JP2019067677A - Battery pack - Google Patents

Abstract

To provide a battery pack that is easily miniaturized.SOLUTION: A battery pack 10 includes an assembly 14, a cell case 11, a restraint plate 12 and an accessory module 13. The assembly 14 includes a plurality of stacked battery cells 17. The cell case 11 accommodates the assembly 14. The restraint plate 12 presses the assembly 14 along the stacking direction of the assembly 14. The accessory module 13 is provided on the opposite side of the pressing side of the assembly 14 of the restraint plates 12. The accessory module 13 has the complement of the assembly 14.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery assembly.

  There is known a power supply device in which a large number of cells are connected in series in order to output electric power for causing a vehicle such as an electric car and a hybrid car to travel using a motor for traveling the vehicle (see Patent Document 1).

JP, 2011-175743, A

  In the power supply device disclosed in Patent Document 1, a battery block (assembled battery) in which a circuit board and an electrical component are arranged is provided on both end faces of a battery stack in which a plurality of cells are connected. Because of the thickness in the stacking direction, each battery pack has been enlarged.

  The object of the present invention made in view of such circumstances is to provide a battery assembly which can be miniaturized.

In order to solve the above-mentioned subject, an assembled battery concerning the 1st viewpoint of the present invention is:
An assembly having a plurality of battery cells stacked;
A cell case accommodating the assembly;
A constraining plate for pressing the assembly inward of the cell case along a stacking direction of the assembly;
And an accessory module provided on the opposite side of the side of pressing the group of the restraint plate and having an accessory of the group.

  According to the present invention, it is possible to provide an assembled battery which can be easily miniaturized.

It is a perspective view showing the appearance of the group battery concerning one embodiment of the present invention. It is a disassembled perspective view for every component inside the assembled battery shown in FIG. It is a perspective view which shows the external appearance of the battery cell single body which comprises the aggregate | assembly of FIG. It is the side view which looked at the group of Drawing 2 from the cross direction. It is a perspective view which shows the external appearance of the cell case of FIG. It is the perspective view which looked at the side which engages with the 2nd case in the length direction in the 1st case of FIG. A back surface viewed from the side where the assembly and the insulating sheet accommodated in the lower bottom surface portion, the upper bottom surface portion, and the pair of side surface portions of the first case of FIG. 2 are engaged with the second case in the length direction FIG. It is the perspective view which looked at the side which engages with the 2nd case in the length direction in the 1st case of Drawing 2 from the opposite side. FIG. 9 is a cross-sectional view of the assembled battery taken along the line IX-IX in FIG. 6 with the battery cell inserted in the first case of FIG. 2; It is the rear view which looked at the side which engages with the 2nd case in the length direction in the 1st case of FIG. FIG. 13 is a partial cross-sectional view of the assembled battery in a cross section along line XI-XI of FIG. 9 in a state in which the assembly is accommodated in the first case of FIG. 2; It is an enlarged view of the dashed-dotted line enclosure part of FIG. It is the perspective view which looked at the side which engages with the 1st case in the length direction in the 2nd case of FIG. It is the perspective view which looked at the side which engages with the 1st case in the length direction in the 2nd case of Drawing 2 from the opposite side. It is the rear view which looked at the side which engages with the 1st case in the length direction in the 2nd case of FIG. It is a perspective view of the restraint board of FIG. It is the elements on larger scale which looked at the restraint board of FIG. 16 from the length direction. It is a perspective view of the auxiliary machine module of FIG. It is a schematic diagram which shows the 1st process of assembling the assembled battery of FIG. It is a schematic diagram which shows the 2nd process of assembling the assembled battery of FIG. It is a schematic diagram which shows the 3rd process of assembling the assembled battery of FIG. FIG. 22 is a partial cross-sectional view of the assembled battery in the middle of assembly in the cross section along the line XXI-XXI in FIG. 21 when the jig is inserted in the jig insertion hole. It is a schematic diagram which shows the method of laser welding when the jig | tool is inserted in the jig | tool insertion hole. It is a schematic diagram which shows the 4th process of assembling the assembled battery of FIG. It is a perspective view of the housing | casing which accommodated the assembled battery of FIG. FIG. 26 is a partial enlarged cross-sectional view of a housing accommodating the assembled battery in a cross section taken along line XXVI-XXVI in FIG. 25. It is a perspective view which shows the modification of the assembled battery of FIG.

  Hereinafter, embodiments of a battery assembly to which the present invention is applied will be described with reference to the drawings.

  As shown in FIG. 1, the battery assembly 10 is generally in the form of a substantially rectangular parallelepiped, and has rectangular outer surfaces perpendicular to each other in the length direction, width direction, and height direction orthogonal to each other. The battery assembly 10 is formed by fixing the accessory module 13 to the restraint plate 12 which holds the assembly together with the cell case 11 accommodating the assembly. As shown in FIG. 2, the assembled battery 10 includes an assembly 14, a cell case 11, an insulating sheet 15, a restraint plate 12, an accessory module 13, and a fixture 16.

  The assembly 14 is constituted by a plurality of battery cells 17. In the present embodiment, the assembly 14 includes, for example, six battery cells 17. As shown in FIG. 3, each battery cell 17 is configured of a main body portion 18, a flange portion 19, an electrode tab 20 p of a positive electrode, and an electrode tab 20 n of a negative electrode. In the following description, the positive electrode tab 20p and the negative electrode tab 20n are described as the electrode tab 20 when the positive electrode tab 20p and the negative electrode tab 20n are not particularly distinguished.

  The main body portion 18 is flat and rectangular. The main body portion 18 is formed by sandwiching the positive electrode, the negative electrode, the separator, the electrolyte, and the like from both surfaces of the flat surface with a laminate film larger than the flat surface. The laminated film is a laminated film in which resin layers are laminated on both sides of a metal layer.

  When sandwiching the main body portion 18, the ridge portion 19 adheres the laminated films extending outward from the side surface of the main body portion 18, and cuts them so as to have a predetermined size when viewed from the thickness direction of the flat surface. It is formed by The hook 19 extends in a rectangular hook shape in a direction parallel to the flat surface of the main body 18. In the ridge portion 19, in the vicinity of the position in the width direction in which the electrode tab 20 is formed, a part of the ridge portion 19 protrudes in the length direction to form the sub projection 21.

  The positive electrode tab 20p and the negative electrode tab 20n are formed from the center of the flat surface of the main body 18 at the end of the flat surface in the longitudinal direction. The electrode tab 20 projects from the longitudinal end of the collar 19. The positive electrode tab 20p and the negative electrode tab 20n may be formed at both ends in the longitudinal direction or at one end in the longitudinal direction.

