WO2019221223A1

WO2019221223A1 - Battery pack

Info

Publication number: WO2019221223A1
Application number: PCT/JP2019/019485
Authority: WO
Inventors: 松元隆志
Original assignee: 本田技研工業株式会社
Priority date: 2018-05-17
Filing date: 2019-05-16
Publication date: 2019-11-21
Also published as: JPWO2019221223A1

Abstract

A battery pack (10), provided with: a battery core pack (14) having a plurality of cells (80) held by a cell holder (82); a case (12) housing the battery core pack (14); and a support frame (18) for supporting the battery core pack (14) in the case (12). The case (12) has: an outer shell case (26) provided with an upper opening (26a); and a top case (28) covering the upper opening (26a). The support frame (18) has a first frame (56) and a second frame (58). The first frame (56) and the second frame (58) is connected to a reinforcing member (20) integrated with the top case (28).

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.

The case has a rectangular tube-shaped outer shell case that covers the side surface of the battery core pack, a bottom case that covers an opening on the bottom surface side of the outer shell case, and a top case that covers an opening on the upper surface side of the outer shell case. . The top case may be provided with a handle that can be gripped when the user carries the battery pack.

This type of battery pack is required to improve durability by suppressing rattling of the battery core pack in the case. Thus, it is conceivable to provide a support frame that supports the battery core pack inside the case and is connected to the top case.

In this case, the support frame is preferably high in strength and rigidity so as to have excellent durability. Moreover, it is preferable that the battery pack provided with the structure where the support frame is connected to the top case is lightweight and excellent in assemblability.

Therefore, an object of the present invention is to provide a battery pack that is lightweight and has excellent assemblability and durability.

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. The case further includes an outer shell case provided with an opening, and a top case covering the opening, and the support frame includes a plurality of frame members, The plurality of frame members are coupled to a reinforcing member integrated with the top case.

In the battery pack of the present invention, the reinforcement members are connected to the plurality of frame members of the support frame, so that the plurality of frame members constitute a frame structure together with the reinforcement members. Thereby, the rigidity of a support frame can be improved. Further, by integrating the reinforcing member with the top case, the strength and rigidity of the reinforcing member can be increased. In this case, for example, unlike a reinforcing member that has increased strength and rigidity by providing ribs on the side edges or by increasing the thickness, the weight of the reinforcing member increases or the assembling property of the reinforcing member decreases. Can be avoided. Accordingly, it is possible to increase the rigidity of the support frame while suppressing the increase in the weight of the battery pack and the ease of assembly, and to effectively suppress the backlash and the like of the battery core pack in the case. Become. That is, this battery pack is lightweight and excellent in assemblability and durability.

Also, in this battery pack, the integrated top case and reinforcing member can be handled as a sub-assembly. Further, by using the top case, the strength and rigidity of the reinforcing member can be increased without adding new components. These also make it possible to effectively reduce the weight of the battery pack and improve the assemblability.

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 a bottom case, an outer shell case, and a top case to which a support frame and a handle are connected via a reinforcing member. It is a disassembled perspective view of a support frame, a battery core pack, a top case, a reinforcing member, a handle, and a top cover. It is a perspective view of the top case integrated with the reinforcing member. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is a disassembled perspective view of a battery core pack.

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 to this, 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 that forms an exterior, a battery group 16 that connects two

battery core packs

14 a and 14 b, and a support frame 18 that supports the

battery core packs

14 a and 14 b. The reinforcing member 20 connected to the support frame 18, a battery management device (BMU) 22, and a connector unit (not shown) are mainly provided.

Case 12 accommodates

battery core packs

14a and 14b. The case 12 can be formed from, for example, a metal such as aluminum, a resin (including a fiber reinforced resin), or the like. The case 12 includes a bottom case 24, an outer shell case 26, a top case 28, and a top cover 30.

The bottom case 24 is a housing having an open upper end. For example, hollow cylindrical or truncated cone-shaped protrusions 32 that protrude toward the upper side (arrow X1 side) are provided at the four corners of the bottom surface. ing. An insertion hole 32a through which a shaft portion of a bolt 68 (see FIG. 3), which will be described later, is inserted is formed on the distal end surface of the protruding portion 32. In addition, the connector portion and the like described above are accommodated in the bottom case 24.

