JP6024895B2 - Automotive battery pack - Google Patents

Description

  The present invention relates to an in-vehicle battery pack mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle.

  The electric vehicle is equipped with a battery pack for driving the traveling motor. In recent years, the capacity of in-vehicle battery packs has been increasing, and various structures have been proposed accordingly. For example, there is a battery pack tray in which a battery module including a plurality of battery cells is accommodated, and each battery module is fixed to the battery pack tray by a battery module holder (see Patent Document 1). In Patent Document 1, the battery module holder is fixed to the battery pack tray by screwing the flange portion of the battery module holder into the screw portion on the upper end side of the holder nut.

  With such a configuration, the battery module can be satisfactorily fixed to the battery pack tray.

JP 2012-101663 A

  By the way, as one of the causes of damage of the battery pack or the battery cell accommodated in the battery pack, for example, the battery module may be moved due to a reaction when the vehicle collides with an obstacle or the like. That is, when the battery module moves, the battery module collides with a battery tray (corresponding to a battery pack tray) or the like and is damaged, and accordingly, the battery cells constituting the battery module may be damaged.

  For this reason, it is desirable that the battery module is fixed to the battery tray so that the amount of movement of the battery module due to the reaction or the like is as small as possible. Even if it is the structure of the said patent document 1, although the movement of a battery module can be suppressed, the further improvement is desired.

  This invention is made | formed in view of such a situation, and it aims at providing the vehicle-mounted battery pack which suppressed the movement of the battery module by reaction etc. at the time of a vehicle collision.

  A first aspect of the present invention that solves the above-described problem is an on-vehicle vehicle that includes a battery tray having a housing portion that houses a plurality of battery modules, and a first bracket member that fixes the battery modules to the battery tray. The battery tray includes a columnar fixing member that is erected around the housing portion, and one end side of the first bracket member is a first fastening member on the fixing member. And has a second bracket member fixed to the battery module on the other end side, and having the engagement hole into which the fixing member is inserted. The vehicle-mounted battery pack is characterized in that a predetermined gap is secured between the engagement hole and the fixing member.

  In the first aspect, by providing the second bracket member, the movement of the battery module due to the reaction at the time of the vehicle collision is suppressed. That is, the movement of the second bracket member is restricted by the engaging member to be engaged, and as a result, the movement of the battery module is also suppressed. In addition, since a gap is secured between the engagement hole and the fixing member, the battery module can be satisfactorily fixed to the battery tray even if there is some dimensional error, and the reaction at the time of a vehicle collision The movement of the battery module due to, for example, can also be suppressed.

  According to a second aspect of the present invention, in the on-vehicle battery pack according to the first aspect, the other end side of the first bracket member is fixed to an upper portion of the battery module, and the other end side of the second bracket member. Is fixed to the lower part of the battery module.

  In the second aspect, the battery module can be relatively easily fixed to the battery tray by the first bracket member, and the battery module can be fixed by the second bracket member due to a reaction or the like at the time of a vehicle collision. Movement can be suppressed.

According to a third aspect of the present invention, in the in-vehicle battery pack according to the first or second aspect, the fixing member is positioned on the opposite side of the battery module from the center of the engagement hole. It is in the vehicle-mounted battery pack characterized by being inserted.

  In the third aspect, the second bracket member comes into contact with the fixing member when a reaction at the time of a vehicle collision occurs, thereby preventing the first bracket member and the fixing member from colliding with the battery module. be able to.

  According to a fourth aspect of the present invention, in the on-vehicle battery pack according to any one of the first to third aspects, a linear distance between the engagement hole of the second bracket member and a fixed portion of the battery module is set. The vehicle-mounted battery pack is characterized in that it is shorter than a linear distance between a fixed portion of the first bracket member to the fixing member and a fixed portion of the battery module.

  In the fourth aspect, the second bracket member comes into contact with the fixing member when a reaction at the time of a vehicle collision occurs, so that the first bracket member and the fixing member can more reliably collide with the battery module. Can be suppressed.

  According to a fifth aspect of the present invention, in the in-vehicle battery pack according to any one of the first to fourth aspects, the other end side of the first bracket member is fixed to the battery module by a second fastening member, The other end side of the second bracket member is fixed to the battery module by welding.

  In the fifth aspect, the fixing force of the battery module to the battery tray can be increased by fixing the first bracket member to the battery module by the second fastening member, while the second bracket member and the battery Since the fixing structure with the module can be configured in a space-saving manner, an increase in the size of the battery tray housing portion can be prevented.

