Battery pack

Abstract

To provide a battery pack capable of effectively using a space of a battery pack inner part and a battery pack circumference while protecting a connector part.SOLUTION: A battery pack 20 comprises a lower case 40 that covers a lower part of a plurality of battery modules 21, and has an upper part opened. At least one of a front wall part 42 and a rear wall part 43 of the lower case 40, includes: a step part 431 that is extended in a front / back direction viewed from a vertical direction; a convex wall part 432 that is bent from one end part of the step part 431 and is extended to one side in a right / left direction; and a concave wall part 433 that is bent from the other end part of the step part 431 and is extended to the other side of the right / left direction. Viewed from the vertical direction, at least one part of at least one battery module 21 is arranged to a space surrounded by the convex wall part 432, the step part 431, a left wall part 44 and a right wall part 45 of the lower case 40. A connector part 82 is provided to the concave wall part 433.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a battery pack mounted on a vehicle or the like.

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development on secondary batteries that contribute to energy efficiency have been carried out. In particular, in vehicles, due to the increasing awareness of global environmental protection in recent years, the electrification of drive sources, such as hybrid vehicles and electric vehicles, has been rapidly progressing. In secondary batteries mounted on electric vehicles such as hybrid vehicles and electric vehicles, higher-capacity and higher-output secondary batteries are required.

[0003] Patent Document 1 describes a vehicle in which a battery pack composed of a plurality of battery modules is arranged below the passenger compartment. In the vehicle described in Patent Document 1, a rapid charging port and a normal charging port are provided at the rear of the vehicle, and at the rear of the battery pack, a connector to which a rapid charging harness for electrically connecting the rapid charging port and the battery pack is connected, and a connector to which a normal charging harness for electrically connecting the normal charging port and the battery pack via a charger is connected, are provided.

[0004] In the vehicle described in Patent Document 1, high-voltage and large-current electric power flows through the rapid charging harness and the normal charging harness. Therefore, in the battery pack mounted on the vehicle described in Patent Document 1, in order to protect the two connectors, a part of the stepped portion of the upper cover is recessed to form a rear-side connection portion, and the two connectors are arranged in this rear-side connection portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the battery pack mounted on the vehicle described in Patent Document 1, in order to form the rear connection portion by depressing a part of the stepped portion of the upper cover, it is necessary to arrange a relay and a fuse at a position protruding to the right from the battery module. Therefore, there has been a problem that the utilization efficiency of the space inside and around the battery pack is reduced.

[0007] The present invention provides a battery pack that can efficiently utilize the space inside and around the battery pack while protecting the connector portion.

Means for Solving the Problems

[0008] The present invention is a battery pack in which a plurality of battery modules in which a plurality of battery cells are stacked are accommodated, the battery pack includes a bottom plate portion that covers the lower portions of the plurality of battery modules, a front wall portion that stands upward and extends in the left - right direction at the front of the bottom plate portion, a rear wall portion that stands upward and extends in the left - right direction at the rear of the bottom plate portion, a left wall portion that stands upward and extends in the front - rear direction at the left portion of the bottom plate portion, a right wall portion that stands upward and extends in the front - rear direction at the right portion of the bottom plate portion, and has a lower case with an open upper part, an upper cover that covers the upper part of the lower case, a battery pack internal space surrounded by the lower case and the upper cover is formed, the plurality of battery modules are three or more odd numbers, and are arranged in even columns in the left - right direction and in rows in the front - rear direction in the battery pack internal space, at least one of the front wall portion and the rear wall portion, when viewed from above and below, A step portion extending in the front-rear direction, a convex wall portion that bends from an end portion of the step portion on the side far from the center in the front-rear direction of the battery pack and extends in the left-right direction, and a concave wall portion that bends from an end portion of the step portion on the side close to the center in the front-rear direction of the battery pack and extends in the left-right direction. In the internal space of the battery pack, at least a part of at least one of the battery modules is disposed in a space surrounded by the convex wall portion, the step portion, and the left wall portion or the right wall portion when viewed from the up-down direction. A connector portion for electrically connecting the internal space of the battery pack and the outside of the battery pack is provided in the concave wall portion. and a plurality of the battery modules are arranged in two rows in the left - right direction and in a line in the front - rear direction within the internal space of the battery pack; a collision receiving structure extending in the front - rear direction is provided between the battery modules arranged in the left - right direction within the internal space of the battery pack; the collision receiving structure extends in the front - rear direction to a position farther from the center in the front - rear direction of the battery pack than the connector portion, and overlaps with the stepped portion when viewed from the up - down direction 。

