JP2020087744A - Power storage device - Google Patents

Abstract

To provide a power storage device in which a cooler and a heater disposed on a bottom face side of a power storage module are not required to be provided with separate insulating members, respectively.SOLUTION: A power storage device 5 includes: a power storage module 7 including a plurality of power storage cells 7a stacked in a first direction; a cooler 11 disposed on a bottom face 7c side of the power storage module 7; a heater 12 disposed on the bottom face 7c side of the power storage module 7 and adjacent to the cooler 11 in a second direction DR2 that is a direction orthogonal to both the first direction and a vertical direction; and a stationary part 13. The cooler 11 and the heater 12 are relatively integrated via the stationary part 13, and the power storage device 5 further includes an insulation member 14 that integrally covers the whole of the cooler 11, the stationary part 13 and the heater 12.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a power storage device.

The power storage device includes a power storage module in a case. An electricity storage module is configured by stacking a plurality of electricity storage cells in a predetermined direction. As disclosed in Patent Documents 1 and 2 below, in order to optimize the temperature of a power storage module, that is, a power storage module having a smaller number of stacked power storage cells can be charged and discharged with higher efficiency. Therefore, the power storage device is provided with a cooler and a heater.

JP, 2010-129392, A China utility model publication No. 206947463

Generally, since the positive electrode terminal and the negative electrode terminal are arranged on the upper surface side of the power storage cell, the cooler and the heater are arranged on the bottom surface side of the power storage cell (power storage module). The coolers and heaters disclosed in Patent Documents 1 and 2 are vertically stacked, and the heater is sandwiched between the bottom surface of the electricity 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 possible to arrange 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 on the cooler and separately provide a protective insulating member on the heater.

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

The power storage device includes a power storage module including a plurality of power storage cells stacked in a first direction, a cooler that is disposed on a bottom surface side of the power storage module and cools the power storage module, and a cooler disposed on the bottom surface side of the power storage module. And a heater that is adjacent to the cooler in a second direction that is a direction orthogonal to both the first direction and the vertical direction and that raises the temperature of the power storage module, and the second direction when viewed from the cooler. At a side of the cooler located on the heater side, or a fixing part provided on a side of the heater located on the cooler side in the second direction when viewed from the heater. The cooler and the heater are integrated with each other through the fixing portion, and the power storage device integrally covers the cooler, the fixing portion, and the heater. A member is further provided.

According to the above 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. This is a configuration in which the heater is mounted as an integrated type in the cooler, and according to this 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. A reduction in manufacturing costs can be expected due to a reduction in the number of parts and mounting man-hours.

According to the power storage device of the present disclosure, it is possible to obtain a new 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.

FIG. 2 is a diagram showing a vehicle 100 equipped with power storage device 5 according to the first embodiment. FIG. 3 is a cross-sectional view showing a power storage device 5 in the first embodiment. FIG. 3 is a cross-sectional view showing a power storage device 5 in the first embodiment. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 5 is a cross-sectional view showing a power storage device 5Y in Comparative Example 1. FIG. 7 is a cross-sectional view showing a power storage device 5Z in Comparative Example 2. FIG. 9 is a perspective view showing a disassembled state of a sheet heater 16 included in a power storage device 5Z in Comparative Example 2. FIG. FIG. 7 is a cross-sectional view showing a power storage device 5A in the second embodiment. FIG. 13 is a cross-sectional view showing a power storage device 5B in the third embodiment.

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

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

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

The power storage device 5 according to the present disclosure can be applied to not only hybrid vehicles but also electric vehicles and fuel cell vehicles. Power storage device 5 applied to a hybrid vehicle can be applied to any of a series system, a parallel system, and a series/parallel system. Power storage device 5 is not limited to a hybrid vehicle provided with two rotary electric machines, but can 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 that 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 that appears when the power storage device 5 is virtually cut by a cross section parallel to the vertical direction. FIG. 4 is a 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, restraining bands 9a and 9b (FIG. 2), a heat transfer member 10 (FIGS. 3 and 4), The cooling device 11, the heater 12, the fixing portion 13 (FIG. 4), and the insulating member 14 (FIG. 4) are provided.

The electricity 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 electricity storage cell 7a is composed of a secondary battery such as a nickel hydrogen battery and a lithium ion battery, and has a rectangular shape. The electricity storage cell 7a may use a liquid electrolyte or may use a solid electrolyte. In order to ensure insulation between the adjacent power storage cells 7a, a partition wall 7b for insulation is interposed between the adjacent power storage cells 7a as necessary.

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

The heat transfer member 10 has a thin plate shape or a sheet shape, and is arranged so as to extend in a planar shape on the bottom surface 7c side of each of the plurality of power 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. The heat transfer member 10 has the function of improving the heat resistance, and the heat resistance between them is reduced by the presence of the heat transfer member 10. The heat transfer member 10 is not an essential component 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 11 a (FIG. 4) inside a plate-shaped member made of aluminum, for example, and is located on the opposite side of the heat transfer member 10 from the power storage module 7.

Refrigerant is supplied to the refrigerant passage 11a, and heat exchange (cooling) is performed between the refrigerant and the plurality of power storage cells 7a via the aluminum plate member. The coolant channel 11a may have a shape that linearly extends along the arrow AR1 direction, or may have a shape of a curved tube that extends while meandering along the arrow AR1 direction. Good.

