JP6866405B2 - Battery module, manufacturing method of battery module - Google Patents

Description

The present invention relates to a battery module and a method for manufacturing the battery module.

Conventionally, in the field of rechargeable secondary batteries, aqueous solution batteries such as lead batteries, nickel-cadmium batteries, and nickel-hydrogen batteries have been the mainstream. However, as electric devices have become smaller and lighter, attention has been paid to lithium secondary batteries having a high energy density, and their research, development and commercialization have been rapidly promoted. On the other hand, due to the problems of global warming and depleted fuel, electric vehicles (EVs) and hybrid electric vehicles (HEVs) that partially assist a part of the drive with an electric motor have been developed by each automobile manufacturer and have high capacity and high output as their power source. Secondary batteries are being sought after. As a power source that meets such requirements, a non-aqueous lithium secondary battery having a high voltage is drawing attention. In particular, since the square lithium secondary battery is excellent in volumetric efficiency when packed, expectations for the development of a square lithium secondary battery for HEV or EV are increasing. Patent Document 1 discloses a secondary battery module having a low profile due to a module structure in which a large number of secondary batteries are stacked in a flat position.

U.S. Pat. No. 9,406916

In the invention described in Patent Document 1, it could not be uniformly fastened so as to efficiently radiate the plurality of battery groups.

The battery module according to the first aspect of the present invention includes a first battery group in which a plurality of battery cells are stacked in the first direction, and a second battery in which a plurality of battery cells are stacked in the first direction. A second block member that sandwiches the first battery group together with the group, the first block member arranged between the first battery group and the second battery group, and the first block member. A third block member that sandwiches the second battery group together with the first block member, the first battery group, the second battery group, the first block member, and the second A block member and a lashing plate for lashing the third block member are provided, and the first battery group, the second battery group, the first block member, the second block member, and the like. The third block member is arranged side by side in a second direction orthogonal to the first direction, and the lashing plate is the first battery group, the second battery group, and the first block member. , The second block member and the third block member are arranged so as to overlap with each other in the first direction, and the lashing plate positions the second block member and the third block member. A positioning unit for performing is provided.
The method for manufacturing a battery module according to the second aspect of the present invention includes a first battery group in which a plurality of battery cells are stacked in the first direction, and a first battery group in which a plurality of battery cells are stacked in the first direction. The second battery group sandwiches the first battery group together with the second battery group, the first block member arranged between the first battery group and the second battery group, and the first block member. The block member, the third block member that sandwiches the second battery group together with the first block member, the first battery group, the second battery group, the first block member, and the above. A method for manufacturing a battery module including a second block member and a lashing plate for lashing the third block member, wherein the lashing plate is the second block member and the third block member. A positioning unit for positioning the block member is provided, and the first battery group, the second battery group, the first block member, the second block member, and the third block member are the first. The second block member and the third block member are pressed side by side in the second direction orthogonal to the direction of the above, and pressed in the direction of sandwiching the first battery group and the second battery group. While maintaining the pressing, the lashing plate is fastened to the first block member, the second block member, and the third block member in a state of being positioned by the positioning portion.

According to the present invention, a plurality of battery groups can be evenly bound so as to efficiently dissipate heat.

External perspective view of the battery module An exploded perspective view of the first battery group and the second battery group Longitudinal exploded perspective view of the battery module An exploded perspective view of the battery modules in the stacking direction Top view of the battery module The figure which shows the protrusion and the hole in the modification 1. The figure which shows the protrusion and the hole in the modification 2

-Embodiment-
Hereinafter, the first embodiment of the battery module will be described with reference to FIGS. 1 to 4.
FIG. 1 is an external perspective view of the battery module 1 according to the present invention. The battery module 1 includes a first battery group 11 in which a plurality of battery cells are stacked, a second battery group 12 in which a plurality of battery cells are stacked, a first block member 13, and a second block member. 14, the third block member 15, and a pair of lashing plates that collectively tie the first battery group 11 and the second battery group 12, that is, the upper lashing plate 16 and the lower lashing plate 17. To be equipped. The first block member 13 is arranged between the first battery group 11 and the second battery group 12. The second block member 14 sandwiches the first battery group 11 together with the first block member 13. The third block member 15 sandwiches the second battery group 12 together with the first block member 13.

