Energy storage device

Abstract

In energy storage devices equipped with cooling systems, condensation water forms on the energy storage cells inside the case. [Solution] The energy storage device comprises a housing case 10 for housing energy storage cells 29, a heat exchanger 30 disposed within the housing case 10, and a refrigerant pipe 31 disposed within the housing case 10 and connected to the heat exchanger 30, through which a refrigerant flows, wherein the refrigerant pipe 31 includes a first portion and a second portion 43 that cools the surrounding air more than the first portion.

Description

Technical Field

[0001] This disclosure relates to a power storage device.

Background Art

[0002] Conventionally, various proposals have been made regarding power storage devices. For example, the power storage device described in Japanese Unexamined Patent Application Publication No. 2021-12864 includes a housing, a battery cell assembly disposed within the housing and including a plurality of battery cells, and the above-described refrigerant system. The cooling system includes a cooling plate and a connecting pipe.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above power storage device, when the cooling system is driven, condensed water is generated inside the housing. At this time, the condensed water may also adhere to the surface of the battery cell and may have an adverse effect on the battery cell or the like.

[0005] This disclosure has been made in view of the above problems, and an object thereof is to provide a power storage device in which condensation water is suppressed from condensing on a power storage cell or the like in a case in a power storage device equipped with a cooling system or the like.

Means for Solving the Problems

[0006] The power storage device according to this disclosure includes a housing case that houses a power storage cell, a heat exchanger disposed within the housing case, and a refrigerant pipe that is disposed within the housing case and connected to the heat exchanger and through which a refrigerant flows. The refrigerant pipe includes a first portion and a second portion that cools the surrounding air more than the first portion.

[0007] The refrigerant pipe described above includes a supply pipe through which refrigerant supplied to the heat exchanger flows, and a discharge pipe through which refrigerant discharged from the heat exchanger flows, and the first part is provided in the supply pipe.

[0008] An insulating material is placed on the outer surface of the first part described above, and the outer surface of the second part is exposed inside the housing case.

[0009] The above-mentioned housing case includes a bottom plate and a wall portion formed to extend upward from the bottom plate, the wall portion includes a base portion and a wall body formed to extend upward from the base portion, the base portion is formed to protrude toward the energy storage cell side than the wall body, the refrigerant pipe is positioned above the base portion, and an opening is formed in the base portion in the part located below the refrigerant pipe.

[0010] The above-mentioned housing case includes a partition wall positioned on the energy storage cell side relative to the wall, and the first part is positioned between the partition wall and the wall. A hollow section is formed within the wall, and the opening is formed to communicate with the hollow section.

[0011] The above-mentioned energy storage device further includes a share panel positioned on the bottom surface of the housing case, and an outlet communicating with the hollow section is formed on the bottom surface of the wall, with the outlet being closed by the share panel. [Effects of the Invention]

[0012] According to the energy storage device described herein, it is possible to suppress the condensation of water on energy storage cells and other components inside the case. [Brief explanation of the drawing]

[0013] [Figure 1] This diagram schematically shows a vehicle 1 equipped with an energy storage device 2. [Figure 2] This is an exploded perspective view showing the energy storage device 2. [Figure 3] This is a perspective view showing the energy storage cell 29. [Figure 4] This is a plan view showing the cooling device 12, etc. [Figure 5] It is a perspective view showing the cooling device 12. [Figure 6] It is a cross-sectional view showing the heat exchange plate 32. [Figure 7] It is a cross-sectional view taken along line VII-VII in FIG. 4. [Figure 8] It is a cross-sectional view taken along line VIII-VIII in FIG. 4. [Figure 9] It is a cross-sectional view showing the power storage device 2A. [Figure 10] It is a cross-sectional view showing the power storage device 2B.

Embodiments for Carrying out the Invention

[0014] Embodiments of the present disclosure will be described with reference to the drawings using FIGS. 1 to 10. In the drawings referred to below, the same or corresponding members are given the same reference numerals.

