WO2018235557A1

WO2018235557A1 - Power supply device, vehicle provided with same, and power storage device

Info

Publication number: WO2018235557A1
Application number: PCT/JP2018/020881
Authority: WO
Inventors: 忍寺内; 憲吾石橋; 伸一三堀
Original assignee: 三洋電機株式会社
Priority date: 2017-06-22
Filing date: 2018-05-31
Publication date: 2018-12-27
Also published as: JP2020140762A

Abstract

In order to provide a power supply device or the like in which deformation of binding bars is prevented to increase the fastening force for fastening a laminate of secondary battery cells, this power supply device (100) is provided with: a plurality of square secondary battery cells; a pair of end plates (3) that are disposed on respective end surfaces of a battery laminate (2) formed by laminating the secondary battery cells; a pair of binding bars (4) that have binding bar main surfaces (41) covering at least parts of the respective side surfaces of the battery laminate (2) and that fasten the end plates (3) to each other; and knock pins (8) that penetrate the binding bars (4), and that are pressed into the end plates (3) and fixed. The knock pins (8) are pressed into the side surfaces of the end plates (3) from the binding bar main surfaces (41) along the laminating direction of the battery laminate (2).

Description

POWER SUPPLY DEVICE, VEHICLE HAVING THE SAME, AND STORAGE DEVICE

The present invention relates to a power supply device, a vehicle provided with the same, and a power storage device.

BACKGROUND ART A power supply device in which a large number of secondary batteries are connected in series and in parallel is used in applications such as driving of vehicles. An example of such a power supply device is shown in the exploded perspective view of FIG. In the power supply device 900 shown in this figure, a large number of square secondary battery cells 901 are stacked via a spacer 902, an end plate 903 is disposed on the end face, and a binding bar 904 is fastened. The spacer 902 is made of hard resin or the like.

It is known that secondary battery cells expand due to charge and discharge. In particular, as the capacity of secondary battery cells has been increased with the recent demand for high output of batteries, the amount of expansion tends to be increased. Therefore, in order to suppress expansion of the high capacity secondary battery cell, it is necessary to increase the fastening force for fastening the laminate of the secondary battery cell more than the conventional one.

In the power supply device described above, as shown in the horizontal cross sectional view of FIG. 17, both end edges of the bind bar 904 are bent to form an L shape, and the L shaped portion 904 b is placed on the main surface side of the end plate 903 with a bolt 906. It was fixed. In this structure, when a secondary battery cell having a large expansion amount is adopted, stress is concentrated on the bent portion of the bind bar 904, and there is a possibility that the bind bar may be deformed.

JP, 2015-84331, A

The present invention has been made in view of such a background, and one of the objects thereof is a power supply device having an increased fastening force for fastening a stack of secondary battery cells by preventing deformation of a bind bar. And providing a vehicle and a power storage device provided with the same.

Means for Solving the Problems and Effects of the Invention

According to the power supply device according to the first aspect of the present invention, a plurality of rectangular secondary battery cells, and a pair of end plates disposed respectively on the end faces of the battery stack in which the secondary battery cells are stacked; While having a bind bar principal surface which covers at least a part of each side of the battery stack, a pair of bind bars for fastening the end plates to each other, and pressing the lead through the bind bars to fix the end plates The knock pin can be pressed into the side surface of the end plate from the main surface of the bind bar along the stacking direction of the battery stack. According to the above configuration, since the secondary battery cell is prevented from expanding by the engagement structure of the knock pin and the bind bar provided on the side surface of the end plate, the load is applied to the bind bar only in the tensile direction. Become. Therefore, the tensile strength of the bind bar can be used effectively

Moreover, according to the power supply device which concerns on a 2nd structure, in addition to the said structure, the bind bar fixing bolt for fixing the said bind bar to the said end plate can be provided.

Furthermore, according to the power supply device according to the third configuration, in addition to any one of the above configurations, the bind bar fixing bolt is provided from the bind bar main surface along the stacking direction of the battery stack. It can be screwed into and fixed to the side surface of the end plate. In the case of the knock pin alone, there is a possibility that the bind bar may come off, but the bind bar can be fixed by further providing a bind bar fixing bolt. The load accompanying the expansion of the secondary battery cell is received by the knock pin and the binding bar can be fixed by the bolt to prevent the binding bar from coming off. In this configuration, the bolt is not substantially loaded with the expansion of the secondary battery cell.

Furthermore, according to the power supply device of the fourth configuration, in addition to any of the above configurations, the knock pin is hollow and the bind bar fixing bolt is inserted into the hollow of the knock pin and fixed. can do. According to the above configuration, by providing the knock pin and the bind bar fixing bolt at the same site, the space efficiency can be improved, and the thickness of the end plate can be reduced.

Furthermore, according to the power supply device according to the fifth configuration, in addition to any of the above configurations, a gap can be formed between the knock pin and the bind bar fixing bolt.

Furthermore, according to the power supply device according to the sixth configuration, in addition to any one of the above configurations, the bind bar main surface is formed in a size that covers the side surface of the battery stack, and The bind bar main surface can be formed in a flat plate shape at least between the knock pins in the stacking direction of the battery stack. With the above configuration, like a structure in which the bind bar is bent to fix the bent piece portion, a structure in which stress is easily concentrated on the bent portion is avoided, and the material or thickness of the bind bar itself is not changed. It is possible to increase the rigidity of fastening the battery stack. In addition, by arranging the dowel pins on the surface along the stacking direction of the secondary battery cells, the dowel pins are arranged in a direction intersecting the shear force acting due to the expansion of the secondary battery cells and the like to receive the shear stress It is possible to increase the rigidity compared with the configuration that receives the load only with the bind bar fixing bolt.

