JP5734704B2 - Power supply device and vehicle equipped with power supply device - Google Patents

Power supply device and vehicle equipped with power supply device Download PDF

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JP5734704B2
JP5734704B2 JP2011043347A JP2011043347A JP5734704B2 JP 5734704 B2 JP5734704 B2 JP 5734704B2 JP 2011043347 A JP2011043347 A JP 2011043347A JP 2011043347 A JP2011043347 A JP 2011043347A JP 5734704 B2 JP5734704 B2 JP 5734704B2
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power supply
battery
supply device
plate
cooling plate
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JP2012181972A (en
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康広 浅井
康広 浅井
橋本 裕之
裕之 橋本
貴英 籠谷
貴英 籠谷
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三洋電機株式会社
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Description

  The present invention mainly includes a power source device for a motor for driving a vehicle such as a hybrid vehicle or an electric vehicle, or a large current power source device used for power storage for home use or factory use, and such a power source device. Regarding vehicles.

  There is a demand for a power supply device with high output, such as an assembled battery 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. The battery cell generates heat when charged and discharged with a large current. In particular, the amount of heat generation increases as the number of battery cells used increases. Therefore, there is a need for a heat dissipation mechanism that efficiently conducts and dissipates heat dissipation from battery cells. A power supply device having such a heat dissipation mechanism has been developed (see, for example, Patent Document 1). As shown in FIG. 16, this power supply device is fixed on the cooling plate 103 having a built-in heat exchanger 104 that circulates the refrigerant inside and forcibly cools it with the heat of vaporization of the refrigerant. The battery block 102 to which the plurality of batteries 101 are connected and the frame structure 105 to which the cooling plate 103 is fixed are provided, and the battery block 102 is forcibly cooled by the cooling plate 103.

JP 2009-238389 A JP 2010-123812 A

  As described above, in the configuration in which the refrigerant is circulated inside the cooling plate and forcedly cooled by the heat of vaporization of the refrigerant, the cooling plate and the battery block are heated so that the heat generated by the battery block can be reliably conducted to the cooling plate side. It is important to establish a connection state. However, it is not easy to maintain a fixed state in which the battery block and the cooling plate are reliably brought into contact with each other. In particular, in the conventional power supply device, an end plate is provided on both sides of the end surface of the battery stack in which battery cells are stacked, and a battery block sandwiched by the end plate is configured, and the end plate is fixed to the cooling plate. Has been adopted. In this configuration, since there is no structure for fixing the middle part of the battery block to the cooling plate, the contact state with the cooling plate may be insufficient. In particular, in an environment exposed to vibration or impact, such as an in-vehicle power supply device, it is conceivable that the battery cell in the middle part is lifted by vibration or impact due to external force, and contact with the cooling plate is impaired. As a result, there has been a problem that the cooling capacity by the refrigerant is not sufficiently exhibited, the battery cell is not sufficiently radiated, and the reliability and stability of the power supply device are lowered.

  The present invention has been made to solve such conventional problems. A main object of the present invention is to provide a power supply device that can stably maintain a contact state between a battery stack and a cooling plate and sufficiently exhibit cooling capacity, and a vehicle including the power supply device. .

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, according to the power supply device of the first aspect of the present invention, a battery laminate formed by laminating a plurality of rectangular battery cells, and fastening for fastening the battery laminate on the side face A power supply device comprising: a member; and a cooling plate for placing the battery laminate fastened by the fastening member on an upper surface and conducting heat generated in the battery laminate, wherein the fastening member is , Provided with a fastening connection part for connecting with the cooling plate at a plurality of locations in the middle of the battery stack, and further, the cooling plate has a plate connection part for connecting with the fastening connection part, By connecting the fastening connection part and the plate connection part, the battery stack can be connected to the cooling plate in a thermally coupled state. Accordingly, by connecting the fastening connection portion and the plate connection portion, the battery stack can be connected to the cooling plate at a plurality of locations in the intermediate portion, avoiding lifting of the intermediate portion, and the like. The advantage that heat can be efficiently dissipated is obtained.

  Moreover, according to the power supply device which concerns on a 2nd side surface, the said fastening connection part is provided with the locking piece which formed the front end in hook shape, and the said plate connection part can lock the said locking piece It can be formed in the locking hole. Accordingly, the fastening member can be easily fixed to the cooling plate by inserting the locking piece into the locking hole.

  Furthermore, according to the power supply device according to the third aspect, the locking hole can be formed in the through hole. Thereby, a locking hole can be formed easily.

