Electricity storage device and method for manufacturing electricity storage device

Abstract

The invention relates to a power storage device and a method for manufacturing the power storage device. A power storage device is provided with: a power storage module; a housing case in which the power storage module is housed; and a plate-like member disposed on the outer wall of the housing case. A refrigerant passage through which a refrigerant can flow is formed by the outer wall of the housing case and the plate-shaped member.

Description

Technical Field

[0001] The present disclosure relates to an electricity storage device and a method for manufacturing the electricity storage device. Background Art

[0002] For example, Japanese Unexamined Patent Application Publication No. 2023-046659 discloses an electricity storage device having a structure in which a pre-manufactured cooler needs to be assembled with a housing through an outer heat conduction layer, and a flow pipe extending horizontally from the end of the cooler is connected to the cooler. Summary of the Invention

[0003] The electricity storage device disclosed in the above Patent Document 1 has a structure that requires a cooler manufacturing process and an assembly process of the cooler and the housing, so the operation efficiency is poor and the number of components also increases.

[0004] The present disclosure has been made in view of the above problems, and an object thereof is to provide an electricity storage device having a structure with fewer manufacturing processes and components in an electricity storage device equipped with a cooling device.

[0005] The electricity storage device according to the first aspect of the present disclosure includes: an electricity storage module; a housing that houses the electricity storage module; and a plate-like member disposed on an outer wall surface of the housing. A refrigerant passage through which a refrigerant can flow is formed by the outer wall surface of the housing and the plate-like member.

[0006] If configured in this way, a refrigerant passage through which a refrigerant can flow is formed by the outer wall surface of the housing and the plate-like member disposed on the outer wall surface. As a result, it is not necessary to independently manufacture a cooler in advance, and compared with conventional electricity storage devices, the manufacturing processes and the number of components can be reduced.

[0007] In the electricity storage device according to the first aspect of the present disclosure, the outer wall surface is formed in a flat surface shape. A groove portion formed so as to be separated from the outer wall surface is formed in the plate-like member, and the refrigerant passage is formed between the groove portion and the outer wall surface.

[0008] In the electricity storage device according to the first aspect of the present disclosure, as described above, the refrigerant passage is formed by the groove portion formed in the plate-like member and the outer wall surface. If configured in this way, the refrigerant passage can be easily formed by the plate-like member having the groove portion and the housing.

[0009] The electricity storage device according to the first aspect of the present disclosure further includes a circulation pipe that communicates with the refrigerant passage and through which the refrigerant circulates. The housing includes a bottom portion and a peripheral wall portion formed so as to stand up from the outer peripheral edge portion of the bottom portion. A concave portion is formed in the outer peripheral edge portion of the bottom portion so as to be recessed upward. The plate-like member includes: a main body portion located below the bottom portion; and a covering portion that extends upward from the main body portion and is formed so as to cover the concave portion. The circulation pipe is connected to the covering portion and is arranged to extend in the horizontal direction.

[0010] In the electricity storage device according to the first aspect of the present disclosure, as described above, a concave portion is formed in the outer peripheral edge portion of the bottom of the housing so as to be recessed upward. The circulation pipe is configured to be connected horizontally to the electricity storage device. In addition, the end portion of the circulation pipe communicates with the space formed by the concave portion. If configured in this way, the diameter of the circulation pipe can be set to a thickness corresponding to the opening area of the concave portion. As a result, the pressure loss of the refrigerant can be reduced. In addition, it is possible to prevent the circulation pipe from becoming the lowest part of the vehicle. As a result, an increase in the height of the vehicle can be suppressed.

[0011] The covering portion of the electricity storage device according to the first aspect of the present disclosure is formed so as to cover a portion of the peripheral wall portion located around the concave portion.

[0012] Since no groove portion is formed in the covering portion, the second moment of area (moment of inertia) is smaller than that of the main body portion. Therefore, when a load is applied to the covering portion, the covering portion can be easily moved along the housing. By adopting such a configuration, it is possible to provide an electricity storage device that does not require bending processing of the covering portion of the plate-like member before the joining process and has fewer manufacturing processes.

[0013] The electricity storage device according to the first aspect of the present disclosure further includes an electrical device disposed in the housing, and the electrical device is disposed in a portion of the housing where the concave portion is formed.

[0014] By configuring in this way, it is possible to arrange the electronic device in a space where the electricity storage module cannot be arranged due to the formation of the concave portion in the housing. As a result, the space can be effectively utilized.

