JP7382998B2 - Vehicle power storage device - Google Patents

Description

The present invention relates to a power storage device for a vehicle.

BACKGROUND ART Conventionally, a power storage device is known that is disposed below a trunk room in a vehicle (for example, see Patent Document 1). This power storage device is formed into a pack shape by accommodating a plurality of cells held by a frame in a housing part and covering the top surface with a cover part. A support member to be attached to the vehicle body is attached to a frame that holds the cells, and is provided so as to protrude laterally from between the accommodating part and the cover part.

Japanese Patent Application Publication No. 2020-191192

In a conventional power storage device, a metal cover reinforcing member is provided on the back surface of the cover part in order to suppress deformation due to input from the vehicle body and protect the cells in the storage part. Therefore, in the conventional power storage device, there is a problem that the thickness of the cover portion increases, and the dimension in the height direction when formed into a pack shape increases.

An object of the present invention is to provide a power storage device for a vehicle that can reduce the size in the height direction when the power storage device is packaged.

(1) The present invention provides a power storage device for a vehicle (for example, power storage device 1 described below), which includes a plurality of cells (for example, cells 21 described below) lined up in a first direction (for example, D1 direction described below), Termination members (for example, termination members 23 described later) disposed at both ends of the plurality of cells in the first direction, and terminal members disposed in the second direction (for example, A power storage module holder (for example, a power storage module holder 2 to be described later) having a facing member (for example, a facing member 24 to be described later) disposed at both ends of the power storage module holder (D2 direction), A reinforcing portion (for example, a reinforcing portion 25 to be described later) that connects the end members is provided on an upper surface (for example, an upper surface 24a to be described later) of the facing member.

(2) In the vehicle power storage device according to (1) above, the opposing member extends along the first direction, and the reinforcing portion forms a closed cross section with the opposing member. It may be.

(3) In the power storage device for a vehicle according to (1) or (2) above, the storage portion (for example, a housing section 3) to be described later; a cover section (for example, a cover section 4 to be described later) that covers the opening of the housing section; and a support for fixing the power storage device to a vehicle body (for example, a vehicle body 100 to be described later). The device may further include a member (for example, a support member 5 to be described later), and the support member may be removably fixed to the end member with the cover portion interposed therebetween.

(4) In the vehicle power storage device according to any one of (1) to (3) above, the plurality of cells are electrically connected in series, and the power storage module holder electrically connects the plurality of cells. A mid-point interrupting member (for example, the mid-point interrupting member 27 described below) is connected to a terminal of the cell located at one end in the first direction by a power line (for example, a power line 28 described below). Furthermore, the midpoint blocking member may be fixed to the reinforcing portion.

(5) In the power storage device for a vehicle according to any one of (1) to (4) above, the power storage module holder includes a bridging portion (for example, a It may further include a bridging portion 26).

According to the vehicle power storage device described in (1) above, since the power storage module holder itself is reinforced by the reinforcing portion on the upper surface of the opposing member, the cover provided on the cover portion when the power storage device is packaged A reinforcing member can be made unnecessary. Therefore, the cover portion can be made thinner, and the height dimension of the power storage device to be packed can be suppressed.

According to the power storage device for a vehicle described in (2) above, the closed cross section is formed between the reinforcing member that connects the end members and the opposing member extending in the first direction, so that the power storage module holder The rigidity is further improved. Therefore, when a load is applied to the power storage module holder, deformation of the power storage module holder can be effectively suppressed, and the cells can be more suitably protected.

According to the vehicle power storage device described in (3) above, since the reinforcing portion of the power storage module holder housed in the storage portion is arranged near the cover portion, the power storage module holder allows input from the vehicle body to the cover portion. It is also possible to suppress the deformation of. In addition, since the support member is removably fixed to the end member with the cover part in between, the type of support member can be easily changed depending on the vehicle model while the power storage module holder is covered with the cover part. . Therefore, the power storage device can be easily shared by different vehicle types.

According to the power storage device for a vehicle described in (4) above, since the midpoint interrupting member is fixed to the reinforcing portion, the service plug can be provided near the cover portion. Moreover, since the reinforcing section has high rigidity and is less likely to deform due to external input, by fixing the midpoint cutoff member to the reinforcing section, bending of the power line during external input is also suppressed.

According to the vehicle power storage device described in (5) above, since the reinforcing parts are connected by the bridging part along the second direction, the strength of the power storage module holder is further improved, especially against loads from the second direction. do.

