Power storage device

Abstract

To make a main bus bar 410 hard to deform.SOLUTION: A power storage device comprises: a power storage module including an external terminal; a relay box which is provided at a position adjacent to the power storage module; a cooler 14 which is provided in contact with the power storage module; and a main bus bar 410 which is provided on an opposite side of the power storage module with respect to the cooler 14 and connected to the external terminal and the relay box. The cooler 14 includes a supply part 141, to which a coolant is supplied, and a flow passage 143 in which the coolant flows. The flow passage 143 includes an introduction portion 148 extending from a connection portion with the supply part 141. The main bus bar 410 includes an overlap portion 412 which extends so as to overlap the introduction portion 148. Thus, the main bus bar 410 is provided so as to at least partially overlap the introduction portion 148 in which the coolant in a cooled state in relative to a portion other than the introduction portion in the flow passage 143 flows. Therefore, the main bus bar 410 can be satisfactorily cooled.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] This disclosure relates to an electricity storage device. [Background technology]

[0002] BACKGROUND ART Conventionally, there has been a battery pack in which a cooling device for cooling a power storage module in a power storage device is arranged at a position where it cools a bus bar (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-510277 Summary of the Invention [Problem to be solved by the invention]

[0004] Since a large current flows through the bus bar, the bus bar is prone to becoming hot. In a structure such as that described in Patent Document 1, if the bus bar becomes hot, the bus bar may deform in the direction of extension, which may result in a large load being applied to the terminal to which the bus bar is connected.

[0005] This disclosure has been made to solve the above-mentioned problems, and an object of the disclosure is to provide an electricity storage device that can make it difficult for bus bars to deform. [Means for solving the problem]

[0006] The power storage device according to this disclosure includes a storage battery including a connection terminal, a connection device provided adjacent to the storage battery, a cooler provided in contact with the storage battery, and a main bus bar provided on the opposite side of the cooler from the storage battery and connected to the connection terminal and the connection device. The cooler includes a supply portion through which a refrigerant is supplied and a flow passage through which the refrigerant flows. The flow passage includes an introduction portion extending from a connection portion with the supply portion. The main bus bar includes an overlap portion extending to overlap with the introduction portion.

[0007] With this configuration, the main bus bar is positioned so as to at least partially overlap the inlet portion of the flow passage through which the refrigerant flows, which is cooler than the remaining portion of the flow passage. This allows the main bus bar to be efficiently cooled, thereby providing an electricity storage device in which the bus bar is less likely to deform.

[0008] The storage battery may be composed of a plurality of storage modules. Each of the plurality of storage modules has a positive terminal and a negative terminal, is capable of charging and discharging power, and is electrically connected in series. The connection terminals include a total positive terminal and a total negative terminal. The total positive terminal is the positive terminal at the end of the series connection of the storage modules. The total negative terminal is the negative terminal at the end of the series connection of the storage modules. The first direction, the second direction, and the third direction are perpendicular to each other. The storage modules are longer in the third direction than the first and second directions, and have positive and negative terminals at both ends in the third direction. The plurality of storage modules are arranged in the first direction so that the positive and negative terminals of each of two adjacent storage modules are alternately arranged at one end in the third direction. The storage device further includes a plurality of inter-module bus bars that respectively connect the positive and negative terminals of each of two adjacent storage modules so that all of the plurality of storage modules are connected in series. The connection device includes a first terminal and a second terminal. The main bus bar connects the first terminal to either the total positive terminal or the total negative terminal, whichever is farther from the connection device, and may be provided at a position distant from the plurality of inter-module bus bars.

[0009] According to this configuration, the main bus bar and the inter-module bus bar can be arranged apart from each other, which makes it possible to prevent the main bus bar and the inter-module bus bar from coming into contact with each other.

[0010] The power supply may further include a sub-bus bar that connects the second terminal to either the total positive terminal or the total negative terminal that is not connected to the first terminal, and the sub-bus bar may be provided at a position away from the main bus bar.

[0011] According to this configuration, the main bus bar and the sub-bus bar can be arranged apart from each other, which can prevent the main bus bar and the sub-bus bar from coming into contact with each other.