[0015] The manufacturing method of the storage device of the second aspect of the present disclosure includes: a process of arranging a plate-like member on the outer wall surface of the housing shell, the plate-like member having a groove portion formed in a manner away from the outer wall surface; a process of arranging a first electrode member in the housing shell; a process of arranging a second electrode member on the side of the plate-like member; and a process of joining the housing shell and the plate-like member by using the heat generated by causing current to flow between the first electrode member and the second electrode while the housing shell and the groove edge portion are pressurized by the first electrode member and the second electrode member. The joining process includes a process of linearly joining the housing shell and the plate-like member by rotating the first electrode member, the outer periphery of the first electrode member including a circular arc portion and a straight line portion, and the second electrode member having a recessed portion corresponding to the groove portion and formed in a manner of integrally covering the groove portion.

[0016] The first electrode member including the arc portion and the straight portion forms a linear welding line by rotating. The first electrode member thus constructed can avoid interference between the first electrode member and the peripheral wall portion at the corner of the housing, thereby enabling bonding at the end of the housing.

[0017] The second electrode member is arranged below the path of the first electrode member sandwiching the housing and the plate-like member. The second electrode member is formed in a manner that can integrally cover the groove portion formed on the plate-like member. In addition, a recess corresponding to the groove portion is formed in the second electrode member. The second electrode member thus constructed has a larger heat capacity than an electrode independently formed across the groove portion. As a result, it is possible to suppress the second electrode member from melting due to the heat during resistance welding.

[0018] The foregoing and other objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of the present invention when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram schematically showing a vehicle equipped with the power storage device according to the present embodiment.

[0020] Figure 2 It is a perspective view schematically showing the power storage device according to the present embodiment.

[0021] Figure 3 yes Figure 2 An exploded perspective view of the power storage device shown.

[0022] Figure 4 Looking up from below Figure 3 A diagram obtained by decomposing a stereogram of .

[0023] Figure 5 1 is a flowchart showing the steps of manufacturing the power storage device according to the present embodiment.

[0024] Figure 6It is a schematic diagram showing the configuration process of manufacturing the power storage device of the present embodiment.

[0025] Figure 7 It is a schematic diagram showing the first bonding process of manufacturing the power storage device of the present embodiment.

[0026] Figure 8 It is Figure 7 a cross-sectional view taken along the IX-IX section.

[0027] Figure 9 It is a schematic diagram showing the second bonding process of manufacturing the power storage device of the present embodiment.

[0028] Figure 10 It is an exploded perspective view of the first modified example of the power storage device of the present embodiment.

[0029] Figure 11 It is an exploded perspective view of the second modified example of the power storage device of the present embodiment.

[0030] Figure 12 It is an exploded perspective view of the third modified example of the power storage device of the present embodiment. Detailed Embodiments

[0031] Embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, in the accompanying drawings referred to below, the same or corresponding components are denoted by the same reference numerals.

[0032] <Configuration of the Power Storage Device>

[0033] Figure 1 It is a diagram schematically showing a vehicle equipped with the power storage device of the present embodiment. The power storage device 10 is mounted, for example, on the lower part of the vehicle 1. In addition, in Figure 1 etc., the first direction L1 represents the longitudinal direction of the vehicle 1, and the second direction L2 represents the vehicle width direction of the vehicle 1.

[0034] Figure 2 It is a schematic perspective view generally showing the power storage device of the present embodiment. Figure 3 It is Figure 2 an exploded perspective view of the power storage device shown.

[0035] As Figure 3 shown, the power storage device 10 includes a power storage unit 100, an electrical device 200, a housing case 300, a plate-like member 400, and a flow pipe 500. In Figure 2 and Figure 3 the upper cover of the housing case 300 is omitted. The power storage unit 100 and the electrical device 200 are housed in the housing case 300. The power storage unit 100 has a power storage module 101 and a power storage module 102.

[0036] Each of the power storage modules 101 and 102 has a plurality of power storage units 110 arranged side by side in the second direction L2. The plurality of power storage units 110 are formed to be long in the first direction L1. The plurality of power storage units 110 are, for example, lithium ion batteries.

[0037] The electrical device 200 has recesses corresponding to the recesses 350 and 360 formed in the housing case 300 described later. The electrical device 200 is disposed above the recesses 350 and 360 formed in the housing case 300. The electrical device 200 is, for example, a junction box. With such a configuration, the space where the power storage unit 100 cannot be disposed due to the recess 350 can be effectively utilized.

[0038] The housing case 300 has an outer wall 310 and a partition wall 380.

[0039] The outer wall 310 is formed to open upward. The outer wall 310 includes a bottom portion 315, a peripheral wall portion 320, and recesses 350 and 360. The outer wall surface 310a of the outer wall 310 includes the bottom surface 315a of the bottom portion 315, the peripheral wall surface 320a of the peripheral wall portion 320, and the inner peripheral surfaces 350a and 360a of the recesses 350 and 360.