[0015] FIG. 1 is a diagram schematically showing a vehicle 1 on which a power storage device 2 is mounted. The vehicle 1 includes a vehicle body 3, and the power storage device 2 is mounted at the bottom of the vehicle body 3.

[0016] FIG. 2 is an exploded perspective view showing the power storage device 2. In FIG. 2, the width direction W is the width direction of the power storage device 2 and also the vehicle width direction of the vehicle 1. The front-rear direction L is the front-rear direction of the power storage device 2 and also the front-rear direction of the vehicle 1. The up-down direction H is the up-down direction in the vertical direction.

[0017] The power storage device 2 includes a housing case 10, a power storage module 11, a cooling device 12, and an electrical device 13. The housing case 10 includes a lower case 15, an upper case 16, an insulating plate 17, and a shared panel 18.

[0018] The lower case 15 is formed to open upward, and the upper case 16 is provided so as to close the opening of the lower case 15.

[0019] The lower case 15 includes a bottom plate 20, a peripheral wall 21, partition walls 22, 23, and an insulating plate 24.

[0020] The base plate 20 is formed in a plate shape. The peripheral wall 21 is formed along the outer edge of the base plate 20. The peripheral wall 21 includes a side wall 25, a side wall 26, an end plate 27, and an end plate 28.

[0021] The side walls 25 and 26 are arranged in the width direction W, and the side walls 25 and 26 are formed to extend in the front-rear direction L.

[0022] End plates 27 and 28 are provided with a gap in the front-rear direction L, and are formed to extend in the width direction W. End plate 27 connects one end of side wall 25 to one end of side wall 26, and end plate 28 connects one end of side wall 25 to one end of side wall 26.

[0023] Each side wall 25, side wall 26, end plate 27, and end plate 28 is provided with a fixing part, which will be described later, and each fixing part is fixed to the vehicle body 3.

[0024] Partition walls 22 and 23 are located within the area enclosed by the bottom plate 20 and the peripheral wall 21. Partition wall 22 is positioned adjacent to the end plate 27, and is formed to extend in the width direction W.

[0025] The partition wall 23 is positioned with a gap L in the front-to-back direction relative to the end plate 28. The end plate 28 is also formed to extend in the width direction W.

[0026] The end plate 28 is provided with breathable membranes 19A and 19B. Breathable membranes 19A and 19B are waterproof and breathable membranes, and for example, breathable membranes 19A and 19B are made of Gore-Tex or the like.

[0027] The insulating plate 24 is positioned on the upper surface of the bottom plate 20, between the partition walls 22 and 23. The insulating plate 24 has a plurality of openings 24a. The insulating plate 24 is provided with insulating protectors 24b that close these openings 24a.

[0028] The insulating plate 17 is fixed to the lower surface of the bottom plate 20, and multiple openings 17a are also formed in the insulating plate 17.

[0029] Multiple openings 20a are also formed in the base plate 20. The openings 24a, 20a, and 17a are arranged vertically relative to each other.

[0030] The shear panel 18 is positioned below the insulating plate 17, and its outer edge is fixed to the underside of the base plate 20. The shear panel 18 is formed to cover both the insulating plate 17 and the underside of the base plate 20.

[0031] The energy storage module 11 is located on the upper surface of the insulating plate 24. The electrical equipment 13 is located between the partition wall 23 and the end plate 28.

[0032] The energy storage module 11 includes multiple energy storage cells 29. The multiple energy storage cells 29 are arranged with spacing in the front-to-back direction L and with spacing in the width direction W.

[0033] Figure 3 is a perspective view showing a storage cell 29. The storage cell 29 includes a cell case 4 and an electrode body 5 housed within the cell case 4. The cell case 4 includes a bottom plate, and a smoke exhaust valve 6 is formed on the bottom plate of the cell case 4. Each storage cell 29 is arranged such that the smoke exhaust valve 6 is located above the opening 24a of the insulating plate 24 shown in Figure 2.

[0034] Figure 4 is a plan view showing the cooling device 12, etc., and Figure 5 is a perspective view showing the cooling device 12. Note that the energy storage cells 29, etc., are not shown in Figure 5.

