Electricity storage device

Abstract

A power storage device is provided with: a plurality of power storage modules capable of charging and discharging; a power storage device case in which the plurality of power storage modules are housed; and a protective plate disposed on the outer side of the lower surface of the electricity storage device case. The protection plate includes a connection portion connected to the power storage device case. At least one of rigidity and strength of the connecting portion is higher than that of a portion of the protective plate located around the connecting portion. Therefore, compared with a condition that a part of the protection plate positioned around the connecting part is connected with the electricity storage device shell, the external force input to the protection plate can be prevented from being input to the electricity storage device shell in which the electricity storage module is accommodated. The input of external force from the protective plate to the power storage module can be suppressed.

Description

Technical Field

[0001] The present disclosure relates to a power storage device. Background Art

[0002] Conventionally, there are secondary battery storage modules that consist of a long, rectangular casing containing multiple battery cells with electrodes formed at both ends of the longitudinal direction. These cells are connected in series along the longitudinal direction, forming a long, rectangular secondary battery. For example, Japanese Patent Publication No. 2023-502698 discloses a battery pack in which these long, rectangular secondary battery storage modules are stacked in a stack along the lateral direction.

[0003] In such an elongated battery module, the casing is more susceptible to deformation due to external forces such as vibration than in a non-elongated case. Therefore, it is desirable to prevent external forces from being input into the battery module through the casing via the protective plate disposed outside the lower surface of the casing. Summary of the Invention

[0004] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a power storage device capable of suppressing input of external force from a protection plate to a power storage module.

[0005] The power storage device disclosed herein comprises: a plurality of chargeable and dischargeable power storage modules; a housing housing the plurality of power storage modules; and a protective plate disposed outside the lower surface of the housing. The protective plate includes a connection portion connected to the housing. The connection portion has at least one of higher rigidity and higher strength than a portion of the protective plate surrounding the connection portion.

[0006] With this structure, the connection portion of the protective plate, which has at least one of higher rigidity and strength than the portion of the protective plate surrounding the connection portion, is connected to the housing case housing the battery module. Therefore, compared to a case where the portion of the protective plate surrounding the connection portion is connected to the housing case, external forces applied to the protective plate are prevented from being transferred to the housing case housing the battery module. As a result, a battery device can be provided that suppresses external forces from being transferred from the protective plate to the battery module.

[0007] The housing case may include a fixing portion connected to the connecting portion of the protection plate, and each of the plurality of power storage modules may be fixed to a portion of the inner surface of the housing case located above the fixing portion.

[0008] With this structure, the fixed portion of the housing case is connected to the connection portion of the protective plate, which has at least one of higher rigidity and strength than the portion of the protective plate surrounding the connection portion. Therefore, compared to a case where the housing case is connected to the portion of the protective plate surrounding the connection portion, external forces applied to the protective plate are prevented from being transferred to the fixed portion of the housing case housing the battery module. Consequently, the transfer of external forces from the protective plate to the battery module is suppressed.

[0009] The structure may further include an adhesive for bonding each of the plurality of power storage modules to the storage case, wherein the adhesive is provided on a portion of the inner surface of the storage case located above the fixing portion.

[0010] With this structure, the battery module is bonded to the portion above the fixing portion with an adhesive. Therefore, compared to a case where the battery module is bonded to a portion of the housing case different from the portion above the fixing portion, the battery module can be more firmly fixed to a solid portion of the housing case.

[0011] It can also be constructed as each of multiple storage modules including: multiple storage cells, including a first storage cell and a second storage cell arranged in one direction; a connecting part; and a module shell, which accommodates the multiple storage cells and the connecting part, the first storage cell including: a first end portion, adjacent to the second storage cell; and a first terminal, arranged at the first end portion, the second storage cell including: a second end portion, adjacent to the first storage cell; and a second terminal, arranged at the second end portion, the connecting part is formed by connecting the first terminal and the second terminal, and each of the multiple storage modules is fixed to the accommodating shell at a portion of the outer surface of the module shell located outside the connecting part.