[0040] The bottom portion 315 is formed in a rectangular shape and in a flat surface shape. The power storage unit 100 is disposed above the bottom portion 315.

[0041] The peripheral wall portion 320 is formed to stand up from the outer peripheral edge portion 315b of the bottom portion 315. The peripheral wall portion 320 includes long wall portions 321 and 322 and end wall portions 323 and 324.

[0042] The long wall portions 321 and 322 are formed to be long in the first direction L1, and the long wall portion 321 and the long wall portion 322 are disposed at intervals in the second direction L2.

[0043] The end wall portions 323 and 324 are disposed at intervals in the first direction L1. In addition, the length of the end wall portions 323 and 324 in the second direction L2 is shorter than the length of the long wall portions 321 and 322 in the first direction L1.

[0044] Figure 4 is a view obtained by looking up from below Figure 3 of the exploded perspective view. For convenience, the power storage unit 100 is omitted.

[0045] The recesses 350 and 360 are formed in the outer peripheral edge portion 315b of the bottom portion 315. Specifically, the recesses 350 and 360 are formed in the boundary portion between the bottom portion 315 and the end wall portion 323. In addition, the recess 350 and the recess 360 are formed at intervals in the second direction L2. The recesses 350 and 360 are formed to be recessed upward from the bottom portion 315.

[0046] The opening edge portion 351a of the recess 350 includes a rim portion (edge portion) 352a located on the rim of the end wall portion 323 and a rim portion 352b located on the bottom 315.

[0047] The opening edge portion 361a of the recess 360 includes a rim portion 362a located on the rim of the end wall portion 323 and a rim portion 362b located on the bottom 315.

[0048] Referring again to Figure 3 , a partition wall 380 is formed on the bottom 315. The partition wall 380 is formed to extend along the second direction L2, and both ends of the partition wall 380 are connected to the long wall portion 321 and the long wall portion 322. The partition wall 380 is arranged so as to separate the power storage modules 101 and 102 in the first direction L1. The upper surface of the partition wall 380 and the upper surface of the peripheral wall portion 320 are formed in the same plane.

[0049] Referring again to Figure 4 , a plate-like member 400 is disposed below the bottom 315. The plate-like member 400 includes a main body portion 410 and covering portions 420 and 430.

[0050] The main body portion 410 is disposed below the bottom 315. In addition, the main body portion 410 is formed so as to cover the lower portions of the power storage modules 101 and 102 housed in the housing case 300 as a whole. Further, the rim portions 352b and 362b are covered by the main body portion 410.

[0051] A groove portion 411 is formed in the main body portion 410 so as to be separated from the bottom 315. One end portion 411b of the groove portion 411 is disposed below the recess 350 formed in the bottom 315. The other end portion 411c of the groove portion 411 is disposed below the recess 360 formed in the bottom 315.

[0052] The groove portion 411 is integrally formed over the entire area of the main body portion 410. The groove portion 411 is formed in a U shape. The groove portion 411 includes a long groove 412, a long groove 413, and a connecting groove 414.

[0053] The long groove 412 and the long groove 413 extend in the first direction L1 and are formed at intervals in the second direction L2.

[0054] The connecting groove 414 is formed so as to connect the long groove 412 and the long groove 413.

[0055] The covering portion 420 and the covering portion 430 are arranged at intervals in the second direction L2. The covering portion 420 is formed to extend upward from the end of the main body portion 410. The covering portion 420 is arranged to cover the recessed portion 350. More specifically, the covering portion 420 is provided to cover both the edge portion 352a and the portion surrounding the edge portion 352a. The covering portion 420 has an opening 421.

[0056] The covering portion 430 is formed to extend upward from the end of the main body portion 410. The covering portion 430 is arranged to cover the recessed portion 360. More specifically, the covering portion 430 is provided to cover both the edge portion 362a and the portion surrounding the edge portion 362a. The covering portion 430 has an opening 431.

[0057] The refrigerant passage 410a is formed by the groove portion 411 and the bottom portion 315. A space 410b is formed by the covering portion 420 covering the edge portion 352a and the main body portion 410 covering the edge portion 352b. One end of the refrigerant passage 410a communicates with the space 410b.

[0058] A space 410c is formed by the covering portion 430 covering the edge portion 362a and the main body portion 410 covering the edge portion 362b. The other end of the refrigerant passage 410a communicates with the space 410c.

[0059] The circulation pipe 500 is a pipe formed to extend along the first direction L1. The circulation pipe 500 has an inflow pipe 501 and an outflow pipe 502. The end portion 501a of the inflow pipe 501 communicates with the space 410b through the opening 421. The circulation pipe 501 and the opening 421 are sealed by welding. The end portion 502a of the outflow pipe 502 communicates with the space 410c through the opening 431. The outflow pipe 502 and the opening 431 are sealed by welding.