Furthermore, according to the power supply apparatus according to the seventh configuration, in addition to any one of the above configurations, the end plate has, on its side surface, an end plate side pin hole for press-fitting the knock pin. The knock pin can be press-fit into the end plate pin hole. According to the above configuration, it is possible to press-fit the dowel pin to the side surface of the end plate to securely fix the end plate in the positioned state.

Still further, according to the power supply apparatus according to the eighth configuration, in addition to any one of the above configurations, the bind bar is formed at its end with a bind bar side knock pin hole for inserting the knock pin. The knock pin may be partially protruded from the side surface of the end plate in a state of being press-fitted into the end plate pin hole, and may be engaged with the bind bar side knock pin hole. By being configured to receive a load in the shear direction by the dowel pin, the bind bar itself can be configured to be stressed substantially only in the tensile direction.

Furthermore, according to the power supply device according to the ninth configuration, in addition to any one of the above configurations, the end plate communicates with the end plate side pin hole, and the end plate side pin hole is further inserted than the end plate side pin hole The fixing bolt holes having a reduced inner diameter can be formed, and the edge of the end plate pin hole can be formed in a curved shape at the interface between the end plate pin hole and the fixing bolt hole. According to the above configuration, compared to the case where the bottom surface of the end plate pin hole is perpendicular to the cross sectional view, the concentration of shear stress can be alleviated and breakage of the end plate can be avoided.

Furthermore, according to the power supply device according to the tenth configuration, in addition to any one of the above configurations, the knock pin is moved in a direction away from the battery stack from the center or in the thickness direction of the end plate. It can be made eccentric.

Furthermore, according to the power supply device of the eleventh configuration, in addition to any one of the above configurations, the knock pin can be formed in a tapered shape that is tapered toward the tip. With the above-described configuration, the workability at the time of assembly is improved as a shape in which the knock pin is easily press-fit.

Furthermore, according to the power supply apparatus according to the twelfth configuration, in addition to any of the above configurations, the knock pin is configured not to protrude from the end surface of the bind bar in a state where the bind bar is assembled. Can. According to the above configuration, a strong connection is realized by the fact that the bearing surface of the bind bar fixing bolt inserted into the dowel pin hits the bind bar.

Furthermore, according to the power supply device of the thirteenth configuration, in addition to any of the configurations described above, the end plate on the side to which the knock pin is to be inserted can be chamfered. According to the above configuration, it is possible to suppress a situation where stress is concentrated on the edge of the knock pin and the end plate is broken.

Furthermore, according to the power supply device in accordance with the fourteenth configuration, in addition to any of the above configurations, the knock pin can be made of metal.

Furthermore, according to the power supply device according to the fifteenth configuration, in addition to any one of the above configurations, an insulation sheet interposed between the bind bar and the battery stack can be provided.

Furthermore, the power supply device according to the sixteenth configuration can be used as a power supply device for driving a vehicle in addition to any of the above configurations.

Furthermore, a vehicle including the power supply device according to the seventeenth aspect includes the power supply device having any one of the above configurations, a driving motor supplied with power from the power supply device, the power supply device, and the motor. And a wheel driven by the motor to travel the vehicle body.

Furthermore, according to the power storage device including the power supply device according to the eighteenth aspect, the power supply device having any one of the above configurations, and a power supply controller for controlling charging and discharging of the power supply device Thus, it is possible to charge the secondary battery cell by the power from the outside and to control to charge the secondary battery cell.

It is a perspective view which shows the power supply device which concerns on Embodiment 1 of this invention. It is a disassembled perspective view of the power supply device shown in FIG. It is a horizontal sectional view in the III-III line of the power supply device of FIG. It is a principal part expanded sectional view of FIG. 5A to 5B are perspective views showing an example of the external appearance of the knock pin. FIG. 7 is a perspective view showing a power supply device according to Embodiment 2. It is a disassembled perspective view of the power supply device shown in FIG. It is a horizontal sectional view in the VIII-VIII line of the power supply device of FIG. It is a principal part enlarged plan view of FIG. 10A to 10B are perspective views showing an example of the external shape of the knock pin. It is a principal part enlarged plan view of a power supply device concerning a modification. It is a principal part expanded sectional view of a power supply device concerning a modification. FIG. 1 is a block diagram showing an example in which a battery device is mounted on a hybrid vehicle traveling by an engine and a motor. It is a block diagram which shows the example which mounts a battery apparatus in the electric vehicle which drive | works only by a motor. It is a block diagram which shows the example which uses a battery apparatus for an electrical storage apparatus. It is a disassembled perspective view which shows the conventional power supply device. It is a model horizontal cross-sectional view which shows the stress concentration to L-shaped bind bar.