The connector portion is exposed to the outside of the case 12 through, for example, a notch formed in the bottom wall of the bottom case 24, and is 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 part 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 22 by a lead wire (not shown) or the like.

The outer shell case 26 has a rectangular tube shape and covers the side surface of the battery group 16. An upper opening 26 a (opening) is provided at the upper end of the outer shell case 26, and a lower opening 26 b is provided at the lower end of the outer shell case 26. The bottom case 24, the outer shell case 26 and the top case 28 are integrated with the lower opening 26b covered with the bottom case 24 and the upper opening 26a covered with the top case 28. The battery group 16, the support frame 18, the BMU 22, and the like are accommodated in the internal space of the case 12 formed thereby.

The top case 28 has a plate shape corresponding to the dimension of the upper opening 26a. The top case 28 has a rectangular shape in plan view (viewed from the directions of the arrows X1 and X2). Specifically, as shown in FIGS. 2 to 5, the upper surface 28a (outer surface) of the top case 28 is arranged on both ends in the directions of arrows Y1 and Y2 along one side of the rectangular shape, and in the directions of arrows Y1 and Y2. A pair of groove portions 36 extending along the directions of the arrows Z1 and Z2 orthogonal to each other are provided. A rectangular plate-shaped reinforcing member 20 made of metal or the like is accommodated in each of the groove portions 36. The two reinforcing members 20 are arranged in parallel to each other. The reinforcing member 20 is disposed so as to overlap the top case 28 so that the thickness directions of the reinforcing member 20 and the top case 28 coincide. The top case 28 is sandwiched between the support frame 18 and the reinforcing member 20. In the present embodiment, the length in the extending direction of the groove portion 36 and the length in the arrow Z1 and Z2 directions of the top case 28 are the same, but the present invention is not particularly limited thereto.

As shown in FIG. 5, a pair of locking portions 38 that sandwich the reinforcing member 20 between the bottom portions 36 a of the groove portions 36 are provided at both ends in the width direction (arrow Y 1, Y 2 direction) of each groove portion 36. Each is provided. As shown in FIGS. 4 and 5, the set of locking portions 38 protrudes from both end edges in the width direction of the groove portion 36 toward the center side in the width direction, and extends in the extending direction of the groove portion 36. It is a ridge extending along. The opposing surfaces of the pair of locking portions 38 are inclined guide surfaces 38a that are inclined in directions away from each other from the lower end toward the upper end. In other words, the inclined guide surface 38 a is inclined so as to approach the bottom 36 a of the groove 36 toward the center in the width direction of the groove 36. The reinforcing member 20 is disposed between the lower end surface 38 b of the locking portion 38 and the bottom portion 36 a of the groove portion 36.

Through holes 40 (see FIGS. 3 and 4) are formed in the reinforcing member 20 and the top case 28, respectively. Specifically, through holes 40 are formed at four corners of the top case 28. Moreover, the through-hole 40 is formed in the both ends of the longitudinal direction (arrow Z1, Z2 direction) of each reinforcement member 20. As shown in FIG.

2 and 3, a handle 42 is connected to the upper surface 28a side of the top case 28 via a reinforcing member 20. The handle 42 is gripped by the user when the battery pack 10 is carried, for example. The handle 42 includes a set of mounting plate portions 44 stacked on the set of reinforcing members 20, a set of leg portions 46 respectively erected on the set of mounting plate portions 44, and a set of And a gripping portion 48 spanned between the leg portions 46.

Each mounting plate portion 44 has a rectangular plate shape with a size corresponding to the size of the reinforcing member 20. The set of attachment plate portions 44 extend in parallel to each other. As shown in FIG. 3, through holes 44 a that overlap the through holes 40 of the reinforcing member 20 and the top case 28 are also provided at both ends in the extending direction of the mounting plate portions 44. The leg portion 46 protrudes upward from the approximate center in the extending direction of each mounting plate portion 44. A grip 48 is provided between the upper ends of the pair of legs 46.

