Power storage device

Abstract

To suppress input of an external force from a protection plate 500 to power storage modules 15.SOLUTION: A power storage device 11 comprises the plurality of power storage modules 15 capable of charging / discharging power, a power storage device case 17 in which the plurality of power storage modules 15 is accommodated, and the protection plate 500 which is disposed outside of a bottom face of the power storage device case 17. The protection plate 500 includes a connection part (rib 501) which is connected to the power storage device case 17. At least one of rigidity and strength of the connection part is higher than that of a portion, which is positioned around the connection part, in the protection plate 500. Therefore, in relative to a case where the portion of the protection plate 500 which is positioned around the connection part is connected to the power storage device case 17, input of an external force, which is inputted to the protection plate 500, to the power storage device case 17 in which the power storage modules 15 are accommodated can be suppressed.SELECTED DRAWING: Figure 6

Description

[Technical Field]

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

[0002] Conventionally, there has been a long secondary battery storage module in which a plurality of laminated battery cells, each having an electrode formed on both longitudinal ends, are connected in series in the longitudinal direction and enclosed in a long case. For example, in Patent Document 1, the plurality of battery cells are connected in series with the laminate film removed. A battery pack in which such long storage modules are stacked in the thin-wall direction is disclosed, for example, in Figure 18 of Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2023-502698 Summary of the Invention [Problem to be solved by the invention]

[0004] In such a long energy storage module, the case is more likely to deform due to external forces such as vibrations than in a non-long energy storage module. For this reason, it is necessary to suppress the input of external forces from the protective plate located on the outside of the bottom surface of the storage case to the energy storage module via the storage case.

[0005] This disclosure has been made to solve the above-mentioned problems, and its purpose is to provide an energy storage device that can suppress the input of external force from the protective plate to the energy storage module. [Means for solving the problem]

[0006] The power storage device according to the present disclosure includes a plurality of power storage modules capable of charging and discharging power, a housing case that houses the plurality of power storage modules, and a protective plate disposed on the outer side of the lower surface of the housing case. The protective plate includes a connection portion connected to the housing case. The connection portion has at least one of rigidity and strength greater than a portion of the protective plate located around the connection portion.

[0007] According to this configuration, the connection portion of the protective plate, which has at least one of rigidity and strength greater than the portion of the protective plate located around the connection portion, is connected to the housing case that houses the energy storage module. Therefore, compared to when the portion of the protective plate located around the connection portion is connected to the housing case, it is possible to suppress the input of external force to the protective plate into the housing case that houses the energy storage module. As a result, it is possible to provide an energy storage device that can suppress the input of external force from the protective plate to the energy storage module.

[0008] The accommodating case may include a fixing portion that is connected to the connecting portion of the protective plate, and the energy storage module may be fixed to a portion of the inner surface of the accommodating case that is located above the fixing portion.

[0009] According to this configuration, the fixing portion of the accommodating case is connected to the connecting portion of the protective plate, which has at least one of rigidity and strength higher than the portion of the protective plate located around the connecting portion. Therefore, compared to when the accommodating case is connected to the portion of the protective plate located around the connecting portion, it is possible to suppress the input of external force to the fixing portion of the accommodating case, inside which the energy storage module is housed, of the protective plate. As a result, it is possible to suppress the input of external force from the protective plate to the energy storage module.

[0010] The battery pack may further include an adhesive for bonding each of the plurality of power storage modules to the accommodating case, and the adhesive may be provided on a portion of the inner surface of the accommodating case that is located above the fixing portion.

[0011] With this configuration, the energy storage module is adhered with adhesive to the portion located above the fixing part, which allows the energy storage module to be more securely fixed to a sturdy portion of the casing, compared to when the energy storage module is adhered to a portion of the casing different from the portion located above the fixing part.