[0035] Referring to Figures 4 and 5, the cooling device 12 includes a heat exchanger 30, a refrigerant pipe 31, and an insulating member 40. The heat exchanger 30 includes a plurality of heat exchange plates 32 and a heat exchange plate 33.

[0036] Multiple heat exchange plates 32 are arranged with a gap between them in the front-to-back direction L. Each heat exchange plate 32 is arranged to extend in the width direction W.

[0037] Multiple energy storage cells 29 are arranged in the width direction W between adjacent heat exchange plates 32 in the front-to-back direction L. Figure 6 is a cross-sectional view showing the heat exchange plate 32. As shown in Figure 6, multiple refrigerant passages 32a are formed in the heat exchange plate 32 at intervals in the vertical direction H.

[0038] Returning to Figures 4 and 5, the refrigerant pipe 31 is located inside the housing case 10 and includes a supply pipe 35 and a discharge pipe 36. The refrigerant pipe 31 includes a supply pipe 35 and a discharge pipe 36.

[0039] The supply pipe 35 is connected to the supply section 34A, which is inserted into an insertion hole formed in the end plate 27 and is fixed to the end plate 27.

[0040] The supply pipe 35 includes the main supply pipe 37A, the main supply pipe 37B, and the branch pipes 37C, 37D, and 37E.

[0041] The main supply pipe 37A is positioned between the partition wall 22 and the end plate 27, and is positioned to extend in the width direction W. The main supply pipe 37A is formed to extend toward the side wall 25.

[0042] The main supply pipe 37B is connected to the end of the main supply pipe 37A and is formed to extend in the front-rear direction L along the side wall 25.

[0043] Each of the branch pipes 37C, 37D, and 37E is positioned below the main supply pipe 37B and connected to the main supply pipe 37B. The branch pipes 37C, 37D, and 37E are spaced apart in the front-to-back direction L.

[0044] Furthermore, the connection points between the main supply pipe 37B and each branch pipe 37C, 37D, and 37E are provided with a gap in the front-to-back direction L.

[0045] Multiple heat exchange plates 32, spaced apart in the front-to-back direction L, are connected to branch pipe 37C. Similarly, multiple heat exchange plates 32, spaced apart in the front-to-back direction L, are also connected to branch pipes 37D and 37E.

[0046] A heat exchange plate 33 is connected to the end of the main supply pipe 37B on the end plate 28 side. The heat exchange plate 33 is located on the upper surface of the bottom plate 20, in the portion between the partition wall 23 and the end plate 28. An insulating plate is placed between the heat exchange plate 33 and the bottom plate 20. Electrical equipment 13 is placed on the upper surface of the heat exchange plate 33. The electrical equipment 13 includes, for example, a battery ECU and a junction box.

[0047] The discharge pipe 36 includes a main discharge pipe 38A, a main discharge pipe 38B, and branch pipes 38C, 38D, and 38E.

[0048] The discharge pipe 36 is connected to the discharge section 34B, which is inserted into an insertion hole formed in the end plate 27 and fixed to the end plate 27. The insertion holes 39A and 39B are formed with a gap in the width direction W.

[0049] The main discharge pipe 38A is positioned between the partition wall 22 and the end plate 27, is positioned to extend in the width direction W, and is formed to extend toward the side wall 26.

[0050] The main discharge pipe 38B is connected to the end of the main discharge pipe 38B and is formed to extend along the side wall 26.

[0051] Each branch pipe 38C, 38D, and 38E is positioned below the main supply pipe 38B and connected to the main supply pipe 37B. The branch pipes 38C, 38D, and 38E are spaced apart in the front-to-back direction L.

[0052] Multiple heat exchange plates 32, spaced apart in the front-to-back direction L, are connected to branch pipe 38C. Similarly, multiple heat exchange plates 32, spaced apart in the front-to-back direction L, are also connected to branch pipes 38D and 38E. A heat exchange plate 33 is connected to the end of the main supply pipe 38B on the end plate 28 side.

