JP7366636B2 - Power supply device, electric vehicle equipped with this power supply device, and power storage device - Google Patents

Description

The present invention relates to a power supply device in which a plurality of battery cells are stacked to form a battery stack and both ends of the battery stack are pressed and fixed by end plates, an electric vehicle equipped with the power supply device, and a power storage device.

The power supply device is used as a power supply device for driving an electric vehicle, a power supply device for storing electricity, and the like. Such a power supply device has a plurality of stacked rechargeable and dischargeable secondary battery cells. Generally, as shown in the exploded perspective view of FIG. 13, a power supply device 900 has battery cells 901 in square outer cans placed on both end faces of a battery stack 910 that is alternately stacked with insulating spacers 902. , end plates 903 are arranged respectively, and the end plates 903 are fastened together with a metal bind bar 904. The bind bar 904 shown in the figure is made of a metal plate extending in the stacking direction of the battery cells 901, and a fixing piece 907 formed by bending both ends of the metal plate is attached to the outside of the end plate 903. A pair of end plates 903 are fixed to the main surface 903A and fastened by left and right bind bars 904. A fixing piece 907 of the bind bar is fixed to the end plate 903 via a bolt 908.

However, in this configuration, as shown in the front view of FIG. 14, when the bind bar 904 is fastened, if the bolt 908 is screwed in and fixed with strong rotational torque, the relative posture of the bind bar 904 and the battery stack 910 is There was a possibility that the bind bar 904 and the battery stack 910 would be twisted, and the size of the power supply device would exceed the standard.

On the other hand, instead of screwing with bolts, fixing using rivets may also be considered. According to this fixing structure, as shown in FIG. 15, the cylindrical portion 809a of the rivet 809 before crimping is inserted through the fixing piece 807 and the end plate 803, and the center rod 809b passes through the cylindrical portion 809a. By pulling the cylinder part 809a, the end plate 803 and the fixing piece 807 are clamped and fixed by the flange part 809c disposed on the outside of the fixing piece 807 and the forming flange part 809d formed by caulking. There is. However, in this case, as shown in FIG. 15, in order to sandwich the fixing piece 807 and the end plate 803 with the rivets 809, it is necessary to partially thin the shape of the end plate 803, and the inner main surface 803A In addition, since it was necessary to provide a recess 803a for inserting the cylindrical portion 809a before caulking, there was a problem that the strength was reduced in this portion.

Japanese Patent Application Publication No. 9-120808

One object of the present invention is to provide a technique that can prevent the bind bar and the battery stack from being distorted or twisted by fixing the bind bar at a predetermined position on the end plate in a correct posture.

A power supply device according to an embodiment of the present invention includes a battery stack 10 formed by stacking a plurality of battery cells 1, a pair of end plates 3 disposed on both end faces of the battery stack 10 in the stacking direction, and a battery stack 10 formed by stacking a plurality of battery cells 1. A plurality of bind bars 4 are provided on opposite sides of the body 10 to fasten the end plates 3 together. The bind bar 4 includes a plate bar 6 extending in the stacking direction of the battery stack 10 and locking blocks 5 fixed to both longitudinal ends of the plate bar 6 and protruding toward the end plate 3. At the same time, fixing pieces 7 fixed to the outer main surfaces 3A of the pair of end plates 3 opposite to the opposing surfaces are provided at both ends. The end plate 3 has a fitting part 3a on both sides, through which the locking block 5 is guided, and a stopper part 5b of the locking block 5 is provided on the battery stack 10 side of the fitting part 3a. Further, the outer main surface 3A is provided with a plurality of connecting convex portions 8 protruding from the main surface 3A at positions facing the fixing pieces 7. The fixing piece 7 has a through hole 7a through which the connecting protrusion 8 passes, and further includes a locking tool 9 fixed to the connecting protrusion 8 passing through the fixing piece 7. In the power supply device, the locking block 5 is guided to the fitting part 3a, and the connecting protrusion 8 is inserted into the through hole 7a of the fixing piece 7, and the locking tool 9 is connected to the connecting protrusion 8. A bind bar 4 is fixed to the end plate 3.

An electric vehicle according to an embodiment of the present invention includes the power supply device 100 , a motor 93 for driving to which power is supplied from the power supply device 100 , a vehicle body 91 equipped with the power supply device 100 and the motor 93 , and a motor 93 . The vehicle body 91 is driven by wheels 97 to cause the vehicle body 91 to travel.

A power storage device according to an embodiment of the present invention includes the power supply device 100 described above and a power supply controller 88 that controls charging and discharging of the power supply device 100. It enables charging and controls the battery cell 1 to be charged.

According to the above power supply device, it is possible to fix the bind bar at a predetermined position on the end plate in a correct posture and prevent distortion or twisting of the bind bar and the battery stack, while having a simple structure.

1 is a perspective view of a power supply device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the power supply device shown in FIG. 1. FIG. 2 is a sectional view taken along line III-III of the power supply device shown in FIG. 1. FIG. FIG. 4 is an enlarged cross-sectional view of a main part of the power supply device shown in FIG. 3; It is an expanded sectional view showing another example of an end plate. It is a connection structure which connects a fixed piece to an end plate, Comprising: It is a perspective view which shows an example of a locking tool. It is a connection structure which connects a fixed piece to an end plate, Comprising: It is a perspective view which shows another example of a locking tool. It is a connection structure which connects a fixed piece to an end plate, Comprising: It is a perspective view which shows another example of a locking tool. It is a connection structure which connects a fixed piece to an end plate, Comprising: It is sectional drawing which shows another example of a locking tool. FIG. 2 is a block diagram showing an example in which a power supply device is installed in a hybrid vehicle that runs using an engine and a motor. FIG. 2 is a block diagram showing an example in which a power supply device is mounted on an electric vehicle that runs only by a motor. FIG. 2 is a block diagram illustrating an example of using a power supply device as a power storage device. FIG. 2 is an exploded perspective view of a conventional power supply device. It is a front view of a conventional power supply device, and is a figure showing a state where a fixed piece is fixed to an end plate with a bolt. FIG. 3 is a horizontal cross-sectional view of another conventional power supply device.

