WO2013031612A1

WO2013031612A1 - Power supply device, vehicle provided with same, and power storage device

Info

Publication number: WO2013031612A1
Application number: PCT/JP2012/071240
Authority: WO
Inventors: 一広藤井; 高志瀬戸
Original assignee: 三洋電機株式会社
Priority date: 2011-08-26
Filing date: 2012-08-22
Publication date: 2013-03-07

Abstract

[Problem] To inexpensively achieve a waterproofing structure for battery cells. [Solution] This power supply device comprises: a battery stack (5) in which a plurality of secondary battery cells (1) having an angular outer shape are stacked; a pair of end plates (3) arranged at the respective end surfaces of the battery stack (5); and a fastening member (4) that covers the side surfaces of the battery stack (5) and fastens the battery stack (5) by fixing the end plates (3) together. The power supply device further comprises a water-resistant, insulative waterproofing sheet (38) that is arranged between the fastening member (4) and the side surfaces of the battery stack (5) and that covers the battery cells in a watertight fashion. The waterproofing sheet (38) is stretchable.

Description

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

The present invention mainly includes a high-current power supply device used for a power supply of a motor for driving a vehicle such as a hybrid vehicle or an electric vehicle, or a storage application for household use or a factory, and such a power supply device. The present invention relates to a vehicle and a power storage device.

There is a demand for a power supply device with high output, such as a battery pack for vehicles. In such a power supply device, a large number of battery cells are connected in series to increase the output voltage and increase the output power. A battery cell generates heat when charged and discharged with a large current. In particular, as the number of battery cells used increases, the calorific value also increases. Therefore, a heat dissipation mechanism for thermally conducting and radiating the heat dissipation of the battery cell efficiently is required. As such a heat dissipation mechanism, in addition to an air cooling system that blows a cooling air to the battery cell, a system in which a cooling pipe which supplies and circulates a refrigerant is brought into contact with the battery cell and directly cooled by heat exchange is also proposed. See, for example, Patent Documents 1 to 3. In such a battery system, for example, as shown in FIG. 13, a cooling pipe 260 for circulating the refrigerant is disposed on the lower surface of the battery stack 205 in which the battery cells 201 are stacked, and is connected to the cooling mechanism 269. Heat is taken from the battery stack 205 via the cooling pipe 260 or the cooling plate 261 for cooling.

In these cooling methods, it is possible to deprive the battery cells of heat more efficiently by heat exchange using a refrigerant, as compared with an air cooling type cooling method in which cooling air is blown to gaps between adjacent battery cells. On the other hand, because the cooling part becomes relatively low temperature due to high cooling performance, the temperature may fall below the dew point, moisture in the air may be cooled and dew condensation may occur on the surface of the battery cell. When such condensation occurs, unintended energization may occur or corrosion may occur. In addition to condensation, it is considered that moisture intrudes into the inside due to rain or the like, and a waterproof structure is required as well.

However, particularly on the side surface of the battery stack, a gap is formed between the battery cells, and the battery case can is expanded by repeating charging and discharging, so that it is not easy to realize a complete waterproof structure. In addition, there is also a problem that if a waterproof structure is to be realized, the structure becomes complicated and the manufacturing and parts costs become high. Therefore, there has been a demand for a solution to the contradictory problem of realizing a complete waterproof structure with an inexpensive structure.

JP, 2009-134901, A JP, 2009-134936, A JP, 2010-15788, A Japanese Utility Model Publication No. 34-16929 Japanese Patent Application Publication No. 2005-149837 Japanese Patent Application Laid-Open No. 2002-100407

The present invention has been made to solve such conventional problems. The main object of the present invention is to provide a power supply capable of realizing a waterproof structure of a battery cell inexpensively, a vehicle provided with the same, and a storage device.

Means for Solving the Problems and Effects of the Invention

In order to achieve the above object, according to a power supply device according to a first aspect of the present invention, a battery stack in which a plurality of secondary battery cells having a square outer shape are stacked, and both end surfaces of the battery stack A power supply device further comprising: a pair of end plates respectively disposed in the first and second end plates; and a fastening member for covering the side faces of the battery stack and fastening the battery stack by fixing the end plates to each other. A waterproof and insulating waterproof sheet is disposed between the fastening member and the battery stack side surface and covers the battery cells in a watertight manner, and the waterproof sheet can be provided with stretchability. Thus, the waterproof structure of the power supply device can be realized with an extremely simple configuration. In particular, even if the laminated secondary battery cell is expanded by the expandable waterproof sheet, the waterproof sheet can be expanded and contracted together following this, and the waterproof structure can be maintained, thereby enhancing the reliability of waterproofness. be able to.

Moreover, according to the power supply device which concerns on a 2nd side surface, the said waterproof sheet can provide an adhesive layer in the surface which covers the said battery laminated body. Thereby, a waterproof sheet can be easily stuck on the side of a battery laminated body, and the advantage which can save labor of an assembly operation | work is acquired.

Furthermore, according to the power supply device which concerns on a 3rd side, the said waterproof sheet can be comprised in the sheet | seat shape made from rubber. Thereby, a waterproof structure can be realized using an inexpensive rubber sheet.

Furthermore, according to the power supply device according to the fourth aspect, the end plate can cover the end face of the battery stack in a watertight state. Thereby, the end face side of the battery stack can be made waterproof by the end plate.

Furthermore, according to the power supply device according to the fifth aspect, a circuit board on which an electronic circuit electrically connected to the secondary battery cell is further mounted, a substrate holder for holding the circuit substrate, and the substrate holder A holder cover for holding the lower surface of the battery stack, and the holder cover can be fixed in a watertight manner on the upper surface of the battery stack. Thereby, the upper surface of the battery stack can be closed in a waterproof state using the holder cover, and a waterproof structure using the existing substrate holder can be realized inexpensively without adding a member for waterproofing.

Furthermore, according to the power supply device of the sixth aspect, an elastic member can be interposed between the substrate holder and the upper surface of the holder cover. Thereby, the gap between the upper surface of the battery stack and the substrate holder can be filled with the elastic member, and the waterproof structure is reliably maintained.

Furthermore, according to the power supply device according to the seventh aspect, the substrate holder can be provided with a gas duct in communication with a safety valve that discharges the gas inside the secondary battery cell. As a result, the airtight structure for the safe discharge of gas can be combined with the waterproof structure of the secondary battery cell, and the advantage that the configuration can be simplified can be obtained.

Furthermore, according to the power supply device according to the eighth aspect, the power supply device further includes an insulating separator interposed between adjacent secondary battery cells that constitute the battery stack, and the upper portion of the separator A locking hook may be provided for securing the substrate holder. Thereby, while insulating between secondary battery cells with a separator, a substrate holder can be fixed to the upper surface of a battery layered product.

