JP6921728B2 - Battery pack spacer and battery pack - Google Patents

Description

The present invention relates to a battery pack spacer attached to an assembled battery and housed in the battery pack, and a battery pack provided with a battery pack spacer.

As is well known, in electric vehicles and hybrid vehicles, an electric motor is used as a power source or an auxiliary power source. As a power source for this electric motor, a battery pack in which a plurality of battery modules are connected in series and stored in a battery storage case is often used. The assembled battery has a restraining structure for integrally restraining a plurality of battery modules, and an example of such a structure is described in Patent Document 1.

In the battery pack described in Patent Document 1, a plurality of battery modules (batteries) are closely laminated in the thickness direction to form a battery module row. The battery module is a flat resin box body having one or a plurality of single batteries, which are secondary batteries such as nickel-metal hydride batteries, inside. The battery pack has a plurality of batteries by arranging end plates at both ends in the stacking direction of the plurality of stacked battery modules and connecting the end plates with a pair of lower restraint rods and a pair of upper restraint rods. It constitutes an assembled battery in which the module is integrally restrained.

JP-A-2002-343324

Further, in the battery pack described in Patent Document 1, the assembled battery is fixed to the lower case (lower case), and an air flow passage through which cooling air is circulated between the lower surface of the battery module and the upper surface of the lower case. It has. When air is supplied to the air flow passage from one of the stacking directions, the cooling air may not be evenly supplied to the plurality of battery modules.

In recent years, a technique of dividing an air flow passage into two near the center of the stacking direction and supplying cooling air to the air flow passage from both of the stacking directions has been studied. At this time, a spacer for dividing the air flow passage into two in the stacking direction is attached to the lower restraint rod, but the lower restraint rod, which is long in the stacking direction, is a fitting portion of the spacer narrower than the rod diameter. When pushed in the mounting direction by the entrance, it elastically deforms and escapes. Therefore, it takes time and effort to fit the lower restraint rod into the fitting portion, such as pressing the side opposite to the mounting direction of the lower restraint rod. Further, the upper restraint rod also has the same problem when the spacer is attached.

The present invention has been made in view of such circumstances, and an object of the present invention is a battery pack spacer capable of reducing the time and effort required for attachment to an assembled battery, and a battery provided with a battery pack spacer. To provide the pack.

The battery pack spacer that solves the above problems is a battery pack spacer that partitions an air flow passage formed between the assembled battery and the case in a battery pack containing the assembled battery in a case. The assembled battery includes a pair of end plates that sandwich the plurality of battery modules at both ends in the stacking direction in which a plurality of battery modules are closely stacked in the thickness direction, and the pair of end plates that are extended in the stacking direction. A plurality of rods that restrain each other and a plane that includes a pair of rods that are parallel to each other at a first distance among the plurality of rods and that is parallel to one side surface of the assembled battery. The air flow passage is provided between one side surface of the assembled battery and the case, and the battery pack spacer extends in the stacking direction on a surface facing one side surface of the assembled battery. It is a groove and includes a first fitting portion and a second fitting portion into which the pair of rods are fitted, and the first fitting portion and the second fitting portion are the facing surfaces. The first fitting is provided with an opening that opens in, a fixing portion that includes the bottom surface of the groove and is fitted and fixed to the pair of rods, and a fitting passage that extends from the opening to the fixing portion. The fitting passage of the portion and the fitting passage of the second fitting portion are on the side surfaces of the two fitting passages on the side close to each other or on the side surfaces separated from each other, respectively. The pair of rods are provided with an overhanging portion that makes the first interval of the pair of rods different from the first interval.

The battery pack that solves the above problems is a battery pack in which an assembled battery is housed in a case, and the assembled battery is a plurality of batteries at both ends in a stacking direction in which a plurality of battery modules are closely laminated in the thickness direction. A pair of end plates that sandwich the module, a plurality of rods that extend in the stacking direction and mutually restrain the pair of end plates, and a pair of rods that are parallel to each other at the first distance among the plurality of rods. A battery pack having a flat surface including a rod and parallel to one side surface of the assembled battery, and partitioning an air flow passage formed between one side surface of the assembled battery and the case. The battery pack spacer is provided with a spacer, which is a groove extending in the stacking direction on a surface facing one side surface of the assembled battery, and is a first fitting portion and a first fitting portion into which the pair of rods are fitted. The first fitting portion and the second fitting portion include two fitting portions, and the first fitting portion and the second fitting portion include an opening that opens to the facing surface and the bottom surface of the groove, and the pair of rods are fitted and fixed. The fixing portion and the fitting passage from the opening to the fixing portion are provided, and the fitting passage of the first fitting portion and the fitting passage of the second fitting portion are respectively provided. The first distance between the pair of rods passing through the fitting passage on the side surfaces on the side close to each other or the side surfaces on the side separated from each other of the two fitting passages is different from the first distance. It has an overhanging portion with an interval of 2.

Since the rod that restrains the end plate is long, it is easy to elastically deform in the middle, and when attaching the spacer to this rod, the position of the rod so that the rod pushed by the spacer being attached does not escape. It takes time and effort to fix. In this respect, according to such a configuration, the direction in which the rod escapes can be changed to the direction including the direction in which the distance between the rods is changed (width direction) with respect to the direction in which the spacer is pushed (vertical direction). Therefore, when the spacer pressed against the rod is pushed in, the amount of elastic deformation of the rod in the vertical direction is reduced, so that the amount of pushing the spacer in order to fit the fixing portion of the spacer into the rod is reduced. It will be. Therefore, the time and effort required to attach the battery pack spacer to the assembled battery can be reduced.

As a preferred configuration, the overhanging portion is set so that the length of the overhanging portion extending in the extending direction of the first interval is 20% or more and 50% or less of the diameter of the rod.
According to such a configuration, the pair of rods can be bent in the direction of the first interval with an appropriate force.

As a preferred configuration, the overhanging portion is provided on the mutually distant side surfaces of the fitting passage.
According to such a configuration, since the distance between the side surfaces of the fitting passages on the mutually distant sides is narrower than the distance between the pair of rods as the first distance, the pair in the width direction. By bending the rod closer to it, the amount of movement in the vertical direction is reduced.

As a preferred configuration, the distance between the opening of the first fitting portion and the opening of the second fitting portion is such that the distance between the opening ends near the side surface of the overhanging portion is the distance between the rods. The distance is set to be longer than the distance with which the second interval is set.

According to such a configuration, when the overhanging portion narrows the distance between the rods, the distance between the opening ends of the openings is set to be longer than the distance between the rods is set to the second distance. ing. Therefore, when the two openings of the spacer are opposed to the pair of rods, the opening ends of the respective openings can be positioned on the outer side of the pair of rods so as to abut on the outer peripheral surface of the rods. .. Then, when the spacer is pressed, a force is applied to the rod so as to move inward. As a result, a pair of parallel rods at the opening promote elastic deformation in the approaching direction guided by the overhanging portion, and the battery pack spacer can be easily attached to the rod.