A power supply device according to a first embodiment of the present invention includes a battery stack formed by stacking a plurality of battery cells, a pair of end plates arranged on both end faces of the battery stack in the stacking direction, and a battery stack. A plurality of bind bars are arranged on opposing sides of the end plate and fasten the end plates to each other. The bind bar includes a plate-shaped bar extending in the stacking direction of the battery stack, and locking blocks fixed to both ends of the plate-shaped bar in the longitudinal direction and protruding toward the end plate. It has fixing pieces on both ends that are fixed to the outer main surface. The end plate has fitting parts on both sides for guiding the locking block, and a stopper part for the locking block is provided on the battery stack side of the fitting part, and furthermore, a stopper part for the locking block is provided on the outer main surface. , a plurality of connecting protrusions protruding from the main surface are provided at positions facing the fixing piece. The fixing piece has a through hole that passes through the connecting protrusion, and further includes a locking tool that is fixed to the connecting protrusion that passes through the fixing piece. In the power supply device, when the locking block is guided to the fitting part and the connecting protrusion is inserted into the through hole of the fixing piece, the locking tool is connected to the connecting protrusion and the bind bar is fixed to the end plate. has been done.

With the above configuration, by not using conventional bolt threading to fix the end plate and the bind bar, it is possible to avoid distortion or twisting of the fixing pieces etc. due to rotational torque and cause changes in the physique. Stable fixation can be achieved. In particular, in the above power supply device, the expansion force of the battery stack is not received by the fixing pieces provided at both ends of the bind bar, but by locking blocks fixed at both ends of the bind bar with the stopper part. Therefore, the fixing piece fixed to the outer main surface of the end plate does not require strong connection strength, and is held by a locking tool that can be simply and easily locked. Therefore, the fixing piece can be fixed to the end plate by a simple operation of connecting the locking tool to the connecting convex portion, and the efficiency of the assembly operation can also be improved.

In the power supply device according to the second embodiment of the present invention, the connecting convex portion is integrally molded on the end plate.

In the power supply device according to the third embodiment of the present invention, the connecting convex portion is constituted by a fixing pin fixed to the end plate.

In the power supply device according to the fourth embodiment of the present invention, the connecting convex portion is formed in a cylindrical shape, and an outer circumferential groove for guiding a locking tool is formed on the outer circumferential surface of the column.

With the above configuration, by guiding and locking the locking tool to the outer peripheral groove, the locking tool fixed to the outer peripheral groove moves in the axial direction while connecting the locking tool to the fixed position of the connecting convex part. The fixing piece can be stably held in place by preventing this.

In the power supply device according to the fifth embodiment of the present invention, the locking tool is formed in an annular shape with a portion opened, and when the connecting projection is inserted into the through hole, the opening of the locking tool is connected to the connecting projection. The bind bar is fixed to the end plate by press-fitting into the end plate.

In the power supply device according to the sixth embodiment of the present invention, the locking tool is a snap ring or an E-ring that is press-fitted into the connecting convex portion.

In the above power supply device, the fixing piece can be fixed through a thin plate-shaped locking device without using a bolt with a large screw head, etc., as in the past, so that it does not come off from the connecting protrusion, so the power supply device The external shape can be made even more compact. Furthermore, weight reduction can be achieved by using a fastener made of a thin metal plate instead of a bolt.

In the power supply device according to the seventh embodiment of the present invention, the locking tool is a speed nut having an opening into which the connecting projection is press-fitted.

In the above power supply device, the fixing piece can be fixed through a thin plate-shaped locking device without using a bolt with a large screw head, etc., as in the past, so that it does not come off from the connecting protrusion, so the power supply device The external shape can be made even more compact. Furthermore, weight reduction can be achieved by using a fastener made of a thin metal plate instead of a bolt.

In the power supply device according to the eighth embodiment of the present invention, the connecting convex portion is formed in a cylindrical shape, and a convex through hole is formed on the outer peripheral surface of the column, and the locking tool is inserted through the convex portion. It is a snap pin that is press-fitted into the hole.

With the above configuration, the bind bar can be fixed to the end plate by the simple operation of press-fitting the snap pin into the convex through-hole, thereby improving the efficiency of the assembly work of the power supply device.

In the power supply device according to the ninth embodiment of the present invention, the protrusion height (H) of the connecting convex portion protruding from the main surface of the end plate is 5 mm or less.

According to the above configuration, since the height of the connecting convex portion protruding to the outside of the end plate is as low as 5 mm or less, the overall external shape can be reduced and the installation can be carried out in a space-saving manner. Furthermore, by reducing the height of the connecting convex portion, the through hole of the fixing piece can be smoothly guided and assembly can be facilitated.

In the power supply device according to the tenth embodiment of the present invention, the fixed piece is a bent piece of a plate-like bar.

Embodiments of the present invention will be described below based on the drawings. However, the embodiment shown below is an illustration for embodying the technical idea of the present invention, and the present invention is not limited to the following. Moreover, this specification does not in any way specify the members shown in the claims to the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the constituent members described in the embodiments are not intended to limit the scope of the present invention, unless specifically stated, and are merely illustrative examples. It's nothing more than that. Note that the sizes, positional relationships, etc. of members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same names and symbols indicate the same or homogeneous members, and detailed descriptions will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured so that a plurality of elements are made of the same member so that one member serves as a plurality of elements, or conversely, the function of one member may be performed by a plurality of members. It can also be accomplished by sharing. Moreover, some of the contents described in some examples and embodiments can be used in other examples and embodiments.

The power supply device according to the embodiment is a power supply that is installed in an electric vehicle such as a hybrid vehicle or an electric vehicle and supplies power to a driving motor, a power supply that stores power generated by natural energy such as solar power generation or wind power generation, or It is used for various purposes, such as a power source for storing late-night power, and is particularly suitable for use in high-power and high-current applications. In the following example, an embodiment applied to a power supply device for driving an electric vehicle will be described.

(Embodiment 1)
FIG. 1 is a perspective view of a power supply device 100 according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a horizontal cross-sectional view of the power supply device 100 in FIG. Figure 4 shows enlarged views of the main parts. A power supply device 100 shown in these figures includes a battery stack 10 in which a plurality of battery cells 1 are stacked, a pair of end plates 3 disposed on both end faces of the battery stack 10 in the stacking direction, and a battery stack 10. A plurality of bind bars are provided on opposing sides of the stacked body 10 to fasten the end plates 3 together.

(Battery cell 1)
The battery cell 1 is a prismatic battery whose main surface, which is a wide surface, has a rectangular outer shape, and is thinner than its width. Furthermore, the battery cell 1 is a rechargeable and dischargeable secondary battery, and is a lithium ion secondary battery. However, the present invention does not specify the battery cell to be a prismatic battery, nor does it specify a lithium ion secondary battery. All rechargeable batteries can be used as the battery cells, such as nonaqueous electrolyte secondary batteries other than lithium ion secondary batteries, nickel-hydrogen battery cells, and the like.