  In the present embodiment, the positive electrode tab 20p and the negative electrode tab 20n are respectively formed at both ends in the longitudinal direction. Further, in the present embodiment, the electrode tab 20 is formed at the center in the width direction of the flat surface of the main body portion 18. The positive electrode tab 20p and the negative electrode tab 20n are connected to the positive electrode and the negative electrode in the main body 18, respectively.

  The electrode tab 20 is constituted by the extending portion 22 and the connecting portion 23. The extending portion 22 is in the form of a flat plate parallel to the flat surface of the main body portion 18. The connection portion 23 is formed by bending an end portion in the longitudinal direction of the extending portion 22 in the thickness direction. The connection portions 23 of the positive electrode tab 20p and the negative electrode tab 20n are respectively bent in different thickness directions.

  As shown in FIG. 4, the assembly 14 is formed by stacking a plurality of battery cells 17 with flat surfaces facing each other. Therefore, in the assembly 14, the thickness direction of each battery cell 17 is parallel to the stacking direction in the assembly 14. Moreover, in the assembly 14, the length direction and the width direction of each battery cell 17 are parallel to each other.

  In addition, in the assembly 14, the battery cells 17 adjacent to each other may be adhered and fixed by an adhesive or an adhesive such as a double-sided tape. For example, the battery cells 17 adjacent to each other may be bonded and fixed by an arbitrary method such as applying an adhesive to one flat surface of each battery cell 17. Similarly, the battery cell 17 and the insulating sheet 15 described later may be adhered and fixed by an adhesive. Similarly, the insulating sheet 15 and the restraint plate 12 described later may be adhered and fixed by an adhesive.

  The electrode tab 20p of the positive electrode and the electrode tab 20n of the negative electrode of one battery cell 17 of the adjacent battery cells 17 are the electrode tab 20n of the negative electrode and the positive electrode of the other battery cell 17, respectively, as viewed from the stacking direction. Opposite the tab 20p.

  Further, the connection portions 23 and 23 of the electrode tabs 20p and 20n facing each other in the stacking direction of the battery cells 17 adjacent to each other are bent in different stacking directions. For example, in FIG. 4, the connection portion 23 of the electrode tab 20 n on the left side of the lowermost battery cell 17 is bent upward in the drawing. Further, the connection portion 23 of the electrode tab 20p on the left side of the battery cell 17 in the second stage from the bottom facing the battery cell 17 is bent downward in the drawing. In FIG. 4, the stacking direction of the assembly 14 is parallel to the vertical direction of the paper surface, and the upward bending on the paper surface and the downward bending on the paper surface are bending in different directions in the stacking direction.

  With such a configuration, connection portions 23 and 23 of electrode tabs 20p and 20n of one battery cell 17 and the other battery cell 17 at one end in the lengthwise direction of battery cells 17 adjacent to each other from the lengthwise direction Seeing overlap. As described later, in the battery assembly 10, the overlapping electrode tabs 20, 20 are electrically connected as viewed in the lengthwise direction.

  As shown in FIG. 5, the cell case 11 has a rectangular parallelepiped shape as a whole. The cell case 11 may be made of any rigid material, for example, a metal material or resin material to which an electrically insulating material such as PET resin is applied on the surface. The cell case 11 has a lower bottom 24, an upper bottom 25, a pair of side portions 26, and a pair of abutments 27.

  The lower bottom surface portion 24 and the upper bottom surface portion 25 are substantially rectangular and overlap each other when viewed from the height direction. An opening ap for exposing the entire surface of the main body portion 18 of the assembly 14 is formed in the center of the upper bottom surface 25 in a state where the assembly 14 is accommodated in the cell case 11 when viewed from the height direction. .

  A pair of side surface portions 26 and a pair of abutment portions 27 are provided between the four opposing sides of the lower bottom surface portion 24 and the upper bottom surface portion 25. One set of side portions 26 face each other in the width direction. The distance between the inner surfaces of one set of side portions 26 is substantially equal to the length in the width direction of the battery cell 17. Further, one set of contact portions 27 are opposed to each other in the length direction. The distance between the inner surfaces of one set of contact portions 27 is approximately equal to the length of battery cell 17 in the longitudinal direction.

  One side face portion 26 has a cylindrical portion 28 penetrating in the height direction near both ends in the width direction and the length direction. A through hole th penetrating in the height direction is formed in the cylindrical portion 28.

  In the assembled battery 10, the inner surface (bottom surface) of the lower bottom surface portion 24 of the cell case 11 abuts on the flat surface of the main body portion 18 of the battery cell 17 at the end in the stacking direction. The cell case 11 accommodates the assembly 14 in an inner space defined by the lower bottom surface 24, the upper bottom surface 25, the pair of side surfaces 26, and the pair of abutments 27.

  In the present embodiment, as shown in FIG. 2, the cell case 11 is configured by a first case 11 a and a second case 11 b divided in the length direction. The cell case 11 is formed by engaging the first case 11 a and the second case 11 b along the length direction when the assembled battery 10 is manufactured.

  The first case 11a is configured by a first lower bottom surface portion 24a, a first upper bottom surface portion 25a, a pair of first side surface portions 26a, and a first contact portion 27a. The first lower bottom surface portion 24 a is formed by dividing the lower bottom surface portion 24 in the length direction. The first upper bottom surface 25a is formed by dividing the upper bottom surface 25 in the longitudinal direction. One set of first side surface portions 26 a is formed by dividing one set of side surface portions 26 in the longitudinal direction. The first contact portion 27a is the contact portion 27 on the first case 11a side in the length direction.

  Further, the second case 11b is configured by a second lower bottom surface portion 24b, a second upper bottom surface portion 25b, a pair of second side surface portions 26b, and a second contact portion 27b. The second lower bottom surface portion 24 b is formed by dividing the lower bottom surface portion 24 in the length direction. The second upper bottom surface 25b is formed by dividing the upper bottom surface 25 in the longitudinal direction. One set of second side surface portions 26 b is formed by dividing one set of side surface portions 26 in the longitudinal direction. The second contact portion 27 b is the contact portion 27 on the second case 11 b side in the length direction.

  As shown in FIG. 6, the first case 11a has a film insulating portion 29a extended so as to extend to both ends in the longitudinal direction of the first side surface 26a inside the first side surface 26a. . As shown in FIG. 7, in the state where the aggregate 14 is accommodated in the cell case 11, the film insulating portion 29 a is located between two ridges 19 of the battery cells 17 adjacent to each other.

