JP2021015664A - Power storage module laminated structure - Google Patents

Abstract

To provide a power storage module laminated structure that can adjust the spacing between stacked storage modules.SOLUTION: A battery module laminated structure 1 includes a fixing member 30 provided between a first battery module 10 and a second battery module 10, and the fixing member 30 includes a base portion 31 interposed between the first battery module 10 and the second battery modules 10, and claws (regulation portions) 32 and 33 that restrict the movement in a direction orthogonal to the stacking direction of the first battery module 10 and the second battery module 10.SELECTED DRAWING: Figure 7

Description

The present invention relates to a power storage module laminated structure.

In recent years, secondary batteries such as lithium ion secondary batteries have been used as a power source for vehicles such as electric vehicles and hybrid electric vehicles, or electric devices.
A battery module in which a plurality of secondary battery cells are housed in a case may be mounted on a vehicle or the like as a battery module laminated structure in which a plurality of batteries are laminated.
As a structure for stacking a plurality of battery modules, battery modules having through holes formed in the stacking direction are laminated, a through bolt is inserted through each through hole, and a screw portion provided at the tip of the through bolt is attached. The structure to be fastened to the part is known. As an example of such a structure, a structure is known in which a conductive collar having a hollow tubular shape is inserted into a through hole of each battery module, and a through bolt is inserted into the hollow portion of the conductive collar. The conductive collar buckles and expands with the central portion in the axial direction as a boundary, and has a centering effect when tightened with a through bolt. The conductive collar has almost the same height as the battery module, and one is inserted into one battery module, and the battery module contacts the top surface of the lower battery module and the bottom surface of the upper battery module. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-313733

In the battery module laminated structure, for convenience of layout, the wire harness for connecting the battery modules to the power supply and the control unit is routed between the battery modules through the gap between the stacked battery modules and between the battery modules. It may not pass through the gap. Further, it is necessary to adjust the cooling capacity by changing the interval between the stacked battery modules depending on the heat dissipation capacity of the battery modules.
In the battery module laminated structure described in Patent Document 1, the interval between the stacked battery modules cannot be adjusted.

According to one aspect of the present invention, the power storage module laminated structure is laminated so as to face each other, and the first power storage module and the second power storage module in which the power storage cells are housed, respectively, and the first power storage A fixing member provided between the module and the second power storage module is provided, and the fixing member includes a base portion interposed between the first power storage module and the second power storage module, and the fixing member. It has a first power storage module and a regulation unit that regulates the movement of the second power storage module in a direction orthogonal to the stacking direction.

According to the present invention, the distance between the stacked power storage modules can be adjusted by using the fixing members having different base thicknesses.

The external perspective view which shows the 1st Embodiment of the battery module laminated structure as the power storage module laminated structure of this invention. An exploded perspective view of the battery module laminated structure shown in FIG. The external perspective view of the battery module shown in FIG. The perspective view which removed the insulating cover of the battery module shown in FIG. An exploded perspective view of the battery module shown in FIG. FIG. 6 is a sectional view taken along line VI-VI of the battery module laminated structure shown in FIG. The figure before assembling the battery module laminated structure shown in FIG. The external perspective view of the fixing member illustrated in FIG. The exploded perspective view which shows the 2nd Embodiment of the battery module laminated structure of this invention. FIG. 9 is a perspective view showing a state in which a part of the fixing member shown in FIG. 9 is cut off. The external perspective view which shows the 3rd Embodiment of the battery module laminated structure of this invention. An exploded perspective view of the battery module laminated structure shown in FIG. The external perspective view of the fixing member shown in FIG. FIG. 11 is a sectional view taken along line XIV-XIV of the battery module laminated structure shown in FIG. The figure before assembling the battery module laminated structure shown in FIG. FIG. 13 is a cross-sectional view of a modified example 1 of a fixing member as a third embodiment shown in FIG. FIG. 13 is a cross-sectional view of a modified example 2 of a fixing member as a third embodiment shown in FIG. The exploded perspective view which shows the 4th Embodiment of the battery module laminated structure of this invention.

− First Embodiment −
Hereinafter, the first embodiment of the power storage module laminated structure of the present invention will be described with reference to FIGS. 1 to 8.
In the following, a battery module laminated structure having a secondary battery cell such as lithium ion as the power storage module laminated structure will be described as an example.
FIG. 1 is an external perspective view of the battery module laminated structure 1, and FIG. 2 is an exploded perspective view of the battery module laminated structure 1 shown in FIG.
The battery module laminated structure 1 has a plurality of battery modules 10, a fixing member 30, a fastening member 81, and a lower case 60. The plurality of battery modules 10 are laminated with the fixing member 30 in between, and are fixed by the fastening member 81 in the stacking direction and in the direction orthogonal to the stacking direction.
In the following, the battery module laminated structure 1 is illustrated as a structure in which two battery modules 10 are laminated, but the number of the battery modules 10 to be laminated is not limited to two, and any three or more batteries are arbitrary. Can be a number.

Each battery module 10 has a holding case 100 having a substantially rectangular parallelepiped shape, and each of the four corners of the holding case 100 is formed with a substantially cylindrical boss portion 110 extending in the height direction. .. As shown in FIG. 2, a through hole 111 is formed in the center of the boss portion 110. Four fixing members 30 are arranged between the battery modules 10 arranged one above the other. Each fixing member 30 has a through hole 34 in the central portion, and each of the fixing members 30 is arranged so that the through hole 34 is coaxial with the through hole 111 of the boss portion 110. Although the details will be described later, the fixing member 30 has a structure of fitting to the boss portion 110. The fastening member 81 is a bolt having a head portion 82 and a male screw portion 83 formed on the tip end side. The lower case 60 is arranged on the lower side of the lower battery module 10. A nut 61 is welded to the lower surface of the lower case 60, that is, the surface opposite to the side facing the battery module 10.