As a preferred configuration, the overhanging portion is provided on the side surface of the fitting passage on the side close to each other.
According to such a configuration, the distance between the side surfaces of the fitting passages on the side close to each other is wider than the distance between the pair of rods as the first distance, and therefore the pair of rods in the width direction. By bending away from each other, the amount of movement in the vertical direction is reduced.

As a preferred configuration, the distance between the opening of the first fitting portion and the opening of the second fitting portion is such that the distance between the opening ends near the side surface of the overhanging portion is the distance between the rods. The distance is set to be shorter than the distance with which the second interval is set.

According to such a configuration, when the overhanging portion widens the distance between the rods, the distance between the opening ends of the openings is set to a shorter distance than the distance between the rods is set to the second distance. ing. Therefore, when the two openings of the spacer are opposed to the pair of rods, the opening ends of the respective openings can be positioned inward of the pair of rods so as to abut on the inner peripheral surface of the rods. .. Then, when the spacer is pressed, a force is applied to the rod so as to move outward. As a result, the pair of parallel rods at the opening promotes elastic deformation in the direction in which the overhanging portion is guided, and the battery pack spacer can be easily attached to the rod.

As a preferred configuration, the overhanging portion of the fitting passage has an inclined surface having an inclination of 30 ° or more and 50 ° or less with respect to a direction perpendicular to one side surface of the assembled battery.
According to such a configuration, the pushing force is appropriately distributed on the inclined surface, so that the pushing force applied to the spacer is appropriately adjusted, and the rod in contact with the opening is appropriately moved in the vertical direction and the width direction. It can be elastically deformed.

As a preferred configuration, the fitting passage has a protruding portion that projects an open end close to the overhanging portion in the direction of one side surface of the assembled battery, and the inclined surface extends to the protruding portion.

According to such a configuration, since the protruding portion has a longer inclined surface, even if the distance between the rods and the distance between the fitting passages are different, it is possible to make it easier for the rod to enter the opening and to enter the opening. The rod can be moved along the ramp along the mating passage.

As a preferred configuration, the air flow passage is a passage through which cooling air flows.
According to such a configuration, by shortening the distance of the air flow passage through which the inflowing cooling air passes, the cooling air can be evenly supplied to the battery module, and the battery pack can be suitably cooled. ..

As a preferred configuration, the assembled battery has an outflow passage for allowing cooling air to flow out to the other side surface opposite to the one side surface, and has another pair of rods among the plurality of rods on the other side surface. The outflow passage formed between the other side surface of the assembled battery and the case is partitioned, and a spacer for a battery pack fitted to the other pair of rods is further provided.

According to such a configuration, the outflow passage of the cooling air is partitioned, so that the outflow passage of the cooling air is shortened and the cooling air flows more evenly.

According to the present invention, it is possible to reduce the time and effort required for attachment to the assembled battery.

A cross-sectional view showing a side sectional structure in the longitudinal direction of one embodiment of a battery pack provided with a spacer for the battery pack. The perspective view which shows an example of the assembled battery in the same embodiment by the perspective structure. It is a cross-sectional view in the width direction of the assembled battery in the 3-3 cross-sectional line of FIG. The enlarged view which shows the relationship between the spacer for a battery pack and a rod in the same embodiment. FIG. 5 is an end view showing a side structure of a battery module and a battery pack spacer for another embodiment of the battery pack provided with a battery pack spacer.

An embodiment of the battery pack spacer and the battery pack will be described with reference to FIGS. 1 to 4. The battery pack 10 is mounted on an electric vehicle or a hybrid vehicle to supply electric power to an electric motor or the like.

As shown in FIG. 1, the battery pack 10 houses the assembled battery 11 in the internal space of the outer case 12. The outer case 12 has an internal space when the lower case 121 and the upper case 122 are combined so that their inner surfaces face each other in the vertical direction in the drawing.

The assembled battery 11 is configured by stacking a plurality of battery modules 20 in close contact with each other in the thickness direction, which is the left-right direction in the drawing. The battery module 20 is a nickel-metal hydride secondary battery or a lithium ion secondary battery, and is a closed-type battery having a rectangular parallelepiped outer shape. The assembled battery 11 is an upper surface composed of a lower surface 111 formed of a lower surface 201 of the battery modules 20 aligned along the stacking direction of the plurality of battery modules 20 (hereinafter referred to as a stacking direction) and an upper surface 202 of the battery modules 20 aligned in the same direction. It includes 112. The direction orthogonal to the lower surface 111 and the upper surface 112 of the assembled battery 11 is the vertical direction, and the longitudinal direction of the battery module 20 and the direction orthogonal to the stacking direction and the vertical direction is the width direction.

The battery pack 10 extends in the stacking direction between the inner side surface 123 of the lower case 121 and the lower surface 111 of the assembled battery 11, and includes a supply passage 14 as an air flow passage for supplying cooling air to the assembled battery 11. Further, the battery pack 10 extends in the stacking direction between the inner side surface 124 of the upper case 122 and the upper surface 112 of the assembled battery 11, and includes an outflow passage 15 through which the cooling air supplied to the assembled battery 11 flows out.

The supply passage 14 and the outflow passage 15 communicate with each other via the ventilation passages 21 provided between the two adjacent battery modules 20 in the assembled battery 11. The assembled battery 11 does not have a passage for ventilation between the lower surface 111 and the upper surface 112 on the side surface other than the outer case 12. Therefore, in the assembled battery 11, the air supplied to the supply passage 14 flows out to the outflow passage 15 through the ventilation passage 21.

The supply passage 14 is divided into two regions 14A and 14B by a first spacer 31 as a battery pack spacer arranged below the battery module 203 in the middle in the longitudinal direction of the assembled battery 11. The first spacer 31 is provided between the lower surface 201 of the battery module 203 and the inner surface 123 of the lower case 121 to prevent or suppress the flow of air between the two partitioned regions 14A and 14B. ..

The outflow passage 15 is divided into two regions 15A and 15B by a second spacer 32 as a battery pack spacer arranged above the battery module 203 in the middle of the longitudinal direction of the assembled battery 11. The second spacer 32 is provided between the upper surface 202 of the battery module 203 and the inner side surface 124 of the upper case 122 to prevent or suppress the flow of air between the two partitioned regions 15A and 15B. There is.

In the supply passage 14, cooling air taken in from the outside of the battery pack 10 by a fan or the like is supplied to each of the two regions 14A and 14B. The fan is, for example, a centrifugal blower. In the two regions 14A and 14B of the supply passage 14, the respective intake ports are provided at the ends of the assembled batteries 11 in the stacking direction. Therefore, the supply passage 14 circulates the cooling air supplied from the air supply port in the stacking direction of each battery module 20, and distributes the cooling air to each ventilation passage 21 extending in the direction orthogonal to the supply passage 14.

The outflow passage 15 collects the cooling air flowing out from the ventilation passage 21 of the assembled battery 11 and exhausts the cooling air from each of the two regions 15A and 15B to the outside of the battery pack 10. The two regions 15A and 15B of the outflow passage 15 are provided with exhaust ports at the ends of the assembled batteries 11 in the stacking direction, respectively. Therefore, the outflow passage 15 circulates the collected cooling air in the stacking direction and discharges the collected cooling air from the exhaust port in the stacking direction.