  In the present embodiment, for example, the film insulating portion 29a is separated from the inner surface of the first lower bottom surface portion 24a by a distance in of the length direction of the main body portion 18 of the battery cell 17 in the height direction. It is provided at each position, which is the distance in from the position to the length in the thickness direction of the main body 18. In the present embodiment, a total of five film insulators 29a are provided.

  In the state in which the assembly 14 is accommodated in the cell case 11, the film insulating portion 29 a prevents contact between the two collar portions 19 of the battery cells 17 adjacent to each other, and mutually insulates each other. Further, the film insulating portion 29a also functions as a guide for guiding the battery cell 17 to the correct storage position when the battery cell 17 is inserted into the first case 11a in the political increase of the assembled battery 10.

  As shown in FIG. 8, the first contact portion 27 a includes a sub outer portion 30 a, a sub inner portion 31 a, and a pair of sub side surfaces 32 a. The sub outer portion 30 a and the sub inner portion 31 a are flat and perpendicular to the length direction. The sub side surface portion 32a has a flat plate shape perpendicular to the width direction. One set of sub side surface portions 32 a are provided separately from each other in the width direction of the sub outer side portion 30 a. The sub side surface portion 32a connects the sub outer side portion 30a and the sub inner side portion 31a. As shown in FIG. 9, in the first contact portion 27 a, at least one of the sub outer portion 30 a and the sub inner portion 31 a is in contact with the battery cell 17 in the assembled battery 10.

  The sub outer portion 30 a is provided on the outer side in the length direction than the sub inner portion 31 a when viewed in the height direction. The sub outer portion 30 a is provided in the assembled battery 10 at a position facing the electrode tab 20 of the battery cell 17 in the width direction. Therefore, in the present embodiment, the sub outer portion 30 a is formed at a position straddling the center of the cell case 11 in the width direction.

  As shown in FIG. 8, in the sub outer portion 30 a, a plurality of windows wd penetrating the sub outer portion 30 a in the length direction are formed at positions in the height direction in which the accommodation portion described later is formed. The window wd is substantially rectangular and extends along the width direction. The plurality of windows wd are formed such that both ends in the width direction of the plurality of windows wd are at the same position. The length in the height direction of the window wd is less than the length in the thickness direction of the battery cell 17. As shown in FIG. 10, the length in the height direction of the window wd may be longer in one part in the width direction than in the other parts.

  As shown in FIG. 9, the sub inner portion 31 a is provided in the assembled battery 10 at a position opposed in the width direction to the end surface in the longitudinal direction of the brim portion 19. In the inner surface is of the sub inner portion 30a, a stepped portion st recessed outward in the length direction is formed in the battery assembly 10 at a position opposed to the sub protrusion 21 in the width direction.

  In the state where the battery cell 17 and the first case 11a are inserted in such a manner that the battery cell 17 and the first case 11a are in contact with each other in the longitudinal direction, The interval sp2 between the connecting portion 23 and the end surface in the longitudinal direction which defines the jig insertion hole ih described later may be any interval which makes the length in the longitudinal direction of the jig or more. In the present embodiment, the distance sp1 in the length direction of the inner surface is of the sub inner portion 31a and the step portion st is equal to the length in the length direction of the sub protrusion 21 of the battery cell 17.

  Further, the space sp3 in the length direction to the inner surface of the sub outer portion 30a and the inner surface is of the sub inner portion 31a is inserted such that the first case 11a and the battery cell 17 abut each other in the length direction. In the state, it may be any length that makes the above-mentioned interval sp2 be equal to or longer than the length in the length direction of the jig. In the present embodiment, the distance sp3 in the length direction to the inner surface of the sub outer portion 30a and the inner surface is of the sub inner portion 31a is from the end in the length direction of the ridge portion 19 of the battery cell 17 excluding the sub protrusion 21. It is equal to the length to the longitudinal end of the electrode tab 20.

  As shown in FIG. 8, jig insertion holes ih are formed at positions in the height direction at which accommodating portions described later are formed in the pair of sub side surface portions 32 a facing each other.

  As shown in FIG. 10, a tab insulating portion 33a is provided in the space defined by the sub outer portion 30a, one set of sub side surface portions 32a, the first lower surface portion 24a, and the first upper surface portion 25a. It is done. The tab insulators 33a are extended between the inner surfaces of the pair of sub side surfaces 32a. As shown in FIG. 11, in the battery assembly 10, the tab insulating portion 33a is adjacent to the electrode tab 20 of one battery cell 17c1 whose connection portion 23 is connected to each other and the one battery cell 17c1 and The connection part 23 is located between the electrode tabs 20 of another set of battery cells 17c2 connected to each other.

  In the present embodiment, for example, the tab insulating portion 33a is separated from the inner surface of the first lower bottom surface portion 24a by the length in the thickness direction of the battery cell 17 at the distance in the height direction of the cell case 11 It is provided for each position which becomes the space | interval which doubled the length of the thickness direction of the battery cell 17 from the said position and the said position. In the present embodiment, as shown in FIG. 10, a total of three tab insulators 33a are provided.

  As shown in FIG. 11, in the battery assembly 10, the tab insulating portion 33a is adjacent to and connected to the electrode tab 20 of one battery cell 17c1 whose connecting portion 23 is connected to each other and the one battery cell 17c1. The parts 23 prevent contact with the electrode tabs 20 of another set of battery cells 17c2 connected to each other and insulate them from each other.

  As shown in FIG. 12, a plurality of guide portions 34a are provided on both sides in the height direction of the tab insulating portion 33a. The plurality of guide portions 34a are equally spaced in the width direction. In the present embodiment, four guide portions 34 a are provided for each surface in the height direction of each tab insulating portion 33 a. The guide portions 34a are provided at the same position in the width direction or at different positions on the facing surfaces of the tab insulating portions 33a adjacent to each other. In the present embodiment, the guide portions 34a are provided at the same position in the width direction on the facing surfaces of the tab insulating portions 33a adjacent to each other.

  The guide portion 34a is extended between both ends in the lengthwise direction of the tab insulating portion 33a. Regarding the length in the height direction of the guide portion 34a, the distance between the guide portions 34a provided on mutually facing surfaces of the tab insulating portions 33a adjacent to each other is the length in the thickness direction of the battery cell 17 and the thickness of the electrode tab 20 It is formed to be equal to or greater than the sum of the lengths in the longitudinal direction.