[0053] The thermal insulation member 40 includes thermal insulation members 40A, 40B, 40C, 40D, and 40E, as well as thermal insulation members 41A, 41B, 41C, 41D, and 41E.

[0054] The insulation member 40A covers a portion of the main supply pipe 37A. On the other hand, a portion of the main supply pipe 37A is exposed from the insulation member 40A.

[0055] Therefore, the main supply pipe 37A has an exposed portion (second portion) 43 that is exposed inside the housing case 10.

[0056] The exposed portion 43 is formed to extend in the width direction W from the connection point with the supply section 34A of the main supply pipe 37A. Furthermore, in the width direction W, the exposed portion 43 extends from the center of the main supply pipe 37A towards the connection point with the main supply pipe 37B.

[0057] The heat insulating member 40A is formed to cover the connection portion between the main supply pipe 37A and the main discharge pipe 38B of the main supply pipe 37A.

[0058] The insulating member 40B covers the main supply pipe 37B. Similarly, the insulating members 40C, 40D, and 40E cover the branch pipes 37C, 37D, and 37E. The insulating members 41A and 41B cover the main discharge pipes 38A and 38B, and the insulating members 41C, 41D, and 41E cover the branch pipes 38C, 38D, and 38E. In this embodiment, the portion of the refrigerant pipe 31 provided with insulating members 40A and 40B corresponds to the "first portion". That is, as the refrigerant C flows through the refrigerant pipe 31, the exposed portion 43 cools the surrounding air more than the portion of the refrigerant pipe 31 provided with insulating members 40A and 40B.

[0059] As shown in Figure 4, a fixing portion 75A is formed on the outer surface of the side wall 25, and similarly, a fixing portion 76A is formed on the outer surface of the side wall 26.

[0060] Fixing portions 77A and 77B are formed on the outer surface of the end plate 27, and fixing portions 78A and 78B are formed on the outer surface of the end plate 28.

[0061] Figure 7 is a cross-sectional view along the line VII-VII in Figure 4. The end plate 27 is formed to extend upward from the outer peripheral edge of the bottom plate 20.

[0062] The insulating plate 17 is fixed to the lower surface of the base plate 20, and the outer edge of the shear panel 18 is fixed to the lower surface of the base plate 20. A sealing member 64 is positioned between the outer edge of the shear panel 18 and the lower surface of the base plate 20.

[0063] The end plate 27 includes the base portion 50 and the wall body 51, and a fixing portion 77A is formed on the outer surface of the end plate 27.

[0064] The base portion 50 is formed on the upper surface of the bottom plate 20. The wall body 51 is formed to extend upward from the base portion 50.

[0065] The base portion 50 is formed to protrude from the wall body 51 towards the energy storage cell 29. A hollow portion 52 is formed within the base portion 50, and multiple hollow portions 53 are also formed in the wall body 51. These multiple hollow portions 53 are arranged in the vertical direction H. A hollow portion 54 is also formed within the fixing portion 77A.

[0066] The fixing portion 77A is fixed to the vehicle body 3 by fastening members 79A and 79B. For example, the vehicle body 3 includes side sills arranged at intervals in the width direction W, cross members 3a connecting the side sills, and a floor panel, and the fixing portion 77A is fixed to the cross members 3a. The fixing portion 77A may also be fixed to the floor panel.

[0067] The partition wall 22 includes a base portion 60 and a wall body 61. The base portion 60 is formed to protrude from the wall body 61 towards the end plate 27. The side of the partition wall 22 on the side facing the energy storage cell 29 is formed as a flat surface.

[0068] Multiple hollow sections 62 are formed within the foundation section 60. Each hollow section 62 is arranged in the front-to-back direction L. Multiple hollow sections 63 are formed within the wall body 61. Each hollow section 63 is arranged in the up-to-down direction H.

[0069] Furthermore, the base portion 60 of the partition wall 22 and the base portion 50 of the end plate 27 are positioned to be in contact with each other. As a result, a recess 90 is formed by the partition wall 22 and the end plate 27, and the main supply pipe 37A is positioned within this recess 90.