[0012] The cooler may further include a discharge portion from which the refrigerant is discharged, the flow path may include a discharge portion connected to the discharge portion, and the main bus bar may not include a portion overlapping with the discharge portion.

[0013] This configuration prevents the main bus bar from overlapping with the discharge portion of the flow passage through which the refrigerant flows, the temperature of which is higher than that of the remaining portions of the flow passage. This prevents the temperature of the main bus bar from rising, making it difficult for the bus bar to deform. [Effects of the Invention]

[0014] According to this disclosure, it is possible to provide an electricity storage device in which it is possible to make the bus bars less susceptible to deformation. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a side view that schematically illustrates a vehicle that includes an electricity storage device according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view schematically showing an electricity storage device and a vehicle frame according to an embodiment of the present invention; [Figure 3] 1 is a cross-sectional view showing an outline of how the electricity storage device of this embodiment is attached to a vehicle. [Figure 4] 1 is a perspective view showing an outline of the configuration of an electricity storage device according to an embodiment of the present invention; [Figure 5] 1 is a perspective view showing the general shape of a power storage module included in the power storage device of this embodiment. [Figure 6] FIG. 2 is a plan view showing an outline of the interior of the electricity storage device according to this embodiment. [Figure 7] 10A and 10B are diagrams illustrating the positional relationship between the flow of refrigerant in the cooler and the main bus bar in this embodiment. [Figure 8] FIG. 4 is a diagram showing the flow of refrigerant in the cooler of this embodiment. [Figure 9] FIG. 10 is a diagram showing the flow of refrigerant in a cooler of a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments and modifications according to the present disclosure will be described with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. Note that the embodiments and modifications described below may be selectively combined as appropriate.

[0017] [First embodiment] 1 to 8, a power storage device 11 according to a first embodiment and a vehicle 10 including the power storage device 11 will be described. FIG. 1 is a side view that schematically shows a vehicle 10 that includes a power storage device 11 according to an embodiment of the present disclosure. FIG. 2 is a perspective view that schematically shows the power storage device 11 and a vehicle frame 101 according to this embodiment. FIG. 3 is a cross-sectional view that schematically shows how the power storage device 11 according to this embodiment is attached to the vehicle 10. FIG. 4 is a perspective view that schematically shows the configuration of the power storage device 11 according to this embodiment. FIG. 5 is a perspective view that shows the general shape of a power storage module 15 included in the power storage device 11 according to this embodiment. FIG. 6 is a plan view that schematically shows the interior of the power storage device 11 according to this embodiment. FIG. 7 is a diagram that illustrates the positional relationship between the flow of refrigerant in the cooler 14 according to this embodiment and the main bus bar 410. FIG. 8 is a diagram that illustrates the flow of refrigerant in the cooler 14 according to this embodiment.

[0018] 1 to 8, the forward direction, rearward direction, upward direction, downward direction, rightward direction, and leftward direction respectively refer to the forward, backward, upward, downward, rightward, and leftward directions of the vehicle 10. The axes of the forward, backward, upward, downward, and leftward directions are perpendicular to one another.

[0019] Vehicle 10 is an electrically powered vehicle. The electrically powered vehicle may be an electric vehicle (BEV: Battery Electric Vehicle), a plug-in hybrid electric vehicle (PHEV: Plug-in Hybrid Electric Vehicle), a hybrid vehicle (HEV: Hybrid Electric Vehicle), or a fuel cell electric vehicle (FCEV: Fuel Cell Electric Vehicle).

[0020] As shown in Fig. 1, vehicle 10 includes a vehicle frame 101 and an electricity storage device 11. Electricity storage device 11 is a device that can charge and discharge electric power for driving vehicle 10. Electricity storage device 11 is disposed below floor panel 4. However, without being limited to this, electricity storage device 11 may be mounted on the bottom of the body of vehicle 10 and form part of the floor of the vehicle interior.

