WO2019225701A1

WO2019225701A1 - Battery pack

Info

Publication number: WO2019225701A1
Application number: PCT/JP2019/020477
Authority: WO
Inventors: 松元隆志
Original assignee: 本田技研工業株式会社
Priority date: 2018-05-24
Filing date: 2019-05-23
Publication date: 2019-11-28
Also published as: JP7307721B2; JPWO2019225701A1

Abstract

A battery pack (10) according to the present invention is provided with: batter core packs (14a, 14b); a case (12); and a support frame (18) which supports the batter core packs (14a, 14b) within the case (12). The case (12) has a first case wall (32), a second case wall (36) and a curved case corner part (40). The support frame (18) has a first frame wall (64), a second frame wall (66) and a frame corner part (68). The space between an inner surface (32a) of the first case wall (32) and an outer surface (64a) of the first frame wall (64) is at least partially filled with a first contact part (44). The space between an inner surface (36a) of the second case wall (36) and an outer surface (66a) of the second frame wall (66) is at least partially filled with a second contact part (46).

Description

Battery pack

The present invention relates to a battery pack including a battery core pack having a plurality of battery cells held by a cell holder and a case for housing the battery core pack.

For example, as described in JP-T-2016-534518, as a battery pack that is detachably mounted on an electric vehicle or the like, a battery core pack having a plurality of battery cells held by a cell holder, and the battery core pack And a case for housing the battery are known.

In this type of battery pack, it is conceivable that a support frame for supporting the battery core pack is provided inside the case in order to suppress backlash of the battery core pack in the case and improve durability.

In the case, the inner surface of the corner portion of the case faces the outer surface of the corner portion of the support frame. Of the case and the support frame, at least the corner portion of the case is curved. In other words, at least the corner of the case is rounded. In this case, in order to suppress backlash between the case and the support frame and to further improve the durability of the battery pack, for example, the same curvature as the case curvature is provided at the corner of the support frame. High-precision processing is required and is complicated.

Therefore, an object of the present invention is to provide a battery pack capable of easily improving durability with a simple configuration.

One aspect of the present invention is a battery pack comprising: a battery core pack having a plurality of battery cells held by a cell holder; and a case for housing the battery core pack, wherein the battery core pack is disposed inside the case. A support frame that supports the case, and the case includes a first case wall, a second case wall, a case corner portion that is formed at a ridge portion of the first case wall and the second case wall, and is curved. The support frame has a first frame wall, a second frame wall, and a frame corner portion formed at a ridge portion of the first frame wall and the second frame wall, and An inner surface of the case corner portion is opposed to an outer surface of the frame corner portion, and an inner surface of the first case wall and an outer surface of the first frame wall that face each other inside the case. A second abutting portion is provided to at least partially fill the gap between the inner side surface of the second case wall and the outer side surface of the second frame wall facing each other inside the case. A contact portion is provided.

In this battery pack, the case and the support frame have a simple configuration in which the first contact portion and the second contact portion are provided regardless of whether or not the frame corner portion has the same curvature as that of the case corner portion. Can be suppressed. That is, the durability of the battery pack can be easily improved with a simple configuration.

1 is a schematic perspective view of a battery pack according to an embodiment of the present invention. It is a disassembled perspective view of the battery pack which decomposed | disassembled the bottom case, the outer shell case, and the top case. It is a disassembled perspective view of a support frame and a battery group. It is a plane sectional view of a battery pack for explaining the 1st contact part and the 2nd contact part. It is a perspective view of an outer shell case for explaining the 1st contact part and the 2nd contact part. It is a disassembled perspective view of a battery core pack. It is a plane sectional view of a battery pack for explaining the 1st contact part and the 2nd contact part concerning a modification.

Preferred embodiments of the battery pack according to the present invention will be described in detail with reference to the accompanying drawings. In the following drawings, components having the same or similar functions and effects are denoted by the same reference numerals, and repeated description may be omitted.