  Furthermore, the power supply device according to the fourth aspect further comprises a strip-like connecting bar bent in a substantially U shape in cross section, and the second engaging member as the plate connecting portion on the end surface of the connecting bar. A stop hole is opened, and the connection bar is disposed on the bottom surface of the cooling plate, and the second locking hole can be opened on the side surface of the cooling plate. Thereby, a plate connection part can be easily added to a cooling plate, and the advantage that a connection mechanism can be added, without complicating the shape of a cooling plate provided with a refrigerant | coolant circulation function etc. is acquired.

  Furthermore, according to the power supply device which concerns on a 5th side surface, while the said locking hole is opened in the middle of a cooling plate, said 2nd locking hole can be opened in the side surface of a cooling plate. Thereby, in the state which arranged the two battery laminated bodies on the cooling plate, the advantage which can connect two battery laminated bodies with one connection bar is acquired.

  Furthermore, according to the power supply device which concerns on a 6th side surface, the said connection bar can be curved in the direction which protrudes toward the said cooling plate. Thereby, in the state which connected the cooling plate and the battery laminated body with the connection bar, a cooling plate can be pressed to the battery laminated body side by the reaction which presses a curved part, and adhesive force can be exhibited more.

  Furthermore, according to the power supply device according to the seventh aspect, the hook-like protruding direction of the locking piece can be formed inward with respect to the battery stack. As a result, even when a plurality of battery stacks are adjacent to each other, it is possible to avoid the situation where the locking pieces interfere with each other, and the battery stacks can be arranged in close contact with each other, thereby realizing space saving arrangement.

  Furthermore, according to the power supply device which concerns on an 8th side surface, it is further provided with the end plate for pinching the end surface in the longitudinal direction of the said battery laminated body, and the said end plates can be fastened with the said fastening member. Thereby, an electric laminated body can be pinched using an end plate.

  Furthermore, according to the vehicle according to the ninth aspect, any one of the power supply devices described above can be provided.

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 assembled battery of FIG. It is the perspective view which looked at FIG. 2 from diagonally downward. FIG. 5 is an exploded perspective view of FIG. 4. It is a disassembled perspective view which shows a mode that the assembled battery of FIG. 2 is fixed to a cooling plate. It is sectional drawing which shows a mode that the assembled battery of FIG. 6 is fixed to a cooling plate. It is sectional drawing which shows a mode that the assembled battery of FIG. 7 was fixed to the cooling plate. It is an expanded sectional view which shows the fixing | fixed part of FIG. It is a schematic cross section which shows the structure at the time of providing a through-hole in the right and left of a cooling plate. It is sectional drawing which shows the cooling plate which concerns on a modification. It is a schematic diagram which shows a refrigerant | coolant circulation mechanism. It is a block diagram which shows the example which mounts a power supply device in the hybrid vehicle which drive | works 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 with a motor. It is a block diagram which shows the example applied to the power supply device for electrical storage. It is a disassembled perspective view which shows the conventional power supply device. It is a perspective view which shows the cooling plate which concerns on another modification. It is a model bottom view which shows the structure which connects only the both ends of a battery laminated body. FIG. 19A is an exploded cross-sectional view showing a state where the cooling plate and the battery stack are connected using the connection bar according to the modification, and FIG. 19B shows the state connected in FIG. 19A. It is a schematic cross section.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a power supply device for embodying the technical idea of the present invention and a vehicle including the power supply device, and the present invention includes the following power supply device and a vehicle including the power supply device. Not specified. Moreover, the member shown by the claim is not what specifies the member of 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 only to the description unless otherwise specified. 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 clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

Based on FIGS. 1-12, the example applied to the vehicle-mounted power supply device 100 as the power supply device 100 which concerns on Example 1 is demonstrated. The power supply apparatus 100 shown in these drawings is most suitable for the power source of an electric vehicle such as a hybrid vehicle that travels by both an engine and a motor and an electric vehicle that travels by only a motor. However, the power supply device of the present invention can be used for 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)

As shown in the exploded perspective view of FIG. 1, the external appearance of the power supply device 100 is a box shape whose upper surface is rectangular. In the power supply device 100, a box-shaped outer case 70 is divided into two, and a plurality of assembled batteries 10 are accommodated therein. The exterior case 70 includes a lower case 71, an upper case 72, and end plates 73 connected to both ends of the lower case 71 and the upper case 72. The upper case 72 and the lower case 71 have a flange portion 74 protruding outward, and the flange portion 74 is fixed with a bolt and a nut. The outer case 70 has a flange 74 disposed on the side surface of the outer case 70. Moreover, in the example shown in FIG. 1, the assembled battery 10 is accommodated in the lower case 71 in total, two in the longitudinal direction and two in the lateral direction. In the example shown in FIG. 2 and the like, the side surfaces are connected by fastening members in a state where two assembled batteries 10 are arranged in the stacking direction. Each assembled battery 10 is fixed at a fixed position inside the outer case 70. The end surface plate 73 is connected to both ends of the lower case 71 and the upper case 72 and closes both ends of the exterior case 70.
(Battery 10)

