JP2016096082A - Storage battery unit and power storage device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit deformation of a battery module which is caused by movement of the battery module in a housing.SOLUTION: A storage battery unit includes: a battery assembly 30; and a housing 50 having a first case and a second case which are disposed facing each other. The battery assembly 30 has a battery module 20 and a pair of side plates 31, 32, which sandwich the battery module 20, and is fixed to the second case. A folded portion 31c, which protrudes to the housing 50 in a direction intersecting with a direction that the first case faces and the second case, is formed at the plate 31.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a storage battery unit having at least one battery module housed in a housing, and a power storage device including the storage battery unit.

  In the past, power storage devices equipped with battery modules were often used in facilities that consume a large amount of electricity, such as factories, offices, and commercial facilities. However, in recent years, battery modules have become more compact due to higher energy density. The use in electric cars and ordinary houses is also increasing. By using such a power storage device, for example, it is possible to discharge electricity charged in the middle of the night at low electricity charges in the daytime, or to discharge electricity charged in the daytime by solar power generation in the nighttime. Etc., which helps to make effective use of energy.

  As an example of this type of power storage device, Patent Document 1 discloses a device having a plurality of battery modules in which a plurality of battery cells are arranged in parallel. In the power storage device disclosed in Patent Document 1, each battery cell is held by a battery holder. The battery holder further holds a cover member above the battery cell, and a controller that controls discharge of the battery cell and the like is installed on the cover member. The plurality of battery modules are united by being stacked one above the other, and the whole is housed in a case. In order to secure a space for the controller installed on the cover member when stacking a plurality of battery modules vertically, the battery holder has a protrusion at the top and a leg at the bottom. Yes. By fitting the protrusions of the lower battery holder and the legs of the upper battery holder, the plurality of battery modules are supported in a vertically stacked state.

JP 2014-154504 A

  Battery cells are electrical products that store electrical energy inside and repeat charge and discharge, and constituent materials such as electrolytes contain corrosive substances. Consideration for safety is also required at times. One of them is to prevent deformation of the battery module in the case due to vibration or impact during transportation. In a normal power storage device, a battery assembly in which a plurality of battery modules are unitized is often housed in a part fixed to a case. In that case, the battery assembly behaves in such a manner that it swings around the fixed portion of the case as a fulcrum when a vibration or impact during transportation acts on the battery assembly. If the shaking is too great, the battery assembly may collide with the inner surface of the case, and the battery module may be deformed in some cases. The deformation of the battery module can also cause leakage of the electrolytic solution and deterioration of battery performance.

  The battery module may collide with the case by fixing the battery assembly to the case from a plurality of directions, for example, at the four corners of the battery assembly. However, this complicates the structure for fixing the battery assembly to the case, and makes the power storage device assembly work complicated.

  An object of the present invention is to provide a storage battery unit and a power storage device in which deformation of a battery module due to movement of the battery module in the case is suppressed while the case and the battery assembly are fixed with a simple structure. .

A storage battery unit of the present invention includes a battery assembly including at least one battery module having a pair of opposed main surfaces, and a pair of plates sandwiching the battery module from a direction in which the main surfaces are opposed to each other,
A housing having two case members disposed to face each other so as to accommodate the battery assembly;
The battery assembly is fixed to one of the two case members such that a main surface of the battery module is parallel to a direction in which the two case members face each other, and at least one of the pair of plates includes: In the direction in which the two case members face each other, at least the end opposite to the case member to which the battery assembly is fixed protrudes toward the housing in a direction crossing the direction in which the two case members face each other Have

  In the above-described storage battery unit of the present invention, the protruding portion can be constituted by a bent portion formed by bending a plate. Moreover, when a battery assembly further has an electrical component attached to the surface of at least one plate of a pair of plate, it is preferable that the protrusion part protrudes rather than an electrical component.

  According to the present invention, the movement of the battery assembly in the housing due to vibration of the storage battery unit or the like can be reduced by providing the plate sandwiching the battery module with the protruding portion that protrudes toward the housing. As a result, deformation of the battery module is suppressed.