  In the guide portion 34a, a tapered portion 35 is formed in which the length in the height direction of the guide portion 34a is reduced as it goes inward in the length direction from the sub outer portion 30a. The tapered shape of the tapered portion 35 may be linear or curved.

  As shown in FIG. 10, the first housing portion hs1 is formed by the space defined by the sub outer portion 30a, the pair of sub side surface portions 32a, the tab insulating portion 33a, and the first lower bottom surface portion 24a. . Further, a second housing portion hs2 is formed by the space defined by the sub outer portion 30a, the pair of sub side surface portions 32a, and the tab insulating portion 33a adjacent to each other. Further, a third housing portion hs3 is formed by the space defined by the sub outer portion 30a, the pair of sub side surface portions 32a, the tab insulating portion 33a, and the first upper bottom surface portion 25a. In the following description, when the first accommodation portion hs1 to the third accommodation portion hs3 are not particularly distinguished, the first accommodation portion hs1 to the third accommodation portion hs3 are described as the accommodation portion hs. Each accommodation portion hs accommodates the electrode tab 20 of the battery cell 17 in the assembled battery 10.

  As shown in FIG. 13, the second case 11 b has a film insulating portion 29 b extended so as to extend to both ends in the longitudinal direction of the second side surface portion 26 b inside the second side surface portion 26 b. . The structure, mounting position, size, function, and the like of the film insulation portion 29b in the second case 11b are the same as those of the film insulation portion 29a in the first case 11a.

  As shown in FIG. 14, the second contact portion 27b of the second case 11b has a sub outer portion 30b, a sub inner portion 31b, and a pair of sub side surfaces 32b. In the second case 11b, the formation position in the height direction of the tab insulating portion is different from that of the first case 11a, as described later. Therefore, in the second case 11b, the formation position in the height direction of the housing portion is different from that of the first case 11a.

  The configuration other than the formation position of the window wd of the sub outer portion 30b of the second case 11b is the same as that of the sub outer portion 30a of the first case 11a. The configuration of the sub inner portion 31 b of the second case 11 b is the same as that of the sub inner portion 31 a of the first case 11 a. The configuration other than the formation position of the jig insertion hole ih of the sub side surface portion 32b of the second case 11b is the same as the sub side surface portion 32a of the first case 11a. In the second case 11b, the window wd and the jig insertion hole ih are formed at the height position of the housing portion hs, as in the first case 11a.

  In the present embodiment, as shown in FIG. 15, in the second case 11b, for example, the length in the thickness direction of the battery cell 17 is set to 2 from the inner surface of the second lower bottom surface portion 24b. It is provided for each position which becomes doubled length interval. In the present embodiment, a total of two tab insulators 33 b are provided.

  In the second case 11b, as in the first case 11a, a plurality of guide portions 34b are provided on both sides in the height direction of the tab insulating portion 33b. In the second case 11b, a plurality of guide portions 34b are provided in a region of the second lower bottom surface portion 24b facing the tab insulating portion 33b and a region of the second upper bottom surface portion 25b facing the tab insulating portion 33b. Is provided. The configuration, functions, and the like of the plurality of guide portions 34 b of the second case 11 b are the same as those of the first case 11 a.

  In the second case 11b, similarly to the first case 11a, the space defined by the sub outer side 30b, the pair of sub side surface portions 32b, the tab insulating portion 33b, and the second lower bottom surface portion 24b Four housing parts hs4 are formed. Further, a fifth housing portion hs5 is formed by the space defined by the sub outer portion 30b, the pair of sub side surface portions 32b, and the tab insulating portion 33b adjacent to each other. Further, a sixth housing portion hs6 is formed by the space defined by the sub outer portion 30b, the pair of sub side surface portions 32b, the tab insulating portion 33b, and the second upper bottom surface portion 25b. In the following description, when the fourth accommodation unit hs4 to the sixth accommodation unit hs6 are not particularly distinguished from the first accommodation unit hs1 to the third accommodation unit hs3, the first accommodation unit hs1 to the first accommodation unit hs1 The housing portion hs6 of 6 is described as the housing portion hs. Each accommodation portion hs accommodates the electrode tab 20 of the battery cell 17 in the assembled battery 10.

  In FIG. 2, the insulating sheet 15 is formed in a substantially flat plate shape from an electrically insulating material such as polypropylene (PP: PolyPropylene) or polyethylene (PE: PolyEthylene) resin. The insulating sheet 15 is disposed to abut on the flat surface of the main body 18 of the battery cell 17 opposite to the battery cell 17 in contact with the cell case 11 in the assembly 14. The insulating sheet 15 ensures electrical insulation between the restraint plate 12 in contact with the upper surface of the battery pack 10 and the battery cells 17 inside the battery pack 10.

  The restraint plate 12 is made of metal or metal on the surface of which an electrically insulating material such as PET resin is applied. As shown in FIG. 16, the restraint plate 12 is formed in a substantially flat plate shape. As shown in FIG. 2, in the battery assembly 10, the restraint plate 12 presses the assembly 14 inward of the cell case 11 along the stacking direction of the assembly 14. In other words, in the battery assembly 10, the restraint plate 12 presses the assembly 14 to the lower bottom surface 24 from the flat surface side opposite to the flat surface of the assembly 14 in contact with the lower bottom surface 24 of the cell case 11. Do.

  As shown in FIG. 16, in the present embodiment, the restraint plate 12 has a recess 36 in which a portion of the restraint plate 12 is recessed. As shown in FIG. 2, the recess 36 is fixed to the cell case 11 so as to be recessed toward the assembly 14 in the assembled battery 10. The restraint plate 12 abuts against the assembly 14 via the insulating sheet 15 and presses the assembly 14 on the surface of the recess 36 on the side projecting from the plate surface.

  The amount of depression of the recess 36 in the thickness direction of the restraint plate 12 is determined by the pressure in the thickness direction of the battery cell 17 in the initial state after manufacture and in the time-dependent state. Generally, there is a correlation between the battery characteristics of the battery cell 17 and the pressure in the thickness direction of the battery cell 17. That is, by applying a predetermined pressure, the electrode spacing in the battery cell 17 is stabilized, so the internal resistance is reduced and the battery characteristics of the battery cell 17 are improved. On the other hand, when the pressure is excessively applied, the chemical reaction itself in the battery cell 17 is inhibited, and the battery characteristics are degraded. Therefore, the amount of depression which can press the assembly 14 is set so that the internal resistance can be reduced in the initial state and the inhibition of the chemical reaction does not become excessive in the time-dependent state.