The through hole 111 of each battery module 10 and the through hole 34 of the fixing member 30 are arranged coaxially between the upper and lower battery modules 10, and the fastening member 81 is arranged between the through hole 111 of each battery module 10 and the fixing member 30. It is inserted through the through hole 34 of the above. Then, the male threaded portion 83 of the fastening member 81 is fastened to the female threaded portion of the nut 61 of the lower case 60. As a result, the two battery modules 10 stacked vertically are restricted from moving in the vertical direction and moving in the direction orthogonal to the vertical direction, and are fixed in the stacked state.

FIG. 3 is an external perspective view of the battery module shown in FIG. 1, FIG. 4 is a perspective view of the battery module shown in FIG. 3 with the insulating cover removed, and FIG. 5 is an exploded view of the battery module shown in FIG. It is a perspective view.
The battery module 10 includes a plurality of cylindrical secondary battery cells 21 (see FIG. 5), a plurality of bus bars 22, a holding case 100 accommodating a plurality of secondary battery cells 21, and a pair of left and right voltage detection units 23. , 24 and an insulating cover 25 (see FIG. 3). The voltage detection units 23 and 24 are covered with an insulating cover 25.
The secondary battery cell 21 is a cylindrical secondary battery cell, and has a positive electrode 21a at one end in the axial direction and a negative electrode 21b at the other end. The plurality of secondary battery cells 21 are arranged in two upper and lower stages at a predetermined pitch with the axial directions parallel to each other. The plurality of secondary battery cells 21 on the upper stage side are all arranged with the positive electrode 21a facing the front side (front side). The plurality of secondary battery cells 21 on the lower stage side are all arranged with the negative electrode 21b facing the front side. That is, in the upper and lower secondary battery cells 21, the positive electrode 21a and the negative electrode 21b are arranged so as to face opposite sides in the axial direction. The secondary battery cell 21 on the upper stage side and the secondary battery cell 21 on the lower stage side are arranged with a deviation of half a pitch in the arrangement direction.

The holding case 100 is composed of three members: a lower holding case 101, a middle holding case 102, and an upper holding case 103. The lower holding case 101 and the middle holding case 102 sandwich and hold the plurality of secondary battery cells 21 on the lower stage side, and the middle holding case 102 and the upper holding case 103 sandwich and hold the plurality of secondary battery cells 21 on the upper stage side. To do.
The lower holding case 101, the middle holding case 102, and the upper holding case 103 are formed of, for example, a resin having an insulating property such as PBT (polybutylene terephthalate).

As shown in FIG. 5, the positive electrode 21a of the secondary battery cell 21 on the upper stage side and the negative electrode 21b of the secondary battery cell 21 on the lower stage side adjacent thereto are connected by a bus bar 22. That is, each bus bar 22 connects the positive electrode 21a and the negative electrode 21b of a pair of secondary battery cells 21 arranged diagonally adjacent to each other. The positive electrode 21a1 of the leftmost secondary battery cell 21 on the upper stage side is connected to the positive electrode terminal plate 26a, and the negative electrode 21b1 of the rightmost secondary battery cell 21 on the lower stage side is connected to the negative electrode terminal plate 26b. As a result, all the secondary battery cells 21 between the positive electrode terminal plate 26a and the negative electrode terminal plate 26b housed in the holding case 100 of the battery module 10 are electrically connected in series. The positive electrode 21a or the negative electrode 21b of the bus bar 22 and the secondary battery cell 21, the positive electrode terminal plate 26a and the positive electrode 21a1, and the negative electrode terminal plate 26b and the negative electrode 21b1 are joined by, for example, welding or a laser beam.

The voltage detection unit 23 is arranged in front of the plurality of bus bars 22 on the front side (in front of the holding case 100 in FIG. 5) to connect the secondary battery cells 21 in the upper and lower stages, and the voltage detection unit 23 is arranged in the upper and lower stages. A voltage detection unit 24 is arranged behind a plurality of bus bars 22 on the rear side to which the secondary battery cell 21 is connected.

The voltage detection units 23 and 24 have a voltage detection circuit that detects the voltage of the cylindrical secondary battery cell 21. The voltage detection units 23 and 24 have a similar structure, and each has a circuit board 121, a fuse 122, a connector 123, and a connection conductor 124, respectively.
The circuit board 121 has a constant width and has a strip shape extending along the longitudinal direction of the holding case 100. A wiring pattern (not shown) is formed on the opposite side of the bus bar 22 in the circuit board 121, and the terminals of the connector 123 and the fuse 122 are soldered to the connection pad portion of the wiring pattern formed on the circuit board 121. Connected by. A connecting member for connecting to the voltage detection circuit is connected to the connector 123. The fuse 122 has a function of breaking the circuit when each secondary battery cell 21 is short-circuited. That is, the fuse 122 is blown at the time of a short circuit to prevent a large current from flowing to the control unit, and prevents smoke and ignition from the connector 123 or the voltage detection line.

