JP7480036B2 - Battery pack - Google Patents

Description

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

For example, as described in JP2016-534518A, a battery pack that can be detachably mounted on an electric vehicle or the like is known that includes a battery core pack having a plurality of battery cells held in a cell holder, and a case that houses the battery core pack.

The case has a rectangular cylindrical outer shell case that covers the side of the battery core pack, a bottom case that covers the opening on the bottom side of the outer shell case, and a top case that covers the opening on the top side of the outer shell case. The top case may also be provided with a handle that a user can grip when carrying the battery pack.

In this type of battery pack, it is necessary to suppress rattling of the battery core pack inside the case and improve durability, etc. Therefore, it is considered to provide a support frame that supports the battery core pack inside the case and is connected to the top case.

In this case, it is preferable that the support frame has high strength and rigidity so as to have excellent durability. In addition, it is preferable that the battery pack having a structure in which the support frame is connected to the top case is lightweight and easy to assemble.

Therefore, the present invention aims to provide a battery pack that is lightweight, easy to assemble, and durable.

One aspect of the present invention is a battery pack comprising a battery core pack having a plurality of battery cells held in cell holders and a case housing the battery core pack, further comprising a support frame supporting the battery core pack inside the case, the case having an outer shell case with an opening and a top case covering the opening, the support frame having a plurality of frame members connected to a reinforcing member integrated with the top case.

In the battery pack of the present invention, the reinforcing member is connected to multiple frame members of the support frame, so that the multiple frame members and the reinforcing member form a frame structure. This increases the rigidity of the support frame. In addition, by integrating the reinforcing member with the top case, the strength and rigidity of the reinforcing member can be increased. In this case, unlike a reinforcing member whose strength and rigidity are increased by providing a rib on the side edge or by thickening, for example, it is possible to avoid an increase in the weight of the reinforcing member and a decrease in the ease of assembly of the reinforcing member. Therefore, it is possible to effectively suppress rattling of the battery core pack in the case by increasing the rigidity of the support frame while suppressing an increase in the weight of the battery pack and a decrease in the ease of assembly. In other words, this battery pack is lightweight and has excellent assembly and durability.

In addition, with this battery pack, the integrated top case and reinforcing member can be handled as a sub-assembly. Furthermore, by using the top case, the strength and rigidity of the reinforcing member can be increased without adding any new components. These also effectively reduce the weight of the battery pack and improve its ease of assembly.

1 is a schematic perspective view of a battery pack according to an embodiment of the present invention; 2 is an exploded 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. FIG. 2 is an exploded perspective view of a support frame, a battery core pack, a top case, a reinforcing member, a handle, and a top cover. FIG. FIG. 2 is a perspective view of a top case integrated with a reinforcing member. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 2 is an exploded perspective view of the battery core pack.

A preferred embodiment 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 designated by the same reference numerals, and repeated explanations may be omitted.

The battery pack 10 shown in Figure 1 can be suitably applied to a portable driving power source that is detachably mounted on an electric vehicle (not shown), such as an electrically assisted bicycle, an electric motorcycle, or an electric car. Therefore, an example in which the battery pack 10 is mounted on an electric vehicle will be described below. The up-down direction of the battery pack 10 is based on the vertical direction (the direction of the arrows X1 and X2 in Figure 1) when the battery pack 10 is mounted on the electric vehicle. However, this is not particularly limited, and the battery pack 10 can be applied to various devices that require electric power.

As shown in FIG. 2, the battery pack 10 mainly comprises a case 12 forming the exterior, a battery group 16 formed by connecting two battery core packs 14a, 14b, a support frame 18 supporting the battery core packs 14a, 14b, a reinforcing member 20 connected to the support frame 18, a battery management unit (BMU) 22, and a connector portion (not shown).