FIG. 1 is a perspective view, cut away, of the rear part of a vehicle body in which a power storage device for a vehicle according to the present invention is mounted. 1 is a perspective view showing a power storage device for a vehicle according to the present invention. FIG. 1 is an exploded perspective view showing a power storage device for a vehicle according to the present invention. FIG. 2 is a perspective view showing a power storage module holder of a power storage device for a vehicle according to the present invention. FIG. 2 is an exploded perspective view showing a facing member and a reinforcing member of a power storage device for a vehicle according to the present invention. 6 is a partially enlarged view showing a cross-sectional view taken along line AA in FIG. 5. FIG. FIG. 3 is a perspective view showing a frame structure of a power storage module holder of a power storage device for a vehicle according to the present invention. FIG. 3 is a diagram showing how a vertical load is applied from the vehicle body to the power storage module holder of the vehicle power storage device according to the present invention. FIG. 3 is a diagram showing how a load in a torsional direction is applied from a vehicle body to a power storage module holder of a power storage device for a vehicle according to the present invention. FIG. 3 is an enlarged perspective view showing a portion of a midpoint cutoff member provided on a power storage module holder of a power storage device for a vehicle according to the present invention. FIG. 6 is a diagram illustrating the effect of changing the support member in the vehicle power storage device according to the present invention.

Embodiments of the present invention will be described in detail below with reference to the drawings. As shown in FIG. 1, power storage device 1 is arranged in underfloor space 102 of trunk room 101 provided at the rear of vehicle body 100, and is fixed to vehicle body 100.

Here, the direction in power storage device 1 will be defined. The D1 direction indicated by the coordinates in the figure is the length direction of the power storage device 1. The D2 direction is the width direction of the power storage device 1. Direction D3 is the height direction of power storage device 1. The directions D1, D2, and D3 are orthogonal to each other. In this embodiment, the D1 direction indicates the first direction, and the D2 direction indicates the second direction. As shown in FIG. 1, power storage device 1 is arranged such that the length direction of power storage device 1 is along the width direction of vehicle body 100, and the width direction of power storage device 1 is along the traveling direction of vehicle body 100.

As shown in FIGS. 2 and 3, the power storage device 1 includes a power storage module holder 2, an accommodating section 3 consisting of a bottomed container having an opening 3a on the top surface, and a cover section 4 that covers the opening 3a of the accommodating section 3. , and a pair of support members 5 for fixing power storage device 1 to vehicle body 100. The power storage module holder 2 is housed inside the housing section 3 .

As shown in FIG. 4, the power storage module holder 2 has a plurality of cells 21 arranged along the D1 direction. The cells 21 are formed in a box shape each having a pair of positive and negative electrode terminals (not shown), and are arranged in plural along the D1 direction with the electrode terminals oriented horizontally. One cell group 20 is configured by arranging a plurality of cells 21 in the D1 direction. The power storage module holder 2 of this embodiment has four cell groups 20, two each arranged in the D1 direction and the D2 direction. The plurality of cells 21 in the cell group 20 are electrically connected in series.

As shown in FIG. 6, a fixing bracket 22 extending in the height direction of the cell group 20 is arranged between the two cell groups 20 aligned in the D1 direction. The fixing brackets 22 are provided corresponding to the four cell groups 20, respectively. The upper end of the fixed bracket 22 locks the upper surface of the cell group 20, and the lower end of the fixed bracket 22 is fixed to a bottom member (not shown) having a cooling duct that introduces cooling air into the cell group 20. .

At both ends in the D1 direction where a plurality of cells 21 are lined up, terminal members 23 each made of a metal plate are arranged parallel to each other and facing each other with the four cell groups 20 in between. The end member 23 has a width and a height that can cover the entire end faces in the D1 direction of the two cell groups 20 arranged in the D2 direction. On the upper surface 23a of the end member 23, four bolt shafts 23b for fixing a support member 5, which will be described later, are provided to protrude upward, respectively.

At both ends of the plurality of cells 21 in the D2 direction perpendicular to the D1 direction, opposing members 24 each made of a metal plate are arranged parallel to each other and facing each other with the four cell groups 20 in between. The opposing member 24 extends along the D1 direction, and has a height substantially equal to the height of the end member 23 and a length spanning the pair of end members 23, 23. The opposing member 24 is fixed to both ends of the end member 23 in the width direction by fastening members such as bolts (not shown), and connects the pair of end members 23 , 23 .