The battery pack 10 shown in FIG. 1 can be suitably applied to, for example, a portable drive power supply that is detachably mounted on an electric vehicle (not shown) such as an electric assist bicycle, an electric motorcycle, or an electric vehicle. . Therefore, an example in which the battery pack 10 is mounted on an electric vehicle will be described below. The vertical direction of the battery pack 10 is based on the vertical direction (the directions of arrows X1 and X2 in FIG. 1) when the battery pack 10 is mounted on an electric vehicle. However, the present invention is not particularly limited thereto, and the battery pack 10 can be applied to various devices that require electric power.

As shown in FIG. 2, the battery pack 10 includes a case 12 constituting an exterior, a battery group 16 in which two battery core packs 14 a and 14 b are connected, and a battery group 16 (battery core pack 14 a inside the case 12. , 14b), a battery management device (Battery Management Unit: BMU) 20, and a connector unit (not shown).

The case 12 can be formed of, for example, a metal such as aluminum, a resin (including a fiber reinforced resin), or the like, and accommodates a substantially square columnar battery group 16 (

battery core packs

14a and 14b). The case 12 includes a bottom case 22 that covers the bottom surface of the battery group 16, an outer case 24 that covers the

side surfaces

16a, 16b, 16c, and 16d (see FIG. 3) of the battery group 16, and a top case that covers the top surface of the battery group 16. 26.

The bottom case 22 is a housing whose upper end is open. For example, a hollow cylindrical or truncated cone-shaped projection 28 that protrudes toward the upper side (arrow X1 side) is provided at each of the four corners of the bottom surface. ing. An insertion hole 28 a through which a shaft portion of a bolt 30 (see FIG. 3) described later is inserted is formed on the distal end surface of the protruding portion 28. In addition, the above-described connector portion and the like are accommodated in the bottom case 22.

The connector portion is exposed to the outside of the case 12 through, for example, a notch formed on the bottom wall of the bottom case 22, and is used as a power supply port of the electric vehicle or a charging device for charging the battery group 16. Connection is possible. Note that the notch, the power supply port, and the charging device are not shown. By connecting the connector portion to the power supply port or the charging device, the power supply port or the charging device and the battery group 16 can be electrically connected via the BMU 20 by a lead wire (not shown) or the like.

As shown in FIGS. 4 and 5, the outer shell case 24 has a rectangular tube shape, a pair of first case walls 32 facing each other, a pair of second case walls 36 facing each other, and a first case wall 36. A curved corner portion 40 is formed at each of the edges of the case wall 32 and the second case wall 36. That is, the case corner portion 40 is formed at each of the four corners of the outer shell case 24.

In addition, as shown in FIG. 4, the first case wall 32 and the second case wall 36 are interposed via a case corner portion 40 that is curved in a cross section perpendicular to the ridge direction (arrow X1 and X2 direction) of the outer shell case 24. Are connected. In other words, a so-called round is attached to the case corner portion 40. The radius of the radius of the case corner portion 40 is not particularly limited, and can be set as appropriate according to the specifications of the battery pack 10 and the like.

On the inner side surface 32 a of the first case wall 32, there are protrusions protruding in the vicinity of the case corner portion 40 along the perpendicular direction of the inner side surface 32 a and extending along the ridge direction of the case corner portion 40. One abutting portion 44 is provided integrally. Further, on the inner side surface 36 a of the second case wall 36, a protrusion that protrudes in the vicinity of the case corner portion 40 along the perpendicular direction of the inner side surface 36 a and extends along the ridge direction of the case corner portion 40. The second contact portion 46 is integrally provided.

As shown in FIG. 5, in the present embodiment, each of the first contact portion 44 and the second contact portion 46 extends from one end to the other end in the ridge direction of the outer shell case 24. Further, the protruding length of the first contact portion 44 with respect to the inner side surface 32 a of the first case wall 32 is smaller than the thickness of the first case wall 32. The protruding length of the second contact portion 46 with respect to the inner side surface 36 a of the second case wall 36 is smaller than the thickness of the second case wall 36. Note that the protruding length of the first abutting portion 44 and the protruding length of the second abutting portion 46 may be the same or different. Furthermore, each of the front end surface 44a of the first contact portion 44 and the front end surface 46a of the second contact portion 46 is a flat surface.