[0012] With this structure, the battery module is fixed to the housing case at a portion of the outer surface of the module case located outside the connection portion where the first terminal of the first battery cell and the second terminal of the second battery cell are connected. As a result, the connection portion can be effectively fixed to the housing case.

[0013] The module case may include a top plate and a bottom plate arranged in a vertical direction, and each power storage module may include a partition member provided in the module case and at the connection portion, with the partition member being arranged across the top plate and the bottom plate.

[0014] According to such a configuration, the connection portion of the power storage module fixed to the housing case can be strengthened by the partition member.

[0015] The protection plate may include a main body portion formed in a plate shape and a rib formed to protrude upward from the main body portion, wherein the connecting portion is the rib.

[0016] This strengthens the connection portion between the protection plate and the power storage device case, and also strengthens the protection plate itself.

[0017] 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 taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic side view showing a vehicle according to an embodiment of the present disclosure.

[0019] Figure 2 It is a perspective view showing a schematic configuration of a power storage device mounted on a vehicle according to the present embodiment.

[0020] Figure 3 This is a schematic perspective view showing a power storage module included in the power storage device according to this embodiment.

[0021] Figure 4 This is an exploded perspective view of the power storage module according to this embodiment.

[0022] Figure 5 This is an exploded perspective view of the storage cells included in the storage module of this embodiment.

[0023] Figure 6 It is a cross-sectional view of the power storage device according to the present embodiment, taken along the line AA.

[0024] Figure 7 It is a cross-sectional view of the power storage module according to this embodiment, taken along the line BB. DETAILED DESCRIPTION

[0025] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings referred to below, the same or corresponding parts are denoted by the same reference numerals.

[0026] Figure 1 It is a schematic side view showing a vehicle 10 according to an embodiment of the present disclosure. Figure 2 It is a perspective view showing a schematic configuration of a power storage device 11 mounted on a vehicle 10 according to the present embodiment.

[0027] Figure 3 It is a schematic perspective view showing the power storage module 15 included in the power storage device 11 according to the present embodiment.

[0028] Figure 4 This is an exploded perspective view of the power storage module 15 according to this embodiment. Figure 5 It is an exploded perspective view of the storage cell 100 included in the storage module 15 of this embodiment. Figure 6 It is a cross-sectional view taken along the line AA of the power storage device 11 according to the present embodiment. Figure 7 It is a cross-sectional view of the power storage module 15 according to the present embodiment, taken along the line BB.

[0029] Reference Figures 1 to 7 , the front, rear, up, down, right, and left directions are respectively the front, rear, up, down, right, and left directions of the vehicle 10. The axes of the front-rear, up-down, and left-right directions are orthogonal to each other.

[0030] The vehicle 10 is an electric vehicle. The electric vehicle may be a battery electric vehicle (BEV), a plug-in hybrid electric vehicle (PHEV), a hybrid electric vehicle (HEV), or a fuel cell electric vehicle (FCEV). Figure 1 As shown, vehicle 10 includes a power storage device 11. Power storage device 11 is a device capable of charging and discharging electric power for driving vehicle 10. Power storage device 11 is mounted on the bottom of the vehicle body 10 and forms part of the vehicle interior floor. However, this is not limiting; power storage device 11 may also be mounted under the vehicle interior floor.

[0031] like Figure 2 As shown, the power storage device 11 includes an upper case 12 , a lower case 13 , a temperature adjustment device 14 , a plurality of power storage modules 15 , and a reinforcement member 16 .

