JP7063794B2 - Power storage device - Google Patents

Description

The present disclosure relates to a power storage device.

The power storage device includes a power storage module in the case. A power storage module is configured by stacking a plurality of power storage cells in a predetermined direction. As disclosed in Patent Documents 1 and 2 below, in order to optimize the temperature of the power storage module, that is, it is possible to charge and discharge the power storage module with a smaller number of stacked storage cells with higher efficiency. Therefore, the power storage device is provided with a cooler and a heater.

Japanese Unexamined Patent Publication No. 2010-129392 China Utility Model Announcement No. 206947463

Generally, since the positive electrode terminal and the negative electrode terminal are arranged on the upper surface side of the storage cell, the cooler and the heater are arranged on the bottom surface side of the storage cell (storage module). The coolers and heaters disclosed in Patent Documents 1 and 2 are stacked in the vertical direction, and the heater is sandwiched between the bottom surface of the storage cell and the cooler. When such a configuration is adopted, the heater is easily affected by the vibration generated in the power storage module, and the heater is easily damaged.

In order to reduce the influence of vibration, it is conceivable to place a heater on the side of the cooler. However, if the cooler and the heater are simply arranged side by side, it is necessary to provide a protective insulating member in the cooler and separately provide a protective insulating member in the heater.

It is an object of the present disclosure to provide a power storage device adopting a novel configuration in which it is not necessary to provide separate insulating members for the cooler and the heater arranged on the bottom surface side of the power storage module.

The power storage device is arranged on a power storage module including a plurality of power storage cells stacked in the first direction, a cooler arranged on the bottom surface side of the power storage module to cool the power storage module, and on the bottom surface side of the power storage module. The heater is adjacent to the cooler in the second direction, which is orthogonal to both the first direction and the vertical direction, and raises the temperature of the power storage module, and the second direction as seen from the cooler. The present invention includes a side portion of the cooler located on the side of the heater, or a fixed portion provided on the side portion of the heater located on the side of the cooler in the second direction when viewed from the heater. The cooler and the heater are integrated with each other via the fixed portion, and the power storage device integrally covers the cooler, the fixed portion, and the heater as a whole. Further members are provided.

According to the power storage device, the cooler and the heater are appropriately protected by the insulating member, and the cooler and the heater are insulated from the power storage module by the insulating member, so that the possibility of a short circuit from the power storage module is reduced. The heater is mounted on the cooler as an integral type, and according to the configuration, the height defined by the cooler and the heater can be easily lowered, and space can be saved. It is not necessary to provide separate insulating members for the cooler and the heater arranged on the bottom surface side of the power storage module. Manufacturing costs can also be expected to decrease due to the reduction in the number of parts and man-hours for mounting.

According to the power storage device of the present disclosure, it is possible to obtain a novel configuration in which it is not necessary to provide separate insulating members for the cooler and the heater arranged on the bottom surface side of the power storage module.

It is a figure which shows the vehicle 100 which carried the power storage device 5 in Embodiment 1. FIG. It is sectional drawing which shows the power storage device 5 in Embodiment 1. FIG. It is sectional drawing which shows the power storage device 5 in Embodiment 1. FIG. FIG. 3 is a cross-sectional view taken along the line IV-IV in FIG. It is sectional drawing which shows the power storage device 5Y in the comparative example 1. FIG. It is sectional drawing which shows the power storage device 5Z in the comparative example 2. FIG. It is a perspective view which shows the disassembled state of the sheet type heater 16 provided in the power storage device 5Z in the comparative example 2. FIG. It is sectional drawing which shows the power storage device 5A in Embodiment 2. FIG. It is sectional drawing which shows the power storage device 5B in Embodiment 3. FIG.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the description of the embodiments shown below, the same or common parts may be designated by the same reference numerals in the drawings, and the description thereof may not be repeated.

[Embodiment 1]
(Vehicle 100)
FIG. 1 is a diagram showing a vehicle 100 equipped with a power storage device 5. The vehicle 100 includes a vehicle body 1, a rotary electric machine 2, 3, a PCU 4 (PCU: Power Control Unit), a power storage device 5, an engine (not shown), and the like.