As shown in FIG. 2, the top cover 30 is attached to the top of the top case 28 or the outer shell case 26, and exposes the upper side of the leg part 46 and the grip part 48, and is attached to the lower end side of the leg part 46. The plate portion 44, the reinforcing member 20, and the upper surface 28a and the side surface 28b of the top case 28 are covered. As shown in FIGS. 2 and 3, the top cover 30 is configured by combining a pair of divided

members

30a and 30b, for example, and extends substantially in the center in the directions of arrows Z1 and Z2 in the directions of arrows Y1 and Y2. Dividing is possible by a dividing line L (see FIG. 2). A pair of cutouts 50 into which the leg portions 46 of the handle 42 can be inserted are formed at the ends of the dividing

members

30a and 30b on the dividing line L side.

On the upper surface 28a of the top case 28, one split member 30a is slid from the arrow Z1 side to the arrow Z2 side, and the other split member 30b is slid from the arrow Z2 side to the arrow Z1 side. Thus, the leg part 46 is inserted in each notch 50 by making the edge part by the side of the dividing line L of a set of

division member

30a, 30b mutually contact | abut. As a result, as described above, the top cover 30 is mounted so as to cover the remaining portion of the handle 42 and the reinforcing member 20 and the top case 28 integrated with each other while exposing the upper side of the leg portion 46 and the grip portion 48. can do.

The support frame 18 is connected to the lower surface 28c (inner surface) side of the top case 28. The support frame 18 is made of, for example, metal and supports the battery group 16 inside the case 12. The support frame 18 includes a plurality of frame members (a first frame 56 and a second frame 58). Specifically, the support frame 18 is a pair of side surfaces 52 and 54 (see FIG. 3) facing each other of the substantially rectangular parallelepiped battery group 16 as described later, and a ridge line on the side surface 52 side and the vicinity thereof. And a second frame 58 covering a ridge line on the other side surface 54 side and a surface in the vicinity thereof.

Each of the first frame 56 and the second frame 58 includes a portion having a substantially L-shaped cross section orthogonal to the extending direction, and is configured by connecting the bottom member 60 and the covering member 62. The bottom member 60 of the first frame 56 extends along the bottom side of the side surface 52 of the battery group 16. The covering member 62 of the first frame 56 includes a pair of side portions 62a extending along a set 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 52 of the battery group 16. 62b. In addition, an extended 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 52 of the battery group 16.

The bottom member 60 of the second frame 58 extends along the bottom side of the side surface 54 of the battery group 16. The covering member 62 of the second frame 58 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 54 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 54 of the battery group 16.

A set of connecting members 66 is provided along a set of sides that are not covered by the bottom member 60 in the bottom surface of the battery group 16. The connecting member 66, the bottom member 60, and the extending portion 62c of the covering member 62 are stacked in the vertical direction, and the shaft portion of the bolt 68 is inserted through the stacked portions from the upper side to the lower side. Moreover, the axial part of the volt | bolt 68 is penetrated by the insertion hole 32a (refer FIG. 2) of the projection part 32 provided in the four corners of the bottom face of the bottom case 24 as above-mentioned. By attaching a nut 69 (see FIG. 3) or the like to the tip of this shaft portion, the support frame 18 and the bottom case 24 are connected via a connecting member 66.

The support frame is arranged so that the reinforcing member 20 follows the pair of

sides

70 a and 70 b (see FIG. 3) of the upper surface 70 of the battery group 16 not covered by the upper end portion 62 b of the covering member 62 via the top case 28. The positional relationship between 18 and the reinforcing member 20 is set. On both end sides in the extending direction of the upper end portion 62b of the covering member 62, a convex portion 72 protruding upward and a through hole 74 overlapping the above through

holes

40 and 44a are provided. By providing the convex portion 72 in this manner, a space in which the head of the bolt 34 (insertion member) can be disposed between both end sides in the extending direction of the upper end portion 62 b and the upper surface 70 of the battery group 16. Is provided.