As shown in FIGS. 2 to 6, the assembled battery 10 includes a plurality of prismatic battery cells 1, and a separator 2 that interposes the plurality of prismatic battery cells 1 on a surface where the plurality of prismatic battery cells 1 are stacked to insulate the prismatic battery cells 1. A pair of end plates 3 disposed on the end surface in the stacking direction of the battery stack 5 in which the plurality of prismatic battery cells 1 and separators 2 are alternately stacked, and the end plates 3 are fastened to each other at both end surfaces of the battery stack 5. And a plurality of metal fastening members 4. Further, the battery stack 5 is fixed on a cooling plate 60 for cooling it. The cooling plate 60 is a member that conducts heat generated in the battery stack 5 and dissipates it, and circulates a refrigerant inside the cooling plate 60 (details will be described later). Further, by forming the cooling plate 60 larger than the battery stack 5, the plurality of battery stacks 5 can be placed on the single cooling plate 60 and cooled. In the example of FIGS. 4 to 6 and the like, two battery stacks 5 are placed in parallel on each cooling plate 60. As described above, the battery stack 5 has two battery stacks 5 connected in series in the length direction, and the two battery stacks in such a connected state are supported by the two cooling plates 60. ing. However, the present invention is not limited to this example. For example, all four battery stacks can be mounted on a single cooling plate, and the cooling plate can be shared. Or it is good also as a structure which prepares the cooling plate of the substantially same magnitude | size as the bottom face of a battery laminated body, and cools each battery laminated body 5 separately with a cooling plate.
(Battery laminate 5)

  The assembled battery 10 includes a plurality of rectangular battery cells 1 stacked via an insulating separator 2 to form a battery stack 5, and a pair of end plates 3 disposed on both end faces of the battery stack 5. These end plates 3 are connected by a fastening member 4. The assembled battery 10 shown in the above figure is formed by alternately laminating a plurality of prismatic battery cells 1 and separators 2 by interposing separators 2 that insulate the adjacent prismatic battery cells 1 on the lamination surface of the prismatic battery cells 1. The battery stack 5 is obtained.

In the assembled battery, it is not always necessary to interpose a separator between the square battery cells. For example, by forming rectangular battery cell outer cans with an insulating material, or by insulating the rectangular battery cells adjacent to each other by a method such as covering the outer periphery of the rectangular battery cell outer can with an insulating sheet or insulating paint. A separator can be dispensed with. In particular, a method of cooling the battery stack through a cooling plate cooled by using a refrigerant or the like is employed, instead of an air cooling method in which cooling air is forced between the rectangular battery cells to cool the rectangular battery cells. In the configuration, it is not always necessary to interpose a separator between the rectangular battery cells.
(Square battery cell 1)

  In the rectangular battery cell 1, the outer can constituting the outer shape thereof is a rectangular shape having a thickness smaller than a width. Positive and negative electrode terminals are provided on the sealing plate for closing the outer can, and a safety valve is provided between the electrode terminals. The safety valve is configured to open when the internal pressure of the outer can rises to a predetermined value or more, and to release the internal gas. The increase in the internal pressure of the outer can can be stopped by opening the safety valve. The unit cell constituting the rectangular battery cell 1 is a rechargeable secondary battery such as a lithium ion battery, a nickel-hydrogen battery, or a nickel-cadmium battery. In particular, when a lithium ion battery is used for the prismatic battery cell 1, there is an advantage that the charge capacity with respect to the volume and mass of the whole battery pack can be increased.

The rectangular battery cell 1 is a quadrangle having a predetermined thickness, positive and negative electrode terminals projecting from both ends of the upper surface, and an opening of a safety valve is provided at the center of the upper surface. The stacked rectangular battery cells 1 are connected in series by connecting adjacent positive and negative electrode terminals with a bus bar 6. The assembled battery 10 in which the adjacent rectangular battery cells 1 are connected in series can increase the output voltage and increase the output. However, the battery pack can also connect adjacent rectangular battery cells in parallel. The rectangular battery cell 1 is manufactured with a metal outer can. In this rectangular battery cell 11, an insulating separator 2 is sandwiched in order to prevent a short of an outer can of the adjacent rectangular battery cell 1. Note that the outer can of the rectangular battery cell can also be made of an insulating material such as plastic. In this case, the prismatic battery cell does not need to be laminated by insulating the outer can, so that the separator can be made of metal.
(Separator 2)

The separator 2 is a spacer for laminating adjacent rectangular battery cells 1 electrically and thermally. The separator 2 is made of an insulating material such as plastic, and is disposed between the adjacent rectangular battery cells 1 to insulate the adjacent rectangular battery cells 1.
(End plate 3)