  In such an in-vehicle battery pack according to the present invention, by including the second bracket member together with the first bracket member, the movement of the battery module due to the reaction or the like at the time of the vehicle collision is suppressed, and the damage of the battery module is suppressed. Can do.

It is a schematic perspective view which shows the battery pack mounted in an electric vehicle. It is a top view which shows the inside of the battery pack which concerns on one Embodiment of this invention. 3 is a cross-sectional view of a battery pack according to an embodiment of the present invention, and is a cross-sectional view taken along the line AA ′ of FIG. It is a disassembled perspective view which shows typically the fixation structure of the module case and battery tray which concern on one Embodiment of this invention. It is a top view which shows the movement state of the battery module at the time of front collision occurring. It is a schematic diagram which shows the movement state of the battery module when a front collision has occurred.

  As shown in FIG. 1, an in-vehicle battery pack (hereinafter simply referred to as a battery pack) 10 on which a secondary battery (battery) according to the present invention is mounted is, for example, a bottom portion (floor) of an electric vehicle 1 such as an electric vehicle. It is mounted on the bottom and supplies electric power to the driving motor of the electric vehicle 1.

  As shown in FIGS. 2 and 3, the battery pack 10 includes a battery module 30 including a plurality of battery cells 20 and a battery case 40 in which the battery module 30 is accommodated.

  The battery module 30 includes a plurality of battery cells 20 and a module case 31 in which the plurality of battery cells 20 are accommodated. In the present embodiment, eight battery cells 20 are accommodated in the module case 31. Although the arrangement of the battery cells 20 is not particularly limited, in the present embodiment, the battery cells 20 are provided in two rows in the front-rear direction of the vehicle 1 in the module case 31 and are stacked four by four in the vertical direction. The number and arrangement of the battery modules 30 housed in the battery case 40 are not particularly limited.

  The module case 31 is formed of, for example, a sheet metal, and includes an upper surface portion 32 and a lower surface portion 33, and a side surface portion 34 that connects the upper surface portion 32 and the lower surface portion 33. That is, the module case 31 is provided so as to surround the four surfaces around the battery cell 20 in the front-rear direction of the vehicle 1. The remaining two surfaces are openings 35, and the battery cells 20 are inserted into the module case 31 through the openings 35 (see FIG. 4).

  The battery case 40 is a container that houses the battery module 30, and includes a battery tray 41 and a battery cover 42. The battery tray 41 constitutes the lower part of the battery case 40, and the battery cover 42 constitutes the upper part of the battery case 40. That is, the battery module 30 is accommodated in a space formed by the battery tray 41 and the battery cover 42.

  In the present embodiment, two partition walls 44 are erected on the bottom 43 of the battery tray 41, and three storage portions 45 partitioned by these partition walls 44 are formed in the battery tray 41. The battery module 30 is accommodated in each accommodating portion 45. That is, three battery modules 30 are arranged and accommodated in the battery tray 41 in a line in the left-right direction of the vehicle 1.

  Each battery module 30 accommodated in the accommodating portion 45 in this way is fixed to the battery tray 41 via the first bracket member 50. Hereinafter, a fixing structure between the battery module 30 and the battery tray 41 will be described.

  As shown in FIGS. 2 to 4, ribs 47 are formed at the four corners of each accommodating portion 45 in the battery tray 41, and a columnar, for example, columnar fixing member 70 is formed inside each rib 47. It is erected. The battery tray 41 is made of, for example, a resin material, and a fixing member 70 made of, for example, a metal material is provided in the rib 47 by integral molding. The fixing member 70 is provided so as to penetrate the rib 47 in the vertical direction, and an upper end thereof protrudes upward from the surface of the rib 47. A female screw hole 71 is formed at the upper end of the fixing member 70. The first bracket member 50 is a substantially L-shaped member formed of, for example, a sheet metal, and a through hole 51 is formed in the vicinity of the end on the battery tray 41 side, which is one end side. The first bracket member 50 is fixed to the battery tray 41 by screwing a bolt (first fastening member) 80 into the female screw hole 71 of the fixing member 70 through the through hole 51.

