JP2008159439A - Power storage module - Google Patents

Abstract

A battery module having excellent battery cell cooling performance is provided.
A battery module includes a battery cell, a battery holder for holding the battery cell, and a flow path through which cooling air for cooling the battery cell flows. Battery cell 33 and battery holder 1 are stacked in the direction indicated by arrow 89. The flow path is formed so that the cooling air flows in a direction perpendicular to the stacking direction when viewed in plan. The flow path is configured by a space sandwiched between the ribs 21 of the battery holder 1. The rib 21 is formed so that the height in the vertical direction gradually decreases along the flow of the cooling air.
[Selection] Figure 2

Description

  The present invention relates to a power storage module.

  In recent years, electric vehicles using an electric motor as a drive source, and hybrid vehicles combining an electric motor as a drive source and other drive sources (for example, an internal combustion engine, a fuel cell, etc.) have been put into practical use. These automobiles are equipped with power storage devices for supplying electricity as energy to the electric motor. As the power storage device, for example, a secondary battery or a capacitor that can be repeatedly charged and discharged is arranged. As the secondary battery, a battery cell such as a nickel-cadmium battery, a nickel-hydrogen battery, or a lithium ion battery is used.

  A power storage device such as a secondary battery generates heat and increases in temperature due to an electrochemical reaction inside each battery cell. Since the power generation efficiency decreases as the temperature rises, for example, cooling air is introduced from the outside into a case housing the power storage device to cool the battery cells. As described above, some power storage devices are provided with devices such as a fan and a duct for introducing cooling air into the power storage device so as to control the temperature of the power storage device.

  In Japanese Patent Application Laid-Open No. 2006-24445, a plurality of battery batteries, a restraint plate, a restraint rod that restrains the distance between the plates of the restraint plate, and a plurality of stacked battery batteries and restraint plates are disclosed. An assembled battery including a plurality of spacers arranged in the gap is disclosed.

  In Japanese Patent Application Laid-Open No. 2003-258471, a blower having a plurality of plate-like fins extending in the traveling direction of the vehicle and blowing air so as to increase the amount of air flowing between the plate-like fins of the traveling wind generated by the traveling of the vehicle. A cooling device for a moving body provided with the above is disclosed.

In JP 2006-260967 A, a battery module including a battery cell group in which a lithium ion battery is sandwiched between a first frame body, a terminal frame body, and a second frame body, and the battery cell group is laminated. Is disclosed.
JP 2006-24445 A JP 2003-258471 A JP 2006-260967 A

  Some power storage devices include a plurality of power storage cells and a power storage module in which the power storage cells are stacked. In this power storage device, for example, a frame member is disposed between the power storage cells. The flow path is configured so that air flows in the space between the power storage cell and the frame member, and the power storage cell is cooled by the air flowing through the flow path.

  When foreign matter such as dust or dust is contained in the air introduced into the power storage device, the foreign matter may stop in the middle of the flow path, and the cross-sectional area of the flow path may be reduced. Or a part of flow path may be obstruct | occluded. As a result, there is a problem that the cooling performance may be deteriorated.

  In the case where the cooling of the storage cell is insufficient, for example, the temperature of the storage cell rises. There is a possibility that a restriction is imposed on the electrical output of the power storage device due to the temperature rise of the power storage cell. For this reason, there existed a problem that it might become impossible to fully demonstrate the performance of an electrical storage apparatus. When the electrical output of the power storage device is limited, there is a problem that, for example, the acceleration performance of the vehicle may be affected. Alternatively, when the cross-sectional area of air for cooling is increased, there is a problem that the power storage device is increased in size.

  An object of this invention is to provide the electrical storage module which has the cooling performance of the outstanding electrical storage cell.

  The power storage module according to the present invention includes a power storage cell. A frame member for holding the electricity storage cell is provided. A flow path through which a fluid for cooling the electricity storage cell flows is provided. The power storage cell and the frame member are stacked in one direction. The flow path is formed so that the fluid flows in a direction perpendicular to the one direction when viewed in plan. The flow path is constituted by the frame member. At least a part of the flow path is formed so that the height in the vertical direction gradually decreases along the flow of the fluid.