The bus bar 22 has a pair of battery joints 22a joined to the secondary battery cell 21 and an intermediate portion 22b connecting the battery joints 22a. A fixing hole 22c is formed in the intermediate portion 22b. The connecting conductor 124 is provided with a connecting hole 124a. A screw 51 is inserted into the connection hole 124a of the connection conductor 124 and the fixing hole 22c of the bus bar 22, and the screw 51 is fastened to a female screw portion formed at substantially the center of the boss portion 52 of the holding case 100. That is, the connecting conductor 124 and the bus bar 22 are co-tightened by the screw 51 and electrically conducted. A nut (not shown) is welded to the back surface side of the positive electrode terminal plate 26a, and the circuit board 121 is provided with a fixing ring 125 connected to the connecting conductor 124. The screw 51a is inserted into the through hole of the positive electrode terminal plate 26a and fastened to the nut of the fixing ring 125. As a result, the positive electrode terminal plate 26a is fixed to the circuit board 121 and electrically connected to the connecting conductor 124. Further, the negative electrode terminal plate 26b is fastened together with the connecting conductor 124 by the screw 51b and fixed to the holding case 100.

The circuit board 121 is fixed to the boss portion 53 of the holding case 100 by the screw 54. As a result, the voltage detection units 23 and 24 are fixed to the holding case 100.
As described above, the voltage detection units 23 and 24 are covered with the insulating cover 25 fixed to the holding case 100, and the insulating protection of the conductor portion such as the connecting conductor 124 is achieved.

FIG. 6 is a VI-VI line sectional view of the battery module laminated structure shown in FIG. 1, and FIG. 7 is a view before assembling the battery module laminated structure shown in FIG.
As shown in FIG. 6, at the four corners of the lower holding case 101, a substantially cylindrical boss portion 110a having a through hole 111a formed in the axial center is formed. At the four corners of the middle holding case 102, a substantially cylindrical boss portion 110b having a through hole 111b formed in the axial center is formed. At the four corners of the upper holding case 103, a substantially cylindrical boss portion 110c having a through hole 111c formed in the axial center is formed. The boss portions 110a, 110b, 110c and the through holes 111a, 111b, 111c have projections projected onto a plane in a direction orthogonal to the stacking direction of the battery modules 10 at the same position and the same size. Therefore, when the lower holding case 101, the middle holding case 102, and the upper holding case 103 are laminated, as shown in FIG. 6, the boss portion 110 in which the boss portions 110a, 110b, and 110c are continuously laminated in the vertical direction is formed. It is formed. Further, the through holes 111a, 111b, and 111c are continuously formed in the vertical direction to form the through holes 111.

FIG. 8 is an external perspective view of the fixing member 30 illustrated in FIG.
The fixing member 30 has a base portion 31, a pair of claw portions 32 projecting to one surface side of the base portion 31, and a pair of claw portions 33 projecting to the other surface side of the base portion 31. The fixing member 30 is formed by press working, and the base portion 31, the claw portions 32, and 33 have a uniform thickness (length in the axial direction). The claw portions 32 and 33 all have the same width (length in the circumferential direction). A through hole 34 is formed in the central portion of the base portion 31. The pair of claw portions 32 are bent substantially perpendicular to the base portion 31, and are provided on the outer periphery of the base portion 31 so as to face each other, in other words, at intervals of 180 ° in the circumferential direction. That is, the pair of claw portions 32 are arranged line-symmetrically with respect to a straight line that passes through the center of the through hole 34 and is orthogonal to the straight line connecting the centers of the pair of claw portions 32. The pair of claw portions 33 are bent substantially perpendicular to the base portion 31 on the side opposite to the protruding direction of the claw portion 32, and face the outer periphery of the base portion 31 in a facing manner, in other words, a circumference. It is provided every 180 ° in the direction. That is, the pair of claw portions 33 pass through the center of the through hole 34 and are arranged line-symmetrically with respect to a straight line orthogonal to the straight line connecting the centers of the pair of claw portions 33. The claw portion 32 and the claw portion 33 are alternately arranged at equal intervals along the outer circumference of the base portion 31 so as to be located in the middle of the other party in the circumferential direction. In other words, the claw portion 32 and the claw portion 33 are alternately arranged at 90 ° intervals in the circumferential direction. Therefore, the pair of claw portions 32 and the pair of claw portions 33 are arranged at positions where the projections projected on the plane parallel to the base portion 31 do not overlap. The distance between the facing surfaces of the pair of claws 32 and the distance between the facing surfaces of the pair of claws 33 are formed so that the outer shape of the boss portion 110 can be fitted.

A method of assembling the upper and lower battery modules 10 to create the battery module laminated structure 1 will be described. The method of assembling the battery module 10 is the same at any corner of the holding case 100 of the battery module 10, and the method of assembling the battery module 10 at one corner of the holding case 100 is described with reference to FIGS. 6 and 7. explain.
As shown in FIG. 7, four fixing members 30 are arranged between the upper battery module 10 and the lower battery module 10. The base portion 31 of the fixing member 30 is arranged at a position where the base portion 31 is substantially parallel to the stacking direction of the battery modules 10 and the center thereof is coaxial with the boss portion 110 of each battery module 10. In this state, the pair of claw portions 32 project from the base portion 31 toward the upper battery module 10 side. Further, the pair of claw portions 33 project from the base portion 31 toward the lower battery module 10 side.