  On the other hand, two male screw portions 37 are provided projecting sideways at the upper portion of the side surface portion 34 of the module case 31 constituting the battery module 30. Further, two through holes 52 corresponding to the respective male screw portions 37 are formed in the vicinity of the end portion on the module case 31 side which is the other end side of the first bracket member 50. The first bracket member 50 is fixed to the module case 31 by screwing the nut 90 into the male screw portion (second fastening member) 37 inserted into each through hole 52.

  Thus, by fixing each battery module 30 to the battery tray 41 via the first bracket member 50, the position of the battery module 30 and the battery tray 41 can be finely adjusted even if there is some dimensional error. The battery module 30 can be fixed to the battery tray 41 satisfactorily. In addition, since one end side of the first bracket member 50 is formed on the upper portion of the side surface portion 34, the battery module 30 is placed in the battery tray without the first bracket member 50 interfering with the partition wall 44, the rib 47, and the like. 41 can be fixed satisfactorily.

  Further, each battery module 30 is connected to the module case 31 by the second bracket member 100. The second bracket member 100 is a substantially L-shaped member formed of a sheet metal like the first bracket member 50, and one end side thereof engages with the fixing member 70 and the other end side is a module case 31. It is being fixed to the side part 34 of this. Specifically, an engagement hole 101 is formed near the end of the second bracket member 100 on the battery tray 41 side, and the fixing member 70 is inserted into the engagement hole 101. The first bracket member 50 is fixed to the upper end portion of the fixing member 70 as described above in a state where the fixing member 70 is inserted into the engagement hole 101 in this way. Further, the other end side of the second bracket member 100 is fixed to the lower part of the side surface portion 34 of the module case 31 by, for example, welding or the like and integrated with the module case 31. For this reason, the battery module 30 can be easily accommodated in each accommodating portion 45.

  Thus, the second bracket member 100 is integrated with the module case 31 and is engaged with the fixing member 70 (battery tray 41) without being fixed to the battery tray 41 or the fixing member 70. . That is, the battery module 30 is fixed to the fixing member 70 (battery tray 41) by the first bracket member 50 while being engaged with the fixing member 70 by the second bracket member 100.

  Therefore, with such a configuration, it is possible to suppress damage to the battery module 30 (battery cell 20) even when the vehicle 1 has a forward collision. That is, in the battery pack 10 of the present invention, since the battery module 30 is engaged with the battery tray 41 (fixing member 70) by the second bracket member 100, the forward movement of the battery module 30 at the time of a forward collision is suppressed. can do. As a result, damage to the battery module 30 (battery cell 20) can be suppressed.

  Here, the engagement hole 101 of the second bracket member 100 is formed with a diameter larger than the outer diameter of the fixing member 70, and a predetermined distance is provided between the end surface of the engagement hole 101 and the fixing member 70. A gap is secured. Thereby, even when there is a slight dimensional error when fixing the battery module 30 to the battery tray 41, the battery module 30 can be well positioned and accommodated in each accommodating portion 45. The shape and size of the engagement hole 101 are not particularly limited, and the engagement hole 101 may be, for example, a circle. In the present embodiment, the engagement hole 101 is long in the front-rear direction of the vehicle 1. It is formed in the hole.

  The positional relationship between each engagement hole 101 and the fixing member 70 is not particularly limited, but the fixing member 70 is located outside the center of the engagement hole 101 in the front-rear direction of the vehicle 1 (on the side opposite to the battery module 30). ). With this configuration, for example, as shown in FIG. 5A, the distance D1 between the engagement hole 101 of the second bracket member 100A and the rear end of the fixing member 70 on the vehicle rear side is the vehicle. It becomes shorter than the distance D2 between the rear end of the engagement hole 101 of the second bracket member 100B and the rear end of the fixing member 70 on the front side. In FIG. 5, the first bracket member is not shown.

Thereby, for example, when the battery module 30 tries to move to the vehicle front side due to the reaction of a frontal collision of the vehicle 1, as shown in FIG. 5B, the second bracket member 100B (engagement hole) on the vehicle front side is shown. The second bracket member 100A on the rear side of the vehicle comes into contact with the fixing member 70 before the rear end (101) comes into contact with the fixing member 70, and the movement of the battery module 30 toward the front side of the vehicle is restricted. That is, damage to the battery module 30 (battery cell 20) due to the second bracket member 100B (the rear end of the engagement hole 101) on the vehicle front side coming into contact with the fixing member 70 can be suppressed.