  In the above invention, preferably, the frame member has a plate-like portion formed in a plate shape. It has the 1st convex part currently formed in the surface facing the said electrical storage cell of the said plate-shaped part. The first convex portion is formed so as to contact the power storage cell. The first convex portion is formed to extend linearly. The flow path is configured by a space between the first convex portions.

  Preferably, in the above invention, the first convex portion is formed so as to extend linearly.

  Preferably, in the above invention, the first convex portion is formed such that an angle formed between the extending direction and the horizontal direction is greater than 0 ° and equal to or less than 10 °.

  Preferably, in the above invention, between the frame members facing each other, a plurality of the storage cells are arranged in a direction perpendicular to the one direction when viewed in plan. The first convex portion is formed so as to correspond to each region where the storage cell is disposed.

  In the above invention, preferably, the frame member includes a second convex portion formed on a surface of the plate-like portion facing the storage cell. The second convex portion is formed in a region between the storage cells arranged in a direction perpendicular to the one direction when seen in a plan view.

  Preferably, in the above invention, the second convex portion is formed in a linear shape. The second convex portion is formed so that the height in the vertical direction gradually increases along the fluid flow.

  In the above invention, preferably, the frame member includes a frame portion. A plurality of bar portions fixed to the frame portion and disposed apart from each other are included. The bar portion is disposed inside the frame portion. The bar is formed so as to contact the power storage cell. The flow path is configured by a space between the rod portions. The frame portion has a communication hole communicating with the flow path.

  Preferably, in the above invention, the bar portion is formed so that an angle formed between the extending direction and the horizontal direction is greater than 0 ° and not greater than 10 °.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage module which has the outstanding cooling performance of an electrical storage cell can be provided.

(Embodiment 1)
With reference to FIGS. 1 to 7, the power storage module according to Embodiment 1 will be described. The power storage module in the present embodiment is a battery module including a plurality of battery cells.

  FIG. 1 is a schematic perspective view of the battery module in the present embodiment. The battery module 10 in the present embodiment is mounted on a hybrid vehicle that uses an internal combustion engine such as a gasoline engine and a motor driven by a chargeable / dischargeable secondary battery as a power source. Battery module 10 according to the present embodiment is mounted on an automobile such that the direction indicated by arrow 83 is the horizontal direction.

  The battery module 10 includes a battery cell 33 as a storage cell. The battery module 10 includes a stacked body in which a plurality of battery cells 33 are stacked. The plurality of battery cells 33 are stacked in the thickness direction of the battery cell 33. An arrow 89 indicates the stacking direction of the battery cells 33. In battery module 10 in the present embodiment, battery cells 33 are stacked in two rows.

  The battery module 10 includes a frame member for holding the battery cell 33. The frame member includes the end plate 40 and the battery holder 1. The stacked body includes battery cells 33 and a battery holder 1. In the stacked body in the present embodiment, the battery cells 33 and the battery holders 1 are alternately arranged in the stacking direction of the battery cells 33.

  The battery holder 1 is disposed between adjacent battery cells 33 in the stacking direction of the battery cells 33. One battery cell 33 is sandwiched between two battery holders 1 arranged on both sides of one battery cell 33. A plurality of battery cells 33 are arranged between the battery holders 1 facing each other in a direction perpendicular to the stacking direction when viewed in plan. In the present embodiment, two battery cells 33 are arranged in a direction perpendicular to the stacking direction.

  Battery cell 33 in the present embodiment is a rectangular battery cell. Battery cell 33 in the present embodiment includes a lithium ion battery. The plurality of battery cells 33 are electrically connected to each other by a bus bar (not shown).

  The battery holder 1 is made of an electrically insulating material. The battery holder 1 electrically insulates the battery cells 33 adjacent in the stacking direction. Battery holder 1 in the present embodiment is formed of resin. The battery holder 1 is made of a resin material such as polyethylene (PE), polypropylene (PP), a polymer of polypropylene, nylon, or polybutylene terephthalate (PBT).