[0021] As shown in FIG. 2 , the vehicle frame 101 includes a left roof rail 30, a right roof rail 31, a left side sill 32, a right side sill 33, a left first pillar 34, a left second pillar 35, a left third pillar 36, a right first pillar 37, a right second pillar 38, and a right third pillar 39.

[0022] The left roof rail 30 and the right roof rail 31 are disposed above the vehicle frame 101. The left roof rail 30 and the right roof rail 31 are disposed at a distance from each other in the left-right direction of the vehicle 10. The left roof rail 30 and the right roof rail 31 are disposed so as to extend in the front-rear direction of the vehicle 10.

[0023] The left side sill 32 and the right side sill 33 are disposed at the bottom of the vehicle frame 101. The left side sill 32 and the right side sill 33 are disposed at a distance from each other in the left-right direction of the vehicle 10. The left side sill 32 and the right side sill 33 are disposed so as to extend in the front-rear direction of the vehicle 10.

[0024] The left first pillar 34, the left second pillar 35, and the left third pillar 36 are disposed on the left side surface of the vehicle frame 101. The left first pillar 34 is disposed so as to connect the front end of the left side sill 32 and the front end of the left roof rail 30. The left second pillar 35 is disposed so as to connect the center portion of the left side sill 32 and the center portion of the left roof rail 30. The left third pillar 36 is disposed so as to connect the rear end of the left side sill 32 and the rear portion of the left roof rail 30. In other words, the left second pillar 35 is disposed rearward from and spaced apart from the left first pillar 34, and the left third pillar 36 is disposed rearward from and spaced apart from the left second pillar 35.

[0025] The right first pillar 37, the right second pillar 38, and the right third pillar 39 are disposed on the right side surface of the vehicle frame 101. The right first pillar 37 is provided to connect the front end of the right side sill 33 to the front end of the right roof rail 31. The right second pillar 38 is provided to connect the center of the right side sill 33 to the center of the right roof rail 31. The right third pillar 39 is provided to connect the rear end of the right side sill 33 to the rear portion of the right roof rail 31. In other words, the right second pillar 38 is disposed rearward from and spaced apart from the right first pillar 37, and the right third pillar 39 is disposed rearward from and spaced apart from the right second pillar 38. A floor panel 4 is provided between the left side sill 32 and the right side sill 33.

[0026] 3, the vehicle frame 101 further includes a left side member 41 and a right side member 42. The left side member 41 and the right side member 42 are disposed inside the left side sill 32 and the right side sill 33, with a distance between them in the left-right direction. The left side member 41 and the right side member 42 are disposed so as to extend in the front-rear direction of the vehicle 10.

[0027] A main body 45 of the power storage device 11 is disposed between the left side member 41 and the right side member 42. Gaps are provided between the main body 45 and the left side member 41 and the right side member 42. This makes it possible to suppress the input of impact to the power storage device 11 even in the event of a side collision of the vehicle 10.

[0028] Fixed portions 46 are provided on both side surfaces of a main body 45 of the power storage device 11 in the width direction of the vehicle 10. The fixed portions 46 are fixed to the left side member 41 and the right side member 42 by fastening members 8.

[0029] As shown in Figures 4 to 6, the storage device 11 includes an upper case 12, a lower case 13, a cooler 14, a plurality of storage modules 15, a reinforcing member 16, a main bus bar 410, inter-module bus bars 420, 430, a sub-bus bar 440 (see Figure 6), and a relay box 180.

[0030] The upper case 12 and the lower case 13 are formed of steel (for example, steel plate). The upper case 12 and the lower case 13 may be formed of other materials, such as resin. The upper case 12 and the lower case 13 are joined at their flanges (for example, fastened at the flanges with bolts and nuts) to form an integrated electricity storage device case 17. A space is formed inside the electricity storage device case 17. The upper case 12 is located above the lower case 13. The electricity storage device case 17 is attached to the vehicle 10 so that its thickness direction coincides with the up-down direction of the vehicle 10. The longitudinal direction and lateral direction of the electricity storage device case 17, which are perpendicular to the thickness direction, coincide with the front-rear direction and left-right direction of the vehicle 10, respectively. The longitudinal direction and lateral direction of the electricity storage device case 17 are several times longer than the thickness direction.