It is a disassembled perspective view of the storage battery unit by one Embodiment of this invention. It is a perspective view of the battery module shown in FIG. It is a perspective view which shows arrangement | positioning of a battery module, a side plate, and a middle plate of the battery assembly shown in FIG. It is sectional drawing along the thickness direction of a battery module of the storage battery unit shown in FIG. It is sectional drawing along the surface parallel to the main surface of a battery module of the storage battery unit shown in FIG. It is a figure which expands and shows the bending part vicinity of the side plate of sectional drawing shown in FIG. It is a perspective view which shows one form of the electrical storage apparatus using the storage battery unit by this invention.

  Referring to FIG. 1, there is shown a storage battery unit 10 according to an embodiment of the present invention that includes a battery assembly 30 having at least one battery module 20 and a housing 50 that hermetically accommodates the battery assembly 30. The housing 50 may be of any configuration as long as the battery assembly 30 can be accommodated in a sealed state. In this embodiment, the first case 51 and the first case 51 formed in a cup shape with a flange disposed so as to face each other. Two cases 56 are provided.

  The number of battery modules 30 included in the battery assembly 20 is not particularly limited, and may be arbitrary depending on the capacity and voltage required for the storage battery unit 10. As an example, in this embodiment, the battery assembly 30 includes eight battery modules 20 connected in series.

  For example, as shown in FIG. 2, the battery module 20 may have a housing case 21 in which one or a plurality of electrochemical cells (not shown) are housed. The outer shape of the storage case 21, in other words, the outer shape of the battery module 20 may be arbitrary, but considering the compactness of the battery assembly 30 when a plurality of battery modules 20 are stacked, the flat shape as shown in FIG. It is preferable that it is a rectangular parallelepiped shape. In this case, the outer surface of the battery module 20 includes two opposing main surfaces 22, a side surface 23 on the short side adjacent to the short side of the main surface 22, and a long side adjacent to the long side of the main surface 22. Side surface 24.

  The battery module 20 has positive and negative terminals 25a and 25b. These terminals 25 a and 25 b can be configured as a structure protruding from the outer surface of the battery module 20. Which surface of the battery module 20 the terminals 25a and 25b are disposed on may be arbitrary, and as an example, the terminals 25a and 25b are disposed on the side surface 23 on the short side in this embodiment. Further, for example, only one of the positive and negative terminals 25a and 25b can be disposed on the side surface 23 on the short side, and the other can be disposed on the side surface 24 on the long side.

  The material of the housing case 21 can be selected from various materials such as a resin material and a metal material. These resin materials and metal materials may constitute the housing case 21 alone, or may be combined to form the housing case 21. As an example of the combination of the resin material and the metal material, there is a double structure in which the inside is made of a resin material and the outside is made of a metal material. These resin material and metal material may be constituted by separate members, or may be integrally formed. When the storage case 21 has a double structure, the entire structure need not have a double structure. For example, at least the entire main surface 22 of the entire outer surface of the storage case 21 may be made of a metal material. Further, the storage case 21 does not have to have a structure in which the inside is sealed, and may have a structure in which a part of the main surface 22 and / or the side surfaces 23 and 24 has an opening.

  In the vicinity of the four corners of the housing case 21, for example, through holes 26 through which rod members 34 (see FIG. 4) pass in order to fix the plurality of battery modules 20 are formed penetrating in the thickness direction of the housing case 21. ing. The number and position of the through holes 26 are not particularly limited. However, in order to prevent relative rotation between the battery modules 20, the number of the through holes 26 is preferably plural, and in order to prevent the electrochemical cell from being damaged by the rod member, the through holes The position 26 is preferably the peripheral edge of the housing case 21.