As shown in FIGS. 2 and 5, an upper opening 24 a is provided at the upper end of the outer shell case 24, and a lower opening 24 b is provided at the lower end of the outer shell case 24. The bottom case 22, the outer shell case 24, and the top case 26 are integrated with the lower opening 24b covered with the bottom case 22 and the upper opening 24a covered with the top case 26 (FIG. 1). reference). The battery group 16, the support frame 18, the BMU 20, and the like are accommodated in the internal space of the case 12 formed thereby.

As shown in FIG. 2, the top case 26 is a housing having an open lower end, and is provided with a handle 26a that can be gripped when carrying the battery pack 10 on the upper surface side. Further, at the four corners on the lower surface side of the top case 26, for example, female screws (not shown) that are screwed with male screws 50a provided on shafts of bolts 50 (see FIG. 3) described later are provided. The support frame 18 is coupled to the lower surface side of the top case 26 through the male screw 50a and the female screw.

As shown in FIG. 3, the support frame 18 is made of, for example, metal and has a first frame 52 and a second frame 54. The first frame 52 is provided along a ridge line on the side surface 16 a side of the pair of side surfaces 16 a and 16 b facing each other of the battery group 16. The second frame 54 is provided along the ridge line on the other side surface 16 b side of the battery group 16.

Specifically, each of the first frame 52 and the second frame 54 is configured by connecting a bottom member 60 and a covering member 62. The bottom member 60 of the first frame 52 extends along the bottom side of the side surface 16 a of the battery group 16. The covering member 62 of the first frame 52 includes a pair of side portions 62a extending along a pair of sides extending in the vertical direction, and an upper end portion extending along the upper side, of the sides excluding the bottom side of the side surface 16a of the battery group 16. 62b. In addition, an extending portion 62 c is provided at the lower end of the side portion 62 a along a part of the bottom side of the side surface 16 a of the battery group 16.

The bottom member 60 of the second frame 54 is along the bottom side of the side surface 16b of the battery group 16. The covering member 62 of the second frame 54 includes a pair of side portions 62a extending along a pair of sides extending in the vertical direction, and an upper end portion extending along the upper side, of the sides excluding the bottom side of the side surface 16b of the battery group 16. 62b. In addition, an extending portion 62c is provided at a lower end of the side portion 62a along a part of the bottom side of the side surface 16b of the battery group 16.

The side portions 62 a of the first frame 52 and the second frame 54 are formed on the first frame wall 64, the second frame wall 66, and the ridges of the first frame wall 64 and the second frame wall 66. Each has a corner portion 68. As shown in FIG. 4, the frame corner portion 68 is provided so as to cover the ridges at the four corners of the battery group 16. Further, inside the outer shell case 24, the outer side surface 68 a of the frame corner portion 68 faces the inner side surface 40 a of the case corner portion 40 with a space therebetween. The frame corner portion 68 may be curved or may not be curved.

The first frame wall 64 covers a part of the side surface 16a or the side surface 16b of the battery group 16. In the outer shell case 24, the outer side surface 64 a of the first frame wall 64 faces the inner side surface 32 a of the first case wall 32 with a space therebetween. The front end surface 44 a of the first contact portion 44 that protrudes from the inner side surface 32 a of the first case wall 32 abuts on the outer side surface 64 a of the first frame wall 64. In the cross section of the side portion 62a orthogonal to the ridge direction of the frame corner portion 68, the length of the first frame wall 64 in the direction along the first case wall 32 (arrow Y1, Y2 direction) is the first contact in the same direction. It is longer than the length of the portion 44. Therefore, the space between the outer side surface 64 a of the first frame wall 64 and the inner side surface 32 a of the first case wall 32 is partially filled by the first contact portion 44.

The second frame wall 66 covers a part of the side surface 16c or the side surface 16d of the battery group 16. Further, in the outer shell case 24, the outer side surface 66 a of the second frame wall 66 faces the inner side surface 36 a of the second case wall 36 with a space therebetween. Further, the outer end surface 66 a of the second frame wall 66 abuts the tip end surface 46 a of the second abutting portion 46 protruding from the inner side surface 36 a of the second case wall 36. In the cross section of the side portion 62a orthogonal to the ridge direction of the frame corner portion 68, the length of the second frame wall 66 in the direction along the second case wall 36 (arrow Z1, Z2 direction) is the second contact in the same direction. It is longer than the length of the portion 46. Therefore, the space between the outer side surface 66 a of the second frame wall 66 and the inner side surface 36 a of the second case wall 36 is partially filled by the second contact portion 46.

