JP2016192335A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack that has rigidity against a load such as vibration and impact and is inexpensive.SOLUTION: A battery pack 100 comprises: an intermediate support member 50 interposed between first and second battery modules 30; first and second front/rear brackets 120, 130, 220, 230 individually arranged in a direction of aligned secondary battery cells of the first and second battery modules 30. The intermediate support member 50 includes: a first support plate 510 including a drawn part 511; and a second support plate 520 connected to the first support plate 510. The first front bracket 130, the second front bracket 230, and the intermediate support member 50 are connected; the first rear bracket 120, the second rear bracket 220, and the intermediate support member 50 are connected.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery pack in which a plurality of battery modules having a plurality of secondary battery cells are connected.

There is a battery pack in which a plurality of battery modules mounted as a power source are connected to an electric vehicle such as an electric vehicle or a hybrid vehicle.
Since the battery pack includes a plurality of battery modules having a plurality of secondary battery cells, the battery pack is heavy and easily receives an impact or vibration during vehicle travel. For this reason, the battery pack needs to have a highly rigid structure that can withstand impact and vibration.

A battery pack having the following structure is known.
The battery modules stacked in the upper and lower stages are connected by brackets. The bracket is fastened to a center plate sandwiched between the upper case and the lower case. The upper and lower stacked battery modules are housed in a case together with a center plate. Each battery module is accommodated in a state of being separated from the peripheral side surface, top surface, and bottom surface of the case. (For example, refer to Patent Document 1).

JP 2013-129391 A

  In the structure of Patent Document 1, since the battery module is accommodated in a state of being separated from the peripheral side surface of the case, a large load such as vibration or impact is applied to the center plate. For this reason, it is necessary to form the center plate with a highly rigid and expensive member, resulting in high cost.

  The battery pack of the present invention includes first and second battery modules in which a plurality of secondary battery cells are housed, a first support member that supports the first battery module, a first battery module, and a second battery module. A second support member interposed between the first and second battery modules, and first and second front portions respectively disposed on the front end side in the arrangement direction of the secondary battery cells in the first and second battery modules. A bracket, and first and second rear brackets arranged on the rear end side in the arrangement direction of the secondary battery cells in the first and second battery modules, respectively, and the second support member includes a drawing portion And a second support plate joined to the first support plate by welding, and the first front bracket, the second front bracket, and the second support member are Connected and the first rear bracket and the second rear bracket Tsu bets and the second support member is connected.

  According to the present invention, it is possible to obtain an inexpensive battery pack having high rigidity against loads such as vibration and impact.

1 is an external perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a perspective view of a battery module at the lower stage of the battery pack illustrated in FIG. 1. FIG. 3 is a perspective view of the base plate illustrated in FIG. 2. FIG. 3 is an external perspective view of a state where an intermediate support member is assembled to the battery module illustrated in FIG. 2. FIG. 2 is a perspective view of the upper battery module illustrated in FIG. 1. FIG. 6 is a perspective view of the intermediate support member illustrated in FIG. 5. The perspective view which shows the state with which the battery module of the upper-lower stage was connected. The perspective view which shows the holding structure of a harness. The perspective view of the state which attached the upper support member to the battery module of the upper stage. FIG. 10 is a perspective view of the upper support member illustrated in FIG. 9. The external appearance perspective view of the state which was illustrated in FIG. 1 and the exterior panel was attached to the battery pack.

Embodiment 1
Hereinafter, a battery pack according to an embodiment of the present invention will be described in detail with reference to the drawings.
The battery pack 100 is mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle as a power source for an electric motor, lighting, a control device, or the like. FIG. 1 is an external perspective view of a battery pack according to an embodiment of the present invention.
The battery pack 100 includes a lower battery module 10A, an upper battery module 10B stacked on the battery module 10A, and a DC-DC converter 41 and a control unit 42 stacked side by side on the battery module 10B. ing.
Battery module 10A and battery module 10B are connected, and DC-DC converter 41 and control unit 42 are both connected to battery module 10B.

FIG. 2 is a perspective view of the lower battery module 10A of the battery pack 100 shown in FIG.
The lower battery module 10A includes a base plate 110 serving as a first support member, a battery module 30 having a plurality of secondary battery cells, a front bracket 130 disposed on the front end side of the battery module 30, and a battery module. 30 and a rear bracket 120 disposed on the rear end side.
The front-rear direction, the left-right direction, and the up-down direction are as illustrated.