As shown in FIG. 2, in the battery cell 1, an electrode body in which positive and negative electrode plates are laminated is housed in an exterior can 1a, which is filled with an electrolytic solution and hermetically sealed. The outer can 1a is formed into a rectangular cylindrical shape with a closed bottom, and the upper opening is hermetically closed with a sealing plate 1b made of a metal plate. The outer can 1a is manufactured by deep drawing a metal plate made of aluminum, aluminum alloy, or the like. The sealing plate 1b is made of a metal plate such as aluminum or aluminum alloy, like the outer can 1a. The sealing plate 1b is inserted into the opening of the outer can 1a, and the boundary between the outer circumference of the sealing plate 1b and the inner circumference of the outer can 1a is irradiated with laser light to laser weld the sealing plate 1b to the outer can 1a. It is fixed airtight. A sealing plate 1b fixed to the outer can 1a has positive and negative electrode terminals 13 fixed to both ends thereof.

The electrode terminal 13 has a cylindrical protrusion. However, the protrusion does not necessarily have to be cylindrical, and can also be polygonal or elliptical. The positions of the positive and negative electrode terminals 13 fixed to the sealing plate 1b of the battery cell 1 are such that the positive and negative electrodes are symmetrical. As a result, adjacent battery cells 1 can be connected in series by stacking the battery cells 1 with their sides reversed and connecting the adjacent positive and negative electrode terminals 13 with a bus bar (not shown). That's what I do.

(Battery laminate 10)
The plurality of battery cells 1 are stacked so that the thickness direction of each battery cell 1 is in the stacking direction to constitute the battery stack 10. In the battery stack 10, a plurality of battery cells 1 are stacked so that the terminal surfaces on which the positive and negative electrode terminals 13 are provided, that is, the sealing plate 1b in FIG. 2, are on the same plane. A plurality of battery cells 1 stacked on each other are connected in series and/or in parallel with each other by connecting positive and negative electrode terminals 13. The power supply device 100 connects the positive and negative electrode terminals 13 of adjacent battery cells 1 to each other in series and/or in parallel via a bus bar (not shown). A power supply device that connects adjacent battery cells in series can increase the output voltage by increasing the output, and can increase the charging/discharging current by connecting adjacent battery cells in parallel.

In the battery stack 10 shown in FIG. 2, a plurality of battery cells 1 are stacked on each other with spacers 12 interposed therebetween, and these battery cells 1 are connected in series. In the illustrated battery stack 10, adjacent battery cells 1 are arranged in opposite directions, and adjacent electrode terminals 13 are connected on both sides with bus bars to connect two adjacent battery cells 1 in series. All the 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.

In the battery stack 10, as shown in FIGS. 2 and 3, spacers 12 are sandwiched between stacked battery cells 1. Spacer 12 insulates adjacent battery cells 1 . The spacer 12 shown in the figure is an insulating plate made of plastic molded into a plate shape. In particular, the spacer 12 molded from plastic, which is a material with low thermal conductivity, has the effect of effectively preventing thermal runaway of adjacent battery cells 1. This spacer 12 has a shape in which the battery cells 1 are fitted and arranged in a fixed position, so that adjacent battery cells 1 can be stacked without shifting their positions.

As described above, in the battery cells 1 stacked while being insulated by the spacers 12, the outer can can be made of metal such as aluminum. However, the battery stack does not necessarily require spacers to be interposed between the battery cells. For example, spacers can be created by insulating adjacent battery cells from each other by molding the outer can of the battery cell with an insulating material or by coating the outer periphery of the outer can of the battery cell with an insulating sheet or insulating paint. This is because it can be made unnecessary. Furthermore, battery stacks that do not require spacers between battery cells are directly cooled using a refrigerant, etc., instead of using an air-cooling method that cools the battery cells by forcing cooling air between the battery cells. can be used to cool battery cells.

(End plate 3)
As shown in FIGS. 1 to 3, the end plates 3 are arranged at both ends of the battery stack 10 and fastened via a pair of left and right bind bars 4 arranged along both side surfaces of the battery stack 10. be done. The end plate 3 is a rectangular plate whose outer shape is approximately equal to or slightly larger than the outer shape of the battery cell 1, and bind bars 4 are fixed to the outer peripheral surfaces on both sides to suppress expansion of the battery stack 10. be. The end plate 3 is entirely made of metal such as aluminum, aluminum alloy, SUS, or iron. However, although not shown, the end plate may have a structure in which a metal plate is laminated on plastic, or it may be a fiber-reinforced resin molded plate in which reinforcing fibers are embedded throughout.

The end plate 3 is in close contact with the surface of the battery cell 1 either directly or via the spacer 12, and fixes the battery cell 1 in a pressurized state with uniform pressure. In the assembly process, the power supply device 100 arranges end plates 3 at both ends of the battery stack 10, presses the end plates 3 at both ends with a press machine (not shown), and presses the battery cells 1 in the stacking direction. The bind bar 4 is fixed to the end plate 3 in this state, and the battery stack 10 is held and fixed at a predetermined tightening pressure. After the end plate 3 is fixed to the bind bar 4, the pressurized state of the press is released.

The end plate 3 is fixed to the bind bar 4, receives the swelling force P of the battery stack 10, and holds the battery cell 1. As shown in the enlarged sectional view of FIG. 4, the end plate 3 guides the locking block 5 provided on the bind bar 4 in order to reliably connect the locking block 5 provided on the bind bar 4 to be fixed. Fitting portions 3a are provided on the outer peripheral surfaces of both sides. Furthermore, the end plate 3 is provided with a stopper part 3b that comes into contact with the locking block 5 on the battery stack 10 side of the fitting part 3a. In other words, on both side surfaces of the end plate 3, stopper portions 3b protruding from the end on the battery stack 10 side toward the bind bar 4 are provided, and a step-shaped fitting portion 3a is provided.

The end plate 3 receives from the battery stack 10 an expansion force P that is generated by the expansion of the battery cell 1 and tends to spread in the battery stack direction. At this time, the locking block 5 of the bind bar 4 connected to the end plate 3 receives a pressing force R that presses it outward in the battery stacking direction at the contact portion with the stopper portion 3b. As a result, a strong tensile force F acts on the bind bar 4 as a reaction to the pressing force R acting on the locking block 5. The end plate 3 suppresses the movement of the locking block 5 due to the tensile force F of the bind bar 4 due to the contact between the stopper portion 3b and the locking block 5, and resists the expansion force P of the battery cell 1. , held in a fastened state. The stopper portion 3b has a width that does not deform due to the tensile force F of the bind bar 4 acting on the contact portion with the locking block 5. The width (d) of the stopper portion 3b is set to an optimum value in consideration of the tensile force F of the bind bar 4. For example, if the entire end plate 3 is made of aluminum, the width (d) is 3 mm or more, preferably 4 mm or more, and more preferably should be 5 mm or more, optimally 8 mm or more. The maximum shearing force that a material can withstand is considerably stronger than the maximum bending force, and by setting the width (d) of the stopper portion 3b within the above range, the tensile force F of the bind bar 4 can be reduced by the shearing stress of the stopper portion 3b. The stopper portion 3b is supported to prevent deformation of the stopper portion 3b.