  The restraint plate 12 is provided with one or more recesses 36. In the battery assembly 10, the recess 36 is provided at a position overlapping the flat surface of the main body 18 exposed from the opening ap when viewed from the height direction. The position of the recess 36 on the surface of the constraining plate 12 may be any position, but it is preferable to be the center of the flat surface of the main body 18 of the battery cell 17 exposed from the opening ap. In addition, the size of the recess 36 in the plate surface of the restraint plate 12 may be arbitrary. In the present embodiment, at the position where the restraint plate 12 overlaps the opening ap of the cell case 11 in the battery assembly 10, the recess 36 having a shape and size overlapping the opening ap is provided.

  The surface of the recess 36 that protrudes from the plate surface of the restraint plate 12 may be parallel or inclined to the plate surface of the restraint plate 12. In the present embodiment, the surface of the recess 36 is parallel to the plate surface of the restraint plate 12. In the configuration in which the surface of the recess 36 is inclined with respect to the plate surface of the restraint plate 12, the surface of the recess 36 is directed from the restraint plate 12 in accordance with the center of the recess 36 viewed from the thickness direction. The slope may be linear or curvilinear so that the amount of depression is increased.

  As shown in FIG. 16, holes h are formed in each of the four corners of the outer edge portion 37 surrounding the recess 36 in the restraint plate 12. The hole h is formed in the assembled battery 10 at a position facing the through hole th of the cylindrical portion 28 of the cell case 11 when viewed from the height direction.

At the four corners of the outer edge portion 37, the restraint plate 12 is provided with fixing portions 38 inside the holes h in the width direction and the length direction. The fixing portion 38 is shaped to have a head and a shaft, such as a screw such as a bolt or a rivet. As shown in FIG. 17, the length L _fd of the head portion of the fixed portion 38 as viewed in the width direction or the length direction is equal to or less than the recess depth D _d of the recess 36.

  The fixing portion 38 is, for example, a bolt attached to a hole drilled in the restraint plate 12 in the present embodiment. The shaft portion of the fixing portion 38 is inserted into the hole formed in the restraint plate 12 from the assembly 14 side. Therefore, the head portion of the fixing portion 38 can fix the accessory module 13 to the restraint plate 12 as described later in a state where it is engaged from the aggregate 14 side in the region other than the concave portion 36 of the restraint plate 12.

  As shown in FIG. 18, the accessory module 13 includes an accessory base 39 and a plurality of accessories 40. As shown in FIG. 2, the accessory module 13 is provided on the opposite side of the surface of the assembled battery 10 that presses the aggregate 14 of the restraint plates 12.

  The accessory pedestal 39 is formed by delineating a frame along four sides of a rectangular on one side of a substantially rectangular flat plate. The accessory base 39 has fixing portions 41 at each of four corners of the plate surface. As shown in FIG. 2, the fixing portion 41 of the accessory pedestal 39 faces the fixing portion 38 of the restraint plate 12 when viewed from the height direction in the assembled battery 10. In the present embodiment, the fixing portion 41 of the accessory pedestal 39 is a hole through which the shaft portion of the bolt of the restraint plate 12 is inserted.

  By fixing the fixing portion 41 of the accessory pedestal 39 to the fixing portion 38 of the restraint plate 12, the accessory module 13 is fixed to the restraint plate 12. Therefore, the accessory module 13 is fixed to the restraint plate 12 in a region other than the recess 36 of the restraint plate 12.

  In FIG. 18, the accessory 40 is, for example, a relay, a circuit board, a fuse or the like used for input / output control of the power of the assembly 14. The accessory 40 is attached to the plate surface inside the frame of the accessory pedestal 39. Further, at least a part of the accessory 40 is disposed at a position overlapping the assembly 14 when viewed from the height direction in the assembled battery 10.

  In FIG. 2, the fixing tool 16 connects the fixing portion 38 of the restraint plate 12 and the fixing portion 41 of the accessory pedestal 475. In the present embodiment, the fixture 16 is a nut.

  Next, the assembly process of the battery assembly 10 will be described. As shown in FIG. 19, in the first step, each battery cell 17 is arranged along the length direction of the first case 11a in order from the side of the first lower bottom surface portion 24a of the first case 11a. It is inserted into the first case 11a. Each battery cell 17 is inserted until it abuts on the first contact portion 27a of the first case 11a in the length direction. After all the battery cells 17 are inserted into the first case 11a, the insulating sheet 15 is inserted between the battery cells 17 most inserted into the first upper bottom surface 25a and the first upper bottom surface 25a. Ru.

  The battery cell 17 is inserted into the first case 11a such that the length direction and the width direction of the battery cell 17 are parallel to the length direction and the width direction of the first case 11a. In the battery cells 17 of the odd-numbered stages from the side of the first lower bottom surface portion 24a in the height direction of the first case 11a, the connection portions 23 of the electrode tabs 20 are bent toward the first lower bottom surface portion 24a. , Inserted. In the battery cells 17 of even-numbered steps from the side of the first lower bottom surface portion 24a in the height direction of the first case 11a, the connection portion 23 of the electrode tab 20 is bent toward the first upper bottom surface portion 25a. , Inserted.

  As shown in FIG. 20, in the second step, the battery cell 17 and the insulating sheet 15 inserted in the first case 11a are on the opposite side to the side inserted in the first case 11a in the length direction, It is inserted into the second case 11b. Each battery cell 17 is inserted until it abuts on the second contact portion 27b of the second case 11b in the length direction. The second case 11b is aligned so that the first lower bottom surface portion 24a and the second lower bottom surface portion 24b coincide in the height direction upon insertion into the second case 11b.

  In the second step, after the insertion of the second case 11b, the total plus bus bar 42 is provisionally placed in one of the window wd closest to the first lower bottom portion 24a and the window wd closest to the first upper bottom portion 25a. It is fixed and total minus bus bar 43 is temporarily fixed to the other.

  As shown in FIG. 21, in the third step, the jig 50 is inserted into the jig insertion hole ih of the first case 11a. As shown in FIG. 22, when the jig 50 is inserted into the jig insertion hole ih, the connection portion of the battery cell 17 at the first stage from the first lower bottom surface portion 24a in the first housing portion hs1. 23 and the end of the total plus bus bar 42 are sandwiched between the sub outer portion 30 a and the jig 50 in a state where they overlap with each other as viewed in the length direction. In addition, when the jig 50 is inserted into the jig insertion hole ih, in the third housing portion hs3, the connection portion 23 of the battery cell 17 in the first stage from the first upper bottom surface portion 25a and the total minus The end portions of the bus bars 43 are sandwiched between the sub outer portion 30 a and the jig 50 in a state where they overlap with each other as viewed in the longitudinal direction. Further, when the jig 50 is inserted into the jig insertion hole ih, the connection portions 23 of the two adjacent battery cells 17 overlap each other in the second housing portion hs2 as viewed from the length direction. In this state, it is sandwiched between the sub outer portion 30 a and the jig 50.

