Power storage device structure

Abstract

To provide a power storage device structure capable of cooling a detachable battery with a simpler configuration in a vehicle equipped with the detachable battery.SOLUTION: A power storage device structure 10 includes: a detachable power storage device 11; and a case 21 having a first part 22 in contact with the power storage device 11 and a second part which is a part of the part excluding at least the first part 22, and houses the power storage device 11 inside. The first part 22 has a higher thermal conductivity than the second part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electricity storage device structure. [Background technology]

[0002] Patent Document 1 discloses a cooling control unit that controls a cooling mechanism of a battery unit that is detachable from a mobile object. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-39705 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is a need for a simpler configuration for cooling a removable battery in a vehicle equipped with the removable battery. [Means for solving the problem]

[0005] In one embodiment of the electricity storage device structure, the thermal conductivity of the housing member that comes into contact with the casing of the detachable battery is increased. [Effects of the Invention]

[0006] According to the power storage device structure of the present disclosure, in a vehicle equipped with a removable battery, the removable battery can be cooled with a simpler configuration. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a cross-sectional view showing an example of a structure of an electricity storage device according to a first embodiment. [Figure 2] 1 is a cross-sectional view showing an example of a vehicle equipped with an electricity storage device structure according to a first embodiment. [Figure 3]1 is a cross-sectional view showing an example of a structure of an electricity storage device according to a first embodiment. [Figure 4] 1 is a cross-sectional view showing an example of a structure of an electricity storage device according to a first embodiment. [Figure 5] FIG. 10 is a perspective view showing an example of a structure of an electricity storage device according to a second embodiment. [Figure 6] FIG. 10 is a cross-sectional view showing an example of a structure of an electricity storage device according to a second embodiment. [Figure 7] FIG. 11 is a cross-sectional view showing an example of a structure of an electricity storage device according to a third embodiment. [Figure 8] FIG. 10 is a perspective view showing an example of a structure of an electricity storage device according to a fourth embodiment. [Figure 9] FIG. 10 is a cross-sectional view showing an example of a structure of an electricity storage device according to a fourth embodiment. [Figure 10] FIG. 11 is a perspective view showing an example of a holding structure of an electricity storage device according to a fourth embodiment. [Figure 11] FIG. 10 is a cross-sectional view showing an example of a structure of an electricity storage device according to a fifth embodiment. [Figure 12] FIG. 10 is a cross-sectional view showing an example of a structure of an electricity storage device according to a fifth embodiment. [Figure 13] FIG. 10 is a cross-sectional view showing an example of a structure of an electricity storage device according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (Embodiment 1) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Fig. 1 is a cross-sectional view showing an example of a structure of an electricity storage device according to a first embodiment.

[0009] 1, the energy storage device structure 10 includes a detachable battery pack 11, a battery pack housing 21, a cooling plate 22, and a cooling structure 23. The detachable battery pack 11 includes battery cells 12, a thermal conductor 13, and a cooling plate 14.

[0010] The battery cell 12 is a battery cell that can store electricity.

[0011] The thermal conductor 13 is in contact with the battery cells 12. The thermal conductor 13 then conducts the heat generated by the battery cells 12 to the cooling plate 14.

[0012] The cooling plate 14 is a plate that is in contact with the thermal conductor 13. The cooling plate 14 is located on the surface of the detachable battery pack 11, and conducts the heat generated by the battery cells 12 to the outside.

[0013] The battery pack storage section 21 is a case that can store the detachable battery pack 11.

[0014] Cooling plate 22 constitutes a part of the case of battery pack accommodating section 21. If cooling plate 22 is defined as a first part of battery pack accommodating section 21, the first part has a higher thermal conductivity than a second part, which is a part of the part excluding cooling plate 22.

[0015] The cooling structure 23 is a part that dissipates heat. The cooling structure 23 may be a liquid-cooled structure or an air-cooled structure as long as it is capable of dissipating heat.

[0016] With the above configuration, the cooling plate 22 is also provided in the battery pack storage section 21, and heat can be drawn to the cooling structure 23 via the cooling plate 22 as shown by the arrow in FIG.