By dividing the supply passage 14 into two regions 14A and 14B, the length of the passage is shortened and the pressure distribution is likely to be uniform, the cooling air flows evenly into each ventilation passage 21, and the battery module 20 is evenly distributed. It will be cooled. Since the battery module 20 having a high temperature progresses in deterioration faster, it becomes possible to suppress the progress of deterioration as the assembled battery 11 by cooling the battery module 20 evenly. In addition, the battery performance of the plurality of battery modules 20 constituting the assembled battery 11 can be maintained in a good balance.

Further, by dividing the outflow passage 15 into two regions 15A and 15B, the length of the passage is shortened and the pressure distribution is likely to be uniform, and the outflow of the cooling air from each ventilation passage 21 is equalized so that the battery The module 20 will be cooled evenly. As a result, the progress of deterioration of the assembled battery 11 can be suppressed by cooling evenly, and the battery performance of the plurality of battery modules 20 constituting the assembled battery 11 can be maintained in a good balance. become able to.

As shown in FIG. 2, the assembled battery 11 has end plates 23 and 24 at both ends of the plurality of battery modules 20 in the stacking direction, respectively. That is, the two end plates 23 and 24 sandwich the plurality of battery modules 20 in the stacking direction. The two end plates 23 and 24 each include a pair of rod fastening portions 251 projecting in the direction of the lower surface 111 of the assembled battery 11 and a pair of rod fastening portions 261 projecting in the direction of the upper surface 112 of the assembled battery 11. There is. The two end plates 23 and 24 are fastened on the lower surface 111 side of the assembled battery 11 by a pair of rod fastening portions 251 facing each other by a restraining member 25 as a pair of rods having a stacking direction in the longitudinal direction. Further, the two end plates 23 and 24 are fastened on the upper surface 112 side of the assembled battery 11 by a pair of rod fastening portions 261 facing each other by a pair of restraint members 26 having a stacking direction in the longitudinal direction. Therefore, in the assembled battery 11, a plurality of battery modules 20 are tightened and fixed in the stacking direction between the two end plates 23 and 24 to which the restraining members 25 and 26 arranged above and below the assembled battery 11 are fastened. .. The restraint member 25 has a gap H1 (see FIG. 1) with the lower surface 111 of the assembled battery 11, and the restraint member 26 has a gap H2 (see FIG. 1) with the upper surface 112 of the assembled battery 11. ), Which are provided between the two end plates 23 and 24, respectively.

The restraint member 25 is composed of two rods 25A and 25B, and the restraint member 26 is composed of two rods 26A and 26B. Each of the rods 25A, 25B, 26A, and 26B is a metal cylinder or cylinder, and is provided in the assembled battery 11 with the longitudinal direction in the stacking direction. In the present embodiment, the rods 25A, 25B, 26A, and 26B are all cylindrical and have the same diameter and length in the longitudinal direction. For example, when 40 battery modules 20 are constrained in the stacking direction, the length of each rod 25A, 25B, 26A, 26B is about 600 mm, and if the diameter Dr is φ8, the direction is orthogonal to the longitudinal direction. The rigidity of the is low, and resonance occurs and it is easy to swing in the direction orthogonal to the longitudinal direction.

As shown in FIG. 3, the restraint member 25 has a center distance L25C as a first distance between the two rods 25A and 25B in the width direction, and has a plane including the two rods 25A and 25B. The gap H1 is a flat surface parallel to the lower surface 111 of the assembled battery 11.

The restraint member 26 has a center distance L26C as a first distance between the two rods 26A and 26B in the width direction, and the flat surface including the two rods 26A and 26B is formed by the gap H2 in the assembled battery 11. It is a flat surface parallel to the upper surface 112.

As shown in FIG. 2, the plurality of battery modules 20 have their longitudinal surfaces of each battery module 20 oriented in the stacking direction, and face each other with the longitudinal surfaces of other adjacent battery modules 20. The surface in the longitudinal direction has irregularities and the like, and forms a space that becomes a ventilation passage 21 when facing each other.

That is, as shown in FIG. 1, the adjacent battery modules 20 form a ventilation passage 21 having a predetermined distance between the opposing longitudinal surfaces. The ventilation passage 21 is used as a passage for cooling air that cools the battery module 20. The ventilation passage 21 absorbs the heat of the battery modules 20 on both sides of the passage by the cooling air flowing through the passage to dissipate heat from the battery module 20 and cool the battery module 20.

The first spacer 31 and the second spacer 32 will be described with reference to FIG.
The first spacer 31 is assembled to the restraint member 25 on the lower surface 111 side of the assembled battery 11. As a result, the first spacer 31 is attached to the lower surface 201 of the battery module 203 to partition the supply passage 14.

The second spacer 32 is assembled to the restraint member 26 on the upper surface 112 side of the assembled battery 11. As a result, the second spacer 32 is attached to the upper surface 202 of the battery module 203 to partition the outflow passage 15.

The first spacer 31 has an outer shape smaller than the cross-sectional shape in the stacking direction of the supply passage 14, and an elastic deformation member 41 made of a closed cell sponge or the like is arranged on the outer peripheral portion. The elastically deforming member 41 is partitioned by filling the gap between the first spacer 31 and the lower surface 111 of the assembled battery 11 and the gap between the first spacer 31 and the lower case 121 in the supply passage 14. Air does not flow between the two regions 14A and 14B.

The second spacer 32 has an outer shape smaller than the cross-sectional shape in the stacking direction of the outflow passage 15, and an elastic deformation member 42 made of a closed cell sponge or the like is arranged on the outer peripheral portion. The elastically deforming member 42 is divided by filling the gap between the second spacer 32 and the upper surface 112 of the assembled battery 11 and the gap between the second spacer 32 and the upper case 122 in the outflow passage 15. Air does not flow to each other between the two regions 15A and 15B.

The first spacer 31 includes a lower fitting portion 35 for fitting the restraint member 25 on the lower surface 111 side of the assembled battery 11. Further, the second spacer 32 includes an upper fitting portion 36 for fitting the restraint member 26 on the upper surface 112 side of the assembled battery 11.

The lower fitting portion 35 includes a first fitting portion 35A that fits into one rod 25A of the restraint member 25 and a second fitting portion 35B that fits into the other rod 25B. There is. In the lower fitting portion 35, the first fitting portion 35A and the second fitting portion 35B are portions that are formed through the first spacer 31 in a groove shape in the stacking direction, and are batteries. A recess is provided on the side surface of the module 20 facing the lower surface 201. By fitting the restraint member 25 to the lower fitting portion 35, resonance can be suppressed. In particular, since the restraint member 25 is fitted to the lower fitting portion 35 in the middle of the stacking direction, resonance is suitably suppressed.