  The end plates 40 are disposed on both sides in the stacking direction of the stacked body. The end plate 40 in the present embodiment is formed in a plate shape. End plate 40 in the present embodiment is formed of resin. The end plate 40 is disposed so as to sandwich the stacked body of the battery cells 33 and the battery holder 1 from both sides in the stacking direction.

  The battery module 10 includes a restraining band 42 as a restraining member. The restraining band 42 in the present embodiment is formed in a plate shape. The restraining band 42 is formed to have a longitudinal direction. The restraint band 42 is arranged so that the longitudinal direction extends in the stacking direction of the battery cells 33.

  The restraint band 42 is disposed so as to fasten the end plates 40 to each other. The restraining band 42 is fixed to the end plate 40 by a rivet 45 as a fastening member. The restraining band 42 is disposed so as to restrain the battery cell 33 in the stacking direction. The plurality of battery holders 1 and the battery cells 33 are integrally held by a restraining band 42.

  The restraint band 42 is disposed in each row region of the battery cells 33. The restraint bands 42 are arranged so as to fix the rows of the respective battery cells 33. In the present embodiment, a plurality of restraining bands 42 are arranged for one row of battery cells 33.

  The battery holder 1 has an exhaust gas flow path portion 30. The exhaust gas flow path section 30 constitutes an exhaust gas flow path for circulating the gas discharged from the battery cell 33. The exhaust gas flow path portion 30 has a hollow interior. An exhaust pipe 31 is connected to the end of the exhaust gas flow path section 30.

  FIG. 2 is an exploded perspective view of the end portion of the battery module in the present embodiment. FIG. 3 shows a schematic cross-sectional view of the battery module in the present embodiment. FIG. 3 is a cross-sectional view when the battery module is cut along a plane extending in the longitudinal direction.

  With reference to FIGS. 1 to 3, battery cell 33 in the present embodiment has electrode 33 a. The electrode 33a is formed in a plate shape. The electrode 33 a is formed so as to protrude from the end face of the battery cell 33. The battery holder 1 is formed such that the electrode 33a is exposed from between the battery holders 1 adjacent to each other.

  The battery cell 33 has a pair of surfaces 33b facing each other. The surface 33 b is an area maximum surface having the largest area among the plurality of surfaces of the battery cell 33. The plurality of battery cells 33 are arranged such that the surfaces 33b are substantially parallel to each other.

  The battery holder 1 includes a base portion 1a as a plate-like portion. The battery holder 1 has a cover portion 1 d formed so as to cover the battery cell 33. The battery holder 1 has a rib 21 as a first convex portion. The rib 21 is formed on the surface of the base portion 1a facing the battery cell 33. The rib 21 contacts the surface 33 b of the battery cell 33. The battery cell 33 is clamped by being pressed by the rib 21 of one battery holder 1 and the surface of the base 1a of the opposite battery holder 1.

  The battery holder 1 has openings 16 and 17. The openings 16 and 17 in the present embodiment are formed by cutting out the side surface of the battery holder 1. Battery cell 33 in the present embodiment is cooled by air as a fluid. A channel 100 through which cooling air for cooling the battery cell 33 flows is formed between the ribs 21.

  The cooling air is taken in from the opening 16 as shown by an arrow 90, passes through the flow path 100, and is discharged from the opening 17. The cooling air flows through the flow path 100 between the ribs 21. The battery cell 33 is cooled by air flowing along the surface 33 b of the battery cell 33. The battery cell 33 is cooled by the air passing through the flow path 100.

  FIG. 4 shows a perspective view of the battery holder in the present embodiment. The base part 1a is formed in a flat plate shape. The rib 21 is formed on one surface of the front and back surfaces of the base portion 1a. The ribs 21 are formed so as to protrude from the surface of the base portion 1a main body. The rib 21 in the present embodiment is formed to extend linearly. A plurality of ribs 21 are formed at intervals.

  FIG. 5 shows a schematic front view of the battery holder in the present embodiment. The rib 21 is formed in a region where the battery cell indicated by the arrow 82 is disposed. The rib 21 is formed in a region corresponding to the row of battery cells. A space is formed between regions where the ribs 21 are formed.