  With the jig 50 inserted in the jig insertion hole ih, the connecting portion 23, the connecting portion 23 and the total plus bus bar 42, and the connecting portion 23 and the total minus bus bar 43 are respectively welded by an appropriate method such as laser welding. Be done. For example, when applying laser welding, as shown in FIG. 23, a laser for welding is irradiated to a welding spot through the window wd. After welding, the jig 50 is extracted from the jig insertion hole ih.

  In the second case 11b, as in the first case 11a, the jig 50 is inserted into the jig insertion hole ih, and the mutually overlapping connection portions 23 are welded by an appropriate method such as laser welding. . In the first case 11a and the second case 11b, as described above, the plurality of battery cells 17 constituting the assembly 14 are connected in series by welding the overlapping connection portions 23 respectively.

  As shown in FIG. 24, in the fourth step, the accessory module 13 is mounted on the restraint plate 12 by connecting the accessory module 13 and the restraint plate 12 via the fixing parts 41 and 38 of each other.

  The recess 36 of the restraint plate 12 on which the accessory module 13 is mounted is abutted against the insulating sheet 15 through the opening ap of the cell case 11. Further, a bolt is inserted through the hole h of the restraint plate 12 and the through hole th of the cell case 11 and fastened with a female screw such as a nut, whereby the restraint plate 12 is fixed to the cell case 11. Thus, the assembly of the battery assembly 10 is completed.

  Next, attachment of the assembled battery 10 to the housing will be described. As shown in FIG. 25, the battery assembly 10 is fixed inside the housing 44.

  The housing 44 is made of a highly rigid material. Examples of highly rigid materials used for the housing 44 include metal materials such as aluminum, and metal materials having a surface provided with an electrically insulating material such as PET resin or resin materials having high rigidity. The housing 44 has a box-like shape with one side open, and accommodates the battery assembly 10 inside.

  The fixing portion 45 is formed inside the housing 44. The fixing portion 45 is provided at a position facing the cylindrical portion 28 of the cell case 11 when viewed from the height direction in a state where the assembled battery 10 is fixed in the housing 44.

  As shown in FIG. 26, the fixing portion 45 has a length in the height direction which enables the bottom surface bs of the housing 44 to be in contact with the outer surface of the lower bottom portion 24 of the cell case 11. In the present embodiment, the fixing portion 45 is in contact with the cylindrical portion 28 of the cell case 11 in a state where the bottom surface bs of the housing 44 abuts on the outer surface of the lower bottom surface portion 24 of the cell case 11. Have a directional length. Further, the position in the height direction of the contact surface of the fixing portion 45 with the cylindrical portion 28 is near the center of gravity in the height direction of the battery assembly 10. More preferably, the position in the height direction of the contact surface of the fixing portion 45 with the cylindrical portion 28 coincides with the center of gravity in the height direction of the assembled battery 10.

  The fixing portion 45 is formed with a female screw at a position overlapping the through hole th of the cylindrical portion 28 when viewed in the height direction. The assembled battery 10 is fixed to the housing 44 by screwing the bolt 46 inserted into the through hole th of the cylindrical portion 28 into the female screw of the fixing portion 45. As described above, the through hole th of the cylindrical portion 28 is shared for fixing the restraint plate 12 to the cell case 11.

  In the battery assembly 10 according to the present embodiment as described above, the accessory module 13 is provided on the side opposite to the side pressing the assembly 14 of the restraint plate 12 for pressing the assembly 14 into the cell case 11. It is done. With such a configuration, the accessory 40 can be mounted at one place in the assembled battery 10, so the assembled battery 10 can be miniaturized as a whole.

  Further, in the battery assembly 10 according to the present embodiment, the recessed portion 36 recessed toward the aggregate 14 side of the restraint plate 12 is formed. With such a configuration, when the battery cell 17 is deformed so as to expand in a direction perpendicular to the flat surface due to gas pressurization generated inside the battery cell 17 due to deterioration with time, the deformation occurs in the recess 36 Only deformation can be absorbed, and deformation of the accessory pedestal 39 can be reduced. Therefore, even when battery cell 17 is deformed, the deformation of accessory pedestal 39 can be suppressed, and the influence on accessory 40 can be reduced.

Further, in the battery assembly 10 according to the present embodiment, the accessory module 13 is fixed to the restraint plate 12 in a region (the outer edge portion 37 in the present embodiment) other than the concave portion 36 of the restraint plate 12. With such a configuration, for example, when providing a mechanism for fixing the accessory module 13 to the restraint plate 12, for example, the fixing portion 38 in the present embodiment, the recess 36 as viewed from the width direction or the length direction A space for the recessed depth D _d can be used (see FIG. 17). Therefore, in the battery assembly 10, there is no need to expand the size of the restraint plate 12 as viewed in the thickness direction of the restraint plate 12 so as to be larger than the cell case 11, and enlargement can be prevented.

  Further, in the battery assembly 10 according to the present embodiment, at least a part of the accessory 40 is disposed at a position overlapping the assembly 14 as viewed in the stacking direction. With such a configuration, the center of gravity of relatively heavy assembly 14 and accessory 40 can be brought closer among the components of battery assembly 10. Therefore, the battery assembly 10 can bring the center of gravity of the assembly 14 and the accessory 40 closer to the center of gravity of the entire battery assembly 10. By bringing the center of gravity of the assembly 14 and the accessory 40 closer to the center of gravity of the entire assembled battery 10, the support stability of the assembled battery 10 is improved when the assembled battery 10 is transported by a robot or the like.

  Further, in the battery assembly 10 according to the present embodiment, the fixing portion 38 of the restraint plate 12 has a head having a length equal to or less than the recess depth of the recess 36 and the head is on the aggregate 14 side. Are engaged with the restraint plate 12. With such a configuration, the battery assembly 10 can effectively utilize a region other than the recess 36 which can be a dead space of the restraint plate 12 as a space for causing the fixing portion 38 to function. Therefore, enlargement of the assembled battery 10 can be prevented.