[0060] The plate-like member 400 and the housing case 300 are joined by welding lines 100a, 101b, 102b, 101c, and 102c.

[0061] The welding line 100a includes an outer portion 100a1, an inner portion 100a2, an inner portion 100a3, an outer portion 100a4, an outer portion 100a5, and an inner portion 100a6.

[0062] The outer portion 100a1 extends along the outer peripheral edge portion of the outside of the elongated groove 412, and the inner portion 100a2 extends along the inner peripheral edge portion of the inside of the elongated groove 412.

[0063] Similarly, the inner portion 100a3 extends along the inner peripheral edge portion of the inside of the elongated groove 413, and the outer portion 100a4 extends along the outer peripheral edge portion of the outside of the elongated groove 413.

[0064] The outer portion 100a5 extends along the outer peripheral edge portion of the outer side of the connection groove 414, and the inner portion 100a6 extends along the inner peripheral edge portion of the inner side of the connection groove 414.

[0065] The welding line 101b includes an outer portion 101b1 and an inner portion 101b2.

[0066] The outer portion 101b1 is formed in such a way as to connect the outer portion 100a1 to the welding line 101c and extend along the first direction L1.

[0067] The inner portion 101b2 is formed in such a way as to connect the inner portion 100a2 to the welding line 101c and extend along the first direction L1.

[0068] The welding line 102b includes an inner portion 102b1 and an outer portion 102b2.

[0069] The inner portion 102b1 is formed in such a way as to connect the inner portion 100a3 to the welding line 102c and extend along the first direction L1.

[0070] The outer portion 102b2 is formed in such a way as to connect the outer portion 100a4 to the welding line 101c and extend along the first direction L1.

[0071] The welding line 101c is formed along the edge portion 352a, and the welding line 102c is formed along the edge portion 362a.

[0072] In the vehicle 1 equipped with the power storage device 10 configured as described above, when the vehicle 1 travels or the like, the power storage device 10 repeatedly performs charge and discharge. As a result, the power storage device 10 generates heat.

[0073] On the other hand, the refrigerant C enters the space 410b from the inflow pipe 501, and then flows in the refrigerant passage 410a, thereby cooling the power storage modules 101 and 102. Then, after the refrigerant C flows into the space 410c, it is discharged from the outflow pipe 502. In this way, by circulating the refrigerant C in the refrigerant passage 410a, the power storage modules 101 and 102 can be cooled well.

[0074] <Method for manufacturing a power storage device>

[0075] Next, with reference to Figures 5 to 8 An example of the manufacturing method of the power storage device 10 will be described. Figure 5 is a flowchart showing the present embodiment of the manufacturing method of the power storage device 10. As Figure 5 shown, the manufacturing process of the power storage device 10 includes an arrangement process S1, a first joining process S2, and a second joining process S3.

[0076] Through Figure 6 the configuration process S1 will be described. Figure 6 is a schematic diagram showing the configuration process of manufacturing the power storage device of the present embodiment. In the configuration process S1, the plate-like member 401 is arranged below the housing 300. The plate-like member 401 has a main body portion 410, a covering portion 425, and a covering portion 435.

[0077] The end portion 411b of the groove portion 411 formed in the main body portion 410 is arranged below the concave portion 350. Similarly, the end portion 411c is arranged below the concave portion 360.

[0078] The covering portion 425 and the covering portion 435 are formed on the same plane as the main body portion 410. The covering portion 425 and the covering portion 435 are formed in a manner of connecting to the end portion of the main body portion 410. The covering portion 425 and the covering portion 435 are arranged at intervals in the second direction L2.

[0079] The inflow pipe 501 is inserted into the covering portion 425 through the opening portion 421. The inflow pipe 501 is welded to the opening portion 421.

[0080] The inflow pipe 502 is inserted into the covering portion 435 through the opening portion 431. The outflow pipe 502 is welded to the opening portion 431.

[0081] Through Figure 7 and Figure 8 the first joining process S2 will be described. Figure 7 is a schematic diagram showing the first joining process of manufacturing the power storage device of the present embodiment. Figure 8 is Figure 7 a cross-sectional view taken at the IX-IX section of. First, referring to Figure 7 , in the first joining process S2, the bottom 315 of the housing 300 and the main body portion 410 of the plate-like member 401 are joined by Figure 5 the welding lines 100a, 101b, and 101c shown. The joining is performed by seam welding, for example, by a known method. In the first joining process S2, it includes: the process of arranging the first electrode member 20 inside the housing 300; and the process of arranging the second electrode member 30 below the plate-like member 400.