[0012] Each of the multiple storage modules includes multiple storage cells including a first storage cell and a second storage cell arranged in one direction, a connecting portion, and a module case that houses the multiple storage cells and the connecting portion, wherein the first storage cell includes a first end adjacent to the second storage cell and a first terminal provided at the first end, and the second storage cell includes a second end adjacent to the first storage cell and a second terminal provided at the second end, the connecting portion is formed by connecting the first terminal and the second terminal, and the storage module may be fixed to the storage case at a portion of the outer surface of the module case that is located outside the connecting portion.

[0013] With this configuration, the energy storage module is fixed to the accommodating case at a portion of the outer surface of the module case of the energy storage module that is located outside the connecting portion where the first terminal of the first energy storage cell and the second terminal of the second energy storage cell are connected, thereby making it possible to effectively fix the connecting portion to the accommodating case.

[0014] The module case may include a top plate and a bottom plate arranged in the vertical direction, and each of the energy storage modules may include a partition member provided within the module case and at the connecting portion, and the partition member may be arranged across the top plate and the bottom plate.

[0015] According to this configuration, the connecting portion of the electricity storage module fixed to the storage case can be made sturdy by the partition member.

[0016] The protective plate may include a plate-shaped main body and a rib formed to protrude upward from the main body, and the connecting portion may be the rib.

[0017] This makes it possible to make the connection portion of protection plate 500 that is connected to power storage device case 17 strong. In addition, protection plate 500 itself can be made strong. [Effects of the Invention]

[0018] According to this disclosure, it is possible to provide an electricity storage device that can suppress input of external force from the protective plate to the electricity storage module. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a side view showing the general shape of a vehicle according to an embodiment of the present disclosure. [Figure 2] 1 is a perspective view showing an outline of the configuration of an electricity storage device mounted on a vehicle according to an embodiment of the present invention; [Figure 3] 1 is a perspective view showing the general shape of a power storage module included in the power storage device of this embodiment. [Figure 4] FIG. 2 is an exploded perspective view of the storage module according to the embodiment. [Figure 5] FIG. 2 is an exploded perspective view of a storage cell included in the storage module of this embodiment. [Figure 6] FIG. 2 is a cross-sectional view of the electricity storage device taken along the line AA of this embodiment. [Figure 7] FIG. 3 is a cross-sectional view of the storage module of this embodiment taken along the line BB. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present disclosure will be described with reference to the accompanying drawings, in which the same or corresponding parts are designated by the same reference numerals.

[0021] FIG. 1 is a side view showing the general shape of a vehicle 10 according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing the general configuration of a power storage device 11 mounted on vehicle 10 according to this embodiment. FIG. 3 is a perspective view showing the general shape of a power storage module 15 included in power storage device 11 according to this embodiment. FIG. 4 is an exploded perspective view of power storage module 15 according to this embodiment. FIG. 5 is an exploded perspective view of a power storage cell 100 included in power storage module 15 according to this embodiment. FIG. 6 is a cross-sectional view of power storage device 11 according to this embodiment taken along line AA. FIG. 7 is a cross-sectional view of power storage module 15 according to this embodiment taken along line BB.

[0022] 1 to 7, 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.

[0023] 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). As shown in FIG. 1 , vehicle 10 includes a power storage device 11. Power storage device 11 is a device that can charge and discharge power for driving vehicle 10. Power storage device 11 is mounted on the bottom of the body of vehicle 10 and forms part of the floor of the passenger compartment. However, the present invention is not limited to this, and power storage device 11 may also be mounted under the floor of the passenger compartment.

[0024] As shown in FIG. 2, the electricity storage device 11 includes an upper case 12, a lower case 13, a temperature adjustment device 14, a plurality of electricity storage modules 15, and a reinforcing member 16.

[0025] The upper case 12 and the lower case 13 are made of steel (for example, steel plate). 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.

[0026] As shown in Fig. 3, 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.

[0027] As shown in FIG. 2, 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.