  A pair of end plates 3 are arranged on both end faces of the battery stack 5 in which the rectangular battery cells 1 and the separators 2 are alternately stacked, and the battery stack 5 is fastened by the pair of end plates 3. The end plate 3 is made of a material that exhibits sufficient strength, for example, metal. The end plate 3 has a fixing structure for fixing to the lower case 71 shown in FIG. In this example, a case fixing portion 3a protruding from the lower end of the end plate 3 is provided and fixed to the lower case 71 by screwing or the like. As shown in FIG. 4 and the like, the case fixing portion 3a is protruded from the end surface of the cooling plate 60 on the bottom surface of the assembled battery 10, and the lower case 71 and the end plate 3 are fixed in this state, whereby the cooling plate 60 Is fixed between the battery stack 5 and the lower case 71 so as to be sandwiched from above and below.

Further, it is possible to provide a structure for fixing the end plate on the cooling plate side. In the modification shown in FIG. 17, the cooling plate 60D is constituted by a single piece, and the fixing hole 3b for inserting the case fixing portion 3a of the end plate 3 is formed in the cooling plate 60D. Thereby, case fixing part 3a can be press-fitted into fixing hole 3b, and battery stack 5 can be fixed to cooling plate 60D via end plate 3.
(Fastening member 4)

As shown in FIGS. 2 to 6, the fastening members 4 are arranged on both side surfaces of the battery stack 5 in which the end plates 3 are stacked at both ends, and are fixed to the pair of end plates 3 to fix the battery stack 5. Conclude. As shown in the perspective view of FIG. 3, the fastening member 4 includes a main body 41 that covers the side surface of the battery stack 5, and a bent piece 42 that is bent at both ends of the main body 41 and fixed to the end plate 3. And an upper surface holding portion 43 that is bent upward to hold the upper surface of the battery stack 5 and a fastening connecting portion 44 that protrudes downward. Such a fastening member 4 is made of a material having sufficient strength, for example, metal. In the example shown in FIG. 2 and the like, both side surfaces are integrally connected by the fastening members 4 in a state where the two battery stacks 5 are arranged in the stacking direction as described above. In this configuration, the fastening member 4 is also used as a member for connecting the battery stacks 5 to each other. Here, the end plates 3 positioned on the end surfaces are fixed to each other by the fastening members 4, and the fastening members are not fixed to the end plates 3 facing each other between the two battery stacks 5. In addition, a fastening member can also be provided for each battery stack, and in this case, end plates positioned at the respective end surfaces are fixed to each battery stack by a fastening member.
(Folded piece 42)

The bent piece 42 covers the end plate 3 from the side surface to the back surface, and presses the end plate 3 so as not to expand in the stacking direction of the battery stack 5. Here, as shown in the exploded perspective view of FIG. 3, screw holes are opened on the upper and lower sides of the bent piece 42, and further, screw holes are also opened on the end plate 3 side, so that the fastening member 4 is fixed by screwing. It is fixed to the plate 3.
(Upper surface holding part 43)

As shown in the exploded perspective view of FIG. 3 and the cross-sectional views of FIGS. 7 and 8, the upper surface holding part 43 bends the upper surface of the main body part 41 into an L shape and locks the upper surface of the prismatic battery cell. As a result, the prismatic battery cell 1 can be prevented from being lifted, and the state where the battery stack 5 is pressed toward the cooling plate 60 can be maintained, which contributes to the maintenance of the thermal coupling state. Moreover, in order to receive such an upper surface holding part 43, when not using the separator 2 which clamps or covers the rectangular battery cell 1, or when the separator is not used, the upper surface holding part 43 is directly engaged with the rectangular battery cell 1. A step surface is provided.
(Main body 41)

  Further, the main body 41 includes a bind bar main body 41a passed substantially vertically as shown in FIG. 3 and a plurality of connecting bodies 41b crossed so as to connect the two bind bar main bodies 41a. Consists of. As a result, the body portion 41 is provided with a plurality of partial openings. Thus, by providing a plurality of openings and exposing the battery stack 5, the battery stack 5 can be exposed to the outside air to easily dissipate heat.