The power storage device 5 is composed of a rechargeable secondary battery. The power storage device 5 supplies electric power to the PCU 4, and the rotary electric machine 2 is driven by the electric power supplied to the PCU 4, whereby the vehicle 100 travels. The rotary electric machine 3 mainly functions as a generator, and the electric power generated by the rotary electric machine 3 is supplied to the power storage device 5 through the PCU 4. The power storage device 5 is mounted in, for example, the vehicle body 1. The power storage device 5 is not limited to the inside of the vehicle body 1, and may be arranged outside the vehicle body 1 such as the lower surface of the floor panel of the vehicle body 1.

The power storage device 5 according to the present disclosure can be applied not only to a hybrid vehicle but also to an electric vehicle or a fuel cell vehicle. The power storage device 5 applied to the hybrid vehicle can be applied to any of the series system, the parallel system and the series parallel system. The power storage device 5 is not limited to a hybrid vehicle provided with two rotary electric machines, but can also be applied to a so-called one-motor hybrid provided with one rotary electric machine.

(Power storage device 5)
FIG. 2 is a cross-sectional view showing the power storage device 5, and shows a state in which the power storage device 5 appears when the power storage device 5 is virtually cut by a cross section parallel to the horizontal direction. FIG. 3 is a cross-sectional view showing the power storage device 5, and shows a state in which the power storage device 5 appears when the power storage device 5 is virtually cut by a cross section parallel to the vertical direction. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

As shown in FIGS. 2 to 4, the power storage device 5 includes a case 6, a power storage module 7, end plates 8a and 8b, restraint bands 9a and 9b (FIG. 2), and a heat transfer member 10 (FIGS. 3 and 4). A cooler 11, a heater 12, a fixing portion 13 (FIG. 4), and an insulating member 14 (FIG. 4) are provided.

The power storage module 7 is housed in the case 6. The power storage module 7 includes a plurality of power storage cells 7a stacked in the first direction (arrow DR1 direction). The storage cell 7a is composed of a secondary battery such as a nickel hydrogen battery and a lithium ion battery, and has a square shape. The storage cell 7a may use a liquid electrolyte or a solid electrolyte. In order to secure the insulation between the adjacent storage cells 7a, an insulating partition wall 7b is interposed between the adjacent storage cells 7a, if necessary.

The end plate 8a is provided at one end of the power storage module 7 in the arrow DR1 direction, and the end plate 8b is provided at the other end of the power storage module 7 in the arrow DR1 direction. The end plate 8a and the end plate 8b are connected by the restraint bands 9a and 9b, and the power storage module 7 is restrained (pressed and fixed) between the end plate 8a and the end plate 8b.

The heat transfer member 10 has a thin plate-like or sheet-like shape, and is arranged so as to extend in a plane shape on the bottom surface 7c side of each of the plurality of storage cells 7a. The heat transfer member 10 mainly improves the thermal conductivity (for example, adhesion) between the electricity storage module 7 and the cooler 11, and also improves the thermal conductivity (for example, adhesion) between the electricity storage module 7 and the heater 12. It has the function of improving, and the presence of the heat transfer member 10 reduces the thermal resistance between them. The heat transfer member 10 is not an indispensable configuration, and may be used as needed.

The cooler 11 is arranged on the bottom surface 7c side of the power storage module 7 and cools the power storage module 7 (a plurality of power storage cells 7a). The cooler 11 is configured by forming a refrigerant flow path 11a (FIG. 4) inside, for example, an aluminum plate-shaped member, and is located on the side opposite to the power storage module 7 with respect to the heat transfer member 10.

The refrigerant is supplied to the refrigerant flow path 11a, and heat exchange (cooling) is performed between the refrigerant and the plurality of storage cells 7a via the aluminum plate-shaped member. The refrigerant flow path 11a may have a shape extending linearly along the arrow AR1 direction, or may have a shape of a curved pipe meandering and extending along the arrow AR1 direction. good.