FIG. 3 is a perspective view of the base plate 110 shown in FIG. The base plate 110 is formed by pressing a metal member such as iron. A rectangular recess 111 formed by drawing is formed in the central portion of the base plate 110. Two bracket fixing shafts 112 are provided at the front end portion and the rear end portion of the base plate 110, respectively. The bracket fixing shaft 112 is a fastening member such as a bolt, and a screw is formed on the outer periphery.
In addition, two battery module fixing shafts 113 are provided on the front end side and the rear end side between the bracket fixing shaft 112 on the front end side and the rear end side of the base plate 110 and the recess 111, respectively. The battery module fixed shaft 113 is a fastening member such as a bolt longer than the bracket fixed shaft 112, and has a screw formed on the outer periphery.

  FIG. 4 is an external perspective view of the battery module illustrated in FIG. 2 with an intermediate support member assembled thereto. The battery module 30 is configured by housing a plurality of secondary battery cells (not shown) in a module case 310. The secondary battery cells are, for example, cylindrical lithium ion batteries, and are arranged substantially linearly from the front to the rear of the module case 310. The secondary battery cell has, for example, an output terminal having a battery can bottom side as a negative electrode terminal and a battery lid side as a positive electrode terminal, the axial direction is parallel to the left-right direction, and the negative electrode terminal and the positive electrode terminal are They are arranged alternately in opposite directions. Adjacent secondary battery cells are connected by a bus bar (not shown), and the whole is electrically connected in series.

  A refrigerant discharge port (not shown) is provided on the front end surface of the module case 310. In addition, an inlet 321 through which the refrigerant flows is provided on the rear end surface of the module case 310. Inside the module case 310, a battery housing part that houses secondary battery cells (not shown) and a cooling passage through which a coolant that cools the secondary battery cells housed in the battery housing part flows are formed.

The module case 310 includes an upper holding member 301, an intermediate holding member 302, and a lower holding member 303. Each holding member 301 to 303 and the side plate 304 are formed of an insulating resin such as polybutylene terephthalate.
Boss portions 301a, 302a, and 303a having through holes 311 penetrating in the vertical direction are formed at the front end portion and the rear end portion of each of the upper holding member 301, the intermediate holding member 302, and the lower holding member 303. The boss portions 301a to 303a are respectively provided at two positions on the left and right end portions of the front end portion and the rear end portion of the holding members 301 to 303, respectively.
The upper holding member 301, the intermediate holding member 302, and the lower holding member 303 are laminated in three layers so that the through holes 311 are coaxial.

Each of the upper holding member 301 and the intermediate holding member 302 is formed with a plurality of half-divided cylindrical grooves parallel to the left-right direction on the side facing the mating member (not shown). The cylindrical secondary battery cell is accommodated in a cylindrical groove formed by a groove between the upper holding member 301 and the intermediate holding member 302. Each of the lower holding member 303 and the intermediate holding member 302 is formed with a plurality of half-divided cylindrical grooves parallel to the left and right direction (not shown) on the side facing the counterpart member. The secondary battery cell is housed in a cylindrical groove formed by a groove between the lower holding member 303 and the intermediate holding member 302. That is, in the module case 310, cylindrical secondary battery cells are stacked in two upper and lower stages, and are arranged in the front-rear direction with the axis parallel to the left-right direction.
The pair of side plates 304 respectively cover the bottom surface of the battery can and the battery lid of the cylindrical secondary battery cell together with the bus bar. The holding members 301 to 303 and the pair of side plates 304 are fixed so as to be connected to each other by a fastening member (not shown).

  The battery module 30 has a total of four battery module fixing shafts 113 (see FIG. 3) provided in the front and rear end portions of the base plate 110 in the through holes 311 provided in the boss portions 301a, 302a, and 303a. It is inserted and placed on the base plate 110. In this state, the battery module 30 is fixed to the base plate 110 by a nut 152 (see FIG. 2) fastened to the upper end portion of each battery module fixing shaft 113 protruding from the through hole 311.