The upper fitting portion 36 includes a first fitting portion 36A that fits into one rod 26A of the restraint member 26, and a second fitting portion 36B that fits into the other rod 26B. .. In the upper fitting portion 36, the first fitting portion 36A and the second fitting portion 36B are portions formed through the second spacer 32 in a groove shape with respect to the stacking direction, and are formed in a groove shape. A recess is provided on the side surface of the 20 facing the upper surface 202. By fitting the restraint member 26 to the upper fitting portion 36, resonance can be suppressed. In particular, since the restraint member 26 is fitted to the upper fitting portion 36 in the middle of the stacking direction, resonance is suitably suppressed.

In the lower fitting portion 35, the distance between the first fitting portion 35A and the second fitting portion 35B is the maximum width L1. The maximum width L1 is the same as the maximum width L25, which is the longest distance between the two rods 25A and 25B of the restraint member 25 that do not face each other (non-opposing peripheral surfaces). The maximum width L1 is equal to the length obtained by adding two radii of the restraining member 25 to the center spacing L25C when the two rods 25A and 25B of the restraining member 25 have a center spacing L25C.

Further, in the lower fitting portion 35, the first fitting portion 35A and the second fitting portion 35B also have an interval L2 shorter than the maximum width L1 between them. The interval L2 is the same as the interval when the maximum width L25, which is the interval between the non-opposing peripheral surfaces of the restraint member 25, is narrowed. The first fitting portion 35A and the second fitting portion 35B have a line-symmetrical shape with a line equidistant from them as a line of symmetry.

In the upper fitting portion 36, the distance between the first fitting portion 36A and the second fitting portion 36B is the maximum width L3. The maximum width L3 is the same as the maximum width L26, which is the longest distance between the non-opposing peripheral surfaces of the two rods 26A and 26B of the restraint member 26. The maximum width L3 is equal to the length obtained by adding two radii of the restraining member 26 to the center spacing L26C when the two rods 26A and 26B of the restraining member 26 have the center spacing L26C.

Further, in the upper fitting portion 36, the first fitting portion 36A and the second fitting portion 36B have an interval L4 shorter than the maximum width L3 between them. The interval L4 makes the maximum width L26 between the restraint members 26 narrower at the same interval L4. The first fitting portion 36A and the second fitting portion 36B have a line-symmetrical shape with a line equidistant from them as a line of symmetry.

The second spacer 32 has a convex portion 37 that defines the longitudinal direction in the longitudinal direction of the battery module 203. The convex portion 37 is fitted into the concave portion 205 by guiding the side surface of the battery module 203 facing the stacking direction to the guide 204 formed on the upper surface 202 of the battery module 203, whereby the length of the second spacer 32 with respect to the battery module 203 is long. Regulate the position in the direction and thickness direction. In the second spacer 32, the first fitting portion 36A is positioned with respect to one rod 26A and the second fitting portion 36B is positioned with respect to the other rod 26B due to the position restriction by the convex portion 37. NS.

Therefore, when the first spacer 31 is attached to the restraining member 25 from the lower side in the vertical direction, the center spacing L25C of the two rods 25A and 25B is once shorter than the center spacing L25C as the center spacing as the second spacing. It is narrowed to L2C and then attached to the first fitting portion 35A and the second fitting portion 35B in a manner of returning to the center spacing L25C. The restraint member 25 bends in the direction of the lower surface 201 of the battery module 203 in response to being pushed by the pressing force P11 from the lower side in the vertical direction to the first spacer 31. At this time, if the two rods 25A and 25B are bent to a position where they come into contact with the lower surface 201 of the battery module 203, it becomes difficult to fit the first fitting portion 35A and the second fitting portion 35B. Or, a strong force is required for the pressing force P11. In this respect, since the first fitting portion 35A and the second fitting portion 35B apply an oblique force to the two rods 25A and 25B, the movement of the two rods 25A and 25B in the lower surface 201 direction is suppressed. Therefore, the first spacer 31 can be easily attached. Further, the pressing force P11 applied to the first spacer 31 can be suppressed low.

Similarly, in the restraining member 26, when the second spacer 32 is attached from the upper side in the vertical direction, the center spacing L26C of the two rods 26A and 26B is once shorter than the center spacing L26C as the center spacing as the second spacing. It is narrowed to L4C and then attached to the first fitting portion 36A and the second fitting portion 36B in a manner of returning to the center spacing L26C. The restraint member 26 bends in the direction of the upper surface 202 of the battery module 203 in response to being pushed by the pressing force P1 from the upper side in the vertical direction to the second spacer 32. At this time, if the two rods 26A and 26B are bent to a position where they come into contact with the upper surface 202 of the battery module 203, it becomes difficult to fit the first fitting portion 36A and the second fitting portion 36B. Or, a strong force is required for the pressing force P1. In this respect, since the first fitting portion 36A and the second fitting portion 36B apply an oblique force to the two rods 26A and 26B, the movement of the two rods 26A and 26B in the upper surface 202 direction is suppressed. Therefore, the attachment of the second spacer 32 becomes easy. Further, the pressing force P1 applied to the second spacer 32 can be suppressed low.

Each fitting portion 35, 36 will be described with reference to FIG.
The first fitting portion 35A and the second fitting portion 35B of the first spacer 31 and the first fitting portion 36A and the second fitting portion 36B of the second spacer 32 are all provided. Since the rods 25A, 25B, 26A, and 26B, which are cylinders having the same diameter, are fitted together, they are formed to have the same shape (symmetrical shape) and the same size. Therefore, in particular, the first fitting portion 36A of the second spacer 32 will be described below, and for convenience of explanation, the first fitting portion 35A of the first spacer 31 and the first fitting portion 35A The description of the second fitting portion 35B and the second fitting portion 36B of the second spacer 32 will be omitted.

As shown in FIG. 4, the first fitting portion 36A is recessed in the vertical direction as a groove extending in the stacking direction with respect to the surface (opposing surface) of the second spacer 32 facing the upper surface 112 of the battery module 20. Has been done. That is, the first fitting portion 36A has an opening 361 that opens to the facing surface, a fixing portion 362 that includes the bottom of the groove and into which one rod 26A is fitted and fixed, and the opening 361 to the fixing portion 362. It includes a fitting passage 363 leading to it. Further, the first fitting portion 36A has an overhanging portion 364 protruding in the width direction in the middle of the fitting passage 363 extending in the vertical direction thereof.

The fixing portion 362 of the first fitting portion 36A is provided in a range including the bottom portion of the groove-shaped first fitting portion 36A. The fixing portion 362 of the first fitting portion 36A has a maximum width L3 as a distance between the fixing portion 362 of the second fitting portion 36B and the fixing portion 362. The fixing portion 362 has a substantially semicircular contact arc portion 365 that abuts on the outer circumference of the rod 26A having a diameter Dr, and is stably fixed by abutting the rod 26A on the contact arc portion 365. The vibration generated in the rod 26A is suppressed by the substantially half circumference of the outer circumference of the rod 26A coming into contact with the contact arc portion 365. In the fixed portion 362, an overhanging portion 364 is arranged in the direction of the opening 361. Since the rod 26A cannot pass through the overhanging portion 364 unless the center spacing L26C between the rod 26A and the rod 26B is changed to the center spacing L4C, the rod 26A is fitted and fixed to the fixing portion 362 by the reaction force required for the change. It has become.