Hereinafter, embodiments of the present invention will be described based on the drawings. However, the embodiments shown below are exemplifications for embodying the technical idea of the present invention, and the present invention is not limited to the following. Further, the present specification does not in any way specify the members described in the claims to the members of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the embodiments are not intended to limit the scope of the present invention thereto unless specifically described otherwise, but merely illustrative examples It is only Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for the sake of clarity. Further, in the following description, the same names and reference numerals indicate the same or similar members, and the detailed description will be appropriately omitted. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and one member is used in common as a plurality of elements, or conversely, the function of one member is realized by a plurality of members It can be shared and realized.
(Embodiment 1)

1 is a perspective view of the power supply apparatus 100 according to the first embodiment of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a horizontal sectional view taken along line III-III of the power supply apparatus 100 of FIG. The principal part expanded sectional view of is each shown in FIG. The power supply device 100 shown in these figures includes a battery stack 2 in which a plurality of secondary battery cells 1 are stacked, a pair of end plates 3 disposed at both ends of the battery stack 2, and a pair of end plates A pair of bind bars 4 are provided, the ends of which are connected to 3 to fasten the battery stack 2. An insulating sheet 7 is interposed between each bind bar 4 and the battery stack 2.
(Secondary battery cell 1)

As shown in FIG. 2, the secondary battery cell 1 is a rectangular battery whose width is wider than the thickness, that is, thinner than the width, and is stacked in the thickness direction to form a battery stack 2. The secondary battery cell 1 is a lithium ion secondary battery. However, the secondary battery cell can also be any rechargeable secondary battery, such as a nickel hydrogen battery, a nickel cadmium battery, and the like. The secondary battery cell 1 accommodates the positive and negative electrode plates together with the electrolytic solution in an enclosed can having a sealed structure. The outer can is formed by pressing a metal plate such as aluminum or aluminum alloy into a square shape, and the opening is airtightly sealed by a sealing plate. The sealing plate is made of the same aluminum or aluminum alloy as the case, and has positive and negative electrode terminals fixed at both ends. Furthermore, the sealing plate is provided with a gas discharge valve between the positive and negative electrode terminals.

The plurality of secondary battery cells 1 are stacked such that the thickness direction of each of the secondary battery cells 1 is the stacking direction, thereby forming a battery stack 2. In the secondary battery cell 1, the terminal surfaces 10 on which the positive and negative electrode terminals are provided are arranged on the same plane, and a plurality of secondary battery cells 1 are stacked to form a battery stack 2.
(Separator 12)

As illustrated in FIG. 2, the battery stack 2 sandwiches the separator 12 between the stacked secondary battery cells 1. The illustrated separator 12 is made of an insulating material in the form of a thin plate or sheet. The separator 12 shown in the figure is in the form of a plate having approximately the same size as the opposing surface of the secondary battery cell 1, and the separator 12 is stacked between the adjacent secondary battery cells 1 to form an adjacent secondary battery. The cells 1 are isolated from each other. A second spacer may be disposed between adjacent secondary battery cells 1 separately from the separator 12. The secondary battery cell 1 can be cooled by using a spacer having a shape in which a flow path of cooling gas is formed between the secondary battery cell 1 and the spacer. Moreover, the surface of the secondary battery cell 1 can also be coat | covered with an insulating material. For example, the surface of the outer can may be heat-welded except for the electrode portion of the secondary battery cell with a shrink tube such as PET resin.
(Battery stack 2)

In the battery stack 2, a metal bus bar (not shown) is connected to the positive and negative electrode terminals of the adjacent secondary battery cells 1, and the plurality of secondary battery cells 1 are connected in series or in parallel with the bus bar Connected in series and in parallel. In a battery stack 2 shown in the figure, twelve secondary battery cells 1 are connected in series. However, the present invention does not specify the number of secondary battery cells constituting the battery stack and the connection state thereof.

In the battery stack 2, the end plate 3 is disposed with the end face spacer 13 at both end faces. The end face spacer 13 is disposed between the battery stack 2 and the end plate 3 to insulate the end plate 3 from the battery stack 2 as shown in FIG. The end face spacer 13 can be made of the same material as the separator 12 described above.
(End plate 3)

As shown in FIGS. 1 and 2, the end plates 3 are arranged at both ends of the battery stack 2 and fastened via bind bars 4 arranged along both side surfaces of the battery stack 2. The end plates 3 are disposed at both ends in the stacking direction of the secondary battery cells 1 of the battery stack 2 and outside the end face spacer 13, and sandwich the battery stack 2 from both ends. The end plate 3 is made of aluminum alloy. As an aluminum alloy, Al-Cu-Mg, Al-Cu-Ni-Mg, Al-Cu-Si, Al-Si-Mg, Al-Si-Cu, Al-Si-Cu-Mg Al-Si-Cu-Ni-Mg system etc. can be used. The end plate 3 made of aluminum alloy is a heat treatment type alloy. Further, the end plate 3 made of aluminum alloy is formed by die casting. Further, the end plate 3 made of an aluminum alloy is preferably purified by heat treatment including solution treatment, quenching, aging heat treatment and the like.

The end plate 3 has a rectangular outer shape, and is disposed to face the end face of the battery stack 2. The end plate 3 shown in FIGS. 1 and 2 has an outer shape substantially equal to the outer shape of the secondary battery cell 1. In other words, in the end plate 3 shown in the figure, the width in the left-right direction is equal to the width of the secondary battery cell 1, and the height in the vertical direction is equal to the height of the secondary battery cell 1. In the present specification, the vertical direction is the vertical direction in the drawing, and the horizontal direction is the horizontal direction in the drawing and means the horizontal direction orthogonal to the stacking direction of the secondary battery cells.