[0028] The temperature adjustment device 14 adjusts the temperature of the power storage modules 15 by heating or cooling the power storage modules 15. As shown in FIG. 2 , the temperature adjustment device 14 is formed in a substantially flat plate shape. The longitudinal and lateral directions of the temperature adjustment device 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 temperature adjustment device 14 is attached to the multiple power storage modules 15, for example, with an adhesive, so that the surface formed by the longitudinal and lateral directions of the temperature adjustment device 14 contacts the surface formed by the thickness and longitudinal directions of the multiple power storage modules 15. Note that the temperature adjustment device 14 may be attached to the multiple power storage modules 15 by other methods than adhesive. The temperature adjustment device 14 is housed in the internal space of the power storage device case 17 together with the multiple power storage modules 15.

[0029] As shown in FIGS. 3 and 4, the energy storage module 15 includes a plurality of energy storage cells 100 (energy storage cells 100A and 100B in FIG. 4, and energy storage cells 100A to 100C in FIG. 6), a module case 300, and an external terminal 400. 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 that is hollow 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.

[0030] The energy storage cell 100 is a lithium-ion battery. However, the present invention is not limited to this, and the energy storage cell 100 may be configured as another type of secondary battery, such as an all-solid-state battery. As shown in FIG. 4 , the energy storage cell 100 has an outer shape of a substantially rectangular parallelepiped. The plurality of energy storage cells 100 are arranged in a row such that the longitudinal direction of the energy storage cells 100 coincides with the longitudinal direction of the module case 300, and are housed inside the module case 300. The energy storage cell 100 has current collecting terminals 140 at both ends in the longitudinal direction. The current collecting terminal 140 provided at one end of the energy storage cell 100 in the longitudinal direction is a positive terminal, and the current collecting terminal 140 provided at the other end is a negative terminal. Adjacent energy storage cells 100 are electrically connected to each other via their current collecting terminals 140 (one is a positive terminal, the other is a negative terminal), thereby forming a connection portion 190 of the energy storage cells 100.

[0031] 3 and 4, the 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 electrode terminal, and the other is a negative electrode terminal. The positive electrode external terminal 400 is electrically connected to the positive electrode current collector terminal 140 of the energy storage cell 100 closest to the positive electrode external terminal 400, thereby forming a connecting portion 180. The negative electrode external terminal 400 is electrically connected to the negative electrode current collector terminal 140 of the energy storage cell 100 closest to the negative electrode external terminal 400, thereby forming a connecting portion 170.

[0032] 4, 5, and 7, the energy storage cell 100 has at least one electrode assembly 110, an interposition member 120, a conductive film 130, a current collecting terminal 140, a cover 150, and a laminated outer casing 160. Note that while the energy storage cell 100A in FIG. 4 and FIG. 7 show the laminated outer casing 160, the energy storage cell 100B in FIG. 4 and FIG. 5 do not show the laminated outer casing 160.

[0033] In this embodiment, the energy storage cell 100 has two electrode assemblies 110. However, the number of electrode assemblies 110 included in the energy storage cell 100 is not limited to two. The electrode assembly 110 is formed of a wound assembly in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, the electrode assembly 110 may also be formed of a laminate in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The two electrode assemblies 110 are adjacent to each other in the stacking direction (front-to-back direction in FIG. 5) in which the positive electrode sheet and the negative electrode sheet are stacked on top of each other. The electrode assembly 110 is formed in a shape that is elongated in the left-to-right direction in FIG. 5.

[0034] The electrode body 110 has a coated portion 112 and an electrode tab 114. The coated portion 112 is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where an active material layer is provided. The electrode tab 114 is a region of the electrode foil on the positive electrode sheet or negative electrode sheet where an active material layer is not provided, i.e., an uncoated portion where the electrode foil is exposed.