The front bracket 130 and the rear bracket 120 have substantially the same structure. Hereinafter, the rear bracket 120 will be described as a representative of both the brackets 120 and 130.
The rear bracket 120 is made of metal, for example. The rear bracket 120 is formed by drawing, for example, and has a bottom portion 120a and a frame portion 121. An opening 120b that exposes the refrigerant inlet 321 of the battery module 30 is formed in the bottom 120a substantially at the center. The frame portion 121 includes a lower portion 121a, a pair of stepped side portions 121b, and a stepped upper portion 121c having a rectangular protrusion at the center.
The lower part 121a, the side part 121b, and the upper part 121c are integrally formed in an annular shape on the peripheral side part of the bottom part 120a. For this reason, the rear bracket 120 has high rigidity in any of the vertical and horizontal directions and the front and rear directions. Although not shown, the refrigerant outlet of the battery module 30 is exposed from the bottom of the annular front bracket 130.

  Four bracket fixing shafts 122 are provided on the upper part 121 c of the frame part 121 of the rear bracket 120. The bracket fixing shaft 122 is a fastening member such as a bolt, and a screw is formed on the outer periphery.

A nut 151 is welded to the inner surface side of each of the pair of side portions 121b of the frame portion 121 of the rear bracket 120. As will be described later, a fastening member for fixing the exterior panel is screwed onto the nut 151.
The bracket fixing shaft 112 of the base plate 110 is inserted into the lower portion 121 a of the frame portion 121 of the rear bracket 120 and placed on the base plate 110. In this state, the rear bracket 120 is fixed to the base plate 110 by the nut 153 fastened to the upper end portion of the bracket fixing shaft 112 protruding from the lower portion 121a of the frame portion 121 of the rear bracket 120.
The front bracket 130 has the same structure as the rear bracket 120. The front bracket 130 is fixed to the base plate 110 by inserting the bracket fixing shaft 112 of the base plate 110 through the frame portion and fastening a nut to the upper end portion of the bracket fixing shaft 112.
The intermediate support member 50 is fixed on the lower battery module 10A.

  6 is a perspective view of the intermediate support member 50 shown in FIG. 5, and FIG. 7 is a perspective view showing a state where the upper and lower battery modules 10A and 10B are connected. As illustrated in FIG. 7, the upper battery module 10B includes an intermediate support member 50, a rear bracket 220 disposed on the rear end side of the battery module 10B, and a front portion disposed on the front end side of the battery module 10B. And a bracket 230.

  As shown in FIG. 6, the intermediate support member 50 includes an upper support plate 510 and a lower support plate 520. The upper support plate 510 and the lower support plate 520 are formed by pressing a metal member such as iron.

The upper support plate 510 is formed with a plurality of drawn portions 511 along the front-rear direction. A drawn portion 512 is formed at the front end portion and the rear end portion of the upper support plate 510. The drawn portions 511 and 512 have a substantially rectangular shape and are formed to protrude upward. The drawing unit 512 is provided with two battery module fixed shafts 513. The two battery module fixed shafts 513 are disposed on the left side and the right side of each drawing unit 512. Each battery module fixing shaft 513 is a fastening member such as a bolt, and a screw is formed on the outer periphery.
Two through holes 518 are provided at the rear end portion of the upper support plate 510, and two through holes 519 are provided at the front end portion. The through holes 518 and 519 are provided at positions corresponding to the two bracket fixing shafts 122 on the center side of the front and rear brackets 120 and 130 shown in FIG.

  On both the left and right sides of the upper support plate 510, harness attachment portions 516 formed by bending in an L shape are provided. A plurality of harness attachment portions 516 are formed along the front-rear direction. A substantially rectangular through hole 517 is provided at the base of each harness mounting portion 516.

  FIG. 8 is a perspective view showing a holding structure of the harness 532. The harness 532 is disposed extending in the front-rear direction. The binder 533 is inserted through a through hole 517 provided in the harness attachment portion 516, wound around the outer periphery of the harness 532, and pressed against the inside of the harness attachment portion 516 bent in an L shape. In this state, the front end portion of the binder 533 is bound to the rear end portion, that is, captured. Thereby, the harness 532 is fixed to the harness attachment portion 516. The harness 532 is fixed in this manner at each harness attachment portion 516.