Furthermore, the end plate 3 shown in FIG. 4 has a gap 18 inside the corner between the fitting part 3a and the stopper part 3b. In the end plate 3 in which the gap 18 is provided, the width (d) of the stopper portion 3b is made sufficiently larger than the width (s) of the gap 18, for example, more than six times. The stopper portion 3b, whose width (d) is sufficiently wider than the width (s) of the gap 18, supports the tensile force F of the bind bar 4 by shearing stress instead of bending stress. The maximum shearing force that the material can withstand is considerably stronger than the maximum bending force, and the width (d) of the stopper portion 3b is made larger than the width (s) of the gap 18 to reliably prevent deformation of the stopper portion 3b. can. Therefore, in the end plate 3 in which the gap 18 is provided inside the corner between the fitting part 3a and the stopper part 3b, the horizontal width (d) of the stopper part 3b is made larger than six times the width (s) of the gap 18. , the tensile force of the bind bar 4 can be supported by the shear stress of the stopper portion 3b.

Furthermore, the height (h) of the stopper part 3b is preferably made larger than the thickness (t) of the locking block 5, so that a gap is created between the distal end surface of the stopper part 3b and the inner surface of the bind bar 4. It is preferable to make it small. However, the height (h) of the stopper portion 3b may be made smaller than the thickness (t) of the locking block to provide a gap between the tip end surface of the stopper portion 3b and the inner surface of the bind bar 4. good. Therefore, the height (h) of the stopper part 3b is determined by the thickness (t) of the locking block 5, the gap between the tip end surface of the stopper part 3b and the inner surface of the bind bar 4, and the height (h) of the engaging block 5. It is specified in consideration of the width (s) of the gap 18 formed inside the corner between the stopper portion 3a and the stopper portion 3b. The height (h) of the stopper portion 3b can be, for example, from (t-1) to (t+1) mm with respect to the thickness (t [mm]) of the locking block 5.

(Bind bar 4)
The bind bar 4 includes a plate bar 6 extending in the stacking direction of the battery stack 10 and a locking block 5 fixed to the plate bar 6 and protruding from a surface facing the outer peripheral surface of the end plate 3. A fixing piece 7 fixed to the end plate 3 is provided at both ends. The plate bar 6 is arranged on the surface facing the battery stack 10, the locking block 5 is guided to the fitting part 3a of the end plate 3, and the fixing piece 7 is fixed to the outer main surface 3A of the end plate 3. Ru.

(Plate bar 6)
The plate bar 6 is made of a metal plate that can withstand strong tensile force, such as a metal plate made of high-tensile steel with a tensile strength of 400 MPa or more. The plate-shaped bar 6 made of high tensile strength steel can have a thickness of 1 mm to 2 mm, for example, to achieve strength that can withstand the tensile force F acting on the bind bar 4. In the bind bar 4 of FIG. 2, the plate bar 6 disposed on one side of the battery stack 10 is a metal plate having a vertical width that covers the side surface of the battery stack 10. The plate bar 6 made of a metal plate is bent into a predetermined shape by press molding or the like. The plate-shaped bar 6 shown in the figure has upper and lower end edges bent to form a bent piece 4a. The upper and lower bent pieces 4a are shaped to cover the upper and lower surfaces of the battery stack 10 from the corners on both left and right sides of the battery stack 10. In the illustrated power supply device 100, a plate-shaped bar 6 made of a single metal plate is arranged on one side of a battery stack 10. However, although not shown, in the power supply device, a plate-like bar made of two metal plates divided into upper and lower parts can also be arranged on one side of the battery stack.

(locking block 5)
The bind bar 4 shown in FIGS. 1 to 3 has locking blocks 5 fixed to both ends of a plate-like bar 6. This bind bar 4 has a locking block 5 fixed to the inner surface of both longitudinal ends of the plate bar 6 in a region facing a fitting portion 3a provided on the side surface of the end plate 3. The locking block 5 shown in the figure is formed in a plate shape or a prismatic shape extending along the side surface of the end plate 3, and is fixed in a posture protruding toward a fitting portion 3a provided on the end plate 3. . A pair of locking blocks 5 fixed to both ends of the plate-shaped bar 6 have a size and shape such that they are guided by a fitting portion 3a provided on the side surface of the end plate 3 and are locked to a stopper portion 3b. When the bind bar 4 is connected to the end plate 3, the locking block 5 is guided by the fitting part 3a and locked by the stopper part 3b, and holds the bind bar 4 in a fixed position on both sides of the battery stack 10. Deploy. The bind bar 4 guides the locking block 5 to the fitting part 3a of the end plate 3 and locks it to the stopper part 3b, thereby increasing resistance to shear stress.

The locking block 5 is made of metal, preferably iron or an iron alloy. The metal locking block 5 is fixed to the inside of the plate bar 6 by welding. This bind bar 4 can be mass-produced at low cost. The locking block 5 can be fixed to the plate bar by spot welding, for example. In this structure in which the locking block 5 is spot-welded to the plate-shaped bar 6, the locking block 5 and the plate-shaped bar 6 can be welded at the boundary surface, so that the boundary edge can be in a state where there is no step. A feature is that the locking block 5 guided by the fitting part 3a can be placed in close contact with the stopper part 3b. However, the locking block can also be fixed to the plate-shaped bar via a connector such as a rivet, or can be fixed to the plate-shaped bar using a combination of a connector and a welded structure.

The horizontal width (w) of the locking block 5 in the battery stacking direction is set to a width that does not deform due to the tensile force F acting on the plate-shaped bar 6, for example, 6 mm or more, preferably 10 mm or more. FIG. 4 is an enlarged cross-sectional view of the portion where the bind bar 4 is connected to the end plate 5, and shows a state in which there is no gap inside the corner of the locking block 5, in other words, on the stopper portion 3b side of the locking block 5. The entire opposing surface is in close contact with the stopper portion 3b, and the tip end surface of the stopper portion 3b is in close contact with the inner surface of the plate-shaped bar 6. As described above, in the positional relationship between the bind bar 4 and the end plate 3, it is preferable that there is no gap inside the corner of the locking block 5, and that the end surface of the stopper portion 3b is in close contact with the inner surface of the plate bar 6. . However, there may be some gap between the end surface of the stopper portion 3b and the inner surface of the plate-shaped bar 6. In this case, the lateral width (w) of the locking block 5 is made sufficiently large, for example, more than 6 times the interval of this gap, so that the tensile force F of the bind bar 4 can be supported as a shear stress.