The case 12 houses the battery core packs 14a and 14b. The case 12 can be formed from, for example, a metal such as aluminum, or a resin (including fiber-reinforced resin). The case 12 has 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 that is open at the top end, and for example, each of the four corners of the bottom surface is provided with a hollow cylindrical or truncated cone-shaped protrusion 32 that protrudes upward (towards the arrow X1). An insertion hole 32a is formed in the tip surface of the protrusion 32, through which the shaft of a bolt 68 (see FIG. 3), which will be described later, is inserted. The inside of the bottom case 24 also houses the above-mentioned connector section and the like.

The connector portion is exposed to the outside of the case 12, for example, through a notch formed in the bottom wall of the bottom case 24, and can be connected to a power supply port of an electric vehicle or a charging device for charging the battery group 16. Note that the above-mentioned notch, power supply port, and charging device are not shown. By connecting the connector portion to the power supply port or charging device, the power supply port or charging device can be electrically connected to the battery group 16 via the BMU 22 by a lead wire (not shown) or the like.

The outer shell case 26 is in the shape of a rectangular cylinder and covers the side of the battery group 16. An upper opening 26a (opening) is provided at the upper end of the outer shell case 26, and a lower opening 26b is provided at the lower end of the outer shell case 26. With the lower opening 26b covered by the bottom case 24 and the upper opening 26a covered by the top case 28, the bottom case 24, outer shell case 26, and top case 28 are integrated. The battery group 16, support frame 18, BMU 22, etc. are housed in the internal space of the case 12 formed by this.

The top case 28 is plate-shaped according to the dimensions of the upper opening 26a. The top case 28 is rectangular in plan view (as viewed from the direction 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 has a pair of grooves 36 extending along the directions of the arrows Z1 and Z2 perpendicular to the directions of the arrows Y1 and Y2 at both ends of the directions of the arrows Y1 and Y2 along one side of the rectangular shape. A rectangular plate-shaped reinforcing member 20 made of metal or the like is housed in each of the grooves 36. The two reinforcing members 20 are arranged parallel to each other. The reinforcing member 20 is arranged on the top case 28 so that the thickness directions of the reinforcing member 20 and the top case 28 are the same. The top case 28 is sandwiched between the support frame 18 and the reinforcing member 20. In this embodiment, the length of the groove 36 in the extension direction is the same as the length of the top case 28 in the directions of the arrows Z1 and Z2, but this is not particularly limited.

As shown in FIG. 5, a pair of locking portions 38 are provided at both ends of each groove 36 in the width direction (direction of arrows Y1 and Y2) to hold the reinforcing member 20 between the bottom 36a of the groove 36. As shown in FIG. 4 and FIG. 5, the pair of locking portions 38 are protrusions that protrude from both ends of the width direction of the groove 36 toward the center in the width direction and extend along the extension direction of the groove 36. The opposing surfaces of the pair of locking portions 38 form inclined guide surfaces 38a that are inclined in a direction away from each other as they move from the lower end to the upper end. That is, the inclined guide surfaces 38a are inclined so as to approach the bottom 36a 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 38b of the locking portion 38 and the bottom 36a of the groove 36.

Through holes 40 (see Figures 3 and 4) are formed in the reinforcing members 20 and the top case 28. Specifically, the through holes 40 are formed in the four corners of the top case 28. In addition, through holes 40 are formed in both ends of each reinforcing member 20 in the longitudinal direction (direction of arrows Z1 and Z2).

2 and 3, a handle 42 is connected to the top surface 28a of the top case 28 via the reinforcing members 20. The handle 42 is gripped by a user, for example, when carrying the battery pack 10. The handle 42 has a set of mounting plate portions 44 that are respectively stacked on the set of reinforcing members 20, a set of legs 46 that are respectively erected on the set of mounting plate portions 44, and a grip portion 48 that is stretched between the set of legs 46.