Furthermore, according to the power supply device according to the ninth aspect, the heat conduction sheet for covering the bottom surface of the battery stack is further provided, and the waterproof sheet is bent in an L shape in cross sectional view, The bent portions continuously cover the corners of the battery stack from the side to the bottom of the battery stack and overlap the heat conduction sheet at the bottom of the battery stack. Can be covered with a tarpaulin. Thereby, waterproofness in the interface of the bottom of a battery layered product and a heat conductive sheet is achieved, maintaining insulation between the cooling plates for cooling arranged at the bottom of a battery layered product.

Furthermore, according to the power supply device according to the tenth aspect, the power supply device further includes a cooling plate which is disposed on the bottom side of the battery stack and allows heat exchange with the battery stack by flowing the refrigerant into the inside. A thermally conductive sheet may be interposed between the cooling plate and the bottom surface of the battery cell to be connected in a thermally coupled state.

Furthermore, a vehicle according to an eleventh aspect is provided with the power supply device.

Still further, a power storage device according to a twelfth aspect includes the power supply device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a disassembled perspective view of a power supply device provided with the power supply device which concerns on Example 1 of this invention. It is a perspective view which shows the assembled battery of FIG. It is a disassembled perspective view which shows the state which removed the cooling plate from the battery laminated body of FIG. It is the perspective view which looked at the battery laminated body of FIG. 2 from diagonally downward. It is a disassembled perspective view which shows the assembled battery of FIG. It is a disassembled perspective view of the battery laminated body of FIG. FIG. 7 is a vertical sectional view taken along line VII-VII of the battery stack of FIG. 2; FIG. 8 is a vertical cross-sectional view taken along line VIII-VIII of the battery stack of FIG. 2; It is a model top view which shows the arrangement | positioning state of a cooling plate. It is a block diagram showing an example which mounts a power supply device in a hybrid car which runs with an engine and a motor. It is a block diagram which shows the example which mounts a power supply device in the electric vehicle which drive | works only by a motor. It is a block diagram which shows the example applied to the power supply device for electrical storage. It is a perspective view which shows the cooling mechanism of the conventional power supply device.

Hereinafter, embodiments of the present invention will be described based on the drawings. However, the embodiment shown below is an example of a power supply apparatus for embodying the technical idea of the present invention, a vehicle equipped with the same, and a power storage apparatus, and the present invention is a power supply apparatus and a vehicle equipped with the same The storage device is not specified as follows. Moreover, the members shown in the claims are not limited to the members of the embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention to only the specific description unless they are specifically described. It is just an example. 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 the same 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. In addition, the contents described in some examples and embodiments may be applicable to other examples and embodiments.
Example 1

An example in which the power supply apparatus 100 according to the first embodiment of the present invention is applied to an on-vehicle power supply apparatus will be described with reference to FIGS. 1 to 8. The power supply device 100 is mainly mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle, and is used as a power source for supplying electric power to a traveling motor of the vehicle to drive the vehicle. However, the power supply device of the present invention can be used for electric vehicles other than hybrid vehicles and electric vehicles, and can also be used for applications requiring high output other than electric vehicles.
(Power supply device 100)

The external appearance of the power supply device 100 is a box shape whose upper surface is rectangular as shown in the exploded perspective view of FIG. 1. The power supply device 100 divides a box-shaped exterior case 70 into two and accommodates a plurality of assembled batteries 10 inside. The outer case 70 includes a lower case 71, an upper case 72, and end plates 73 connected to the lower case 71 and both ends of the upper case 72. The upper case 72 and the lower case 71 each have a flange 74 projecting outward, and the flange 74 is fixed by a bolt and a nut. The outer case 70 has a collar 74 disposed on the side of the outer case 70. Further, in the example shown in FIG. 1, the battery stack 5 is housed in the lower case 71 in total of four in the longitudinal direction, two in the longitudinal direction and two in the lateral direction. Each battery stack 5 is fixed at a fixed position inside the exterior case 70. The end surface plate 73 is connected to both ends of the lower case 71 and the upper case 72 and closes the both ends of the exterior case 70.
(Battery battery 10)

The battery assembly 10 is configured of four battery stacks 5 in the example shown in FIG. 1. That is, two battery stacks 5 are connected in the stacking direction of the rectangular battery cell 1 to form one battery stack continuum 10B, and two battery stack continuum 10B in such a connected state are arranged in parallel The battery assembly 10 is configured.

A perspective view of each battery stack 5 constituting the assembled battery 10 is shown in FIG. The battery stack 5 is fixed on a cooling plate 61 for cooling it. The battery stack 5 is provided with a connecting structure for fixing on the cooling plate 61 as shown in FIGS. 2 to 4 (details will be described later). In these figures, FIG. 3 is an exploded perspective view of the battery stack 5 from which the cooling plate 61 is removed, as viewed obliquely from above, and FIG. 4 is a perspective view of the same as viewed obliquely from below.

Furthermore, FIG. 5 shows an exploded perspective view of the battery stack 5 with the fastening member 4 etc. removed, and FIG. 6 shows an exploded perspective view of the stack structure of the separator 2 and the secondary battery cell 1 constituting the battery stack 5 respectively. . As shown in FIG. 5 and FIG. 6, each battery stack 5 is interposed between the plurality of secondary battery cells 1 and the plurality of secondary battery cells 1 stacked on each other, and between the secondary battery cells 1 Arranged on both end faces of the battery stack 5 and a pair of end plates 3 arranged on the end face of the battery stack 5 in which the plurality of secondary battery cells 1 and the separators 2 are alternately stacked. And a waterproof sheet 38 disposed between the fastening member 4 and the side surface of the battery stack 5 to cover the secondary battery cells 1 in a watertight manner. ing.
(Battery stack 5)

As shown in FIG. 6, in the battery stack 5, a plurality of secondary battery cells 1 are stacked via an insulating separator 2. Furthermore, as shown in FIG. 5, a pair of end plates 3 are disposed on both end surfaces of the battery stack 5, and the pair of end plates 3 are connected by the fastening member 4. In this manner, a battery stack is formed by alternately laminating a plurality of secondary battery cells 1 and separators 2 with the separators 2 which insulate the mutually adjacent secondary battery cells 1 interposed between the stacked surfaces of the secondary battery cells 1. I have a body of five.
(Secondary battery cell 1)

As the secondary battery cell 1 is shown in FIG. 6, the exterior can which comprises the external shape is made into the square which made thickness thinner than width. While providing the positive / negative electrode terminal 1b in the sealing board 1a which obstruct | occludes this armored can, the safety valve 1c is provided between the electrode terminals 1b. The safety valve 1 c is configured to be opened when the internal pressure of the outer can rises to a predetermined value or more, and to release the gas inside. By opening the safety valve 1c, the internal pressure increase of the outer can can be stopped. The unit cells constituting the secondary battery cell 1 are chargeable secondary batteries such as lithium ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries and the like. In particular, when a lithium ion secondary battery is used for the secondary battery cell 1, there is a feature that the charging capacity with respect to the volume and mass of the entire battery cell can be increased. Furthermore, the battery cell used in the present invention is not limited to the rectangular battery cell, but may be a rectangular battery cell or a laminated battery cell of a prismatic shape or other shape in which the outer package is covered with a laminate material.