[0031] As shown in Fig. 5, the power storage module 15 is a module capable of charging and discharging power, and has a substantially rectangular parallelepiped shape. The longitudinal side of the power storage module 15 is several times longer than the shorter lateral side, which is the longer of the remaining two sides. The lateral side is several times longer than the shorter thickness side, which is the shorter of the remaining two sides. The longitudinal direction, lateral direction, and thickness direction of the power storage module 15 correspond to the left-right direction, up-down direction, and front-rear direction of the vehicle 10, respectively.

[0032] As shown in FIGS. 4 and 6 , the power storage module 15 is stored in the internal space of the power storage device case 17. The power storage module 15 is stored so that its longitudinal direction, lateral direction, and thickness direction respectively coincide with the lateral direction, thickness direction, and longitudinal direction of the power storage device case 17. The multiple power storage modules 15 are stored so that they are stacked in the thickness direction. The reinforcing member 16 is a member that reinforces the lower case 13, has approximately the same external shape as the power storage module 15, and is attached to the lower case 13 in the middle in the longitudinal direction. In other words, the reinforcing member 16 is provided in the middle of the power storage module 15 in the direction in which the power storage modules 15 are stacked.

[0033] As shown in FIG. 5 , the energy storage module 15 includes at least one energy storage cell (not shown) housed therein, a module case 300, and an external terminal 400. The energy storage cell is a lithium-ion battery. However, the energy storage cell is not limited to this, and may be other types of secondary batteries, such as solid-state batteries. The module case 300 includes a case body 310 and a lid 320. The case body 310 and the lid 320 are made of a material such as aluminum. The case body 310 has a generally rectangular parallelepiped shape with a hollow center in the longitudinal direction. The lid 320 has a rectangular flat plate shape that closes the opening of the case body 310. The outer shapes of the case body 310 and the lid 320 form part of the outer shape of the energy storage module 15 described above. The lid 320 is joined to the case body 310 by welding so as to close the opening of the case body 310. The joining method is not limited to this, and other methods, such as using an adhesive, may also be used.

[0034] As shown in FIGS. 4 to 6 , external terminals 400 are provided on the lids 320 at both ends in the longitudinal direction of the energy storage module 15. One of the external terminals 400 at both ends is a positive terminal, and the other is a negative terminal. The energy storage module 15 is placed in the energy storage device case 17 so that the external terminals 400 of the positive and negative terminals are arranged alternately. The inter-module bus bars 420, 430 are conductor bars capable of passing a large amount of current, and are made of a material such as copper. Adjacent external terminals 400 of the positive and negative terminals are electrically connected by the inter-module bus bar 420. Adjacent external terminals 400 of the positive and negative terminals across the reinforcing member 16 are electrically connected by the inter-module bus bar 430, the hole of which is longer than that of the inter-module bus bar 420. External terminals 400 are inserted into holes formed in inter-module bus bars 420, 430, and inter-module bus bars 420, 430 are fastened between male screws formed on external terminals 400 and nuts 421 so as to sandwich inter-module bus bars 420, 430. This fixes inter-module bus bars 420, 430 to power storage modules 15. This electrically connects multiple power storage modules 15 inside power storage device case 17 in series.

[0035] The relay box 180 is provided at a position near the front end of the lower case 13 adjacent to the power storage modules 15. The relay box 180 includes positive and negative relays for electrically connecting and disconnecting the plurality of series-connected power storage modules 15 to the outside of the power storage device 11, and electrical devices such as sensors for measuring the voltage, current, temperature, etc. of the power storage modules 15. The relay box 180 is provided with a positive bus bar connection terminal 181, a negative bus bar connection terminal 182, a positive external terminal 183, and a negative external terminal 184. The positive bus bar connection terminal 181 and the positive external terminal 183 are connected via a positive relay inside the relay box 180. The negative bus bar connection terminal 182 and the negative external terminal 184 are connected via a negative relay inside the relay box 180.