[0070] In the cross-section shown in Figure 7, the main supply pipe 37A is not covered by the heat insulating member 40A. That is, Figure 7 shows the exposed portion 43 of the main supply pipe 37A. As shown in Figure 7, the exposed portion 43 is exposed inside the housing case 10. The exposed portion 43 is located inside the recess 90.

[0071] The main supply pipe 37A is positioned above the foundation 60 and the foundation 50. An opening 55 is formed in the foundation 50. The main supply pipe 37A is positioned above the opening 55.

[0072] The opening 55 communicates with the hollow portion 52. The hollow portion 52 is formed to extend in the width direction W. Multiple openings 55 may be formed at intervals in the width direction W, or the opening 55 may be formed to be long in the width direction W.

[0073] The recess 90 is formed to extend in the width direction W, and the opening 55 is formed in the portion located at the bottom of the recess 90.

[0074] Furthermore, an outlet 56 is formed on the bottom surface of the base 50. The outlet 56 communicates with the hollow section 52. The opening of the outlet 56 formed on the bottom surface of the base 50 is closed by a sealing member 64.

[0075] Figure 8 is a cross-sectional view along the line VIII-VIII in Figure 4. The side wall 25 includes a base portion 80 formed on the upper surface of the bottom plate 20 and a wall body 81 extending upward from the base portion 80.

[0076] The base portion 80 is formed to protrude further towards the energy storage cell 29 than the wall body 81. Multiple hollow sections 82 are formed within the foundation section 80, and multiple hollow sections 83 are also formed within the wall body 81. The multiple hollow sections 82 are arranged in the width direction W, and the multiple hollow sections 83 are arranged in the vertical direction H.

[0077] The fixing portion 75A is formed to protrude in the width direction W from the outer surface of the side wall 25, and the fixing portion 75A is fixed to the side sill 3b of the vehicle body 3 by a fastening member 79C. A hollow portion 84 is also formed within the fixing portion 75A.

[0078] In Figure 8, the main supply pipe 37B and the branch pipe 37C are shown. As shown in Figure 8, the outer surface of the main supply pipe 37B is covered with an insulating material 40B. The branch pipe 37C is also covered with an insulating material 40C.

[0079] The energy storage device 2 configured as described above will now be explained. In the energy storage device 2 configured as described above, when the internal pressure inside the containment case 10 rises, the gas inside the containment case 10 is exhausted to the outside through the breathing membranes 19A and 19B. Conversely, when the internal pressure inside the containment case 10 decreases, the gas from outside the containment case 10 enters the containment case 10 through 19A and 19B. At this time, water vapor also enters the containment case 10.

[0080] Then, when the cooling device 12 is activated, the temperature inside the storage case 10 decreases. When the temperature inside the storage case 10 decreases, water vapor inside the storage case 10 condenses.

[0081] Here, the refrigerant pipe 31 of the cooling device 12 includes an exposed portion 43 where the heat insulating member 40 is not provided.

[0082] The exposed portion 43 is exposed inside the housing case 10, and the temperature around the exposed portion 43 tends to be lower. Specifically, the exposed portion 43 cools the surrounding air more than the portion of the refrigerant pipe 31 that is provided with the insulating members 40A and 40B. As a result, condensation is more likely to form on the surface of the exposed portion 43, which can suppress the adhesion of condensation to, for example, the energy storage cell 29.

[0083] By preventing condensation from adhering to the energy storage cell 29, it is possible to prevent problems such as short circuits in the energy storage cell 29.

[0084] In Figure 2, when the energy storage module 11 is cooled, refrigerant C is supplied to the cooling device 12.

[0085] Then, in Figure 3, refrigerant C is supplied from the supply unit 34A to the supply pipe 35. Specifically, refrigerant C is supplied to the main supply pipe 37A. After that, refrigerant C enters the main supply pipe 37B. Then, a portion of the refrigerant C that enters the main supply pipe 37A enters the branch pipes 37C, 37D, and 37E.

[0086] The refrigerant C that enters the branch pipes 37C, 37D, and 37E is supplied to the multiple heat exchange plates 32 connected to the branch pipes 37C, 37D, and 37E.