[0017] 2 is a cross-sectional view showing an example of a vehicle equipped with the power storage device structure according to the first embodiment. Examples of the power storage device structure 10 that can be equipped with the vehicle 24 include power storage device structures 10-1, 10-2, and 10-3. When the power storage device structure 10-1 is disposed, when the detachable battery pack 11 generates heat, the heat is transferred to the cooling structure equipped with the vehicle via the cooling plates 22 and 23 of the detachable battery pack 11.

[0018] In addition, when the electric storage device is disposed at the position of the electric storage device structure 10-2 or 10-3, the structure may be such that when the electric storage device is mounted on the bottom surface of the vehicle, the cooling plate 22 is exposed to the wind when the vehicle is running, thereby dissipating heat.

[0019] As described above, according to the electricity storage device structure of the first embodiment, by using a metal material with a good heat transfer rate for the cooling plate, heat can be transferred efficiently from the cells to the cooling structure.

[0020] In the electricity storage device structure of FIG. 1, heat is dissipated from the lower surface of the electricity storage device structure 10, but heat may be dissipated from a portion other than the lower surface of the electricity storage device structure 10.

[0021] Fig. 3 is a cross-sectional view showing an example of the electricity storage device structure according to embodiment 1. In the electricity storage device structure of Fig. 3, the direction of gravity is downward, and heat is dissipated from the side surfaces of the electricity storage device structure 10.

[0022] Fig. 4 is a cross-sectional view showing an example of the electricity storage device structure according to embodiment 1. In the electricity storage device structure of Fig. 4, the direction of gravity is downward, and heat is dissipated on the upper surface of the electricity storage device structure 10.

[0023] For example, when a battery pack is slid while a load is applied in the direction of gravity, the cooling plates rub against each other, causing wear. However, with the energy storage device structures shown in Figures 3 and 4, there is no variation in heat transfer performance due to wear of the cooling plates.

[0024] Furthermore, when replacing a battery pack, it can be difficult to ensure sufficient contact area because the degree of wear varies depending on the battery pack. However, the energy storage device structures of Figures 3 and 4 make it possible to ensure the contact area required for the cooling plates to establish a heat transfer path.

[0025] (Embodiment 2) In the second embodiment, a structure for attaching and detaching a detachable battery pack to and from a power storage device structure will be described. Fig. 5 is a perspective view showing an example of a power storage device structure according to the second embodiment. Fig. 6 is a cross-sectional view showing an example of a power storage device structure according to the second embodiment. In Figs. 5 and 6, a power storage device structure 30 includes a rib structure 15, a rail structure 31, wheels 32, and a spring structure 41 in addition to the configuration of the power storage device structure 10 in Fig. 1. The same components as those in Fig. 1 are assigned the same numbers, and descriptions thereof will be omitted.

[0026] The rail structure 31 is provided on the wall surface facing the cooling plate 22 of the battery pack housing section 21, and serves as a guide when inserting the removable battery pack 11. The rail structure 31 is set in the insertion direction of the removable battery pack 11, and includes wheels 32 that reduce friction with the battery pack.

[0027] The spring structure 41 is an elastic body that applies a load in a direction that presses the cooling plate 14 of the detachable battery pack 11 from the rail structure 31 .

[0028] The rib structure 15 is a groove provided on the surface of the detachable battery pack 11. The rib structure 15 of the detachable battery pack 11 fits onto the wheels 32 of the rail structure 31.

[0029] Thus, according to the energy storage device structure of embodiment 2, by providing a configuration for pressing the detachable energy storage device against the cooler after insertion, the contact between cooling plate 14, which is the first part of detachable battery pack 11, and cooling plate 22 is improved, thereby improving cooling performance.

[0030] (Embodiment 3) Fig. 7 is a cross-sectional view showing an example of an electricity storage device structure according to embodiment 3. In Fig. 7, an electricity storage device structure 30 includes a swipe structure 51, a swipe structure 52, and a foreign object discharge port 53 in addition to the components of the electricity storage device structure 10 in Fig. 1. The same components as those in Fig. 1 are assigned the same numbers, and descriptions thereof will be omitted.

[0031] The swipe structure 51 is a structure for wiping off foreign matter, provided at the insertion start end of the cooling plate 14 mounting surface of the detachable battery pack 11. For example, the swipe structure 51 is a protruding rubber. When the detachable battery pack 11 slides into the battery pack housing 21, the swipe structure 51 wipes off foreign matter adhering to the surface of the detachable battery pack 11 and expels the foreign matter through the foreign matter discharge port 53.