  Further, in the battery assembly 10 according to the present embodiment, since the restraint plate 12 is made of metal, mixing of noise that may be generated from the assembly 14 into the accessory 40 may be reduced. Further, in the assembled battery 10, since the restraint plate 12 is made of metal, the rigidity of the restraint plate 12 is relatively large, and the expansion of the battery cell 17 can be effectively reduced as described later.

  Further, in the battery assembly 10 according to the present embodiment, the connection portions 23 of the electrode tabs 20 to be welded to each other are accommodated in a single accommodation portion hs, and the windows wd are formed in the accommodation portions hs. With such a configuration, the battery assembly 10 can improve the positioning accuracy when welding the electrode tabs 20 of the battery cells 17 adjacent to each other.

  In the battery assembly 10 according to the present embodiment, the cell case 11 is provided with the film insulating portions 29a and 29b and the guide portions 34a and 34b. With such a configuration, in the battery assembly 10, the insertability of the battery cell 17 into the first case 11a and the second case 11b can be improved. Furthermore, in the battery assembly 10, since the tapered portions 35 are provided in the guide portions 34a and 34b, the insertability can be further improved. That is, in the battery assembly 10, the electrode tab 20 is prevented from deformation due to contact with the first contact portion 27a or the second contact portion 27b at the time of insertion, and the electrode tab 20 is reliably housed in the housing portion hs. obtain.

  Further, in the battery assembly 10 according to the present embodiment, the film insulating portions 29a and 29b are provided in the sub side surface portions 32a and 32b of the first case 11a and the second case 11b, respectively. With such a configuration, in the battery assembly 10, the electrical insulation between the adjacent battery cells 17 is not only in the initial state, but the battery cells 17 expand due to deterioration with time, and the height of the brim portion 19 in the battery assembly 10 It can be maintained even when the directional position changes.

  Further, in the battery assembly 10 according to the present embodiment, the cell case 11 is made of a metal material or a resin material to which an electrically insulating material is applied on the surface. With such a configuration, the battery assembly 10 can ensure electrical insulation between components such as electrical components disposed outside the battery assembly 10 and the battery cells 17 inside the battery assembly 10.

  Further, in the battery assembly 10 according to the present embodiment, the assembly 14 is fixed in the battery assembly 10 by pressing the restraint plate 12 from the direction perpendicular to the stacking direction. With such a configuration, the assembled battery 10 can reduce the expansion of the battery cells 17 in the stacking direction when the assembled battery 10 is used, when charging / discharging, or when an internal gas is generated after deterioration with time.

  Further, in the battery assembly 10 according to the present embodiment, the insulating sheet 15 and the restraint plate 12 are provided only in one of the stacking directions of the assembly 14. With such a configuration, the battery assembly 10 can improve productivity by simplifying the configuration based on a reduction in the number of parts, and can reduce manufacturing costs.

  Further, in the battery assembly 10 according to the present embodiment, the assembly 14 is fixed in the battery assembly 10 using a single restraint plate 12. The battery assembly 10 is fixed in the housing 44 with the lower bottom surface 24 side in contact with the housing 44 with a large rigidity. Side expansion may also be reduced. Therefore, installation of the restraint plate on the lower bottom surface 24 side is unnecessary, and the length in the height direction of the assembled battery 10 can be reduced.

  Further, in the battery assembly 10 according to the present embodiment, an opening ap is formed in the upper bottom surface portion 25 of the cell case 11. In the configuration in which the restraint plate 12 is in direct contact with the upper bottom surface 25 of the cell case without providing the opening ap, the cell case is deformed by the restraint plate 12 directly pressing the cell case, and deterioration is promoted. Ru. Therefore, with the above-described configuration of the present embodiment, the battery pack 10 can reduce the possibility of breakage of the cell case 11 due to deterioration with time by preventing pressurization of the cell case 11 by the restraint plate 12.

  Further, in the battery assembly 10 according to the present embodiment, the recess 36 is provided in the restraint plate 12 so as to overlap the center of the flat surface of the battery cell 17 when viewed in the height direction. With such a configuration, the internal gas of the battery cell 17 can escape to the outer periphery of the battery cell 17 separated from the vicinity of the positive electrode and the negative electrode of the main body 18. Therefore, in the battery pack 10, the internal gas that degrades the battery characteristics by being present between the positive electrode and the negative electrode in the battery cell 7 can be reduced, and as a result, the deterioration of the battery cell 7 can be reduced.

  Further, in the assembled battery 10 according to the present embodiment, the recessed amount of the recessed portion 36 of the restraint plate 12 is determined by the pressure in the thickness direction of the battery cell 17 in an initial state and a time-lapse state after manufacture. With such a configuration, in the battery assembly 10, the battery cells 17 can be appropriately pressurized from the initial state to the time-dependent state, and good battery characteristics can be maintained.

  Further, in the battery assembly 10 according to the present embodiment, the insulating sheet 15 is provided between the assembly 14 and the restraint plate 12. With such a configuration, battery assembly 10 can ensure electrical insulation between battery cell 17 and accessory 40.

  Further, in the battery assembly 10 according to the present embodiment, the position in the height direction of the contact surface of the fixed portion 45 with the cylindrical portion 28 in the housing 44 is near the center of gravity in the height direction of the battery assembly 10 . With such a configuration, since the battery assembly 10 is fixed in a well-balanced manner in the housing 44, it is possible to relieve the stress generated by vibration or impact during traveling of the battery assembly 10 mounted on the vehicle.

  Further, in the battery assembly 10 according to the present embodiment, the battery cells 17, the battery cells 17 and the insulating sheet 15, and the insulating sheet 15 and the restraint plate 12 are adhered and fixed. Such a configuration improves the resistance to vibration or impact in the battery assembly 10. Therefore, in the assembled battery 10, for example, in a state of being mounted on a vehicle, relative displacement of parts due to vibration or impact during traveling can be prevented. Thus, the battery pack 10 can prevent damage to the internal components due to vibration or impact by firmly fixing the internal components to one another.

  It will be apparent to those skilled in the art that the present invention can be realized in other predetermined forms other than the above-described embodiment without departing from the spirit or essential characteristics thereof. Thus, the foregoing description is illustrative and not restrictive. The scope of the invention is defined by the appended claims rather than by the foregoing description. Some of the changes that come within the scope of the equivalents are intended to be embraced therein.