Further, the shaft portion of the bolt 34 is inserted into the through-

holes

74, 40, and 44a overlapped with each other from the lower side to the upper side, and a nut 75 (see FIG. 2) is provided at the tip of the shaft portion. As a result, the support frame 18, the top case 28 and the reinforcing member 20, and the mounting plate portion 44 of the handle 42 are connected by the connecting mechanism 76 including the bolt 34, the nut 75, and the like.

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. In addition, when these two battery core packs 14a and 14b are not distinguished from each other, they are also collectively referred to as a battery core pack 14.

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 (battery core pack 14) is formed so as to form a space for accommodating a wiring or the like (not shown) between the battery group 16 and the cutout of the bottom case 24. A rectangular parallelepiped shape in which a part of the lower end side is 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 the 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 respective positive terminals 86 are arranged flush with each other, and the respective negative terminals 88 are arranged flush with each other. Further, a potting material (not shown) made of an insulating resin or the like may be filled between the peripheral surfaces of the plurality of battery cells 80 held by the holding unit 90.

The pressing 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. Hereinafter, the positive electrode terminal 86 and the negative electrode terminal 88 are collectively referred to as an electrode terminal.

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.

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 52 and 54 on both sides of the battery group 16 in the directions of arrows Z1 and Z2, are the outer shell case 26. Facing the inner side of the.

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 the protruding portion 104 that enters the exposed portion 98 and contacts the electrode terminal includes, for example, It is provided by embossing or the like.

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 connecting 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 22 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 22 is disposed between the protruding walls 108.

The BMU 22 includes, for example, a control unit that controls charging / discharging of the battery core pack 14, a communication unit that communicates with the electric vehicle and the charging device, and the state of the battery core pack 14 detected from the temperature and voltage of the battery cell 80. (Not shown).

Basically, in the battery pack 10 according to the present embodiment configured as described above, for example, the handle 42 is held and the battery pack 10 is carried in the vicinity of the charging device, 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 holding the handle 42 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 this battery pack 10, the reinforcing member 20 is connected to the first frame 56 and the second frame 58 of the support frame 18, so that the first frame 56 and the second frame 58 have a frame structure together with the reinforcing member 20. Constitute. Thereby, the rigidity of the support frame 18 can be increased. Further, by integrating the reinforcing member 20 with the top case 28, the strength and rigidity of the reinforcing member 20 can be increased. In this case, for example, unlike a reinforcing member (not shown) in which ribs are provided on the side edges or the thickness is increased to increase strength and rigidity, the weight of the reinforcing member 20 increases, It is possible to avoid a decrease in assembling ability.

Therefore, the rigidity of the support frame 18 is enhanced while suppressing the increase in the weight of the battery pack 10 and the ease of assembly, and the rattling of the battery core pack 14 in the case 12 is effectively suppressed. It becomes possible. That is, the battery pack 10 is lightweight and excellent in assemblability and durability.

Further, in the battery pack 10, the integrated top case 28 and the reinforcing member 20 can be handled as subassemblies. Furthermore, the strength and rigidity of the reinforcing member 20 can be increased by integration with the top case 28 for closing the upper opening 26 a of the outer shell case 26. That is, an additional component for increasing the strength and rigidity of the reinforcing member 20 can be eliminated. These also make it possible to effectively reduce the weight of the battery pack 10 and improve the assemblability.

As described above, in the present embodiment, the reinforcing member 20 has a plate shape. With such a simple configuration, the weight of the reinforcing member 20 can be further reduced, and the reinforcing member 20 can be easily manufactured. The reinforcing member 20 is not limited to a plate shape, can be integrated with the top case 28, and is interposed between the top case 28 and the support frame 18 so as to be integrated with the top case 28 and the support frame 18. Any shape can be used as long as the connection strength can be increased.

As described above, in the present embodiment, the top case 28 has a plate shape formed along the shape of the opening (upper opening 26 a), and the reinforcing member 20 has a thickness between the reinforcing member 20 and the top case 28. The top case 28 is arranged so as to overlap the vertical direction. Thereby, the thickness of the integrated top case 28 and the reinforcing member 20 can be reduced.