As shown in FIG. 1, the first battery group 11, the second battery group 12, the first block member 13, the second block member 14, and the third block member 15 are arranged side by side in the left-right direction of FIG. The upper lashing plate 16 and the lower lashing plate 17 are arranged so as to sandwich them from the vertical direction shown in the drawing. The upper lashing plate 16 and the lower lashing plate 17 are fastened to the first block member 13, the second block member 14, and the third block member 15 with fastening bolts 18. Hereinafter, the left-right direction of FIG. 1 is referred to as the longitudinal direction of the battery module 1, the vertical direction of FIG. 1 is referred to as the stacking direction of the battery modules 1, and the depth direction of FIG. 1 is referred to as the depth direction of the battery module 1. In the following, the upper lashing plate 16 and the lower lashing plate 17 are collectively referred to as a lashing plate 67, and the first block member 13, the second block member 14, and the third block member 15 are collectively blocked. It is called a member 345.

The dimensions of the block member 345 in the stacking direction are smaller than the dimensions of the first battery group 11 and the second battery group 12 in the stacking direction. In other words, each of the first battery group 11 and the second battery group 12 protrudes toward the lashing plate 67 from the second block member 14 and the third block member 15 in the stacking direction. Further, the shape of the lashing plate 67 is bent so as to follow the stacking direction of the block member 345, the first battery group 11, and the second battery group 12. In other words, the surface of the lashing plate 67 in contact with the block member 345 protrudes toward the second block member 14 and the third block member 15 from the first battery group 11 and the second battery group 12. ..

The difference between the dimensions of the block member 345 in the stacking direction and the dimensions of the first battery group 11 and the second battery group 12 in the stacking direction is at least the height of the head of the fastening bolt 18. Therefore, even when the lashing plate 67 is fastened to the block member 345 using the fastening bolt 18, the fastening bolt 18 does not protrude from the outer shape of the battery module 1, and the height of the battery module 1 is reduced.

FIG. 2 is an exploded perspective view of the first battery group 11 and the second battery group 12. In each of the first battery group 11 and the second battery group 12, the battery cell 21 and the double-sided protrusion insulating plate 22 having protrusions for holding the battery cell 21 are alternately laminated, and one side thereof is on the upper and lower ends thereof. The protrusion insulating plate 23 is arranged. The battery cell 21 is, for example, a lithium ion secondary battery. The battery cell 21 has a flat rectangular parallelepiped shape, and has a wide surface in front of the drawing, left and right side surfaces in the drawing, and flat surfaces in the upper and lower sides in the drawing. A positive electrode external terminal is provided near one end side of the wide surface of the battery cell 21, and a negative electrode external terminal is provided near the other end side. The battery cells 21 are laminated so that the front and back surfaces of the flat surfaces face each other and the positive electrode external terminals and the negative electrode external terminals are alternately arranged on opposite sides.

The double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 are formed of, for example, a resin such as PBT (polybutylene terephthalate). The double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 have a plurality of protrusions on at least one surface of a rectangular sheet-shaped base material. The double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 may be formed by attaching another sheet-shaped member cut according to the protrusion shape to the surface of the sheet-shaped base material, or a sheet having protrusions. It may be integrally formed as a shaped member. As shown in FIG. 2, the protrusions exist discontinuously in the depth direction of the battery module 1 and symmetrically shown in the drawing, and have a predetermined length in the longitudinal direction. When pressed, the protrusions strengthen the lashing between the battery cells 21 or between the battery cells 21 and the lashing plate 67. The double-sided protrusion insulating plate 22 arranged between the battery cells 21 has protrusions on both sides, and the single-sided protrusion insulating plate 23 arranged between the battery cell 21 and the lashing plate 67 is in contact with the battery cell 21. It has protrusions only on the side. That is, in FIG. 2, the state of the back surface of the double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 is not shown because of the viewpoint from above, but the upper part of the drawing in contact with all the double-sided protrusion insulating plates 22 and the upper lashing plate 16. The single-sided protrusion insulating plate 23 has a protrusion on the back surface. The length of each side of the double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 is the same as or shorter than the length of each side of the flat surface of the battery cell 21. Therefore, as will be described later, the double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 do not interfere with the heat dissipation of the battery cell 21.