The basic structure of the power storage module holder 2 is formed by surrounding the four peripheries of the four cell groups 20 each consisting of a plurality of cells 21 by the termination member 23 and the opposing member 24. As shown in FIG. 3, the power storage module holder 2 is housed in the housing section 3, and is packed into a pack by covering the opening 3a of the housing section 3 with the cover section 4. The cover part 4 is fastened to the housing part 3 by a fastening member such as a bolt (not shown). The cover portion 4 has through holes 4a through which the bolt shafts 23b protruding from the upper surface 23a of the end member 23 are respectively passed. The bolt shaft 23b passes through the through hole 4a of the cover section 4 that covers the opening 3a of the housing section 3, and projects onto the surface of the cover section 4.

The support members 5 are made of metal brackets, and are arranged at both ends of the power storage device 1 in the D1 direction. The support member 5 has four mounting holes 5a into which the four bolt shafts 23b protruding from the surface of the cover portion 4 are inserted. After the opening 3a of the accommodating part 3 is covered by the cover part 4, the support member 5 inserts the bolt shaft 23b protruding from the surface of the cover part 4 into the mounting hole 5a, and inserts the bolt shaft 23b with the cover part 4 in between. It is attached to the surface of the cover part 4 by screwing the nut 5b into the cover part 4. Support members 5 attached to cover portion 4 project laterally from both ends of power storage device 1 in the length direction. The support member 5 is attached with a nut 5b, so it can be easily attached and detached.

Here, the reinforcing structure of the power storage module holder 2 will be explained. As shown in FIGS. 3, 4, and 5, reinforcing portions 25 made of metal plates are provided on the upper surfaces 24a, 24a of the pair of opposing members 24, 24 of the power storage module holder 2, respectively. The reinforcing portion 25 extends along the D1 direction, which is the direction in which the opposing member 24 extends, and is integrated with the opposing member 24 by welding. The reinforcing portion 25 is provided across the pair of end members 23, 23, and is fixed to the upper surface 23a of the end member 23 with a fastening member such as a bolt, so that the reinforcing portion 25 extends between the pair of end members 23, 23 together with the opposing member 24. are connected.

The reinforcing portions 25 are each formed by bending a narrow metal plate material in the D2 direction. Specifically, as shown in FIG. 6, the reinforcing portion 25 includes a vertical plate portion 25a that extends upward along the surface of the opposing member 24, and a vertical plate portion 25a that extends outward from the opposing member 24 from the upper end of the vertical plate portion 25a. It has a bent portion 25b that bends, and an upper plate portion 25c that extends toward the inner side of the opposing member 24 from the upper end of the bent portion 25b. The upper plate portion 25c is in contact with the upper surface 24a of the opposing member 24. As a result, the bending strength of the reinforcing portion 25 is improved, and the bending strength of the opposing member 24 to which this reinforcing portion 25 is integrally provided is also improved. Therefore, the power storage module holder 2 itself is reinforced by the reinforcing portion 25, and its rigidity is improved.

As a result, for example, as shown in FIGS. 7 and 8, when a load F1 input from the longitudinal direction of the vehicle body 100 and a load F2 input from the vertical direction of the vehicle body 100 act on the power storage module holder 2, The opposing member 24 is firmly supported by the reinforcing portion 25 and is restrained from bending in the D2 direction and the D3 direction. Furthermore, as shown in FIG. 9, even when a torsional force F3 along the D2 direction is applied to the power storage module holder 2, the reinforcing part 25 is fixed to the end member 23 together with the opposing member 24. , twisting is suppressed. Therefore, the power storage module holder 2 can highly protect the internal cells 21.

Since the power storage module holder 2 is reinforced by the reinforcing portion 25 on the upper surface 24a of the opposing member 24 and its rigidity is improved, the reinforcement structure of the cover portion 4 when the power storage device 1 is packaged is unnecessary and simplified. I can do it. Therefore, the cover portion 4 can be made thinner, and the height dimension of the power storage device 1 can be suppressed. As a result, it is possible to lower the height of the trunk room 101 of the vehicle body 100 and expand the capacity of the trunk room 101.

Moreover, since the reinforcing part 25 is provided on the upper surface 24a of the opposing member 24, it is arranged near the cover part 4 when the power storage module holder 2 is accommodated in the accommodating part 3 and packed. Therefore, the power storage module holder 2 can also suppress deformation of the cover part 4 due to input from the vehicle body 100.