[0082] When viewed from the second direction L2, the first electrode member 20 is formed in a notch disc shape composed of at least one straight line 20a and an arc 20b. Next, referring to Figure 8 , the first electrode member 20 has a thickness t2. The first electrode member 20 has a bearing 20c at the center of the circle with an arc 20b in a part. The first electrode member 20 is supported by a support member 21.

[0083] The support member 21 has a shaft 21a passing through the bearing 20c and a pair of rods 21b. A terminal 22 connected to a power source is formed on the support member 21. The first electrode member 20 is electrically connected to the terminal 22.

[0084] The first electrode member 20 transfers the load in the vertical direction received from the support member 21 to the bottom 315. In addition, the first electrode member 20 rotates in the circumferential direction R1 due to the load in the horizontal direction received from the support member 21 and the frictional force received from the bottom 315. The first electrode member 20 starts rotating from the starting point a1 and stops rotating at the ending point a2. The first electrode member 20 starts rotating again from the starting point a1 with the arrival point at the ending point a2 as the starting point. The first electrode member 20 repeats this cycle and moves on the Figure 4 welding lines 100a, 101b, 102b shown.

[0085] The second electrode member 30 is disposed below the plate-like member 401. The second electrode member 30 is integrally formed so as to be able to cover the entire edge portions 352b, 362b via the groove edge portion 411a and the main body portion 410. The second electrode member 30 may also be formed so as to cover the entire main body portion 410. A recess 31 corresponding to the groove portion 411 is formed in the second electrode member 30. The second electrode member 30 is placed on a base (not shown) and receives the reaction force of the load applied to the bottom 315 by the first electrode member 20. The second electrode member 30 has a terminal 32.

[0086] With such a configuration, it is possible to press the bottom 315 and the groove edge portion 411a using the first electrode member 20 and the second electrode member 30. Moreover, by flowing an electric current between the first electrode member 20 and the second electrode member 30 via the terminals 22, 32, Joule heat caused by resistance can be generated between the bottom 315 and the groove edge portion 411a. By pressing and Joule heat, the bottom 315 and the groove edge portion 411a are joined. As the first electrode member 20 rotates and moves in the circumferential direction R1, the welded portion is formed in a linear shape, forming the welding line 100a.

[0087] Similarly, it is possible to join the bottom 315 and the edge portions 352b, 362b using the first electrode member 20 and the second electrode member 30. Thereby, the welding lines 101b, 102b are formed.

[0088] The first electrode member 20 is formed in a notched disc shape composed of a straight line 20a and an arc 20b. With such a configuration, during the formation of the Figure 4 welding lines 100a, 101b, 102b shown, interference between the first electrode member 20 and the peripheral wall portion 320 as shown by the Figure 7 dashed line can be avoided.

[0089] In addition, in Figure 8In [the above], the second electrode member 30 which is integrally formed and has a recess 31 is disposed below the plate-like member 400. With such a configuration, regardless of the gap g1 between the adjacent groove edge portions 411a, the second electrode member 30 can be in contact with the main body portion 410.

[0090] For example, when the first electrode member 20 is disposed below the plate-like member 400 instead of the second electrode member 30, if the thickness t2 of the first electrode member 20 is thicker than the gap g1 between the adjacent groove edge portions 411a, the first electrode member 20 will interfere with the groove portion 411. As a result, the first electrode member 20 cannot be in contact with the groove edge portion 411a, and the joining of the bottom portion 315 and the plate-like member 400 cannot be achieved. In the embodiment of the present disclosure, this problem is solved by disposing the second electrode member 30 below the plate-like member 400.

[0091] In addition, the second electrode member 30 configured in this way has a larger heat capacity than the electrodes formed independently with the groove portion 411 therebetween. As a result, it is possible to suppress the melting of the electrode member due to heat generated by resistance.

[0092] In the above embodiment, an example in which the second electrode member 30 is integrally formed is shown, but the present disclosure is not limited thereto. For example, the second electrode member 30 may also be formed of a plurality of electrode members that can cover the edge portions 352b and 362b via the groove edge portion 411a and the main body portion 410.

[0093] By Figure 9 the second joining step S3 will be described. Figure 9 is a schematic diagram showing the second joining step of manufacturing the power storage device of the present embodiment. In the second joining step S3, the end wall portion 323 and the covering portions 420 and 430 of the plate-like member 401 are joined by Figure 4 the welding lines 101c and 102c shown. The joining is performed by, for example, known seam welding. In the second joining step S3, it includes: a step of disposing the third electrode member 40 inside the housing case 300; and a step of disposing the fourth electrode member 50 below the plate-like member 401.

[0094] The third electrode member 40 is formed with recesses corresponding to the shapes of the recesses 350 and 360 formed in the outer wall 310. In addition, the third electrode member 40 is formed so as to cover the portions around the opening edge portions 351a and 361a of the end wall portion 323 from inside the housing case. The third electrode member 40 has a terminal 42 connected to the power source.