FIG. 3 is an exploded perspective view of the battery module 1 in the longitudinal direction. However, in FIG. 3, the lashing plate 67 is omitted. The first battery group 11 comes into contact with the first block member 13 and the second block member 14 via the heat transfer sheet 31, and the second battery group 12 comes into contact with the first block member via the heat transfer sheet 31. It comes into contact with 13 and the third block member 15. The heat transfer sheet 31 is a sheet-like member having high thermal conductivity, and is deformed and adhered to each other when pressed. Therefore, by assembling the battery module 1 by the method described later, the heat generated by the first battery group 11 and the second battery group 12 can be efficiently transferred to the respective block members via the heat transfer sheet 31. Since the double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 shown in FIG. 2 are assembled so as not to protrude from the side surfaces of the first battery group 11 and the second battery group 12, each battery cell transfers heat. It comes into direct contact with the sheet 31 and efficiently dissipates heat.

FIG. 4 is an exploded perspective view of the battery module 1 in the stacking direction. The battery module 1 is provided with an upper lashing plate 16 and a lower lashing plate 17 so as to sandwich the members shown in FIG. 3 in the stacking direction. As a result, the first battery group 11, the second battery group 12, and the block member 345 are vertically fixed so as to overlap the surfaces orthogonal to the stacking direction, that is, the surfaces facing each other in the vertical direction of FIG. The plate 16 and the lower lashing plate 17 are arranged. The upper lashing plate 16 and the lower lashing plate 17 extend in the longitudinal direction and the depth direction, and are provided with holes 42 which are positioning portions for positioning the second block member 14 and the third block member 15. Be done. The second block member 14 and the third block member 15 are provided with protrusions 41 corresponding to the holes 42, and by fitting the protrusions 41 into the holes 42, the upper lashing plate 16, the lower lashing plate 17, and the like. The relative positional relationship between the second block member 14 and the third block member 15 is a predetermined positional relationship. Therefore, by fastening the protrusion 41 into the hole 42 using the fastening bolt 18, the upper lashing plate 16 and the lower lashing plate 17 are maintained in a positional relationship so as to face each other. Since the first battery group 11 and the second battery group 12 are sandwiched between them, the first battery group 11 and the second battery group 12 are uniformly pressed.

Further, the longitudinal positions of the protrusions 41 and holes 42 are based on the longitudinal dimensions of the first battery group 11, the second battery group 12, and the first block member 13 and the thickness of the heat transfer sheet 31. It is set as follows. That is, when the protrusions 41 of the second block member 14 and the third block member 15 are fitted into the holes 42, the second block member 14, the first battery group 11, and the first block member 13 , The second battery group 12 and the third block member 15 are in close contact with each other. Therefore, the longitudinal direction of the battery module 1 is closely held by fastening with the fastening bolt 18 in a state where the protrusion 41 is fitted into the hole 42. By being held in close contact with each other in this way, the heat transfer sheet 31 is crushed to increase the heat transfer area and reduce the thickness of the heat transfer sheet 31, so that the first battery group 11 and the second battery group are reduced. The heat generated by 12 is efficiently transferred to each block member via the heat transfer sheet 31. That is, the cooling performance can be improved.

The protrusion 41 is created by press-fitting a pin into a pin insertion port which is a round hole (not shown). Since the pin insertion port is a round hole, high-precision machining, that is, position accuracy and dimensional accuracy can be easily realized as compared with other shapes. Further, since the protrusion 41 has a pin inserted in the hole, it is superior in strength as compared with cutting.

The positions of the protrusion 41 and the hole 42 in the depth direction will be described with reference to FIG. FIG. 5 is a plan view of the battery module 1, and only the upper lashing plate 16 is shown. In FIG. 5, the fastening bolt 18 is indicated by a circle, and the hole 42 is indicated by a double circle. Further, in order to determine the respective positions of the fastening bolts 18, the symbols 18a to 18g are assigned. As shown in FIG. 5, the holes 42 of the upper lashing plate 16 are arranged at both ends in the longitudinal direction of the battery module 1 and substantially in the center in the depth direction. Therefore, the upper lashing plate 16 is kept in a state where the first battery group 11 and the second battery group 12 are compressed and lashed in a well-balanced manner by using the fastening bolts 18 arranged at the four corners, that is, 18a, 18b, 18f, and 18g. be able to.