The secondary battery cells 1 which are stacked to form the battery stack 5 are connected in series by connecting adjacent positive and negative electrode terminals 1 b with the bus bars 6. The assembled battery 10 in which the adjacent secondary battery cells 1 are connected in series with each other can increase the output voltage to increase the output. However, an assembled battery can also connect adjacent secondary battery cells in parallel, or combine serial connection and parallel connection, and can also be many direct many parallel or many parallel direct. Moreover, the secondary battery cell 1 is manufactured by the metal-made outer can. The secondary battery cell 1 sandwiches a separator 2 of an insulating material in order to prevent shorting of the external cans of the adjacent secondary battery cells 1. The outer can of the secondary battery cell can also be made of an insulating material such as plastic. In this case, since the secondary battery cell does not need to insulate and stack the outer cans, the separator may be made of metal or the separator may be unnecessary.
(Separator 2)

The separator 2 is a spacer that electrically and thermally insulates the adjacent secondary battery cells 1 and stacks them. The separator 2 is made of an insulating material such as plastic and disposed between adjacent secondary battery cells 1 to insulate the adjacent secondary battery cells 1. As shown in the exploded perspective view of FIG. 5, the separator 2 forms a battery cell storage space 2 d on both sides for storing the secondary battery cells 1. Therefore, the separator 2 has a flat plate 2a of substantially the same size as the main surface of the secondary battery cell 1, a side wall 2b covering the side surface of the secondary battery cell 1, and a part of the top surface of the secondary battery cell 1 And a top plate 2c to be coated. In the separator 2, the secondary battery cell 1 is sandwiched between two separators 2 to close the side portion. Therefore, by fixing the flat plate 2a at substantially the center of the side wall 2b while making the side wall 2b substantially the same size as the side face of the secondary battery cell 1, half of the side wall 2b is used in each battery cell storage space 2d. About half of the side surface of the secondary battery cell 1 is covered. Further, the upper surfaces of the battery cell storage space 2d are adjacent to each other so that the electrode terminals 1b and the safety valve 1c are exposed while partially covering the sealing plate 1a of the secondary battery cell 1 with the top plate 2c. Covering the top of the interface. On the other hand, the bottom side is opened to expose the bottom of the secondary battery cell 1. A cooling plate 61, which will be described later, is disposed in the opening portion of the bottom surface to cool the bottom surface of each secondary battery cell 1 by heat exchange.
(Extended part 2e)

However, as shown in the exploded perspective view of FIG. 5, an overhanging portion 2e is provided in which the side wall 2b is extended from the lower portion of the side surface to the bottom surface so as to cover the corner for positioning the secondary battery cell 1. Further, the lower end of the flat plate 2 a is slightly shorter than the secondary battery cell 1 between the left and right lower ends of the separator 2 between the portions provided with the projecting portions 2 e. With such a configuration, the lower surface of the secondary battery cell 1 can not contact the cooling plate if the lower end of the separator 2 temporarily protrudes beyond the secondary battery cell 1 due to manufacturing tolerance of the separator 2 or the like. You can avoid the situation.

On the other hand, the side wall 2 b of the separator 2 is formed slightly higher than the secondary battery cell 1 as shown in the exploded perspective view of FIG. 5. Further, the top plate 2 c is fixed at a position substantially at the same height as the secondary battery cell 1. As a result, in the state where the secondary battery cell 1 is stored in the battery cell storage space 2 d of the separator 2, the side walls 2 b on both sides of the upper surface of the battery stack 5 slightly protrude. The holder cover 25 is fixed to the upper surface using the protruding side wall 2b as a guide. Further, a locking hook 31 for fixing the holder cover 25 is also provided on the inner surface side of the side wall 2b, that is, the side provided with the top plate 2c (details will be described later). Furthermore, a pressed portion 32 for receiving the upper surface holding portion 43 of the fastening member 4 is formed on the outer surface side of the side wall 2 b. The pressed portion 32 is formed in a step shape, and has a step surface 33 on the horizontal surface, and a wall surface portion 34 formed in a valley shape on the back side of the step surface 33.

Each separator 2A uses a plurality of those having the same shape. However, as shown in the exploded perspective view of FIG. 5, the shape of only the separator disposed at the interface between the secondary battery cell 1 and the end plate 3 on the end face of the battery stack 5 is changed. The end face separator 2B insulates the end plate 3 made of metal and the secondary battery cell 1 at the end face. Each of the end face separators 2B has the battery cell storage space 2d formed on one side only, and the other side has a flat plate shape to be in contact with the end plate 3, and the side wall 2b is not protruded. Further, a protrusion 2 f for fixing a holder cover 25 (described later) is formed on the upper side thereof.

In the battery stack, it is not necessary to interpose a separator between secondary battery cells. For example, secondary batteries adjacent to each other are formed by molding the outer can of the secondary battery cell with an insulating material, or coating the outer periphery of the outer can of the secondary battery cell with a heat-shrinkable tube, insulating sheet, insulating paint, etc. By insulating the cells from one another, the separator can be eliminated. In particular, regardless of the air-cooling type that cools the secondary battery cells by forcedly blowing the cooling air between the secondary battery cells, a system that cools the battery stack via a cooling plate cooled using a refrigerant or the like In the adopted configuration, it is not necessary to interpose a separator between the secondary battery cells. Furthermore, in a configuration adopting a method of cooling the battery stack via a cooling plate cooled using a refrigerant or the like, the cooling battery is forcedly blown between the secondary battery cells to cool the secondary battery cells. Since it is not necessary to provide an air passage for flowing a cooling air in the insulating separator interposed between the rectangular battery cells as in the air cooling type, the length in the lamination direction of the rectangular battery cells is shortened. Thus, the battery stack can be miniaturized.
(End plate 3)