[0095] The fourth electrode member 50 is formed in a disc shape. The fourth electrode member 50 is held by the support member 51. The structure of the support member 51 is the same as that of the support member 21. A terminal 52 connected to a power source is formed in the support member 51. The fourth electrode member 50 applies a load in a direction perpendicular to the housing case 300 to the plate-like member 401 from the support member 51. In addition, the fourth electrode member 50 rotates and moves in the circumferential direction R2 by the load in the direction horizontal to the housing case 300 received from the support member 51 and the frictional force received from the plate-like member 400.

[0096] With such a configuration, the shape of the plate-like member 401 can be processed into the shape of the plate-like member 400 by the third electrode member 40 and the fourth electrode member 50. Specifically, by the fourth electrode member 50 rotating and moving in the circumferential direction R2 from the boundary between the main body portion 410 and the covering portion 425 onto the covering portion 425, the covering portion 425 can be deformed into a shape along the end wall portion 323 (covering portion 420). The same applies to the covering portion 435. Moreover, by passing an electric current between the third electrode member 40 and the fourth electrode member 50, Joule heat caused by resistance is generated between the end wall portion 323 and the covering portions 420 and 430. By pressurization and Joule heat, the end wall portion 323 and the covering portions 420 and 430 are joined. At this time, by the fourth electrode member 50 rotating and moving in the circumferential direction R2, the welded portion is formed in a linear shape, forming the welding line 100c.

[0097] In addition, since the covering portions 420 and 430 are configured to cover the peripheries of the edge portions 352a and 362a of the end wall portion 323, the fourth electrode member 50 can move on the welding line 100c without interfering with the flow tube 500.

[0098] Through the above processes, the power storage device 10 is manufactured.

[0099] According to an embodiment of the present disclosure, the refrigerant passage 410a is formed by the bottom portion 315 of the housing case 300 integrally formed with an upward opening and the groove portion 411 of the plate-like member 400. With such a configuration, there is no need to independently manufacture a cooler having a refrigerant passage in advance, and compared with conventional power storage devices, the manufacturing processes and the number of components can be reduced.

[0100] In the above embodiment, an example in which the refrigerant passage 410a is formed by the housing case 300 and the plate-like member 400 disposed below the bottom portion 315 of the housing case 300 is shown, but the present disclosure is not limited thereto. For example, the refrigerant passage may be formed by the flat surface-like peripheral wall surface 320a and the plate-like member 400 disposed on the peripheral wall surface 320a. Thereby, the power storage modules 101 and 102 housed in the housing case 300 can be cooled from the side.

[0101] In the above embodiment, an example in which 350 and 360 are formed at intervals in the second direction is shown, but the present disclosure is not limited thereto. For example, only one recess may be provided.

[0102] <First Modified Example of the Power Storage Device>

[0103] In the above embodiment, an example in which the power storage device 10 includes the housing 300 and the plate-like member 400 is shown, but the present disclosure is not limited thereto.

[0104] For example, first, as Figure 10 shown, the power storage device 10A may also include the housing 300 and the plate-like member 400A.

[0105] The plate-like member 400A is disposed below the housing 300. The outer shape of the plate-like member 400A coincides with the outer peripheral edge portion 315b.

[0106] The plate-like member 400A includes a main body portion 410 and covering portions 440 and 450. The covering portions 440 and 450 are arranged at intervals in the second direction L2.

[0107] The covering portion 440 is formed so as to extend upward from the end portion of the plate-like member 400A. The covering portion 440 has a peripheral wall portion 441 and a side wall portion 442. The peripheral wall portion 441 is formed so as to follow the inner peripheral surface 350a of the recess 350. An opening 442a is formed in the side wall portion 442. A circulation pipe 500 penetrates through the opening 442a.

[0108] The covering portion 450 is similarly formed so as to extend upward from the end portion of the plate-like member 400A. The covering portion 450 has a peripheral wall portion 451 and a side wall portion 452. The peripheral wall portion 451 is formed so as to follow the inner peripheral surface 360a of the recess 360. An opening 452a is formed in the side wall portion 452. A circulation pipe 500 penetrates through the opening 452a.

[0109] The refrigerant passage 410a is formed by the groove portion 411 and the bottom surface 315a. The peripheral wall portion 441 covers the inner peripheral surface 350a along the edge portion 352a, thereby forming a space 440b. The peripheral wall portion 451 covers the inner peripheral surface 360a along the edge portion 362a, thereby forming a space 440c.

[0110] One end of the refrigerant passage 410a communicates with the space 440b, and the other end of the refrigerant passage 410a communicates with the space 450b.