[0032] The swipe structure 52 is a structure for wiping away foreign matter, provided at the insertion start end of the cooling plate 22 mounting surface of the battery pack housing portion 21. For example, the swipe structure 52 is a protruding rubber. When the detachable battery pack 11 slides into the battery pack housing portion 21, the swipe structure 52 wipes away foreign matter adhering to the inner surface of the battery pack housing portion 21.

[0033] The foreign object discharge port 53 is an opening provided in the battery pack housing portion 21. The swiped foreign object is discharged to the outside of the battery pack housing portion 21 through the foreign object discharge port 53.

[0034] As described above, according to the energy storage device structure of the third embodiment, foreign matter adhering to the cooling plate of the battery pack housing section can be removed by the swipe structure when the battery pack is inserted. Similarly, foreign matter adhering to the battery pack housing section can be removed by the swipe structure of the battery pack. After swiping the foreign matter, it can be expelled from the battery pack housing area. As a result, according to the energy storage device structure of the third embodiment, cooling performance can be ensured because foreign matter is not trapped.

[0035] (Fourth embodiment) Fig. 8 is a perspective view showing an example of a power storage device structure according to the fourth embodiment. Fig. 9 is a cross-sectional view showing an example of a power storage device structure according to the fourth embodiment. Fig. 10 is a perspective view showing an example of a holding structure of the power storage device structure according to the fourth embodiment.

[0036] 8 to 10, an electricity storage device structure 60 includes a pressing structure 61, a lever interlocking structure 62, a fixing portion 63, a spring 64, a spring 65, a fitting lever 71, a male connector 72, and a female connector 73 in addition to the components of the electricity storage device structure 10 in Fig. 1. The same components as those in Fig. 1 are assigned the same numbers and will not be described.

[0037] The retaining structure 61 is also integrated with a rail structure that serves as a guide when inserting the battery pack, and when the detachable battery pack 11 is inserted, the rail structure is positioned to protrude further than the cooling plate 22 of the battery pack housing section 21. In conjunction with the displacement of the retaining structure 61 when the fitting lever is operated, the rail is displaced to a position retracted from the cooling plate, allowing the cooling plates to come into contact with each other.

[0038] The lever interlocking structure 62 is a structure that moves simultaneously with the lever fitting operation and presses down on the battery pack in conjunction with the battery pack fitting lever 71. Specifically, the lever interlocking structure 62 applies a load by pressing the cooling plate 14 of the detachable battery pack 11 against the cooling plate 22 of the battery pack housing section 21 using the principle of leverage, with the sliding action of the fitting lever 71 as the force point and the fixed part 63 as the fulcrum.

[0039] The lever interlocking structure 62 is a structure that applies a load by pressing the cooling plate 14 against the cooling plate 22 of the battery pack accommodating section 21. The lever interlocking structure 62 is also provided with a spring 64, which can apply a load to the holding structure 61 in proportion to the displacement of the lever interlocking structure 62.

[0040] The spring 64 is disposed at a location where the lever interlocking structure 62 and the pressing structure 61 come into contact. The spring 64 applies a force to the pressing structure 61 in a direction that moves the cooling plate 22 of the battery pack accommodating section 21 away from the detachable battery pack 11.

[0041] Spring 65 is a spring disposed below the rail structure of retaining structure 61. When fitting lever 71 is detached to remove the battery pack and the load on lever interlocking structure 62 is released, the rail structure protrudes beyond cooling plate 22 due to the reaction force of spring 65, and detachable battery pack 11 slides in contact with the rail structure.

[0042] The mating lever 71 is a lever with a slide lock structure that lets the operator know that the connectors are fully mated and secures the battery pack. As shown in Figure 9, the lever interlocking structure 62 is provided to apply a load by pressing the cooling plate 14 of the detachable battery pack 11 against the cooling plate 22 of the battery pack housing section 21 using the principle of leverage, with the sliding operation of the mating lever 71 as the force point and the fixing section 63 as the fulcrum.

[0043] The male connector 72 is a connector mounted on the top surface of the detachable battery pack 11 for making an electrical connection when the battery pack is inserted.

[0044] The female connector 73 is a connector that is installed on the top of the battery pack receiving section 21 to establish an electrical connection when the battery pack is inserted.