The hole 42 provided in the lower lashing plate 17 is also arranged in the center in the depth direction of the battery module 1 like the upper lashing plate 16. Further, the protrusions 41 provided on the second block member 14 and the third block member 15 are arranged at positions corresponding to the holes 42 of the upper lashing plate 16, that is, at the center in the depth direction of the battery module 1. In other words, the holes 42 of the upper lashing plate 16 and the lower lashing plate 17 correspond to the protrusions 41 arranged at the central portions of the second block member 14 and the third block member 15 in the depth direction. Each position is formed.

(Production method)
The manufacturing method of the battery module 1 will be described.
As the first procedure, as shown in FIG. 2, the battery cells 21 and the double-sided protrusion insulating plate 22 are alternately laminated, and the single-sided protrusion insulating plate 23 is arranged at the upper and lower ends thereof. A second battery group 12 is formed. At this time, the double-sided protrusion insulating plate 22 and the single-sided protrusion insulating plate 23 are assembled so as not to protrude from the side surfaces of the first battery group 11 and the second battery group 12. As a second procedure, as shown in FIG. 3, from the left hand side in the longitudinal direction, the second block member 14, the first battery group 11, the first block member 13, the second battery group 12, and the third block. The member 15 is arranged. However, a heat transfer sheet 31 is sandwiched between each block member and the battery group.

As a third procedure, the members arranged in the second procedure are pressed in the longitudinal direction so that each member is in close contact with the adjacent member. This pressed state is maintained until the fifth step is completed. As a fourth procedure, the protrusion 41 provided on the second block member 14 and the third block member 15 and the hole 42 provided on the lashing plate 67 are fitted together. As a fifth procedure, the fastening bolts 18 are used to fix the respective block members and the lashing plate 67. The battery module 1 is manufactured by the above procedure.

According to the first embodiment described above, the following effects can be obtained.
(1) The battery module 1 includes a first battery group 11 in which a plurality of battery cells 21 are laminated in the first direction, that is, a stacking direction, and a second battery in which a plurality of battery cells 21 are stacked in the stacking direction. A second block member 13 arranged between the group 12, the first battery group 11 and the second battery group 12, and a second battery group 11 sandwiching the first battery group 11 together with the first block member 13. The block member 14, the third block member 15 that sandwiches the second battery group 12 together with the first block member 13, the first battery group 11, the second battery group 12, the first block member 13, A second block member 14 and a lashing plate 67 for lashing the third block member 15 are provided. The first battery group 11, the second battery group 12, the first block member 13, the second block member 14, and the third block member 15 are in the second direction orthogonal to the stacking direction, that is, in the longitudinal direction. Arranged side by side. The lashing plate 67 is arranged so as to be overlapped with the first battery group 11, the second battery group 12, the first block member 13, the second block member 14, and the third block member 15 in the stacking direction. .. The lashing plate 67 includes a positioning portion for positioning the second block member 14 and the third block member 15, that is, a hole 42.

Since the battery module 1 is positioned by the protrusion 41 and the hole 42, the positions of the upper lashing plate 16 and the lower lashing plate 17 do not shift. Therefore, the first battery group 11 and the second battery group 12 can be evenly fixed. Further, since the first battery group 11 and the second battery group 12 can be fixed at once by using the pair of binding plates 67, that is, the upper binding plate 16 and the lower binding plate 17, the first battery can be fixed. The assembly man-hours can be reduced and the production efficiency is good as compared with the case where the group 11 and the second battery group 12 are individually fixed. That is, the battery module 1 can efficiently and evenly bind a plurality of battery groups.

(2) Each of the first battery group 11 and the second battery group 12 protrudes toward the lashing plate 67 from the second block member 14 and the third block member 15 in the stacking direction. The surface of the lashing plate 67 on which the holes 42 are formed protrudes toward the second block member 14 and the third block member 15 from the first battery group 11 and the second battery group 12.
Therefore, the presence of the fastening bolt 18 for fastening the lashing plate 67 and the block member 345 prevents the height of the battery module 1 in the stacking direction from increasing, and the height of the battery module 1 can be reduced. Specifically, in the present embodiment, the difference between the dimensions of the block member 345 in the stacking direction and the dimensions of the first battery group 11 and the second battery group 12 in the stacking direction is sufficiently large, so that the fastening bolts The head of 18 is hidden between the first battery group 11 and the second battery group 12, and the battery module 1 is lowered in height.