[0111] In the power storage device 10A, the bottom portion 315 and the plate-like member 400A are joined by welding lines 100a, 101b, 102b, 141c, and 151c. The welding lines 100a, 101b, and 102b are as described above.

[0112] The welding line 141c is formed on the peripheral wall surface 441a of the peripheral wall portion 441 along the edge portion 352a and connected to the welding line 101b.

[0113] Similarly, the welding line 151c is formed on the peripheral wall surface 451a of the peripheral wall portion 451 along the edge portion 362a and connected to the welding line 102b.

[0114] <Second modification example of the power storage device>

[0115] For example, second, as Figure 11 shown, the power storage device 10B may also include a housing 300 and a plate-like member 400B. The plate-like member 400B is disposed below the housing 300. The outer shape of the plate-like member 400B coincides with the outer peripheral edge portion 315b.

[0116] A groove portion 460 is formed in the plate-like member 400B. The groove portion 460 is formed so as to be separated from the bottom surface 315a.

[0117] The groove portion 460 is formed in a U-shape. The groove portion 460 includes a long groove 461, a long groove 462, and a connecting groove 463. The long groove 461 and the long groove 462 extend in the first direction L1 and are formed at intervals in the second direction L2. The connecting groove 463 is formed so as to connect the long groove 461 and the long groove 462.

[0118] The groove portion 460 opens below the concave portion 350 and at the end portion 460b of the plate-like member 400B. The groove portion 460 opens below the concave portion 360 and at the end portion 460c of the plate-like member 400B. The end portions 460b and 460c are arranged at intervals in the second direction L2.

[0119] A circulation pipe 500 penetrates through the sealing bodies 601 and 602. The end portion 500a of the circulation pipe 500 communicates with the spaces 461b and 461c.

[0120] The refrigerant passage 461a is formed by the groove portion 460 and the bottom surface 315a. The sealing body 601 seals between the end portion 460b and the inner peripheral surface 350a, thereby forming the space 461b. Similarly, the sealing body 602 seals between the end portion 460c and the inner peripheral surface 360a, thereby forming the space 461c.

[0121] One end of the refrigerant passage 461a communicates with the space 461b, and the other end of the refrigerant passage 461a communicates with the space 461c.

[0122] In the power storage device 10B, the bottom portion 315 and the plate-like member 400B are joined by a welding line 100d.

[0123] The welding line 100d includes an outer portion 100d1, an inner portion 100d2, an inner portion 100d3, an outer portion 100d4, an outer portion 100d5, and an inner portion 100d6.

[0124] The outer portion 100d1 extends along the outer peripheral edge portion of the outer side of the long groove 461, and the inner portion 100d2 extends along the inner peripheral edge portion of the inner side of the long groove 461.

[0125] Similarly, the inner portion 100d3 extends along the inner peripheral edge portion of the inner side of the long groove 462, and the outer portion 100d4 extends along the outer peripheral edge portion of the outer side of the long groove 462.

[0126] The outer portion 100d5 extends along the outer peripheral edge portion of the outer side of the connection groove 463, and the inner portion 100d6 extends along the inner peripheral edge portion of the inner side of the connection groove 463.

[0127] <The third modification example of the power storage device>

[0128] For example, thirdly, as Figure 12 shown, the power storage device 10C may also include a housing case 700 and a plate-like member 800.

[0129] The housing case 700 has an outer wall 710.

[0130] The outer wall 710 is formed to open upward. The outer wall 710 includes a bottom portion 715, a peripheral wall portion 720, and a recess portion 750. The recess portion 750 includes recesses 760, 770, and 780.

[0131] The outer wall surface 710a of the outer wall 710 includes the bottom surface 715a of the bottom portion 715, the peripheral wall surface 720a of the peripheral wall portion 720, and the inner peripheral surface 750a of the recess portion 750. The inner peripheral surface 750a includes the inner peripheral surfaces 760a, 770a, and 780a of the recesses 760, 770, and 780.

[0132] The bottom portion 715 is formed in a rectangular shape and in a flat surface shape. The power storage unit 100 is disposed above the bottom portion 715.

[0133] The peripheral wall portion 720 is formed to stand up from the outer peripheral edge portion 715b of the bottom portion 715. The peripheral wall portion 720 includes long wall portions 721, 722 and end wall portions 723, 724.

[0134] The long wall portions 721, 722 are formed to be long in the first direction L1, and the long wall portion 721 and the long wall portion 722 are disposed at intervals in the second direction L2.

[0135] The end walls 723 and 724 are arranged at intervals in the first direction L1. The end walls 723 and 724 are formed to be long in the second direction L2. In addition, the length of the end walls 723 and 724 in the second direction L2 is shorter than the length of the long walls 721 and 722 in the first direction L1.