Further, in the end plate 3 shown in FIG. 2, end plate side pin holes 33 for press-fitting a knock pin 8 for fixing to the bind bar 4 are respectively opened on the left and right side surfaces. The end plate 3 has a plurality of end plate pin holes 33 spaced apart in the vertical direction and opened. In the example of FIG. 2, three holes 33 for the end plate side pin in total are provided along the both sides of the end plate 3. The end plate 3 is fixed by pressing the knock pin 8 into the end plate pin hole 33. As a result, it is possible to press-fit the dowel pins 8 to the side surfaces of the end plate 3 and to fix the end plate 3 in a fixed position with certainty.
(Bind bar 4)

The side surfaces of the battery stack 2 are respectively covered with a pair of bind bars 4, and the end plates 3 are fastened with the bind bars 4 on the respective side surfaces of the battery stack 2. Each bind bar 4 has a bind bar main surface 41 formed in a size that substantially covers the side surface of the battery stack 2. The bind bar main surface 41 is formed in a flat plate shape to the end edge in the stacking direction of the battery stack 2. Further, the bind bar 4 bends the end edge of the bind bar main surface 41 in an L shape to form a bent piece 42 fixed to the outer surface of the end plate 3 with a bolt or the like. However, although the bending bar 42 can be fixed to the end plate 3 via the bolt, the load resulting from the expansion of the secondary battery cell is received by the knock pin 8 The load due to the expansion of the secondary battery cell is substantially not applied to the bent pieces 42. Therefore, stress is generated at the bent part of the bind bar

On the other hand, the bent pieces 42 are fixed to the end plate 3 with a bolt or the like, and thus function to fix the bind bar 4 so as not to be separated from the side surface of the battery stack 2. That is, in the conventional configuration in which the bind bar is fastened with a bolt or the like, it is possible to prevent the bind bar from coming off by making the bolt head larger than the hole through which the bolt passes. On the other hand, in a configuration that does not have a thick part corresponding to a bolt head such as a knock pin, in other words, when using a pin that does not have a part with an outer diameter larger than the bind bar side pin hole, binding is performed. It can not prevent the bar from coming off the knock pin. Therefore, a bending piece 42 is provided at the end edge of the binding bar 4 so that the binding bar 4 is not removed, and the bending bar 42 is fixed to the end plate 3 so that the binding bar is used while using the knock pin 8 It can be fixed so that 4 does not come off. In other words, while the load resistance is increased by the dowel pin 8 and the bending piece 42 is not given the role, by fixing the bind bar 4, the roles are efficiently shared to improve the rigidity and release. It is possible to prevent the With this configuration, the bent pieces 42 only have to be able to prevent the binding bar 4 from being detached, and since a large load is not applied, a simple fixing structure can be obtained, which is advantageous in cost. And, even if it utilizes the knock pin which does not have a thick part like a diameter of a bolt head, since the binding bar can be fixed, the advantage in terms of cost is further exhibited.

The bind bar 4 is extended in the stacking direction of the battery stack 2 as shown in FIGS. 1 and 2 and is fixed to the end plate 3 whose both ends are disposed on both end surfaces of the battery stack 2. The battery stack 2 is fastened in the stacking direction via the end plate 3. The bind bar 4 is a metal plate having a predetermined width and a predetermined thickness along the side surface of the battery stack 2, and is disposed to face both side surfaces of the battery stack 2. For the bind bar 4, a metal plate such as iron, preferably a steel plate can be used. The bind bar 4 made of a metal plate is bent by press forming or the like to be formed into a predetermined shape.

The bind bar 4 is a battery stack along the bind bar main surface 41 disposed along the side surface of the battery stack 2 and the upper and lower end portions of the middle portion excluding both ends of the bind bar main surface 41. An upper and lower bending portion 44 is provided to hold the upper and lower surfaces of the second. The bind bar main surface 41 has a rectangular shape with a size that covers substantially the entire battery stack 2 and the end plates 3 disposed at both ends thereof. The bind bar main surface 41 shown in FIG. 1 covers almost the entire side surface of the battery stack 2 without any gap. However, the bind bar main surface may be provided with one or more openings to expose part of the side surface of the battery stack. By forming the opening in the main surface of the bind bar, the battery stack can be exposed and air cooled, or a cooling gas can be supplied. In addition, even if it is not necessary to supply the cooling gas to the main surface of the binding bar from the opening, the opening may be formed on the main surface of the binding bar. This configuration can reduce the weight of the bind bar.

The upper and lower bent portions 44 hold the upper and lower surfaces of the secondary battery cells 1 constituting the battery stack 2, and the position of the terminal surface 10 of each secondary battery cell 1 is vertically offset. It is suppressing. Furthermore, in the upper and lower bent portions, bolt holes may be formed for fixing the power supply device to an object to be fixed, for example, a vehicle.

In the bind bar 4, the insulating sheet 7 is disposed on the inner surfaces of the bind bar main surface 41 and the upper and lower bent portions 44, and the insulating sheet 7 insulates the secondary battery cell 1 of the battery stack 2 from the bind bar 4. doing. Furthermore, although the binding bar is not shown, shock absorbing materials can be disposed on the inner surfaces of both ends of the main surface of the binding bar to protect both side surfaces of the end plate from an impact such as vibration.