  Further, when the second bracket member 100A on the vehicle rear side contacts the fixing member 70 and then moves further to the vehicle front side of the battery module 30, for example, as shown in the schematic diagram of FIG. The module case 31 is pulled by the second bracket member 100A. Due to the deformation of the module case 31, the internal battery cell 20 may receive pressure in the vertical direction. However, in this case, since the module case 31 is deformed as a whole, the pressure (impact) applied to each battery cell 20 is dispersed. For this reason, the damage of the battery cell 20 is suppressed.

  The linear distance D3 between the engagement hole 101 (rear end position) P1 of the second bracket member 100 and the fixing portion (fixed position) P2 of the module case 31 is the distance from the fixing member 70 of the first bracket member 50. It is preferably shorter than the linear distance D4 between the fixed portion (fixed position) P3 and the fixed portion (fixed position) P4 between the module case 31 (see FIG. 3).

  Thereby, the movement of the battery module 30 can be more reliably suppressed by the second bracket member 100. That is, when a forward collision occurs in the vehicle 1, the battery module 30 is prevented from moving forward by the second bracket member 100 coming into contact with the fixing member 70 before the first bracket member 50 is fully extended. The Therefore, the movement amount of the battery module 30 toward the front side of the vehicle can be further reduced.

  Further, as described above, the other end side of the first bracket member 50 is fixed to the module case 31 by the male screw portion 37, and the other end side of the second bracket member 100 is fixed to the module case 31 by welding. preferable.

  Thereby, while the fixing force of the battery module 30 to the battery tray 41 can be increased by the first bracket member 50, the fixing structure of the second bracket member 100 and the battery module 30 can be configured in a space-saving manner. An increase in the size of the accommodating portion 45 of the battery tray 41 can be prevented.

  In addition, although this embodiment demonstrated the effect when the front collision occurred, the structure of this embodiment also has the same effect when the rear collision occurs.

  Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment.

  For example, in the above-described embodiment, the configuration in which the first and second bracket members 50 and 100 are provided on the front side and the rear side of the vehicle 1 is illustrated, but the first and second bracket members 50 and 100 are illustrated. May be provided on the left and right sides of the vehicle 1. In this case, when a side collision occurs in the vehicle 1, damage to the battery module 30 (battery cell 20) can be suppressed as described above.

  Further, the present invention can be applied not only to a battery pack mounted on an electric vehicle, but also to a battery pack mounted on another electric vehicle such as a hybrid vehicle.

DESCRIPTION OF SYMBOLS 1 Electric vehicle 10 Battery pack 20 Battery cell 30 Battery module 31 Module case 32 Upper surface part 33 Lower surface part 34 Side part 35 Opening 37 Male screw part 40 Battery case 41 Battery tray 42 Battery cover 43 Bottom part 44 Partition wall 45 Housing part 47 Rib 50 1 bracket member 51, 52 through hole 70 fixing member 71 female screw hole 80 bolt 90 nut 100 second bracket member 101 engagement hole

Claims (5)

A battery tray having an accommodating portion for accommodating a plurality of battery modules;
A first bracket member for fixing the battery module to the battery tray;
An in-vehicle battery pack comprising:
The battery tray has a columnar fixing member erected around the housing portion, and one end side of the first bracket member is fixed on the fixing member by a first fastening member,
It has an engagement hole into which the fixing member is inserted on one end side, and has a second bracket member on the other end side fixed to the battery module,
The engagement hole is formed with a diameter larger than the diameter of the fixing member, and a predetermined gap is secured between the engagement hole and the fixing member. pack. The in-vehicle battery pack according to claim 1,
The in-vehicle battery pack, wherein the other end side of the first bracket member is fixed to the upper part of the battery module, and the other end side of the second bracket member is fixed to the lower part of the battery module. . The in-vehicle battery pack according to claim 1 or 2,
The in-vehicle battery pack, wherein the fixing member is inserted into the engaging hole so that the fixing member is located on the opposite side of the battery module from the center of the engaging hole. In the vehicle battery pack according to any one of claims 1 to 3,
The linear distance between the engagement hole of the second bracket member and the fixed portion of the battery module is a straight line between the fixed portion of the first bracket member and the fixed portion of the battery module. An in-vehicle battery pack characterized by being shorter than the distance. In the vehicle battery pack according to any one of claims 1 to 4,
The other end side of the first bracket member is fixed to the battery module by a second fastening member, and the other end side of the second bracket member is fixed to the battery module by welding. Automotive battery pack.

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