As shown in FIG. 5, a pair of end plates 3 is disposed on both end surfaces of the battery stack 5 in which the secondary battery cells 1 and the separators 2 are alternately stacked and the waterproof sheet 38 is attached to the side surface. The battery stack 5 is fastened by the pair of end plates 3 so as to be held from both sides. Both end portions of the end plate 3 are provided with bent portions 3b which are bent in a U-shape in cross section, and the side wall 2b of the end face separator 2B is covered with the bent portions 3b. The end plate 3 is made of a material exhibiting sufficient strength, such as metal. The end plate 3 can also be provided with a fixing structure for fixing to the lower case 71 shown in FIG. 1 or a fixing structure such as a holder cover 25 disposed on the upper surface.
(Laminate connection piece 7)

The end plate 3 has screw holes for fixing with the fastening member 4 at four corners. Furthermore, as shown in the exploded perspective view of FIG. 5, it is also possible to fix the laminate connection piece 7 for connecting the battery stacks 5 to each other by using the same screw hole. The laminate connection piece 7 is a metal piece having substantially the same height as the end plate 3, and a portion thereof is on the side of the battery laminate 5 in the opposite direction to the fastening member 4, that is, on the surface side of the end plate 3. A bent piece 7b bent to protrude is provided. In the example of FIG. 5, three bent pieces 7 b are provided in the longitudinal direction, and a battery stack body adjacent in the stacking direction of the secondary battery cells 1 is formed by opening a screw hole in a part of the bent pieces 7 b. 5 can be connected via this screw hole. Of course, it is needless to say that the connection between the battery stacks 5 can be appropriately made by using other connection structures other than screwing through screw holes.
(Fastening member 4)

As shown in FIGS. 2 to 5, the fastening members 4 are disposed on both sides of the battery stack 5 whose both end surfaces are covered with the end plate 3, and are fixed to the pair of end plates 3. To conclude. As shown in the exploded perspective view of FIG. 5, the fastening member 4 is bent at both ends of the main body 41 covering the side surface of the battery stack 5 and at both ends of the main body 41 and is fixed to the end plate 3. 42, a plurality of upper surface holding portions 43 provided on the upper edge of the main body portion 41, a lower surface projecting portion 45 which is bent at the lower edge of the main body portion 41 and holds a part of the lower surface of the battery stack 5; And the fastening connection part 44 protruded. Such a fastening member 4 is made of a material having sufficient strength, for example, a metallic fastener.
(Upper surface holding portion 43)

A plurality of upper surface holding parts 43 for pressing the upper surface of the battery stack 5 are partially provided at the upper edge of the fastening member 4. In the example of the exploded perspective view of FIG. 5, a plurality of wavy slits are provided in the vicinity of the upper end edge of the main body 41, and the rectangular portion between the slit and the upper end is protruded in a mountain shape. Such an upper surface holding portion 43 can be integrally formed by processing the fastening member 4 of the metal plate. By setting the protruding direction of this chevron to the battery stack 5 side, the step-like pressed portion 32 formed on the side wall 2 b of the separator 2 at the lower end of the projected rectangular portion, that is, the upper edge of the slit. The upper surface plate 2 c of the separator 2 presses the upper surface of the battery stack 5 by pressing the step surface 33. Thus, the upper surface holding portion 43 of the fastening member 4 indirectly presses the upper surface of the battery stack 5 via the separator 2. In particular, by providing the upper surface holding portion 43 for each separator 2, an advantage can be obtained in which the pressed portions 32 provided for each separator 2 can reliably press each separator 2. In addition, by pressing the upper surface of the battery stack 5 every separator 2, that is, at a plurality of spaced locations, the upper surface of the battery stack 5 can be made to approach a certain height.

Furthermore, as described above, the upper surface holding portion 43 is protruded in a mountain shape on the inner surface side of the fastening member 4, while the pressed portion 32 receiving this is formed in a valley shape along the mountain shape on the side surface side of the separator 2. When attaching the fastening member 4 to the side surface of the battery stack 5, the chevrons of the upper surface holding portions 43 can be easily guided to the valley-shaped pressed portions 32, and the plurality of upper surface holding portions 43 are subject to each separator 2. It is possible to easily perform the operation of inserting into the pressing portion 32.

In addition, when the fastening member 4 is fixed by forming the locking hook 31 described later so as to protrude inward from the back surface side of the wall surface portion 34, that is, the side surface of the battery stack 5, a valley shaped wall surface portion The locking hook 31 formed on the back surface side of 34 acts in a direction to be pushed further inward, and the advantage that the locking of the hook receiving portion 35 provided on the holder cover 25 can be made strong is also obtained.
(Tight sheet 38)

A waterproof sheet 38 is attached to the side surface of the battery stack 5 as shown in FIG. The side wall 2 b of the separator 2 is exposed by laminating the secondary battery cells 1 via the separator 2 on the side surface of the battery stack 5. Therefore, the gap formed between the side walls 2 b of the separator 2 is closed by the waterproof sheet 38. The waterproof sheet 38 is preferably made of a material having waterproofness and insulation and further having elasticity and stretchability. For example, it can be made of resin such as rubber sheet. As a result, even if the secondary battery cells 1 constituting the battery stack 5 expand, the waterproof sheet 38 can be elastically deformed to absorb changes, and the waterproofness can be maintained. As the rubber sheet, for example, a flexible material such as EPDM or PVC with an acrylic double-sided adhesive tape attached can be used.

The waterproof sheet 38 is attached only to the side surface of the battery stack 5. The end face of the battery stack 5 is coated with the end plate 3 as described above. Here, the waterproof sheet 38 is elastically deformed by fixing the surface of the waterproof sheet 38 attached to the side wall 2b of the end face separator 2B with the fastening member 4 in a state of being sandwiched by the bent portion 3b of the end plate 3 Thus, a watertight structure capable of avoiding flooding from the side surface of the end plate 3 is also realized on the end surface of the battery stack 5.

Further, it is preferable that the waterproof sheet 38 be provided with an adhesive layer on the surface covering the battery stack 5. For example, the waterproof sheet 38 can be easily attached by using an adhesive tape shape.