  The electrochemical cell disposed in the housing case 21 may be a film-clad battery configured as a lithium ion secondary battery. A film-clad battery generally has a battery element in which a plurality of positive electrodes and a plurality of negative electrodes are alternately stacked via separators, and the battery element is enclosed in an exterior film such as a laminate film together with an electrolytic solution. It has a configuration. The voltage of one electrochemical cell may be in the range of 3.0V to 4.0V, for example. All of the plurality of electrochemical cells in the housing case 21 may be connected in series, or may be a combination of series connection and parallel connection. Although a specific arrangement is not limited, for example, 2 to 4 electrochemical cells may be stored in the storage case 21 in a state of being stacked in the thickness direction. In more detail, from the theoretical affinity with the charge protection device, a power of 2 (for example, 2 or 4) electrochemical cells may be built.

  In addition, since it is necessary to output single-phase three-wire AC200V similar to the alternating current power supplied from an electric power company to a general household in a household storage battery, the thing which connected the some electrochemical cell in series is incorporated. In particular, a laminate-type lithium ion battery (film-clad battery) is thin and lightweight, and is advantageous for multi-series use, and thus is used for a household power storage device. In order to output a single-phase three-wire AC200V, it is preferable to boost the voltage to about DC200V by connecting batteries in series in the apparatus in order to maximize the efficiency in the power conditioner (PCS). . Therefore, when a battery module having an average voltage of about 4 V is used, a configuration in which the number of electrochemical cells in the entire power storage device is 64 in series or a configuration in which two 32 series units are connected in series may be employed. This is because, when using 4 series battery modules, the power storage device has one storage battery unit in which 16 battery modules are connected in series, or 2 storage batteries in which 8 battery modules are connected in series. This corresponds to a configuration in which units are connected in series.

  Hereinafter, these main components will be described in detail.

(housing)
The housing 50 has a first case 51 and a second case 56. The first case 51 and the second case 56 may have any shape as long as they are configured to face each other and accommodate the battery assembly 30. Further, the first case 51 and the second case 56 may have slightly different details, but the overall shape can be the same. Hereinafter, the details of the shape will be described by taking the first case 51 as an example. The first case 51 can be formed by pressing a single plate material (for example, deep drawing press processing). As a whole, it has a shape like a bathtub, in other words, a seam having a predetermined depth. It has a shape with no cup.

  More specifically, the first case 51 has a cover surface corresponding to the bottom surface of the cup portion, four side surfaces extending from the peripheral edge portion of the cover surface, and a flange portion formed at the end of the side surface. . A connection portion between the cover surface and each side surface, and a connection portion between adjacent side surfaces are formed as a gently curved R portion. In order to satisfactorily form such a shape by press working, the curvature radius of the curved portion may be 25 mm or more (for example, the material thickness is 1.5 mm or more and 2.5 mm or less), and more specifically, It may be 30 mm or more.

  As the material of the first case 51 and the second case 56, for example, a rolled steel plate, a stainless steel plate or the like can be used. The thickness of the material of the first case 51 and the second case 56 may be in the range of 1.2 mm to 2.0 mm, for example, although it depends on the final module size and the like.

  The cover surface may be a flat surface that is not particularly processed, or may be processed into an uneven shape. Such a concavo-convex shape can be designed from various viewpoints, and may be formed with the intention of improving rigidity and heat dissipation, for example. The side surface may be formed substantially perpendicular to the cover surface, or may have a taper of about 1 ° to 3 °.

  The flange portion is formed in a planar shape so as to extend within one virtual reference plane (not shown), and the entire contour shape is rectangular. By attaching and fixing the flange portion of the first case 51 and the flange portion of the second case 56, one sealed space is formed between both cases. The flange portions can be fixed with fixing screws, welding, rivets or the like. If necessary, a plurality of insertion holes for passing a fixing screw or the like through the flange portion may be formed. The insertion hole may be formed by pressing, or may be formed by secondary processing using a drill or the like.

  When the inside of the housing 50 is a sealed space as in this embodiment, there is an operational effect that even if the internal battery cell is ignited for some reason, the housing 50 can be self-extinguished. . Thereby, ignition and fire spread of the battery unit 10 and by extension, the storage battery device using the same can be prevented. In order to ensure sufficient sealing performance, a groove is formed on the entire circumference of at least one flange portion of the first case 51 and the second case 56, and a reel ring, a gasket is formed in the space formed by the groove. It is preferable to arrange a sealing member such as. Alternatively, the sealing property may be secured by sandwiching the sealing member at a flange portion where no groove is formed. When the self-extinguishing property is not necessary, the housing 50 may not have a sealing property.