  For example, in the present embodiment, the first case 11a and the second case 11b are connected to each other by fixing the restraint plate 12, but the present invention is not limited to such a structure. For example, as shown in FIG. 27, one of the first case 11a and the second case 11b has an engaging claw 47 projecting toward the other in the lengthwise direction, and an engaging hole 48 at the other corresponding position. It may be formed and the engaging claws 47 and the engaging holes 48 may be engaged. Alternatively, the engagement of the first case 11a and the second case 11b is not limited to the engagement between the claws and the holes. In the first case 11a and the second case 11b, any convex portions provided to project along the length direction from the respective first side surface portion 26a and second side surface portion 26b are formed by elastic members such as clips. It may be engaged by being pinched. Further, the first case 11a and the second case 11b may be connected by any fastening structure such as screwing.

  As described above, the battery assembly 10 may have any engagement structure as long as the first case 11a and the second case 11b can be reliably connected. With such a configuration, the assembled battery 10 can realize good assemblability, and as a result, contributes to improvement in product reliability.

  Further, in the present embodiment, each of the first case 11a and the second case 11b has the first contact portion 27a and the second contact portion 27b, but either one is the contact portion. 27 may be included. Further, in the present embodiment, in the contact portion 27, the set of end surfaces in the longitudinal direction of the ridge portion 19 other than the inner surface is of the sub inner portions 31 a and 31 b and the sub protrusion 21, the step st and the sub protrusion 21. Although the set of end surfaces in the longitudinal direction and the set of the inner surfaces of the sub outer portions 30a and 30b and the connecting portion 23 are in contact with each other, at least one set may be in contact.

  Further, in the present embodiment, although the tapered portion 35 is provided in the first case 11a and the second case 11b, the insertability of the battery cell 17 into the first case 11a and the second case 11b is secured. If possible, the tapered portion 35 may not be provided.

  Further, in the present embodiment, the guide portions 34 a and 34 b are provided in the first case 11 a and the second case 11 b respectively, but may not be provided. For example, the tab insulating portions 33a and 33b serve as the guide portions 34a and 34b by setting the distance between the tab insulating portions 33a and 33b facing each other in the height direction in the same manner as the distance between the guide portions 34a and 34b in the above embodiment. It can be shared.

  Further, in the present embodiment, the recessed portion 36 is provided in the constraining plate 12, but instead of the recessed portion 36, protrusions such as ribs and ridges may be formed which project from the flat surface of the constraining plate 12.

  Further, in the present embodiment, a female screw is formed in the fixing portion 45 of the housing 44, and the bolt 46 inserted into the hole h of the restraint plate 12 and the through hole th of the cylindrical portion 28 is screwed into the female screw of the fixing portion 45. By being inserted, the restraint plate 12 is fixed to the cell case 11, and the assembled battery 10 is fixed to the housing 44. However, the fixation of the restraint plate 12 to the cell case 11 and the fixation of the assembled battery 10 to the housing 44 are not limited to such a configuration. For example, an internal thread is formed in the cylindrical portion 28 instead of the through hole th, and a hole is formed in the fixing portion 45, and fixing of the restraint plate 12 to the cell case 11 using separate bolts and the assembled battery 10 Fixing to the housing 44 may be performed.

  Further, in the present embodiment, although the case 44 made of a material having high rigidity is pressed on the assembly 14 together with the constraining plate 12, the present invention is not limited to such a configuration. For example, the lower base portion 24 of the cell case 11 may be provided with sufficient rigidity to press the assembly 14 together with the restraint plate 12.

  Further, in the present embodiment, the opening ap is formed only in the upper bottom surface portion 25 of the cell case 11, and the restraint plate 12 pressing the aggregate 14 exposed from the opening ap is fixed to the upper bottom surface portion 25 side. Although the configuration is the same, the lower bottom surface 24 side of the cell case 11 may have the same configuration as the upper bottom surface 25. For example, an opening that exposes the entire surface of the main body 18 of the assembly 14 is formed at the center of the lower surface 24 with the assembly 14 accommodated in the cell case 11, and the lower surface 24 is also constrained. The assembly 14 may be pressed by fixing the plate.

DESCRIPTION OF SYMBOLS 10 assembled battery 11 cell case 11a 1st case 11b 2nd case 12 restraint board 13 auxiliary machine module 14 assembly 15 insulation sheet 16 fixture 17 battery cell 18 main-body part 19 edge part 20 electrode tab 20n negative electrode tab 20p The electrode tab 21 of the positive electrode 21 The sub-projecting portion 22 The extending portion 23 The connecting portion 24 The lower surface portion 24a The first lower surface portion 24b The second lower surface portion 25 The upper surface portion 25a The first upper surface portion 25b The second upper surface Part 26 side surface part 26a first side surface part 26b second side surface part 27 contact part 27a first contact part 27b second contact part 28 tube part 29a film insulating part of first case 29b second Case film insulation part 30a 1st case sub outer part 30b 2nd case sub outer part 31a 1st case sub inner part 31b 2nd case sub inner part 32a Sub-side surface portion of the first case 32b Sub-side surface portion of the second case 33a Tab insulating portion of the first case 33b Tab insulating portion of the second case 34a Guide portion of the first case 34b of the second case Guide portion 35 Taper portion 36 Recess portion 37 Outer edge portion 38 Fixing plate fixing portion 39 Auxiliary machine pedestal 40 Auxiliary machine 41 Auxiliary machine fixing portion 42 Total plus bus bar 43 Total negative bus bar 44 Case 45 Case fixing portion 46 Bolt 47 Engage Joint claw 48 engagement hole 50 jig ap opening bs bottom h hole hs accommodation part hs1 first accommodation part ih jig insertion hole is inner surface of sub inner part st step part th through hole wd window

Claims (6)

An assembly having a plurality of battery cells stacked;
A cell case accommodating the assembly;
A constraining plate for pressing the assembly inward of the cell case along a stacking direction of the assembly;
An accessory module provided on the side opposite to the side pressing the group of the restraint plate and having an accessory of the group; In the assembled battery according to claim 1,
The assembled battery has a recess recessed toward the assembly. In the assembled battery according to claim 2,
The assembled battery module is fixed to the restraint plate in a region other than the recess of the restraint plate. In the assembled battery according to claim 3,
It is a shape having a head having a length equal to or less than the recess depth of the recess, and the accessory module is fixed to the restraint plate in a state in which the head is engaged from the assembly side in a region other than the recess. A battery assembly further comprising a fixing portion for fixing. The assembled battery according to any one of claims 1 to 4.
At least a part of the accessory is disposed at a position overlapping with the assembly, as viewed in the stacking direction. The assembled battery according to any one of claims 1 to 5.
The restraint plate is made of metal.