Advantages of the Invention

[0009] According to the present invention, it is possible to efficiently use the space inside the battery pack and around the battery pack while protecting the connector portion.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiment for Carrying out the Invention

[0011] Hereinafter, an embodiment of a vehicle equipped with the battery pack of the present invention will be described with reference to the accompanying drawings. Note that the drawings are to be viewed in the direction of the reference numerals. Also, in this specification and the like, for the sake of simplicity and clarity of the description, the front-rear, left-right, and up-down directions are described according to the direction seen from the driver of the vehicle, and in the drawings, the front of the vehicle is shown as Fr, the rear as Rr, the left as L, the right as R, the upper as U, and the lower as D.

[0012] [Overall Configuration of the Vehicle] As shown in FIG. 1, the vehicle V of the present embodiment has a pair of left and right front wheels FW and a pair of left and right rear wheels RW, and a floor panel FP that constitutes the floor of the vehicle V. The vehicle V is partitioned into a passenger compartment CB and a front room FRM in front of it by a dash panel DP that extends vertically above the floor panel FP. A front seat FS and a rear seat RS are provided in the passenger compartment CB.

[0013] Below the floor panel FP, a battery pack 20 is arranged. The battery pack 20 is arranged below the floor panel FP and under the floor of the passenger compartment CB.

[0014] The vehicle V includes a power unit PU, a charging and discharging control device CHGR that controls the input and output power of the battery pack 20, and a power transmission mechanism (not shown) that transmits the power of the power unit PU to the pair of left and right front wheels FW and / or the pair of left and right rear wheels RW. The power unit PU is arranged below the floor panel FP behind the rear seat RS. The charging and discharging control device CHGR is arranged in the front room FRM.

[0015] The vehicle V is provided with a power receiving unit PR capable of receiving power from an external power source. In the present embodiment, the power receiving unit PR is provided on the upper surface of the front room FRM and is electrically connected to the charging and discharging control device CHGR.

[0016] The charging and discharging control device CHGR is a power device that includes an inverter and a DC-DC converter and controls the charging and discharging of the battery pack 20. The charging and discharging control device CHGR receives AC power for general households from an external power source via the power receiving unit PR. The charging and discharging control device CHGR can convert the AC power received from the power receiving unit PR into DC power, step up and down the voltage to a predetermined voltage, and supply power to the battery pack 20. It is also a power converter that can step up and down the DC power charged in the battery pack 20 to a predetermined voltage and convert it into AC power, and supply power to a household power source, electrical equipment, etc. from a power supply unit (not shown).

[0017] The power unit PU includes a driving motor MOT that is a power source of the vehicle V and a control device PCU that controls the driving motor MOT. When the power stored in the battery pack 20 is supplied to the driving motor MOT via the control device PCU, the driving motor MOT operates to generate a driving force for driving the vehicle V.

[0018] As shown in FIG. 2, the battery pack 20 includes a lower case 40 with an open upper part and an upper cover 50 that covers the upper part of the lower case 40. And a battery pack internal space 60 surrounded by the lower case 40 and the upper cover 50 is formed in the battery pack 20.

[0019] As shown in FIGS. 3 to 5, the battery pack 20 houses a plurality of battery modules 21, a first junction board 31, and a second junction board 32. The plurality of battery modules 21, the first junction board 31, and the second junction board 32 are housed in the battery pack internal space 60.

[0020] The lower case 40 includes a bottom plate portion 41 that covers the lower portions of the plurality of battery modules 21, a front wall portion 42 that stands upward and extends in the left - right direction at the front of the bottom plate portion 41, a rear wall portion 43 that stands upward and extends in the left - right direction at the rear of the bottom plate portion 41, a left wall portion 44 that stands upward and extends in the front - rear direction at the left portion of the bottom plate portion 41, and a right wall portion 45 that stands upward and extends in the front - rear direction at the right portion of the bottom plate portion 41. The internal space 60 of the battery pack is a space surrounded by the bottom plate portion 41, the front wall portion 42, the rear wall portion 43, the left wall portion 44, and the right wall portion 45.