Furthermore, as shown in FIG. 5, the waterproof sheet 38 has the end edge of the lower end bent in an L shape in cross section. The bent portion covers the corner from the side surface to the bottom surface of the battery stack 5. Further, a heat conductive sheet (details will be described later) disposed on the bottom of the battery stack 5 is disposed so as to overlap the bent portion 38 b of the waterproof sheet 38. Thereby, the bottom surface of the secondary battery cell 1 constituting the battery stack 5 is completely covered with the waterproof sheet 38 and the heat conductive sheet, and fixed on the cooling plate 61 in a state where the waterproof property is maintained ( Details will be described later).
(Holder cover 25)

Furthermore, the upper surface of the battery stack 5 is closed by the holder cover 25 as shown in the exploded perspective view of FIG. 5. Further, the holder cover 25 fixes the substrate holder 27 on the upper surface thereof. The substrate holder 27 holds the circuit board 28 and closes the upper surface thereof with the shield plate 29. In order to show the fixing structure of the holder cover 25 and the battery stack 5, a vertical sectional view taken along the line VII-VII in FIG. 2 is shown in FIG.
(Locking hook 31)

The holder cover 25 is locked with the separator 2 by a locking structure. The locking structure is configured by the locking hook 31 provided on the separator 2 in the example of the cross-sectional view of FIG. 7. The locking hook 31 is provided on the back surface of the wall portion 34 and has a claw-like tip protruding toward the center of the separator 2. In this example, the position of the locking structure is located outside the electrode terminal 1b of the battery cell.
(Hook receiver 35)

The locking hook 31 is locked to a hook receiving portion 35 provided on the holder cover 25. The hook receiving portion 35 is provided on the side surface of the holder cover 25. As described above, since the side walls 2b of the separator 2 positioned on both sides of the upper surface of the battery stack 5 are slightly protruded, the holder cover 25 is formed between the side walls 2b protruding from the left and right sides. It is inserted and fixed. At this time, since the step-like pressed portion 32 formed on the side wall 2b is formed in a valley shape, the side surface of the holder cover 25 is also formed in a concavo-convex pattern along the valley shape. Such a concavo-convex pattern can also be used for positioning of the holder cover 25. Further, the hook receiving portion 35 is provided in the concave portion of the concavo-convex pattern, that is, the portion where the back surface of the valley-like pressed portion 32 is inserted.

Further, the holder cover 25 is provided with an opening for connecting the electrode terminal 1 b of the secondary battery cell 1. Preferably, as shown in the exploded perspective view of FIG. 5, a plurality of bus bars 6 for connecting the electrode terminals 1 b are insert-molded in the holder cover 25. Thus, by fixing the holder cover 25 to the upper surface of the battery stack 5, the bus bar 6 and the electrode terminal 1b can be simultaneously connected, which also contributes to the improvement of the workability.

Further, the bottom surface of the holder cover 25 is also provided with an opening at a position corresponding to the safety valve 1 c of each battery cell. This opening is in communication with the gas duct 26 incorporated in the substrate holder 27 fixed to the upper surface of the holder cover 25.

The holder cover 25 is preferably fixed to the upper surface of the battery stack 5 in a watertight manner. For this reason, as shown in the cross-sectional view of FIG. 7, it is designed such that no gap is generated in a state where the locking hook 31 provided on the separator 2 is locked to the hook receiving portion 35 of the holder cover 25. Moreover, you may arrange | position elastic members, such as packing, in the clearance gap of the junction part of a holder cover and a battery laminated body as needed.

Further, as shown in the exploded perspective view of FIG. 5, the waterproof sheet 38 is provided with a plurality of notches 38 c at the upper end portion. The notch 38c is provided at a position corresponding to the locking hook 31, and in other words, the locking hook 31 and the hook receiving portion can be locked with the hook receiving portion 35 without sandwiching the waterproof sheet 38. It is formed so as not to inhibit locking with 35. By providing such a notch 38 c, useless deformation of the waterproof sheet 38 can be avoided, and the sealing performance of the waterproof sheet 38 can be enhanced.
(Substrate holder 27)
(Elastic member 30)

The substrate holder 27 is fixed to the upper surface of the holder cover 25. An elastic member 30 is interposed between the holder cover 25 and the substrate holder 27. As a result, as shown by the enlarged view in the cross-sectional view of FIG. 7, the waterproof structure is surely exhibited by filling the gap between the upper surface of the battery stack 5 and the substrate holder 27 with the elastic member 30. A packing, an O-ring, a gasket or the like can be used as such an elastic member 30.

As described above, rather than fixing the substrate holder 27 directly on the upper surface of the battery stack 5 to realize a waterproof structure, the holder cover 25 and the substrate holder are first covered with the holder cover 25 covering the upper surface of the battery stack 5. By connecting 27 with each other, the holder cover 25 makes the holder cover 25 correspond to the electrode terminals 1 b and the safety valve 1 c on the upper surface of the battery stack 5, and the circuit holder 28 communicates the gas duct 26 and the like. 27 can be shared, and a plurality of functions for realizing the waterproof structure can be shared, and as a result, the waterproof structure can be easily realized.
(Gas duct 26)

The substrate holder 27 doubles as a gas duct 26 for safely discharging the gas discharged from the safety valve 1 c of the secondary battery cell 1 to the outside. By providing a gas duct 26 in communication with the safety valve 1c of the secondary battery cell 1 inside the substrate holder 27, connecting the gas duct 26 to the safety valve 1c of each secondary battery cell 1, and piping the gas duct 26 to the outside The gas discharged when the internal pressure of the secondary battery cell 1 rises can be discharged to the outside safely. The gas duct is not limited to the structure integrally provided with the substrate holder 27, and it goes without saying that the substrate holder and the gas duct can be provided separately.

Furthermore, the substrate holder 27 is provided with a substrate storage area 27 b for storing the circuit board 28. The circuit board 28 stored in the board storage area 27 b is closed at the top by a shield plate 29 described later.
(Circuit board 28)

A circuit board 28 on which an electronic circuit electrically connected to the secondary battery cell 1 is mounted is provided. The circuit board 28 is a low voltage circuit on which the protection circuit of the battery cell constituting the battery stack 5 is mounted.

The circuit board 28 can be completely waterproofed by coating it with a resin having thermal conductivity. For such a resin, for example, a potting material can be suitably used. Further, by covering with a potting material, the thermal conductivity of the electronic component is enhanced, which is advantageous also in heat radiation. Further, by setting this resin in a state of being thermally coupled to the shield plate 29, the thermal conductivity can be further improved and the heat dissipation can be enhanced.
(Shield plate 29)

Further, the shield plate 29 is placed on the upper surface of the substrate holder 27 to close the substrate storage area 27b. The shield plate 29 is preferably a metal plate having excellent conductivity such as an aluminum plate. Thereby, the disturbance and noise are shielded by the shield plate 29, and the circuit board 28 is electrically shielded to ensure stable operation.

Further, it is preferable to seal the substrate storage area 27 b with the shield plate 29. As a result, by using the shield plate 29 also for sealing the circuit board 28, the physical protection of the circuit board 28 can be achieved simultaneously, and simplification of the configuration and reduction of the member cost can be realized.