In the present embodiment, as described above, the binding bar is bent in an L-shape at its end in the longitudinal direction, and locked at the corner from the side surface to the end surface of the end plate and then fixed at one bending side. Instead, stress pins on the bent portion of the bind bar 4 are avoided by press-fitting the dowel pins 8 into the interface between the flat main surface of the bind bar 4 and the side surface of the end plate 3, and rigidity is achieved. It can be enhanced.

That is, in the conventional configuration in which the end edge of the bind bar is bent in an L shape and fixed on the main surface side of the end plate, as shown by a broken line circle in the horizontal sectional view of FIG. When the end plate 1403 is expanded while expanding 1402, a bending moment is applied to the bent portion of the bind bar 1404, stress concentrates, and the bending may open or break.

On the other hand, by fixing the end plate 3 on the side of the bind bar main surface 41 which is flat in the longitudinal direction of the bind bar 4, shear load is applied not linearly but in a straight line. In this state, it is possible to avoid the concentration of stress and to increase the rigidity while using bind bars of the same material and thickness. That is, as shown in the horizontal cross sectional view of FIG. 3, by fixing the bind bar main surface 41 on the near side leading to the bent part, the bent part where the concentration of shear stress is likely to occur is eliminated. By making the stress applied to 4 uniform without concentrating on a specific part, it is possible to increase the rigidity while using the same bind bar by receiving the force in the pulling direction of the bind bar 4 Become.
(Knock pin 8)

The knock pin 8 is in the form of a solid metal pin. Preferred materials include stainless steel, iron and the like. The outer shape thereof may be cylindrical like the knock pin 8 shown in FIG. 5A, or may be a tapered shape, an inverted conical shape or the like which is tapered toward the tip like the knock pin 8 'shown in FIG. 5B. As described above, by making the knock pin 8 into a shape that is easy to press-in, dropout of the knock pin 8 is suppressed, and the workability at the time of assembly is improved.

Each bind bar 4 has a bind bar side pin hole 46 for press-fitting the knock pin 8 in the bind bar main surface 41. A plurality of bind bar side pin holes 46 are arranged side by side in a direction intersecting with the stacking direction of the battery stack 2.

On the other hand, each end plate 3 has an end plate side pin hole 33 for press-fitting the knock pin 8 on the side surface thereof. A plurality of end plate pin holes 33 are also arranged in a plurality in a direction intersecting with the stacking direction of the battery stack 2 in association with the bind bar side pin holes 46.

An enlarged horizontal sectional view of a connecting portion for fixing the bind bar 4 and the end plate 3 by the dowel pin 8 is shown in FIG. As described above, the dowel pin 8 penetrates the binding bar side pin hole 46 of the binding bar main surface 41 and is fixed by being pressed into the end plate side pin hole 33 on the side surface of the end plate. Thereby, while performing fixation of the bind bar 4 and the end plate 3 on the bind bar main surface 41 side, by using the knock pin 8, the diameter of the knock pin can be easily made as compared with the conventional fixation with only the bolt. Because it can be made thicker, it is possible to increase the rigidity against the shear load that acts upon expansion of the battery stack.
(Reinforcement part 5)

Furthermore, a reinforcing portion 5 may be interposed between each end plate 3 and the bind bar 4. In the example shown in FIGS. 3 and 4, the reinforcing portion 5 is provided at the interface with the end plate 3 on the bind bar 4 side. As a result, the thickness of the binding bar 4 at the fixing point of the end plate 3 can be easily adjusted, and the manufacturing cost can be reduced. That is, only the necessary portions can be made thicker while the bind bar itself is made of the conventional material, so it is not necessary to make the whole bind bar thick, and the increase in the weight of the bind bar can be suppressed. it can. The reinforcing portion 5 can be formed integrally with the bind bar 4. Note that the reinforcing portion is not necessarily essential. For example, by cutting the bind bar, the portion where the locking step is formed in advance has a thick shape. You may form.
Second Embodiment

In the above example, the bind bar 4 and the end plate 3 are fixed by the dowel pin 8. However, in the present invention, the member for fixing the bind bar and the end plate is not limited to the knock pin alone, and in addition to this, a bolt may be used. For example, from the bind bar main surface along the stacking direction of the battery stack, a bind bar fixing bolt is provided which is screwed and fixed to the side surface of the end plate through the bind bar. By combining the dowel pin and the bind bar fixing bolt in this way, rigidity against shear stress can be increased on the dowel pin side, and the bind bar and end plate can be positioned on the bind bar fixing bolt side. In other words, in the conventional configuration in which the bind bar and the end plate are fixed only by the bolt, it is necessary to give shear resistance by the bolt alone, so the diameter of the bolt is increased or the high strength bolt is used. Where it had to be used, by sharing the functions of positioning and shear resistance to the bolt and the knock pin respectively, the rigidity can be increased without using such an expensive bolt, and it can be adapted to the expansion of the battery stack. Power supply can be realized.

The bind bar locking bolt is preferably located near the knock pin. More preferably, the bind bar fixing bolt is arranged at the same position as the knock pin. For example, the knock pin is hollow, and a bind bar fixing bolt is configured to be inserted and fixed in the hollow of the knock pin. By doing this, it is possible to increase the rigidity against a shear load with the dowel pin with substantially the same configuration as that in the past, that is, at one fixed position, without increasing the fixed position. Such an example will be described as a second embodiment based on FIGS. 6 is a perspective view showing the power supply apparatus 200 according to the second embodiment, FIG. 7 is an exploded perspective view of the power supply apparatus 200 shown in FIG. 6, and FIG. 8 is a line VIII-VIII of the power supply apparatus 200 of FIG. FIG. 9 shows an enlarged plan view of an essential part of FIG. 8, respectively. The power supply apparatus 200 shown in these figures has substantially the same configuration as the power supply apparatus 200 according to the above-described first embodiment except for the fixing structure of the bind bar 4B and the end plate 3B. The detailed description is omitted.