[0045] When the battery pack is inserted, the male connector 72 and the female connector 73 are mated to establish an electrical connection.

[0046] Thus, according to the electricity storage device structure of the fourth embodiment, the cooling plates do not come into contact with each other when the battery pack is slid to be attached or detached, so there is little concern about wear on the cooling plates.

[0047] (Embodiment 5) 11 and 12 are cross-sectional views showing an example of an electricity storage device structure according to embodiment 5. In Figs. 11 and 12, an electricity storage device structure 70 includes a gear 66 in addition to the components of the electricity storage device structure 10 in Fig. 1 and the electricity storage device structure 60 in Figs. 8 to 10. The same components as those in Figs. 1 and 6 are denoted by the same reference numerals, and descriptions thereof will be omitted.

[0048] The gear 66 is a gear that transmits the displacement of the lever interlocking structure 62 to the holding structure 61 .

[0049] Lever interlocking structure 62, which slides in conjunction with the fitting lever, rotates gear 66. The rotated gear 66 then displaces pressing structure 61 in a direction that clamps and presses down on the battery pack.

[0050] A spring 64 is provided between the pressing structure 61 and the cooling structure, so that a pressing load is applied from the cooling structure to the battery pack.

[0051] By providing cooling structures on both sides of the battery pack and pressing it down from both sides, the cooling area can be doubled. Although both are designed to move, one side can also be fixed. Figure 12 shows the structure when the pressing structure 61 is set on only one side.

[0052] As with the double-side pressing structure, the lever interlocking structure 62 rotates the gear 66 in conjunction with the mating lever. The rotation of the gear 66 displaces the pressing structure 61 in a direction that presses the detachable battery pack 11 against the cooling plate 22. In addition, a spring 64 is provided between the cooling structure and the vehicle fixed part to apply a pressing load. The spring 64 may be made of an elastic material (such as rubber).

[0053] (Embodiment 6) Fig. 13 is a cross-sectional view showing an example of an energy storage device structure according to embodiment 6. In Fig. 13, an energy storage device structure 80 includes a pressing structure 81 and a spring 82 in addition to the components of the energy storage device structure 10 in Fig. 1. The same components as those in Fig. 1 are denoted by the same numbers and descriptions thereof will be omitted.

[0054] The pressing structure 81 is a structure that presses the cooling plate from the side of the battery pack.

[0055] The spring 82 is a spring provided in the cooling structure 23 .

[0056] As shown in FIG. 13, when the detachable battery pack 11 is inserted, it presses the acute-angled pressing structure 81, and the cooling plate is pressed down from the side of the battery pack using the principle of leverage with the fixing portion 83 as the fulcrum.

[0057] Since the straight portion 81a of the pressing structure 81 that presses down on the battery pack may bend, causing the pressing load to become uneven, it is desirable to use a structure that suppresses bending by changing the thickness of the straight portion 81a.

[0058] Furthermore, by providing the cooling structure 23 with the spring 82, it is possible to apply a pressing load that brings the cooling plates into contact with each other.

[0059] The cooling plate may be mounted on the top, bottom, or side.

[0060] The present invention is not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the invention. For example, the first to sixth embodiments may be combined. [Explanation of symbols]

[0061] 10 Electricity storage device structure: 11 Detachable battery pack: 12 Battery cell: 13 Thermal conductor: 14 Cooling plate: 15 Rib structure: 21 Battery pack housing: 22 Cooling plate: 23 Cooling structure: 24 Vehicle

Claims

1. A detachable power storage device; a case having a first portion in contact with the power storage device and a second portion that is at least a part of the area excluding the first portion, and housing the power storage device therein; The first portion has a higher thermal conductivity than the second portion.

2. The structure of claim 1 , wherein the first portion is provided on an upper surface or a side surface of the case with the gravity direction facing downward.

3. The structure of the electric storage device according to claim 1 , further comprising a swipe structure for wiping foreign matter off at least one of a surface of the electric storage device and an interior of the case.

4. The structure of claim 1 , further comprising a pressing structure that presses the first portion of the power storage device against the case when the power storage device is inserted into the case.

5. a spring that applies a force to the pressing structure in a direction that moves the case away from the first portion of the power storage device; A mating lever; The structure of the electric storage device according to claim 4 , further comprising a gear that transmits the displacement of the fitting lever to the pressing structure.

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