulation spacer 5 arrange | positions the terminal surface 1A of the battery cell 1 connected to this on the same plane.

(2) The end plates 3 are disposed at both ends of the battery stack block 2, the outside of the end plate 3 is pressed with a cylinder (not shown), etc., and the battery stack block 2 is pressed in the stacking direction. The battery cell 1 is fixed in a state where it does not move relative to the frictional resistance.

(3) After the jig 50 is removed from the locking groove 29 of the battery stack 2, the fitting portion 4 </ b> A of the binding tool 4 is inserted into the locking groove 29 as shown in FIG. The elastic plate 9 is pressed against the battery stack 2 with a pressure jig (indicated by an arrow B in the drawing) at positions guided by the notches 4a provided at both ends of the locking portion 4B. The elastic arm 19A which is the pressing part 19 is crushed. In this state, the battery stack 2 and the elastic plate 9 are inserted inside the locking portion 4B. In a state where the elastic plate 9 is inserted inside the locking portion 4B, the pressure jig pressing the elastic plate 9 is guided to the notch 4a of the locking portion 4B. Therefore, the elastic plate 9 is inserted inside the locking portion 4B while pressing the elastic plate 9 with a pressure jig.

  In the above method, the position guided by the notch 4a of the locking portion 4B is pressed with a pressure jig to push down the elastic plate 9, but at the position where the notch of the fitting portion is guided by the following method, The battery stack can be pushed up with a pressure jig to crush the elastic arm. Although this method is not shown, in the state where the elastic plate is locked to the locking portion of the binding tool, the position where the notch of the fitting portion is guided is pressed with a pressure jig to push up the battery stack block, Hold the elastic arm of the elastic plate in a crushed state. In this state, the fitting portion is inserted into the locking groove of the battery stack block on which the elastic plate is stacked. In a state where the fitting portion is inserted into the engaging groove of the battery stack block, the pressure jig that presses the battery stack block is guided to the notch of the fit portion. Therefore, while pushing up the battery stack with the pressure jig, the elastic plate can be arranged inside the locking portion, and the fitting portion can be inserted into the locking groove of the battery stack.

(4) The battery stack block 2 and the elastic plate 9 are inserted in a stacked state between the fitting portion 4A and the locking portion 4B of the binding device 4, and in this state, the L-shaped fixing portion of the binding device 4 4C is fixed to the outside of the end plate 3. Thereafter, the state in which the pressure jig presses the battery stack 2 and the elastic plate 9 is released.

  Further, as shown in FIG. 13B, the battery system presses both the battery stack block 2 and the elastic plate 9 with a pressure jig to crush the elastic arm 19A, and in this state, the fitting portion 4A is It can be inserted into the locking groove 29 and the locking portion 4B can be arranged outside the elastic plate 9 for assembly. In this assembling method, the elastic plate 9 is laminated on the battery lamination block 2, the positioning locking portion 27 of the insulating spacer 5 is applied to the jig 50, and the terminal surface 1 </ b> A of the battery cell 1 is arranged on the same plane via the insulating spacer 5. In this state, both ends of the battery stack block 2 are pressed and fixed by the end plate 3, and then the battery stack block 2 and the elastic plate 9 are pressed by four pressure jigs to crush the elastic arm 19 </ b> A. State. The four pressure jigs are formed in the notches of the fitting portion 4A and the locking portion 4B in a state where the fitting portion 4A is inserted into the locking groove 29 and the locking portion 4B is moved to the outside of the elastic plate 9. At the guided position (indicated by arrows A and B in the figure), the battery stack 2 and the elastic plate 9 are pressed. The four pressure jigs are inserted into the engaging groove 29 and the elastic plate 9 is inserted inside the engaging portion 4B, and then pulled out from the notch, so that the battery stack block 2 and the elastic plate are inserted. 9 is removed from the surface.

  The battery system described above is most suitable for a power supply device that supplies electric power to a motor that drives an electric vehicle. However, the present invention does not specify the use of the battery system as a power supply device mounted on an electric vehicle, and can be used, for example, as a power supply device that stores natural energy such as solar power generation or wind power generation, and stores midnight power. Like power supply devices such as power supply devices, it is optimal for all applications that store large amounts of power.

  The battery system of the present invention is optimally used for a power supply device that supplies electric power to a motor of a vehicle that requires a large amount of power, or a power storage device that stores natural energy or midnight power.

DESCRIPTION OF SYMBOLS 100, 200 ... Battery system 1 ... Battery cell 1 '... Endmost laminated battery cell 1A ... Terminal surface 1B ... Bottom surface 1C ... Flat surface 2 ... Battery laminated block 3 ... End plate 4 ... Binder 4X ... Side plate 4A ... Fitting Part 4B ... Locking part 4C ... L-shaped fixed part 4D ... Cut part 4E ... Frame frame 4F ... Connection bar 4a ... Notch 4b ... Separation gap 5 ... Insulating spacer 5 '... End spacer 9 ... Elastic plate 9A ... Outer frame Part 9B ... Reinforcing rib 10 ... Battery case 10A ... Exterior can 10B ... Sealing plate 11 ... Exhaust valve 12 ... Gas exhaust port 13 ... Electrode terminal 14 ... Bus bar 14A ... Linear bus bar 14B ... L-shaped bus bar 14a ... Through hole DESCRIPTION OF SYMBOLS 15 ... Set screw 16 ... Nut 18 ... Set screw 19 ... Elastic press part 19A ... Elastic arm 20 ... Plate part 21 ... Outer peripheral cover part 22 ... End surface cover Part 23 ... side cover 24 ... vertical wall 25 ... groove 26 ... Cooling gap 27 ... positioning locking part 28 ... cover wall 29 ... locking groove 30 ... cooling plate 50 ... jig