As shown in FIG. 3, a set of connecting members 70 are provided along a set of sides of the bottom surface of the battery group 16 that are not covered with the bottom member 60, in other words, along the bottom sides of the side surfaces 16c and 16d. It is done. The connecting member 70, the bottom member 60, and the extending portion 62c are stacked in the vertical direction, and the shaft portion of the bolt 30 is inserted through the stacked portions from the upper side to the lower side. Further, as described above, the shaft portion of the bolt 30 is also inserted into the insertion holes 28 a (see FIG. 2) of the protrusions 28 provided at the four corners of the bottom surface of the bottom case 22. By attaching a nut 72 (see FIG. 3) or the like to the tip of the shaft portion, the support frame 18 and the bottom case 22 are connected via the connecting member 70.

Among the upper surfaces of the battery group 16, a set of connecting members 74 is provided along a set of sides that are not covered by the upper end portion 62b of the covering member 62, in other words, along the upper sides of the side surfaces 16c and 16d. On both end sides in the extending direction of the upper end portion 62b of the covering member 62, convex portions 76 projecting upward are provided. By providing the convex portion 76 in this manner, a space in which the head of the bolt 50 can be disposed is provided between both end sides in the extending direction of the upper end portion 62 b and the upper surface of the battery group 16.

The convex portion 76 and the connecting member 74 are stacked in the vertical direction, and the shaft portion of the bolt 50 is inserted into the stacked portion from the lower side to the upper side. In this state, the support frame 18 and the top case 26 are connected via the connecting member 74 by screwing the male screw 50a of the bolt 50 and the female screw of the top case 26 together.

The two battery core packs 14a and 14b constituting the battery group 16 are configured in substantially the same manner. For this reason, below, with the description of the battery core pack 14a, the specific description of the battery core pack 14b is omitted.

As shown in FIG. 6, the battery core pack 14 a includes a plurality of battery cells 80 and a cell holder 82. As shown in FIG. 2, in the present embodiment, the battery group 16 has a lower end side in order to form a space for accommodating wiring (not shown) between the battery group 16 and the notch of the bottom case 22. It has a quadrangular prism shape with parts cut out.

The battery cell 80 has, for example, a cylindrical shape, and is provided with a positive electrode terminal 86 and a negative electrode terminal 88 at both ends in the axial direction. Although the lithium ion secondary battery can be mentioned as a suitable kind of the battery cell 80, it is not limited to this in particular, For example, you may use secondary batteries, such as a nickel metal hydride battery and a nickel cadmium battery.

The cell holder 82 is configured by combining a positive electrode side holder 82a and a negative electrode side holder 82b, and includes a holding portion 90, a pressing plate portion 92, and a peripheral wall portion 94. The holding unit 90 has a plurality of holding holes 96 and holds the battery cells 80 in a state of being inserted through the holding holes 96. The holding hole 96 extends along the directions of arrows Z1 and Z2, and exposes the positive electrode terminal 86 or the negative electrode terminal 88 of the battery cell 80 from the openings at both ends in the extending direction. In the plurality of battery cells 80 held by the holding unit 90, the positive terminals 86 are arranged flush with each other, and the negative terminals 88 are arranged flush with each other.

The holding plate portion 92 is provided on each end of the holding portion 90 in the directions of arrows Z1 and Z2, and an exposed portion 98 made of a through hole is provided at a position corresponding to the opening of the holding hole 96. The positive electrode terminal 86 is exposed to the outside of the cell holder 82 through the opening on one end side of the holding hole 96 and the exposed portion 98 of the positive electrode side holder 82a. Further, the negative electrode terminal 88 is exposed to the outside of the cell holder 82 through the opening on the other end side of the holding hole 96 and the exposed portion 98 of the negative electrode side holder 82b.