Further, an air cooling mechanism for cooling the rectangular battery cells by forcibly sending the cooling air between the rectangular battery cells from the opening may be added. In this case, the separator is provided with a blast gap for allowing a cooling gas such as air to pass between the separator and the rectangular battery cell 1. For example, a groove extending to both side edges is provided on the surface of the separator facing the square battery cell, and a ventilation gap is provided between the separator and the square battery cell. In addition, by providing grooves on both sides of the separator, it is possible to provide a ventilation gap between the rectangular battery cells and the separator that are adjacent to each other. In this way, by combining cooling by refrigerant and cooling by air cooling, which will be described later, the prismatic battery cell can be efficiently cooled while effectively preventing thermal runaway of the prismatic battery cell, and one of the cooling functions is insufficient. It can also be used as a backup when it does not function. However, it goes without saying that such a configuration that does not employ air cooling may be adopted.
(Fastening connection part 44)

As described above, the fastening member 4 is fixed to the end plate 3 by the bent pieces 42 provided at both ends of the main body 41. The battery stack 5 is fixed to the cooling plate 60 by the end plate 3. However, with this alone, it is a structure that is fixed to the cooling plate at both ends of the battery stack, and in order to maintain the middle part of the battery stack in sufficient thermal coupling with the cooling plate, especially in-vehicle In an environment exposed to vibration and impact, such as usage, the reliability was insufficient. Therefore, in addition to the structure in which the upper surface holding portion is pressed from the upper surface of the battery stack, a structure in which the intermediate portion of the battery stack is directly connected to the cooling plate is added, so that the contact state is more reliably exhibited and the reliability is improved. Can be improved. As such a connection structure, the fastening connection portion 44 is provided in the middle of the main body portion 41. As shown in FIGS. 5, 6, and the like, it is preferable that a plurality of fastening connecting portions 44 be provided apart from each other. In the present invention, of the two bind bar main bodies 41a, the fastening connection portion 44 is provided in the main body portion 41a on the side close to the cooling plate, but the fastening connection portion 44 is provided on the main body portion 41a on the side far from the cooling plate. The location where the fastening connection portion 44 is provided is not particularly limited.
(Locking piece 45)

In the example of FIG. 6 or the like, the fastening connection portion 44 is a locking piece 45 having a tip formed in a hook shape. As shown in FIGS. 8, 9, etc., the locking piece 45 is preferably formed so that the hook-like protruding direction is inward with respect to the battery stack 5. Thereby, since it does not protrude outward from the battery laminated body 5, even if battery laminated bodies 5 are made to adjoin, the adjacent saddle shape does not mutually interfere. Therefore, the battery stacks 5 can be arranged close to each other, the battery stacks 5 can be efficiently arranged on the cooling plate 60, and an increase in size can be avoided.
(Plate connecting part)

  On the other hand, on the cooling plate 60 side, a plate connecting portion is provided as a connecting mechanism for connecting to the fastening connecting portion 44. The plate connecting portion is provided at a position corresponding to the position where the fastening connecting portion 44 is provided. As such a plate coupling portion, for example, a locking hole 46 capable of locking the locking piece 45 is formed. Accordingly, the fastening member 4 can be easily fixed to the cooling plate 60 by inserting and locking the hook-shaped locking pieces 45 into the locking holes 46.

  In the example of FIG. 6, two battery stacks 5 are fixed side by side on one cooling plate 60 as described above. Each battery stack 5 is provided with locking pieces 45 on the left and right side surfaces. For this reason, the locking hole 46 is formed as a through hole on the center side of the cooling plate 60. In the example shown in the cross-sectional views of FIGS. 7 and 8, the locking pieces 45 of the respective fastening members 4 are formed inward from each other, so that one locking hole 46 is shared by two adjacent battery stacks 5. it can. That is, two locking pieces 45 are inserted into one locking hole 46 and are locked on the left and right of the locking hole 46, respectively.

On the other hand, on the side surface of the cooling plate, if a through-hole is to be formed in the cooling plate, the cooling plate 60B becomes larger by that amount as shown in FIG. Protruding. On the other hand, if it is going to suppress such protrusion, there exists a possibility that the intensity | strength of the part which forms a locking hole may become inadequate. Therefore, in the example shown in FIG. 6 and the like, the second locking hole 52 is added using a connecting bar 50 which is a separate member.
(Connection bar 50)

  As shown in the exploded perspective view of FIG. 3 etc., the connection bar 50 is made into the shape which bent the strip at the cross-sectional view substantially U shape. The strip strip is made of a metal plate so as to exhibit sufficient strength. In the example of FIG. 1, the strength is improved by forming a step on the surface of the strip strip. The length of the connecting bar 50 is set such that the bottom surface of the cooling plate can be sandwiched between the substantially U-shaped bent portions. A second locking hole 52 is opened at the end face of the connecting bar 50 as a plate connecting portion. In the example of FIG. 6 and the like, since the two battery stacks 5 are fixed side by side, the locking piece 45 located on the cooling plate end surface side of each battery stack 5 is locked with the second locking hole 52. In addition, the locking piece 45 positioned on the side where the battery stacks 5 are adjacent to each other is locked with a locking hole 46 opened in the center of the cooling plate. Further, a locking hole 51 is opened at a position corresponding to the locking hole 46 of the strip strip so that the locking hole 46 is not blocked by the connecting bar. In this way, the plate connecting portion can be easily added to the cooling plate by using the connecting bar 50. In particular, a coupling mechanism can be added without complicating the shape of a cooling plate having a refrigerant circulation function or the like.