Further, the thickness (t) of the locking block 5 is such that the opposing surface on the side of the stopper portion 3b can be reliably brought into contact with and supported by the stopper portion 3b. For example, as shown in FIG. 4, in a configuration in which there is no gap inside the corner of the locking block 5 and the end surface of the stopper portion 3b is in close contact with the inner surface of the plate-shaped bar 6, the thickness of the locking block 5 ( By setting t) to 3 mm or more, the opposing surface can be reliably brought into contact with and pressed against the stopper portion 3b. However, as mentioned above, there may be some gap between the end surface of the stopper part 3b and the inner surface of the plate-shaped bar 6, and in this case, the locking block By making the thickness (t) of the binder bar 5 sufficiently large, for example, greater than 6 times, the tensile force F of the bind bar 4 can be supported by the locking block 5 as a shear stress. As described above, the thickness (t) of the locking block 5 is designed to be optimal depending on the positional relationship with the stopper portion 3b.

(Fixed piece 7)
As shown in FIGS. 1 to 4, the fixing pieces 7 are provided at both ends of the bind bar 4 and are fixed to the outer main surface 3A of the end plate 3. In the illustrated bind bar 4, both ends of a plate-shaped bar 6 are bent inward at 90 degrees to provide a bent piece 6a, and this bent piece 6a is used as a fixing piece 7. The fixing piece 7 fixes the end of the bind bar 4 to the main surface 3A of the end plate 3, but the fixing piece 7 is not required to have high strength. This is because the large tensile force F acting on the bind bar 4 is supported by the locking block 5 and the stopper portion 3b and does not act on the fixing piece 7. Therefore, the fixing piece 7 does not need to have the strength to withstand the large tensile force F or the large bending stress caused by this tensile force F, and prevents the locking block 5 of the bind bar 4 from separating from the fitting part 3a. It is fixed to the end plate 3 with the possible connection strength.

As described above, the fixing piece 7, which does not require strong connection strength to the end plate 3, can be shaped so that its substantial width narrows toward the tip, although not shown, to reduce the weight of the bind bar 4. .

The fixing piece 7 is fixed to the end plate 3 without using a fixing device such as a bolt, as in the conventional case. According to the structure in which the fixing piece is fixed to the end plate with bolts, as shown in Figure 14, the tightening torque of the bolt rotates the fixing piece and tilts the bind bar, causing the bind bar and the battery stack to become distorted or twisted. There was a risk that the Further, when fixing with bolts, there is no possibility that the bolts may loosen over time due to external factors such as vibration. Therefore, in the power supply device of the present invention, in order to solve these problems, the fixing piece 7 is fixed to the end plate 3 using a unique connection structure. The power supply device 100 shown in FIGS. 2 to 4 includes a plurality of connecting protrusions 8 on the main surface 3A of the end plate 3 in order to fix the fixing piece 7 on the outer main surface 3A of the end plate 3, and The piece 7 is provided with a through hole 7a through which the connecting protrusion 8 is guided through, and is further provided with a locking tool 9 fixed to the tip of the connecting protrusion 8 passing through the fixed piece 7. There is.

The fixing piece 7 is fixed to the end plate 3 via a connecting protrusion 8 passing through it. The fixing piece 7 has a through hole 7a at its tip, through which the connecting protrusion 8 is inserted. In the fixing piece 7, the connecting protrusion 8 is inserted into the through hole 7a, and a locking tool 9 is fixed to the tip of the connecting protrusion 8 passing through the through hole 7a. The fixing piece 7 is arranged on the main surface 3A of the end plate 3 with the connecting protrusion 8 inserted into the through hole 7a, and the locking tool 9 is fixed to the tip of the connecting protrusion 8 that passes through the fixing piece 7. By doing so, it is held so that it does not come off from the connecting convex portion 8. This fixed structure power supply device guides the locking block 5 to the fitting part 3a of the end plate 3, supports the tensile force of the bind bar 4 with the stopper part 3b, and also By fixing the piece 7 to the end plate 3, the pair of end plates 3 can be stably held in a fixed position by the bind bar 4.

(Connection protrusion 8)
The connecting convex portion 8 is a columnar convex portion provided on the outer main surface 3A of the end plate 3. The end plate 3 shown in the figure is provided with a plurality of connecting protrusions 8 protruding from the main surface 3A at a position facing the fixing piece 7. The end plate 3 shown in the figure has two connecting convex portions 8 on the left and right sides of the main surface, spaced apart from each other in the vertical direction. However, the number and arrangement of the connecting protrusions 8 provided on the end plate 3 can be variously changed.

The connecting convex portion 8 shown in FIG. 4 has a cylindrical shape and is formed to protrude perpendicularly to the main surface 3A. The connecting convex portion 8 having a circular cross-sectional shape is characterized in that it can be inserted through the through hole 7a provided in the fixing piece 7 regardless of the orientation thereof. However, the connecting convex portion can also have an elliptical or polygonal cross-sectional shape. When the connecting convex portion having a non-circular cross-sectional shape is inserted into the through hole of the fixed piece, the connecting convex portion is connected while specifying the direction of the fixed piece.

The connecting convex portion 8 shown in FIG. 4 is integrally molded on the end plate 3. The connecting convex portion 8 is integrally formed when the end plate 3 is cast from metal. With this structure, the connecting convex portion 8 of a predetermined height (H) can be formed at an accurate position with respect to the main surface 3A of the end plate 3.

However, the connecting convex portion 8 can also be formed as a separate member from the end plate 3, as shown in FIG. The power supply device shown in FIG. 5 has a connecting convex portion 8 protruding from the main surface 3A by press-fitting a fixing pin 15 into a fixing hole 3c provided in an end plate 3 and fixing it so that it does not come out. This structure has the advantage of simplifying the processing of the end plate 3 and reducing manufacturing costs. The fixing pin 15 shown in the figure has a structure in which it is press-fitted into the fixing hole 3c and cannot be removed, but the fixing pin can also be fixed by being screwed into a fixing hole having a male thread at its tip and a female thread.