As shown in FIG. 6, the lower support plate 520 has substantially the same shape as the upper support plate 510 in plan view. A fixing portion 521 that is bent downward is formed at each corner portion on the rear end side of the lower support plate 520. The fixing portion 521 has a substantially flat bottom surface portion, and a through hole 522 is formed in the bottom surface portion. The through holes 522 are provided at positions corresponding to the bracket fixing shafts 122 (see FIG. 5) on both side portions in the left-right direction of the rear bracket 120. Further, two through holes 528 are provided on the rear end side of the lower support plate 520, and two through holes 529 are provided on the front end. The through holes 528 and 529 are provided at positions corresponding to the two bracket fixing shafts 122 on the center side of the front and rear brackets 120 and 130, respectively.
That is, the through hole 528 and the upper support plate 510 through hole 518 of the lower support plate 520 are provided coaxially, and the through hole 529 of the lower support plate 520 and the upper support plate 510 through hole 519 are provided coaxially. Yes.

  On both side ends of the lower support plate 520 in the left-right direction, exterior cover mounting portions 523 formed by bending in an L shape are formed. A plurality of exterior cover attachment portions 523 are arranged along the front-rear direction. A nut 524 is joined to the inner surface of each exterior cover mounting portion 523 by welding. The outer cover attaching portion 523 at the right end is bent downward.

  The intermediate support member 50 is formed by stacking the upper support plate 510 above the lower support plate 520 and joining the upper support plate 510 and the lower support plate 520 by spot welding or the like. As shown in FIG. 6, the joint portion 531 is provided at a number of flat portions where the drawn portions 511 and 512 of the upper support plate 510 are not formed.

  As described above, the upper support plate 510 of the intermediate support member 50 is provided with a plurality of drawn portions 511 and 512 along the longitudinal direction, which is the longitudinal direction. The intermediate support member 50 is configured by stacking an upper support plate 510 and a lower support plate 520. Further, the upper support plate 510 and the lower support plate 520 are joined by a large number of joining portions 531. For this reason, the intermediate support member 50 has high rigidity against loads such as vibration and impact.

  The through holes 522 of the intermediate support member 50 are inserted through the two bracket fixing shafts 122 on both ends of the rear bracket 120. Further, the through holes 528 and 518 of the intermediate support member 50 are inserted through the two bracket fixing shafts 122 on the center side of the rear bracket 120, and the through holes 529 and 519 of the intermediate support member 50 are the two of the front bracket 130. It is inserted through a bracket fixing shaft (not shown). Accordingly, the intermediate support member 50 is disposed on the lower battery module 10 </ b> A in a state where the bottom portion of the fixing portion 521 is placed on the upper portion 121 c of the lower-side rear bracket 120. In this state, the upper end portion of the bracket fixing shaft 122 protrudes from the lower support plate 520. As shown in FIG. 7, the intermediate support member 50 is fixed to the lower rear bracket 120 by fastening a nut 261 to the upper end portion of the bracket fixing shaft 122 protruding from the lower support plate 520. Although not shown, the same applies to the front end side, and the intermediate support member 50 is placed on the lower front bracket 130 while being inserted through the bracket fixing shaft 122. Thus, the intermediate support member 50 is coupled to the lower battery module 10A.

  Through holes provided in the boss portions 301a, 302a, and 303a of the battery module 10B in each of the four battery module fixed shafts 513 provided at the front and rear ends of the intermediate support member 50 stacked on the lower battery module 10A. 311 is inserted. Thereby, the battery module 10 </ b> B is placed on the intermediate support member 50. The battery module 10B is the same as the lower battery module 10A. The battery module 10B is fixed to the base plate 110 by a nut 263 fastened to the upper end portion of each battery module fixing shaft 513 protruding from the battery module 10B.

  As shown in FIG. 7, the rear bracket 220 provided in the upper battery module 10B has the same structure as the rear bracket 120 provided in the lower battery module 10A. That is, the rear bracket 220 is formed by, for example, metal drawing, and has a bottom portion 220a and a frame portion 221. In the bottom 220a, an opening 220b that exposes the refrigerant inlet 321 of the battery module 30 is formed substantially at the center. The frame portion 221 includes a lower portion 221a, a pair of stepped side portions 221b, and an upper portion 221c having a shape protruding in a rectangular shape at a central portion. The lower part 221a, the side part 221b, and the upper part 221c are integrally formed in an annular shape on the peripheral side part of the inner bottom part 220a. For this reason, the rear bracket 120 has high rigidity in any of the vertical and horizontal directions and the front and rear directions. Although not shown, from the bottom of the annular front bracket 230, the refrigerant discharge port of the battery module 10B is exposed.