[0035] The interposing member 120 is disposed between a pair of adjacent electrode tabs 114. The interposing member 120 is made of an insulating material (e.g., synthetic resin). As shown in Figures 3 and 5, the interposing member 120 has a spacer portion 122 and a support portion 124.

[0036] The spacer portion 122 is adjacent to the boundary between a pair of adjacent coated portions 112 in the perpendicular direction, and is adjacent to a pair of adjacent electrode tabs 114 in the stacking direction. The spacer portion 122 has a shape such that the dimension in the stacking direction gradually increases with increasing distance from the boundary between the pair of coated portions 112 in the perpendicular direction. The spacer portion 122 is formed in a substantially triangular prism shape.

[0037] The support portions 124 support the respective electrode tabs 114. The support portions 124 protrude outward in the orthogonal direction from the spacer portions 122. The support portions 124 are formed integrally with the spacer portions 122 using the same material as the spacer portions 122. The support portions 124 are formed in a substantially quadrangular prism shape.

[0038] The conductive film 130 is made of a metal (for example, copper or aluminum). The conductive film 130 is provided on the surface of the interposition member 120. The conductive film 130 is connected to each electrode tab 114. The conductive film 130 has a pair of connection base portions 132 and a connecting portion 134.

[0039] Each connection base 132 is a portion that is connected to an electrode tab 114. Each connection base 132 is provided between the support portion 124 and the electrode tab 114. Each connection base 132 covers the outer surface of the support portion 124 in the stacking direction.

[0040] The connecting portion 134 connects the pair of connection bases 132. The connecting portion 134 covers the outer surface of the support portion 124 in the orthogonal direction. The thickness of the connecting portion 134 may be the same as or different from the thickness of each connection base 132.

[0041] The current collecting terminal 140 is connected to the conductive film 130. The current collecting terminal 140, which is electrically connected to the positive electrode tab 114 via the conductive film 130, is made of, for example, aluminum. The current collecting terminal 140, which is electrically connected to the negative electrode tab 114 via the conductive film 130, is made of, for example, copper. The current collecting terminal 140 has a connecting portion 142 and a protruding portion 144.

[0042] The connection portion 142 is connected to the coupling portion 134 by welding, but may be connected by other methods such as soldering. The connection portion 142 is formed in a flat plate shape. The thickness of the connection portion 142 may be greater than the thickness of the conductive film 130.

[0043] The protrusion 144 protrudes outward in the perpendicular direction from the connection portion 142. The protrusion 144 is formed in a flat plate shape. The thickness of the protrusion 144 may be greater than the thickness of the conductive film 130. As shown in FIG. 4, the protrusion 144 of the current collector terminal 140 of the energy storage cell 100A is connected to the protrusion 144 of the current collector terminal 140 of the adjacent energy storage cell 100B.

[0044] The cover 150 covers the longitudinal ends of the electrode body 110, more specifically, the electrode tabs 114. The cover 150 is made of an insulating material (for example, synthetic resin). As shown in Figures 4, 5 and 7, the cover 150 is provided with a through-hole h through which the protrusion 144 is inserted.

[0045] The laminated exterior housing 160 houses the two electrode assemblies 110, the interposing member 120, the conductive film 130, a portion of the current collecting terminal 140, and the cover 150. The laminated exterior housing 160 is made of a laminated film. As shown in FIG. 7 , the laminated exterior housing 160 has an edge portion 162. The edge portion 162 is formed by connecting (welding) the laminated films together. The protrusion 144 protrudes outward from the edge portion 162 of the laminated exterior housing 160 in the longitudinal direction of the energy storage cell 100.

[0046] In a long electricity storage module 15 as described above, the module case 300 is more likely to deform under the action of external forces such as vibrations than in a non-long electricity storage module. For this reason, it is necessary to suppress input of external forces to the electricity storage module 15 via the electricity storage device case 17 from a protective plate 500 (also referred to as a "share panel") shown in FIG. 6 that is arranged on the outside of the lower surface of the electricity storage device case 17.