Moreover, the said structure is an example, for example, in the structure which provides a cooling plate in each battery laminated body, as shown in FIG. 11, the securing piece 45 can be fixed only by the 2nd securing hole 52 of the connection bar 50. As shown in FIG. With this configuration, there is no need to provide a locking hole in the cooling plate 60C, so that an advantage of simplifying the configuration of the cooling plate can be obtained.
(Modification of connecting bar)

Furthermore, a structure for stably connecting the battery stack to the cooling plate can be added to the connection bar. According to the structure in which the fastening connecting portion 44 is locked to the locking hole 51 and the second locking hole 52, as shown in FIG. 18, in the portion provided with such a connecting structure, that is, on both sides of the battery stack. Although the contact between the battery stack and the cooling plate is exerted, the intermediate portion of the battery stack (the area surrounded by the hatched area in FIG. 18) has no connection structure, and therefore receives contact due to external forces such as vibration and impact. The state may become unstable. Therefore, a more stable contact state can be maintained by adding a mechanism for pressing the intermediate portion of the battery stack to the cooling plate side to the connection bar. Such an example is shown in the cross-sectional views of FIGS. 19 (a) and 19 (b). In the connecting bar 50B shown in this figure, a region sandwiched at the position where the locking hole 51 and the second locking hole 52 are provided is curved so that an intermediate portion protrudes in a cross-sectional view. By configuring the connecting bar with an elastic member such as a metal plate, when the curved chevron is pressed and deformed by the cooling plate 60, a repulsive force acts and a force that pushes back the cooling plate 60 acts. In FIG. 19A, since the locking hole 51 is provided in the middle of the connecting bar 50B, the connecting bar 50B is curved on the left and right sides of the locking hole 51 to form two chevron shapes. Thus, by locking the locking pieces 45 in the locking holes 51 and the second locking holes 52, the portions curved in a mountain shape push up the cooling plate, and the middle part of the battery stack 5 becomes the cooling plate. Pressed. As a result, the adhesion between the battery stack and the cooling plate is enhanced, the thermal conductivity is exhibited, and the reliability by cooling is improved.
(Refrigerant circulation mechanism)

The cooling plate is provided with a refrigerant circulation mechanism therein. FIG. 12 shows an example of such a refrigerant circulation mechanism. In the battery pack 10 shown in FIG. 12, the battery stack 5 in which a plurality of rectangular battery cells 1 are stacked is arranged on the upper surface of the cooling plate 60. The cooling plate 60 is disposed in a thermally coupled state to the rectangular battery cells 1 constituting the battery stack 5. The cooling plate 60 is provided with a refrigerant pipe 61, and the refrigerant pipe 61 is connected to a cooling mechanism 69. The assembled battery 10 can be effectively cooled directly by bringing the battery stack 5 into contact with the cooling plate 60. In addition to the battery stack, for example, each member disposed on the end face of the battery stack can also be cooled together (cooling plate 60).

  The cooling plate 60 is a heat radiating body for conducting heat of the rectangular battery cell 1 to dissipate it to the outside, and in the example shown in the figure, a refrigerant pipe 61 is provided. The cooling plate 60 incorporates a cooling pipe of a refrigerant pipe 61 such as copper or aluminum that circulates a liquefied refrigerant that is a cooling liquid as a heat exchanger. Although not shown, the cooling pipe is thermally coupled to the top plate of the cooling plate 60, and a heat insulating material is disposed between the bottom plate and the bottom plate to insulate the cooling pipe. Further, in addition to the cooling function by the refrigerant, the cooling plate 60 can be composed of only a metal plate. For example, it is made into the shape excellent in heat dissipation and heat transfer property, such as a metal body provided with a radiation fin. Or you may utilize not only metal but the heat-transfer sheet | seat which has insulation.

  The cooling plate 60 is cooled by supplying a cooling liquid from a cooling mechanism 69 to a refrigerant pipe 61 piped inside. The cooling plate 60 can cool the cooling liquid supplied from the cooling mechanism 69 more efficiently as a refrigerant that cools the cooling plate 60 with heat of vaporization that evaporates inside the refrigerant pipe 61.