(3) The positioning portion is a hole 42. The second block member 14 and the third block member 15 have a convex portion, that is, a protrusion 41, and the protrusion 41 is fitted into the hole 42. By forming the protrusion 41 with a combination of a pilot hole and a positioning pin, the position accuracy and the dimensional accuracy can be improved, and the strength is superior to that of the machined portion.

(4) The lashing plate 67 extends in a third direction orthogonal to the stacking direction and the longitudinal direction, that is, in the depth direction. The positioning portion of the lashing plate 67 is formed at a position corresponding to the central portion of the second block member 14 and the third block member 15 in the depth direction. Therefore, the fastening bolts 18 can be arranged at the four corners of the upper lashing plate 16 to maintain a well-balanced state in which the first battery group 11 and the second battery group 12 are compressed and lashed. The fastening bolts 18 arranged at the four corners of the upper lashing plate 16 are, for example, the fastening bolts 18a, 18b, 18f, and 18g shown in FIG.

(5) In the method of manufacturing the battery module 1, the first battery group 11, the second battery group 12, the first block member 13, the second block member 14, and the third block member 15 are arranged in the stacking direction. Arranged in the longitudinal direction orthogonal to each other, the second block member 14 and the third block member 15 are pressed in the direction of sandwiching the first battery group 11 and the second battery group 12, and the positioning is performed while maintaining the pressing. The lashing plate 67 is fastened to the first block member 13, the second block member 14, and the third block member 15 in a state of being positioned by the portion. Therefore, the first battery group 11 and the second battery group 12 can be easily and evenly fixed.

-Modification example 1-
The protrusions 41 formed on the second block member 14 and the third block member 15 may be formed integrally with the block member. The protrusion 41 is formed by, for example, cutting. FIG. 6 is a diagram showing a protrusion 41 and a hole 42 in the first modification. Similar to the above-described embodiment, the protrusion 41 provided on the second block member 14 is fitted into the hole 42 provided on the upper lashing plate 16.

-Modification example 2-
Protrusions may be formed on the lashing plate 67, and holes may be formed on the second block member 14 and the third block member 15. FIG. 7 is a diagram showing a protrusion 61 formed on the lashing plate 67 in the second modification and a hole 62 formed on the second block member 14 and the third block member 15. The protrusion 61 is formed by, for example, sheet metal processing, and the hole 62 is formed, for example, a square hole so as to match the shape of the protrusion 61.
According to this modification 2, the battery module 1 has the following configuration.
(1) The positioning portion is a convex portion, that is, a protrusion 61, and the second block member and the third block member have holes 62. The protrusion 61 of the lashing plate 67 is fitted into the hole 62 of the second block member and the third block member, respectively.

-Modification example 3-
The battery module 1 may include three or more battery groups. In that case, the first block member 13 and the heat transfer sheet 31 are added according to the number of battery groups, and the dimensions of the lashing plate 67 in the longitudinal direction are adjusted. However, the positions of the holes 42 of the lashing plate 67 are both ends in the longitudinal direction and the center in the depth direction of the battery module 1 as described with reference to FIG. The configuration of the second block member 14 and the third block member 15 is the same as that of the embodiment. That is, the battery module 1 maintains a state in which the battery groups are compressed and fixed in a well-balanced manner by fastening the four corners of the fixing plate 67 with the fastening bolts 18 regardless of the number of battery groups to be fixed.

-Modification example 4-
The bottom surface of the housing in which the battery module 1 is housed may be used as the lower lashing plate 17. In this case, the bottom surface of the housing is shaped like the lower lashing plate 17, and the member shown in FIG. 3 is pressed in the longitudinal direction to be inserted into the housing and engaged with the upper lashing plate 16 to engage the fastening bolt 18. Fix with.

-Modification example 5-
In the above-described embodiment, the heat transfer sheet 31 is used to bring the battery module and the block member into close contact with each other. However, instead of the heat transfer sheet 31, a member having a thermal conductivity higher than that of air, such as heat conductive grease, is used. You may use it.

Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other aspects conceivable within the scope of the technical idea of the present invention are also included within the scope of the present invention.