In particular, since a metal plate is disposed on the other surface of battery stack 5, an additional member for noise suppression can be provided by limiting the area where shield plate 29 is disposed only to the upper surface of battery stack 5. Cost savings. That is, the lower surface of the battery stack 5 can be covered with a metal plate such as the cooling plate 61, the end surface can be covered with the end plate 3 and the side surface can be covered with the fastening member 4 etc. It can be.

In addition, in the example of FIG. 7, although the board | substrate holder 27 and the holder cover 25 are divided into 2 and the waterproof structure is implement | achieved, these can also be comprised integrally. In this case, the waterproof structure of the upper surface of the battery stack 5 can be realized by fixing the lower surface of the integrated holder cover 25 to the upper surface of the battery stack 5 via a packing or the like.
(Bottom of battery stack 5)

The cooling plate 61 is fixed to the bottom of the battery stack 5 via a heat conductive sheet. 7 to 8 show cross-sectional views of the battery stack 5 provided with the cooling plate 61. FIG. In the battery stack 5, the upper surface is pressed by the holder cover 25 so that the bottom surface is in close contact with the cooling plate 61. By sandwiching the battery stack 5 from above and below in this manner, the top surfaces of the battery cells constituting the battery stack 5 can be arranged on the same plane. In other words, by aligning the bottom surfaces of the battery stacks 5 on the same surface, the connecting surface with the cooling plate 61 can be planar, and the stability and reliability of the thermal coupling can be improved.

As shown in the cross-sectional views of FIGS. 7 to 8, on the bottom surface of the battery stack 5, the lower surface protruding portions 45 of the fastening members 4 protruding from the side edge to the bottom at the corners of the battery stack 5 are located. The lower surface of the battery stack 5 is opened in a region sandwiched by the pair of lower surface projecting portions 45, and the cooling plate 61 is disposed in the opening. The opening is sized to be closed by the cooling plate 61.
(Thermal conduction sheet 12)

In addition, a heat transfer member such as a heat transfer sheet 12 is interposed between the battery stack 5 and the cooling plate 61, as shown in the cross-sectional views of FIGS. The heat conductive sheet 12 is made of an insulating material and excellent in heat conductivity, and more preferably one having a certain degree of elasticity. Examples of such a material include acrylic resins, urethane resins, epoxy resins and silicone resins. By doing this, the battery stack 5 and the cooling plate 61 are electrically isolated. In particular, in the case where the external can of the rectangular battery cell 1 is made of metal and the cooling plate 61 is made of metal, it is necessary to insulate the bottom surface of the rectangular battery cell 1 not to conduct. As described above, while the surface of the outer can is covered and insulated with a heat-shrinkable tube or the like, the insulating heat conductive sheet 12 is interposed to further improve the insulation property, thereby enhancing the safety and reliability. Moreover, it replaces with a heat conductive sheet and a heat conductive paste etc. can also be utilized. Further, an additional insulating film can be interposed to ensure insulation. Also, the cooling pipe can be made of an insulating material. When sufficient insulation is achieved in this manner, the heat conduction sheet or the like may be omitted.

Further, by providing the heat conduction sheet 12 with elasticity, the surface of the heat conduction sheet 12 is elastically deformed so that a gap is eliminated at the contact surface between the battery stack 5 and the cooling plate 61, and the thermally coupled state can be favorably improved.

The positional relationship of each member on the bottom surface of the battery stack 5 is, as shown in the cross-sectional view of FIG. 8, the heat conduction sheet 12 on the bottom surface of the outer can of the secondary battery cell 1 of the overhang portion 2 e of the separator 2. The bent portion 38 b of the waterproof sheet 38 disposed between and attached to the separator 2 is positioned to cover the interface between the projecting portion 2 e of the separator 2 and the heat conductive sheet 12. Thus, the waterproof structure can be realized without fixing the cooling plate 61. At the time of assembly, after the waterproof sheet 28 is attached to the bottom of the battery stack 5 in which the secondary battery cells 1 and the separator 2 are stacked, the heat conductive sheet 12 is disposed, Tighten the body. At this time, it is preferable that the lower surface overhanging portion 45 of the fastening member 4 be extended so as to cover the interface between the overhanging portion 2 e of the separator 2 and the heat conductive sheet 12. As a result, the bent portion 38b of the waterproof sheet 38 and the heat conduction sheet 12 are pressed between the lower surface overhanging portion 45 and the battery stack 5 by the weight of the battery stack 5, and the sealing performance is improved.
(Connected structure)

On the other hand, the battery stack 5 and the cooling plate 61 are provided with a connection structure for fixing the battery stack 5 on the cooling plate 61. In the example shown in FIGS. 2 to 5, in the connection structure, a fastening connection portion 44 provided so as to protrude from the lower end of the main body portion 41 of the fastening member 4 and a plate connection portion provided on the cooling plate 61 side. Configured The plurality of fastening connectors 44 are provided separately from each other. In the example of FIG. 2, the lower end of the main body portion 41 is provided at three positions on both sides and in the middle.
(Locking piece)

In the example of FIGS. 3 to 4, the fastening connection portion 44 is a locking piece whose tip is formed in a hook shape. The hook-like protruding direction of the locking piece is an outward posture from the battery stack 5.
(Plate connection part)

On the other hand, on the cooling plate 61 side, a plate connecting portion is provided as a connecting mechanism for connecting with the fastening connecting portion 44. The plate connection portion is provided at a position corresponding to the position where the fastening connection portion 44 is provided. As such a plate connection part, in the example of FIG. 5, the connection bar 50 in which the locking hole 51 which can lock a locking piece is formed is used. The fastening member 4 can be easily fixed to the cooling plate 61 by inserting a hook-shaped locking piece into the locking hole 51 and locking it.
(Connection bar 50)

As shown in the exploded perspective view of FIG. 5, the connecting bar 50 is formed by bending the strip in a substantially U-shape in cross section. The strip is made of a metal plate so as to exhibit sufficient strength. In the example of FIG. 5, the strength is improved by forming a step on the surface of the strip. The length of the connecting bar 50 is such that the bottom of the cooling plate 61 can be sandwiched by the substantially U-shaped bent portion. A locking hole 51 is opened at the end face of the connecting bar 50 as a plate connecting portion. Thus, by using the connecting bar 50, the plate connecting portion can be easily added to the cooling plate 61. In particular, the coupling mechanism can be added without complicating the shape of the cooling plate 61 having the refrigerant circulation function and the like.
(Refrigerant circulation mechanism)