If the protrusion height (H) of the above-mentioned connecting convex portion 8 is increased, it becomes difficult for the fixing piece 7 to come off, but it becomes difficult to insert into the through hole 7a of the fixing piece 7, and the external shape of the power supply device increases. On the other hand, by reducing the protrusion height (H) of the connecting convex portion 8, it can be easily inserted into the through hole 7a of the fixing piece 7, and the external shape of the power supply device can be reduced. From the above, it is preferable that the amount of protrusion of the connecting convex portion 8 is made as small as possible within a range that allows the fixing piece 7 to be held without coming off while the locking tool 9 is being fixed to the distal end. That is, the connecting convex portion 8 is formed to have an optimum protrusion height (H) in consideration of the connecting state with the fixed piece 7. The connecting convex portion 8 has a protrusion height (H) of 5 mm or less, preferably 3 mm or less, relative to the main surface 3A of the end plate 3.

Further, the connecting convex portion 8 shown in FIGS. 4 and 6 is provided with an outer circumferential groove 8a for guiding the locking tool 9 on the outer circumferential surface of the tip. The outer circumferential groove 8a is formed by cutting the outer circumferential surface of the columnar convex portion. The outer circumferential groove 8a guides the inner part of the ring-shaped locking tool 9 to prevent the locking tool 9 from moving in the axial direction and coming off the connecting protrusion 8, thereby preventing the fixing piece from connecting. This prevents it from coming off the protrusion 8. The depth of the outer circumferential groove 8a is such that it can guide and hold the locking portion provided on the locking tool 9 so that it does not come off, and is formed to be 0.4 to 1 mm. Further, the outer diameter (D) of the connecting convex portion 8 is large enough to form the above-mentioned outer circumferential groove 8a, and can be set to 3 mm to 5 mm so that the locking tool 9 can be connected reliably.

(Through hole 7a)
The fixing piece 7 of the bind bar 4 is provided with a through hole 7 a for guiding the connecting protrusion 8 at a position facing the connecting protrusion 8 provided on the end plate 3 . That is, the fixing piece 7 shown in FIG. 2 is provided with two through holes 7a spaced apart vertically so as to guide the two upper and lower connecting protrusions 8 provided on one side of the end plate 3. . The through hole 7a has an inner shape that is almost the same as the outer shape of the connecting protrusion 8, and by guiding the connecting protrusion 8 into the through hole 7a, the fixing piece 7 can be positioned and placed with respect to the end plate 3. I'm trying to make it possible. Since the connecting convex portion 8 shown in the figure has a cylindrical shape, the through hole 7a has a circular inner shape. Since the connecting protrusion 8 can have a shape other than a columnar shape, the through hole 7a that guides the connecting protrusion 8 can have a shape and size that allows the connecting protrusion 8 to be inserted therethrough.

(locking tool 9)
The locking tool 9 is connected to the tip of the connecting protrusion 8 that protrudes through the fixing piece 7, and holds the fixing piece 7 so that it does not come off the connecting protrusion 8. As such a locking tool 9, a retaining ring or a retaining pin can be used. The retaining ring is formed by processing an elastic metal plate or metal rod into an annular shape, and has a structure that allows it to be connected to the connecting convex portion 8 by elastically deforming the ring in its entirety or in part. As such a retaining ring, for example, a ring material formed in an annular shape with a partially open opening, or a nut material having a plurality of locking pieces inside the annular ring portion can be used.

The locking tool 9 shown in FIG. 6 is a ring material generally called a snap ring 9A, and is manufactured by cutting a metal plate made of elastic metal into a predetermined shape. The illustrated snap ring 9A has an opening 22 in a part of the ring portion 21 which has an annular overall shape, and jig connecting portions 23 provided at both ends of the ring portion 21 are arranged on both sides of the opening 22. are doing. This locking tool expands the ring portion 21 with the tip of the jig inserted into the jig connecting portion 23, guides the connecting convex portion 8 inside the expanded ring portion 21, and expands the ring portion 21. The inner circumferential portion is used as a locking portion to fit into the outer circumferential groove 8a and to be connected to the connecting convex portion 8.

The locking tool 9 shown in FIG. 7 is a ring material generally called an E-ring 9B, and is manufactured by cutting a metal plate made of elastic metal into a predetermined shape. The E-ring 9B shown in the figure has a plurality of protrusions 24 on the inside of an arcuate ring portion 21 formed by cutting out a portion of a circle and providing an opening 22 therein, thereby forming a locking portion. The illustrated E-ring 9B is provided with protrusions 24 on both sides of the opening 22, and these protrusions 24 are guided into the outer circumferential groove 8a and fixed to the connecting protrusion 8. The locking tool 9, which is an E-ring 9B, has the protruding parts 24 on both sides of the opening 22, with the opening 22 of the ring part 21 facing the outer circumferential groove 8a of the connecting convex part 8, as shown by the arrow in the figure. It is press-fitted into the outer circumferential groove 8a and connected so as not to come off.

The locking tool 9 shown in FIG. 8 is a nut material generally called a speed nut 9C, and is manufactured by cutting a metal plate made of elastic metal into a predetermined shape. The illustrated speed nut 9C is provided with a plurality of locking pieces 25 that protrude inward from the inner circumferential surface of a ring portion 21 that has an annular overall shape. In this speed nut 9C, the inner shape of the ring portion 21 is made larger than the outer diameter of the connecting convex portion 8, and the plurality of locking pieces 25 are elastically deformed so that their tips are guided to the outer circumferential groove 8a. It is press-fitted into the center hole 26 while guiding the connecting protrusion 8 and is connected to the connecting protrusion 8 .

The above-mentioned locking tool 9 is fitted into the outer peripheral groove 8a using the whole or part of the inner part of the annularly formed ring part 21 as a locking part, and also connects the outer peripheral part or the whole of the ring part 21 to the connecting convex part 8a. The fixing piece 7 is held so as not to come off by protruding outward from the outer peripheral surface of the fixing piece 7. In this way, the locking tool 9, which is a ring material or a nut material, can cover a wide area around the through hole 7a of the fixed piece 7 and can hold the fixed piece 7 so that it does not come off.

