JP6103192B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack in which battery modules are stacked in a vertical direction.

  Examples of the battery pack having the battery modules stacked and arranged in the vertical direction include a secondary battery device described in Patent Document 1. The secondary battery device described in Patent Document 1 includes a plurality of battery stack assemblies. The battery stack assembly includes a floor plate, a back plate erected from the floor plate, and a base plate fixed on the floor plate. A battery module is placed on the base plate. The battery module is in contact with the back plate. A side plate is erected on the edge of the base plate so as to sandwich the battery module. A base plate, a side plate, and a back plate are provided on the battery module via packing, and the battery modules are stacked on the base plate by placing the battery modules on the base plate. Two battery stack assemblies are arranged side by side in the horizontal direction. Adjacent side plates are connected by a connecting metal fitting.

JP 2011-54353 A

  By the way, if vibration occurs in the secondary battery device, the battery module may move upward in the vertical direction. When the battery module moves upward in the vertical direction, an impact is applied to the battery module. For this reason, it is desired to regulate the upward movement of the battery module in the vertical direction.

  This invention is made | formed in view of the problem of such a prior art, The objective is to provide the battery pack which can control the movement to the vertical direction upper direction of a battery module.

A battery pack that solves the above problems includes a plurality of battery modules that are stacked in a vertical direction, a single plate-like member that is erected in the vertical direction and to which each of the plurality of battery modules is fixed via a bracket. A movement restricting member for restricting the battery module from moving upward in the vertical direction, and one end of the movement restricting member is joined to the battery module located at the uppermost position in the vertical direction among the plurality of battery modules. The other end positioned vertically below the one end is fixed to a member different from the plurality of battery modules, and the member different from the plurality of battery modules has a bottom portion, and the plurality of battery modules Is arranged on the bottom, and the other end of the movement restricting member is joined to the bottom .

  According to this, the movement restriction member restricts the upward movement of the battery module in the vertical direction. Since the movement restricting member is fixed to a member different from the battery module, even if a load is applied to the movement restricting member when the battery module attempts to move vertically upward, the movement restricting member The load is restricted from moving upward in the vertical direction. Therefore, the movement of the battery module upward in the vertical direction can be restricted.

Moreover, according to this, a battery module can be arrange | positioned in the bottom part of the member different from a battery module.

Moreover, according to this, the movement to the perpendicular direction of a movement control member is controlled because the other end of a movement control member is joined with a bottom part.
About the said battery pack, the said movement control member is joined only to the battery module located in the uppermost vertical direction among these battery modules, and is not joined to the battery module located in the lower vertical direction than it.
According to this, the process of fixing a movement control member to a battery module decreases, and the increase in the member (for example, volt | bolt) for fixing a movement control member to a battery module can be suppressed.
About the said battery pack, the said battery module has a square battery juxtaposed in the thickness direction, and the said one end of the said movement control member is in the battery module located in the uppermost vertical direction among these battery modules. It joins with the end surface of the parallel arrangement direction of the said square battery.

In the battery pack, the member different from the plurality of battery modules is preferably a counterweight mounted on an industrial vehicle.
According to this, the counterweight mounted on the industrial vehicle can also be used as a member for fixing the movement restricting member. For this reason, compared with the case where the member for fixing a movement control member as a separate body from a counterweight is provided, it can suppress that a number of parts increases.

  According to the present invention, it is possible to restrict the upward movement of the battery module in the vertical direction.

The schematic side view which shows the forklift of embodiment. The perspective view which shows the battery pack of embodiment. The perspective view which shows the battery module of embodiment. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. Sectional drawing which shows the battery pack of embodiment. The front view which shows the battery pack of embodiment.

  Hereinafter, an embodiment in which the battery pack is embodied as a battery pack mounted on a forklift will be described. In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” are “front”, “rear”, and “left” when the forklift driver is facing the front of the forklift. ”,“ Right ”,“ upper ”, and“ lower ”.

  As shown in FIG. 1, drive wheels 12 are provided at the front lower part of a vehicle body 11 of a forklift 10 as an industrial vehicle, and steering wheels 13 are provided at a rear lower part of the vehicle body 11. In addition, a cargo handling device is provided at the front portion of the vehicle body 11. The mast 14 constituting the cargo handling apparatus is erected on the front portion of the vehicle body 11, and the mast 14 is provided with a pair of left and right forks 16 via a lift bracket 15. The fork 16 is lifted and lowered together with the lift bracket 15 by driving a lift cylinder 17 connected to the mast 14. Further, the fork 16 is tilted together with the mast 14 by driving a tilt cylinder 18 connected to the mast 14. A load 19 is mounted on the fork 16. The vehicle body 11 is equipped with a traveling motor M1 as a drive source for the drive wheels 12 and a cargo handling motor M2 as a drive source for the fork 16.

