JP2009231141A - Battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery module of a structure capable of improving efficiency of installation operations for attaching a current lead to a case, as well as reducing load to the current lead and a cell terminal. <P>SOLUTION: The battery module is provided with a case 20 containing a case main body 21 having a cell housing part housing a cell 10 and having a terminal hole with a cell terminal of the cell protruded, a nearly rectangular parallelepiped convex part 22 protruded from a wall plate with the terminal hole of the case main body formed, a current lead 40 electrically connected with the cell terminal protruded from the terminal hole and bending along a contour of the convex part, and a screw 60 fixing the current lead on the convex part. The current lead is provided with a plate-like connection part 41 electrically connected to the cell terminal and extended in nearly parallel with the wall plate, a plate-like middle part 42 connected to the connection part and extended along a side face of the convex part, and a plate-like extended part 43 connected to the middle part and extended along an upper face of the convex part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery module, and more particularly to a battery module in which a secondary battery (cell) using a non-aqueous electrolyte typified by a lithium ion battery or the like is accommodated in a case.

  In recent years, non-aqueous secondary batteries, in particular lithium ion secondary batteries, have high voltage and high energy density, and thus have attracted attention as power sources for cordless portable electronic devices and power sources for driving vehicles such as electric vehicles. ing.

In such a non-aqueous secondary battery, a current lead for taking out a current through a cell terminal, that is, a positive electrode terminal and a negative electrode terminal may be provided. For example, Patent Document 1 discloses a technique for connecting a terminal of a unit cell housed in a metal case and an external terminal provided in the metal case with leads. Moreover, the technique which connects the terminal of a single cell with a connection member is also disclosed. Patent Document 2 discloses a technique for storing a plurality of batteries and connecting the battery terminals of each battery with a connection line.
JP 2007-200758 A Japanese Patent No. 3350189

  There is a need to improve the efficiency of a series of mounting operations for electrically connecting the cell terminals of the cells and the current leads and fixing the current leads. For example, when the current lead is fixed by screwing, the current efficiency may be reduced due to the current lead moving or rotating. In addition, when fixing the current lead joined to the cell terminal by screwing, there is a risk that the current lead may be loaded and the current lead may be deformed, or the cell terminal may be loaded and the cell terminal may be damaged. .

  The present invention has been made in view of the above-described problems, and its object is to improve the efficiency of mounting work for mounting the current lead to the case, and to the current lead and the cell terminal. The object is to provide a battery module having a structure capable of reducing the load.

The battery module according to the first aspect of the present invention comprises:
An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A fixing member for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and is connected to the connection portion and extends along the side surface of the convex portion. It has a plate-shaped intermediate part, and the plate-shaped extension part connected to the said intermediate part and extended along the upper surface of the said convex part, It is characterized by the above-mentioned.

The battery module according to the second aspect of the present invention comprises:
An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A fixing member for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and extends along the first side surface of the convex portion connected to the connection portion. A plate-shaped intermediate portion that has been taken out, and a pair of plate-shaped clamping portions that are connected to the intermediate portion and extend along the second side surface and the third side surface adjacent to the first side surface of the convex portion, respectively. It is characterized by having.

The battery module according to the third aspect of the present invention is:
An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A screw for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and is connected to the connection portion and extends along the side surface of the convex portion. It has a plate-shaped intermediate part, and a cylindrical part connected to the intermediate part and press-fitted to the convex part and formed with a female screw for tightening the screw.

  According to the battery module of the present invention, the current lead is bent along the outer shape of the convex portion of the case, and is fitted to the convex portion. For this reason, when the current lead electrically connected to the cell terminal is fixed to the convex portion by the fixing member, the movement and rotation of the current lead are restricted. As a result, it is possible to improve the efficiency of current lead attachment work. In addition, it is possible to reduce the load on the current lead and the cell terminal when the current lead is attached.

  Hereinafter, a battery module according to an embodiment of the present invention will be described with reference to the drawings.

  First, the basic structure of the battery module will be described.

  As shown in FIG.1 and FIG.2, the battery module 1 is provided with the cell 10 and the case 20 formed so that the cell 10 could be accommodated.