  Four bracket fixing shafts 222 are provided on the upper part 221 c of the frame part 221 of the rear bracket 220. The bracket fixing shaft 222 is a fastening member such as a bolt, and a screw is formed on the outer periphery. However, the central part of the upper part 221c of the frame part 221 of the rear bracket 220 is recessed downward. The front bracket 230 has the same structure as the rear bracket 220.

  The lower part 221a of the frame part 221 of the rear bracket 220 is inserted through the two bracket fixing shafts 122 on the center side of the lower part rear bracket 120. Since the intermediate support member 50 is mounted on the lower side rear bracket 120, the upper side rear bracket 220, the intermediate support member 50, and the lower side rear bracket 120 connect the intermediate support member 50. It will be in the state where three layers were laminated. In this state, the nut 152 is fastened to the upper end portion of the bracket fixing shaft 122 of the rear bracket 120 protruding from the through holes 528 and 518 of the intermediate support member 50. Thereby, the rear bracket 120 and the front bracket 130 are connected via the intermediate support member 50.

  Although not shown, the same applies to the front side, and the upper side front bracket 230 and the lower side front bracket 130 are fastened in a state where three layers are stacked with the intermediate support member 50 interposed therebetween. It is fastened and connected by a member. In this way, the upper battery module 10B is stacked on the lower battery module 10A.

  FIG. 9 is a perspective view of a state in which the upper support member 60 is attached to the upper battery module 10B, and FIG. 10 is a perspective view of the upper support member 60 illustrated in FIG. An upper support member 60 is fixed on the battery module 10B. As shown in FIG. 9, the upper support member 60 includes an upper layer support plate 610 and a lower layer support plate 620. Upper layer support plate 610 and lower layer support plate 620 are formed by pressing a metal member such as iron.

A plurality of upper mounting shafts 612 arranged along the front-rear direction are provided on both side portions of the upper layer support plate 610, respectively. The upper mounting shaft 612 is a fastening member such as a bolt, and a screw is formed on the outer periphery. The upper support plate 610 has a rectangular opening 610a that is long in the longitudinal direction. The lower layer support plate 620 is formed with a plurality of drawn portions 621 provided substantially in the center along the front-rear direction. The drawing portion 611 of the lower layer support plate 620 is fitted in the opening 610 a of the upper layer support plate 610.
At the front end portion of the upper layer support plate 610, four through holes 613 through which the four bracket fixing shafts 222 provided in the rear bracket 220 of the battery module 10B are inserted are provided. In addition, a through hole 614 into which three bracket fixing shafts 232 provided in the front bracket 230 of the battery module 10B are inserted is provided at the front end portion of the upper layer support plate 610.

  On the left and right ends of the upper layer support plate 610, exterior cover mounting portions 615 formed by bending in an L shape are formed. A plurality of exterior cover attachment portions 615 are arranged along the front-rear direction. A nut 616 is joined to the inner surface of each exterior cover mounting portion 615 by welding. Note that the outer cover attaching portion 615 on the right end is bent downward and is not shown in FIG.

  The lower layer support plate 620 has substantially the same shape as the upper layer support plate 610 in plan view. Through holes 623 and 624 through which bracket fixing shafts 222 and 232 provided in the front bracket 220 of the battery module 10B are inserted are provided at the front and rear ends of the lower layer support plate 620, respectively. That is, the through holes 623 and 624 of the lower layer support plate 620 and the through holes 613 and 614 of the upper layer support plate 610 are formed coaxially with the bracket fixing shafts 222 and 232 of the front and rear brackets 220 and 230, respectively.

  In addition, a plurality of harness mounting portions 626 arranged along the front-rear direction are provided at both side ends of the lower layer support plate 620 in the left-right direction. As shown in FIG. 8, the harness attachment portion 626 is for holding the harness 532, similarly to the harness attachment portion 516 provided on the upper support plate 510 of the intermediate support member 50. Omitted.