Further, when the rod 26A is fixed, the fixing portion 362 of the first fitting portion 36A has a fitting passage 363, an opening 361, and elastic deformation in the gap H2 between the rod 26A and the upper surface 202 of the battery module 203. The member 42 is arranged. The elastically deforming member 42 is elastically deformed to seal between the second spacer 32 and the upper surface 202 of the battery module 203. The elastically deforming member 42 is not provided in the passage portion formed between the second spacer 32 and the upper surface 202 of the battery module 203, and is not sealed.

The fitting passage 363 has an outer facing side surface 367 and an inner facing side surface 368 as inclined surfaces for partitioning the passage on both sides in the width direction. The fitting passage 363 is a passage having a diameter of Dr or more between the opposite side surfaces 367 and 368 in the width direction and having a size that allows the rod 26A to pass through, and allows the rod 26A that has entered through the opening 361 to pass through. It is passed through and guided to the fixed portion 362. Further, the outer facing side surface 367 constitutes a side surface on the side separated from the outer facing side surface of the fitting passage 363 of the second fitting portion 36B. The inner facing side surface 368 constitutes a side surface close to the inner facing side surface of the fitting passage 363 of the second fitting portion 36B. The fitting passage 363 has an overhanging portion 364 that has an overhang length L10 and projects in the direction of the second fitting portion 36B with respect to the width direction in the vertical path on the outer facing side surface 367. doing. Further, the overhanging portion 364 extends the contact arc portion 365 of the fixing portion 362 toward the opening 361 side. An opening end 366 is provided in the opening 361 near the outer facing side surface 367, which is the side surface of the overhanging portion 364. The distance between the opening ends 366 and the opening ends in the second fitting portion 36B is set to be longer than the distance where the center distance L26C of the rod is the center distance L4C.

Since the outer facing side surface 367 has an overhanging portion 364 between the opening portion 361 and the fixing portion 362, the outer facing side surface 367 is inclined in the vertical direction from the opening end 366 to the end point position PB. It is an inclined surface to have. The outer facing side surface 367 has an inclination angle θ1 with respect to the vertical direction when viewed from the opening end 366, for example, 30 ° or more and 50 ° or less. Since the outer facing side surface 367 is an inclined surface, the pressing force P1 in the vertical direction is applied to the rod 26A from an oblique direction, and the force P2 pushing down the rod 26A in the vertical direction and the width direction Generates a force P3 to move to. Therefore, the outer facing side surface 367 reduces the amount of pushing down of the rod 26A on the inclined surface and promotes the movement of the rod 26A in the width direction.

Further, the first fitting portion 36A has a protruding portion 369 protruding from the lower surface of the second spacer 32 with a length H3 along the outer facing side surface 367 of the fitting passage 363 in the vertical direction. There is. Since the projecting portion 369 projects from the lower surface of the second spacer 32, the opening end 366 is arranged in the direction of projecting from the lower surface, and the outer facing side surface 367 is extended in the direction of projecting from the lower surface. If the outer facing side surface 367 has an inclination angle θ1, the length in the vertical direction is increased by the protruding portion 369, so that the opening end 366 moves outward and the opening 361 expands outward. Therefore, when the restraining member 26 is to be fitted to the upper fitting portion 36, the possibility that the rod 26A comes into contact with the inside of the opening 361 is increased, and the second spacer 32 can be easily attached to the assembled battery 11. become.

The inclination angle θ1 of the inclined surface of the outer facing side surface 367, the overhang length L10 of the overhanging portion 364, and the protruding length H3 of the protruding portion 369 are adjusted so as to have an appropriate pressing force P1. The pressing force P1 is a force required by the operator to attach the second spacer 32 to the assembled battery 11, and this is preferably a specific load or less, for example, 40 N or less. That is, it is adjusted so that the force required for mounting is equal to or less than a specific load. For example, as the distance between the restraint members 26 increases from the maximum width, the force in the width direction increases. Therefore, it is preferable to reduce the angle of the inclined surface of the outer facing side surface 367. Further, when the distance between the opening portion 361 and the fixing portion 362 is short, the length of the projecting portion 369 in the vertical direction can be lengthened by lengthening the protruding length H3 of the protruding portion 369.

The width of the fitting passage 363 of the first fitting portion 36A between the second fitting portion 36B and the fitting passage 363 is the maximum width L3 or less, and the narrowest portion is the interval L4. The interval L4 is a length obtained by subtracting two overhang lengths L10 from the maximum width L3. For example, the overhang length L10 may be 20% or more of the diameter Dr, preferably 50% or less. On the other hand, since the distance between the non-opposing peripheral surfaces of the two rods 26A and 26B is the maximum width L3, when the two rods 26A and 26B pass through the fitting passage 363, the maximum width L3 is narrowed to the distance L4. Further, since the restraining member 26 restrains the pair of end plates 23 and 24 with a predetermined tension and has a tension in the stacking direction, a reaction force is also generated against an external force in a direction orthogonal to the tension. .. Therefore, the fitting passage 363 receives a predetermined reaction force from the rod 26A when the rod 26A passes through. When the rod 26A having the reaction force passes through the fitting passage 363 and reaches the fixed portion 362, the reaction force is released in a shorter time than the time required for pushing and is fitted into the fixed portion 362. It is also possible to confirm that the restraining member 26 is fitted into the fixing portion 362 due to noise or vibration.

The opening 361 is an opening having a size through which the rod 26A can pass. For example, the rod 26A has a width equal to or larger than the diameter Dr. The opening 361 includes an opening end 366 on the outer facing side surface 367. The opening end 366 is set at a position outside the position corresponding to the center C of the rod 26A in the width direction. The opening end 366 abuts on the outer circumference of the rod 26A at a position deviated outward from the apex in the vertical direction, so that the tangent line of the contact position is inclined in the width direction with respect to the pressing force P1 in the vertical direction. This causes a force component in the width direction to move the rod 26A inward.

(Action)
A case where the second spacer 32 is fitted and fixed to the restraint member 26 will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, the second spacer 32 is attached by applying a vertical pressing force P1 to the upper surface 202 side of the battery module 203.
First, the movement of the second spacer 32 in the thickness direction is restricted by the guide 204 on the upper surface 202 of the battery module 203, and the movement in the longitudinal direction is restricted by the convex portion 37 entering the concave portion 205. As a result, the first fitting portion 36A is positioned with respect to one rod 26A, and the second fitting portion 36B is positioned with respect to the other rod 26B.

As shown in FIG. 4, when the second spacer 32 is moved in the direction of the battery module 203 while being positioned in the left-right direction in the drawing, the restraint member 26 is placed on the upper fitting portion 36 of the second spacer 32. Contact. For example, the rod 26A faces the opening 361 of the first fitting portion 36A, and the contact position PA on the outer peripheral surface of the rod 26A contacts the opening end 366 of the opening 361. Since the contact position PA on the outer peripheral surface of the rod 26A is on an arc, the tangent to the opening end 366 has an inclination in the vertical direction. For example, the outer peripheral surface of the rod 26A has a tangent line at the contact position PA that is parallel to the direction in which the arrow P22 having the inclination angle θ1 extends in the vertical direction.