  Air for cooling the battery cells flows from the opening 16 toward the opening 17 as indicated by an arrow 90. The battery module in the present embodiment is formed so that cooling air flows in the width direction of the battery module. The battery module is formed so that the fluid flows in a direction perpendicular to the stacking direction when viewed in plan. In the present embodiment, the battery module is formed such that cooling air flows from one side surface to the other side surface.

  Rib 21 in the present embodiment is formed such that the vertical height of the flow path gradually decreases along the flow of cooling air when viewed from the front. The rib 21 is formed so that the height in the vertical direction of the flow path gradually decreases as it goes downstream of the cooling air. The flow path formed by the ribs 21 in the present embodiment is formed so as to be inclined with respect to the horizontal direction. The flow path is formed so that an angle θ between the extending direction and the horizontal direction is greater than 0 degree and equal to or less than 10 degrees.

  FIG. 6 is a schematic cross-sectional view showing the arrangement of automobile equipment in the present embodiment. An arrow 81 indicates the front side of the vehicle. The automobile in the present embodiment is a so-called sedan type automobile. The automobile in the present embodiment includes a body 61. The body 61 is formed to have a longitudinal direction in the front-rear direction.

  The automobile in the present embodiment includes front wheels 62 and rear wheels 67. The automobile in the present embodiment has front seats 63a and 63b. The front seat 63a is a driver seat. The front seat 63b is a passenger seat. The automobile in the present embodiment includes a rear seat 64. The automobile includes a handle 65 disposed on the front side of the front seat 63a.

  The automobile in the present embodiment includes power storage device 50. A power storage device such as a battery module is housed in a case and mounted on an automobile. In the present invention, a device including a storage battery case and a power storage device housed in the storage battery case is referred to as a power storage device. The power storage device may include other components. Other components include, for example, electrical equipment that converts voltage.

  The power storage device 50 in the present embodiment includes a storage battery case 51. The storage battery case 51 is formed in a box shape. Inside the storage battery case 51, the battery module 10 according to the present embodiment is arranged. The power storage device 50 in the present embodiment includes a connection device box 52. A connection device such as a connector is arranged inside the connection device box 52.

  Power storage device 50 in the present embodiment is arranged in the rear part of the vehicle. The power storage device 50 is disposed on the rear side of the rear seat 64. The power storage device 50 is disposed on the rear side of the seat on the most rear side among the seats on which the passengers sit. The power storage device 50 is arranged so that the longitudinal direction of the battery module 10 is substantially parallel to the width direction of the body 61.

  FIG. 7 is another schematic cross-sectional view of the automobile in the present embodiment. The front seats 63a and 63b and the rear seat 64 are fixed to a floor panel 66 as a floor member. The living room where the person lives and the trunk room 68 are separated by a partition panel 69. Power storage device 50 in the present embodiment is arranged in trunk room 68 as a luggage compartment. The power storage device 50 is placed on the floor panel 66. The power storage device 50 is mounted on the automobile so that the width direction of the battery module 10 is substantially parallel to the horizontal direction indicated by the arrow 83. In the battery module 10, the flow path of the cooling air between the battery cells extends in the horizontal direction. The flow path of the cooling air extends in the front-rear direction of the automobile.

  With reference to FIG. 3 to FIG. 5, the channel 100 in the present embodiment is formed such that the height in the vertical direction gradually decreases along the flow of the fluid. When foreign matter such as dust or dust is contained in the air as a fluid, the foreign matter can be subjected to the action of gravity in addition to the flow of the fluid, and the foreign matter stops in the middle of the flow path 100. Can be suppressed. As a result, it is possible to suppress the flow path cross-sectional area from being reduced or the flow path from being blocked. In the present embodiment, it can be suppressed that foreign matters are clogged between the ribs 21 and the channel cross-sectional area of the channel 100 is reduced or the channel 100 is closed.

  Since the battery module in the present embodiment is excellent in the cooling capacity of the battery cell, the temperature of the battery cell is increased, and for example, it is possible to suppress the output power of the battery module from being limited. When the battery module is mounted on an automobile, the electric output of the battery module is limited, and it is possible to suppress adverse effects on acceleration performance. Alternatively, it is possible to suppress deterioration in fuel consumption due to insufficient power output.