[0047] Therefore, the protective plate 500 includes a rib 501 connected to the electricity storage device case 17. The rib 501 has at least one of rigidity and strength higher than that of the portion of the protective plate 500 located around the rib 501. A highly rigid portion is a portion that is less likely to deform when a force is applied. A highly strong portion is a portion that is less likely to break when a force is applied.

[0048] As a result, the ribs 501 of the protective plate 500, which have at least one of rigidity and strength higher than the portion of the protective plate 500 positioned around the ribs 501, are connected to the power storage device case 17 that houses the power storage module 15 therein. Therefore, compared to when the portion of the protective plate 500 positioned around the ribs 501 is connected to the power storage device case 17, it is possible to suppress the input of external force input to the protective plate 500 to the power storage device case 17 that houses the power storage module 15 therein. As a result, it is possible to suppress the input of external force from the protective plate 500 to the power storage module 15.

[0049] As shown in FIGS. 4, 6, and 7, partition members 610, 620 are provided at the connecting portions 170, 180, 190 of the energy storage cells 100 so as to sandwich the connection portions of the collector terminals 140 on both sides or the connection portions between the collector terminals 140 and the external terminals 400. The partition members 610, 620 are rectangular prisms that are hollow in the vertical direction, which is the longitudinal direction. The partition members 610, 620 may be made of synthetic resin or metal. The case body 310 of the module case 300 is composed of a top plate and a bottom plate that are perpendicular to the vertical direction and two side plates that are perpendicular to the front-rear direction. The longitudinal length of the partition members 610, 620 is the same as the width of the inner surfaces of the top plate and bottom plate of the case body 310. As a result, the partition members 610 and 620 function as reinforcing members (so-called support rods) between the top plate and the bottom plate of the connecting portions 170, 180, and 190 of the case body 310.

[0050] The outer surface of the case body 310 of the module case 300 below the connecting portions 170, 180, and 190 and the inner surface of the lower case 13 of the power storage device case 17 are joined with adhesive at the adhesive joint 330. As a result, the power storage module 15 is fixed to the power storage device case 17 below the connecting portions 170, 180, and 190 with the adhesive.

[0051] The electricity storage device 11 further includes a reinforcement 510 (also referred to as "reinforcement"). The reinforcement 510 is provided below the connecting portions 170, 180, and 190. The reinforcement 510 is made of steel (for example, a steel plate). The reinforcement 510 is joined to the lower case 13 of the electricity storage device case 17 by welding. The reinforcement 510 is provided across the width of the lower case 13 in the longitudinal direction.

[0052] The power storage device 11 further includes a protective plate 500. The protective plate 500 is provided below the lower case 13 of the power storage device case 17. The protective plate 500 is formed of a steel material (for example, a steel plate). A rib 501 is provided below the connecting portions 170, 180, and 190 of the protective plate 500 across the width of the lower case 13 in the longitudinal direction. The portion of the protective plate 500 where the rib 501 is located is configured to have higher rigidity and strength than the portion located around the rib 501. The rib 501 is used as a connection portion with the reinforcement 510. The rib 501 and the reinforcement 510 are fastened together at the connection portion with bolts and nuts. However, the present invention is not limited to this, and the rib 501 and the reinforcement 510 may be joined together by other methods, for example, welding or adhesive bonding.

[0053] [Variations] (1) In the above-described embodiment, as shown in Fig. 6, the module case 300 of the energy storage module 15 includes three energy storage cells 100. However, the number of energy storage cells 100 included in the module case 300 is not limited to this, and may be two, or four or more.

[0054] (2) In the embodiment described above, as shown in Fig. 6, the power storage device case 17 is provided with the reinforcement 510 as a fixing portion that is connected to the connecting portion of the protective plate 500. However, this is not limited thereto, and the fixing portion may be provided in the power storage device case 17 itself. In other words, the power storage device case 17 and the protective plate 500 may be joined together without the reinforcement 510.