The heater 12 is also arranged on the bottom surface 7c side of the power storage module 7 to raise the temperature of the power storage module 7 (plural storage cells 7a). They are arranged adjacent to the cooler 11 in the second direction (arrow DR2 direction), which is a direction orthogonal to both the first direction (arrow AR1 direction) and the vertical direction H. The heater 12 is, for example, a heating wire type heater. For example, the heater 12 raises the temperature of the aluminum plate-shaped member constituting the cooler 11 to indirectly raise the temperature of the power storage module 7 (plurality of power storage cells 7a).

The fixing portion 13 is provided on the side portion 11b (FIG. 4) of the cooler 11 located on the side of the heater 12 in the second direction (arrow DR2 direction) when viewed from the cooler 11. The fixing portion 13 is, for example, a bracket, and has a recess for accommodating the heater 12 inside. As an example, the fixing portion 13 is joined to the side portion 11b of the cooler 11 by means such as welding. It is preferable to cover the upper surface side of the heater 12 with aluminum tape or the like in a state where the heater 12 is arranged inside the fixing portion 13 (recess). The cooler 11 and the heater 12 are integrated with each other via the fixing portion 13. The upper surface position of the heater 12 may not be higher than the upper surface position of the cooler 11.

In the present embodiment, since the heater 12 is sufficiently smaller than the cooler 11, the fixing portion 13 is located on the side of the heater 12 in the second direction (arrow DR2 direction) when viewed from the cooler 11. It is provided on the side portion 11b (FIG. 4) of the vessel 11. The magnitude relationship between the cooler 11 and the heater 12 is not limited to this. For example, depending on the size of the cooler 11 and the heater 12, the fixing portion 13 may be provided on the side portion of the heater 12. That is, the fixing portion 13 may be provided on the side portion of the heater 12 located on the side of the cooler 11 in the second direction (arrow DR2 direction) when viewed from the heater 12, and in this case as well, the cooler 11 and the heater may be provided. 12 is integrated with each other via the fixing portion 13.

The power storage device 5 of the present embodiment further includes an insulating member 14 that integrally covers the entire cooler 11, the fixing portion 13, and the heater 12. The insulating member 14 has, for example, a film shape (a laminated film shape), and protects the entire cooler 11, the fixing portion 13, and the heater 12.

As shown in FIG. 3, the pressing member 15a may be arranged below the cooler 11. The pressing member 15a is composed of a member capable of exerting appropriate elasticity, such as a leaf spring. The pressing member 15a may be made of resin or metal. The pressing member 15a is arranged on the side opposite to the heat transfer member 10 with respect to the cooler 11, and urges the cooler 11 to the side of the heat transfer member 10. The cooler 11 is pressed against the bottom surface 7c of each of the plurality of storage cells 7a via the insulating member 14 and the heat transfer member 10. The upper surface of the heat transfer member 10 is in close contact with the bottom surface 7c of each of the plurality of storage cells 7a. The pressing member 15a having the above configuration is not an essential configuration and may be used as needed.

If necessary, the heater 12 may also be pressed against the bottom surface 7c of each of the plurality of storage cells 7a via the insulating member 14 and the heat transfer member 10. In this case, a part of the heat of the heater 12 is indirectly transferred to the power storage module 7 via the aluminum plate-shaped member constituting the cooler 11 and the heat transfer member 10. In addition to this, the other part of the heat of the heater 12 can be transferred to the power storage module 7 via the heat transfer member 10 without going through the cooler 11. The heater 12 is integrated with the cooler 11 via the fixing portion 13. The pressing force by the pressing member 15a can be indirectly applied to the heater 12 via the cooler 11 and the fixing portion 13. The pressing force by the pressing member 15a may be directly applied to the heater 12.

Hereinafter, the actions and effects of the first embodiment will be described with reference to Comparative Examples 1 and 2 shown in FIGS. 5 and 6, respectively.

(Comparative Examples 1 and 2)
FIG. 5 is a cross-sectional view showing the power storage device 5Y in Comparative Example 1, and corresponds to FIG. 4 in the first embodiment. In the power storage device 5Y, the cooler 11 and the heater 12 are laminated in the vertical direction H. A heater 12 is provided below the cooler 11. When such a configuration is adopted, the height H2 defined by the cooler 11 and the heater 12 tends to be high, and there is room for improvement in terms of space saving.