  Referring to FIG. 5, the flow path in the present embodiment is formed such that an angle θ between the extending direction and the horizontal direction is greater than 0 degree and less than or equal to 10 degrees. The effect of suppressing foreign matter from staying in the flow path is improved as the tilt angle θ is increased. However, by increasing the inclination angle of the flow path, the flow of cooling air may be biased, and the battery cell may not be uniformly cooled. In consideration of cooling the battery cells almost uniformly, the flow path preferably has an angle formed by the extending direction and the horizontal direction of 10 degrees or less.

  The battery holder as the frame member in the present embodiment is formed of resin. For example, when air in a vehicle interior of an automobile is used as cooling air, high-humidity air may be blown to the battery module depending on the conditions in the vehicle interior. In the case where the frame member is formed of a hydrophilic material, water contained in the cooling air may condense and the condensed water may stay in the flow path. When foreign matter such as dust is taken into the condensed water staying in the flow path, the condensed water is difficult to evaporate, and the foreign matter is likely to remain in the flow path. Therefore, it is preferable to avoid the frame member having a hydrophilic oxide film formed on the surface or a hydrophilic film disposed thereon.

  On the other hand, when the frame member is formed of a material having water repellency, the condensed water moves quickly along the flow path. For this reason, the frame member is preferably formed of a material having water repellency.

  The rib as the first convex portion in the present embodiment is formed so as to extend linearly, but is not limited to this configuration, and the first convex portion may be formed in a curved shape. Or the 1st convex part may be formed so that it may be bent in the middle.

  With reference to FIG. 8 and FIG. 9, the electrical storage module as a comparative example in this Embodiment is demonstrated. The battery module as a comparative example differs in the configuration of the battery holder.

  In FIG. 8, the schematic perspective view of the battery holder of the battery module as a comparative example in this Embodiment is shown. In FIG. 9, the schematic front view of the battery holder of the battery module as a comparative example in this Embodiment is shown. The battery holder 2 of the comparative example has a base portion 2a as a plate-like portion formed in a plate shape. The battery holder 2 has a cover portion 2d for enclosing the storage cell from above and below.

  The battery holder 2 has a rib 22 as a first convex portion. The rib 22 is formed so as to extend linearly. The angle formed between the extending direction and the horizontal direction of the rib 22 is 0 °. The rib 22 is formed to extend in the horizontal direction indicated by the arrow 83. The flow path of the cooling air as a fluid is constituted by a space between the ribs 22. The cooling air flow path is formed to extend in the horizontal direction.

  In the battery module as a comparative example, the direction of the flow path and the direction of gravity are orthogonal. For this reason, when a foreign substance intrudes into each flow path, gravity does not act in the direction in which the foreign substance is discharged.

  Furthermore, in contrast to the inclination of the flow path of the battery holder in the present embodiment, in the case where each flow path is formed so that the height in the vertical direction gradually increases along the air flow, Gravity acting on the foreign material acts in the direction opposite to the direction in which the cooling air flows. For this reason, it becomes easy for foreign matter to remain in each channel.

  On the other hand, the battery module in the present embodiment more effectively suppresses the foreign matter from remaining in the flow path because the gravity acts in the direction in which the foreign substance is discharged in each flow path. Can do.

  Although the battery cell in this Embodiment is a lithium ion battery, it is not restricted to this form, This invention is applicable to a battery module provided with arbitrary battery cells. For example, the battery cell may include a nickel metal hydride battery. Moreover, as an electrical storage cell, it is not restricted to this form, What is necessary is just to have the function to store electricity. For example, the electricity storage cell may include a capacitor. Moreover, although the electrical storage cell in this Embodiment is formed in flat form, it is not restricted to this form, This invention is applicable to the electrical storage module containing the electrical storage cell of arbitrary shapes.

  In the present embodiment, a hybrid vehicle having a secondary battery has been described as an example. However, the present invention is not limited to this embodiment, and the fuel cell hybrid vehicle (FCHV: Fuel Cell) that uses a fuel cell and a secondary battery as drive sources The present invention can also be applied to a hybrid vehicle) or an electric vehicle (EV).