[0136] The recesses 760, 770, and 780 are formed to be recessed inward at the bottom 715. The recesses 760 and 770 are formed to extend along the first direction L1. The recess 780 is formed to extend along the second direction L2. The recesses 760 and 770 are formed at intervals in the second direction L2. One end of the recess 760 and one end of the recess 770 are respectively opened at the end wall 723. The recess 780 is formed to connect the other end of the recess 760 and the other end of the recess 770.

[0137] The opening edge portion 751a of the recess 750 includes the edge portions 752a and 752b located at the end wall 723 and the edge portion 752c located at the bottom 715.

[0138] The plate-like member 800 is disposed below the housing 700. The outer shape of the plate-like member 800 coincides with the outer peripheral edge portion 715b.

[0139] The plate-like member 800 includes a main body portion 810 and covering portions 840 and 850. The covering portions 840 and 850 are arranged at intervals in the second direction L2. The covering portions 840 and 850 are formed to extend upward from the end of the plate-like member 800. Openings 842a and 852a are respectively formed in the covering portions 840 and 850. The flow pipe 500 penetrates through the openings 842a and 852a respectively.

[0140] The refrigerant passage 810a is formed by using the recess 750 and the plate-like member 800. More specifically, the main body portion 810 covers the bottom surface 715a, the covering portion 840 covers both the edge portion 752a in the end wall 723 and the portion around the edge portion 752a, and the covering portion 850 covers both the edge portion 752b in the end wall 723 and the portion around the edge portion 752b, thereby forming the refrigerant passage 810a.

[0141] In the power storage device 10C, the bottom 715 and the plate-like member 800 are joined by welding lines 900. The welding lines 900 include welding lines 900a, 900b, and 900c.

[0142] The welding line 900a is formed to extend along the edge portion 752a and connect to the welding line 900c.

[0143] The welding line 900b is formed to extend along the edge portion 752b and connect to the welding line 900c.

[0144] The welding wire 900c is formed so as to extend along the edge portion 752c and connect to the welding wires 900a and 900b.

[0145] If, as Figure 10 , Figure 11 , Figure 12 shown, the power storage device is configured, then, similarly to the embodiment of the present disclosure, the pipe diameter of the flow pipe can be set to a thickness corresponding to the opening area of the concave portion. As a result, the pressure loss of the refrigerant can be reduced. Further, by horizontally connecting the flow pipes, it is possible to prevent the flow pipes from becoming the lowest part of the vehicle. As a result, an increase in the height of the vehicle can be suppressed.

[0146] The embodiments of the present invention have been described, but it should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is shown by the claims, and is intended to include meanings equivalent to the claims and all modifications within the scope.

Claims

1. A power storage device, comprising: A power storage module; A housing that houses the power storage module; and A plate-like member disposed on an outer wall surface of the housing, A refrigerant passage through which refrigerant can flow is formed by the outer wall surface of the housing and the plate-like member.

2. The power storage device according to claim 1, The outer wall surface is formed in a flat surface shape, A groove portion is formed in the plate-like member so as to be separated from the outer wall surface, The refrigerant passage is formed between the groove portion and the outer wall surface.

3. The power storage device according to claim 1 or 2, The power storage device further includes a circulation pipe that communicates with the refrigerant passage and through which refrigerant flows, The housing includes a bottom portion and a peripheral wall portion formed so as to stand up from a peripheral edge portion of the bottom portion, A concave portion is formed in the peripheral edge portion of the bottom portion so as to be recessed upward, The plate-like member includes: A main body portion located below the bottom portion; And a covering portion formed to extend upward from the main body portion and cover the concave portion, The circulation pipe is connected to the covering portion and is disposed to extend in a horizontal direction.

4. The power storage device according to claim 3, The covering portion is formed so as to cover a portion of the peripheral wall portion located around the concave portion.

5. The power storage device according to claim 1, The power storage device further includes an electrical device disposed in the housing, The electrical device is disposed in a portion of the housing where the concave portion is formed.

6. A method for manufacturing a power storage device, comprising: A step of disposing a plate-like member on an outer wall surface of a housing, the plate-like member having a groove portion formed so as to be separated from the outer wall surface; A step of disposing a first electrode member in the housing; A step of disposing a second electrode member on the side of the plate-like member; And A step of joining the housing and the plate-like member by heat generated by flowing current between the first electrode member and the second electrode member while pressing the housing and a groove edge portion of the groove portion with the first electrode member and the second electrode member, The joining step includes a step of linearly joining the housing and the plate-like member by rotating the first electrode member, An outer periphery of the first electrode member includes an arc portion and a straight portion, The second electrode member is formed with a concave portion corresponding to the groove portion and is formed so as to cover the groove portion.

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