[0021] The rear wall portion 43 has a stepped portion 431 that extends in the front - rear direction at approximately the center in the left - right direction when viewed from the up - down direction, a convex wall portion 432 that bends from the rear end portion of the stepped portion 431 and extends in the right direction, and a concave wall portion 433 that bends from the front end portion of the stepped portion 431 and extends in the left direction. Therefore, the internal space 60 of the battery pack is a space where the right - hand side region protrudes rearward when viewed from the up - down direction.

[0022] The battery module 21 has a substantially rectangular parallelepiped shape. The battery module 21 has a plurality of battery cells stacked therein. The plurality of battery cells of the battery module 21 are electrically connected by a bus bar plate (not shown) or the like. At the upper part of the battery module 21, a plus terminal 221 and a minus terminal 222, which are input - output terminals for power transfer between the battery module 21 and external electrical equipment, are provided (see Figure ☆). In the present embodiment, the plus terminal 221 and the minus terminal 222 are arranged side by side in the short - hand direction at one end in the longitudinal direction when viewed from the up - down direction at the upper part of the battery module 21.

[0023] The battery module 21 is arranged in the internal space 60 of the battery pack such that the longitudinal direction as viewed from the vertical direction extends in the vehicle width direction and the short side direction extends in the front-rear direction. Further, the battery module 21 is arranged in the internal space 60 of the battery pack such that the side where the plus terminal 221 and the minus terminal 222 are provided is the center side in the vehicle width direction in the longitudinal direction. An odd number of battery modules 21 are accommodated in the internal space 60 of the battery pack 20. In the present embodiment, 13 battery modules 21 are accommodated in the internal space 60 of the battery pack 20.

[0024] A plurality of battery modules 21 are arranged in two rows in the left-right direction and arranged side by side in the front-rear direction in the internal space 60 of the battery pack. In the present embodiment, seven battery modules 21 are arranged side by side in the front-rear direction in the right column, and six battery modules 21 are arranged side by side in the front-rear direction in the left column.

[0025] Then, in the internal space 60 of the battery pack, at least a part of the battery module 21 arranged at the rearmost part of the right column is arranged in the space surrounded by the convex wall portion 432, the stepped portion 431, and the right wall portion 45 as viewed from the vertical direction. That is, in the internal space 60 of the battery pack, at least a part of the battery module 21 arranged at the rearmost part of the right column is arranged in the space protruding rearward in the right region as viewed from the vertical direction.

[0026] A collision receiving structure 46 extending in the front-rear direction is provided between the battery modules 21 arranged in two rows in the left-right direction at substantially the center portion in the left-right direction in the internal space 60 of the battery pack. In the present embodiment, the collision receiving structure 46 is a rib protruding upward from the bottom plate portion 41. The collision receiving structure 46 extends in the front-rear direction over substantially the entire front-rear direction of the lower case 40 from the front wall portion 42 to the rear wall portion 43. Note that the collision receiving structure 46 does not necessarily need to continuously extend from the front wall portion 42 to the rear wall portion 43, and a part thereof may be interrupted and extend in the front-rear direction from the front wall portion 42 to the rear wall portion 43.

[0027] The collision receiving structure 46 overlaps with the stepped portion 431 in the rear wall portion 43 when viewed from the vertical direction.

[0028] The first junction board 31 is housed in the internal space 60 of the battery pack and is disposed near the front end of the battery pack 20. More specifically, the first junction board 31 is disposed above the battery modules 21 arranged side by side in the left - right direction at the foremost position in the internal space 60 of the battery pack so as to straddle the battery modules 21 arranged side by side in the left - right direction at the foremost position.

[0029] The second junction board 32 is housed in the internal space 60 of the battery pack and is disposed near the rear end of the battery pack 20. More specifically, the second junction board 32 is disposed above the battery module 21 disposed at the rearmost position in the right - hand column, that is, the battery module 21 at least partially disposed in the space protruding rearward in the right - hand region of the internal space 60 of the battery pack.

[0030] Furthermore, a high - voltage power line 71 connecting the first junction board 31 and the second junction board 32 is routed in the internal space 60 of the battery pack.