  The present invention is not limited to a power storage module disposed in an automobile, and can be applied to any power storage module in which power storage cells are stacked. For example, the present invention can be applied to a power storage module arranged in an arbitrary moving body. Or this invention is applicable to the electrical storage module fixed to the to-be-fixed object which does not move.

  In the present embodiment, air is used as a fluid for cooling the storage cell, but the present invention is not limited to this, and any fluid can be used. For example, a liquid may be used as a fluid for cooling the storage cell.

(Embodiment 2)
With reference to FIG. 10 and FIG. 11, the electrical storage module in Embodiment 2 is demonstrated. The power storage module according to the present embodiment is different from the first embodiment in the configuration of the battery holder as a frame member.

  In FIG. 10, the schematic front view of the battery holder of the 1st battery module in this Embodiment is shown. The battery holder 3 of the first battery module has a base part 3a as a plate-like part. The battery holder 3 has a cover 3d for covering the battery cells.

  The battery holder 3 has the rib 23 as a 1st convex part. The rib 23 is formed linearly. The rib 23 is formed so that the extending direction is inclined with respect to the horizontal direction. An area indicated by an arrow 82 is an area where battery cells are arranged.

  The rib 23 is formed so as to include two regions where the battery cells indicated by the arrows 82 are arranged. The rib 23 is formed across the region where the two rows of battery cells are arranged. The rib 23 is formed so as to extend from one battery cell region to another battery cell region. The cooling air flow path is formed by a space between the ribs 23. The cooling air flow path is formed so that the height in the vertical direction gradually decreases.

  Thus, even if the rib 23 as the first convex portion is formed so as to include a region where a plurality of battery cells are arranged, it is possible to suppress the foreign matter from remaining in the flow path.

  FIG. 11 shows a schematic front view of the battery holder of the second battery module in the present embodiment. The battery holder 4 of the second battery module includes a base portion 4a as a plate-like portion. The battery holder 4 has a cover 4d for covering the battery cells.

  The battery holder 4 has the rib 24 as a 1st convex part. The rib 24 is formed in a region corresponding to a region where each battery cell is disposed. The rib 24 is formed linearly. The flow path through which the cooling air flows is formed by a space sandwiched between the ribs 24. The rib 24 has a shape that bends in the middle of the flow path. Thus, even if the flow path is bent, it is possible to suppress foreign matters from remaining in the flow path.

  Alternatively, a part of the flow path may be formed so as to be substantially parallel to the horizontal direction, and the other part may be formed so as to be inclined with respect to the horizontal direction via a bent part.

  Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof will not be repeated here.

(Embodiment 3)
With reference to FIG. 12 and FIG. 13, the electrical storage module in Embodiment 3 is demonstrated. Each power storage module in the present embodiment is different from the first embodiment in the configuration of the battery holder as a frame member.

  FIG. 12 shows a schematic front view of the battery holder of the first battery module in the present embodiment. The first battery module includes a battery holder 5. The battery holder 5 includes a base portion 5a as a plate-like portion. The battery holder 5 has a cover 5d.

  The battery holder 5 includes ribs 21 as first protrusions that are linearly formed. The battery holder 5 has a rib 25 as a second convex portion formed on the surface of the base portion 5a. The rib 25 is disposed in a region between the regions where the battery cells indicated by the arrows 82 are disposed. In the present embodiment, a plurality of ribs 25 are formed. The rib 25 in the present embodiment is formed in a columnar shape.

  By disposing the ribs 25 as the second convex portions, the air flow can be disturbed in the space between the regions where the ribs 21 as the first convex portions are formed. The pressure can be made uniform. As a result, among the plurality of ribs 21 arranged on the upstream side and the plurality of ribs 21 arranged on the downstream side, in the flow path constituted by the plurality of ribs 21 arranged on the downstream side The air flow can be suppressed from being biased. As a result, it is possible to prevent the battery cells from being cooled unevenly.

  In FIG. 13, the schematic front view of the battery holder of the 2nd battery module in this Embodiment is shown. The second battery module includes a battery holder 6. The battery holder 6 has a base portion 6a as a plate-like portion. The battery holder 6 has a cover 6d.