(Battery assembly)
The battery assembly 30 is an assembly having at least one battery module 20. In the form shown in FIG. 1, eight battery modules 20 are arranged (stacked) in the thickness direction. As shown in FIG. 3 with some battery modules 20 omitted, the battery assembly 30 is disposed at two side plates 31 and 32 disposed at both ends in the stacking direction of the plurality of stacked battery modules 20 and an intermediate portion. The middle plate 33 is further provided. However, these plates can be omitted in some cases.

  The side plates 31, 32 and the middle plate 33 have a role of pressing the battery module 20 from the thickness direction and a role of fixing the battery module 20 to the first stay 45 and the second stay 46, for example, pressing a sheet metal member It can be formed by processing. In order to play the latter role, the side plates 31 and 32 and the middle plate 33 have extension portions 31a, 32a, and 33a extending from two opposing sides. A fixing portion in which a hole for allowing a fixing screw to pass is formed on the distal end side of the extending portions 31a, 32a, 33a. In this portion, the side plates 31, 32 and the middle plate 33 are connected to the first stay. 45, fixed to the second stay 46. In FIG. 3, only one extending portion 32 a, 33 a is shown for one side plate 32 and middle plate 33.

  The sizes of the side plates 31 and 32 and the middle plate 33 may be, for example, the same size as each battery module 20 or may be slightly larger than that. In the side plates 31 and 32 and the middle plate 33, through holes 31b, 32b and 33b are formed at positions corresponding to the through holes 26 (see FIG. 2) of the battery module 20, respectively. A rod member is inserted through the through holes 31b, 32b, 33b of the plates 31 to 33 and the through hole 26 of the battery module 20, whereby the positions of the plurality of battery modules 20 are fixed. The rod member can be configured to include a bolt 34 and a nut 35. For example, as shown in FIG. 4, the bolt 34 includes one side plate 31, a plurality of battery modules 20, a middle plate 33, and the remaining plurality. The battery module 20 and the other side plate 32 can be passed through the through-holes in this order, and the nut 35 can be fastened at the tip to fix the battery module 20.

  The battery module 20 in the battery assembly 30 may be electrically connected in series or may be a combination of series connection and parallel connection. The electrical connection can be made using a bus bar and a cable. Further, the battery assembly 30 may have at least one temperature sensor that measures the temperature of the battery module 20.

  As shown in FIGS. 1 and 4, an electrical component 39 is attached to the surface of one side plate 31. The electrical component 39 includes a circuit board and an electrical component and / or an electronic component that constitute a circuit for controlling charging / discharging of each battery module 20 mounted on the circuit board. The electrical component 39 may be attached to the other side plate 32, or may be attached to both side plates 31, 32.

  As shown in FIG. 1, the battery assembly 30 can further include a power connection portion 37 for taking out power and a signal connection portion 38 for taking out a detection signal from a temperature sensor or the like. In order to make an electrical connection to these connection portions 37 and 38, for example, an opening may be formed in the second case 56, and a predetermined connector may be attached thereto. As this connector, it is preferable to use a connector having a waterproof function in consideration that the storage battery unit 10 is installed outdoors.

  The battery assembly 30 is fixed to either the first case 51 or the second case 56. In this embodiment, the battery assembly 30 is fixed to the second case 56 via the first stay 45 and the second stay 46. Hereinafter, the case where the battery assembly 30 is fixed to the second case 56 will be described as an example. However, the second case 56 in the following description is replaced with the first case 51, and the battery assembly 30 is fixed to the first case 51. It is also possible to have a structured.