As shown in FIG. 6, the reinforcing portion 25 has a bent portion 25b that is bent so as to project outward from the opposing member 24, so that there is a closed portion between the bent portion 25b and the surface of the opposing member 24. Spaces S are respectively formed. That is, the reinforcing portion 25 forms a closed cross section with the opposing member 24. This further improves the rigidity of the power storage module holder 2, so that when loads F1, F2 and torsional force F3 are applied to the power storage module holder 2, as shown in FIGS. 7, 8, and 9, Deformation of the power storage module holder 2 can be effectively suppressed. Therefore, the power storage module holder 2 can protect the internal cells 21 more suitably.

The power storage module holder 2 can include a bridging portion 26 that connects the pair of reinforcing portions 25, 25 along the D2 direction. The bridging portion 26 is formed of a metal plate material, and as shown in FIG. 6, is arranged above between the two cell groups 20 aligned in the D1 direction. The bridging portion 26 is fixed to the reinforcing portions 25, 25 at both ends using fastening members such as bolts. By providing the bridging portion 26 in the power storage module holder 2, the strength between the pair of end members 23, 23 in the power storage module holder 2 is further improved. Strength is further improved. The number of bridging portions 26 is not limited to one, and a plurality of bridging portions 26 may be provided depending on the size of the power storage module holder 2.

As shown in FIG. 10, the power storage module holder 2 can further include a midpoint blocking member 27. The midpoint cutoff member 27 is a member (service plug of the power storage device 1) that electrically cuts off the plurality of cells 21, and is connected to a terminal (not shown) of the cell 21 located at one end in the D1 direction. They are connected by a power line 28. The midpoint blocking member 27 is fixed to the reinforcing portion 25 via a bracket 29 with a fastening member such as a bolt (not shown). Note that in FIGS. 3 and 4, only the bracket 29 is shown, and the midpoint blocking member 27 and the power line 28 are not shown.

In this way, when the power storage module holder 2 is provided with the midpoint cutoff member 27, the midpoint cutoff member 27 is fixed to the reinforcing part 25, so the service plug of the power storage device 1 is arranged near the cover part 4. can be done. Since the reinforcing part 25 has high rigidity and is less deformed by external input, by fixing the midpoint cutoff member 27 to the reinforcing part 25, bending of the power line 28 at the time of external input is also suppressed. .

The power storage device 1 in which the power storage module holder 2 configured as described above is arranged inside the housing part 3 and the cover part 4 is arranged in the underfloor space 102 of the trunk room 101 of the vehicle body 100, as shown in FIG. , are fixed to the vehicle body 100 at the distal end portions of the pair of support members 5, 5 using fastening members such as bolts (not shown). At this time, the support member 5 can be easily attached and detached using the nut 5b, so even if the attachment location of the vehicle body 100 changes due to different vehicle models, the power storage device 1 can be easily installed by replacing the support member 5. Can be shared.

For example, as shown in FIG. 11, in a power storage device 1 to which a support member 5A having a shape bent downward from the position of the cover part 4 is attached, the support member 5A has a shape extending substantially horizontally from the cover part 4. By replacing the support member 5B with a support member 5B having the above structure, the upper end of the power storage device 1 when attached to the vehicle body 100 can be lowered. Thereby, the capacity of the trunk room 101 can be expanded. On the contrary, by replacing support member 5B with support member 5A, the position of the lower end of power storage device 1 when attached to vehicle body 100 can be raised. Thereby, for example, when a differential gear is disposed below the underfloor space 102, the power storage device 1 can be easily disposed so as to avoid interference with the differential gear. In addition, since such a support member 5 can be replaced while the power storage module holder 2 in the housing section 3 is covered with the cover section 4, the replacement work can be easily performed.

As described above, the vehicle power storage device 1 of this embodiment has the following effects. That is, the power storage device 1 of the vehicle includes a plurality of cells 21 arranged in the D1 direction, termination members 23 disposed at both ends of the plurality of cells 21 in the D1 direction, and a D2 line of the plurality of cells 21 that is orthogonal to the D1 direction. The power storage module holder 2 includes opposing members 24 disposed at both ends in the direction. The power storage module holder 2 has a reinforcing portion 25 on the upper surface 24a of the opposing member 24, which connects the end members 23, 23. According to this, since the electricity storage module holder 2 itself is reinforced by the reinforcing part 25 on the upper surface 24a of the opposing member 24, there is no need for a cover reinforcing member provided on the cover part 4 when the electricity storage device 1 is packed. It can be done. Therefore, the cover portion 4 can be made thinner, and the height dimension of the power storage device 1 to be packed can be suppressed.