  A cab 20 is provided in the center of the vehicle body 11. The cab 20 is provided with a driving seat 21 on which an operator (driver) can sit. A handle 22 is provided in front of the driving seat 21. A battery pack 30 is mounted below the cab 20. Hereinafter, the battery pack 30 will be described in detail.

  As shown in FIG. 2, the battery pack 30 is accommodated in the case 31. The case 31 includes a counterweight 32 for balancing with the load 19 mounted on the fork 16. The counterweight 32 is erected in the thickness direction of the weight portion 33 from the short-side end 33a of the weight portion 33 and the weight portion 33 and the other end in the longitudinal direction from the longitudinal direction one end 33c of the weight portion 33. The weight main body 34 has a rectangular plate shape extending over 33d. In other words, the weight portion 33 is erected from the proximal end of the weight body 34 in the thickness direction of the weight body 34. In the present embodiment, the weight body 34 is erected in the vertical direction. At the distal end of the weight body 34 (the end opposite to the base end of the weight body 34), a notch 35 is formed by cutting the weight body 34 in the thickness direction of the weight body 34.

  An inverted U-shaped frame 40 that is provided apart from the weight main body 34 is erected from the weight portion 33 at the other short end 33 b of the weight portion 33. The frame 40 includes a first column portion 41 and a second column portion 42 erected from two corners of the edge portion of the other end 33 b in the short direction on the upper surface of the weight portion 33, and the first column portion 41. And a base 43 that connects the upper end of the second column 42 (the end opposite to the end joined to the weight 33). That is, the case 31 has a front opening 30 a surrounded by the weight portion 33 and the frame 40 on the other end 33 b side of the weight portion 33. In the case 31, the front opening 30a is closed by a lid member 44 having a rectangular plate shape.

  The length in the standing direction of each column portion 41, 42 (the length in the longitudinal direction of each column portion 41, 42) is the same as the shortest length from the upper surface of the weight portion 33 to the distal end surface of the weight main body 34. A top plate 45 is supported on the upper surface of the frame 40 and the upper surface of the weight main body 34. The top plate 45 closes an opening (not shown) between the weight main body 34 and the frame 40. Further, the case 31 has a weight main body 34, a weight portion 33, a first pillar portion 41, and a one end side opening 30 b surrounded by a top plate 45 on the longitudinal end 33 c side of the weight portion 33. Further, the case 31 has an opening 30c on the other end side surrounded by the weight main body 34, the weight portion 33, the second column portion 42, and the top plate 45 on the other end 33d side of the weight portion 33 in the longitudinal direction. Have. The one end side opening 30 b is closed by the one end side lid member 46, and the other end side opening 30 c is closed by the other end side lid member 47. A case 31 is formed by the counterweight 32, the frame 40, the top plate 45, and the lid members 44, 46, and 47, respectively.

  A mounting plate 36 having a rectangular flat plate shape is fixed to the upper surface of the notch 35. On the mounting plate 36, a storage case 37 for storing control devices for controlling battery modules 51, 52, and 53, which will be described later, and a junction box 38 for storing relays, wirings, and the like are disposed.

  One surface in the thickness direction of the weight body 34 (the inner surface of the case 31) is an installation surface 34a on which the battery modules 51, 52, and 53 are installed. On the installation surface 34 a, a battery row in which the first battery module 51, the second battery module 52, and the third battery module 53 are arranged in the transverse direction of the weight body 34 is arranged in the longitudinal direction of the weight body 34. A set is provided. The first battery module 51 is provided at the lowest in the vertical direction, and is placed on the upper surface of the weight portion 33. The second battery module 52 is placed on the first battery module 51, and the third battery module 53 provided on the uppermost vertical direction is placed on the second battery module 52. Accordingly, the battery modules 51, 52, and 53 are stacked in the vertical direction. Therefore, in this embodiment, the weight part 33 becomes a bottom part.

  As shown in FIG. 3 and FIG. 4, each battery module 51, 52, 53 has a prismatic battery 55 held in a battery holder 54 arranged in parallel in the thickness direction of the prismatic battery 55. Between each square battery 55, a heat transfer plate 56 that conducts heat generated by the square battery 55 to the counterweight 32 is provided. In the battery modules 51, 52, and 53, end plates 57 are provided at both ends of the prismatic batteries 55 in the juxtaposed direction. A bracket 58 is fixed to the end plate 57, and the battery module 51, 52, 53 is fixed to the weight body 34 by fixing the bracket 58 to the weight body 34.

  The battery holder 54 is provided with a pair of support portions 54a provided to face each other. The support part 54a has a flat plate shape. A mounting plate 59 having a U-shaped cross section is supported between the pair of support portions 54a. On the mounting plate 59, a relay case 60 in which a relay is accommodated and an ECU case 61 in which the ECU is accommodated are placed.