[0055] (3) In the embodiment described above, as shown in Fig. 6, the connection portion of protective plate 500 connected to power storage device case 17 is formed by rib 501. However, the present invention is not limited to this, and such a connection portion may have a structure different from rib 501 as long as it has a structure that is higher in at least one of rigidity and strength than the portion of protective plate 500 located around the connection portion. For example, the connection portion may have a structure in which a reinforcing member is welded to protective plate 500.

[0056] [summary] (1) As shown in FIGS. 1, 2, and 6, the energy storage device 11 includes a plurality of energy storage modules 15 capable of charging and discharging electric power, an energy storage device case 17 that houses the plurality of energy storage modules 15, and a protective plate 500 that is disposed on the outer side of the lower surface of the energy storage device case 17. As shown in FIG. 6, the protective plate 500 includes a connection portion (for example, a rib 501) that is connected to the energy storage device case 17. The connection portion has at least one of rigidity and strength higher than a portion of the protective plate 500 that is positioned around the connection portion.

[0057] As a result, the connection portion of protective plate 500, which has at least one of rigidity and strength higher than the portion of protective plate 500 positioned around the connection portion, is connected to power storage device case 17, which houses power storage module 15 therein. Therefore, compared to when the portion of protective plate 500 positioned around the connection portion is connected to power storage device case 17, it is possible to suppress the input of external force input to protective plate 500 to power storage device case 17, which houses power storage module 15 therein. As a result, it is possible to suppress the input of external force from protective plate 500 to power storage module 15.

[0058] (2) As shown in FIG. 6, the energy storage device case 17 may include a fixing portion (e.g., reinforcement 510) that is connected to the connection portion of the protective plate 500, and the energy storage module 15 may be fixed to a portion of the inner surface of the energy storage device case 17 that is located above the fixing portion.

[0059] As a result, the fixing portion of the power storage device case 17 is connected to the connection portion of the protective plate 500, which has at least one of rigidity and strength higher than the portion of the protective plate 500 positioned around the connection portion. Therefore, compared to when the power storage device case 17 is connected to the portion of the protective plate 500 positioned around the connection portion, it is possible to suppress the input of external force input to the protective plate 500 to the fixing portion of the power storage device case 17, inside which the power storage module 15 is housed. As a result, it is possible to suppress the input of external force from the protective plate 500 to the power storage module 15.

[0060] (3) As shown in FIG. 6, adhesive may be further provided at adhesive joints 330 that bond each of the plurality of energy storage modules 15 to the energy storage device case 17, and the adhesive may be provided on a portion of the inner surface of the energy storage device case 17 that is located above the fixing portion.

[0061] As a result, the power storage module 15 is adhered with adhesive to the portion located above the fixing portion. Therefore, compared to when the power storage module 15 is adhered to a portion of the power storage device case 17 that is different from the portion located above the fixing portion, the power storage module 15 can be more firmly fixed to a sturdy portion of the power storage device case 17.

[0062] (4) As shown in FIGS. 3 to 7 , each of the plurality of energy storage modules 15 includes a plurality of energy storage cells 100 including a first energy storage cell (for example, energy storage cell 100A) and a second energy storage cell (for example, energy storage cell 100B) arranged in one direction, coupling portions 170, 180, and 190, and a module case 300 that houses the plurality of energy storage cells 100 and the coupling portions 170, 180, and 190, and the first energy storage cell has a first end portion (for example, cover 150) adjacent to the second energy storage cell and a first terminal provided at the first end portion. (e.g., collector terminal 140), the second storage cell includes a second end (e.g., cover 150) adjacent to the first storage cell and a second terminal (e.g., collector terminal 140) provided at the second end, and connecting portions 170, 180, 190 are formed by connecting the first terminal and the second terminal, and the storage module 15 may be fixed to the storage device case 17 at portions of the outer surface of the module case 300 located outside the connecting portions 170, 180, 190.