As described above, in the present embodiment, the top case 28 sandwiches the reinforcing member 20 between the groove portion 36 that houses the reinforcing member 20 and the bottom portion 36 a of the groove portion 36 that is provided at the edge in the width direction of the groove portion 36. It has decided to have the latching | locking part 38 to be. In this case, the top case 28 and the reinforcing member 20 can be easily integrated with a simple configuration.

In the present embodiment, the locking portion 38 is a protrusion that protrudes from the edge in the width direction of the groove portion 36 toward the center in the width direction and extends along the extending direction of the groove portion 36. It was supposed to be. As a result, the top case 28 and the reinforcing member 20 can be more reliably integrated. Moreover, since the latching | locking part 38 which is a protrusion plays the role similar to the rib provided in the side edge of the reinforcement member 20, it becomes possible to raise the intensity | strength and rigidity of the reinforcement member 20 more effectively.

In addition, the structure which integrates the top case 28 and the reinforcement member 20 is not limited to said groove part 36 or the latching | locking part 38. FIG. Further, the locking portion 38 may be one or a plurality of protruding claws instead of the protrusions.

Further, in the present embodiment, the locking portion 38 protrudes from the edge on both sides in the width direction of the groove portion 36 toward the center side in the width direction and extends along the extending direction of the groove portion 36. It was decided that Thus, the top case 28 and the reinforcing member 20 can be integrated more firmly by making the engaging portions 38 a pair.

As described above, in the present embodiment, the locking portion 38 has the inclined guide surface 38 a that approaches the bottom portion 36 a of the groove portion 36 toward the center side in the width direction of the groove portion 36. This facilitates the insertion of the reinforcing member 20 into the groove 36, and can further improve the assembling property of the battery pack 10. In addition, by providing the inclined guide surface 38a, it is easy to insert the attachment plate portion 44 into the groove portion 36 when the attachment plate portion 44 of the handle 42 is laminated on the reinforcing member 20. When the reinforcing member 20 is inserted into the groove portion 36, the reinforcing member 20 may be slid along the extending direction from one end portion in the extending direction of the groove portion 36, or the groove portion from above the groove portion 36. The reinforcing member 20 may be fitted into the interior of 36.

As described above, in the present embodiment, the top case 28 is sandwiched between the support frame 18 and the reinforcing member 20. Thereby, the top case 28 and the reinforcing member 20 can be firmly integrated. Further, it is possible to facilitate the positioning of the attachment plate portion 44 of the handle 42 and the reinforcing member 20 and improve the assembling property of the battery pack 10.

As described above, in the battery pack 10 according to the present embodiment, the top case 28 has an inner surface (lower surface 28 c) facing the support frame 18 and an outer surface (upper surface 28 a) to which a handle 42 held by the user is attached. It was. The reinforcing member 20 was in the form of a set of rectangular plates that are spaced from each other with respect to the outer surface of the top case 28. The handle 42 includes a set of mounting plate portions 44 stacked on the set of reinforcing members 20, a set of leg portions 46 respectively standing on the set of mounting plate portions 44, and a set of leg portions. And a gripping portion 48 spanned between 46. The reinforcing member 20 integrated with the top case 28, the support frame 18, and the attachment plate portion 44 are connected to each other by a connecting mechanism 76 having insertion members (bolts 34) inserted along the stacking direction. It was decided to be connected.

In this battery pack 10, for example, when the user holds the handle 42 and lifts the battery pack 10, the reinforcing member 20 interposed between the handle 42 and the support frame 18 corresponds to the weight of the battery group 16. Reaction force is generated. Even if such a reaction force occurs, as described above, the strength and rigidity of the reinforcing member 20 are increased, so that the handle 42 and the support frame 18 are well connected via the reinforcing member 20. can do. That is, the durability of the battery pack 10 can be effectively improved.

The reinforcing member 20 may be attached to the lower surface 28c instead of the upper surface 28a of the top case 28. Further, the reinforcing member 20 is not limited to two rectangular plates, and may be one or three or more. Further, the connecting mechanism 76 is not limited to the one having the bolt 34 and the nut 75, and may be any mechanism as long as the top case 28 and the support frame 18 can be connected via the reinforcing member 20.

