power storage device

Abstract

The present application has an object to suppress breakage of an insulating film and effectively release heat of a battery cell to the outside of the battery cell. An electricity storage device includes a battery cell, an insulating film, a bottom portion, a protection member, and a heat conducting member. The insulating film includes a side surface portion and a bottom surface portion. The side surface portion covers a side surface of the battery cell. The bottom surface portion covers a bottom surface of the battery cell. The bottom portion is located below the bottom surface portion. The protection member is partially provided on the bottom surface portion. The heat conducting member is in contact with both the bottom surface portion and the bottom portion.

Description

Technical Field

[0001] This invention relates to an energy storage device. Background Technology

[0002] Patent document 1 (Japanese Patent No. 6955112) discloses a battery pack as a conventional energy storage device. In this battery pack, the lower surface of an insulating layer disposed on the bottom surface of the battery cell is in contact with the upper surface of a heat-conducting sheet. The insulating layer is formed, for example, from a film or coating having electrical insulating properties.

[0003] Patent Document 1: Japanese Patent No. 6955112 Summary of the Invention

[0004] In conventional energy storage devices, to facilitate heat dissipation from the battery cells, the insulating layer is preferably a relatively thin insulating film. However, the thinner the insulating film, the more easily it breaks. Therefore, it is also possible to further cover the insulating film with protective components. However, it may be difficult to dissipate the heat of the battery cells to the outside through the protective components.

[0005] The present invention was made in view of the above-mentioned problems, and its object is to provide an energy storage device that can suppress the rupture of the insulating film and effectively release the heat of the battery cell to the outside of the battery cell.

[0006] An energy storage device according to one aspect of the present invention includes: a battery cell; an insulating film; a bottom; a protective member; and a heat-conducting member. The insulating film includes a side portion and a bottom portion. The side portion covers the side surface of the battery cell. The bottom portion covers the bottom surface of the battery cell. The bottom is located below the bottom portion. The protective member is partially disposed on the bottom portion. The heat-conducting member is in contact with both the bottom portion and the bottom.

[0007] Invention Effects

[0008] According to the present invention, it is possible to suppress the rupture of the insulating film and to effectively release the heat of the battery cell to the outside of the battery cell. Attached Figure Description

[0009] Figure 1 This is a cross-sectional view showing an energy storage device according to an embodiment of the present invention.

[0010] Figure 2 This is a cross-sectional view schematically illustrating a method of placing a heat-conducting component between the battery cell and the bottom. Detailed Implementation

[0011] Hereinafter, an energy storage device according to an embodiment of the present invention will be described with reference to the accompanying drawings. The same or corresponding parts in the drawings will be labeled with the same symbols, and their descriptions will not be repeated. Furthermore, the symbols “U” and “D” are shown in the drawings to indicate the direction used to explain the structure of the energy storage device. “U” indicates upward, and “D” indicates downward.

[0012] Figure 1 This is a cross-sectional view showing an energy storage device according to an embodiment of the present invention. Figure 1 The energy storage device 1 shown can be installed in electric vehicles such as plug-in hybrid electric vehicles (PHEVs) or battery electric vehicles (BEVs). The energy storage device 1 can supply electricity for driving the vehicle.

[0013] like Figure 1 As shown, the energy storage device 1 includes a battery cell 10, an insulating film 20, a bottom 30, a protective component 40, a second protective component 50, and a heat-conducting component 60. The energy storage device 1 may include a battery module. The battery module may include the battery cell 10 and multiple other battery cells (not shown).

[0014] Examples of battery cells 10 include secondary batteries such as lithium-ion batteries, nickel-metal hydride batteries, or sodium-ion batteries. The type of secondary battery can be a liquid-cooled secondary battery or a fully solid-state secondary battery. Battery cell 10 includes, for example, electrode bodies and a battery cell housing (neither shown). Battery cell 10 (battery cell housing) can be generally rectangular (so-called square) or generally cylindrical (so-called cylindrical). The side surfaces 11 of battery cell 10 extend in the vertical direction. The bottom surface 12 of battery cell 10 extends in a direction orthogonal to the vertical direction.

[0015] The insulating film 20 is electrically insulating. The insulating film 20 is provided to prevent short circuits between the battery cell 10 and other components (such as other battery cells). The insulating film 20 includes a side portion 21 and a bottom portion 22. The side portion 21 covers the side portion 11 of the battery cell 10. The side portion 21 can be arranged to surround the battery cell 10 when viewed from above.