  The battery holder 6 has the rib 21 as a 1st convex part. The battery holder 6 has a rib 26 as a second convex portion formed on the base portion 6a. The rib 26 is formed in a region between the two regions where the battery cell indicated by the arrow 82 is disposed. The ribs 26 are formed in regions between the regions where the plurality of ribs 21 are formed.

  The ribs 26 are formed in a linear shape when viewed in plan. The ribs 26 are formed so that the height in the vertical direction gradually increases along the fluid flow. The rib 26 is formed so that the height in the vertical direction becomes higher toward the downstream side of the fluid. The ribs 26 are formed so as to be inclined in a direction opposite to the direction in which the ribs 21 are inclined.

  In the second battery module, by arranging the ribs 26 as the second convex portions, the air directed downward in the vertical direction can be changed upward, and the plurality of downstream ribs 21 are formed. In the formed region, it is possible to suppress the deviation of the flow of the cooling air. As a result, it is possible to prevent the battery cells from being cooled unevenly.

  In the present embodiment, the rib as the second convex portion is formed in a straight line or a circle when viewed from the front, but is not limited to this form, and the second convex portion adopts an arbitrary shape. can do.

  Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof will not be repeated here.

(Embodiment 4)
With reference to FIG. 14 and FIG. 15, the electrical storage module in Embodiment 4 is demonstrated. The power storage module according to the present embodiment is different from the first embodiment in the configuration of the battery holder as a frame member.

  FIG. 14 shows a schematic exploded perspective view of the battery module in the present embodiment. FIG. 15 is a schematic cross-sectional view of the second battery holder of the battery module in the present embodiment.

  Referring to FIG. 14, the battery module in the present embodiment includes a battery holder 11 as a first battery holder. The battery module includes a battery holder 12 as a second battery holder. The battery holders 11 and 12 are formed so as to sandwich the battery cell 33, respectively. The battery holder 11 as the first battery holder is formed so as to hold one side of the battery cell 33. In the present embodiment, depending on the battery holder 11, the cooling flow path is not configured.

  Referring to FIGS. 14 and 15, in the present embodiment, a battery holder 12 as a second battery holder constitutes a flow path for flowing cooling air. The battery holder 12 includes a frame portion 12a formed in a frame shape. The frame portion 12 a is formed so as to hold the battery cell 33.

  The battery holder 12 includes a plurality of rod portions 12b that are fixed to the frame portion 12a and are spaced apart from each other. The rod portion 12b is formed in a rod shape. The plurality of rod portions 12b are formed so that the extending directions thereof are substantially parallel to each other. The bar portion 12b is arranged such that the extending direction is inclined with respect to the horizontal direction. The rod portion 12 b is formed so as to contact the surface 33 b of the battery cell 33.

  A flow path for flowing cooling air is formed by the space between the rod portions 12b. The frame portion 12a has a communication hole 12c that communicates with the flow path. The communication hole 12c is formed so as to correspond to the space between the rod portions 12b. The cooling air flows in the width direction as indicated by an arrow 91. The cooling air enters from the communication hole 12c formed on one side surface of the battery holder 12, and is discharged from the communication hole 12c formed on the other side surface.

  The flow path of the cooling air in the present embodiment is formed so that the height in the vertical direction gradually decreases along the flow of the cooling air. That is, the flow path is formed so that the height in the vertical direction decreases toward the downstream side.

  Also in the battery module of the present embodiment, it is possible to suppress foreign matters from remaining in the flow paths of the respective fluids. As in the first embodiment, it is preferable that the angle formed between the extending direction of the cooling air flow path and the horizontal direction is greater than 0 degrees and equal to or less than 10 degrees.

  In the present embodiment, the cooling air flow path is configured by disposing the rod portion on the frame portion of the battery holder. However, the flow path of the cooling air is not limited to this configuration, and the cooling pipe is framed. You may be comprised by arrange | positioning to a part.

  Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof will not be repeated here.

  In the respective drawings described above, the same or corresponding parts are denoted by the same reference numerals.