A plurality of bus bar plates 100 (see FIGS. 2 and 3) are attached to the holding plate 92 so as to cover the exposed portion 98 that exposes the positive electrode terminal 86 and the exposed portion 98 that exposes the negative electrode terminal 88. It is done. The pressing plate portion 92 is provided with a ridge portion 102 that is interposed between the bus bar plates 100 and insulates each other.

Two battery core packs 14a and 14b are connected to form a battery group 16 so that the negative electrode terminal 88 side of one battery core pack 14a and the positive electrode terminal 86 side of the other battery core pack 14b face each other. Has been. Moreover, the positive electrode terminal 86 side of one battery core pack 14a and the negative electrode terminal 88 side of the other battery core pack 14b, in other words, the side surfaces 16a and 16b on both sides in the directions of arrows Z1 and Z2 of the battery group 16 are It faces the inner surface 32a of the case 24.

Each of the plurality of bus bar plates 100 connects a predetermined number of the positive terminals 86 or the negative terminals 88 in parallel, and protrudes into the exposed portion 98 and comes into contact with the positive terminals 86 or the negative terminals 88. The portion 104 is provided by, for example, embossing.

The peripheral wall portion 94 is provided so as to surround the holding portion 90 and the exposed portion 98. In addition, a plurality of grooves 94 a into which connection end portions 106 (see FIGS. 2 and 3) of the bus bar plate 100 are respectively inserted are provided on the end surface of the peripheral wall portion 94. By connecting the connection end portion 106 and the above lead wire or the like, the plurality of bus bar plates 100 are connected to the connector portion via the BMU 20 in a state of being connected in series.

As shown in FIG. 3, the upper end on the arrow Z1 side of the positive electrode side holder 82a of the battery core pack 14a and the upper end on the arrow Z2 side of the negative electrode side holder 82b of the battery core pack 14b protrude upward. A protruding wall 108 is provided. A BMU 20 is disposed between the protruding walls 108.

The BMU 20 stores, for example, a control unit that controls charging / discharging of the battery group 16, a communication unit that communicates with the electric vehicle and the charging device, and the state of the battery group 16 detected from the temperature and voltage of the battery cell 80. Storage unit (not shown).

In the battery pack 10 according to the present embodiment basically configured as described above, for example, the battery pack 10 is carried in the vicinity of the charging device by gripping the handle 26a, and the connector portion and the charging device are connected. Thus, the battery cell 80 can be charged. On the other hand, for example, by carrying the battery pack 10 by gripping the handle 26a and mounting the battery pack 10 on the electric vehicle so that the connector portion and the power supply port are connected, the battery cell 80 is discharged. Can do.

As described above, in the battery pack 10, the relative position between the first case wall 32 and the first frame wall 64 is fixed by the first contact portion 44 and the second contact portion 46, and the second case wall 36 is The relative position with respect to the second frame wall 66 is fixed. Accordingly, regardless of whether or not the same curvature as that of the case corner portion 40 is attached to the frame corner portion 68, the first contact portion 44 is provided between the first case wall 32 and the first frame wall 64, With a simple configuration in which the second contact portion 46 is provided between the second case wall 36 and the second frame wall 66, rattling between the case 12 and the support frame 18 can be suppressed.

That is, backlash between the case 12 and the support frame 18 can be suppressed even when the radius of the corner of the case corner portion 40 and the radius of the radius of the frame corner portion 68 are different from each other. Therefore, the durability of the battery pack 10 can be easily improved with a simple configuration without requiring a complicated process of aligning the radius of the corner of the case corner 40 and the radius of the corner of the frame corner 68. Can do.

In the battery pack 10 according to the above embodiment, the first contact portion 44 is formed integrally with the case 12 (outer shell case 24) so as to protrude from the first case wall 32 toward the first frame wall 64. The second contact portion 46 is formed integrally with the case 12 (outer shell case 24) so as to protrude from the second case wall 36 toward the second frame wall 66.