The disclosure content of the next priority basic application is incorporated here as a quotation.
Japanese Patent Application No. 019869 (filed on February 6, 2017)

1 ... Battery module 11 ... First battery group 12 ... Second battery group 13 ... First block member 14 ... Second block member 15 ... Third block member 16 ... Upper lashing plate 17 ... Lower lashing Plate 18 ... Fastening bolt 21 ... Battery cell 22 ... Double-sided protrusion Insulation plate 23 ... Single-sided protrusion Insulation plate 31 ... Heat transfer sheet 41 ... Protrusion 42 ... Hole 61 ... Protrusion 62 ... Hole 67 ... Fastening plate 345 ... Block member

Claims (7)

A first group of batteries in which multiple battery cells are stacked in the first direction,
A second battery group in which a plurality of battery cells are stacked in the first direction, and
A first block member arranged between the first battery group and the second battery group,
A second block member that sandwiches the first battery group together with the first block member,
A third block member that sandwiches the second battery group together with the first block member,
The first battery group, the second battery group, the first block member, the second block member, and a lashing plate for lashing the third block member are provided.
The first battery group, the second battery group, the first block member, the second block member, and the third block member are arranged in a second direction orthogonal to the first direction. Placed,
The lashing plate is a single plate-shaped member from the second block member to the third block member.
The lashing plate is overlapped with the first battery group, the second battery group, the first block member, the second block member, and the third block member in the first direction. Placed,
The lashing plate includes a positioning unit for positioning the second block member and the third block member, the first battery group, the second battery group, the first block member, and the like. A second block member, a fixing portion for fixing the third block member, and a heat transfer sheet made of a member having a thermal conductivity higher than that of air are provided.
The first battery group comes into contact with the first block member and the second block member via the heat transfer sheet.
The second battery group is a battery module configured to come into contact with the first block member and the third block member via the heat transfer sheet. In the battery module according to claim 1,
Each of the first battery group and the second battery group protrudes toward the lashing plate from the second block member and the third block member in the first direction.
The surface of the lashing plate on which the positioning portion is formed is a battery that projects toward the second block member and the third block member from the first battery group and the second battery group. module. In the battery module according to claim 1 or 2.
The positioning part is a hole
The second block member and the third block member have a convex portion and have a convex portion.
The convex portion is a battery module fitted in each of the holes. In the battery module according to claim 1 or 2.
The positioning portion is a convex portion and
The second block member and the third block member have holes and have holes.
The convex portion is a battery module fitted in each of the holes. In the battery module according to any one of claims 1 to 4.
The lashing plate extends in a third direction orthogonal to the first direction and the second direction.
The positioning portion is a battery module formed at a position corresponding to a central portion of the second block member and the third block member in the third direction. A first battery group in which a plurality of battery cells are stacked in a first direction, a second battery group in which a plurality of battery cells are stacked in the first direction, the first battery group, and the first battery group. The first block member arranged between the two battery groups, the second block member sandwiching the first battery group together with the first block member, and the second block member together with the first block member. The third block member that sandwiches the battery group, the first battery group, the second battery group, the first block member, the second block member, and the third block member are fixed. A method for manufacturing a battery module including a lashing plate to be bound and a heat transfer sheet made of a member having a heat conductivity higher than that of air.
The lashing plate includes a second block member and a positioning portion for positioning the third block member, and one plate-shaped member from the second block member to the third block member. It is configured to be
The first battery group, the second battery group, the first block member, the second block member, and the third block member are arranged in a second direction orthogonal to the first direction. Place and
The second block member and the third block member are pressed in the direction of sandwiching the first battery group and the second battery group.
While maintaining the pressing, the lashing plate is fastened to the first block member, the second block member, and the third block member in a state of being positioned by the positioning portion.
The first battery group comes into contact with the first block member and the second block member via the heat transfer sheet.
The second battery group is a method for manufacturing a battery module in which a first block member and a third block member are brought into contact with each other via the heat transfer sheet. In the battery module according to any one of claims 1 to 5.
The lashing plate has the first battery group, the second battery group, the first block member, the second block member, and the third block member in both directions in the first direction. It has a pair of first lashing plates and a second lashing plate to tie from
At both ends of the second block member and the third block member in the first direction, the positioning portion and the fixing of the first lashing plate and the second lashing plate, respectively. A battery module provided with a block member side positioning portion and a block member side fixing portion corresponding to the portions.

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