Each mounting plate 44 is a rectangular plate having dimensions corresponding to the dimensions of the reinforcing member 20. A set of mounting plates 44 extend parallel to each other. As shown in FIG. 3, each mounting plate 44 has a through hole 44a at both ends in the extension direction, which overlap with the through holes 40 in the reinforcing member 20 and the top case 28. The legs 46 protrude upward from approximately the center of each mounting plate 44 in the extension direction. 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, exposes the upper side of the legs 46 and the gripping portion 48, and covers the lower end side of the legs 46, the mounting plate portion 44, the reinforcing member 20, and the upper surface 28a and the side surface 28b of the top case 28. As shown in Figs. 2 and 3, the top cover 30 is formed, for example, by combining a pair of divided members 30a, 30b, and can be divided at approximately the center in the directions of the arrows Z1 and Z2 by a dividing line L (see Fig. 2) extending in the directions of the arrows Y1 and Y2. A pair of notches 50 into which the legs 46 of the handle 42 can be inserted are formed at the end of each divided member 30a, 30b on the dividing line L side.

One divided member 30a is slid from the arrow Z1 side toward the arrow Z2 side on the upper surface 28a of the top case 28, and the other divided member 30b is slid from the arrow Z2 side toward the arrow Z1 side. In this way, the ends of the pair of divided members 30a, 30b on the dividing line L side are abutted against each other, and the legs 46 are inserted into each notch 50. As a result, as described above, the top cover 30 can be attached to cover the remainder of the handle 42 and the reinforcing member 20 and top case 28 that are integrated with each other, while exposing the upper side of the legs 46 and the gripping portion 48.

A support frame 18 is connected to the bottom surface 28c (inner surface) 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 has a plurality of frame members (a first frame 56 and a second frame 58). Specifically, the support frame 18 has a first frame 56 that covers the ridgeline and nearby surfaces on one side surface 52 of a pair of opposing side surfaces 52, 54 (see FIG. 3) of the approximately rectangular parallelepiped battery group 16, as described below, and a second frame 58 that covers the ridgeline and nearby surfaces on the other side surface 54.

Each of the first frame 56 and the second frame 58 has a substantially L-shaped section perpendicular to the extension direction, and is formed by connecting a bottom member 60 and a cover member 62. The bottom member 60 of the first frame 56 is aligned along the bottom edge of the side surface 52 of the battery group 16. The cover member 62 of the first frame 56 has a set of side portions 62a aligned along a set of sides extending in the vertical direction, excluding the bottom edge of the side surface 52 of the battery group 16, and an upper end portion 62b aligned along the upper edge. In addition, an extension portion 62c aligned along a part of the bottom edge of the side surface 52 of the battery group 16 is provided at the lower end of the side portion 62a.

The bottom member 60 of the second frame 58 is aligned along the bottom edge of the side surface 54 of the battery group 16. The cover member 62 of the second frame 58 has a set of side portions 62a aligned along a set of sides extending in the vertical direction, excluding the bottom edge of the side surface 54 of the battery group 16, and an upper end portion 62b aligned along the upper edge. In addition, an extension portion 62c is provided at the lower end of the side portion 62a and aligned along part of the bottom edge of the side surface 54 of the battery group 16.

A pair of connecting members 66 is provided along a pair of sides of the bottom surface of the battery group 16 that are not covered by the bottom member 60. The connecting members 66, the bottom member 60, and the extension portion 62c of the cover member 62 are stacked in the vertical direction, and the shaft portion of the bolt 68 is inserted from the top to the bottom through the stacked portions. The shaft portion of the bolt 68 is also inserted into the insertion holes 32a (see FIG. 2) of the protrusions 32 provided at the four corners of the bottom surface of the bottom case 24 as described above. A nut 69 (see FIG. 3) or the like is attached to the tip of this shaft, so that the support frame 18 and the bottom case 24 are connected via the connecting members 66.

The positional relationship between the support frame 18 and the reinforcing member 20 is set so that the reinforcing member 20 is aligned via the top case 28 along a pair of edges 70a, 70b (see FIG. 3) of the upper surface 70 of the battery group 16 that are not covered by the upper end 62b of the cover member 62. A protrusion 72 protruding upward and a through hole 74 overlapping the through holes 40, 44a are provided at both ends of the upper end 62b of the cover member 62 in the extension direction. By providing the protrusion 72 in this manner, a space is provided between both ends of the upper end 62b in the extension direction and the upper surface 70 of the battery group 16 in which the head of the bolt 34 (insertion member) can be disposed.