Unlike the configuration shown in FIG. 5, the cooler 11 is provided below the heater 12, that is, the heater 12 is sandwiched between the bottom surface 7c of the power storage module 7 (storage cell 7a) and the cooler 11. Conceivable. Even in this configuration, the height H2 defined by the cooler 11 and the heater 12 tends to be high, and there is room for improvement in terms of space saving. When such a configuration is adopted, there is a concern that the heater 12 is easily affected by the vibration generated in the power storage module 7, and the heater 12 is easily damaged.

FIG. 6 is a cross-sectional view showing the power storage device 5Z in Comparative Example 2, and corresponds to FIG. 4 in the first embodiment. In the power storage device 5Z, a sheet type heater 16 is used instead of the heater 12 (FIG. 4) in Comparative Example 1. From the upper side to the lower side, the pressing material 15b, the cooler 11 and the sheet type heater 16 are arranged in this order. Even when the sheet type heater 16 is used, the height H3 defined by the cooler 11 and the sheet type heater 16 tends to be high, and there is room for improvement in terms of space saving.

FIG. 7 is a perspective view showing a disassembled state of the sheet type heater 16. The sheet-type heater 16 is configured by, for example, attaching (or sewing) a heating wire-type heater 18 on the sheet 17 and arranging resin covers 19a and 19b on both sides thereof. The resin covers 19a and 19b sandwich the sheet 17 with the heater 18 from both sides.

When the sheet type heater 16 is fixed to the power storage module 7 or the sheet type heater 16 is integrated with the cooler 11, the heater 18 may be damaged due to misalignment or slippage. , 19b. The resin covers 19a and 19b can protect the sheet 17 with the heater 18 from the influence of vibration. However, the presence of the resin covers 19a and 19b causes an increase in body size in the height direction.

As mentioned at the beginning, it is conceivable to arrange the heater 12 on the side of the cooler 11 in order to reduce the influence of vibration and the like. A configuration in which the cooler 11 and the heater 12 are simply arranged side by side (arrow DR2 direction) does not cause an increase in body size in the height direction, but the cooler 11 is provided with a protective insulating member. , It is necessary to separately provide a protective insulating member on the heater 12.

(Action and effect of Embodiment 1)
In the first embodiment, the cooler 11 and the heater 12 are integrated with each other via the fixed portion 13, and the insulating member 14 integrally integrates the cooler 11, the fixed portion 13, and the heater 12. It is covered with. The cooler 11 and the heater 12 are appropriately protected by the insulating member 14. Since the cooler 11 and the heater 12 are insulated from the power storage module 7 by the insulating member 14, the possibility of a short circuit from the power storage module 7 is also reduced.

The power storage device 5 of the first embodiment has a configuration in which the heater 12 is integrally mounted on the cooler 11, and according to the configuration, the height H1 defined by the cooler 11 and the heater 12 (FIG. 4). It is easy to lower the temperature and save space. For example, the height H1 defined by the cooler 11 and the heater 12 is approximately equal to the height of the cooler 11. According to the configuration in which the heater 12 is mounted as an integrated type on the cooler 11, it is possible to save labor in the mounting process. It is not necessary to provide separate insulating members for the cooler 11 and the heater 12 arranged on the bottom surface 7c side of the power storage module 7. Manufacturing costs can also be expected to decrease due to the reduction in the number of parts and man-hours for mounting.

In electric vehicles (EV, HV, PHV, etc.), the power storage device may be mounted on the bottom of the vehicle, and the height direction of the power storage device is reduced to ensure running stability and space in the vehicle interior. It has become a big issue. The power storage device 5 in the first embodiment can meet such a demand.

[Embodiment 2]
FIG. 8 is a cross-sectional view showing the power storage device 5A according to the second embodiment, and corresponds to FIG. 4 according to the first embodiment. The power storage device 5A includes a fixing portion 11c. The fixing portion 11c corresponds to the fixing portion 13 in the first embodiment.