The pair of claws 33 of the fixing member 30 are fitted to the boss portion 110 of the holding case 100 (boss portion 110c of the upper holding case 103) in the lower battery module 10, and are above the pair of claws 32 of the fixing member 30. The boss portion 110 of the holding case 100 (boss portion 110a of the lower holding case 101) of the battery module 10 is fitted.
In this state, the axis of the fixing member 30, that is, the center of the through hole 34 is substantially coaxial with the axis of the boss portion 110. Then, the fastening member 81 is inserted into the through hole 111 of the holding case 100 in the upper battery module 10, the through hole 34 of the fixing member 30, and the through hole 111 of the holding case 100 in the lower battery module 10, and the male screw portion 83 is inserted. , Fasten to the female threaded portion of the nut 61 provided in the lower case 60. This state is shown in FIG. As a result, the battery module laminated structure 1 is produced.

In the state shown in FIG. 6, the upper battery module 10 and the lower battery module 10 are immovably fixed in the vertical direction, that is, in the stacking direction via the fixing member 30. Further, the upper battery module 10 is restricted from moving in the direction orthogonal to the stacking direction by the pair of claws 32 of the fixing member 30, and the lower battery module 10 is laminated by the pair of claws 33 of the fixing member 30. Movement in directions orthogonal to the direction is restricted. That is, the pair of claw portions 32 and the pair of 33 have a function as a regulating portion that regulates the movement of the upper and lower battery modules 10 in the direction orthogonal to the stacking direction.

In the battery module laminated structure 1 shown in the above embodiment, the distance (interval) between the battery modules 10 is changed by changing the thickness (axial length) t (see FIG. 6) of the base portion 31 of the fixing member 30. ) Can be changed. That is, if the fixing member 30 having a thin base portion 31 is used, the distance between the battery modules 10 is small, and if the fixing member 30 having a thick base portion 31 is used, the distance between the battery modules 10 is small. Becomes larger. Therefore, the distance between the battery modules 10 can be adjusted by using the fixing members 30 having different thicknesses of the base portions 31. Moreover, since the fixing member 30 is small in size, has a simple structure, and can be formed by press working, it can be manufactured at low cost.

In the above embodiment, the fixing member 30 is exemplified as a structure having a pair of claw portions 32 and 33 on the opposite side to the base portion 31, respectively. However, two or more pairs of claws 32 and 33 may be provided, respectively. Even in a structure in which two or more pairs of claws 32 and 33 are provided, it is preferable that the claws 32 and 33 are arranged at the same angle in the circumferential direction. Further, it is preferable that the claw portion 32 projecting to one surface side of the base portion 31 and the claw portion 33 projecting to the other surface side of the base portion 31 are alternately arranged on the outer peripheral side of the base portion 31. Further, it is preferable that the plurality of claw portions 32 and the plurality of claw portions 33 are arranged line-symmetrically with respect to a straight line passing through the center of the through hole 34, respectively. However, it is not necessary to arrange the plurality of claw portions 32 or the plurality of claw portions 33 so that they are all paired. Further, the number of the claws 32 or 33 is not limited to an even number, and may be an odd number. Furthermore, the width of each claw portion 32 or each claw portion 33, in other words, the length in the circumferential direction may not be the same but may be different. Further, the total number of the claws 32 protruding toward one surface of the base portion 31 may be different from the total number of the claws 33 protruding toward the other surface of the base portion 31.

According to the first embodiment, the following effects are obtained.
(1) The battery module laminated structure 1 includes a fixing member 30 provided between the first battery module 10 and the second battery module 10, and the fixing member 30 is the first battery module 10 and the first battery module 10. The base portion 31 interposed between the second battery module 10 and the claw portion (regulatory portion) 32 that regulates the movement of the first battery module 10 and the second battery module 10 in the direction orthogonal to the stacking direction. It has 33. Therefore, by using the fixing members 30 having different thicknesses of the base portions 31, the distance between the stacked battery modules 10 can be adjusted.

(2) The first battery module 10 has a convex boss portion 110 protruding toward the second battery module 10, and the second battery module 10 has a convex portion protruding toward the first battery module 10. It has a shaped boss portion 110, and the fixing member 30 is fitted to the lower end portion of the boss portion 110 of the first battery module 10 and the upper end portion of the boss portion 110 of the second battery module 10. Assembling the fixing member 30 and the boss portion 110 only requires fitting the claw portions (regulating portions) 32 and 33 of the fixing member 30 to the boss portion 110, so that the assembling work can be performed efficiently. ..

(3) The regulating portion that regulates the movement of the first and second battery modules 10 in the direction orthogonal to the stacking direction is arranged on the outer peripheral side of the boss portion 110 of one of the battery modules 10, and is arranged from the base portion 31 to the third. A claw portion 32 projecting toward one battery module 10 side and a claw portion arranged on the outer peripheral side of the boss portion 110 of the other battery module 10 and projecting from the base portion 31 toward the second battery module 10 side. It is composed of 33. As described above, the regulating portion that regulates the movement of the first and second battery modules 10 in the direction orthogonal to the stacking direction has a simple structure in which the claw portions 32 and 33 are arranged on the outer peripheral side of the boss portion 110. Orthogonal. Therefore, the regulation structure for restricting the movement of the first and second battery modules 10 in the direction orthogonal to the stacking direction can be simplified and inexpensive.

(4) In the regulation portion described in (3) above, the plurality of claw portions 32 and the plurality of claw portions 33 are on a plane parallel to the base portion 31, that is, a plane in a direction orthogonal to the stacking direction of the battery modules 10. It is arranged at a position where the projections projected on are not overlapped. Moreover, the fixing member 30 is small and has a simple structure, and can be manufactured by, for example, press working. Therefore, the fixing member 30 can be manufactured at low cost.