  That is, the cell 10 is a secondary battery using a non-aqueous electrolyte typified by a lithium ion battery or the like, and has a structure in which an electrode group and a non-aqueous electrolyte are sealed and housed in an outer case. . The outer shape of the cell 10 (that is, the outer shape of the outer case) is generally a rectangular parallelepiped.

  The electrode group has, for example, a flat rectangular shape in which a positive electrode and a negative electrode are wound in a spiral shape with a separator interposed therebetween, and further compressed in the radial direction. A cell terminal is electrically connected to such an electrode group. That is, the positive electrode terminal 11 is electrically connected to the positive electrode of the electrode group, and the negative electrode terminal 12 is electrically connected to the negative electrode of the electrode group. Both the positive terminal 11 and the negative terminal 12 protrude outward from one surface (upper surface) 13 of the outer case.

  The case 20 includes a case main body 21 having a cell accommodating portion 21 </ b> X that accommodates the cell 10 and a convex portion 22 protruding from the case main body 21. Such a case 20 is made of, for example, a resin such as polycarbonate (PC) or polyphenylene sulfide (PPS), ceramic, or the like.

  The case body 21 is formed in a substantially rectangular parallelepiped shape and has six wall plates surrounding the cell 10. The cell housing portion 21 </ b> X corresponds to a substantially rectangular parallelepiped hollow portion formed inside the case main body 21, and is formed with a size larger than the outer shape of the cell 10. These six wall plates may be integrally formed, or at least one wall plate may be joined to another wall plate by screwing or a fitting structure. In one wall plate 21 </ b> A constituting the case body 21, two terminal holes 21 </ b> H that allow the positive electrode terminal 11 and the negative electrode terminal 12 of the cell 10 to be inserted are formed.

  When the cell 10 is accommodated in the cell accommodating portion 21 </ b> X of the case main body 21, a slight gap through which a cooling medium (for example, cold air) can pass is formed between the cell 10 and the case main body 21. Further, the positive terminal 11 and the negative terminal 12 inserted into the terminal hole 21H protrude outward from the wall plate 21A, respectively, and can be connected to current leads.

  The convex portion 22 is formed so as to project outward from the wall plate 21A (that is, the side opposite to the cell housing portion 21X). In this embodiment, the convex portion 22 is formed in a substantially rectangular parallelepiped shape, and has four side surfaces 22A to 22D and an upper surface 22E that rise outward from the wall plate 21A. These four side surfaces 22A to 22D and the upper surface 22E are formed in a substantially rectangular shape. In addition, the shape of the convex part 22 is not limited to the example shown here, Other shapes may be sufficient.

  The side surface 22A extends in a direction substantially perpendicular to the wall plate 21A from which the positive electrode terminal 11 protrudes. The side surface 22B faces the side surface 22A and extends in a direction substantially perpendicular to the wall plate 21A from which the negative electrode terminal 12 protrudes. The side surface 22C and the side surface 22D face each other and are adjacent to the side surface 22A and the side surface 22B. The upper surface 22E is connected to the four side surfaces 22A to 22D.

  The convex portion 22 includes an insert 30. The insert 30 extends from each of the side surface 22A and the side surface 22B toward the inside of the convex portion 22, and a female screw is formed on the inner surface. Such an insert 30 is formed of a metal such as brass, for example.

  Such a battery module 1 further includes a current lead electrically connected to the cell terminal 11 or 12 protruding from the terminal hole 21H of the case 20. That is, the current lead is fixed to the cell terminal 11 or 12 at the same time as being electrically connected by a technique such as welding, and is fixed to the convex portion 22 by a screw as a fixing member. The screw is fastened to the insert 30 with the current lead interposed therebetween.

  Regarding the mounting of such a current lead to the case 20, an embodiment of a specific structure of the current lead and the case will be described in detail.

<< First Embodiment >>
In the first embodiment, as illustrated in FIGS. 3 to 5, the current lead 40 is bent along the outer shape of the convex portion 22. That is, the current lead 40 is formed of a conductive material, and can be formed, for example, by bending a single plate-shaped conductive material. In the first embodiment, the current lead 40 integrally has a connection portion 41, an intermediate portion 42, and an extension portion 43, and is formed in a substantially Z-shape.