Furthermore, FIG. 9 shows a locking tool 9 that is a retaining pin. The locking tool 9 shown in the figure is a pin material generally called a snap pin 9D, and is formed by bending or curving a metal rod or metal plate made of an elastic metal into a predetermined shape. The illustrated snap pin 9D includes an insertion portion 27 that passes through the connecting convex portion 8 and is inserted in a direction intersecting the axis, and a U-curved portion 28 formed by making a U-curve at the rear end of the insertion portion 27. The connecting convex portion 8 includes an elastic deformation portion 29 disposed opposite to the outer circumferential surface or the outer circumferential groove of the connecting convex portion 8 . As shown in FIG. 9, this snap pin 9D has an insertion portion inserted into a projection through hole 8b provided in the connection projection 8, and while elastically deforming the elastic deformation portion 29, the connection projection becomes the insertion portion. It is inserted between the elastic deformation parts and connected to the connection convex part. The elastically deformable portion 29 shown in the figure has an intermediate portion curved in a shape that follows the outer circumferential surface of the connecting convex portion 8 . This locking tool 9 holds the fixing piece 7 so that the tip of the insertion portion 27 and the U-shaped portion 28 protrude outward from the outer peripheral surface of the connecting convex portion 8 so as not to come off.

The connecting protrusion shown in FIG. 9 is provided with a protrusion through hole 8b so that the insertion portion 27 of the snap pin 9D can be passed through. The convex portion through hole 8b is provided to extend in a direction intersecting the central axis of the connecting convex portion 8. The convex through hole 8b shown in the figure is opened so as to pass through the opposing bottom surface of the outer circumferential groove 8a provided on the outer circumferential surface of the connecting convex portion 8. In this way, the connecting protrusion 8 having the protrusion through hole 8b in the outer circumferential groove 8a, as shown in FIG. The snap pin 9D can be placed in a fixed position by guiding it. However, the connecting protrusion provided with the protrusion through-hole does not necessarily need to be provided with an outer circumferential groove. This is because the insertion portion penetrating the protrusion coupling portion can prevent the locking tool from moving in the axial direction of the coupling protrusion.

The above power supply device 100 is assembled through the following steps.
(1) A predetermined number of battery cells 1 are stacked in the thickness direction of the battery cells 1 with spacers 12 interposed therebetween to form a battery stack 10.
(2) Arrange the end plates 3 at both ends of the battery stack 10, press the pair of end plates 3 from both sides with a press machine (not shown), and use the end plates 3 to press the battery stack 10 into a predetermined shape. Pressure is applied to compress the battery cell 1 and maintain it in a pressurized state.
(3) While the battery stack 10 is pressurized by the end plates 3, the bind bar 4 is connected and fixed to the pair of end plates 3. The bind bar 4 is arranged such that the locking blocks 5 at both ends are guided by the fitting parts 3a of the pair of end plates 3, and the main surface of the end plates 3 is inserted into the through holes 7a of the fixing pieces 7 at both ends. Insert the connecting protrusion 7 protruding from 3A. A locking tool 9 is fixed to the tip of a connecting convex portion 8 passing through the fixed piece 7, and the fixed piece 7 is fixed to the outer main surface 3A of the end plate 3. After the end plate 3 is fixed to the bind bar 4, the pressurized state of the press is released.
In this state, the battery stack 10 is held at a predetermined tightening pressure via a pair of end plates 3 that are held at a predetermined interval by a bind bar 4.
(4) On both sides of the battery stack 10, the opposing electrode terminals 13 of adjacent battery cells 1 are connected to each other by bus bars (not shown). The bus bar is fixed to the electrode terminal 13 to connect the battery cells 1 in series or in series and parallel. The bus bar is fixed to the electrode terminal 13 by welding or screwing.

The above power supply device can be used as a vehicle power supply that supplies power to a motor that drives an electric vehicle. Electric vehicles equipped with a power supply device include hybrid cars and plug-in hybrid cars that run on both an engine and a motor, and electric cars that run only on a motor. Ru. In addition, in order to obtain electric power to drive the vehicle, it is also possible to connect a large number of the above-mentioned power supply devices in series or parallel, and to construct and install a large-capacity, high-output power supply device with the necessary control circuits added. can.

(Hybrid vehicle power supply device)
FIG. 10 shows an example in which a power supply device is installed in a hybrid vehicle that runs using both an engine and a motor. A vehicle HV equipped with the power supply device shown in this figure includes a vehicle main body 91, an engine 96 and a motor 93 for driving the vehicle main body 91, and wheels driven by the engine 96 and the motor 93 for driving. 97, a power supply device 100 that supplies power to the motor 93, and a generator 94 that charges the battery of the power supply device 100. Power supply device 100 is connected to motor 93 and generator 94 via DC/AC inverter 95 . The vehicle HV runs using both the motor 93 and the engine 96 while charging and discharging the battery of the power supply device 100. The motor 93 is driven to drive the vehicle when the engine is inefficient, such as when accelerating or running at low speeds. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by the engine 96 or by regenerative braking when braking the vehicle, and charges the battery of the power supply device 100. Note that the vehicle HV may include a charging plug 98 for charging the power supply device 100, as shown in the figure. By connecting this charging plug 98 to an external power source, the power supply device 100 can be charged.

(Electric vehicle power supply device)
Further, FIG. 11 shows an example in which a power supply device is mounted on an electric vehicle that runs only by a motor. The vehicle EV equipped with the power supply device shown in this figure includes a vehicle body 91, a motor 93 for driving the vehicle body 91, wheels 97 driven by the motor 93, and supplies power to the motor 93. The power supply device 100 includes a power supply device 100 and a generator 94 that charges the battery of the power supply device 100. Power supply device 100 is connected to motor 93 and generator 94 via DC/AC inverter 95 . The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by the energy generated when regeneratively braking the vehicle EV, and charges the battery of the power supply device 100. The vehicle EV is also equipped with a charging plug 98, and the power supply device 100 can be charged by connecting the charging plug 98 to an external power source.

(Power supply device for power storage device)
Furthermore, the present invention does not specify the use of the power supply device as a power source for a motor that drives a vehicle. The power supply device according to the embodiment can also be used as a power source for a power storage device that stores power by charging a battery with power generated by solar power generation, wind power generation, or the like. FIG. 12 shows a power storage device that stores power by charging the battery of the power supply device 100 with the solar cell 82.

The power storage device shown in FIG. 12 charges the battery of the power supply device 100 with electric power generated by a solar cell 82 placed on the roof or roof of a building 81 such as a house or a factory. This power storage device uses a solar cell 82 as a charging power source to charge a battery of a power supply device 100 in a charging circuit 83, and then supplies power to a load 86 via a DC/AC inverter 85. Therefore, this power storage device has a charging mode and a discharging mode. The power storage device shown in the figure has a DC/AC inverter 85 and a charging circuit 83 connected to a power supply device 100 via a discharge switch 87 and a charging switch 84, respectively. The discharge switch 87 and the charge switch 84 are turned ON/OFF by a power supply controller 88 of the power storage device. In the charging mode, the power supply controller 88 turns on the charging switch 84 and turns off the discharging switch 87 to permit charging from the charging circuit 83 to the power supply device 100. Further, when charging is completed and becomes fully charged, or when the capacity is charged to a predetermined value or more, the power supply controller 88 turns off the charging switch 84 and turns on the discharging switch 87 to switch to the discharging mode, and the power supply device 100 Allows discharge from the load 86 to the load 86. Furthermore, if necessary, the charging switch 84 and the discharging switch 87 can be turned on to supply power to the load 86 and charge the power supply device 100 at the same time.