The power supply apparatus 200 shown in FIGS. 6 to 9 press-fits the dowel pin 8B into the bind bar side pin hole 46B and the end plate side pin hole 33B on the bind bar main surface 41B side to bind the bind bar 4B to the side surface of the end plate 3B. While being fixed, the bind bar fixing bolt 6 is inserted into the hollow hole 8b formed in the dowel pin 8B and screwed with the end plate 3B.

Each knock pin 8B has a hollow cylindrical shape as shown in FIG. 10A. The size of the hollow hole 8b is set to a size that allows the knock pin 8B to be inserted. The external shape of the knock pin 8B is substantially cylindrical like the knock pin 8B shown in FIG. 10A, and has a tapered shape or an inverted conical shape or the like advancing to the tip like the knock pin 8B 'shown in FIG. It can also be done. As described above, stainless steel, iron or the like can also be used as the material of the knock pin 8B.

The bind bar fixing bolt 6 is inserted into the hollow hole 8b of the knock pin 8B and fixed to the end plate 3B. Therefore, on the side surface of the end plate 3B, as shown in the enlarged horizontal sectional view of FIG. 9, a fixing bolt hole 35 is opened in communication with the end plate pin hole 33B. The fixing bolt hole 35 has an inner diameter smaller than that of the end plate pin hole 33B, and a thread groove for screwing the bind bar fixing bolt 6 is formed on the inner surface. That is, a gap is formed between the dowel pin 8B and the bind bar fixing bolt 6 to allow slight deformation. It is sufficient for the bind bar fixing bolt 6 to have a thread groove at its tip, and it is not necessary to cut the thread groove on the entire side surface.

Further, the end plate 3B is not limited to the configuration in which the interface extending from the end plate pin hole 33B to the fixing bolt hole 35 is stepped as shown in FIG. For example, as shown in the modification of FIG. 11, it is preferable to form a smooth curved surface as it approaches the fixing bolt hole 35C from the end plate pin hole 33C for press-fitting the dowel pin 8C. As described above, by chamfering the inner wall of the end edge of the end plate pin hole 33C, shear at the time of expansion of the battery stack is obtained compared to the case where the bottom of the end plate pin hole is perpendicular to the cross section. Stress concentration can be alleviated to avoid or reduce breakage of the end plate.

Moreover, the position which provides the hole for end plate side pins in the side surface of an end plate is not restricted to the structure of making it the approximate center of the thickness direction of an end plate as shown in FIG. For example, as shown in the horizontal cross sectional view of FIG. 12 as another modification, the end plate side pin holes 33D and the fixing bolt holes 35D are provided on the side of the end plate 3D farther from the battery stack 2 than the center. It may be eccentric in the direction. In this way, the end plate of the 3D, between d ₁ and end plate 3D of the main surface and knock pin 8 which stress is applied during expansion of the cell stack 2, substantially in the thickness direction of the end plate 3B center and larger than the thickness d ₀ in the case where a knock pin 8B, can be expected to increase the rigidity against shearing force.

The knock pin preferably does not protrude beyond the end face of the bind bar when the bind bar is assembled. By doing this, the bearing surface of the bind bar fixing bolt inserted into the knock pin is prevented from floating from the bind bar, and the direct contact with the bind bar enhances the contact resistance at the seat surface and secures the connection. Is realized.

As described above, the knock pin has a hollow shape, and the bind bar fixing bolt is inserted, so that the bind bar fixing bolt is provided at the same site, and the same configuration as in the prior art is provided without increasing the number of fixing places. As in the first embodiment, shear stress is applied by the dowel pin to share the functions of the secondary battery cell restraint and the binding of the binding bar, thereby avoiding an excessive load in the shear direction on the binding bar attachment bolt. It is possible to increase the strength. In this way, by dispersing the load with the dowel pin and releasing it to the bind bar side, it is possible to reinforce only the part that is subject to shearing, eliminating the need for thickening the entire diameter of the bolt, and efficiently synthesizing at low cost. It can be improved.

Further, in the second embodiment, the bind bar 4B is a non-bent end which is not bent in an L shape at the end in the longitudinal direction. By thus forming the bind bar main surface 41B in a flat plate shape to the end in the stacking direction of the battery stack 2, as described above, the end is bent in an L shape in the longitudinal direction of the bind bar Compared to the configuration in which the end plate is locked to the corner from the side surface to the end surface, the occurrence of a stress concentration portion such as a bent portion can be avoided to enhance the rigidity.

Further, in the upper and lower bent portions 44B of the bind bar 4B, bolt holes may be formed to fix the power supply device to an object to be fixed, for example, a vehicle. In the example of FIG. 7 etc., the bolt hole 45 is formed in the lower up-and-down bending part 44B.