The shaft of the bolt 34 is inserted from the bottom to the top through the overlapping through holes 74, 40, 44a, and a nut 75 (see FIG. 2) or the like is provided at the tip of the shaft. This connects the support frame 18, the top case 28, the reinforcing member 20, and the mounting plate 44 of the handle 42 with a connecting mechanism 76 consisting of the bolt 34, the nut 75, etc.

The two battery core packs 14a and 14b that make up the battery group 16 are configured in substantially the same way. For this reason, in the following, we will only explain the battery core pack 14a, and will not go into a detailed explanation of the battery core pack 14b. When there is no need to distinguish between the two battery core packs 14a and 14b, they will be collectively referred to as the battery core packs 14.

As shown in Fig. 6, the battery core pack 14a has a plurality of battery cells 80 and a cell holder 82. As shown in Fig. 2, in this embodiment, the battery group 16 (battery core pack 14) has a rectangular parallelepiped shape with a portion of its lower end side cut out to form a space for accommodating wiring and the like (not shown) between the battery group 16 and the cutout of the bottom case 24.

The battery cell 80 is, for example, cylindrical, and is provided with a positive terminal 86 and a negative terminal 88 at both axial ends. A suitable type of battery cell 80 is a lithium-ion secondary battery, but is not limited thereto. For example, a secondary battery such as a nickel-metal hydride battery or a nickel-cadmium battery may be used.

The cell holder 82 is formed by combining a positive electrode side holder 82a and a negative electrode side holder 82b, and has a holding portion 90, a pressing plate portion 92, and a peripheral wall portion 94. The holding portion 90 has a plurality of holding holes 96, and holds the battery cells 80 in a state in which the battery cells 80 are inserted into the holding holes 96. The holding holes 96 extend in the directions of the arrows Z1 and Z2, and expose the positive electrode terminal 86 or the negative electrode terminal 88 of the battery cell 80 from the openings at both ends in the extension direction.

The positive terminals 86 of the battery cells 80 held in the holding portion 90 are arranged flush with each other, and the negative terminals 88 of the battery cells 80 are arranged flush with each other. In addition, the spaces between the peripheral surfaces of the battery cells 80 held in the holding portion 90 may be filled with a potting material (not shown) made of insulating resin or the like.

The pressing plate portion 92 is provided on both ends of the holding portion 90 in the directions of the arrows Z1 and Z2, and has an exposed portion 98 consisting of a through hole at a position corresponding to the opening of the holding hole 96. The positive 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 side holder 82a. The negative 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 side holder 82b. In the following, the positive terminal 86 and the negative terminal 88 are collectively referred to as electrode terminals.

In addition, a plurality of bus bar plates 100 (see FIGS. 2 and 3) are attached to the pressing plate portion 92 so as to cover the exposed portion 98 that exposes the positive terminal 86 and the exposed portion 98 that exposes the negative terminal 88. The pressing plate portion 92 is provided with protrusions 102 that are interposed between the bus bar plates 100 and insulate them from each other.

Two battery core packs 14a, 14b are connected together so that the negative terminal 88 side of one battery core pack 14a and the positive terminal 86 side of the other battery core pack 14b face each other to form a battery group 16.

The positive terminal 86 side of one battery core pack 14a and the negative terminal 88 side of the other battery core pack 14b, in other words, the side surfaces 52, 54 on both sides of the battery group 16 in the directions of arrows Z1 and Z2, face the inner surface of the outer shell case 26.

Each of the multiple bus bar plates 100 connects a predetermined number of positive electrode terminals 86 or negative electrode terminals 88 in parallel, and has protrusions 104 that penetrate into the exposed portion 98 and contact the electrode terminals, for example, provided by embossing.