(5) The base portion 31 of the fixing member 30 has a through hole 34, the boss portion 110 of the first and second battery modules 10 has a through hole 111, and further, the through hole 34 of the base portion 31. A fastening member 81 that penetrates each through hole 111 of each boss portion 110 is provided. Therefore, it is possible to simultaneously fix the first and second battery modules 10 in the stacking direction and regulate the movement in the direction orthogonal to the stacking direction only by fastening with the fastening member, and the assembly work can be performed efficiently. It can be carried out.

-Second embodiment-
FIG. 9 is an exploded perspective view showing a second embodiment of the battery module laminated structure 1 of the present invention, and FIG. 10 is a perspective view in a state where a part of the fixing member 30A shown in FIG. 9 is cut off. .. In FIG. 9, the fastening member 81 and the lower case 60 are not shown.
As shown in FIG. 9, the fixing member 30A in the second embodiment has a cylindrical shape. Specifically, as shown in FIG. 10, the fixing member 30A has a tubular outer peripheral side portion 35 and a base portion 31a provided so as to connect the outer peripheral side portion 35 in the middle in the axial direction. .. A through hole 34 is formed in the center of the base portion 31a. The inner diameter of the outer peripheral side portion 35 is set to a size that allows the boss portion 110 of the holding case 100 in the battery module 10 to be fitted.

At the upper and lower ends of the outer peripheral side portion 35, an inner peripheral tapered surface 35a, an outer peripheral tapered surface 35b, and a flat surface 35c provided between the inner peripheral tapered surface 35a and the outer peripheral tapered surface 35b are formed (however, the outer peripheral tapered surface 35c is formed). Each tapered surface at the lower end is not shown). The fixing member 30A is formed by, for example, a resin mold. However, it may be formed of metal.
The battery module 10 has the same structure as that of the first embodiment, and the corresponding members are designated by the same reference numerals, and the description thereof will be omitted.

The fixing member 30A is arranged between the upper battery module 10 and the lower battery module 10. The boss portion 110 of the holding case 100 (boss portion 110c of the upper holding case 103) of the lower battery module 10 is fitted inward of the portion of the outer peripheral side portion 35 of the fixing member 30A below the base portion 31a. Further, the boss portion 110 of the holding case 100 (boss portion 110a of the lower holding case 101) of the upper battery module 10 is fitted inward of the portion of the outer peripheral side portion 35 of the fixing member 30A above the base portion 31a. .. In this state, the axis of the fixing member 30A, that is, the center of the through hole 34 is substantially coaxial with the boss portion 110. The inner peripheral tapered surfaces 35a provided at the upper and lower ends of the fixing member 30A serve as a guide when fitting the boss portions 110 of the holding case 100 in the upper and lower battery modules 10 into the fixing member 30A.

Then, although not shown in FIG. 9, as in the first embodiment, the fastening member 81 is attached to the through hole 111 of the holding case 100 in the upper battery module 10, the through hole 34 of the fixing member 30, and the lower battery module. The through hole 111 of the holding case 100 in No. 10 is inserted, and the male screw portion 83 of the fastening member 81 is fastened to the nut 61. As a result, the upper battery module 10 and the lower battery module 10 are immovably fixed in the vertical direction, that is, in the stacking direction via the fixing member 30A interposed between the upper battery module 10 and the lower battery module 10. Will be done. Further, the upper and lower battery modules 10 are restricted from moving in the direction orthogonal to the stacking direction by the outer peripheral side portion 35 of the fixing member 30A. That is, the outer peripheral side portion 35 in the second embodiment has a function as a regulating portion that regulates the movement of the upper and lower battery modules 10 in the direction orthogonal to the stacking direction.

In the battery module laminated structure 1 shown in the second embodiment, the distance between the battery modules 10 can be changed by using the fixing members 30A having different thicknesses of the base portion 31a.
Therefore, the second embodiment also has the same effects as the effects (1) to (3) and (5) of the first embodiment. However, in the second embodiment, the claw portions 32 and 33 in the first embodiment are replaced with the outer peripheral side portions 35. Further, in the second embodiment, since the fixing member 30A can be formed by the resin mold, the fixing member 30A can be manufactured at low cost.

-Third embodiment-
FIG. 11 is an external perspective view showing a third embodiment of the battery module laminated structure of the present invention, and FIG. 12 is an exploded perspective view of the battery module laminated structure shown in FIG. FIG. 13 is an external perspective view of the fixing member shown in FIG. FIG. 14 is a cross-sectional view taken along the line XIV-XIV of the battery module laminated structure shown in FIG. 11, and FIG. 15 is a view before assembling the battery module laminated structure shown in FIG.
As shown in FIG. 13, the fixing member 30B of the third embodiment has a base portion 31b, a circular shaft-shaped portion 36 projecting upward from the base portion 31b, and a cross section projecting downward from the base portion 31b. It has a circular shaft-shaped portion 37. The shaft-shaped portion 36 and the shaft-shaped portion 37 are formed line-symmetrically with the base portion 31b as the center. However, it is not always necessary to make the shaft-shaped portion 36 and the shaft-shaped portion 37 line-symmetrical. A tapered tapered portion 36a and a flat portion 36b are formed on the upper portion of the shaft-shaped portion 36, and a tapered tapered portion 37a and a flat portion 37b are formed on the lower portion of the shaft-shaped portion 37. The outer diameters of the shaft-shaped portions 36 and 37 are set to a size that can be fitted into the through hole 111 of the boss portion 110 of the holding case 100 in the battery module 10. The fixing member 30B is formed by, for example, a resin mold. However, it may be formed of metal.