The above power supply device can be used as a vehicle-mounted power supply. As a vehicle equipped with a power supply device, an electric vehicle such as a hybrid vehicle or plug-in hybrid vehicle traveling with both an engine and a motor, or an electric vehicle traveling only with a motor can be used. . In addition, in order to obtain electric power for driving a vehicle, a large-capacity, high-output power supply apparatus 1000 will be described as an example in which a large number of necessary control circuits are added by connecting many of the above-described power supply apparatuses in series or in parallel. .
(Power supply for hybrid vehicles)

FIG. 13 shows an example in which the power supply device is mounted on a hybrid vehicle traveling with both an engine and a motor. The vehicle HV equipped with the power supply device shown in this figure includes a vehicle body 90, an engine 96 for traveling the vehicle body 90, a motor 93 for traveling, a power supply device 1000 for supplying electric power to the motor 93, and a power supply device 1000. A generator 94 for charging the battery, and a wheel 97 driven by the motor 93 and the engine 96 to travel the vehicle body 90 are provided. The power supply device 1000 is connected to the motor 93 and the generator 94 via the DC / AC inverter 95. The vehicle HV travels with both the motor 93 and the engine 96 while charging and discharging the battery of the power supply device 1000. The motor 93 is driven in a region where the engine efficiency is low, for example, at the time of acceleration or low speed traveling to drive the vehicle. Electric power is supplied from the power supply device 1000 to drive the motor 93. The generator 94 is driven by the engine 96 or driven by regenerative braking when the vehicle is braked, and charges the battery of the power supply device 1000.
(Power supply for electric vehicles)

Further, FIG. 14 shows an example in which the power supply device is mounted on an electric vehicle traveling only by a motor. The vehicle EV mounted with the power supply device shown in this figure includes a vehicle body 90, a traveling motor 93 for traveling the vehicle body 90, a power supply device 1000 for supplying electric power to the motor 93, and a battery of the power supply device 1000. And a wheel 97 driven by a motor 93 to travel the vehicle body 90. Electric power is supplied from the power supply device 1000 to drive the motor 93. The generator 94 is driven by energy when regenerative braking the vehicle EV, and charges the battery of the power supply device 1000.
(Power storage device for storage)

Furthermore, this power supply device can be used not only as a power source for mobiles, but also as a storage type storage equipment. For example, as a power supply for home use or factory use, a power supply system that charges with sunlight or late-night power and discharges it when necessary, or a streetlight power supply that charges sunlight during the day and discharges it at night, It can also be used as a backup power supply for driving traffic signals. Such an example is shown in FIG. In the power supply device 1000 shown in this figure, a plurality of battery packs 81 are connected in a unit form to constitute a battery unit 82. In each battery pack 81, a plurality of secondary battery cells are connected in series and / or in parallel. Each battery pack 81 is controlled by a power supply controller 84. The power supply device 1000 drives the load LD after charging the battery unit 82 with the charging power supply CP. Therefore, the power supply device 1000 has a charge mode and a discharge mode. The load LD and the charging power supply CP are connected to the power supply device 1000 via the discharge switch DS and the charging switch CS, respectively. The on / off of the discharge switch DS and the charge switch CS is switched by the power supply controller 84 of the power supply device 1000. In the charge mode, the power supply controller 84 switches the charge switch CS to ON and the discharge switch DS to OFF to allow charging of the power supply device 1000 from the charging power supply CP. Also, when the charging is completed and the battery is fully charged, or when the capacity more than a predetermined value is charged, the power supply controller 84 turns off the charging switch CS and turns on the discharging switch DS to discharge in response to a request from the load LD. It switches to the mode and permits discharge from the power supply device 1000 to the load LD. In addition, if necessary, the charge switch CS can be turned on and the discharge switch DS can be turned on to simultaneously perform the power supply of the load LD and the charging of the power supply apparatus 1000.

The load LD driven by the power supply device 1000 is connected to the power supply device 1000 via the discharge switch DS. In the discharge mode of the power supply device 1000, the power supply controller 84 switches the discharge switch DS to ON, connects it to the load LD, and drives the load LD with the power from the power supply device 1000. The discharge switch DS can use a switching element such as an FET. The ON / OFF of the discharge switch DS is controlled by the power supply controller 84 of the power supply device 1000. The power supply controller 84 also includes a communication interface for communicating with an external device. In the example of FIG. 15, the host device HT is connected according to the existing communication protocol such as UART or RS-232C. Also, if necessary, a user interface may be provided for the user to operate the power supply system.

Each battery pack 81 includes a signal terminal and a power terminal. The signal terminals include a pack input / output terminal DI, a pack abnormality output terminal DA, and a pack connection terminal DO. The pack input / output terminal DI is a terminal for inputting / outputting a signal from another battery pack or the power supply controller 84, and the pack connecting terminal DO is for inputting / outputting a signal to / from another pack battery which is a child pack. It is a terminal of. The pack abnormality output terminal DA is a terminal for outputting the abnormality of the battery pack to the outside. Furthermore, the power supply terminal is a terminal for connecting the battery packs 81 in series and in parallel. The battery units 82 are connected to the output line OL via the parallel connection switch 85 and are connected in parallel to each other.

A power supply device according to the present invention, a vehicle equipped with the same, a storage device, and a separator for the power supply device are power supplies of a plug-in hybrid electric vehicle, a hybrid electric vehicle, an electric vehicle etc. capable of switching between an EV travel mode and a HEV travel mode. It can be suitably used as an apparatus. In addition, a backup power supply that can be mounted in a rack of a computer server, a backup power supply for a wireless base station such as a mobile phone, a storage power for household use and a factory, a power supply for street lights, etc. It can also be suitably used for backup power sources such as traffic lights.