When the pressing force P1 is applied to the second spacer 32 in this state, the outer peripheral surface of the rod 26A generates a reaction force R2 with respect to the force P21 applied from the opening end 366 at the contact position PA. Since the force P21 has an inclination θ2 with respect to the pressing force P1, a component force is generated between the force P2 in the direction of pushing down the rod 26A and the force P3 for moving the rod 26A inward. Therefore, since the force P2 in the direction of pushing down the rod 26A is smaller than the pushing pressure P1, the amount of pushing down the rod 26A is reduced. Therefore, the decrease of the gap H2 between the upper surface 202 of the battery module 203 is suppressed, and the distance between the second spacer 32 and the upper surface 202 of the battery module 203 is secured.

Further, the rod 26A moves inward PH. Since the reaction force from the rod 26A to the force P3 that moves the rod 26A inward generated when the second spacer 32 is pushed down is applied in the width direction of the second spacer 32, the force required for the pushing pressure P1 is small. As a result, the increase in the pressing force P1 is suppressed.

In the second spacer 32, when the rod 26A moves the fitting passage 363 from the contact position PA toward the end point position PB, the distance between the rods 26A is narrowed and the reaction force increases, so that the pressing force in the width direction is increased. Although P5 increases, since the pressing force P5 is a force in the width direction, the reaction force R4 generated in the vertical direction is suppressed to be small, so that the increase in the pressing force P1 is suppressed.

In the fitting passage 363, the distance between the non-opposing peripheral surfaces of the restraint member 26 is the minimum distance L4, so that the pressing force P5 in the width direction becomes the maximum. When the outer outer circumference of the rod 26A passes through the end point position PB, the direction of the tangent line of the outer peripheral side surface of the rod 26A with respect to the contact arc portion 365 is tilted in the vertical direction, and the reaction force of the rod 26A in the width direction is the direction in which the rod 26A spreads. And, it acts as a force to move upward. As a result, the rod 26A is fitted into the fixing portion 362 and fixed by the action of the reaction force.

In order to remove the rod 26A from the fixing portion 362, a vertical force for crossing the end point position PB must be applied to the second spacer 32, but the pressing force P5 in the width direction is large. , It is not easy, and it will be fitted stably.

As described above, according to the battery pack spacer and the battery pack of the present embodiment, the effects described below can be obtained.
(1) The first spacer 31 and the second spacer 32 can be different from each other in the vertical direction in a direction in which the rods escape in a direction including a direction (width direction) in which the distance between the rods is changed. Therefore, when the first spacer 31 pressed against the rods 25A and 25B is pushed in, the amount of elastic deformation of the rods 25A and 25B in the vertical direction is reduced. That is, the amount of pushing the first spacer 31 in order to fit the rods 25A and 25B into the fixed portion of the first spacer 31 is reduced. Further, when the second spacer 32 pressed against the rods 26A and 26B is pushed in, the amount of elastic deformation of the rods 26A and 26B in the vertical direction is reduced. That is, the amount of pushing the second spacer 32 in order to fit the rods 26A and 26B into the fixing portion 362 of the second spacer 32 is reduced. Therefore, the time and effort required to attach the first spacer 31 and the second spacer 32 to the assembled battery 11 can be reduced.

(2) In the overhanging portion 364, the overhanging length L10 extending in the width direction (the direction in which the first interval extends) is 20% or more of the diameter Dr of the rods 26A and 26B (25A and 25B), and the overhanging portion 364 is formed. By setting the length to 50% or less, the pair of rods 26A, 26B (25A, 25B) can be bent in the width direction with an appropriate force.

(3) Since the distance L4 (L2) between the side surfaces of the fitting passage 363 on the mutually distant sides is narrower than the distance between the pair of rods with the maximum width L3 (L1), in the width direction. By bending the pair of rods 26A, 26B (25A, 25B) so as to approach each other, the amount of movement in the vertical direction is reduced.

(4) When the overhanging portion 364 narrows the distance between the pair of rods 26A, 26B (25A, 25B), the distance between the opening ends 366 of the opening 361 is the distance between the rods L4 (L2). It is secured at a longer distance than. Therefore, when the two openings 361 of the second spacer 32 (first spacer 31) are opposed to the pair of rods 26A, 26B (25A, 25B), the opening ends 366 of each opening 361 are paired rods. It is located on the outer side of the 26A, 26B (25A, 25B) and comes into contact with the outer peripheral surfaces of the pair of rods 26A, 26B (25A, 25B). Then, when the second spacer 32 (first spacer 31) is pressed, a force is applied to the pair of rods 26A, 26B (25A, 25B) so as to move inward. As a result, the pair of rods 26A, 26B (25A, 25B) in the opening 361 are promoted to be deformed in the approaching direction guided by the overhanging portion 364, and the pair of the second spacer 32 (first spacer 31) is paired. It becomes easy to attach to the rods 26A and 26B (25A and 25B).

(5) Since the pushing force is appropriately distributed by the outer facing side surface 367, the pushing force P1 (P11) applied to the second spacer 32 (first spacer 31) is appropriately applied to the opening. Each rod 26A, 26B (25A, 25B) in contact with the 361 can be appropriately elastically deformed in the vertical direction and the width direction.

(6) Since the protruding portion 369 has an outer facing side surface 367 (inclined surface) on the side narrower than the maximum width L3, the center spacing L3C of the rod 26A and the center spacing L4C passing through the fitting passage are different. Even so, the rod 26A that has entered through the opening 361 can easily move along the inclined surface in the fitting passage 363.

(7) By shortening the distance of the supply passage 14 through which the inflowing cooling air passes, the cooling air is evenly supplied to each ventilation passage 21, and the battery pack 10 can be suitably cooled.
(8) Since the outflow passage 15 of the cooling air is also partitioned, the flow distance of the outflowing cooling air is shortened, and the cooling air flows more evenly.

(Other embodiments)
The above embodiment can also be implemented in the following embodiments.
In the above embodiment, the case where the second spacer 32 is attached to the assembled battery 11 with the upper fitting portion 36 narrowing the maximum width L26 of the two rods 26A and 26B has been illustrated. However, the present invention is not limited to this, and the second spacer 32 may be attached to the assembled battery 11 so as to widen the distance between the two rods 26A and 26B at the upper fitting portion 36.

For example, as shown in FIG. 5, the upper fitting portion 136 of the second spacer 32 has a first fitting portion 136A and a second fitting portion 136B corresponding to the two rods 26A and 26B. .. The first fitting portion 136A and the second fitting portion 136B are side surfaces of the fitting passage, and each has an overhanging portion on the side surface close to each other. The distance between the two overhanging portions is set to a length L14 wider than the minimum width L13 corresponding to the minimum width L261 which is the distance between the facing peripheral surfaces (opposing peripheral surfaces) of the two rods 26A and 26B. ing. As a result, when the restraint member 26 is attached to the upper fitting portion 136, the distance between the opening and the overhanging portion is widened from the minimum width L261 to the length L14. Then, the rods 26A and 26B of the restraint member 26 are fitted to the first fitting portion 136A and the second fitting portion 136A by the reaction force inward of the restraint member 26 at a position where the distance between the restraint members 26 exceeds the length L14. It will be fitted and fixed to each of the fixing portions with the portion 136B.