The peripheral wall portion 94 is provided so as to surround the retaining portion 90 and the exposed portion 98. In addition, a plurality of grooves 94a are provided on the end surface of the peripheral wall portion 94, into which the connection ends 106 (see Figures 2 and 3) of the bus bar plates 100 are respectively inserted. By connecting these connection ends 106 to the above-mentioned lead wires, etc., the plurality of bus bar plates 100 are connected to the connector portion via the BMU 22 in a state of being connected to each other in series.

As shown in Fig. 3, a protruding wall 108 protruding upward is provided at the upper end of the positive electrode holder 82a of the battery core pack 14a on the side indicated by the arrow Z1, and at the upper end of the negative electrode holder 82b of the battery core pack 14b on the side indicated by the arrow Z2. The BMU 22 is disposed between these protruding walls 108.

The BMU 22 has, for example, a control unit that controls the charging and discharging of the battery core pack 14, a communication unit that communicates with the electric vehicle and the charging device, and a memory unit that stores the state of the battery core pack 14 detected from the temperature and voltage of the battery cells 80, etc. (all not shown).

In the battery pack 10 according to the present embodiment, which is basically configured as described above, the battery cells 80 can be charged, for example, by gripping the handle 42 and carrying the battery pack 10 near a charging device and connecting the connector portion to the charging device. On the other hand, the battery cells 80 can be discharged, for example, by gripping the handle 42 and carrying the battery pack 10 near the charging device and connecting the connector portion to the charging device, and mounting the battery pack 10 on an electric vehicle so that the connector portion is connected to the power supply port.

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 form a frame structure together with the reinforcing member 20. This increases the rigidity of the support frame 18. Furthermore, 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, unlike a reinforcing member (not shown) whose strength and rigidity are increased by, for example, providing ribs on the side edges or increasing the thickness, it is possible to avoid an increase in the weight of the reinforcing member 20 and a decrease in the ease of assembly of the reinforcing member 20.

Therefore, it is possible to effectively suppress rattling of the battery core pack 14 inside the case 12 by increasing the rigidity of the support frame 18 while suppressing an increase in the weight of the battery pack 10 and a decrease in ease of assembly. In other words, this battery pack 10 is lightweight and has excellent ease of assembly and durability.

Furthermore, in this battery pack 10, the integrated top case 28 and reinforcing member 20 can be handled as a sub-assembly. Furthermore, the strength and rigidity of the reinforcing member 20 can be increased by integrating it with the top case 28 to close the upper opening 26a of the outer shell case 26. In other words, additional components for increasing the strength and rigidity of the reinforcing member 20 are not required. These also make it possible to effectively reduce the weight of the battery pack 10 and improve its ease of assembly.

As described above, in this embodiment, the reinforcing member 20 is plate-shaped. This simple configuration makes it possible to further reduce the weight of the reinforcing member 20 and to easily manufacture the reinforcing member 20. Note that the reinforcing member 20 is not limited to being plate-shaped, and may have any shape that can be integrated with the top case 28 and is interposed between the top case 28 and the support frame 18 to increase the connection strength between the top case 28 and the support frame 18.

As described above, in this embodiment, the top case 28 is a plate formed to fit the shape of the opening (upper opening 26a), and the reinforcing member 20 is arranged on top of the top case 28 so that the thickness directions of the reinforcing member 20 and the top case 28 are aligned. This makes it possible to reduce the thickness of the integrated top case 28 and reinforcing member 20.

As described above, in this embodiment, the top case 28 has a groove 36 that houses the reinforcing member 20, and a locking portion 38 that is provided on the edge of the groove 36 in the width direction and that holds the reinforcing member 20 between the groove 36 and the bottom 36a of the groove 36. In this case, the top case 28 and the reinforcing member 20 can be easily integrated with a simple configuration.

In addition, in this embodiment, the locking portion 38 is a protrusion that protrudes from the edge of the groove portion 36 in the width direction toward the center in the width direction and extends along the extension direction of the groove portion 36. This makes it possible to more reliably integrate the top case 28 and the reinforcing member 20. Furthermore, the locking portion 38, which is a protrusion, plays a role similar to that of a rib provided on the side edge of the reinforcing member 20, making it possible to more effectively increase the strength and rigidity of the reinforcing member 20.