[0032] The upper housing 12 and the lower housing 13 are formed of a steel material (e.g., steel plate). The upper housing 12 and the lower housing 13 are joined at their respective flange portions (e.g., fastened at the flange portions by bolts and nuts), thereby forming an integral power storage device housing 17. A space is formed within the power storage device housing 17. The upper housing 12 is located above the lower housing 13. The power storage device housing 17 is mounted on the vehicle 10 such that its thickness direction coincides with the vertical direction of the vehicle 10. The long side direction and short side direction of the power storage device housing 17, which are perpendicular to the thickness direction, coincide with the front-back direction and the left-right direction of the vehicle 10, respectively. The long side direction and short side direction of the power storage device housing 17 are several times longer than the thickness direction.

[0033] like Figure 3As shown, the battery module 15 is a chargeable and dischargeable module with a roughly rectangular parallelepiped shape. The long side of the battery module 15 is several times longer than the longer of the remaining two sides, i.e., the short side. The short side is several times longer than the shorter of the remaining two sides, i.e., the thickness direction. The long, short, and thickness directions of the battery module 15 align with the left-right, up-down, and front-back directions of the vehicle 10, respectively.

[0034] like Figure 2 As shown, the storage modules 15 are stored within the interior of the storage device case 17. The storage modules 15 are stored so that their longitudinal, transverse, and thickness directions align with the transverse, thickness, and longitudinal directions of the storage device case 17, respectively. Multiple storage modules 15 are stored stacked in the thickness direction. The reinforcement member 16, which reinforces the lower case 13 and has a shape roughly identical to that of the storage modules 15, is mounted in the middle of the longitudinal direction of the lower case 13. Specifically, the reinforcement member 16 is positioned in the middle of the storage modules 15 in the direction in which the modules 15 are stacked.

[0035] The temperature adjustment device 14 is a device that heats or cools the storage module 15 to adjust the temperature of the storage module 15. Figure 2 As shown, the temperature adjustment device 14 is formed into a generally flat plate shape. The long and short sides of the temperature adjustment device 14 are shorter than the long and short sides of the inner surfaces of the upper shell 12 and the lower shell 13, respectively, and are aligned with these directions. The temperature adjustment device 14 is mounted to the plurality of storage modules 15, for example, using an adhesive, in such a manner that the surface defined by its long and short sides contacts the surface defined by its thickness and long sides of the plurality of storage modules 15. Furthermore, the temperature adjustment device 14 can be mounted to the plurality of storage modules 15 using other methods, not limited to adhesives. The temperature adjustment device 14 is stored together with the plurality of storage modules 15 in the internal space of the storage device housing 17.

[0036] like Figure 3 and Figure 4 As shown, the battery module 15 includes a plurality of battery cells 100 ( Figure 4 In the middle are storage cells 100A and 100B. Figure 6The module 15 includes a battery cell 100A to 100C in the middle), a module case 300, and an external terminal 400. The module case 300 is composed of a case body 310 and a cover 320. The material of the case body 310 and the cover 320 is, for example, aluminum. The case body 310 is in the shape of a roughly rectangular parallelepiped with a hollow longitudinal direction. The cover 320 is in the shape of a rectangular flat plate that closes the opening of the case body 310. The outer shape of the case body 310 and the cover 320 constitutes a part of the outer shape of the above-mentioned battery module 15. The cover 320 is joined to the case body 310 by welding in a manner that blocks the opening of the case body 310. The joining method is not limited to this, and other methods, such as adhesives, may also be used.

[0037] The storage cell 100 is composed of a lithium-ion battery. However, the present invention is not limited thereto and the storage cell 100 may also be composed of other types of secondary batteries such as an all-solid-state battery. Figure 4 As shown, the outer shape of the storage cell 100 is roughly a rectangular parallelepiped. A plurality of storage cells 100 are arranged in a row in such a manner that the long side direction of the storage cell 100 is consistent with the long side direction of the module casing 300, and are housed inside the module casing 300. The storage cell 100 has collector terminals 140 at both ends in the long side direction. The collector terminal 140 provided at one end in the long side direction of the storage cell 100 is a positive terminal, and the collector terminal 140 provided at the other end is a negative terminal. Adjacent storage cells 100 are electrically connected to each other through their mutual collector terminals 140 (one is a positive terminal and the other is a negative terminal), thereby forming a connecting portion 190 of the storage cell 100.