[0063] This allows the energy storage module 15 to be fixed to the energy storage device case 17 at portions of the outer surface of the module case 300 of the energy storage module 15 that are located outside the connecting portions 170, 180, 190 to which the first terminal of the first energy storage cell and the second terminal of the second energy storage cell are connected. As a result, the connecting portions 170, 180, 190 can be effectively fixed to the energy storage device case 17.

[0064] (5) As shown in Figures 4, 6, and 7, the module case 300 includes a top plate and a bottom plate arranged in the vertical direction, and each of the storage modules 15 includes partition members 610, 620 that are provided within the module case 300 and are provided at the connecting portions 170, 180, 190, and the partition members 610, 620 may be arranged across the top plate and the bottom plate.

[0065] As a result, the partition members 610 and 620 can make the connecting portions 170, 180, and 190 of the power storage module 15 fixed to the power storage device case 17 strong.

[0066] (6) As shown in FIG. 6, the protective plate 500 may include a plate-shaped main body portion and a rib 501 formed to protrude upward from the main body portion, and the connecting portion may be the rib 501.

[0067] This makes it possible to make the connection portion of protection plate 500 that is connected to power storage device case 17 strong. In addition, protection plate 500 itself can be made strong.

[0068] 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]

[0069] 10 vehicle, 11 electricity storage device, 12 upper case, 13 lower case, 14 temperature adjustment device, 15 electricity storage module, 16 reinforcing member, 17 electricity storage device case, 100, 100A to 100C electricity storage cell, 110 electrode body, 112 coated portion, 114 electrode tab, 120 interposed member, 122 spacer portion, 124 support portion, 130 conductive film, 132 connection base portion, 134 connecting portion, 140 current collecting terminal, 142 connecting portion, 144 protruding portion, 150 cover, 160 laminate outer casing, 162 edge portion, 170, 180, 190 connecting portion, 300 module case, 310 case body, 320 lid, 330 adhesive joint portion, 400 external terminal, 500 protective plate, 501 rib, 510 Reinforcement, 610,620 Partition members.

Claims

1. a plurality of power storage modules capable of charging and discharging power; a housing case that houses the plurality of power storage modules; a protective plate disposed on the outer side of the lower surface of the storage case; the protective plate includes a connection portion connected to the housing case, The connection portion has at least one of rigidity and strength higher than a portion of the protective plate positioned around the connection portion.

2. the housing case includes a fixing portion connected to the connecting portion of the protection plate, The power storage device according to claim 1 , wherein the power storage module is fixed to a portion of the inner surface of the accommodating case that is located above the fixing portion.

3. further comprising an adhesive that bonds each of the plurality of power storage modules to the housing case; The power storage device according to claim 2 , wherein the adhesive is provided on a portion of the inner surface of the casing that is located above the fixing portion.

4. Each of the plurality of power storage modules is a plurality of storage cells including a first storage cell and a second storage cell arranged in one direction; A connecting portion; a module case that houses the plurality of storage cells and the connection portion, the first storage cell includes a first end portion adjacent to the second storage cell and a first terminal provided at the first end portion; the second storage cell includes a second end portion adjacent to the first storage cell and a second terminal provided at the second end portion; the coupling portion is formed by connecting the first terminal and the second terminal, The power storage device according to claim 2 , wherein the power storage module is fixed to the housing case at a portion of the outer surface of the module case that is positioned outside the connecting portion.

5. The module case includes a top plate and a bottom plate arranged in a vertical direction, each of the power storage modules includes a partition member that is provided in the module case and at the connecting portion; The power storage device according to claim 4 , wherein the partition member is disposed across the top plate and the bottom plate.

6. the protective plate includes a plate-shaped main body and a rib formed to protrude upward from the main body, The power storage device according to claim 1 , wherein the connecting portion is the rib.

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