[0036] The main bus bar 410 and the sub-bus bar 440 are conductor bars capable of carrying a large amount of current, and are made of a material such as copper. A connector 411 at one end of the main bus bar 410 is connected to a bus bar connection terminal 181. The other end of the main bus bar 410 is connected to an external terminal 400A (see FIG. 6) which is the common positive terminal at the end of the plurality of power storage modules 15 connected in series. A connector 441 at one end of the sub-bus bar 440 (see FIG. 6) is connected to a bus bar connection terminal 182. The other end of the sub-bus bar 440 is connected to an external terminal 400B (see FIG. 6) which is the common negative terminal at the end of the plurality of power storage modules 15 connected in series. The main bus bar 410 and the sub-bus bar 440 are covered with an insulator such as resin except for the connection portions.

[0037] The cooler 14 is a device that adjusts the temperature of the power storage modules 15 by cooling them. The cooler 14 may be changed to a temperature adjustment device that has a function of heating the power storage modules 15 in addition to the cooling function. As shown in FIG. 4 , the cooler 14 is formed in a substantially flat plate shape. The longitudinal and lateral directions of the cooler 14 are shorter than and coincide with the longitudinal and lateral directions of the inner surfaces of the upper case 12 and the lower case 13, respectively. The cooler 14 is attached to the multiple power storage modules 15, for example, with an adhesive, so that the surface defined by the longitudinal and lateral directions of the cooler 14 contacts the surface defined by the thickness and longitudinal directions of the multiple power storage modules 15. Note that the method of attaching the cooler 14 to the multiple power storage modules 15 is not limited to adhesive, and other methods may also be used. The cooler 14 is housed in the internal space of the power storage device case 17 together with the multiple power storage modules 15.

[0038] 7, cooler 14 is provided inside with flow passage 143 through which a refrigerant (for example, cooling water) flows to cool power storage module 15. A pump (not shown) external to cooler 14 supplies the refrigerant from supply unit 141 to flow passage 143. The refrigerant that has flowed through flow passage 143 is discharged from discharge unit 142. The refrigerant discharged from discharge unit 142 is air-cooled in a radiator (not shown) and then supplied to supply unit 141.

[0039] As shown in FIG. 8, the refrigerant that flows in from supply unit 141 flows from the front end side to the rear end side of cooler 14. Then, the refrigerant branches into left and right at the rear end side of cooler 14, and branches into multiple paths (four in FIG. 8) on each of the left and right sides of the rear end side of cooler 14. The refrigerant flows from the rear end side to the front end side of cooler 14 through each of the branched paths. Then, the refrigerant merges from the multiple paths branched on the left and right sides into one path, and is discharged from discharge unit 142 through each of the left and right paths. This allows the refrigerant flowing through cooler 14 to entirely cool the power storage modules 15 inside power storage device case 17.

[0040] A large current flows through main bus bar 410, so main bus bar 410 is prone to becoming hot. When main bus bar 410 becomes hot, main bus bar 410 may deform in the direction of extension, which may result in a large load being applied to the connection between connector 411 at one end of main bus bar 410 and bus bar connection terminal 181, and to the connection between the other end of main bus bar 410 and external terminal 400A.

[0041] 7, the flow path 143 includes an introduction portion 148 extending from the connection portion with the supply portion 141. The main bus bar 410 includes an overlapping portion 412 extending to overlap with the introduction portion 148.

[0042] As a result, main bus bar 410 is provided so as to overlap at least a portion of introduction portion 148, through which a refrigerant that is cooler than the portion other than introduction portion 148 of flow passage 143 flows. The portion of main bus bar 410 above cooler 14 is provided so as to be in close contact with the front surface of cooler 14 opposite to the back surface that contacts power storage module 15. This allows main bus bar 410 to be cooled well. As a result, main bus bar 410 is less likely to deform.