The structure for integrating the top case 28 and the reinforcing member 20 is not limited to the groove 36 and the locking portion 38. The locking portion 38 may be one or more protruding claws instead of a protrusion.

Furthermore, in this embodiment, the locking portions 38 are a pair of protrusions that protrude from both widthwise edges of the groove portion 36 toward the center in the widthwise direction and extend along the extension direction of the groove portion 36. In this way, by providing a pair of locking portions 38, the top case 28 and the reinforcing member 20 can be more firmly integrated.

As described above, in this embodiment, the locking portion 38 has an inclined guide surface 38a that approaches the bottom 36a of the groove portion 36 toward the center side in the width direction of the groove portion 36. This makes it easier to insert the reinforcing member 20 into the groove portion 36, thereby further improving the assembly of the battery pack 10. In addition, by providing the inclined guide surface 38a, it is also easier to insert the mounting plate portion 44 of the handle 42 into the groove portion 36 when stacking the mounting plate portion 44 on the reinforcing member 20. When inserting the reinforcing member 20 into the groove portion 36, the reinforcing member 20 may be slid from one end of the groove portion 36 along the extension direction, or the reinforcing member 20 may be fitted into the inside of the groove portion 36 from above the groove portion 36.

As described above, in this embodiment, the top case 28 is sandwiched between the support frame 18 and the reinforcing member 20. This allows the top case 28 and the reinforcing member 20 to be firmly integrated. In addition, the positioning of the mounting plate portion 44 of the handle 42 and the reinforcing member 20 can be easily determined, improving the ease of assembly of the battery pack 10.

As described above, in the battery pack 10 according to this embodiment, the top case 28 has an inner surface (lower surface 28c) facing the support frame 18 and an outer surface (upper surface 28a) to which the handle 42 to be gripped by the user is attached. The reinforcing members 20 are a set of rectangular plates arranged at intervals from each other on the outer surface of the top case 28. The handle 42 has a set of mounting plate portions 44 that are stacked on the set of reinforcing members 20, a set of legs 46 that are erected on the set of mounting plate portions 44, and a grip portion 48 that is suspended between the set of legs 46. The reinforcing members 20 integrated with the top case 28, the support frame 18, and the mounting plate portion 44 are connected by a connecting mechanism 76 having an insertion member (bolt 34) that is inserted into each of the stacked portions along the stacking direction.

In this battery pack 10, for example, when a user grasps the handle 42 and lifts the battery pack 10, a reaction force corresponding to the weight of the battery group 16 is generated in the reinforcing member 20 interposed between the handle 42 and the support frame 18. Even if such a reaction force is generated, as described above, the strength and rigidity of the reinforcing member 20 are increased, so that the handle 42 and the support frame 18 can be maintained in a good connection via the reinforcing member 20. In other words, the durability of the battery pack 10 can be effectively improved.

The reinforcing member 20 may be attached to the bottom surface 28c of the top case 28 instead of the top surface 28a. The reinforcing member 20 is not limited to two rectangular plates, but may be one, or three or more. The connecting mechanism 76 is not limited to having the bolts 34 and nuts 75, but may be any mechanism capable of connecting the top case 28 and the support frame 18 via the reinforcing member 20.

As described above, in this embodiment, the case 12 has a top cover 30. The top cover 30 exposes the grip portion 48 and covers at least a portion of the set of mounting 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 favorably connecting the support frame 18, the top case 28, and the handle 42 to improve the durability of the battery pack 10. Note that the case 12 does not have to have a top cover 30.

The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit and scope of the present invention.

For example, the battery pack 10 according to the above embodiment includes a battery group 16 in which two battery core packs 14a, 14b are connected together. 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 together.

In addition, in the above embodiment, the support frame 18 has the first frame 56 and the second frame 58, but is not limited to this. The support frame 18 may be configured to support the battery group 16 (battery core pack 14) inside the case 12. Furthermore, the configuration for connecting the support frame 18 to the bottom case 24 is not limited to the bolts 68 and nuts 69 described above.