  The first stay 45 and the second stay 46 can be constituted by, for example, a member obtained by bending a metal plate in a step shape. As a specific shape in the present embodiment, as shown in FIG. 5, the fixing surfaces 45 a and 46 a extending along the side surface of the second case 56 and the lower surfaces of the fixing surfaces 45 a and 46 a are bent, and a plurality of screw holes are formed. The formed attachment surfaces 45b, 46b, the connection surfaces 45c, 46c bent from the ends of the attachment surfaces 45b, 46b toward the cover surface of the second case 56, and the cover surfaces bent from the lower ends of the connection surfaces 45c, 46c And fixed surfaces 45d and 46d extending along the axis. Having these surfaces is common to the first stay 45 and the second stay 46, but their specific shapes and positions may be different from each other.

  The two fixing surfaces 45a, 45d, 46a, 46d of the first stay 45 and the second stay 46 are fixed to the inner surface of the second case 56, specifically, the side surface and the cover surface. Is done. The fixing method may be any method, but in order to ensure sealing performance, fixing by welding, which does not require the formation of a through hole or the like in the second case 56, is preferable.

  The battery assembly 30 can be fixed to the first stay 45 and the second stay 46 using the fixing portions provided on the side plates 31 and 32 and the middle plate 33 shown in FIG. The battery assembly 30 is fixed to the second case 56 by fixing these fixing portions and the mounting surfaces 45b, 46b of the first stay 45 and the second stay 46 by, for example, fixing screws.

  As shown in FIGS. 1 and 4, the side plates 31 and 32 have bent portions 31 c and 32 c at both ends in the direction in which the first case 51 and the second case 56 face each other. These bent portions 31 c and 32 c can be formed by bending the end portions of the side plates 31 and 32 to the outside of the battery assembly 30. The bent portions 31c and 32c constitute plate-like projecting portions that project toward the housing 50 in a direction intersecting the direction in which the first case 51 and the second case 56 face each other, for example, in a perpendicular direction.

  The dimensions and the like of the bent portions 31c and 32c in this embodiment will be described with reference to FIG. 6, taking the bent portion 31c of one side plate 31 located on the first case 51 side as an example.

  As shown in FIG. 6, the main surface of the outermost battery module 20 among the plurality of stacked battery modules 20 is used as a reference surface. At this time, the protrusion height H2, which is the height from the reference surface in the thickness direction of the battery module 20 to the tip of the bent portion 31c, is also higher than the height from the reference surface to the tip of the electrical component 39. In other words, the bent portion 31 c protrudes from the electrical component 39.

  In the storage battery unit 10 configured as described above, since the battery assembly 30 is fixed to the second case 56, an inertial force acts on the battery assembly 30 when an external force due to vibration or impact acts during transportation or the like. Depending on the magnitude of the force due to the inertia, the end of the battery assembly 30 on the side opposite to the fixed side is greatly shaken, and further collides with the inner surface of the housing 50. It can also occur. The deformation of the battery module 20 may affect the characteristics of the chemical battery cells constituting the battery module 20.

  In this embodiment, as described above, the bent portions 31c and 32c are formed on the side plates 31 and 32. Therefore, when the battery assembly 30 is shaken in the left-right direction of FIG. The tip of 32c contacts the inner surface of the first case 51, and the battery assembly 30 does not move any further. Thus, by making the battery assembly 30 small, deformation of the battery module 20 due to vibration or impact during transportation of the storage battery unit 10 can be suppressed. In addition, since it is not necessary to add a new fixing structure between the battery assembly 30 and the housing 50 in order to suppress the movement of the battery assembly 30 in the housing 50, a fixing structure similar to the conventional one can be adopted. The structure is not complicated.

  In addition, the bent portion 31 c is formed on the side where the electrical component 39 is provided and has a height that protrudes from the electrical component 39, so that the electrical component 39 and the housing 50 can be prevented from being shaken by the battery assembly 30. Collisions are prevented. As a result, the battery module 20 can be prevented from being deformed and the electrical component 39 can be protected.