[0087] The refrigerant C is supplied to multiple heat exchange plates 32, thereby cooling the energy storage cells 29 placed between the heat exchange plates 32. At the same time, the refrigerant C circulating within the heat exchange plates 32 is warmed by the heat from the energy storage cells 29.

[0088] Multiple heat exchange plates 32 are connected to branch pipes 38C, 38D, and 38E, and the refrigerant C heated within the heat exchange plates 32 enters the branch pipes 38C, 38D, and 38E.

[0089] The branch pipes 38C, 38D, and 38E are connected to the main discharge pipe 38A, and the refrigerant C passes through the main discharge pipe 38A and is discharged to the outside of the housing case 10 from the discharge section 34B. The discharge section 34B is connected to a radiator or the like (not shown), and the refrigerant C is cooled by the radiator or the like. The cooled refrigerant C is then supplied back to the supply section 34A.

[0090] Furthermore, a heat exchange plate 33 is connected to the end of the main discharge pipe 38A, and the electrical equipment 13 is cooled by the heat exchange plate 33. The heat exchange plate 33 is connected to the end of the main discharge pipe 38B, and the refrigerant C enters the main discharge pipe 38B.

[0091] In this context, the region within the cooling device 12 where the temperature of the refrigerant C is low is the main supply pipe 37A. As shown in Figure 7, by providing an exposed portion 43 on the main supply pipe 37A, the surface temperature of the exposed portion 43 can be lowered.

[0092] This allows a large amount of condensation to form on the exposed portion 43, preventing the condensation from adhering to the energy storage cell 29 or electrical equipment 13.

[0093] In Figure 7, the exposed portion 43 is located within a recess 90 formed by the partition wall 22 and the end plate 27, with the partition wall 22 positioned between the energy storage cell 29 and the exposed portion 43.

[0094] Therefore, when the air surrounding the exposed portion 43 is cooled, it is more likely to adhere to the inner surface of the recess 90, thus preventing it from adhering to the energy storage cell 29 and the like.

[0095] Then, the condensation that adheres to the surface of the exposed portion 43 and subsequently drips down to the bottom of the recess 90, or adheres to the inner surface of the recess 90, is collected at the bottom of the recess 90.

[0096] An opening 55 is formed at the bottom of the recess 90, and condensed water is discharged into the hollow section 52 through the opening 55. This allows condensed water to be discharged from the space within the housing case 10 where the energy storage cells 29 and electrical equipment 13 are housed.

[0097] Furthermore, since the opening 55 is located below the exposed portion 43, when condensation water adhering to the surface of the exposed portion 43 drips down, it can easily enter the opening 55 and be discharged into the hollow portion 52.

[0098] Furthermore, for example, during maintenance of vehicle 1, the share panel 18 and sealing member 64 can be removed to expose the discharge port 56. This allows condensation water in the hollow section 52 to be discharged to the outside of the housing case 10.

[0099] (Variation 1) A modified example of the energy storage device 2A will now be described. Note that, apart from the shapes of the end plate 27 and the partition wall 22, the configuration of the energy storage device 2A is the same as that of the energy storage device 2 described above. Figure 9 is a cross-sectional view of the energy storage device 2A.

[0100] The energy storage device 2A includes an end plate 27A. The end plate 27A includes a base portion 50A and a wall body 51A.

[0101] The base portion 50A is formed on the upper surface of the bottom plate 20. The wall body 51A is formed to extend upward from the base portion 50A.

[0102] The base section 50A is formed to protrude toward the energy storage cell 29 side from the wall body 51A. A hollow section 52 is formed within the base section 50A, and multiple hollow sections 53 are also formed in the wall body 51. The multiple hollow sections 53 are formed to be arranged in the vertical direction H.

[0103] The upper surface 92 of the base 50A slopes downward in the front-rear direction L as it moves away from the wall body 51A. An opening 55A is formed on the upper surface of the base 50A. The opening 55A also communicates with the hollow section 52. In the energy storage device 2A, the partition wall 22A is formed in the shape of a plate.