In this case, the front end surface 44 a of the first contact portion 44 protruding from the first case wall 32 contacts the outer surface 64 a of the first frame wall 64, and the second contact portion 46 protrudes from the second case wall 36. The front end surface 46 a contacts the outer side surface 66 a of the second frame wall 66. Thereby, the play between the case 12 and the support frame 18 can be suppressed. Thus, the durability of the battery pack 10 can be easily improved by a simple configuration in which the first contact portion 44 and the second contact portion 46 are provided in the case 12.

As shown in FIG. 7, the battery pack 10 has a first contact formed integrally with the support frame 18 instead of the first contact portion 44 and the second contact portion 46 formed integrally with the case 12. The portion 110 and the second contact portion 112 may be provided. In this case, the first contact portion 110 is formed integrally with the side portion 62 a of the support frame 18 so as to protrude from the first frame wall 64 toward the first case wall 32. The second contact portion 112 is formed integrally with the side portion 62 a of the support frame 18 so as to protrude from the second frame wall 66 toward the second case wall 36.

The protruding length of the first contact portion 110 with respect to the outer side surface 64 a of the first frame wall 64 is smaller than the thickness of the first case wall 32. The protruding length of the second contact portion 112 with respect to the outer side surface 66 a of the second frame wall 66 is smaller than the thickness of the second case wall 36. In addition, the protrusion length of the 1st contact part 110 and the protrusion length of the 2nd contact part 112 may mutually be the same, and may differ. Further, the front end surface 110 a of the first contact portion 110 is a flat surface along the inner side surface 32 a of the first case wall 32, and the front end surface 112 a of the second contact portion 112 is the inner side surface of the second case wall 36. It is a flat surface along 36a.

In the cross section of the side portion 62a orthogonal to the ridge direction of the frame corner portion 68, the length of the first frame wall 64 in the direction along the first case wall 32 (arrow Y1, Y2 direction) is the first contact in the same direction. It is longer than the length of the part 110. Further, the length of the second frame wall 66 in the direction along the second case wall 36 (the direction of the arrows Z1 and Z2) is longer than the length of the second contact portion 112 in the same direction.

For this reason, the front end surface 110a of the first contact portion 110 protruding from the first frame wall 64 abuts on the inner side surface 32a of the first case wall 32, so that the first contact portion 110 makes the first frame wall. The space between the outer surface 64 a of 64 and the inner surface 32 a of the first case wall 32 is partially filled. Similarly, the front end surface 112a of the second contact portion 112 protruding from the second frame wall 66 abuts on the inner side surface 36a of the second case wall 36, so that the second frame wall is caused by the second contact portion 112. The space between the outer side surface 66a of 66 and the inner side surface 36a of the second case wall 36 is partially filled. Also in this case, the durability of the battery pack 10 can be easily improved by a simple configuration in which the first contact portion 110 and the second contact portion 112 are provided on the support frame 18.

In the battery pack 10 according to the above embodiment, each of the

first contact portions

44 and 110 and the

second contact portions

46 and 112 is a ridge extending along the ridge direction of the case corner portion 40. It was. In this case, the backlash between the case 12 and the support frame 18 can be effectively suppressed with a simple configuration, and the durability of the battery pack 10 can be improved. In addition, each shape of the

1st contact parts

44 and 110 and the

2nd contact parts

46 and 112 is not limited to said protrusion.

In the above embodiment, the first contact portion 44 and the second contact portion 46 extend from one end to the other end in the ridge direction of the outer shell case 24. That is, both end surfaces in the extending direction of the first contact portion 44 and both end surfaces in the ridge direction of the outer shell case 24 are flush with each other, and both end surfaces in the extending direction of the second contact portion 46 are in contact with the outer shell. The both ends of the case 24 in the ridge direction are flush with each other.

In this case, when the support frame 18 integrated with the battery group 16 is inserted into the outer shell case 24 along the ridge direction, the lower end surface of the support frame 18, the first contact portion 44, and the second contact portion. It can suppress that the part 46 interferes. As a result, the battery pack 10 can be easily assembled. In addition, the contact area between the first contact portion 44 and the first frame wall 64 in the extending direction of the first contact portion 44 and the second contact portion 46 can be increased, and the second contact portion 46. And the contact area between the second frame wall 66 and the second frame wall 66 can be increased. Thereby, it is possible to more effectively suppress the backlash between the case 12 and the support frame 18.