[0038] like Figure 3 and Figure 4 As shown, external terminals 400 are provided on the lid 320 at both ends of the battery module 15 in the longitudinal direction. One of the external terminals 400 is a positive terminal, and the other is a negative terminal. The positive external terminal 400 is electrically connected to the positive collector terminal 140 of the battery cell 100 closest to the positive external terminal 400, thereby forming a connecting portion 180. The negative external terminal 400 is electrically connected to the negative collector terminal 140 of the battery cell 100 closest to the negative external terminal 400, thereby forming a connecting portion 170.

[0039] like Figure 4 、 Figure 5 as well as Figure 7 As shown, the storage cell 100 includes at least one electrode body 110, an intervening member 120, a conductive film 130, a current collecting terminal 140, a cover 150, and a laminated outer body 160. Figure 4 Storage cells 100A and Figure 7 In the figure, a laminated outer body 160 is shown, but in Figure 4 Storage cell 100B and Figure 5 In the figure, the laminated outer casing 160 is omitted.

[0040] In this embodiment, the storage cell 100 is provided with two electrode bodies 110. However, the number of electrode bodies 110 provided in the storage cell 100 is not limited to two. The electrode body 110 is composed of a wound body in which a positive electrode sheet and a negative electrode sheet are wound with a separator interposed therebetween. However, the electrode body 110 may also be composed of a stacked body in which a positive electrode sheet and a negative electrode sheet are stacked with a separator interposed therebetween. The two electrode bodies 110 are arranged in a stacking direction ( Figure 5 The electrode body 110 is formed to be adjacent to each other in the front-to-back direction. Figure 5 A shape that is longer in the left-right direction.

[0041] Electrode body 110 includes a coated portion 112 and an electrode sheet 114. Coated portion 112 is the region of the electrode foil of the positive or negative electrode sheet where the active material layer is provided. Electrode sheet 114 is the region of the electrode foil of the positive or negative electrode sheet where the active material layer is not provided, that is, the uncoated portion where the electrode foil is exposed.

[0042] The interposing member 120 is disposed between a pair of adjacent electrode sheets 114. The interposing member 120 is made of an insulating material (eg, synthetic resin). Figure 3 and Figure 5 As shown, the interposing member 120 has a spacer portion 122 and a support portion 124 .

[0043] The separator portion 122 is adjacent to the boundary of the pair of adjacent coating portions 112 in the orthogonal direction, and is adjacent to the pair of adjacent electrode sheets 114 in the stacking direction. The separator portion 122 has a shape in which its dimension in the stacking direction gradually increases as it moves away from the boundary of the pair of coating portions 112 in the orthogonal direction. The separator portion 122 is formed in a generally triangular prism shape.

[0044] The support portion 124 supports each electrode pad 114. The support portion 124 protrudes outward in the orthogonal direction from the separator portion 122. The support portion 124 is formed of the same material as the separator portion 122 and is formed integrally with the separator portion 122. The support portion 124 is formed in a substantially quadrangular prism shape.

[0045] The conductive film 130 is made of metal (eg, copper or aluminum) and is provided on the surface of the interposition member 120 . The conductive film 130 is connected to each electrode pad 114 . The conductive film 130 includes a pair of connection bases 132 and a connecting portion 134 .

[0046] Each connection base 132 is a portion connected to the electrode sheet 114. Each connection base 132 is provided between the support portion 124 and the electrode sheet 114. Each connection base 132 covers the outer surface of the support portion 124 in the stacking direction.

[0047] The connecting portion 134 connects the pair of connecting 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 connecting base 132.

[0048] The collector terminal 140 is connected to the conductive film 130. The collector terminal 140, electrically connected to the positive electrode tab 114 via the conductive film 130, is made of, for example, aluminum. The collector terminal 140, electrically connected to the negative electrode tab 114 via the conductive film 130, is made of, for example, copper. The collector terminal 140 includes a connecting portion 142 and a protruding portion 144.