DESCRIPTION OF

SYMBOLS

100, 200, 900 ... Power supply device, 1 ... Secondary battery cell, 2, 1402 ... Battery laminated body, 3, 3B, 3C, 3D, 1403 ... End plate, 4, 4B, 1404 ... Binding bar, 5 ... Reinforcement part , 6 ... bind bar fixing bolt, 7 ... insulation sheet, 8, 8 ', 8B, 8B', 8C ... knock pin; 8b ... hole portion, 10 ... terminal surface, 12 ... separator, 13 ... end face spacer, 33, 33B, 33C, 33D: hole for pin on the end plate side, 35, 35C, 35D: hole for fixing bolt, 41, 41B: bind bar main surface, 42: bent piece, 44, 44B: upper and lower bent portion, 45: bolt hole , 46, 46B, 46C: hole for pin for binding bar side, 81: battery block, 82: battery unit, 84: power controller, 85: parallel connection switch, 90: vehicle body, 93: mo , 94: generator, 95: DC / AC inverter, 96: engine, 97: wheel, 901: secondary battery cell, 902: spacer, 903: end plate, 904: bind bar; 904b: L-shaped portion, 906 ... Volt, 1000 ... Power supply device, HV ... Vehicle, EV ... Vehicle, CP ... Power supply for charging, LD ... Load, DS ... Discharge switch, CS ... Charge switch, OL ... Output line, HT ... Host device, DI ... I / O Terminal, DA ... abnormal output terminal, DO ... connection terminal.

Claims

With multiple rectangular secondary battery cells,
A pair of end plates respectively disposed on end faces of the battery stack in which the secondary battery cells are stacked;
A pair of bind bars having a bind bar main surface covering at least a part of each side surface of the battery stack, and fastening the end plates together;
And a dowel pin that is press-fit and fixed to the end plate through the binding bar;
The power supply device in which the said knock pin is press-fit in the side surface of the said end plate from the said bind bar main surface in alignment with the lamination direction of the said battery laminated body.
The power supply device according to claim 1, further comprising:
A power supply apparatus comprising a bind bar fixing bolt for fixing the bind bar to the end plate.
The power supply device according to claim 2,
The said bind bar fixing bolt penetrates the said bind bar from the said bind bar main surface in alignment with the lamination direction of the said battery laminated body, and is screwed together and fixed to the side surface of the said end plate.
The power supply device according to claim 3,
Making the knock pin hollow;
A power supply apparatus configured to insert and fix the bind bar fixing bolt into the hollow of the knock pin.
The power supply device according to claim 4,
A power supply device in which a gap is formed between the knock pin and the bind bar fixing bolt.
The power supply device according to any one of claims 1 to 5, wherein
The bind bar main surface is formed in a size to cover the side surface of the battery stack, and the bind bar main surface is flat at least between the knock pins in the stack direction of the battery stack. Power supply unit formed.
The power supply device according to any one of claims 1 to 6, wherein
The end plate is formed on its side surface with a hole for an end plate pin for press-fitting the knock pin,
The power supply device in which the knock pin is press-fit into the hole for pin for the end plate side.
The power supply device according to claim 7, wherein
The bind bar is formed at its end with a hole for a bind bar side knock pin for inserting the knock pin,
The power supply device in which the knock pin partially protrudes from the side surface of the end plate and is engaged with the hole for the bind bar side knock pin in a state where the knock pin is pressed into the end plate pin hole.
A power supply device according to claim 7 or 8, wherein
The end plate communicates with the end plate pin hole to form a fixing bolt hole whose inner diameter is smaller than that of the end plate pin hole.
A power supply device in which an end edge of the end plate side pin hole is formed in a curved shape at an interface between the end plate side pin hole and a fixing bolt hole.
The power supply device according to any one of claims 1 to 9, wherein
The power supply device, wherein the knock pin is disposed eccentrically in a direction away from the battery stack in the center or in the thickness direction of the end plate.
The power supply device according to any one of claims 1 to 10, wherein
The power supply apparatus in which the said knock pin is formed in the taper shape which becomes tapered shape toward the front-end | tip.
The power supply device according to any one of claims 1 to 11, wherein
A power supply apparatus configured such that the knock pin does not protrude from an end face of the bind bar in a state where the bind bar is assembled.
The power supply device according to any one of claims 1 to 12, wherein
The power supply device in which the said end plate chamfers the edge of the side which inserts the said knock pin.
The power supply device according to any one of claims 1 to 13, wherein
The power supply device in which the knock pin is made of metal.
The power supply device according to any one of claims 1 to 14, further comprising:
A power supply device comprising an insulating sheet interposed between the bind bar and the battery stack.
The power supply device according to any one of claims 1 to 15, wherein
A power supply device that is a power supply device for driving a vehicle.
A vehicle comprising the power supply device according to any one of claims 1 to 15,
The power supply apparatus, a traveling motor supplied with power from the power supply apparatus, a vehicle body on which the power supply apparatus and the motor are mounted, and a wheel driven by the motor to cause the vehicle body to travel vehicle.
A power storage device comprising the power supply device according to any one of claims 1 to 15,
The power supply device, and a power supply controller that controls charging and discharging of the power supply device;
A storage device characterized in that the power supply controller enables charging of the secondary battery cell with power from the outside and controls the secondary battery cell to be charged.