[0043] 6, the main bus bar 410 is provided at a position separated from all the inter-module bus bars 420, 430. Specifically, the separated position means, for example, a position where the main bus bar 410 and the inter-module bus bars 420, 430 are separated from each other by at least the distance between the centers of the two holes of the inter-module bus bar 420. This allows the main bus bar 410 and the inter-module bus bars 420, 430 to be disposed at a distance from each other. As a result, contact between the main bus bar 410 and the inter-module bus bars 420, 430 can be prevented. Note that the distance between the main bus bar 410 and the inter-module bus bar 420 connected to the external terminal 400 closest to the external terminal 400A to which the main bus bar 410 is connected is an exception, that is, the distance between the main bus bar 410 and the inter-module bus bar 420 is less than the distance between the centers of the two holes of the inter-module bus bar 420.

[0044] 6, the sub-bus bar 440 is provided at a position separated from the main bus bar 410. Specifically, the separated position means, for example, a position at which the two are separated by at least the distance between the bus bar connection terminal 182 and the external terminal 400B to which the sub-bus bar 440 is connected. This allows the main bus bar 410 and the sub-bus bar 440 to be disposed at a distance from each other. As a result, contact between the main bus bar 410 and the sub-bus bar 440 can be prevented.

[0045] As shown in FIG. 7, the flow path 143 may include a discharge portion 149 that is connected to the discharge section 142, and the main bus bar 410 may not include a portion that overlaps with the discharge portion 149.

[0046] This prevents main bus bar 410 from overlapping with discharge portion 149, through which refrigerant flows that is at a higher temperature than the portion other than discharge portion 149 of flow passage 143. This prevents the temperature of main bus bar 410 from rising. As a result, main bus bar 410 is less likely to deform.

[0047] [Second embodiment] In the first embodiment, as shown in Figures 7 and 8, the supply unit 141 and the discharge unit 142 are provided at the front end of the cooler 14. In the second embodiment, as shown in Figure 9, the supply unit 141A and the discharge unit 142A are provided at the rear end of the cooler 14A.

[0048] Fig. 9 is a diagram showing the flow of refrigerant in a cooler 14A according to the second embodiment. Referring to Fig. 9, in the second embodiment, a supply section 141A and a discharge section 142A of the cooler 14A are provided on the rear end side of the cooler 14A.

[0049] As shown in Fig. 9, the refrigerant flowing in from the supply unit 141A flows from the rear end side to the front end side of the cooler 14A. The refrigerant branches into left and right paths near the middle and the front end side of the cooler 14A. After that, the refrigerant passes through the spiral path shown in Fig. 9, and the two paths branching off to the left and right merge into one path, and is discharged from the discharge unit 142A via the left and right paths. This allows the refrigerant flowing through the cooler 14A to entirely cool the power storage modules 15 inside the power storage device case 17.

[0050] Flow path 143A includes introduction portion 148A extending from the connection portion with supply portion 141 A. Main bus bar 410 includes overlapping portion 412A extending to overlap introduction portion 148A.

[0051] As a result, main bus bar 410 is provided so as to overlap at least a portion of introduction portion 148A, through which a refrigerant that is cooler than the portion other than introduction portion 148A of flow path 143A flows. The portion of main bus bar 410 above cooler 14A is provided so as to be in close contact with the front surface of cooler 14A opposite to the back surface that contacts power storage module 15. This allows main bus bar 410 to be cooled well. As a result, main bus bar 410 is less likely to deform.

[0052] [Variations] (1) The number of power storage modules 15 in the above-described embodiment may be more or less than the number shown in Fig. 4 and Fig. 6. Furthermore, a plurality of power storage modules 15 of the power storage device 11 may be integrated into one power storage module. In this case, the power storage module has two external terminals: external terminal 400A, which is the above-described total positive terminal, and external terminal 400B, which is the above-described total negative terminal.

[0053] (2) In the above-described embodiment, the positive and negative electrodes may all be opposite polarities.

[0054] (3) The path of the flow passage 143 is not limited to the paths shown in Figures 7 to 9, and may be another path as long as it includes overlapping portions 412, 412A where the main bus bar 410 extends to overlap with the introduction portions 148, 148A. Furthermore, it is preferable that the other path does not include a portion where the main bus bar 410 overlaps with the discharge portion 149.