[0031] The first junction board 31 is electrically connected to the charging / discharging control device CHGR described above. The first junction board 31 and the charging / discharging control device CHGR are electrically connected by a power cable 91 (see FIG. 1). Power received from outside the vehicle V by the power receiving unit PR is supplied from the charging / discharging control device CHGR to the first junction board 31. Also, the first junction board 31 is electrically connected to an air - conditioning device (not shown) or the like that is mounted on the vehicle V and air - conditions the passenger compartment CB. And the first junction board 31 can output the electric power stored in each battery module 21 to the charging / discharging control device CHGR and the air - conditioning device (not shown) or the like.

[0032] The first junction board 31 is provided with a circuit breaker such as a fuse. When abnormal power is applied to the first junction board 31, the power supply is cut off by the circuit breaker such as a fuse, and the battery module 21, the second junction board 32, the charge / discharge control device CHGR, the power unit PU, an air conditioner (not shown), etc. are protected.

[0033] The second junction board 32 is electrically connected to the first junction board 31 by the high-voltage power line 71. Also, the second junction board 32 is electrically connected to the battery module 21.

[0034] The second junction board 32 is provided with a switching element, and controls the input / output of power in the battery module 21 by opening / closing control of the switching element.

[0035] The battery pack 20 includes a plurality of bus bars 72 that electrically connect the minus terminal 222 of the battery module 21 and the plus terminal 221 of the battery module 21 adjacent in the front-rear direction. The battery pack 20 further includes a bus bar (not shown) that electrically connects the minus terminal 222 of one of the left and right battery modules 21 arranged at the forefront and the plus terminal 221 of the other of the left and right battery modules 21 arranged at the forefront. In this way, in the present embodiment, the 13 battery modules 21 are connected in series.

[0036] Also, the battery pack 20 further includes a plus-side bus bar 73 that electrically connects the second junction board 32 and the plus terminal 221 of the battery module 21 arranged at the rearmost of the left column in the battery pack internal space 60, and a minus-side bus bar 74 that electrically connects the second junction board 32 and the minus terminal 222 of the battery module 21 arranged at the rearmost of the right column.

[0037] In this way, the second junction board 32 is electrically connected to the 13 battery modules 21 connected in series.

[0038] As described above, the battery module 21 is arranged in the internal space 60 of the battery pack such that, in the longitudinal direction, the side where the plus terminal 221 and the minus terminal 222 are provided is the center side in the vehicle width direction. Therefore, each bus bar 72 for electrically connecting the battery modules 21 adjacent to each other in the front-rear direction is provided between the battery modules arranged in the left-right direction and extends in the front-rear direction.

[0039] The high-voltage power line 71 is routed in the front-rear direction between the battery modules arranged in the left-right direction. In the present embodiment, the high-voltage power line 71 is routed in the front-rear direction between the battery modules arranged in the left-right direction below each bus bar 72 for electrically connecting the battery modules 21 adjacent to each other in the front-rear direction.

[0040] Therefore, since the high-voltage power line 71 is routed in the front-rear direction between the battery modules 21 arranged in the left-right direction where the impact receiving structure 46 is provided in the internal space 60 of the battery pack, the high-voltage power line 71 connecting the charging / discharging control device CHGR and the drive motor MOT can be protected, and the collision safety of the vehicle V is improved.

[0041] As shown in FIGS. 6 and 7, an output terminal portion 81 is provided in the internal space 60 of the battery pack in a region behind the battery module 21 arranged on the left side of the second junction board 32 and at the rearmost position of the left column. The output terminal portion 81 has a plus terminal 81a and a minus terminal 81b. Further, an output bus bar 75 for electrically connecting the second junction board 32 and the output terminal portion 81 is provided in the internal space 60 of the battery pack. Two output bus bars 75 are provided. One electrically connects the second junction board 32 and the plus terminal 81a of the output terminal portion 81, and the other electrically connects the second junction board 32 and the minus terminal 81b of the output terminal portion 81.

[0042] In the recessed wall portion 433 formed in the rear wall portion 43 of the lower case 40, a connector portion 82 for electrically connecting the battery pack internal space 60 and the outside of the battery pack 20 is provided. The connector portion 82 is provided behind the output terminal portion 81 provided in the battery pack internal space 60.

[0043] A connector plug of a power cable 92 (see FIG. 1) connected to the power unit PU is inserted into the connector portion 82, and the output terminal portion 81 provided in the battery pack internal space 60 and the power cable 92 are electrically connected.