Claims (10)

A plurality of battery cells with terminal surfaces provided with positive and negative electrode terminals arranged in the same plane are stacked with an insulating spacer in between, and the adjacent battery cell is electrically connected with a bus bar fixed to the electrode terminal of the battery cell. A battery stack formed by connection;
An elastic plate having an elastic pressing portion that is disposed on the bottom surface of the battery stack located on the opposite side of the terminal surface and elastically presses the battery cell toward the terminal surface;
A pair of end plates at both ends of the battery stack, wherein the battery cells are pressed and fixed in the stacking direction;
A battery system manufacturing method comprising: a binding tool connected to a pair of end plates and fixing a plurality of battery cells in a pressurized state with the end plates,
In the manufacturing process of the insulating spacer, the outer peripheral cover portion that fits the battery cell and places the battery cell in a fixed position, and the battery cell through the insulating spacer that has the insulating spacer placed in a fixed position. Positioning positioning portions that are arranged on the same plane are arranged on both side surfaces of the battery stack,
In the step of laminating the insulating spacer and the battery cell and arranging the terminal surfaces of the battery cell on the same plane, a jig is arranged on the positioning locking portion, and the insulating spacer or the battery is formed by the elastic pressing portion. The cell is pressed in the direction of the terminal surface, and the terminal surface of the battery cell is disposed on the same plane through the insulating spacer disposed at a fixed position by locking the positioning locking portion to a jig.
A battery system manufacturing method for connecting the binding tool to the end plates arranged at both ends of the battery stack block in a state where the terminal surfaces of the battery cells are arranged on the same plane. A method of manufacturing a battery system according to claim 1,
The outer peripheral cover portion of the insulating spacer is provided with side cover portions disposed on both sides of the battery cell, and an end surface cover portion that covers the terminal surface of the battery cell, and an inner surface of the end surface cover portion is connected to the terminal surface. A battery system manufacturing method in which an outer surface of an end surface cover portion is a positioning locking portion as an opposing surface. A method of manufacturing a battery system according to claim 1 or 2,
The binding tool is connected to a pair of end plates, and the battery stack block is fixed in a pressed state in the battery cell stacking direction with the binding tool, and then the bus bar is fixed to the electrode terminal of the battery cell. A battery system manufacturing method characterized by the above. A method of manufacturing a battery system according to claim 1 or 2,
A cover wall extending away from the positioning locking portion and extending in parallel with the positioning locking portion is provided, and a locking groove is formed between the positioning locking portion and the cover wall, and a jig is disposed in the locking groove, and the positioning locking is performed. The manufacturing method of the battery system which arrange | positions a part on the same plane with a jig. A method of manufacturing a battery system according to claim 4,
A battery system comprising a fitting portion guided in the locking groove in the binding tool, the fitting portion being inserted into the locking groove, and the binding tool being connected to the end plate. Manufacturing method. A method for manufacturing a battery system according to any one of claims 1 to 4,
The method of manufacturing a battery system, wherein the elastic pressing portion presses the outer peripheral cover portion, and the positioning locking portion is arranged on the same plane with a jig. A plurality of battery cells with positive and negative electrode terminals provided on the terminal surface are stacked with an insulating spacer in between, and each battery cell is electrically connected via a bus bar fixed to the electrode terminal of each battery cell A battery stack,
An elastic plate that is disposed on the bottom surface of the battery stack and has an elastic pressing portion that elastically presses the battery cell from the bottom surface toward the terminal surface;
A pair of end plates at both ends in the stacking direction of the battery stack, the battery cells being pressed and fixed in the stacking direction;
A battery system connected to a pair of end plates and including a binding tool configured to fix a plurality of battery cells in a pressurized state,
The insulating spacer includes the outer peripheral cover portion that covers the both side surfaces of the battery stacking block, and the insulating spacer is positioned at a fixed position by fitting the battery stacking block to the fixed position. Positioning positioning portions for arranging the terminal surfaces of the battery cells in the same plane are provided on both side surfaces of the battery stack block ,
Furthermore, the battery wherein the insulating spacer, a cover wall extending parallel thereto away from the positioning locking part, characterized by Rukoto such as locking groove between the positioning locking part and the cover wall system. A battery system according to claim 7,
The outer peripheral cover portion of the insulating spacer has an end surface cover portion that covers the terminal surface of the battery cell. The end surface cover portion has an inner surface facing the terminal surface, and an outer surface that is a positioning member. A battery system characterized by being a stop. The battery system according to claim 7 or 8 ,
The battery is characterized in that the binding tool includes a fitting portion guided by the locking groove, and the fitting portion is inserted into the locking groove and the binding tool is connected to the end plate. system. A battery system according to any one of claims 7 to 9 ,
The battery system, wherein the elastic pressing portion presses an outer peripheral cover portion provided on the insulating spacer, and the terminal surfaces are arranged on the same plane.

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