In the vehicle power storage device 1 of this embodiment, the opposing member 24 extends along the D1 direction. The reinforcing portion 25 forms a closed cross section with the opposing member 24. According to this, the rigidity of the power storage module holder 2 is further improved. Therefore, when a load is applied to the power storage module holder 2, deformation of the power storage module holder 2 can be effectively suppressed, and the internal cells 21 can be more suitably protected.

A power storage device 1 for a vehicle according to the present embodiment includes a housing section 3 that has an opening 3a on the top surface and stores a power storage module holder 2 therein, a cover section 4 that covers the opening 3a of the housing section 3, and a vehicle body 100. The power storage device 1 further includes a support member 5 for fixing the power storage device 1 thereto. The support member 5 is removably fixed to the terminal member 23 with the cover portion 4 in between. According to this, since the reinforcing part 25 of the power storage module holder 2 housed in the housing part 3 is arranged near the cover part 4, the power storage module holder 2 deforms the cover part 4 due to the input from the vehicle body 100. can also be suppressed. Furthermore, since the support member 5 is removably fixed to the terminal member 23 with the cover part 4 in between, the type of support member 5 can be easily changed depending on the vehicle type while the power storage module holder 2 is covered with the cover part 4. can be changed to . Therefore, power storage device 1 can be easily shared by different vehicle types.

In the vehicle power storage device 1 of this embodiment, the plurality of cells 21 are electrically connected in series. The power storage module holder 2 further includes a midpoint interrupting member 27 that electrically interrupts the plurality of cells 21 and is connected by a power line 28 to a terminal of the cell 21 located at one end in the D1 direction. The midpoint blocking member 27 is fixed to the reinforcing portion 25 . According to this, the service plug can be provided near the cover part 4. Moreover, since the reinforcing part 25 has high rigidity and is less deformed by external input, by fixing the midpoint cutoff member 27 to the reinforcing part 25, bending of the power line 28 during external input is also suppressed. be done.

In the vehicle power storage device 1 of this embodiment, the power storage module holder 2 further includes a bridging portion 26 that connects the reinforcing portions 25, 25 along the D2 direction. According to this, the strength of the power storage module holder 2 against loads particularly from the D2 direction is further improved.

1 Power storage device 2 Power storage module holder 21 Cell 23 Terminal member 24 Opposing member 24a (of the opposing member) Top surface 25 Reinforcement part 26 Bridging part 27 Midpoint blocking member 28 Power line 3 Accommodation part 3a Opening 4 Cover part 5 Support member 100 Vehicle body D1 First direction D2 Second direction

Claims (4)

A power storage device for a vehicle,
A plurality of cells lined up in a first direction,
terminating members disposed at both ends of the plurality of cells in the first direction;
comprising a power storage module holder having opposing members disposed at both ends of the plurality of cells in a second direction perpendicular to the first direction;
The electricity storage module holder has a reinforcing portion on the upper surface of the opposing member that connects the end members,
the opposing member extends along the first direction,
In the power storage device for a vehicle , the reinforcing portion forms a closed cross section with the opposing member . A power storage device for a vehicle,
A plurality of cells lined up in a first direction,
terminating members disposed at both ends of the plurality of cells in the first direction;
comprising a power storage module holder having opposing members disposed at both ends of the plurality of cells in a second direction perpendicular to the first direction;
The power storage module holder has a reinforcing portion connecting the end members on the upper surface of the opposing member, and a bridging portion connecting the reinforcing portions along the second direction, the power storage device for a vehicle. . an accommodating part having an opening on the top surface and accommodating the electricity storage module holder therein;
a cover part that covers the opening of the accommodating part;
further comprising a support member for fixing the power storage device to the vehicle body,
The power storage device for a vehicle according to claim 1 or 2, wherein the support member is removably fixed to the end member with the cover section in between. the plurality of cells are electrically connected in series,
The power storage module holder further includes a midpoint interrupting member that electrically interrupts the plurality of cells and is connected to a terminal of the cell located at one end in the first direction by a power line,
The power storage device for a vehicle according to claim 1, wherein the midpoint cutoff member is fixed to the reinforcing portion.

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