[0055] (4) In the above-described embodiment, the connection device is the relay box 180. However, this is not limiting, and the connection device may be other devices, for example, devices that do not have a relay.

[0056] [summary] (1) As shown in FIGS. 4 to 6 , the power storage device 11 includes a storage battery (e.g., one or more storage modules 15) including a connection terminal (e.g., external terminal 400), a relay box 180 provided adjacent to the storage battery, a cooler 14, 14A provided in contact with the storage battery, and a main bus bar 410 provided on the opposite side of the cooler 14, 14A from the storage battery and connected to the connection terminal and the relay box 180. As shown in FIGS. 7 to 9 , the cooler 14, 14A includes a supply unit 141, 141A to which a refrigerant is supplied and a flow path 143, 143A through which the refrigerant flows. As shown in FIGS. 7 and 9 , the flow path 143, 143A includes an introduction portion 148, 148A extending from a connection portion with the supply unit 141, 141A. As shown in FIGS. 7 and 9, the main bus bar 410 includes overlapping portions 412, 412A that extend to overlap the leading portions 148, 148A.

[0057] As a result, main bus bar 410 is provided so as to at least partially overlap introduction portions 148, 148A through which a refrigerant that is cooler than the portions other than the introduction portions of flow passages 143, 143A flows, thereby enabling efficient cooling of main bus bar 410. As a result, main bus bar 410 is less likely to deform.

[0058] (2) As shown in FIGS. 4 and 6, the storage battery is composed of a plurality of power storage modules 15. As shown in FIGS. 4 to 6, the plurality of power storage modules 15 each have a positive terminal (for example, the positive external terminal 400) and a negative terminal (for example, the negative external terminal 400), are capable of charging and discharging power, and are electrically connected in series. As shown in FIG. 6, the connection terminals are composed of a collective positive terminal (for example, the external terminal 400A) and a collective negative terminal (for example, the external terminal 400B). As shown in FIG. 6, the collective positive terminal is the positive terminal at the end of the series connection of the power storage modules 15. As shown in FIG. 6, the collective negative terminal is the negative terminal at the end of the series connection of the power storage modules 15. As shown in FIGS. 1 to 9, the first direction (for example, the front-rear direction), the second direction (for example, the up-down direction), and the third direction (for example, the left-right direction) are perpendicular to one another. As shown in FIGS. 4 to 6 , the power storage modules 15 are longer in the third direction than in the first and second directions, and have a positive terminal and a negative terminal at each end in the third direction. As shown in FIGS. 4 and 6 , the multiple power storage modules 15 are arranged in the first direction such that the positive terminals and negative terminals of two adjacent power storage modules 15 are alternately arranged at one end in the third direction. As shown in FIGS. 4 to 6 , the power storage device 11 further includes multiple inter-module bus bars 420, 430 that respectively connect the positive terminal and the negative terminal of two adjacent power storage modules 15 so that all of the multiple power storage modules 15 are connected in series. As shown in FIGS. 4 and 6 , the relay box 180 includes a first terminal (e.g., a positive bus bar connection terminal 181) and a second terminal (e.g., a negative bus bar connection terminal 182). As shown in Figures 4 and 6, the main bus bar 410 connects a first terminal to either the total positive terminal or the total negative terminal, whichever is further from the relay box 180 (for example, the external terminal 400A, which is the total positive terminal in Figures 4 and 6), and is provided at a position away from the multiple inter-module bus bars 420, 430.

[0059] This allows main bus bar 410 to be spaced apart from inter-module bus bars 420, 430. As a result, contact between main bus bar 410 and inter-module bus bars 420, 430 can be prevented.

[0060] (3) As shown in Figure 6, a sub-bus bar 440 is further provided that connects the second terminal to either the total positive terminal or the total negative terminal that is not connected to the first terminal (for example, external terminal 400B, which is the total negative terminal in Figures 4 and 6), and the sub-bus bar 440 is located at a position away from the main bus bar 410.

[0061] This allows the main bus bar 410 and the sub-bus bar 440 to be spaced apart from each other, thereby preventing the main bus bar 410 and the sub-bus bar 440 from coming into contact with each other.