  In order to minimize the amount of shaking of the battery assembly 30 when vibration or impact is applied to the storage battery unit 10, the clearance C between the bent portions 31 c and 32 c in the thickness direction of the battery module 20 and the inner surface of the housing 50 (see FIG. 6) is preferably as small as possible. However, if the clearance is too small, it is difficult to incorporate the battery assembly 30 into the housing 50. Considering these, the clearance C between the bent portions 31c and 32c in the thickness direction of the battery module 20 and the inner surface of the housing 50 is preferably in the range of 3 mm to 20 mm, more preferably 5 mm to 10 mm.

  The diameter of the through hole of the battery module 20 through which the rod member is inserted is smaller than the diameter of the rod member so that the rod member does not interfere with the battery module 20 even when the battery module 20 is shaken by vibration or impact. For example, it is preferably about 2 mm to 4 mm larger. Thereby, when the battery module 20 shakes, damage to the battery module 20 by a rod member can be prevented.

  In the example described above, the example in which the protruding portion is configured by the bent portions 31c and 32c of the side plates 31 and 32 has been described. However, the protruding portion is formed by a member different from the side plates 31 and 32 joined on the side plates 31 and 32. The protrusion can also be configured. In this case, any joining means such as welding or screwing can be employed as a joining means between the members constituting the protrusions and the side plates 31 and 32. Moreover, the member which comprises a 2nd protrusion part, and the side plates 31 and 32 may be the same material, and a different material may be sufficient as them.

  In the illustrated example, the example in which the protruding portions are provided at both the end portions on the first case 51 side and the end portions on the second case 56 side of the side plates 31 and 32 is shown. However, since the battery assembly 30 is fixed to the second case 56 at the end on the second case 56 side, the battery assembly 30 hardly moves. Therefore, a protrusion is provided only at the end on the first case 51 side. It may be provided. Further, the protrusions do not need to be provided on both side plates 31 and 32, and may be provided on at least one side, particularly on the side where the electrical component 39 is attached.

(Power storage device)
Next, an example of a power storage device using the above-described storage battery unit 10 will be described with reference to FIG.

  As shown in FIG. 7, the power storage device 1 includes a storage battery unit 10, a junction box 200, a power conditioner 300 (PCS: Power Conditioner System) 300, and a frame 80 that holds them. As an example, the power storage device 1 may be configured as a stationary power storage system used in a store or a home. In the illustrated example, the power storage device 1 includes two storage battery units 10, but the number thereof may be one or three or more.

  The junction box 200 is a part having devices such as various cable connection parts and wiring breakers, and these are housed in the storage box 201. Although detailed illustration is omitted, the junction box 200 is connected to a cable connected to the system power, a cable connected to the home (an example) power system, and the like.

  The power conditioner 300 is a part having a function of converting direct current and alternating current from each other and a function of controlling charging / discharging operations of the power storage device. Specifically, the power conditioner 300 converts an alternating current from a commercial power source into a direct current in order to charge the storage battery (during charging), and a direct current from the storage battery when using the stored power. Is stored in the storage case 301, and a device such as a battery management system (BMU: Battery Management System) which is a control circuit is also incorporated. The predetermined device in the power conditioner 300 and the predetermined device in the junction box 200 are electrically connected by a wiring (signal line, power line) (not shown).

  In addition, a conventionally well-known thing can also be utilized regarding these apparatuses. The battery management system has, for example, a function of managing the battery by controlling charge / discharge of each cell and monitoring voltage and temperature. Specifically, the total voltage and the remaining capacity of each cell may be calculated in real time and displayed on a predetermined display device as necessary. Further, a warning for overdischarge and overcharge may be performed.

  The frame 80 includes a frame main body portion 85 that holds the device, and leg portions 89L and 89R provided below the frame main body portion 85. The material of the frame 80 is not particularly limited, but is made of metal, for example. In the present embodiment, as an example, the junction box 200 and the power conditioner 300 are held in the upper stage of the frame main body 85, and the two storage battery units 10 are held in the lower stage. Since the storage battery unit 10 is a heavy object with a built-in battery as will be described later, disposing these in a low position is advantageous in that the center of gravity of the entire apparatus can be lowered. It is not limited to such an arrangement.