[0016] The bottom portion 22 covers the bottom surface 12 of the battery cell 10. The bottom portion 22 is connected to the side portion 21. The side portion 21 and the bottom portion 22 can be formed of different materials, but in this embodiment, the insulating film 20 is formed of an integral component. The insulating film 20 can be formed from a single sheet of film.

[0017] The bottom portion 30 is located below the bottom portion 22. The bottom portion 30 includes a lower plate portion 31, a cooler 32, and a heat-conducting layer 33. The lower plate portion 31 is in contact with the heat-conducting component 60. The lower plate portion 31 may be part of a housing or package that houses the battery unit 10 (including the battery module of the battery unit 10). Specifically, the lower plate portion 31 may be part of a so-called lower housing that opens upwards. The lower plate portion 31 covers the entire battery unit 10 below it.

[0018] The cooler 32 is internally configured to allow the flow of a refrigerant consisting of a liquid such as water or oil, or a gas such as air. The cooler 32 is located below the lower plate portion 31.

[0019] A heat-conducting layer 33 is disposed between the cooler 32 and the lower plate 31. The heat-conducting layer 33 can be a cured adhesive used to bond the cooler 32 and the lower plate 31 together, or it can be a sheet-like component.

[0020] The protective component 40 is partially disposed on the bottom surface 22. The protective component 40 has higher rigidity than the heat-conducting component 60. The protective component 40 can be a sheet-like component. The thickness (vertical dimension) of the protective component 40 is greater than the thickness (vertical dimension) of the bottom surface 22.

[0021] The second protective component 50 is partially disposed on the bottom surface 22. The second protective component 50 is spaced apart from the protective component 40. The second protective component 50 has higher rigidity than the heat-conducting component 60. The second protective component 50 can be a sheet-like component. The second protective component 50 can be made of the same material as the protective component 40. The second protective component 50 can be the same component as the protective component 40. The thickness (vertical dimension) of the second protective component 50 is greater than the thickness of the bottom surface 22. The thickness of the second protective component 50 is the same as the thickness of the protective component 40.

[0022] The thermally conductive component 60 contacts both the bottom portion 22 and the bottom portion 30. The thermally conductive component 60 covers the entire bottom portion 22 between the protective component 40 and the second protective component 50. The thermally conductive component 60 is located between the protective component 40 and the bottom portion 30. The thermally conductive component 60 contacts the lower surface of the protective component 40. The thermally conductive component 60 is located between the second protective component 50 and the bottom portion 30. The thermally conductive component 60 contacts the lower surface of the second protective component 50. The thermally conductive component 60 has a higher thermal conductivity than both the protective component 40 and the second protective component 50. The thermally conductive component 60 is a cured adhesive. The thermally conductive component 60 can be formed from the same component as the thermally conductive layer 33.

[0023] As described above, an embodiment of the present invention includes a battery cell 10, an insulating film 20, a bottom 30, a protective member 40, and a heat-conducting member 60. The insulating film 20 includes a side portion 21 and a bottom portion 22. The side portion 21 covers the side portion 11 of the battery cell 10. The bottom portion 22 covers the bottom surface 12 of the battery cell 10. The bottom 30 is located below the bottom portion 22. The protective member 40 is partially disposed on the bottom portion 22. The heat-conducting member 60 is in contact with both the bottom portion 22 and the bottom 30.

[0024] According to the above structure, the bottom surface 22 of the insulating film 20 is protected by the protective member 40, and the heat of the battery cell 10 can be effectively released from the bottom surface 22 on the bottom surface 12 of the battery cell 10 to the bottom 30 through the heat-conducting member 60. Therefore, the breakage of the insulating film 20 can be suppressed, and the heat of the battery cell 10 can be effectively released to the outside of the battery cell 10.

[0025] Furthermore, in this embodiment, the protective component 40 has higher rigidity than the heat-conducting component 60. The heat-conducting component 60 has higher thermal conductivity than the protective component 40.

[0026] According to the above structure, the protective effect of the insulating film 20 based on the protective component 40 can be further improved, and the heat dissipation effect of the battery cell 10 based on the heat-conducting component 60 can be further improved.