Furthermore, although not shown, the power supply device can also be used as a power source for a power storage device that charges a battery and stores power using late night power. A power supply device that is charged with late-night power can be charged with late-night power that is surplus power from a power plant, output power during the day when the power load is heavy, and limit peak power during the day to a small value. Furthermore, the power supply device can be used as a power source for charging both with the output of the solar cell and with late-night electricity. This power supply device effectively utilizes both the power generated by solar cells and late-night power, and can efficiently store power while taking weather and power consumption into consideration.

The above power storage devices include backup power supplies that can be mounted on computer server racks, backup power supplies for wireless base stations such as mobile phones, power storage power supplies for home or factory use, power supplies for street lights, etc. It can be suitably used for applications such as power storage devices combined with solar cells, and backup power sources for traffic lights and road traffic indicators.

The power supply device according to the present invention, the electric vehicle equipped with the power supply device, and the power storage device can be used as a power supply device for plug-in hybrid electric vehicles, hybrid electric vehicles, electric vehicles, etc. that can switch between EV driving mode and HEV driving mode. It can be used suitably. In addition, power storage devices combined with solar cells, such as backup power supplies that can be mounted on computer server racks, backup power supplies for wireless base stations such as mobile phones, power storage power supplies for homes and factories, and power sources for street lights. It can also be used as a backup power source for traffic lights and the like.

100... Power supply device 1... Battery cell 1a... Exterior can 1b... Sealing plate 3... End plate 3A... Main surface 3a... Fitting part 3b... Stopper part 3c... Fixing hole 4... Bind bar 5... Locking block 6... Plate shape Bar 6a...Bending piece 7...Fixing piece 7a...Through hole 8...Connecting protrusion 8a...Outer circumferential groove 8b...Protrusion side through hole 9...Locking tool 9A...Snap ring 9B...E ring 9C...Speed nut 9D...Snap pin 10...Battery stack 12...Spacer 13...Electrode terminal 15...Fixing pin 18...Gap 21...Ring part 22...Opening 23...Jig connection part 24...Protrusion part 25...Locking piece 26...Center hole 27...Insertion part 28... U-bending portion 29...Elastic deformation part 81...Building 82...Solar cell 83...Charging circuit 84...Charging switch 85...DC/AC inverter 86...Load 87...Discharge switch 88...Power controller 91...Vehicle body 93...Motor 94...Power generation Machine 95...DC/AC inverter 96...Engine 97...Wheel 98...Charging plug HV, EV...Vehicle 803...End plate 803A...Main surface 803a...Recess 807...Fixing piece 809...Rivet 809a...Cylinder part 809b...Center rod 809c... Flange portion 809d... Forming flange portion 900... Power supply device 901... Battery cell 902... Spacer 903... End plate 903A... Main surface 904... Bind bar 907... Fixing piece 908... Bolt 910... Battery stack

Claims (12)

A battery laminate formed by stacking a plurality of battery cells,
a pair of end plates arranged on both end faces of the battery stack in the stacking direction;
A power supply device comprising a plurality of bind bars that are respectively arranged on opposing sides of the battery stack and fasten the end plates to each other,
The bind bar is
a plate-shaped bar extending in the stacking direction of the battery stack;
a locking block fixed to both longitudinal ends of the plate-shaped bar and protruding toward the end plate;
It has fixing pieces at both ends that are fixed to the outer main surfaces opposite to the opposing surfaces of the pair of end plates,
The end plate is
The locking block has fitting portions on both sides to guide the locking block, and a stopper portion of the locking block is provided on the battery stack side of the fitting portion, and further,
A plurality of connecting convex portions protruding from the main surface are provided on the outer main surface at a position facing the fixing piece,
The fixing piece has a through hole that penetrates the connecting convex portion, and further includes:
comprising a locking tool fixed to the connecting protrusion passing through the fixing piece,
With the locking block guided to the fitting portion and the connecting protrusion inserted into the through hole of the fixing piece, the locking tool is connected to the connecting protrusion and the bind bar is connected to the connecting protrusion. A power supply device fixed to the end plate. The power supply device according to claim 1,
A power supply device characterized in that the connecting convex portion is integrally molded with the end plate. The power supply device according to claim 1,
A power supply device characterized in that the connecting convex portion is constituted by a fixing pin fixed to the end plate. A power supply device according to any one of claims 1 to 3,
A power supply device in which the connecting convex portion is formed in a cylindrical shape, and an outer peripheral groove for guiding the locking tool is formed on the outer peripheral surface of the cylindrical shape. A power supply device according to any one of claims 1 to 4,
The locking tool is formed in an annular shape with a portion opened,
The power supply device comprises: with the connecting protrusion inserted into the through hole, the opening of the locking tool is press-fitted into the connecting protrusion, and the bind bar is fixed to the end plate. The power supply device according to claim 5,
A power supply device in which the locking member is a snap ring or an E-ring that is press-fitted into the connecting convex portion. A power supply device according to any one of claims 1 to 4,
The power supply device wherein the locking tool is a speed nut having an opening into which the connecting convex portion is press-fitted. A power supply device according to any one of claims 1 to 4,
The connecting convex portion is formed in a cylindrical shape, and a convex through hole is formed on the outer peripheral surface of the cylindrical shape,
The power supply device wherein the locking tool is a snap pin that is press-fitted into the convex portion through hole. A power supply device according to any one of claims 1 to 7,
A power supply device in which a protruding height (H) of the connecting convex portion protruding from the main surface of the end plate is 5 mm or less, and the connecting convex portion has a solid structure . A power supply device according to any one of claims 1 to 9,
A power supply device characterized in that the fixed piece is a bent piece of the plate-like bar. An electric vehicle comprising the power supply device according to any one of claims 1 to 10,
the power supply device;
a running motor supplied with power from the power supply device;
a vehicle body equipped with the power supply device and the motor;
An electric vehicle comprising: wheels driven by the motor to cause the vehicle body to travel. A power storage device comprising the power supply device according to any one of claims 1 to 10,
the power supply device;
A power supply controller that controls charging and discharging of the power supply device,
A power storage device characterized in that the power supply controller enables charging of the battery cell with external power and controls the battery cell to be charged.

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