[0049] The connection portion 142 is connected to the coupling portion 134 by welding, but may be connected by other methods such as brazing. 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.

[0050] The protrusion 144 protrudes outward in the orthogonal direction from the connection portion 142. The protrusion 144 is formed in a flat plate shape. The thickness of the protrusion 144 may also be greater than the thickness of the conductive film 130. Figure 4 As shown, the protrusion 144 of the collector terminal 140 in the storage cell 100A is connected to the protrusion 144 of the collector terminal 140 in the adjacent storage cell 100B.

[0051] The cover 150 covers the end portions of the electrode body 110 in the longitudinal direction, and more specifically, covers the electrode sheet 114. The cover 150 is made of an insulating material (eg, synthetic resin). Figure 4 、 Figure 5 as well as Figure 7 As shown, the cover 150 is provided with a through hole h through which the protrusion 144 is inserted.

[0052] The laminated outer package 160 houses the two electrode bodies 110, the intervening member 120, the conductive film 130, a portion of the collector terminal 140, and the cover 150. The laminated outer package 160 is made of a laminated film. Figure 7 As shown, the laminated outer casing 160 has an edge 162 . The edge 162 is formed by connecting (welding) laminate films. The protrusion 144 protrudes outward in the longitudinal direction of the storage cell 100 from the edge 162 of the laminated outer casing 160 .

[0053] In the case of the elongated battery module 15 as described above, the deformation of the module case 300 due to external forces such as vibration is greater than that of the case of the non-elongated module. Therefore, it is desirable to suppress the external force from the outer side of the lower surface of the battery case 17. Figure 6The protection plate 500 shown (also referred to as a “shared panel”) is input to the power storage module 15 via the power storage device case 17 .

[0054] Therefore, the protective plate 500 includes a rib 501 connected to the power storage device case 17. The rib 501 is designed to have at least one of higher rigidity and higher strength than the portion of the protective plate 500 surrounding the rib 501. The high-rigidity portion is a portion that is less likely to deform when a force is applied. The high-strength portion is a portion that is less likely to break when a force is applied.

[0055] Thus, the ribs 501 of the protection plate 500, which have at least one of higher rigidity and strength than the portion of the protection plate 500 surrounding the ribs 501, are connected to the power storage device case 17, which houses the power storage module 15. Therefore, compared to a case where the portion of the protection plate 500 surrounding the ribs 501 is connected to the power storage device case 17, external forces applied to the protection plate 500 are suppressed from being transferred to the power storage device case 17, which houses the power storage module 15. Consequently, the transfer of external forces from the protection plate 500 to the power storage module 15 is suppressed.

[0056] like Figure 4 、 Figure 6 as well as Figure 7 As shown, partition members 610 and 620 are provided at the connection parts 170, 180, and 190 of the storage cell 100 in a manner that clamps the connection parts of the collector terminals 140 on both sides or the connection parts between the collector terminals 140 and the external terminals 400. The partition members 610 and 620 are in the shape of a quadrangular prism that is hollow in the longitudinal direction, that is, in the vertical direction. The material of the partition members 610 and 620 can be synthetic resin or metal. The shell body 310 of the module shell 300 is composed of a top plate and a bottom plate that are orthogonal to each other in the vertical direction, and two side plates that are orthogonal to each other in the front-back direction. The length of the partition members 610 and 620 in the longitudinal direction is the same as the width of the inner surface of the top plate and the bottom plate of the shell body 310. Therefore, the partition members 610 and 620 function as reinforcement members (so-called pillars) between the top plate and the bottom plate of the connection parts 170, 180, and 190 of the shell body 310.

[0057] The outer surface of the case body 310 of the module case 300 below the connecting portions 170, 180, and 190 is bonded to the inner surface of the lower case 13 of the power storage device case 17 by adhesive at the adhesive bonding portion 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 by the adhesive.