  The leg portions 89L and 89R may be provided as portions that are fixed with respect to a predetermined installation position. For example, a bolt through hole (not shown) for passing an anchor bolt (not shown) provided at the installation position of the power storage device may be formed in the legs 89L and 89R.

  Although illustration is omitted, the power storage device 1 may include an exterior cover that covers the entire device. The exterior cover may be attached to the frame 80 as an example.

  The present specification discloses the invention described below.

1. At least one battery module (20) having a pair of opposing main surfaces (22), and a pair of plates (31, 32) sandwiching the battery module (20) from the opposing direction of the main surface (22); A battery assembly (30) comprising:
A housing (50) with two case members (51, 56) disposed facing each other to accommodate the battery assembly (30);
The battery assembly (30) includes the two case members (51, 56) such that a main surface (22) of the battery module (20) is parallel to a direction in which the two case members (51, 56) face each other. ), And at least one of the pair of plates (31, 32) has at least the battery assembly (30) fixed in a direction in which the two case members (51, 56) face each other. A storage battery unit (10) having a protrusion (31c) protruding toward the housing (50) in a direction intersecting the direction in which the two case members (51, 56) face each other at the end opposite to the case member. .

  2. The storage battery unit (10) according to the above (1), wherein the protruding portion is formed of a bent portion (31c, 32c) formed by bending the plate (31, 32).

  3. The battery assembly (30) further includes an electrical component (39) attached to a surface of at least one plate (31) of the pair of plates (31, 32), and the protrusion (31c) 3. The storage battery unit (10) according to the above 1 or 2, which protrudes from the electrical component (39).

  4). The storage battery unit (10) according to any one of (1) to (3), wherein a clearance between the protrusion (31c, 32c) and the inner surface of the housing (50) in the thickness direction of the battery module (20) is 3 to 20 mm. ).

  5. The battery assembly (30) includes a plurality of the battery modules (20) stacked in the thickness direction of the battery module (20), and the pair of plates (31, 32) and the plurality of battery modules (20). The storage battery unit (10) according to any one of (1) to (4), further including a rod member (34, 35) for penetrating and fixing the) in the thickness direction.

6). The electrical storage apparatus (1) which has at least 1 storage battery unit (10) in any one of said 1-5.

DESCRIPTION OF SYMBOLS 1 Power storage device 10 Storage battery unit 20 Battery module 21 Storage case 22 Main surface 23, 24 Side surface 25a, 25b Terminal 26 Through-hole 30 Battery assembly 31, 32 Side plate 33 Middle plate 34 Bolt 35 Nut 37 Power connection part 38 Signal connection Part 39 Electrical component 45 First stay 46 Second stay 50 Housing 51 First case 56 Second case 80 Frame 200 Junction box 300 Power conditioner

Claims (6)

A battery assembly comprising: at least one battery module having a pair of opposing main surfaces; and a pair of plates sandwiching the battery module from the opposing direction of the main surfaces;
A housing having two case members disposed to face each other so as to accommodate the battery assembly;
The battery assembly is fixed to one of the two case members such that a main surface of the battery module is parallel to a direction in which the two case members face each other, and at least one of the pair of plates includes: In the direction in which the two case members face each other, at least the end opposite to the case member to which the battery assembly is fixed protrudes toward the housing in a direction crossing the direction in which the two case members face each other A storage battery unit.   The storage battery unit according to claim 1, wherein the protruding portion is formed by a bent portion formed by bending the plate.   3. The storage battery unit according to claim 1, wherein the battery assembly further includes an electrical component attached to a surface of at least one of the pair of plates, and the protruding portion protrudes from the electrical component. .   The storage battery unit according to any one of claims 1 to 3, wherein a clearance between the protruding portion and the inner surface of the housing in the thickness direction of the battery module is 3 to 20 mm.   The battery assembly includes a plurality of the battery modules stacked in the thickness direction of the battery module, and further includes a rod member that penetrates and fixes the pair of plates and the plurality of battery modules in the thickness direction. Item 5. The storage battery unit according to any one of Items 1 to 4.   The electrical storage apparatus which has at least 1 storage battery unit in any one of Claim 1 to 5.

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