  More specifically, the connection portion 41 is formed in a substantially rectangular plate shape, and extends substantially parallel to the wall plate 21 </ b> A of the case body 21. The connection portion 41 has an opening 41H into which a cell terminal protruding from the wall plate 21A can be inserted. The connection portion 41 is electrically connected to the cell terminal inserted into the opening 41H by welding or the like. In the example shown in FIG. 4, only the current lead 40 connected to the negative terminal 12 is shown, but the current lead 40 is connected to the positive terminal 11 as a matter of course.

  One end of the intermediate part 42 is connected to one end of the connection part 41. The intermediate portion 42 is formed in a substantially rectangular plate shape, and extends along the side surface 22 </ b> A of the convex portion 22. The intermediate portion 42 extends in a direction substantially perpendicular to the connection portion 41 in correspondence with the side surface 22A extending in a direction substantially perpendicular to the wall plate 21A. Further, the intermediate portion 42 has an opening 42H into which the insert 30 protruding from the side surface 22A can be inserted.

  One end of the extending portion 43 is connected to the other end of the intermediate portion 42. The extending portion 43 is formed in a substantially rectangular plate shape, and extends along the upper surface 22 </ b> E of the convex portion 22. The extending portion 43 extends in a direction substantially perpendicular to the intermediate portion 42 in correspondence with the upper surface 22E extending in a direction substantially perpendicular to the side surface 22A.

  The connecting portion 41 has a voltage extraction terminal 50 extending in a direction substantially perpendicular to the connecting portion 41 at the other end, but it is not always necessary.

  On the other hand, for the case 20, the convex portion 22 has a pair of protrusions CV sandwiching the extended portion 43 of the current lead 40 on the upper surface 22 </ b> E. The pair of protrusions CV are arranged at an interval equivalent to the width W1 of the extending portion 43. For this reason, the extension part 43 is fitted and held between the protrusions CV.

  In the first embodiment having such a configuration, when the screw (fixing member) 60 is fastened to the insert 30 via the spring washer 61 and the flat washer 62, the current lead 40 has an intermediate portion 42 on the side surface 22A of the convex portion 22. Therefore, the movement of the current lead 40 in the tightening direction of the screw 60 is restricted. Further, since the current lead 40 is held by the pair of protrusions CV, the movement of the current lead 40 in the direction parallel to the width W1 is restricted. At the same time, the rotation of the current lead 40 in the rotation direction of the screw 60 is also restricted.

  Therefore, it is possible to improve the efficiency of attachment work for attaching the current lead 40 to the case. Further, it is possible to reduce the load on the current lead 40 and the cell terminal joined to the current lead 40, and it is possible to prevent the current lead 40 from being deformed and the cell terminal from being damaged.

  Moreover, in this 1st Embodiment, about the case 20, the case main body 21 has the bag-shaped fitting part BC with which the connection part 41 fits. The fitting portion BC is formed so as to protrude from the wall plate 21 </ b> A, and has a gap larger than the thickness D of the connection portion 41 on the side facing the convex portion 22. For this reason, the other end of the connecting portion 41 is fitted and held in the gap of the fitting portion BC. Note that the voltage extraction terminal 50 provided at the other end of the connection portion 41 extends without being fitted into the fitting portion BC.

  According to such a configuration, since the movement of the current lead 40 is further restricted, the working efficiency is further improved, and the load on the current lead 40 and the cell terminal can be reduced.

<< First embodiment; modification >>
In the above-described first embodiment, the case where the convex portion 22 has a pair of protrusions CV on the upper surface 22E has been described. However, as shown in FIGS. In this case, the convex portion 22 may have a concave portion CC in which the extended portion 43 of the current lead 40 is fitted on the upper surface 22E. The concave portion CC is formed to have a width equivalent to the width W1 of the extending portion 43. For this reason, the extension part 43 is fitted and held in the recessed part CC.

  Also in such a modification, the same effect as the first embodiment described above can be obtained.

<< Second Embodiment >>
In the second embodiment, as shown in FIGS. 8 to 9, the current lead 40 is bent along the outer shape of the convex portion 22. That is, the current lead 40 is formed of a conductive material, and can be formed, for example, by bending a single plate-shaped conductive material. In the second embodiment, the current lead 40 integrally includes a connection part 41, an intermediate part 42, and a pair of clamping parts 44. The intermediate part 42 and the pair of clamping parts 44 are formed in a substantially U shape.