The fixing portion 11c is integrally provided on, for example, an aluminum plate-shaped member constituting the cooler 11 (refrigerant flow path 11a). The fixed portion 11c is also a side portion 11b (more specifically, a side portion 11b) of the cooler 11 located on the side of the heater 12 in the second direction (arrow DR2 direction) when viewed from the cooler 11 (refrigerant flow path 11a). Inside).

It is preferable to cover the upper surface side of the heater 12 with aluminum tape or the like in a state where the heater 12 is arranged inside the fixing portion 11c (recess). The cooler 11 and the heater 12 are integrated with each other via the fixing portion 11c. The upper surface position of the heater 12 may not be higher than the upper surface position of the cooler 11. Even with the power storage device 5A having the above configuration, it is possible to obtain the same operations and effects as those in the first embodiment described above.

[Embodiment 3]
FIG. 9 is a cross-sectional view showing the power storage device 5B according to the third embodiment, and corresponds to FIG. 4 according to the first embodiment. In the power storage device 5B, the cooler 11 has an upper member 11m and a lower member 11n. The fixing portion 13 is provided on the side portion 11d of the cooler 11 located on the side of the heater 12 in the second direction (arrow DR2 direction) when viewed from the cooler 11 (refrigerant flow path 11a) (more specifically). The fixed portion 13 is joined to the lower surface of the side portion 11d).

That is, the technical significance of the "side portion" in the present disclosure is not only the side surface (corresponding to the side portion 11b in the first embodiment) but also a portion located slightly inside in the second direction (arrow DR2 direction) from the side surface. Is also included in the concept of "side". For example, in the second direction (arrow DR2 direction), a portion located outside the refrigerant flow path 11a can be defined as a side portion of the cooler 11.

In the present embodiment, both the fixing portion 13 and the heater 12 are located on the bottom surface side of the side portion 11d of the cooler 11. It is not necessary to cover the upper surface side of the heater 12 with aluminum tape or the like in a state where the heater 12 is arranged inside the fixing portion 13 (recess). Further reduction in manufacturing costs can be expected. The configuration is not limited to that shown in FIG. 9, and the vertical relationship between the side portion 11d and the fixed portion 13 may be the reverse of the configuration shown in FIG. In this case, the fixing portion 13 is arranged on the upper surface of the side portion 11d so as to have a downward U-shape, and the heater 12 is arranged inside the fixing portion 13 so arranged. Even with the power storage device 5B having these configurations, it is possible to obtain the same operations and effects as those of the above-described first and second embodiments.

As described above, the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present invention is indicated by the scope of claims and includes all modifications within the meaning and scope equivalent to the scope of claims.

1 Vehicle body, 2,3 rotary electric machine, 4PCU, 5,5A, 5B, 5Y, 5Z power storage device, 6 cases, 7 power storage module, 7a power storage cell, 7b partition wall, 7c bottom surface, 8a, 8b end plate, 9a, 9b Restraint band, 10 heat transfer member, 11 cooler, 11a refrigerant flow path, 11b, 11d side part, 11c, 13 fixing part, 11m upper member, 11n lower member, 12,18 heater, 14 insulation member, 15a pressing member , 15b presser material, 16 sheet type heater, 17 sheet, 19a, 19b resin cover, 100 vehicles, H vertical direction, H1, H2, H3 height.

Claims (1)

It ’s a power storage device,
A power storage module containing a plurality of power storage cells stacked in the first direction,
A cooler arranged on the bottom surface side of the power storage module to cool the power storage module, and
A heater arranged on the bottom surface side of the power storage module, adjacent to the cooler in a second direction orthogonal to both the first direction and the vertical direction, and raising the temperature of the power storage module.
The side of the cooler located on the side of the heater in the second direction when viewed from the cooler, or the side of the heater located on the side of the cooler in the second direction when viewed from the heater. With a fixed part provided in
The cooler and the heater are integrated with each other via the fixing portion.
The power storage device is
Further comprising an insulating member that integrally covers the entire cooler, the fixing portion and the heater.
Power storage device.

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