  Further, the cooling plate 60 also functions as a soaking means for equalizing the temperatures of the plurality of rectangular battery cells 1. That is, by adjusting the thermal energy absorbed by the cooling plate 60 from the rectangular battery cell 1, the rectangular battery cell whose temperature is increased, for example, the rectangular battery cell in the central portion is efficiently cooled to decrease the temperature, for example, both ends. The cooling of the rectangular battery cells is reduced, and the temperature difference between the rectangular battery cells is reduced. As a result, the temperature unevenness of the prismatic battery cells can be reduced, and a situation in which some of the prismatic battery cells are deteriorated and overcharge and overdischarge can be avoided.

  In addition, although the example which arrange | positions the cooling plate 60 in the bottom face of the battery laminated body 5 was shown in FIG. 12, it is not restricted to this structure. For example, the cooling plate can be disposed on the side surface of the battery cell.

The above power supply apparatus 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 a plug-in hybrid vehicle that runs with both an engine and a motor, or an electric vehicle that runs only with a motor can be used, and it is used as a power source for these vehicles. .
(Power supply for hybrid vehicles)

FIG. 13 shows an example in which a power supply device is mounted on a hybrid vehicle that runs with both an engine and a motor. A vehicle HV equipped with the power supply device shown in this figure includes an engine 96 and a travel motor 93 that travel the vehicle HV, a power supply device 100 that supplies power to the motor 93, and a generator that charges a battery of the power supply device 100. 94. The power supply apparatus 100 is connected to a motor 93 and a generator 94 via a DC / AC inverter 95. The vehicle HV travels by both the motor 93 and the engine 96 while charging / discharging the battery of the power supply device 100. The motor 93 is driven to drive the vehicle when the engine efficiency is low, for example, during acceleration or low-speed driving. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by the engine 96 or is driven by regenerative braking when the vehicle is braked to charge the battery of the power supply device 100.
(Power supply for electric vehicles)

FIG. 14 shows an example in which a power supply device is mounted on an electric vehicle that runs only with a motor. A vehicle EV equipped with the power supply device shown in this figure includes a traveling motor 93 for traveling the vehicle EV, a power supply device 100 that supplies power to the motor 93, and a generator 94 that charges a battery of the power supply device 100. And. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by energy when regeneratively braking the vehicle EV and charges the battery of the power supply device 100.
(Power storage device for power storage)

  Furthermore, this power supply apparatus can be used not only as a power source for a moving body but also as a stationary power storage facility. For example, as a power source for home and factory use, a power supply system that is charged with sunlight or midnight power and discharged when necessary, or a streetlight power supply that charges sunlight during the day and discharges at night, or during a power outage It can also be used as a backup power source for driving signals. Such an example is shown in FIG. The power supply apparatus 100 shown in this figure forms a battery unit 82 by connecting a plurality of battery packs 81 in a unit shape. Each battery pack 81 has a plurality of battery cells connected in series and / or in parallel. Each battery pack 81 is controlled by a power controller 84. The power supply apparatus 100 drives the load LD after charging the battery unit 82 with the charging power supply CP. For this reason, the power supply apparatus 100 includes a charging mode and a discharging mode. The load LD and the charging power source CP are connected to the power supply device 100 via the discharging switch DS and the charging switch CS, respectively. ON / OFF of the discharge switch DS and the charge switch CS is switched by the power supply controller 84 of the power supply apparatus 100. In the charging mode, the power supply controller 84 switches the charging switch CS to ON and the discharging switch DS to OFF to permit charging from the charging power supply CP to the power supply apparatus 100. Further, when the charging is completed and the battery is fully charged, or in response to a request from the load LD in a state where a capacity of a predetermined value or more is charged, the power controller 84 turns off the charging switch CS and turns on the discharging switch DS to discharge. The mode is switched to permit discharge from the power supply apparatus 100 to the load LD. Further, if necessary, the charge switch CS can be turned on and the discharge switch DS can be turned on to supply power to the load LD and charge the power supply device 100 at the same time.

  A load LD driven by the power supply apparatus 100 is connected to the power supply apparatus 100 via a discharge switch DS. In the discharge mode of the power supply apparatus 100, the power supply controller 84 switches the discharge switch DS to ON, connects to the load LD, and drives the load LD with the power from the power supply apparatus 100. As the discharge switch DS, a switching element such as an FET can be used. ON / OFF of the discharge switch DS is controlled by the power supply controller 84 of the power supply apparatus 100. The power controller 84 also includes a communication interface for communicating with external devices. In the example of FIG. 15, it is connected to the host device HT according to an existing communication protocol such as UART or RS-232C. Further, if necessary, a user interface for the user to operate the power supply system can be provided.

  Each battery pack 81 includes a signal terminal and a power supply 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 signals from other pack batteries and the power supply controller 84, and the pack connection terminal DO is for inputting / outputting signals to / from other pack batteries which are child packs. Terminal. 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 power supply device 100 includes an equalization mode for equalizing the battery units 82. The battery units 82 are connected to the output line OL via the parallel connection switch 85 and connected in parallel to each other. For this purpose, an equalizing circuit 86 controlled by the power supply controller 84 is provided. The equalization circuit 86 suppresses variations in the remaining battery capacity among the plurality of battery units 82.