The cooling plate 61 is provided with a refrigerant circulation mechanism inside. FIG. 9 shows an example of such a refrigerant circulation mechanism. In the assembled battery 10 shown in FIG. 9, the battery stack 5 in which a plurality of secondary battery cells 1 are stacked is disposed on the upper surface of the cooling plate 61. The cooling plate 61 is disposed in a thermally coupled state with the secondary battery cell 1 constituting the battery stack 5. The cooling plate 61 is provided with a refrigerant pipe, and the refrigerant pipe is connected to the cooling mechanism 69. The battery assembly 10 can be cooled directly by bringing the battery stack 5 into contact with the cooling plate 61. Not only the battery stack, but also each member or the like disposed on the end face of the battery stack can be cooled together. As described above, the cooling plate 61 incorporating the cooling pipe 60 for circulating the refrigerant inside is brought into contact with the bottom surface of the battery stack 5 to cool, thereby improving the heat dissipation and stabilizing the power supply device even at high output. It can be made available to
(Cooling plate 61)

The cooling plate 61 is a heat radiating body for thermally conducting the heat of the secondary battery cell 1 to radiate the heat to the outside, and in the example of FIG. 9, a refrigerant pipe is disposed. The cooling plate 61 incorporates, as a heat exchanger, a cooling pipe 60 which is a refrigerant pipe of copper, aluminum or the like for circulating a liquefied refrigerant which is a cooling liquid. The cooling pipe 60 is thermally coupled to the top plate of the cooling plate 61, and a heat insulating material is disposed between the cooling plate 60 and the bottom plate to thermally insulate the bottom plate. Further, the cooling plate 61 may be provided only with a metal plate in addition to a cooling function by such a refrigerant. For example, a metal body provided with a radiation fin or the like has a shape excellent in heat dissipation and heat transfer. Or you may utilize not only metal but the heat-transfer sheet which has insulation.

In the cooling plate 61, the cooling fluid is supplied from the cooling mechanism 69 to the refrigerant piping piped inside, and the cooling plate 61 is cooled. The cooling plate 61 can cool the cooling liquid supplied from the cooling mechanism 69 more efficiently as a refrigerant for cooling the cooling plate 61 by the heat of vaporization generated inside the refrigerant pipe.

In the example of FIG. 9, the two battery stacks 5 are mounted on each cooling plate 61. As described above, two battery stacks 5 are connected in the length direction, that is, the stacking direction of the rectangular battery cells 1 to constitute one battery stack continuum 10B, and two batteries in such a connected state The stacked body 5 is supported by one cooling plate 61. Two battery stacks 10B are arranged in parallel to form a battery pack 10.

Further, in the example of FIG. 9, the cooling plate 61 is extended in the stacking direction of the rectangular battery cells 1, and the cooling pipe 60 piped inside is meandered so as to be folded back at the end edge, thereby forming three straight lines. The cooling pipe 60 is disposed on the lower surface of the battery stack 5. Then, by connecting the cooling pipes 60 to each other by the battery stack continuum 10B, the circulation path of the refrigerant is made common. As described above, when the plurality of battery stacks 5 are placed on one cooling plate 61 and cooled, the cooling mechanism can be shared, and the cooling plate 61 can be shared to make the cost lower and simpler. The mechanism can be realized. However, a plurality of cooling pipes can be disposed on the lower surface of the battery stack, and for example, a serpentine cooling pipe can be divided at a turn-back portion to form a plurality of cooling pipes. Thereby, since the meandering portion can be eliminated, the weight can be reduced. At this time, the cooling pipes may be connected to each other to share the refrigerant path. In addition, the structure and shape which arrange | position a cooling pipe can be changed suitably.

Furthermore, the cooling plate 61 also functions as a heat equalizing unit that equalizes the temperatures of the plurality of secondary battery cells 1. That is, by adjusting the heat energy absorbed by the cooling plate 61 from the secondary battery cell 1, the region where the temperature is lowered by efficiently cooling the secondary battery cell where the temperature is high, for example, the central part secondary battery cell For example, the temperature difference between the secondary battery cells is reduced by reducing the cooling of the secondary battery cells at both ends. As a result, temperature unevenness of the secondary battery cells can be reduced, and deterioration of some of the secondary battery cells can be advanced to avoid overcharging and overdischarging.

In addition, although the example which arrange | positions the cooling plate 61 in the bottom face of the battery laminated body 5 was shown in FIG. 9, it is not restricted to this structure. For example, the cooling plates may be disposed on both sides of the secondary battery cell, or only on the sides. Furthermore, without using a metal plate such as a cooling plate, a cooling pipe through which the internal refrigerant passes can be disposed directly on the lower surface of the battery stack.

Thus, the power supply device 100 according to the first embodiment seals the battery stack 5 to form a waterproof structure, and protects the secondary battery cell 1 from condensation and the like.

Further, in the configuration in which the circuit board is disposed on the upper surface of the battery stack to miniaturize the power supply device, the above-described waterproofing of the electrode terminal 1b, separation of the gas duct 26 and the circuit board 28, and waterproofing of the circuit board 28 are The problem is how to do it. Specifically, since the gas exhausted from the gas duct 26 may adversely affect the circuit board 28, the gas duct 26 and the area for housing the circuit board 28 need to be separated. However, it is not easy to simultaneously achieve the separation of the gas duct 26 and the circuit board 28, the waterproof of the electrode terminal 1b, and the miniaturization of the power supply device 100. On the other hand, as described above, the power supply apparatus 100 according to the first embodiment fixes the holder cover 25 covering the upper surface of the battery stack 5 via the locking hook 31 located outside the electrode terminal 1b, and further holds the holder The substrate holder 27 is watertightly fixed to the upper surface of the cover 25 through the elastic member 30. The substrate holder 27 is fixed to the upper surface of the holder cover 25 to divide the space between the holder cover 25 and the substrate holder 27 into a region where the electrode terminal 1 b is located and a region where the gas duct 26 is formed. Can. A substrate storage area 27 b is formed on the upper surface of the substrate holder 27, and the circuit board 28 can be disposed in a state separated from the gas duct 26. Wiring for connecting the circuit board 28 and the electrode terminal 1 b is configured to be inserted through an opening (not shown) formed in the substrate holder 27. Further, since the circuit board 28 is covered with the resin in a state of being stored in the board storage area 27 b, the circuit board 28 can be completely waterproofed.

As described above, in the above embodiment, the electrode cover 1 b is covered with the simple structure in which the upper surface of the battery stack is covered with the holder cover 26 and the substrate holder 27. Since waterproofing can be achieved, it is also possible to avoid an increase in the size of the power supply device.