As shown in FIGS. 12 and 15, the fixing member 30B is arranged between the lower battery module 10 and the upper battery module 10. Then, the shaft-shaped portion 37 of the fixing member 30b is fitted into the through hole 111 of the boss portion 110 (boss portion 110c of the upper holding case 103) of the lower battery module 10. Further, the shaft-shaped portion 36 of the fixing member 30b is fitted into the through hole 111 of the boss portion 110 of the holding case 100 (boss portion 110a of the lower holding case 101) in the upper battery module 10. This state is illustrated in FIG. The tapered portions 36a and 37a of the axial portions 36 and 37 of the fixing member 30B fit the axial portions 36 and 37 of the fixing member 30B into the through holes 111 of the boss portions 110 of the holding case 100 in the upper and lower battery modules 10. It will be a guide when you do.

As shown in FIG. 14, the heights (lengths in the vertical direction) of the axial portions 36 and 37 of the fixing member 30B are smaller than the height of the battery module 10, respectively. Therefore, the through hole 111 formed in the battery module 10 can be a recess deeper than the length of the shaft-shaped portions 36, 37.

In the state shown in FIG. 14, the upper and lower battery modules 10 are restricted from moving in the direction orthogonal to the stacking direction by the axial portions 36 and 37 of the fixing member 30B. That is, the axial portions 36 and 37 in the third embodiment have a function as a regulating portion that regulates the movement of the upper and lower battery modules 10 in the direction orthogonal to the stacking direction.

In the third embodiment, the fastening member 81 such as a bolt cannot be inserted into the through hole 111 of the boss portion 110 of the battery module 10 to which the fixing member 30B is fitted. Therefore, unlike the first and second embodiments, it is necessary to adopt another fixed structure. As a structure for fixing the upper and lower battery modules 10 to which the fixing member 30B is fitted to the lower case 60, for example, each battery module has a boss portion having a through hole for inserting a fastening member 81 such as a bolt. There is a method of providing 10 separately. Alternatively, as shown by a dotted line in FIG. 14, a fastening member 85 having an engaging portion 84 that engages with a through hole 111 of each boss portion 110 of the holding case 100 in the upper battery module 10 is inserted into the through hole of the lower case 60. The structure may be such that it is inserted and fastened with a nut 62 on the lower end side. Further, the fixing member 30B can be modified as shown below.

(Modification 1 of the third embodiment)
FIG. 16 is a cross-sectional view of a modified example 1 of the fixing member as the third embodiment shown in FIG.
The fixing member 30B1 shown in FIG. 16 has a structure in which a through hole 36c penetrating in the axial direction is formed in the fixing member 30B shown in FIG. 13 and the like.
That is, the fixing member 30B1 is provided with a through hole 36c that penetrates the base portion 31b and the shaft-shaped portions 36 and 37 at the axial center. Therefore, a fastening member 81 such as a bolt is inserted through the through hole 36c, and the battery modules 10 laminated via the fixing member 30B1 are fixed to the lower case 60 as in the first and second embodiments. Can be done. The fixing member 30B1 can also be manufactured by a resin mold.

(Modification 2 of the third embodiment)
FIG. 17 is a cross-sectional view of a modified example 2 of the fixing member as the third embodiment shown in FIG.
In the fixing member 30B2 illustrated in FIG. 17, a fastening shaft portion 36d having a male screw portion 36e at the end is formed on the flat portion 36b of the shaft-shaped portion 36. Further, a fastening shaft portion 37d having a male screw portion 37e at the end is formed on the flat portion 37b of the shaft-shaped portion 37 of the fixing member 30B2.
Therefore, the fastening shaft portion 37d penetrates the through hole 111 of the boss portion 110 of the lower battery module 10, and the male screw portion 37e protruding from the lower case 60 is fitted with a nut 62 from the lower surface side of the lower case 60 (see FIG. 14). Can be fastened to fix the lower battery module 10 between the base portion 31b and the lower case 60. Further, the fastening shaft portion 36d is passed through the through hole 111 of the boss portion 110 of the holding case 100 in the upper battery module 10, and a nut 62 (not shown) is fastened to the male screw portion 36e protruding from the battery module 10 to be upward. Battery module 10 can be fixed.

In order to manufacture the fixing member 30B2, the base portion 31b and the shaft-shaped portions 36 and 37 may be integrally molded by resin molding or machining of a metal member. When the fixing member 30B2 is formed by resin molding, it may be formed by insert molding in which the fastening shafts 36d and 37d are made of metal. Alternatively, the fastening shaft portions 36d and 37d of the fixing member 30B may be manufactured as separate members from the fixing member 30B shown in FIG. 13, and both members may be assembled to manufacture the fixing member 30B2. To assemble the fastening shafts 36d and 37d manufactured as separate members to the fixing member 30B, for example, female threads are formed on the shaft-shaped portions 36 and 37 of the fixing member 30B, and male threads are formed on the fastening shafts 36d and 37d. The portions can be formed and fixed by screw fastening, or integrated by welding.

Also in the third embodiment, the spacing between the stacked battery modules 10 can be adjusted by using the fixing members 30B, 30B1 and 30B2 having different thicknesses of the base portion 31b. Therefore, the third embodiment also has the same effect as the effect (1) of the first embodiment.
Further, since the fixing members 30, 30B1 and 30B2 need only be fitted in the through hole 111 of the boss portion 110 of the battery module 10, the assembling work can be performed efficiently. Further, the fixing members 30, 30B1 and 30B2 can be manufactured by molding (including insert molding), and can be inexpensive.