  In addition, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

1 is a schematic perspective view of a battery module in a first embodiment. 3 is a schematic exploded perspective view of an end portion of the battery module in Embodiment 1. FIG. 1 is a schematic cross-sectional view of a battery module in a first embodiment. 3 is a schematic perspective view of a battery holder of the battery module according to Embodiment 1. FIG. 3 is a schematic front view of a battery holder of the battery module according to Embodiment 1. FIG. 1 is a first schematic cross-sectional view of an automobile in a first embodiment. 4 is a second schematic cross-sectional view of the automobile in the first embodiment. FIG. 3 is a schematic perspective view of a battery holder of a battery module as a comparative example in Embodiment 1. FIG. 3 is a schematic front view of a battery holder of a battery module as a comparative example in Embodiment 1. FIG. 6 is a schematic front view of a battery holder of a first battery module in Embodiment 2. FIG. 6 is a schematic front view of a battery holder of a second battery module according to Embodiment 2. FIG. 6 is a schematic front view of a battery holder of a first battery module according to Embodiment 3. FIG. 6 is a schematic front view of a battery holder of a second battery module according to Embodiment 3. FIG. FIG. 6 is a schematic exploded perspective view of a battery module in a fourth embodiment. 6 is a schematic cross-sectional view of a second battery holder of the battery module according to Embodiment 4. FIG.

Explanation of symbols

  1-6 Battery holder, 1a, 2a, 3a, 4a, 5a, 6a Base part, 1d, 2d, 3d, 4d, 5d, 6d Cover part, 10 Battery module, 11, 12 Battery holder, 12a Frame part, 12b Bar Part, 12c communication hole, 16, 17 opening part, 21-26 rib, 30 exhaust gas flow path part, 31 exhaust pipe, 33 battery cell, 33a electrode, 33b surface, 40 end plate, 42 restraint band, 45 rivet, 50 power storage Device, 51 Storage battery case, 52 Connection box, 61 Body, 62 Front wheel, 63a, 63b Front seat, 64 Rear seat, 65 Handle, 66 Floor panel, 67 Rear wheel, 68 Trunk room, 69 Partition panel, 81-83, 89 ~ 91 arrows, 100 channels.

Claims (9)

A storage cell;
A frame member for holding the electricity storage cell;
A flow path through which a fluid for cooling the storage cell flows,
The storage cell and the frame member are stacked in one direction,
The flow path is formed so that the fluid flows in a direction perpendicular to the one direction when seen in plan view,
The flow path is constituted by the frame member,
At least a part of the flow path is a power storage module formed such that the vertical height gradually decreases along the fluid flow. The frame member includes a plate-like portion formed in a plate shape,
A first convex portion formed on a surface of the plate-like portion facing the storage cell,
The first convex portion is formed so as to contact the power storage cell,
The first convex portion is formed to extend linearly,
The power storage module according to claim 1, wherein the flow path is configured by a space between the first protrusions.   The power storage module according to claim 2, wherein the first protrusion is formed to extend linearly.   The power storage module according to claim 3, wherein the first convex portion is formed such that an angle formed between the extending direction and the horizontal direction is greater than 0 ° and equal to or less than 10 °. Between the frame members facing each other, a plurality of the storage cells are arranged in a direction perpendicular to the one direction when viewed in plan,
5. The power storage module according to claim 1, wherein the first convex portion is formed to correspond to each region where the power storage cell is disposed. The frame member includes a second convex portion formed on a surface of the plate-like portion facing the storage cell,
The power storage module according to claim 5, wherein the second protrusion is formed in a region between the power storage cells arranged in a direction perpendicular to the one direction when viewed in plan. The second convex portion is formed in a linear shape,
The power storage module according to claim 6, wherein the second convex portion is formed so that a height in a vertical direction gradually increases along the flow of the fluid. The frame member includes a frame part,
A plurality of bar portions fixed to the frame portion and disposed apart from each other;
The bar portion is disposed inside the frame portion,
The bar portion is formed so as to contact the power storage cell,
The flow path is constituted by a space between the rod portions,
The power storage module according to claim 1, wherein the frame portion has a communication hole communicating with the flow path.   The power storage module according to claim 8, wherein the bar portion is formed such that an angle formed between an extending direction and a horizontal direction is greater than 0 ° and equal to or less than 10 °.

Images