[0062] (4) As shown in Figures 7 and 8, the cooler 14 may further include an outlet 142 from which the refrigerant is discharged, the flow passage 143 may include an outlet portion 149 connected to the outlet portion 142, and the main bus bar 410 may not include a portion that overlaps with the outlet portion 149.

[0063] This prevents main bus bar 410 from overlapping with discharge portion 149, through which refrigerant flows that is at a higher temperature than the portion other than discharge portion 149 of flow passage 143. This prevents the temperature of main bus bar 410 from rising. As a result, main bus bar 410 is less likely to deform.

[0064] It should be noted that the embodiments disclosed herein are illustrative in all respects and should not be considered limiting. The scope of the present disclosure is defined by the claims rather than the description of the above embodiments, and further includes all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0065] 4 floor panel, 8 fastening member, 10 vehicle, 11 power storage device, 12 upper case, 13 lower case, 14, 14A cooler, 15 power storage module, 16 reinforcing member, 17 power storage device case, 30 left roof rail, 31 right roof rail, 32 left side sill, 33 right side sill, 34 left first pillar, 35 left second pillar, 36 left third pillar, 37 right first pillar, 38 right second pillar, 39 right third pillar, 41 left side member, 42 right side member, 45 main body portion, 46 fixed portion, 101 vehicle frame, 141, 141A supply portion, 142, 142A discharge portion, 143, 143A circulation passage, 148, 148A introduction portion, 149 discharge portion, 180 Relay box, 181, 182 bus bar connection terminals, 183, 184, 400, 400A, 400B external terminals, 300 module case, 310 case body, 320 lid, 410 main bus bar, 411, 441 connector, 412, 412A overlapping portion, 420, 430 inter-module bus bar, 421 nut, 440 sub-bus bar.

Claims

1. a storage battery including a connection terminal; a connection device provided adjacent to the storage battery; a cooler provided in contact with the storage battery; a main bus bar that is provided on the opposite side of the cooler from the storage battery and is connected to the connection terminal and the connection device; the cooler includes a supply portion to which a refrigerant is supplied and a flow passage through which the refrigerant flows, the flow passage includes an introduction portion extending from a connection portion with the supply portion, The main bus bar includes an overlapping portion that extends to overlap the introduction portion.

2. The storage battery is composed of a plurality of storage modules, each of the plurality of power storage modules has a positive terminal and a negative terminal, is capable of charging and discharging power, and is electrically connected in series; The connection terminals are composed of a total positive terminal and a total negative terminal, the common positive terminal is the positive terminal at the end of the series connection of the storage modules, the total negative electrode terminal is the negative electrode terminal at the end of the series connection of the storage modules, the first direction, the second direction, and the third direction are perpendicular to each other; the energy storage module is longer in the third direction than in the first direction and the second direction, and has the positive electrode terminal and the negative electrode terminal at both ends in the third direction, respectively; the plurality of energy storage modules are arranged in the first direction such that the positive electrode terminals and the negative electrode terminals of two adjacent energy storage modules are arranged alternately at one end in the third direction; further comprising a plurality of inter-module bus bars respectively connecting the positive electrode terminal and the negative electrode terminal of each of two adjacent energy storage modules such that all of the plurality of energy storage modules are connected in series; the connection device includes a first terminal and a second terminal; 2. The energy storage device according to claim 1, wherein the main bus bar connects the first terminal to one of the total positive terminal and the total negative terminal that is farther from the connected device, and is provided at a position distant from the plurality of inter-module bus bars.

3. a sub-bus bar connecting the second terminal to one of the total positive terminal and the total negative terminal that is not connected to the first terminal; The power storage device according to claim 2 , wherein the sub-bus bar is provided at a position separated from the main bus bar.

4. The cooler further includes a discharge portion through which the refrigerant is discharged, the flow passage includes a discharge portion connected to the discharge part, The power storage device according to claim 1 , wherein the main bus bar does not include a portion that overlaps with the discharge portion.

Images