− Fourth Embodiment −
FIG. 18 is an exploded perspective view showing a fourth embodiment of the battery module laminated structure 1 of the present invention.
In the first to third embodiments, the battery module laminated structure 1 in which the battery modules 10 accommodating the cylindrical secondary battery cells 21 are laminated is exemplified. However, the battery module laminated structure 1 can be made by stacking the battery modules 10A in which the square secondary battery cells are housed.
Each battery module 10A constituting the battery module laminated structure shown in FIG. 18 has a pair of side plates 141 for having a large number of square secondary battery cells 28, and a pair of end plates 142. The secondary battery cells 28 have a flat rectangular parallelepiped shape and are arranged so as to be overlapped in the thickness direction. The pair of side plates 141 are arranged on both sides of each secondary battery cell 28 so as to extend along the arrangement direction of the secondary battery cells 28. The pair of end plates 142 are arranged in front of the secondary battery cell 28 on the starting end side of the row of the arranged secondary battery cells 28 and behind the secondary battery cell 28 on the terminating side.

Each secondary battery cell 28 has a positive electrode external terminal 28p and a negative electrode external terminal 28n. The positive electrode external terminal 28p and the negative electrode external terminal 28n each project upward from the upper surface of the secondary battery cell 28. Each secondary battery cell 28 has a gas discharge valve 146 arranged between the positive electrode external terminal 28p and the negative electrode external terminal 28n. Although not shown, each secondary battery cell 28 has a power generation unit formed of wound positive and negative electrode sheets inside. The positive and negative electrode external terminals 28p and 28n are connected to the positive and negative electrode sheets of the power generation unit, respectively. Adjacent secondary battery cells 28 are arranged so that the positive electrode external terminal 28p and the negative electrode external terminal 28n face each other so that the front and back sides are alternately reversed. Although not shown, the positive electrode external terminal 28p and the negative electrode external terminal 28n of the adjacent secondary battery cells 28 are connected by a bus bar, and all the secondary battery cells 28 are electrically connected in series.

Cell holders 143 are arranged on both sides of each secondary battery cell 28 in the arrangement direction. Each of the secondary battery cells 28 is arranged in a state in which approximately half of the thickness (length in the arrangement direction) is accommodated in each of the cell holders 143 arranged on both sides. The end cell holder 144 is arranged in front of the secondary battery cell 28 on the start end side of the row of the secondary battery cells 28 and behind the secondary battery cell 28 on the end side of the row of the secondary battery cells 28. .. The thickness of the end cell holder 144 (length in the arrangement direction) is about half the thickness of the cell holder 143, and accommodates only one secondary battery cell 28 on the start end side or the end side.

The pair of side plates 141 are fixed to the end plates 142 with the cell holder 143 and the end cell holder 144 containing the secondary battery cell 28 arranged between the pair of end plates 142. The side plate 141 is fixed to the side surface of the end plate 142 by bolts 145. The cell holder 143 and the end cell holder 144 are held in a state of being sandwiched by a pair of end plates 142.

Through holes 142a penetrating in the vertical direction, that is, in the direction orthogonal to the stacking direction of the secondary battery cells 28, are formed on the side portion of each end plate 142 near the side plate 141.
A fixing member 30C is provided between the upper battery module 10A and the lower battery module 10A.
The fixing member 30C has a structure similar to that of the fixing member 30B shown in FIG. 13, and has a base portion 31c and shaft-shaped portions 36 and 37. However, the thickness t of the base portion 31c is larger than the thickness t of the base portion 31b of the fixing member 30B shown in FIG. This is to prevent the positive and negative electrode external terminals 28p and 28n from coming into contact with the upper layer battery module 10A. The outer diameters of the shaft-shaped portions 36 and 37 of the fixing member 30C are large enough to fit the through hole 111a of the battery module 10A, and the diameter of the base portion 31c is formed to be larger than the diameter of the through hole 111a of the battery module 10A. Has been done.

As in the case of the third embodiment, the shaft-shaped portion 37 of the fixing member 30C is fitted into the through hole 142a of the end plate 142 in the lower battery module 10A. Further, the shaft-shaped portion 36 of the fixing member 30C is fitted into the through hole 142a of the end plate 142 in the upper battery module 10A. As a result, the upper and lower battery modules 10A are restricted from moving in the direction orthogonal to the stacking direction by the axial portions 36 and 37 of the fixing member 30C. That is, the axial portions 36 and 37 in the fourth embodiment have a function as a regulating portion that regulates the movement of the upper and lower battery modules 10A in the direction orthogonal to the stacking direction.

Therefore, the fourth embodiment also has the same effect as that of the third embodiment.
In the fourth embodiment, the battery modules 10A stacked vertically are provided with another through hole in the end plate 142 for inserting the fastening member 81, as in the third embodiment, and are not shown. It is fixed to the lower case 60 of. Alternatively, the fastening member 85 having the engaging portion 84 is inserted into the through hole 142a of the end plate 142 and fixed to the lower case 60 (not shown). Alternatively, as in the third embodiment, the structure is the same as that of the fixing member 30B1 of the modified example 1 shown in FIG. 16 or the fixing member 30B2 of the modified example 2 shown in FIG. Further, in the fourth embodiment, the fixing member 30 shown in FIG. 8 of the first embodiment is used instead of the fixing member 30C, or the fixing member 30A shown in FIG. 10 of the second embodiment is used. be able to. However, when the fixing members 30 and 30A are used, it is necessary to provide the end plate 142 with a boss portion into which the claw portions 32 and 33 of the fixing member 30 or the outer peripheral side portion 35 of the fixing member 30A are fitted.