[0058] The power storage device 11 further includes a reinforcement beam 510 (also referred to as a "reinforcement member"). The reinforcement beam 510 is provided below the connecting portions 170, 180, and 190. The reinforcement beam 510 is formed from a steel material (e.g., a steel plate). The reinforcement beam 510 is joined to the lower case 13 of the power storage device case 17 by welding. The reinforcement beam 510 is provided across the longitudinal width of the lower case 13.

[0059] 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 (e.g., a steel plate). Ribs 501 are provided in the portion below the connecting portions 170, 180, and 190 of the protective plate 500, extending over the width of the lower case 13 in the longitudinal direction. The rib 501 portion of the protective plate 500 is configured to have higher rigidity and strength than the portion located around the rib 501. The rib 501 serves as a connection portion with the reinforcing beam 510. The rib 501 and the reinforcing beam 510 are fastened at the connection portion by bolts and nuts. However, this is not limiting, and the rib 501 and the reinforcing beam 510 may also be joined by other methods, such as welding or bonding.

[0060] [Modification]

[0061] (1) In the above embodiment, if Figure 6 As shown, the module case 300 of the storage module 15 includes three storage cells 100. However, the number of storage cells 100 included in the module case 300 is not limited thereto, and may be two or more.

[0062] (2) In the above embodiment, if Figure 6 As shown, the power storage device case 17 includes a reinforcing beam 510 as a fixing portion connected to the connecting portion of the protective plate 500. However, the present invention is not limited to this, 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 without the reinforcing beam 510.

[0063] (3) In the above embodiment, if Figure 6 As shown, the connection portion of the protective plate 500 to the power storage device case 17 is formed by a rib 501. However, the present invention is not limited to this, and such a connection portion can be configured to have at least one of higher rigidity and higher strength than the portion of the protective plate 500 surrounding the connection portion. It may also have a structure different from the rib 501, for example, a structure in which a reinforcement member is welded to the protective plate 500.

[0064] [Summarize]

[0065] (1) Figure 1 、 Figure 2 as well as Figure 6As shown, the power storage device 11 includes: a plurality of power storage modules 15 capable of charge and discharge; a power storage device case 17 that accommodates the plurality of power storage modules 15; and a protection plate 500 that is disposed outside the lower surface of the power storage device case 17. Figure 6 As shown, the protection plate 500 includes a connection portion (eg, rib 501) connected to the power storage device case 17. The connection portion has at least one of higher rigidity and higher strength than a portion of the protection plate 500 surrounding the connection portion.

[0066] As a result, the connection portion of the protection plate 500, which has at least one of higher rigidity and strength than the portion of the protection plate 500 surrounding the connection portion, is connected to the power storage device case 17, which houses the power storage module 15. Therefore, compared to a case where the portion of the protection plate 500 surrounding the connection portion is connected to the power storage device case 17, external forces applied to the protection plate 500 are suppressed from being transferred to the power storage device case 17, which houses the power storage module 15. Consequently, the transfer of external forces from the protection plate 500 to the power storage module 15 is suppressed.

[0067] (2) Figure 6 As shown, the battery case 17 may include a fixing portion (eg, a reinforcing beam 510 ) connected to the connecting portion of the protection plate 500 , and each battery module 15 may be fixed to a portion of the inner surface of the battery case 17 located above the fixing portion.

[0068] As a result, the fixed portion of the power storage device case 17 is connected to the connection portion of the protection plate 500, which has at least one of higher rigidity and strength than the portion of the protection plate 500 surrounding the connection portion. Therefore, compared to a case where the power storage device case 17 is connected to the portion of the protection plate 500 surrounding the connection portion, external forces applied to the protection plate 500 can be suppressed from being transferred to the fixed portion of the power storage device case 17, which houses the power storage module 15. Consequently, the transfer of external forces from the protection plate 500 to the power storage module 15 can be suppressed.