  The upper support member 60 is formed by laminating an upper support plate 610 above the lower support plate 620 and joining the upper support plate 610 and the lower support plate 620 by spot welding or the like. Although not shown in the drawing, the drawing portion 611 of the upper support plate 610 is formed at the joining portion similarly to the joining of the upper support plate 510 and the lower support plate 520 when the intermediate support member 50 shown in FIG. 6 is formed. It is not provided in many places on the flat part.

  As described above, the lower layer support plate 620 constituting the upper support member 60 is provided with a plurality of drawn portions 611 along the longitudinal direction which is the longitudinal direction. The upper support member 60 is configured by laminating an upper layer support plate 610 and a lower layer support plate 620. Further, the upper layer support plate 610 and the lower layer support plate 620 are joined at a number of joints. For this reason, the upper support member 60 has high rigidity against loads such as vibration and impact.

  The upper support member 60 is formed by inserting through holes 613, 623 and 614, 624 provided on the front and rear end sides into bracket fixing shafts 222, 232 provided on the front and rear brackets 220, 230 on the upper side. The upper and lower front and rear brackets 220 and 230 are mounted. In this state, the upper end portions of the bracket fixing shafts 222 and 232 protrude from the upper support member 60. A nut 265 is fastened to the upper part of the bracket fixing shafts 222 and 232 protruding from the upper support member 60 to fix the upper support member 60 to the front and rear brackets 220 and 230. This state is shown in FIG.

  A DC-DC converter 41 and a control unit 42 are fixed on the upper support member 60. As shown in FIG. 1, the DC-DC converter 41 and the control unit 42 are each fixed to the upper support member 60 by nuts fastened to the upper mounting shaft 612 provided on the upper support member 60.

FIG. 11 is an external perspective view of the battery pack 100 with an exterior panel attached as shown in FIG. The battery pack 100 includes a base plate 110 disposed on the bottom side, a pair of side panels 701 disposed on the left and right sides, a rear panel 702 disposed on the rear surface side, an upper panel 703 disposed on the upper surface side, and a non-panel. Covered by the rear panel shown.
Side panel 701 inserts fastening member 712 such as a bolt from an attachment hole provided in recess 711 of side panel 701, and nut 524 joined to exterior cover attachment portion 523 of intermediate support member 50 and the exterior of upper support member 60. The battery pack 100 can be attached by fastening to the nut 616 joined to the cover attaching portion 615.

  The rear panel 702 can be attached to the battery pack 100 by fastening a fastening member 713 such as a bolt to a nut 151 joined to the rear brackets 120 and 220 from an attachment hole provided in the rear panel 702. Therefore, when assembling the side panel 701 and the rear panel 702, it is possible to save the trouble of arranging the nuts inside the side panel 701 or the rear panel 702, and to improve the efficiency of the assembling work.

According to one embodiment of the battery pack of the present invention, the following effects are obtained.
(1) Since the following structure is adopted, it is possible to increase the rigidity with respect to a load such as vibration and impact.
1a. The intermediate support member 50 has the following structure.
(I) The upper support plate 510 and the lower support plate 520 are stacked.
(Ii) The upper support plate 510 and the lower support plate 520 are joined by a large number of joining portions 531.
(Iii) The upper support plate 510 is provided with a plurality of drawn portions 511 and 512.
1b. The upper support member 60 has the following structure.
(I) The upper support plate 610 and the lower support plate 620 are stacked.
(Ii) The upper layer support plate 610 and the lower layer support plate 620 are joined at a large number of joints.
(Iii) A plurality of drawn portions 621 are provided on the lower layer support plate 620.

(2) The harness mounting portion 516 is integrally formed on the upper support plate 510 of the intermediate support member 50. For this reason, the number of parts can be reduced, and the cost can be reduced. The same applies to the upper support member 60, and the harness mounting portion 626 is provided on the lower support plate 620, so that the number of parts can be reduced and the cost can be reduced.

(3) The exterior cover attaching portion 523 is integrally formed on the lower support plate 520 of the intermediate support member 50, and the nut 524 for attaching the exterior side panel 701 is joined to the exterior cover attaching portion 523 by welding. In addition, an exterior cover attaching portion 615 is integrally formed on the upper support plate 610 of the upper support member 60, and a nut 616 for attaching the exterior side panel 701 is joined to the exterior cover attaching portion 615 by welding. For this reason, attachment of the side panel 701 can be performed efficiently.