In the first and second embodiments, the holding case 100 is provided with a circular boss portion 110 to which the claw portions 32 and 33 of the fixing member 30 or the outer peripheral side portion 35 of the fixing member 30A are fitted. did. However, the boss portion 110 is not limited to a circular shape, and may be a polygonal shape or an elliptical shape. Further, the boss portion 110 is not limited to a structure that is continuously provided in the height direction (vertical direction) of the battery module 10, and may be a convex portion that protrudes on the facing side with the other party to be laminated.

In the first and second embodiments, the holding case 100 is illustrated as a structure composed of three case members, a lower holding case 101, a middle holding case 102, and an upper holding case 103. However, the holding case 100 is not limited to such a structure, and may be composed of two case members or four or more case members.

In each of the above embodiments, bolts are exemplified as the fastening member 81. However, the fastening member 81 may be a shaft-shaped member such as a pin, and the fixing method may be caulking or welding instead of screw fastening.

In each of the above embodiments, the battery module laminated structure 1 is exemplified as a structure in which a battery module 10 containing a cylindrical or square lithium ion secondary battery cell 21 is laminated. However, the present invention can be applied to a structure in which a battery module 10 containing a secondary battery cell 21 using a water-soluble electrolytic solution such as a nickel hydrogen battery cell, a nickel cadmium battery cell, or a lead storage battery cell is laminated. It is possible. Further, the present invention can also be applied to a power storage module laminated structure in which power storage modules containing storage cells other than secondary battery cells such as a lithium ion capacitor are stacked.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Each of the above embodiments and modifications may be combined or modified within the scope of the gist of the present invention, and other aspects considered within the scope of the technical idea of the present invention are also within the scope of the present invention. included.

1 Battery module laminated structure (storage module laminated structure)
10 Battery module (storage module)
10A battery module (power storage module)
21 Rechargeable battery cell (storage cell)
30, 30A, 30B, 30B1, 30B2, 30C Fixing members 31, 31a, 31b, 31c Base part 32.33 Claw part (regulatory part)
34 Through hole 35 Outer peripheral side (regulatory part)
36, 37 Shaft-shaped part (regulatory part)
81 Fastening member (shaft member)
110, 100a, 100b, 100c Boss portion 111 through hole

Claims (12)

A first power storage module and a second power storage module, which are stacked facing each other and house a power storage cell inside, respectively.
A fixing member provided between the first power storage module and the second power storage module is provided.
The fixing member is
A base portion interposed between the first power storage module and the second power storage module,
A power storage module laminated structure having a first power storage module and a regulation unit that regulates movement of the second power storage module in a direction orthogonal to the stacking direction. In the power storage module laminated structure according to claim 1,
The first power storage module has a first convex portion that protrudes toward the second power storage module side.
The second power storage module has a second convex portion that protrudes toward the first power storage module side.
The regulating portion is a power storage module laminated structure fitted to the first convex portion and the second convex portion. In the power storage module laminated structure according to claim 2.
The regulatory department
A first claw portion that is arranged on the outer peripheral side of the first convex portion and projects from the base portion toward the first power storage module side.
A power storage module laminated structure that is arranged on the outer peripheral side of the second convex portion and includes a second claw portion that protrudes from the base portion toward the second power storage module side. In the power storage module laminated structure according to claim 3.
The first convex portion of the first power storage module, the second convex portion of the second power storage module, and the base portion of the fixing member each have a through hole.
Further, a power storage module laminated structure including a shaft-shaped member penetrating the first convex portion, the second convex portion, and the through holes of the base portion. In the power storage module laminated structure according to claim 3.
A power storage module laminated structure having a plurality of the first claw portions and a plurality of the second claw portions. In the power storage module laminated structure according to claim 5.
The plurality of first claws and all of the plurality of second claws are storage module laminated structures arranged at positions where projections projected on a plane in a direction orthogonal to the stacking direction do not overlap. In the power storage module laminated structure according to claim 6.
The plurality of first claws are arranged at predetermined angles in the circumferential direction.
The plurality of second claws are storage module laminated structures arranged in the middle of the first claws at predetermined angles in the circumferential direction. In the power storage module laminated structure according to claim 7.
The base portion has a through hole, and the plurality of first claw portions are arranged on the outer periphery of the base portion so as to be line-symmetric with respect to a straight line passing through the center of the through hole, and the plurality of second claw portions are arranged. The claw portion is a storage module laminated structure arranged on the outer periphery of the base portion so as to be line-symmetric with respect to a straight line passing through the center of the through hole. In the power storage module laminated structure according to claim 2.
The regulating portion includes a first regulating portion formed in a tubular shape surrounding the outer periphery of the first convex portion, and a second regulating portion formed in a tubular shape surrounding the outer circumference of the second convex portion. A power storage module laminated structure having. In the power storage module laminated structure according to claim 1,
The first power storage module and the second power storage module each have a recess or a through hole provided in the stacking direction.
The regulating portion is a first regulating portion that is fitted into the recess or the through hole of the first power storage module, and a second that is fitted into the recess or the through hole of the second power storage module. Power storage module laminated structure including the regulation part of. In the power storage module laminated structure according to claim 10.
The first regulating section and the second regulating section are each a storage module laminated structure formed so as to project in the stacking direction. In the power storage module laminated structure according to claim 11.
The base portion, the first regulating portion, and the second regulating portion each have a through hole.
Further, a power storage module laminated structure including a shaft-shaped member penetrating the through holes of the base portion, the first regulating portion, and the second regulating portion.

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