[0044] Therefore, the high-voltage power line 71 connects the charging / discharging control device CHGR and the drive motor MOT of the power unit PU via the first junction board 31 and the second junction board 32 as described above.

[0045] And, since the connector portion 82 for electrically connecting the battery pack internal space 60 and the outside of the battery pack 20 is provided in the recessed wall portion 433, the convex wall portion 432 can be used as a protection structure for the connector portion 82.

[0046] Furthermore, in the battery pack internal space 60, at least a part of at least one battery module 21 is arranged in the space surrounded by the convex wall portion 432, the stepped portion 431, and the right wall portion 45 when viewed from the vertical direction. As a result, the battery pack 20 can be arranged without reducing the space efficiency of the battery pack internal space 60, and the convex wall portion 432 can be used as a protection structure for the connector portion 82. Therefore, while protecting the connector portion 82, the space inside and around the battery pack 20 can be efficiently utilized.

[0047] Also, as described above, the impact receiving structure 46 overlaps with the stepped portion 431 when viewed in the vertical direction. Therefore, the impact receiving structure 46 extends in the front-rear direction to a position behind the connector portion 82. For this reason, the stepped portion 431 also functions as part of the impact receiving structure 46. Thereby, the connector portion 82 can be more reliably protected.

[0048] Furthermore, in the vicinity of the connection portion between the convex wall portion 432 and the stepped portion 431, an impact receiving portion 47 protruding rearward from the convex wall portion 432 is formed. The impact receiving portion 47 is provided at a position where at least a part thereof overlaps with the impact receiving structure 46 when viewed in the front-rear direction.

[0049] Thereby, due to the impact receiving portion 47 formed on the convex wall portion 432, a load is input to the impact receiving portion 47 prior to the convex wall portion 432, and furthermore, the load input to the impact receiving portion 47 is transmitted to the impact receiving structure 46. Therefore, deformation of the convex wall portion 432 can be suppressed, and the connector portion 82 can be more reliably protected.

[0050] As described above, an embodiment of the present invention has been described with reference to the accompanying drawings. Needless to say, the present invention is not limited to such an embodiment. It is obvious that those skilled in the art can conceive of various modification examples or correction examples within the scope described in the claims, and it is naturally understood that they also belong to the technical scope of the present invention. Also, within the scope not departing from the gist of the invention, the components in the above embodiment may be arbitrarily combined.

[0051] For example, in the present embodiment, it is assumed that the plurality of battery modules 21 are arranged in two rows in the left-right direction and in a line in the front-rear direction in the internal space 60 of the battery pack. However, they may be arranged in any even number of rows or more in the left-right direction and in a line in the front-rear direction.

[0052] Also, for example, in the present embodiment, although it is assumed that 13 battery modules 21 are accommodated in the internal space 60 of the battery pack 20, any odd number of battery modules 21 other than 13 may be accommodated.

[0053] Also, for example, in the present embodiment, the convex wall portion 432 bends from the rear end portion of the stepped portion 431 and extends rightward, and the concave wall portion 433 bends from the front end portion of the stepped portion 431 and extends leftward. However, the convex wall portion 432 may bend from the rear end portion of the stepped portion 431 and extend leftward, and the concave wall portion 433 may bend from the front end portion of the stepped portion 431 and extend rightward. In this case, the battery modules 21 are arranged in two left - right rows in the front - rear direction such that the left - hand row has one more module than the right - hand row. In the internal space 60 of the battery pack, when viewed from the vertical direction, at least a part of the battery module 21 arranged at the rearmost position of the left - hand row is arranged in the space surrounded by the convex wall portion 432, the stepped portion 431, and the left wall portion 44. That is, in the internal space 60 of the battery pack, when viewed from the vertical direction, at least a part of the battery module 21 arranged at the rearmost position of the left - hand row is arranged in the space protruding rearward in the left - hand region.

[0054] Also, for example, in the present embodiment, the stepped portion 431, the convex wall portion 432, and the concave wall portion 433 are formed on the rear wall portion 43, and the connector portion 82 is provided on the rear wall portion 43. However, the stepped portion 431, the convex wall portion 432, and the concave wall portion 433 may be formed on the front wall portion 42, and the connector portion 82 may be provided on the front wall portion 42.