The extending lengths of the first contact portion 44 and the second contact portion 46 are not particularly limited to the above length, and may be shorter than the length of the outer shell case 24 in the ridge direction. . The

first contact portions

44 and 110 and the

second contact portions

46 and 112 may be provided intermittently in the ridge direction.

In the above embodiment, the front end surface 44 a of the first contact portion 44 and the front end surface 46 a of the second contact portion 46 are respectively connected to the outer surface 64 a of the first frame wall 64 and the outer surface 66 a of the second frame wall 66. It was set as the flat surface along a surface direction. Thereby, the contact area between the first contact part 44 and the first frame wall 64 can be increased, and the contact area between the second contact part 46 and the second frame wall 66 can be increased. As a result, it is possible to more effectively suppress backlash between the case 12 and the support frame 18.

Further, each of the front end surface 110a of the first contact portion 110 and the front end surface 112a of the second contact portion 112 is a flat surface along the inner side surface 32a of the first case wall 32 and the inner side surface 36a of the second case wall 36. did. Thereby, the contact area between the first contact part 110 and the first case wall 32 can be increased, and the contact area between the second contact part 112 and the second case wall 36 can be increased. As a result, it is possible to more effectively suppress backlash between the case 12 and the support frame 18.

However, for example, the front end surface 44a of the first contact portion 44 may be a curved surface so that the outer surface 64a of the first frame wall 64 and the front end surface 44a of the first contact portion 44 are in line contact with each other. A ridge may be provided on the surface 44a. Similarly, the front end surface 46a of the second contact portion 46 and the outer surface 66a of the second frame wall 66, the front end surface 110a of the first contact portion 110, the inner side surface 32a of the first case wall 32, and the second contact. The distal end surface 112a of the portion 112 and the inner side surface 36a of the second case wall 36 may be in line contact with each other.

In the battery pack 10 according to the above embodiment, the battery core packs 14a and 14b (battery group 16) have a prismatic shape, and the frame corner portion 68 has

side surfaces

16a, 16b, 16c, and 16d of the battery core packs 14a and 14b. The case 12 has a rectangular cylindrical outer shell case 24 that covers the side surfaces 16a, 16b, 16c, 16d of the battery core packs 14a, 14b. The outer shell case 24 is a first case wall 32. The second case wall 36 and the case corner portion 40 are included.

More specifically, in the battery pack 10, the battery core packs 14a and 14b have a quadrangular prism shape, and the frame corner portion 68 is provided so as to cover the four corner ridges of the battery core packs 14a and 14b, respectively. The contact portion 44 and the second contact portion 46 are disposed in the vicinity of the case corner portion 40 provided at the four corners of the rectangular cylindrical outer shell case 24. In this case, backlash between the case 12 and the support frame 18 can be more effectively suppressed with a simple configuration.

The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, the length of the first frame wall 64 in the directions of the arrows Y1 and Y2 is longer than the length of the

first contact portions

44 and 110 in the same direction. By 110, the space between the outer side surface 64 a of the first frame wall 64 and the inner side surface 32 a of the first case wall 32 is partially filled. However, it is not particularly limited to this, and the lengths of the

first contact portions

44, 110 in the directions of the arrows Y1, Y2 are equal to or longer than the length of the first frame wall 64 in the same direction. The entire portion between the outer side surface 64a of the first frame wall 64 and the inner side surface 32a of the first case wall 32 may be filled with the

contact portions

44 and 110. Similarly, the entire portion between the outer side surface 66a of the second frame wall 66 and the inner side surface 36a of the second case wall 36 may be filled with the

second contact portions

46 and 112.

In the above embodiment, the first contact portion 44 protrudes from the inner side surface 32 a of the first case wall 32, and the second contact portion 46 protrudes from the inner side surface 36 a of the second case wall 36. However, one of the first contact portion 44 and the second contact portion 46 may not protrude from the inner side surface 32a or the inner side surface 36a. That is, a part of the inner side surface 32 a that contacts the outer side surface 64 a of the first frame wall 64 may constitute the first contact portion 44. Alternatively, a part of the inner side surface 36 a that contacts the outer side surface 66 a of the second frame wall 66 may constitute the second contact portion 46.