[0104] With this energy storage device 2A, condensation water adhering to the wall body 51A, etc., can be guided along the upper surface 92 to the hollow section 52 through the opening 55A. The opening 55A may be formed to be elongated in the width direction W, for example.

[0105] (Modification 2) A modified example 1 of the energy storage device 2B will now be described. Figure 10 is a cross-sectional view showing the energy storage device 2B. In this energy storage device 2B, the configuration is the same as that of the energy storage device 2A, except for the position of the opening.

[0106] An opening 55B is formed in the bottom plate 20 of the energy storage device 2B. The opening 55B is formed adjacent to the base portion 50A in the front-rear direction L. The opening of the opening 55B is located on the lower surface of the bottom plate 20, and a shear panel 18 is positioned below the opening of the opening 55B. Therefore, for example, condensation water adhering to the exposed portion 43 drips down and is guided to the opening 55B via the inclined upper surface 92. It is then discharged from the opening 55B to the outside of the housing case 10. The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims and all modifications in the meaning and scope equivalent to the claims are intended. [Explanation of symbols]

[0107] 1 Vehicle, 2,2A,2B Energy storage device, 3 Vehicle body, 3a Cross member, 3b Side sill, 4 Cell case, 5 Electrode body, 6 Smoke exhaust valve, 10 Housing case, 11 Energy storage module, 12 Cooling device, 13 Electrical equipment, 15 Lower case, 16 Upper case, 17 Insulating plate, 17a,20a,24a,55,55A,55B Opening, 18 Shear panel, 19A,19B Breathing membrane, 20 Bottom plate, 21 Peripheral wall, 22,22A,23 Partition wall, 24 Insulating plate, 24b Insulating protector, 25,26 Side wall, 27,27A,28 End plate, 29 Energy storage cell, 30 Heat exchanger, 31 Refrigerant pipe, 32,33 Heat exchange plate, 32a Refrigerant passage, 34A Supply unit, 34B Discharge section, 35 Supply pipe, 36 Discharge pipe, 37A, 37B Main supply pipe, 37C, 37D, 37E, 38C, 38D, 38E Branch pipe, 38A, 38B Main discharge pipe, 39A, 39B Insertion hole, 40,40A,40B,40C,40D,40E,41A,41B,41C,41D,41E Insulation member, 43 Exposed part.

Claims

1. A housing case for containing energy storage cells, A heat exchanger arranged inside the aforementioned housing case, A refrigerant pipe is located inside the aforementioned housing case and connected to the heat exchanger, through which the refrigerant flows. Equipped with, The refrigerant pipe comprises a first portion and a second portion that cools the surrounding air more than the first portion, in an energy storage device.

2. The aforementioned refrigerant pipe is A supply pipe through which the refrigerant supplied to the heat exchanger flows, A discharge pipe through which the refrigerant discharged from the heat exchanger flows, Includes, The second part is the energy storage device according to claim 1, provided in the supply pipe.

3. An insulating material is placed on the outer surface of the first portion. The energy storage device according to claim 1, wherein the outer surface of the second portion is exposed inside the housing case.

4. The aforementioned storage case includes a bottom plate and a wall portion formed to extend upward from the bottom plate. The aforementioned wall portion includes a base portion and a wall body formed to extend upward from the base portion. The aforementioned base portion is formed to protrude further toward the energy storage cell than the wall body, The refrigerant pipe is positioned above the foundation, The energy storage device according to claim 1, wherein an opening is formed in the base portion at a location below the refrigerant pipe.

5. The housing case includes a partition wall positioned on the energy storage cell side relative to the wall portion, The energy storage device according to claim 4, wherein the second part is disposed between the partition wall and the wall portion.

6. The energy storage device according to claim 4, wherein a hollow portion is formed within the wall portion, and the opening is formed to communicate with the hollow portion.

7. The storage case further comprises a share panel located on the lower surface of the aforementioned storage case, An outlet communicating with the hollow portion is formed on the lower surface of the wall portion. The energy storage device according to claim 6, wherein the discharge port is blocked by the share panel.

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