[0055] Further, for example, in the present embodiment, the high-voltage power line 71 electrically connects the charging / discharging control device CHGR mounted in the front room FRM and the drive motor MOT of the power unit PU mounted at the rear of the rear seat RS. However, the high-voltage power line 71 may electrically connect a power device other than the charging / discharging control device CHGR mounted in the front room FRM and the drive motor MOT of the power unit PU mounted at the rear of the rear seat RS. For example, a control device PCU for controlling the drive motor MOT is mounted in the front room FRM, and the high-voltage power line 71 may electrically connect the control device PCU and the drive motor MOT mounted at the rear of the rear seat RS.

[0056] The present specification describes at least the following matters. In parentheses, corresponding components, etc. in the above-described embodiment are shown as an example, but the present invention is not limited thereto.

[0057] (1) A battery pack (battery pack 20) in which a plurality of battery modules (battery module 21) in which a plurality of battery cells are stacked are accommodated, The battery pack includes: a bottom plate portion (bottom plate portion 41) that covers the lower portions of the plurality of battery modules; a front wall portion (front wall portion 42) that stands upward and extends in the left-right direction at the front of the bottom plate portion; a rear wall portion (rear wall portion 43) that stands upward and extends in the left-right direction at the rear of the bottom plate portion; a left wall portion (left wall portion 44) that stands upward and extends in the front-rear direction at the left portion of the bottom plate portion; a right wall portion (right wall portion 45) that stands upward and extends in the front-rear direction at the right portion of the bottom plate portion, and has a lower case (lower case 40) with an open upper portion; an upper cover (upper cover 50) that covers the upper portion of the lower case; a battery pack internal space (battery pack internal space 60) surrounded by the lower case and the upper cover is formed; The plurality of battery modules are an odd number of 3 or more, and are arranged in even columns in the left-right direction and in rows in the front-back direction within the internal space of the battery pack. At least one of the front wall portion and the rear wall portion, when viewed from the up-down direction, has a step portion (step portion 431) extending in the front-back direction, a convex wall portion (convex wall portion 432) that bends from an end portion of the step portion on the side far from the center in the front-back direction of the battery pack and extends to one side in the left-right direction, and a concave wall portion (concave wall portion 433) that bends from an end portion of the step portion on the side close to the center in the front-back direction of the battery pack and extends to the other side in the left-right direction. Within the internal space of the battery pack, when viewed from the up-down direction, at least a part of at least one of the battery modules is arranged in a space surrounded by the convex wall portion, the step portion, and the left wall portion or the right wall portion. A connector portion (connector portion 82) for electrically connecting the internal space of the battery pack and the outside of the battery pack is provided in the concave wall portion. Battery pack.

[0058] According to (1), within the internal space of the battery pack, when viewed from the up-down direction, by arranging at least a part of at least one of the battery modules in a space surrounded by the convex wall portion, the step portion, and the left wall portion or the right wall portion, the battery modules can be arranged without reducing the space efficiency of the internal space of the battery pack, and the convex wall portion can be used as a protection structure for the connector portion. Therefore, while protecting the connector portion, the space inside the battery back and around the battery pack can be efficiently utilized.

[0059] (2) The battery pack according to (1), wherein the plurality of battery modules are arranged in two columns in the left-right direction and in rows in the front-back direction within the internal space of the battery pack. In the internal space of the battery pack, a collision receiving structure (collision receiving structure 46) extending in the front-rear direction between the battery modules arranged in the left-right direction is provided. The collision receiving structure extends in the front-rear direction to a position farther from the center in the front-rear direction of the battery pack than the connector portion, and overlaps with the stepped portion when viewed from the up-down direction. Battery pack.

[0060] (2) According to this, since the collision receiving structure extends in the front-rear direction to a position farther from the center in the front-rear direction of the battery pack than the connector portion and overlaps with the stepped portion when viewed from the up-down direction, the stepped portion also functions as part of the collision receiving structure. Thereby, the connector portion can be protected more reliably.

[0061] (3) The battery pack according to (2), On the convex wall portion, a collision receiving portion (collision receiving portion 47) protruding in a direction farther from the center in the front-rear direction of the battery pack in the front-rear direction is formed. The collision receiving portion is provided at a position where at least a part thereof overlaps with the collision receiving structure when viewed from the front-rear direction. Battery pack.