  More specifically, the connection portion 41 is formed in a substantially rectangular plate shape, and extends substantially parallel to the wall plate 21 </ b> A of the case body 21. The connection portion 41 has an opening 41H into which a cell terminal protruding from the wall plate 21A can be inserted. The connection portion 41 is electrically connected to the cell terminal inserted into the opening 41H by welding or the like. In the example shown in FIG. 9, only the current lead 40 connected to the negative terminal 12 is shown, but the current lead 40 is connected to the positive terminal 11 as a matter of course.

  One end of the intermediate part 42 is connected to one end of the connection part 41. The intermediate portion 42 is formed in a substantially rectangular plate shape, and extends along the side surface 22 </ b> A of the convex portion 22. The intermediate portion 42 extends in a direction substantially perpendicular to the connection portion 41 in correspondence with the side surface 22A extending in a direction substantially perpendicular to the wall plate 21A. Further, the intermediate portion 42 has an opening 42H into which the insert 30 protruding from the side surface 22A can be inserted.

  The clamping unit 44 includes a first clamping unit 44 </ b> A and a second clamping unit 44 </ b> B, and each is connected to a side end of the intermediate unit 42. The first sandwiching portion 44A and the second sandwiching portion 44B are formed in a substantially rectangular plate shape and are opposed to each other with an interval equal to the width W2 of the convex portion 22. That is, the first sandwiching portion 44A extends along the side surface 22C of the convex portion 22, and the second sandwiching portion 44B extends along the side surface 22D of the convex portion 22, and the first sandwiching portion 44A and the second sandwiching portion 44A. The sandwiching portion 44B sandwiches the convex portion 22.

  The first sandwiching portion 44A and the second sandwiching portion 44B are substantially perpendicular to the intermediate portion 42, corresponding to the side surface 22C and the side surface 22D extending in a direction substantially perpendicular to the side surface 22A. It extends in the direction. That is, the first sandwiching portion 44A and the second sandwiching portion 44B face each other substantially in parallel.

  The connecting portion 41 has a voltage extraction terminal 50 extending in a direction substantially perpendicular to the connecting portion 41 at the other end, but it is not always necessary.

  In the second embodiment having such a configuration, when the screw 60 is fastened to the insert 30 via the spring washer 61 and the flat washer 62, the intermediate portion 42 of the current lead 40 is pressed against the side surface 22A of the convex portion 22. The movement of the current lead 40 in the tightening direction of the screw 60 is restricted. Further, since the current lead 40 sandwiches the convex portion 22 by the pair of sandwiching portions 44, the movement of the convex portion 22 in the direction parallel to the width W2 is restricted. At the same time, the rotation of the current lead 40 in the rotation direction of the screw 60 is also restricted.

  Therefore, it is possible to improve the efficiency of attachment work for attaching the current lead 40 to the case. Further, it is possible to reduce the load on the current lead 40 and the cell terminal joined to the current lead 40, and it is possible to prevent the current lead 40 from being deformed and the cell terminal from being damaged.

  Moreover, in this 2nd Embodiment, about the case 20, the case main body 21 has the bag-shaped fitting part BC with which the connection part 41 fits. The fitting portion BC is formed so as to protrude from the wall plate 21 </ b> A, and has a gap larger than the thickness D of the connection portion 41 on the side facing the convex portion 22. For this reason, the other end of the connecting portion 41 is fitted and held in the gap of the fitting portion BC. Note that the voltage extraction terminal 50 provided at the other end of the connection portion 41 extends without being fitted into the fitting portion BC.

  According to such a configuration, since the movement of the current lead 40 is further restricted, the working efficiency is further improved, and the load on the current lead 40 and the cell terminal can be reduced.

«Second embodiment; modification»
In the second embodiment described above, the case where the pair of sandwiching portions 44 in the current lead 40 sandwich the convex portion 22 has been described. However, as illustrated in FIG. 10, the convex portion 22 has a side surface 22C and a side surface 22D, respectively. You may have the recessed part CC with which the clamping part 44 fits.