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)
The battery cell includes a bottom portion and a grip portion, and a handle portion and a mounting plate portion are provided on the bottom portion and the grip portion, respectively.

Claims (8)

A battery pack (10) comprising: a battery core pack (14) having a plurality of battery cells (80) held in a cell holder (82); and a case (12) for accommodating the battery core pack,
A support frame (18) for supporting the battery core pack inside the case is further provided.
The case has an outer shell case (26) having an opening (26a) and a top case (28) covering the opening,
The support frame includes a plurality of frame members (56, 58);
The plurality of frame members are connected to a reinforcing member (20) that is integrated with the top case,
The reinforcing member is plate-shaped,
The top case is a plate-like shape formed along the shape of the opening,
The reinforcing member is disposed on the top case so that the thickness direction of the reinforcing member and the thickness direction of the top case are aligned. A battery pack (10) comprising: a battery core pack (14) having a plurality of battery cells (80) held in a cell holder (82); and a case (12) for accommodating the battery core pack,
A support frame (18) for supporting the battery core pack inside the case is further provided.
The case has an outer shell case (26) having an opening (26a) and a top case (28) covering the opening,
The support frame includes a plurality of frame members (56, 58);
The plurality of frame members are connected to a reinforcing member (20) that is integrated with the top case,
The top case of the battery pack has a groove portion (36) that accommodates the reinforcing member, and a locking portion (38) that is provided on the widthwise edge of the groove portion and clamps the reinforcing member between the groove portion and a bottom portion (36a) of the groove portion. 3. The battery pack according to claim 2 ,
The battery pack, wherein the locking portion is a protrusion that protrudes from an edge of the groove in a width direction toward a center in the width direction and extends along the extension direction of the groove. 3. The battery pack according to claim 2 ,
The engaging portion is a pair of protrusions that protrude from both widthwise edges of the groove portion toward the center in the widthwise direction and extend along the extension direction of the groove portion. 5. The battery pack according to claim 3 ,
The engaging portion has an inclined guide surface (38a) approaching a bottom of the groove toward a center side of the groove in the width direction. A battery pack (10) comprising: a battery core pack (14) having a plurality of battery cells (80) held in a cell holder (82); and a case (12) for accommodating the battery core pack,
A support frame (18) for supporting the battery core pack inside the case is further provided.
The case has an outer shell case (26) having an opening (26a) and a top case (28) covering the opening,
The support frame includes a plurality of frame members (56, 58);
The plurality of frame members are connected to a reinforcing member (20) that is integrated with the top case,
The top case is sandwiched between the support frame and the reinforcing member. A battery pack (10) comprising: a battery core pack (14) having a plurality of battery cells (80) held in a cell holder (82); and a case (12) for accommodating the battery core pack,
A support frame (18) for supporting the battery core pack inside the case is further provided.
The case has an outer shell case (26) having an opening (26a) and a top case (28) covering the opening,
The support frame includes a plurality of frame members (56, 58);
The plurality of frame members are connected to a reinforcing member (20) that is integrated with the top case,
The top case has an inner surface (28c) facing the support frame and an outer surface (28a) to which a handle (42) for a user to grip is attached,
the reinforcing member is a pair of rectangular plates arranged at intervals on the outer surface of the top case,
The handle includes a pair of mounting plate portions (44) respectively stacked on the pair of reinforcing members, a pair of legs (46) respectively erected on the pair of mounting plate portions, and a grip portion (48) suspended between the pair of legs,
A battery pack in which the reinforcing member integrated with the top case, the support frame, and the mounting plate portion are connected by a connecting mechanism (76) having an insertion member (34) that is inserted into each of the stacked portions along the stacking direction. 8. The battery pack according to claim 7 ,
The case has a top cover (30),
The top cover exposes the grip portion and covers the set of mounting plate portions, the set of reinforcing members, and at least a portion of the top case.

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