[0062] (3) According to this, due to the collision receiving portion formed on the convex wall portion, a load is input to the collision receiving portion prior to the convex wall portion, and further, the load input to the collision receiving portion is transmitted to the collision receiving structure, so that deformation of the convex wall portion can be suppressed and the connector portion can be protected more reliably.

[0063] (4) The battery pack according to (2) or (3), The battery pack is equipped with a drive motor (drive motor MOT) operable with the electric power stored in the battery pack, and a power device (charge / discharge control device CHGR) for controlling the input / output electric power of the battery pack, and is mounted on a vehicle (vehicle V). Inside the battery pack internal space, a power line (high-voltage power line 71) that connects the power equipment and the drive motor is routed, The power line is routed in the front-rear direction between the battery modules arranged in the left-right direction in the battery pack internal space. Battery pack.

[0064] According to (4), a power line that connects the power control device and the drive motor is routed in the battery pack internal space, and the power line is routed in the front-rear direction between the battery modules arranged in the left-right direction in the battery pack internal space where a collision-receiving structure is provided. Therefore, the power line that connects the power control device and the drive motor can be protected, and the collision safety of the vehicle is improved.

Explanation of symbols

[0065] 20 Battery pack 21 Battery module 40 Lower case 41 Bottom plate part 42 Front wall part 43 Rear wall part 431 Step part 432 Convex wall part 433 Concave wall part 44 Left wall part 45 Right wall part 50 Upper cover 60 Battery pack internal space 71 High-voltage power line (power line) 82 Connector part CHGR Charging control device (power equipment) MOT Drive motor V Vehicle

Claims

1. A battery pack in which a plurality of battery modules each having a plurality of stacked battery cells are accommodated, wherein the battery pack includes: a bottom plate portion that covers the lower portions of the plurality of battery modules; a front wall portion that stands upward and extends in the left-right direction at the front of the bottom plate portion; a rear wall portion that stands upward and extends in the left-right direction at the rear of the bottom plate portion; a left wall portion that stands upward and extends in the front-rear direction at the left portion of the bottom plate portion; a right wall portion that stands upward and extends in the front-rear direction at the right portion of the bottom plate portion, and has a lower case with an open upper portion; an upper cover that covers the upper portion of the lower case; a battery pack internal space surrounded by the lower case and the upper cover is formed; the plurality of battery modules are three or more odd numbers, and are arranged in even columns in the left-right direction and in rows in the front-rear direction in the battery pack internal space; at least one of the front wall portion and the rear wall portion has, when viewed from the up-down direction, a step portion extending in the front-rear direction; a convex wall portion that bends from an end of the step portion on the side far from the center in the front-rear direction of the battery pack and extends in one side in the left-right direction; a concave wall portion that bends from an end of the step portion on the side close to the center in the front-rear direction of the battery pack and extends in the other side in the left-right direction; in the battery pack internal space, at least a part of at least one of the battery modules is arranged in a space surrounded by the convex wall portion, the step portion, and the left wall portion or the right wall portion when viewed from the up-down direction; a connector portion for electrically connecting the battery pack internal space and the outside of the battery pack is provided in the concave wall portion; the plurality of battery modules are arranged in two columns in the left-right direction and in rows in the front-rear direction in the battery pack internal space; a collision receiving structure extending in the front-rear direction is provided between the battery modules arranged in the left-right direction in the battery pack internal space; the collision receiving structure extends in the front-rear direction to a position farther from the center in the front-rear direction of the battery pack than the connector portion, and overlaps the step portion when viewed from the up-down direction; A battery pack.

2. The battery pack according to claim 1, wherein a collision receiving portion protruding in a direction away from the center in the front-rear direction of the battery pack is formed on the convex wall portion in the front-rear direction. The collision receiving portion is provided at a position where at least a part thereof overlaps with the collision receiving structure when viewed in the front-rear direction. Battery pack.

3. The battery pack according to claim 1 or 2, wherein the battery pack is mounted on a vehicle including a drive motor operable with electric power stored in the battery pack, and a power device that controls the input / output electric power of the battery pack, and power lines connecting the power device and the drive motor are routed in the internal space of the battery pack, and the power lines are routed in the front-rear direction between the battery modules arranged side by side in the left-right direction in the internal space of the battery pack. Battery pack.

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