[0069] (3) Figure 6 As shown, the structure may further include an adhesive bonding portion 330 , wherein the adhesive of the adhesive bonding portion 330 bonds each of the plurality of power storage modules 15 to the power storage device case 17 , and the adhesive is provided on a portion of the inner surface of the power storage device case 17 located above the fixing portion.

[0070] Thus, the battery module 15 is bonded to the portion above the fixing portion by the adhesive. Therefore, compared to a case where the battery module 15 is bonded to a portion of the battery case 17 different from the portion above the fixing portion, the battery module 15 can be securely fixed to a solid portion of the battery case 17.

[0071] (4) Figures 3 to 7 As shown, each of the plurality of storage modules 15 may include: a plurality of storage cells 100, including a first storage cell (e.g., storage cell 100A) and a second storage cell (e.g., storage cell 100B) arranged in one direction; connecting portions 170, 180, 190; and a module case 300, which accommodates the plurality of storage cells 100 and the connecting portions 170, 180, 190, wherein the first storage cell includes: a first end portion (e.g., cover 150) adjacent to the second storage cell; and The first terminal (for example, the collector terminal 140) is arranged at the first end, and the second storage cell includes: a second end (for example, a cover 150) adjacent to the first storage cell; a second terminal (for example, the collector terminal 140) is arranged at the second end, and the connecting parts 170, 180, and 190 are formed by connecting the first terminal and the second terminal. Each part of the storage module 15 located outside the connecting parts 170, 180, and 190 in the outer surface of the module shell 300 is fixed to the storage device shell 17.

[0072] As a result, the storage module 15 is fixed to the storage device case 17 at the portion of the outer surface of the module case 300 of the storage module 15 located outside the connecting portions 170, 180, and 190 to which the first terminal of the first storage cell and the second terminal of the second storage cell are connected. As a result, the connecting portions 170, 180, and 190 can be effectively fixed to the storage device case 17.

[0073] (5) Figure 4 、 Figure 6 as well as Figure 7 As shown, the module housing 300 may also be constructed to include a top plate and a bottom plate arranged in the vertical direction, and each of the battery modules 15 may include partition components 610, 620, which are arranged in the module housing 300 and in the connecting parts 170, 180, and 190, and the partition components 610, 620 are arranged throughout the top plate and the bottom plate.

[0074] Thus, the connection portions 170 , 180 , and 190 of the power storage modules 15 fixed to the power storage device case 17 can be strengthened by the partition members 610 and 620 .

[0075] (6) Figure 6 As shown, the protection plate 500 may include a main body portion formed in a plate shape and ribs 501 formed to protrude upward from the main body portion, and the connecting portion is the ribs 501 .

[0076] This makes it possible to strengthen the connection portion between the protection plate 500 and the power storage device case 17. In addition, the protection plate 500 itself can be strengthened.

[0077] While the embodiments of the present invention have been described, the embodiments disclosed this time should be considered in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the claims, and all modifications within the meaning and scope of the claims are intended to be included.

Claims

1. A power storage device, wherein: have: Multiple storage modules capable of charging and discharging; a receiving shell, accommodating the plurality of power storage modules therein; as well as A protective plate is arranged on the outer side of the lower surface of the housing, The protection plate includes a connection portion connected to the receiving shell, The connection portion has at least one of higher rigidity and higher strength than a portion of the protection plate located around the connection portion.

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

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

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

5. The power storage device according to claim 4, wherein The module housing includes a top plate and a bottom plate arranged in an up-down direction. Each of the plurality of power storage modules includes a partition member, the partition member being provided in the module case and provided at the connecting portion. The partition member is arranged across the top plate and the bottom plate.

6. The power storage device according to any one of claims 1 to 5, wherein The protection plate includes: a main body formed in a plate shape; and ribs formed to protrude upward from the main body. The connecting portion is the rib.

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