[0027] Furthermore, in this embodiment, the heat-conducting component 60 is located between the protective component 40 and the bottom 30, and is in contact with the lower surface of the protective component 40. The heat-conducting component 60 is a cured adhesive.

[0028] Figure 2 This is a cross-sectional view schematically illustrating a method of placing a heat-conducting component between the battery cell and the bottom. Based on the above structure, as... Figure 2 As shown, the adhesive applied to the bottom 30 is held by the protective component 40 and the bottom 30. Figure 2 (Indicated by the symbol "60A"), the adhesive also spreads between the bottom face 22 and the bottom 30. Figure 2 In the diagram, the relative movement of the protective component 40 with respect to the bottom 30 is indicated by a hollow arrow, and the diffusion direction of the adhesive is indicated by a thick black arrow. The protective component 40 has relatively high rigidity, thus allowing the adhesive to be easily pressed. Furthermore, by curing the adhesive to form the thermally conductive component 60, the thermally conductive component 60 can be easily positioned at the desired location.

[0029] Furthermore, in this embodiment, the energy storage device 1 also includes a second protective member 50. The second protective member 50 is disposed on the bottom surface 22 and is spaced apart from the protective member 40. The heat-conducting member 60 is located between the second protective member 50 and the bottom 30, contacts the lower surface of the second protective member 50, and covers the entire bottom surface 22 between the protective member 40 and the second protective member 50.

[0030] According to the above structure, the battery cell 10 covered by the insulating film 20 is more stably supported on the bottom 30 by the protective member 40 and the second protective member 50, and the contact area between the bottom part 22 and the bottom 30 can be ensured. Furthermore, as... Figure 2 As shown, this structure can be relatively easily achieved by clamping an adhesive with the protective member 40 and the bottom 30, and clamping another adhesive separated from the adhesive with the second protective member 50 and the bottom 30.

[0031] Furthermore, in this embodiment, the bottom 30 includes a lower plate portion 31, a cooler 32, and a heat-conducting layer 33. The lower plate portion 31 is in contact with the heat-conducting component 60. The cooler 32 is disposed below the lower plate portion 31. The heat-conducting layer 33 is disposed between the cooler 32 and the lower plate portion 31.

[0032] According to the above structure, by directly providing the heat-conducting component 60 on the lower plate portion 31, which has relatively high rigidity, the battery cell 10 can be stably disposed within the energy storage device 1. Furthermore, the heat from the battery cell 10 can be dissipated more efficiently by the cooler 32.

[0033] In the description of the above embodiments, the combinable structures can be combined with each other.

[0034] It should be considered that the embodiments disclosed herein are illustrative in all respects and not restrictive. The scope of the invention is not shown in the foregoing description, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0035] Symbol Explanation

[0036] 1-Energy storage device, 10-Battery unit, 11-Side, 12-Bottom, 20-Insulating film, 21-Side part, 22-Bottom part, 30-Bottom, 31-Lower plate, 32-Cooler, 33-Heat-conducting layer, 40-Protective component, 50-Second protective component, 60-Heat-conducting component.

Claims

1. An energy storage device, characterized in that, have: Battery cell; Insulating film; bottom; Protective components; and Thermal conductive components The insulating film includes a side portion and a bottom portion. The side portion covers the side of the battery cell. The bottom surface covers the bottom surface of the battery cell. The bottom is located below the bottom surface. The protective component is partially disposed on the bottom surface. The heat-conducting component is in contact with both the bottom surface and the bottom.

2. The energy storage device according to claim 1, characterized in that, The protective component has higher rigidity compared to the heat-conducting component. The thermally conductive component has higher thermal conductivity than the protective component.

3. The energy storage device according to claim 1 or 2, characterized in that, The heat-conducting component is located between the protective component and the bottom, and is in contact with the lower surface of the protective component. The thermally conductive component is a cured adhesive.

4. The energy storage device according to claim 3, characterized in that, It also has a second protective component. The second protective component is disposed on the bottom surface and is spaced apart from the first protective component. The heat-conducting component is located between the second protective component and the bottom, and contacts the lower surface of the second protective component, covering the entire bottom surface between the protective component and the second protective component.

5. The energy storage device according to claim 1, characterized in that, The bottom includes a lower plate, a cooler, and a heat-conducting layer. The lower plate portion is in contact with the heat-conducting component. The cooler is located below the lower plate. The heat-conducting layer is disposed between the cooler and the lower plate.

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