  The power supply device according to the present invention and the vehicle including the power supply device can be suitably used as a power supply device for a plug-in hybrid electric vehicle, a hybrid electric vehicle, an electric vehicle, or the like that can switch between the EV traveling mode and the HEV traveling mode. Also, a backup power supply device that can be mounted on a rack of a computer server, a backup power supply device for a wireless base station such as a mobile phone, a power storage device for home use and a factory, a power supply for a street light, etc. Also, it can be used as appropriate for applications such as a backup power source such as a traffic light.

DESCRIPTION OF SYMBOLS 100 ... Power supply device 1 ... Square battery cell 2 ... Separator 3 ... End plate; 3a ... Case fixing | fixed part; 3b ... Fixing hole 4 ... Fastening member 5 ... Battery laminated body 6 ... Bus bar 10 ... Battery assembly 41 ... Main-body part; Bind bar main body; 41b ... connecting body 42 ... bending piece 43 ... upper surface holding portion 44 ... fastening connecting portion 45 ... locking piece 46 ... locking holes 50, 50B ... connecting bar 51 ... locking hole 52 ... second locking Holes 60, 60B, 60C, 60D ... Cooling plate 61 ... Refrigerant piping 69 ... Cooling mechanism 70 ... Exterior case 71 ... Lower case 72 ... Upper case 73 ... End plate 74 ... Hook 81 ... Battery pack 82 ... Battery unit 84 ... Power supply Controller 85 ... Parallel connection switch 86 ... Equalization circuit 93 ... Motor 94 ... Generator 95 ... DC / AC inverter 96 ... Engine 101 ... Battery; 102 ... Battery block; 103 ... Cold 104 ... Heat exchanger; 105 ... Frame structure t ... Width; EV, HV ... Vehicle LD ... Load; CP ... Power supply for charging; DS ... Discharge switch; CS ... Charge switch OL ... Output line; DI ... Pack input / output terminal; DA ... Pack abnormal output terminal; DO ... Pack connection terminal

Claims (8)

  1. A battery laminate formed by laminating a plurality of rectangular battery cells;
    A fastening member for fastening the battery stack on the side surface;
    A battery plate that is mounted on the upper surface of the battery laminate fastened by the fastening member, and a cooling plate for conducting heat generated in the battery laminate,
    The fastening member includes fastening connection portions for connecting to the cooling plate at a plurality of locations in the middle of the battery stack,
    Furthermore, the cooling plate includes a plate connecting portion for connecting with the fastening connecting portion,
    The fastening connection portion and the plate connection portion are connected, and the battery stack and the cooling plate are connected in a thermally coupled state,
    The rectangular battery cell is
    An outer can,
    A sealing plate for closing the opening of the outer can;
    A positive electrode terminal and a negative electrode terminal provided on the sealing plate,
    The positive electrode terminal and the negative electrode terminal of each of the rectangular battery cells are arranged on the upper surface of the battery stack,
    A pair of end plates are disposed at both ends in the stacking direction of the rectangular battery cells of the battery stack,
    The fastening member is a power supply device that couples the pair of end plates so that the pair of end plates sandwich the battery stack from both sides .
  2. The power supply device according to claim 1,
    The fastening member includes a main body disposed on a side surface of the battery stack,
    A bent piece that is bent at both ends of the main body and fixed to the end plate,
    The said bending piece is a power supply device arrange | positioned in the outer surface in the lamination direction of the said square battery cell of the said end plate .
  3. The power supply device according to claim 2,
    The upper surface of the fastening member is bent at the upper end of the main body to hold the upper surface of the battery stack.
    A power supply device including a holding unit .
  4. The power supply device according to any one of claims 1 to 3,
    The fastening member is Ri metal der,
    The power supply device , wherein the fastening member is screwed to the end plate .
  5. The power supply device according to any one of claims 1 to 4,
    The fastening connecting portion includes a locking piece having a hook-shaped tip.
    The power supply apparatus, wherein the plate connecting portion is formed in a locking hole capable of locking the locking piece.
  6. The power supply device according to claim 5,
    The power supply device, wherein the locking hole is formed in a through hole.
  7. The power supply device according to claim 5 or 6,
    A power supply device, wherein a hook-like protruding direction of the locking piece is formed inward with respect to the battery stack.
  8. A vehicle comprising the power supply device according to any one of claims 1 to 7.
JP2011043347A 2011-02-28 2011-02-28 Power supply device and vehicle equipped with power supply device Active JP5734704B2 (en)

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