The heater 12 is also arranged on the bottom surface 7c side of the electricity storage module 7 and raises the temperature of the electricity storage module 7 (the plurality of electricity storage cells 7a). It is arranged so as to be adjacent to the cooler 11 in a 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. The heater 12 indirectly raises the temperature of the electricity storage module 7 (the plurality of electricity storage cells 7a) by raising the temperature of the aluminum plate-shaped member that constitutes the cooler 11, for example.

The fixing portion 13 is provided on the side portion 11b (FIG. 4) of the cooler 11 located on the heater 12 side 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 fixed portion 13 is joined to the side portion 11b of the cooler 11 by means such as welding. It is advisable 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 heater 12 side 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 container 11. The size relationship between the cooler 11 and the heater 12 is not limited to this. For example, depending on the sizes 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 fixed portion 13 may be provided on the side portion of the heater 12 located on the cooler 11 side 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 12 and 12 are integrated with each other via a fixing portion 13.

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

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

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

Hereinafter, the operation and effect of the above-described 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 power storage device 5Y in Comparative Example 1, and corresponds to FIG. 4 in the first embodiment. In power storage device 5Y, cooler 11 and heater 12 are stacked in vertical direction H. A heater 12 is provided below the cooler 11. If 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 (power storage cell 7a) and the cooler 11. Conceivable. Also 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 power storage device 5Z in Comparative Example 2, and corresponds to FIG. 4 in the first embodiment. In power storage device 5Z, sheet-type heater 16 is used instead of heater 12 (FIG. 4) in Comparative Example 1. The pressing member 15b, the cooler 11, and the sheet-type heater 16 are arranged in this order from above to below. Even when the sheet heater 16 is used, the height H3 defined by the cooler 11 and the sheet 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 heater 16. The sheet-type heater 16 is configured, for example, by attaching (or sewing) a heating wire-type heater 18 on the sheet 17 and disposing resin covers 19a and 19b on both sides of the heater. The resin covers 19a and 19b sandwich the seat 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 rubbing. , 19b. The resin covers 19a and 19b can protect the seat 17 with the heater 18 also from the influence of vibration. However, the presence of the resin covers 19a and 19b leads to an increase in body size in the height direction.

As described 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. Although a configuration in which the cooler 11 and the heater 12 are simply arranged side by side (in the direction of the arrow DR2) suppresses an increase in body size in the height direction, the cooler 11 is provided with a protective insulating member. It is necessary to separately provide a protective insulating member also on the heater 12.

(Operation and effect of the first embodiment)
In the first embodiment, the cooler 11 and the heater 12 are integrated with each other via the fixing portion 13, and the insulating member 14 integrally includes the cooler 11, the fixing portion 13, and the heater 12. Is covered. The cooler 11 and the heater 12 are appropriately protected by the insulating member 14. Since the insulating member 14 insulates the cooler 11 and the heater 12 from the power storage module 7, the possibility of a short circuit from the power storage module 7 is 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). Can be lowered easily, and space can be saved. For example, the height H1 defined by the cooler 11 and the heater 12 is substantially equal to the height of the cooler 11. According to the configuration in which the heater 12 is mounted on the cooler 11 as an integrated type, labor saving in the mounting process can be achieved. 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 electricity storage module 7. A reduction in manufacturing costs can be expected due to a reduction in the number of parts and mounting man-hours.

In an electric vehicle (EV, HV, PHV, etc.), a power storage device may be mounted on the bottom surface of the vehicle or the like, and the height direction of the power storage device may be reduced in order to secure traveling stability and space in the vehicle interior. It is a big issue. Power storage device 5 in the first embodiment can meet such a demand.

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

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

It is advisable 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 power storage device 5A having the above-described configuration, it is possible to obtain the same operation and effect as in the above-described first embodiment.

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

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

In the present embodiment, both fixing part 13 and heater 12 are located on the bottom surface side of side part 11d of 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 cost 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 fixed 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 fixed portion 13 thus arranged. Even with power storage device 5B having these configurations, it is possible to obtain the same actions and effects as those of the above-described first and second embodiments.

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

1 vehicle body, 2, 3 rotating electric machine, 4 PCU, 5, 5A, 5B, 5Y, 5Z power storage device, 6 case, 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 Fixed part, 11m Upper member, 11n Lower member, 12, 18 Heater, 14 Insulating member, 15a Pressing member , 15b Pushing material, 16 seat type heater, 17 seats, 19a, 19b Resin cover, 100 vehicle, H vertical direction, H1, H2, H3 height.

Claims (1)

A power storage device,
An electricity storage module including a plurality of electricity storage cells stacked in a first direction;
A cooler that is disposed on the bottom surface side of the power storage module and cools the power storage module,
A heater disposed on the bottom surface side of the electricity storage module, adjacent to the cooler in a second direction that is a direction orthogonal to both the first direction and the vertical direction, and a heater for raising the temperature of the electricity storage module;
The side portion of the cooler located on the heater side in the second direction when viewed from the cooler, or the side portion of the heater located on the cooler side in the second direction when viewed from the heater. A fixed part provided in
The cooler and the heater are integrated with each other via the fixing portion,
The power storage device is
An insulating member, which integrally covers the entire cooler, the fixing portion, and the heater,
Power storage device.

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