Further, in the above embodiment, the case where the first spacer 31 is attached to the assembled battery 11 with the lower fitting portion 35 narrowing the maximum width L25 of the two rods 25A and 25B has been illustrated. However, the present invention is not limited to this, and the first spacer 31 may be attached to the assembled battery 11 so as to widen the distance between the two rods 25A and 25B at the lower fitting portion 35.

For example, as shown in FIG. 5, the lower fitting portion 135 of the first spacer 31 has a first fitting portion 135A and a second fitting portion 135B corresponding to the two rods 25A and 25B. There is. The first fitting portion 135A and the second fitting portion 135B are side surfaces of the fitting passage, and each has an overhanging portion on the side surface close to each other. The distance between the two overhangs is set to a distance L12 wider than the minimum width L11 corresponding to the inner minimum width L251 of the distance between the two rods 25A and 25B. As a result, when the restraint member 25 is attached to the lower fitting portion 135, the distance between the opening and the overhanging portion is widened from the minimum width L251 to the distance L12. As a result, the rods 25A and 25B of the restraining member 25 are moved into the first fitting portion 135A and the second fitting portion 135B by the reaction force inward of the restraining member 25 at the position where the restraining member 25 exceeds the interval L12. It comes to be fitted and fixed to each of the fixing portions with and.

According to the two other embodiments described above, the distance between the side surfaces of the fitting passage 363 on the side close to each other is wider than the distance between the pair of rods having the minimum widths L11 and L13. Therefore, the amount of movement in the vertical direction is reduced by bending the pair of rods 25A, 25B (26A, 26B) so as to separate from each other in the width direction.

Further, when the overhanging portion 364 widens the distance between the pair of rods 25A, 25B (26A, 26B), the distance between the opening ends 366 of the opening 361 is the distance between the rods L12 (L14). It is secured at a shorter distance than it is. Therefore, the opening ends 366 of the two openings 361 of the first spacer 31 (second spacer 32) are located inside the pair of rods 25A, 25B (26A, 26B), and the pair of rods 25A, 25B ( It abuts on the inner peripheral surface of 26A, 26B). Then, when the first spacer 31 (second spacer 32) is pressed in the vertical direction, a force is applied to the pair of rods 25A, 25B (26A, 26B) so as to move outward. As a result, in the opening 361, the pair of rods 25A, 25B (26A, 26B) is promoted to be deformed in the direction away from the overhanging portion 364, and the pair of the first spacers 31 (second spacers 32) is paired. Can be easily attached to the rods 25A and 25B (26A and 26B).

Further, the first spacer 31 is attached to the assembled battery 11 so as to widen the center distance L25C of the two rods 25A and 25B at the lower fitting portion 35, and the second spacer 32 is attached to the assembled battery 11 at the upper fitting portion 36. The two rods 26A and 26B may be attached to the assembled battery 11 so as to narrow the center distance L26C.

On the contrary, the first spacer 31 is attached to the assembled battery 11 so as to narrow the center distance L25C between the two rods 25A and 25B at the lower fitting portion 35, and the second spacer 32 is attached to the upper fitting portion. It may be attached to the assembled battery 11 so as to widen the center distance L26C of the two rods 26A and 26B at 36.

-The second spacer 32 does not have to have the convex portion 37.
In the above embodiment, the case where the two rods 25A and 25B and the two rods 26A and 26B are simultaneously fitted into the corresponding upper fitting portion 36 and lower fitting portion 35 has been illustrated. However, not limited to this, the two rods 25A and 25B and the two rods 26A and 26B are first fitted into one fitting portion to which one of the rods corresponds, and then the other rod to which the other rod corresponds to. It may be fitted in the fitting portion of.

In the above embodiment, the case where the opening end 366 of each opening 361 comes into contact with the pair of rods 26A, 26B (25A, 25B) is illustrated, but the present invention is not limited to this, and the position where the opening end 366 is separated in the width direction is not limited to this. The rod may extend to and directly contact the side of the mating passage.

In the above embodiment, the first fitting portion 35A and the second fitting portion 35B of the first spacer 31 and the first fitting portion 36A and the second fitting portion of the second spacer 32 are used. All 36B examples have the same shape (symmetrical shape). However, the present invention is not limited to this, and each fitting portion has a shape of a fitting passage or an overhang as long as the shape of the fitting portion can be widened or narrowed when the restraining member is attached. The shape of the portion may be slightly different.

-In the above embodiment, in particular, the restraint members 25 and 26 have been exemplified in the case where the middle of the stacking direction is fitted to the lower fitting portion 35 and the upper fitting portion 36, but the present invention is not limited to this. As for the member, the lower fitting portion and the upper fitting portion may be fitted closer to the end plate than in the middle of the stacking direction. This also suppresses the resonance of the rod.

The rods 25A, 25B, 26A, and 26B may be fastened to the end plates 23 and 24 without loosening with screws or the like, or may be fitted and fastened with a slight gap. Although the fitting stopper is easy to attach, some gaps may easily cause resonance, but even such resonance is suppressed by attaching the first spacer or the second spacer. As a result, the degree of freedom in attaching the first spacer and the second spacer can be increased.

-In the above embodiment, the case where the first fitting portion 36A has the protruding portion 369 is illustrated. However, the present invention is not limited to this, and the first and second fitting portions may not have a protruding portion. For example, if there is a sufficient section between the opening and the fixed portion, there may be no protruding portion, and conversely, the opening may be slightly dented with respect to the facing surface and the opening may be retracted with respect to the facing surface. You may be allowed to.

-In the above embodiment, the case where the inclination angle θ1 is, for example, 30 ° or more and 50 ° or less is illustrated, but the present invention is not limited to this, and the inclination angle is 0 ° or more and less than 90 °. good. Further, when the apex of the overhanging portion 364 is in the middle of the fitting passage 363 with respect to the vertical direction, the angle on the fixed portion 362 side with respect to the apex of the overhanging portion 364 may be 0 ° or less.

In the above embodiment, the maximum width L1 which is the distance between the first fitting portion 35A and the second fitting portion 35B and the distance between the non-opposing peripheral surfaces of the two rods 25A and 25B of the restraining member 25 The case where the maximum width L25 and the maximum width L25 are the same interval is illustrated. However, the present invention is not limited to this, and the maximum width, which is the distance between the first fitting portion and the second fitting portion, may be narrower than the maximum width, which is the distance between the non-opposing peripheral surfaces of the restraining member. As a result, each rod is fitted and fixed to each fitting portion so as to suppress resonance.

It is also possible that the maximum width L3, which is the distance between the first and second fitting portions 36A and 36B, and the maximum width L26, which is the distance between the non-opposing peripheral surfaces of the restraint member 26, are the same. Similarly, the maximum width, which is the distance between the first fitting portion and the second fitting portion, may be narrower than the maximum width, which is the distance between the non-opposing peripheral surfaces of the restraining member.