(4) In the intermediate support member 50, the harness attachment portion 516 is provided on the upper support plate 510, and the exterior cover attachment portion 523 is provided on the lower support plate 520. That is, the load transmitted via the harness 532 and the load transmitted via the side panel 701 are received by different members. For this reason, each support plate 510,520 can be made into a member with a small plate | board thickness, and cost reduction can be aimed at. The same applies to the upper support member 60. The harness mounting portion 626 is provided on the lower layer support plate 620, the exterior cover mounting portion 615 is provided on the upper layer support plate 610, and the load transmitted via the harness 532 and the side panel 701 are used. The load is transmitted by a different member. For this reason, each support plate 610 and 620 can be made into a member with a small plate | board thickness, and cost reduction can be aimed at.

(5) Each of the front and rear brackets 120, 130, 220, and 230 has a structure in which an annular frame portion is formed on the bottom portion and the peripheral side portion of the bottom portion. For this reason, the rigidity with respect to a load is large with respect to vibration, impact, etc. from each direction.

(6) Nuts 151 to which fastening members 712 and 713 for attaching the side panel 701 and the rear panel 702 are screwed are joined to the front and rear brackets 120, 130, 220, and 230 by welding or the like. For this reason, the efficiency of the assembly | attachment operation | work of the side surface panel 701 and the rear surface panel 702 can be achieved.

  In the above-described embodiment, the battery module 10A and the battery module 10B are configured such that the intermediate support member 50 is interposed between the lower side front / rear brackets 120, 130 and the upper side front / rear brackets 220, 230. The fixing portion 521 of the lower support plate 520 is illustrated as a structure that is coupled to the lower bracket 120 on the lower stage side. However, the connection between the battery module 10A and the battery module 10B is fastened without the intermediate support member 50 between the lower front and rear brackets 120 and 130 and the upper front and rear brackets 220 and 230. It is good also as a structure to do. That is, the lower-stage rear bracket 120 and the upper-stage rear bracket 220 may be directly connected, and the lower-stage front bracket 130 and the upper-stage front bracket 230 may be directly connected. Even in this case, since the fixing portion 521 of the lower support plate 520 is fastened to the lower bracket 120 by the fastening member, the intermediate support member 50 is coupled to the battery module 10A.

  Alternatively, the battery module 10A and the battery module 10B may be fastened via the intermediate support member 50 between the lower front / rear brackets 120 and 130 and the upper front / rear brackets 220 and 230. . That is, the intermediate support member 50 may have a structure in which the fixing portion 521 for connecting to the lower rear bracket 120 is not formed.

  The front and rear brackets 120, 130, 220, and 230 are illustrated as a structure having a bottom portion and a frame portion formed in an annular shape on the peripheral side portion of the bottom portion. However, the frame portions of the front and rear brackets 120, 130, 220, and 230 do not necessarily have an annular shape, and may be members having a notch portion on the lower side. For example, the end portions on both sides of the notch are fastened to the intermediate support member 50, or the intermediate support member 50 is interposed between the lower front / rear brackets 120, 130 and the upper front / rear brackets 220, 230. Or can be laminated in three layers.

  In the above embodiment, the battery pack 100 is illustrated as a structure in which the battery module 10A and the battery module 10B are stacked in two stages. However, the intermediate support members 50 and the battery modules 10 may be alternately stacked to form the battery pack 100 including the battery modules 10 having three or more stages.

  In the said embodiment, it illustrated as a cylindrical lithium ion secondary battery cell being accommodated in battery module 10A, 10B. However, the battery modules 10A and 10B may be cylindrical secondary battery cells other than lithium ion secondary battery cells, such as nickel metal hydride battery cells. Moreover, battery module 10A, 10B is good also as what has not a cylindrical secondary battery but a square secondary battery cell.

  The battery pack 100 described above is used in a power supply device for a vehicle such as another electric vehicle, for example, a railway vehicle such as a hybrid train, a shared vehicle such as a bus, a cargo vehicle such as a truck, and an industrial vehicle such as a battery-type forklift truck. You can also.

  The battery pack 100 can also be applied to a power storage device that constitutes a power supply device other than an electric vehicle, such as an uninterruptible power supply device used in a computer system or a server system, or a power supply device used in a private power generation facility.