  As shown in FIGS. 5 and 6, in each battery module 51, 52, 53, the end plate 57 is provided with a fixing member 70 as a movement restricting member. The fixing member 70 is formed by bending a rectangular plate member. The fixing member 70 has a rectangular plate-like extending portion 71. The extending portion 71 extends in the vertical direction, and the longitudinal direction of the extending portion 71 and the vertical direction are the same direction. The extending portion 71 extends along the arrangement direction of the battery modules 51, 52, 53. One end 71b (one end in the longitudinal direction) of the extending portion 71 (fixing member 70) is fixed to the end plate 57 of the third battery module 53 by a bolt B1. Note that one end 71 b of the extending portion 71 is one end of the fixing member 70.

  The fixing member 70 has a fastening portion 72 that is provided at the other end 71 a (the other end in the longitudinal direction) provided vertically below the one end 71 b of the extending portion 71 and extends in the thickness direction of the extending portion 71. doing. The fastening portion 72 is provided on the weight portion 33. The fastening portion 72, that is, the other end 71a of the extending portion 71 (fixing member 70) is fixed to the weight portion 33 which is a member different from the battery modules 51, 52, and 53 by the bolt B2. Thereby, the fastening portion 72 is in contact with the weight portion 33 and is joined to the weight portion 33. The other end 71 a of the extending portion 71, that is, the fastening portion 72 is the other end of the fixing member 70. Further, the “member different from the battery module” only needs to regulate the movement of the battery module by fixing the other end 71a of the extending portion 71 (fixing member 70). For example, the case 31, the counterweight 32, The vehicle body 11 of the forklift 10 may be used.

Next, the operation of the battery pack 30 will be described.
When the forklift 10 travels, the forklift 10 vibrates as it travels. Due to this vibration, the battery pack 30 also vibrates. When the battery pack 30 vibrates, the battery modules 51, 52, 53 try to move.

  The fixing member 70 is joined to the third battery module 53 whose one end 71b is disposed most vertically above, and the other end 71a located vertically below the one end 71b is a plurality of battery modules 51, 52, It is fixed to a weight part 33 which is a member different from 53. Accordingly, the upward movement of the third battery module 53 in the vertical direction is restricted. Further, since the battery modules 51, 52, 53 adjacent in the vertical direction are in contact with each other, the battery modules 51, 52 are pressed downward in the vertical direction by the third battery module 53. For this reason, even if the first battery module 51 and the second battery module 52 try to move upward in the vertical direction, the third battery module 53 restricts the upward movement in the vertical direction.

  Therefore, the fixing member 70 restricts the upward movement of each battery module 51, 52, 53 by restricting the upward movement of the third battery module 53 in the vertical direction.

Therefore, according to the above embodiment, the following effects can be obtained.
(1) The movement of the battery module 53 upward in the vertical direction is restricted by the fixing member 70. The fixing member 70 is joined to the third battery module 53 whose one end 71b is disposed most vertically above, and the other end 71a located vertically below the one end 71b is a plurality of battery modules 51, 52, It is fixed to a weight part 33 which is a member different from 53. Therefore, the upward movement of the third battery module 53 in the vertical direction can be restricted.

  (2) Since the counterweight 32 has the weight portion 33, the first battery module 51 can be placed on the weight portion 33, and the first battery module 51 is supported by the weight portion 33. Can do.

  (3) The first battery module 51 is placed on the weight portion 33, and the third battery module 53 is fixed to the fixing member 70. Further, the fixing member 70 is joined to the third battery module 53 having one end 71 b disposed at the uppermost position in the vertical direction, and the other end 71 a positioned vertically below the one end 71 b is fixed to the weight portion 33. ing. Further, the battery modules 51, 52, 53 are in contact with each other. For this reason, as the fixing member 70, a member that restricts only the movement of the third battery module 53 can be used to restrict the movement of each battery module 51, 52, 53 in the vertical direction.

  (4) The fixing member 70 regulates the movement of each battery module 51, 52, 53 by being fixed to the weight part 33 and the third battery module 53. For this reason, there is no need to fix the fixing member 70 to the first battery module 51 and the second battery module 52, and the number of steps for fixing the fixing member 70 to the battery module is reduced, and the fixing member 70 is attached to the battery module 51. , 52 can be prevented from increasing in number of members (for example, bolts).

  (5) For example, when the battery modules 51, 52, 53 arranged in the vertical direction are fixed by individual fixing members, the number of parts increases. By using the fixing member 70 that fixes only the third battery module 53 as in the present embodiment, an increase in the fixing member can be suppressed.