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. .
(Power supply for hybrid vehicles)

FIG. 10 shows an example in which the power supply device is mounted on a hybrid vehicle traveling with both an engine and a motor. A vehicle HV equipped with a power supply device shown in this figure includes an engine 96 for traveling the vehicle HV and a motor 93 for traveling, a power supply device 100 for supplying electric power to the motor 93, and a generator for charging the battery of the power supply device 100. And 94. The power supply device 100 is connected to the motor 93 and the generator 94 via a 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 100. 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. The motor 93 is supplied with power from the power supply device 100 and is driven. The generator 94 is driven by the engine 96 or driven by regenerative braking when the vehicle is braked to charge the battery of the power supply device 100.
(Power supply for electric vehicles)

Further, FIG. 11 shows an example in which the power supply device is mounted on an electric vehicle traveling only by a motor. A vehicle EV equipped with a power supply device shown in this figure includes a motor 93 for traveling to drive the vehicle EV, a power supply device 100 for supplying electric power to the motor 93, and a generator 94 for charging the battery of the power supply device 100. And have. The motor 93 is supplied with power from the power supply device 100 and is driven. The generator 94 is driven by energy when regenerative braking the vehicle EV, and charges the battery of the power supply device 100.
(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 100 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 rectangular battery cells 1 are connected in series and / or in parallel. Each battery pack 81 is controlled by a power supply controller 84. The power supply device 100 drives the load LD after charging the battery unit 82 with the charging power supply CP. Therefore, the power supply device 100 has a charge mode and a discharge mode. The load LD and the charging power supply CP are connected to the power supply device 100 through 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 100. In the charge mode, the power supply controller 84 switches the charge switch CS to ON and the discharge switch DS to OFF to permit charging of the power supply device 100 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 100 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 100.

The load LD driven by the power supply device 100 is connected to the power supply device 100 via the discharge switch DS. In the discharge mode of the power supply device 100, 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 100. 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 apparatus 100. The power supply controller 84 also includes a communication interface for communicating with an external device. In the example of FIG. 12, 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. Further, 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.

The power supply device according to the present invention, a vehicle including the same, and a power storage device are suitably used as a power supply device for a plug-in hybrid electric vehicle, a hybrid electric vehicle, an electric vehicle or the like capable of switching between the EV travel mode and the HEV travel mode. it can. 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.

100 power supply device 1 secondary battery cell 1a sealing plate 1b electrode terminal 1c

safety valve

2, 2A separator 2B end face separator 2a flat plate 2b side wall 2c top plate 2d battery Cell storage space 2e: projection part: 2f: projection 3: end plate; 3b: bending part 4: fastening member 5: battery laminated body 6: bus bar 7: laminated body connecting piece; 7b: bending piece 10: assembled battery DESCRIPTION OF SYMBOLS 10B ... Battery lamination continuous body 12 ... Heat conduction sheet 25 ... Holder cover 26 ... Gas duct 27 ... Substrate holder; 27b ... Substrate storage area 28 ... Circuit board 29 ... Shield plate 30 ... Elastic member 31 ... Locking hook 32 ... Pressed part 33 step surface 34 wall surface portion 35 hook receiving portion 38 waterproof sheet 38b bending portion 38c notch 41 main portion 42 bending portion 43 upper surface holding portion 44 fastening connecting portion 45 lower surface Zhang Out portion 50 ... connection bar 51 ... locking hole 60 ... cooling pipe 61 ... cooling plate 69 ... cooling mechanism 70 ... exterior case 71 ... lower case 72 ... upper case 73 ... end surface plate 74 ... ridge portion 81 ... battery pack 82 ... battery Unit 84 Power controller 85 Parallel connection switch 93 Motor 94 Generator 95 DC / AC inverter 96 Engine 201 Battery cell 205 Battery stack 260 Cooling pipe 261 Cooling plate 269 Cooling mechanism EV, HV ... Vehicle LD ... Load; CP ... Power supply for charging; DS ... Discharge switch; CS ... Charge switch OL ... Output line; HT ... Host device DI ... Pack I / O terminal; DA ... Pack abnormal output terminal; DO ... Pack connection terminal

Claims

A battery stack in which a plurality of secondary battery cells having a rectangular outer shape are stacked;
A pair of end plates disposed respectively on both end faces of the battery stack;
A power supply device, further comprising: a fastening member that covers the side surfaces of the battery stack and fixes the end plates to fasten the battery stack.
The waterproof and insulating waterproof sheet is disposed between the fastening member and the side surface of the battery stack and covers the battery cells in a watertight manner,
The said waterproof sheet is provided with elasticity, The power supply device characterized by the above-mentioned.
The power supply device according to claim 1,
The said waterproof sheet provides an adhesive layer in the surface which covers the said battery laminated body, The power supply device characterized by the above-mentioned.
The power supply device according to claim 1 or 2, wherein
The said waterproof sheet is comprised by the sheet shape made of rubber, The power supply device characterized by the above-mentioned.
The power supply device according to any one of claims 1 to 3, wherein
A power supply device characterized in that the end plate covers the end face of the battery stack in a watertight state.
The power supply device according to any one of claims 1 to 4, further comprising:
A circuit board on which an electronic circuit electrically connected to the secondary battery cell is mounted;
A substrate holder for holding the circuit substrate;
A holder cover for holding the lower surface of the substrate holder;
Equipped with
The power supply apparatus according to claim 1, wherein the holder cover is fixed to the upper surface of the battery stack in a watertight state.
The power supply device according to claim 5, wherein
An elastic member is interposed between the substrate holder and the upper surface of the holder cover.
The power supply device according to claim 6, wherein
A power supply apparatus characterized in that the substrate holder is provided with a gas duct in communication with a safety valve for discharging gas inside the secondary battery cell.
The power supply device according to any one of claims 1 to 7, further comprising:
An insulating separator interposed between adjacent secondary battery cells that constitute the battery stack;
Equipped with
A power supply device characterized in that a locking hook for fixing to the substrate holder is provided on the upper part of the separator.
The power supply device according to any one of claims 1 to 8, further comprising:
And a heat conductive sheet covering the bottom of the battery stack,
The waterproof sheet is bent in an L-shape in cross section, and covers the corners of the battery stack continuously from the side surface to the bottom surface of the battery stack with the bent portion.
A power supply device characterized in that the bottom surface of the battery stack is covered with a waterproof sheet so as to overlap with the heat conductive sheet.
The power supply device according to claim 9, further comprising:
A cooling plate, disposed on the bottom side of the battery stack, for performing heat exchange with the battery stack by flowing a refrigerant therein;
Equipped with
A power supply device characterized in that a heat conduction sheet is interposed between the cooling plate and the bottom surface of the battery cell, and they are connected in a thermally coupled state.
A vehicle equipped with the power supply device according to any one of claims 1 to 10.
A power storage device mounted with the power supply device according to any one of claims 1 to 10.