  In addition, the battery pack of the present invention can be variously modified and configured within the scope of the invention. In short, the battery pack is interposed between the first battery module and the second battery module. Intermediate support members, and first and second front / rear brackets respectively disposed at front and rear portions in the arrangement direction of the secondary battery cells in the first and second battery modules, And a first support plate having a drawn portion and a second support plate joined to the first support plate, wherein the first front bracket, the second front bracket and the intermediate support member are What is necessary is just to be connected and the first rear bracket, the second rear bracket, and the intermediate support member be connected.

10A, 10B Battery module 100 Battery pack 110 Base plate 111 Recess 112, 222, 232 Bracket fixing shaft 113 Battery module fixing shaft 120, 220 Rear bracket 120a, 220a Bottom portion 121, 221 Frame portion 130, 230 Front bracket 151, 152, 153 Nut 30 Battery module 301 Upper holding member 301a to 303a Boss portion 302 Intermediate holding member 303 Lower holding member 304 Side plate 310 Module case 311 Through hole 41 DC-DC converter 42 Control unit 50 Intermediate support member 510 Upper support plate 511, 512 Aperture Processing portion 513 Battery module fixed shaft 516 Harness mounting portion 520 Lower support plate 521 Fixed portion 523 Exterior cover mounting portion 524 Nut 531 Joint portion 532 Harne 60 upper support member 610 the upper support plate 611 drawn portion 612 upper mounting shaft 615 outer cover mounting part 620 lower support plate 626 harness attachment portion 701 side panel 702 Rear panel 703 top panel

Claims (9)

A first and second battery module in which a plurality of secondary battery cells are housed;
A first support member for supporting the first battery module;
A second support member interposed between the first battery module and the second battery module;
First and second front brackets respectively disposed on the front end side in the arrangement direction of the secondary battery cells in the first and second battery modules;
First and second rear brackets arranged on the rear end side in the arrangement direction of the secondary battery cells in the first and second battery modules,
The second support member includes a first support plate having a drawing portion,
A second support plate joined to the first support plate by welding,
The first front bracket, the second front bracket and the second support member are coupled; and
A battery pack in which the first rear bracket, the second rear bracket, and the second support member are coupled. The battery pack according to claim 1,
The second support member has a front end extending to the front side in the arrangement direction of the secondary battery cells and a rear end extending to the rear side in the arrangement direction of the secondary battery cells. The first front bracket, the front end portion of the second support member, and the second front bracket are stacked and connected, and the first rear bracket and the rear of the second support member are connected. An end portion and the second rear bracket are stacked and connected to each other. The battery pack according to claim 1,
The second battery module has a module case that houses a plurality of the secondary battery cells,
The module case has a plurality of boss portions each formed with a through hole, and the second support member is provided with a shaft that is inserted into the through hole of each of the boss portions. The battery module is a battery pack that is held by a fastening member fastened to the shaft inserted through the through hole. The battery pack according to claim 1,
The battery pack in which the 2nd supporting member is formed with the some harness attachment part provided along the sequence direction of the said secondary battery cell. The battery pack according to claim 1,
The battery pack in which the said 2nd support member is formed with the some exterior cover attaching part provided along the sequence direction of the said secondary battery cell. The battery pack according to claim 5,
A battery pack in which a nut joined by welding is provided on the exterior cover mounting portion. The battery pack according to claim 1,
A plurality of the drawn portions of the first support plate are provided along the arrangement direction of the secondary battery cells,
The battery pack in which the first support plate and the second support plate are joined at a position corresponding to a separation portion of the drawing portion in the first support plate. The battery pack according to claim 1,
The first and second front brackets and the first and second rear brackets each have a bottom portion and a frame portion formed on a peripheral side portion of the bottom portion. The battery pack according to claim 3,
The module case has a cooling passage through which a cooling medium for cooling the secondary battery cells flows, and an inlet connected to the cooling passage is formed at a front portion in the arrangement direction of the secondary battery cells. A discharge port connected to the cooling passage is formed at the rear of the arrangement direction of the secondary battery cells,
The first and second front brackets have openings that expose the inflow ports of the module case,
The battery pack which has an opening which exposes the discharge port of the module case in the first and second rear brackets.

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