  (6) The counterweight 32 is used as a member for fixing the fixing member 70 (a member different from the battery module). The counter weight 32 mounted on the forklift 10 is also used as a member for fixing the fixing member 70, so that the parts can be compared with the case where the member for fixing the fixing member 70 is used separately from the counter weight 32. Points are reduced.

In addition, you may change embodiment as follows.
In the embodiment, the battery modules 51, 52, 53 may not be in direct contact with each other. For example, you may interpose a buffer material etc. between each battery module 51,52,53.

  In the embodiment, the battery modules 51, 52, 53 are directly placed on the weight part 33, but a support part for supporting the battery modules 51, 52, 53 is provided on the weight part 33. The battery modules 51, 52, 53 may be placed on the weight part 33 via the support part. That is, the battery modules 51, 52, and 53 are disposed on the weight portion 33 means that the battery modules 51, 52, and 53 can receive the load of the battery modules 51, 52, and 53. It shows that it is arranged.

  (Circle) in embodiment, each battery module 51,52,53 laminated | stacked and arrange | positioned may be arrange | positioned at intervals. In this case, the end plate 57 and the fixing member 70 of each battery module 51, 52, 53 are fixed by a bolt or the like.

In the embodiment, the fixing member 70 may be fixed to the battery holder 54.
In the embodiment, the shape of the fixing member 70 may be changed.
In the embodiment, the fixing member 70 may be fixed to the battery modules 51, 52, 53 and the weight part 33 with an adhesive or the like.

  In the embodiment, the fixing member 70 may be fixed to the weight main body 34 or the like as long as it has a contact portion that contacts the weight portion 33. For example, an extending portion that extends from the fastening portion 72 of the embodiment to the weight body 34 may be provided, and the extending portion may be fixed to the weight body 34.

  In the embodiment, the fixing member 70 may apply a load directed downward in the vertical direction to the third battery module 53 by pulling the third battery module 53 downward in the vertical direction. According to this, the load added to the 1st battery module 51 and the 2nd battery module 52 becomes large, and the movement to the vertical direction of the battery modules 51, 52, and 53 is controlled appropriately.

In the embodiment, the other end 71 a of the fixing member 70 may not be in contact with the weight portion 33.
In the embodiment, instead of the square battery 55, a cylindrical battery or a laminate battery may be used.

In the embodiment, the number of battery modules 51, 52, 53 arranged in a stack may be increased or decreased as long as it is two or more.
In the embodiment, the counterweight 32 may not have the weight part 33. That is, only the weight body 34 may be a counterweight. In this case, the other end 71a of the fixing member 70 is fixed to the weight main body 34, the vehicle body 11, or the like. That is, the battery pack 30 includes battery modules 51, 52, and 53, and any configuration can be used as long as the battery modules 51, 52, and 53 can be fixed to members different from the battery modules 51, 52, and 53 by the fixing member 70. It may be.

  In the embodiment, the other end 71 a of the fixing member 70 may not be in direct contact with the weight portion 33. For example, another member may be provided between the other end 71 a of the fixing member 70 and the weight portion 33, and the other end 71 a of the fixing member 70 may be in contact with the weight portion 33 via this other member.

In embodiment, the battery pack 30 is not restricted to the battery pack mounted in the forklift 10 (industrial vehicle), You may be actualized in the other battery pack.
In the embodiment, a counterweight mounted on a power shovel (industrial vehicle) may be used as the counterweight.

  DESCRIPTION OF SYMBOLS 30 ... Battery pack, 32 ... Counterweight, 33 ... Weight part, 34 ... Weight main body, 51, 52, 53 ... Battery module, 70 ... Fixing member, 71 ... Extension part, 71a ... Other end, 71b ... One end, 72 ... fastening part.

Claims (4)

A plurality of battery modules stacked in a vertical direction;
One plate-like member that is erected in the vertical direction and to which each of the plurality of battery modules is fixed via a bracket;
A movement restricting member for restricting the upward movement of the battery module in the vertical direction,
One end of the movement restricting member is joined to a battery module positioned most vertically above the plurality of battery modules, and the other end positioned vertically below the one end is different from the plurality of battery modules. Fixed to the member ,
The member different from the plurality of battery modules has a bottom,
The plurality of battery modules are disposed on the bottom,
The battery pack , wherein the other end of the movement restricting member is joined to the bottom . The movement restricting member, the a plurality of joining only the battery module located at the most vertically above one of the battery modules, battery of claim 1, it than not bonded to the battery module located vertically below pack. The battery module is composed of prismatic batteries arranged in parallel in the thickness direction,
The said one end of the said movement control member is joined to the end surface of the parallel arrangement direction of the said square battery in the battery module located in the uppermost vertical direction among these battery modules. Battery pack. The battery pack according to any one of claims 1 to 3 , wherein the member different from the plurality of battery modules is a counterweight mounted on an industrial vehicle.