As described above, in this embodiment, the case 12 has the top cover 30. The top cover 30 exposes the grip portion 48 and covers at least a part of the set of attachment plate portions 44, the set of reinforcing members 20, and the top case 28. In this case, it is possible to improve the appearance design of the battery pack 10 while maintaining the functionality of connecting the support frame 18, the top case 28, and the handle 42 to improve the durability of the battery pack 10. Become. Note that the case 12 may not have the top cover 30.

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, the battery pack 10 according to the above embodiment includes the battery group 16 in which two battery core packs 14a and 14b are connected. However, the battery pack 10 may include only one battery core pack 14 or may include a battery group (not shown) in which three or more battery core packs 14 are connected.

In the above embodiment, the support frame 18 includes the first frame 56 and the second frame 58, but the present invention is not particularly limited thereto. The support frame 18 may be configured to be able to support the battery group 16 (battery core pack 14) inside the case 12. Further, the structure for connecting the support frame 18 to the bottom case 24 is not limited to the bolt 68 and the nut 69 described above.

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

Case

14, 14a, 14b ... Battery core pack 18 ... Support frame 20 ... Reinforcement member 26 ... Outer shell case 26a ... Upper opening 28 ... Top case 30 ... Top cover 34 ... Bolt (insertion member)
36 ... Groove 36a ... Bottom 38 ... Locking part 42 ... Handle 44 ... Mounting plate part 46 ... Leg 48 ... Holding part 76 ... Connection mechanism 80 ... Battery cell 82 ... Cell holder

Claims

A battery pack (10) comprising a battery core pack (14) 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 has an outer case (26) provided with an opening (26a), and a top case (28) covering the opening,
The support frame has a plurality of frame members (56, 58);
The battery pack, wherein the plurality of frame members are coupled to a reinforcing member (20) integrated with the top case.
The battery pack according to claim 1,
The battery pack is a reinforcing member having a plate shape.
The battery pack according to claim 2,
The top case is a plate formed along the shape of the opening,
The battery pack, wherein the reinforcing member is disposed so as to overlap the top case so that thickness directions of the reinforcing member and the top case match.
The battery pack according to any one of claims 1 to 3,
The top case is provided with an engaging portion (36) between the groove (36) for accommodating the reinforcing member and an edge in the width direction of the groove and sandwiching the reinforcing member between the bottom (36a) of the groove. 38).
The battery pack according to claim 4,
The said latching | locking part is a battery pack which is a protrusion which protrudes toward the center side of this width direction from the edge part of the width direction of the said groove part, and extends along the extending direction of the said groove part.
The battery pack according to claim 4,
The locking portion is a battery that is a pair of ridges that protrude from both side edges in the width direction of the groove portion toward the center in the width direction and extend in the extending direction of the groove portion. pack.
The battery pack according to claim 5 or 6,
The said latching | locking part is a battery pack which has an inclination guide surface (38a) which approaches the bottom part of the said groove part toward the center side of the said width direction of the said groove part.
The battery pack according to any one of claims 1 to 7,
The top case is a battery pack that is sandwiched between the support frame and the reinforcing member.
The battery pack according to any one of claims 1 to 8,
The top case has an inner surface (28c) facing the support frame and an outer surface (28a) to which a handle (42) gripped by a user is attached.
The reinforcing member is a set of rectangular plates that are spaced apart from each other with respect to the outer surface of the top case,
The handle includes a set of attachment plate portions (44) stacked on the set of reinforcing members, a set of leg portions (46) respectively erected on the set of attachment plate portions, A grip (48) spanned between a pair of legs,
The connecting mechanism (76) having an insertion member (34) through which the reinforcing member integrated with the top case, the support frame, and the mounting plate portion are inserted into each other in the lamination direction. Connected by a battery pack.
The battery pack according to claim 9, wherein
The case has a top cover (30),
The top cover is a battery pack that exposes the grip portion and covers at least a part of the set of attachment plate portions, the set of reinforcing members, and the top case.