Similarly, one of the first contact portion 110 and the second contact portion 112 may not protrude from the outer surface 64a of the first frame wall 64 or the outer surface 66a of the second frame wall 66. That is, a part of the outer surface 64 a that contacts the inner surface 32 a of the first case wall 32 may constitute the first contact portion 110. Alternatively, a part of the outer surface 66 a that contacts the inner surface 36 a of the second case wall 36 may constitute the second contact portion 112.

Further, the

first contact portions

44 and 110 and the

second contact portions

46 and 112 may be formed of members that are separate from the case 12 and the support frame 18. Each of the

first contact portions

44 and 110 and the

second contact portions

46 and 112 is provided between the inner surface of the bottom case 22 and the top case 26 and the outer surface of the support frame 18 instead of the outer shell case 24. May be provided. The battery core packs 14a and 14b may have a prismatic shape other than the quadrangular prism shape. The battery pack 10 may include only one battery core pack, or may include a battery group in which three or more battery core packs are connected.

DESCRIPTION OF SYMBOLS 10 ... Battery pack 12 ...

Case

14a, 14b ... Battery core pack 18 ... Support frame 24 ... Outer shell case 32 ...

1st case wall

32a, 36a, 40a ... Inner side surface 36 ... 2nd case wall 40 ... Case corner part 44, DESCRIPTION OF SYMBOLS 110 ...

1st contact part

46, 112 ... 2nd contact part 64 ...

1st frame wall

64a, 66a, 68a ... Outer surface 66 ... 2nd frame wall 68 ... Frame corner part 80 ... Battery cell 82 ... Cell holder

Claims

A battery pack (10) comprising: a battery core pack (14a, 14b) having a plurality of battery cells (80) held by a cell holder (82); and a case (12) for housing the battery core pack. ,
A support frame (18) for supporting the battery core pack inside the case;
The case includes a first case wall (32), a second case wall (36), a case corner portion (40) formed at a ridge portion of the first case wall and the second case wall and curved. Have
The support frame includes a first frame wall (64), a second frame wall (66), and a frame corner portion (68) formed at a ridge portion of the first frame wall and the second frame wall. Have
The inner side surface (40a) of the case corner portion faces the outer side surface (68a) of the frame corner portion,
A first abutting portion (44) is provided to at least partially fill a gap between an inner side surface (32a) of the first case wall and an outer side surface (64a) of the first frame wall facing each other inside the case. ,
A second contact portion (46) is provided that at least partially fills the space between the inner side surface (36a) of the second case wall and the outer side surface (66a) of the second frame wall, which are opposed to each other inside the case. , Battery pack.
The battery pack according to claim 1,
The first contact portion is formed integrally with the case so as to protrude from the first case wall toward the first frame wall;
The battery pack, wherein the second contact portion is formed integrally with the case so as to protrude from the second case wall toward the second frame wall.
The battery pack according to claim 1,
The first contact portion is formed integrally with the support frame so as to protrude from the first frame wall toward the first case wall,
The battery pack, wherein the second contact portion is formed integrally with the support frame so as to protrude from the second frame wall toward the second case wall.
In the battery pack according to claim 2 or 3,
Each of said 1st contact part and said 2nd contact part is a battery pack which is a protrusion extended along the ridge direction of the said case corner part.
The battery pack according to any one of claims 1 to 4,
The battery core pack has a prismatic shape,
The frame corner portion covers the ridges between the side surfaces (16a, 16b, 16c, 16d) of the battery core pack,
The case includes a rectangular tube-shaped outer shell case (24) that covers a side surface of the battery core pack, and the outer shell case includes the first case wall, the second case wall, and the case corner portion. And having a battery pack.
The battery pack according to claim 5,
The battery core pack has a quadrangular prism shape,
The frame corner portion is provided so as to cover ridges at the four corners of the battery core pack,
The battery pack, wherein the first contact portion and the second contact portion are respectively disposed in the vicinity of the case corner portion provided at the four corners of the outer shell case having a rectangular tube shape.