-In the above embodiment, the case where the second spacer 32 is provided in the outflow passage 15 has been illustrated, but the present invention is not limited to this, and the outflow passage may not be provided with the second spacer.
-In the above embodiment, the case where the first spacer 31 is provided in the supply passage 14 has been illustrated, but the present invention is not limited to this, and the supply passage may not be provided with the first spacer.

-In the above embodiment, the case where the cooling air is supplied to the supply passage 14 has been illustrated, but the cooling air may be another gas capable of cooling the battery module 20.
-In the above embodiment, the case where the battery module 20 is a lithium ion secondary battery or a nickel hydrogen secondary battery has been illustrated, but the present invention is not limited to this, and other secondary batteries may be used.

-In the above embodiment, the case where the battery pack 10 is mounted on an electric vehicle or a hybrid vehicle has been illustrated, but the present invention is not limited to this, and the secondary battery may be mounted on a vehicle such as a gasoline vehicle or a diesel vehicle. Further, the secondary battery may be used as a power source for a mobile body or a fixed installation. For example, the application destination of the power source includes a moving body such as a railroad, a ship, an aircraft or a robot, an electric product such as an information processing device, and the like.

10 ... Battery pack, 11 ... Assembled battery, 12 ... External case, 14 ... Supply passage, 14A, 14B ... Area, 15 ... Outflow passage, 15A, 15B ... Area, 20 ... Battery module, 21 ... Ventilation passage, 23, 24 ... end plate, 25 ... restraint member, 25A, 25B ... rod, 26 ... restraint member, 26A, 26B ... rod, 31 ... first spacer, 32 ... second spacer, 35 ... lower fitting portion, 35A ... first fitting portion, 35B ... second fitting portion, 36 ... upper fitting portion, 36A ... first fitting portion, 36B ... second fitting portion, 37 ... convex portion, 41, 42 ... Elastically deformable member, 111 ... Lower surface, 112 ... Upper surface, 121 ... Lower case, 122 ... Upper case, 123, 124 ... Inner surface, 135 ... Lower fitting portion, 135A ... First fitting portion, 135B ... Second Fitting part, 136 ... Upper fitting part, 136A ... First fitting part, 136B ... Second fitting part, 201 ... Lower surface, 202 ... Upper surface, 203 ... Battery module, 204 ... Guide, 205 ... Recessed portion , 251,261 ... Rod fastening part, 361 ... Opening, 362 ... Fixed part, 363 ... Fitting passage, 364 ... Overhanging part, 365 ... Contact arc part, 366 ... Opening end, 376 ... Opposing side surface, 368 ... Opposing side surface, 369 ... Protruding part.

Claims (11)

A battery pack spacer that partitions an air flow passage formed between the assembled battery and the case in a battery pack containing the assembled battery in a case.
The assembled battery includes a pair of end plates that sandwich the plurality of battery modules at both ends in the stacking direction in which a plurality of battery modules are closely stacked in the thickness direction, and the pair of end plates that extend in the stacking direction. A plane including a plurality of rods that mutually restrain the batteries and a pair of rods that are parallel to each other at a first distance among the plurality of rods and that is parallel to one side surface of the assembled battery. Have,
The air flow passage is provided between one side surface of the assembled battery and the case.
The battery pack spacer is a groove extending in the stacking direction on a surface facing one side surface of the assembled battery, and is a first fitting portion and a second fitting portion into which the pair of rods are fitted. With
The first fitting portion and the second fitting portion include an opening that opens to the facing surface, a fixing portion that includes the bottom surface of the groove and into which the pair of rods are fitted and fixed, and the opening. It is provided with a fitting passage from the portion to the fixed portion.
The fitting passage of the first fitting portion and the fitting passage of the second fitting portion are on the side surfaces of the two fitting passages on the side close to each other or on the side separated from each other, respectively. A spacer for a battery pack provided with an overhanging portion on the side surface so that the first distance between the pair of rods passing through the fitting passage is set to a second distance different from the first distance. The first aspect of claim 1, wherein the overhanging portion has a length overhanging in the extending direction of the first interval set to a length of 20% or more and 50% or less of the diameter of the rod. Spacer for battery pack. The battery pack spacer according to claim 1 or 2, wherein the overhanging portion is provided on the side surfaces of the fitting passage on the mutually distant sides. Wherein the first of the opening of the opening portion and the second fitting portion of the fitting portion, wherein during mutual distance of the open end close to an aspect of the overhanging portion of the front Stories second septum battery pack spacer of claim 3 by remote is set to a long distance. The battery pack spacer according to claim 1 or 2, wherein the overhanging portion is provided on the side surface of the fitting passage on the side close to each other. Wherein the first of the opening of the opening portion and the second fitting portion of the fitting portion, wherein during mutual distance of the open end close to an aspect of the overhanging portion of the front Stories second septum battery pack spacer of claim 5 which is set in by remote short distance. Any one of claims 1 to 6, wherein the overhanging portion of the fitting passage has an inclined surface having an inclination of 30 ° or more and 50 ° or less with respect to a direction perpendicular to one side surface of the assembled battery. Battery pack spacers as described in the section. The fitting passage has a projecting portion that projects an open end close to the overhanging portion in the direction of one side surface of the assembled battery, and the inclined surface extends to the projecting portion according to claim 7. Spacer for battery pack. It is a battery pack that contains the assembled batteries in a case.
The assembled battery includes a pair of end plates that sandwich the plurality of battery modules at both ends in the stacking direction in which a plurality of battery modules are closely stacked in the thickness direction, and the pair of end plates that extend in the stacking direction. A plane including a plurality of rods that mutually restrain the batteries and a pair of rods that are parallel to each other at a first distance among the plurality of rods and that is parallel to one side surface of the assembled battery. Have,
A battery pack spacer for partitioning an air flow passage formed between one side surface of the assembled battery and the case is provided.
The battery pack spacer is a groove extending in the stacking direction on a surface facing one side surface of the assembled battery, and is a first fitting portion and a second fitting portion into which the pair of rods are fitted. With
The first fitting part and said second fitting portion, the opening portion that is opened in the facing surface, the fixed portion to which the pair of rods include a bottom of the groove is fitted and fixed, said opening It is provided with a fitting passage from the portion to the fixed portion.
The fitting passage of the first fitting portion and the fitting passage of the second fitting portion are on the side surfaces of the two fitting passages on the side close to each other or on the side separated from each other, respectively. A battery pack comprising an overhang portion on a side surface that makes the first distance between the pair of rods passing through the fitting passage a second distance different from the first distance. The battery pack according to claim 9, wherein the air flow passage is a passage through which cooling air flows. The assembled battery has an outflow passage for allowing cooling air to flow out on the other side surface opposite to the one side surface, and has another pair of rods among the plurality of rods on the other side surface.
The battery according to claim 9 or 10, further comprising a battery pack spacer that partitions the outflow passage formed between the other side surface of the assembled battery and the case, and is fitted to the other pair of rods. pack.

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