  In such a modified example, since the sandwiching portion 44 displays the convex portion 22 and at the same time the sandwiching portion 44 fits into the concave portion CC formed on the side surface of the convex portion 22, the sandwiching portion 44 is further more than the second embodiment described above. The movement of the current lead 40 can be limited.

<< Third Embodiment >>
In the third embodiment, as shown in FIGS. 11 to 14, the current lead 40 is bent along the outer shape of the convex portion 22. That is, the current lead 40 is made of a conductive material. In the third embodiment, the current lead 40 integrally includes a connection part 41, an intermediate part 42, and a cylindrical part 45. The connection part 41 and the intermediate part 42 can be formed by, for example, bending a single plate-like conductive material, and are formed in a substantially L shape. The cylindrical part 45 is joined to the intermediate part 42 by welding or the like.

  More specifically, the connection portion 41 is formed in a substantially rectangular plate shape, and extends substantially parallel to the wall plate 21 </ b> A of the case body 21. The connection portion 41 has an opening 41H into which a cell terminal protruding from the wall plate 21A can be inserted. The connection portion 41 is electrically connected to the cell terminal inserted into the opening 41H by welding or the like. In the example shown in FIG. 13, only the current lead 40 connected to the negative terminal 12 is shown, but the current lead 40 is connected to the positive terminal 11 as a matter of course.

  One end of the intermediate part 42 is connected to one end of the connection part 41. The intermediate portion 42 is formed in a substantially rectangular plate shape, and extends along the side surface 22 </ b> A of the convex portion 22. The intermediate portion 42 extends in a direction substantially perpendicular to the connection portion 41 in correspondence with the side surface 22A extending in a direction substantially perpendicular to the wall plate 21A. The intermediate part 42 has an opening 42H into which the screw 60 can be inserted.

  The cylindrical portion 45 is connected to the intermediate portion 42 so as to communicate with the opening 42H. A female screw for tightening the screw 60 is formed on the inner surface of the cylindrical portion 45. Such a cylindrical portion 45 is press-fitted into the convex portion 22 instead of the insert 30 described above. Thereby, the current lead 40 is fixed to the convex portion 22.

  The connecting portion 41 has a voltage extraction terminal 50 extending in a direction substantially perpendicular to the connecting portion 41 at the other end, but it is not always necessary.

  In the third embodiment having such a configuration, when the screw 60 is fastened to the cylindrical portion 45 of the current lead 40 via the spring washer 61 and the flat washer 62, the current lead 40 is fixed to the convex portion 22. The movement of the current lead 40 in the tightening direction of the screw 60 is restricted, and the movement of the protrusion 22 in the direction parallel to the width W2 is restricted, and at the same time, the rotation of the screw 60 in the rotating direction is also restricted. .

  Therefore, it is possible to improve the efficiency of attachment work for attaching the current lead 40 to the case. Further, it is possible to reduce the load on the current lead 40 and the cell terminal joined to the current lead 40, and it is possible to prevent the current lead 40 from being deformed and the cell terminal from being damaged. Furthermore, no insert is required, and the number of parts can be reduced.

  Moreover, in this 3rd Embodiment, about the case 20, the case main body 21 has the bag-shaped fitting part BC with which the connection part 41 fits. The fitting portion BC is formed so as to protrude from the wall plate 21 </ b> A, and has a gap larger than the thickness D of the connection portion 41 on the side facing the convex portion 22. For this reason, the other end of the connecting portion 41 is fitted and held in the gap of the fitting portion BC. Note that the voltage extraction terminal 50 provided at the other end of the connection portion 41 extends without being fitted into the fitting portion BC.

  According to such a configuration, since the movement of the current lead 40 is further restricted, the working efficiency is further improved, and the load on the current lead 40 and the cell terminal can be reduced.

  In addition, this invention is not limited to the said embodiment itself, In the stage of implementation, it can change and implement a component within the range which does not deviate from the summary. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

FIG. 1 is a cross-sectional view schematically showing a basic structure of a battery module according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing a basic structure of the battery module shown in FIG. FIG. 3 is a perspective view schematically showing a structure of a current lead applied to the battery module according to the first embodiment. FIG. 4 is a perspective view schematically showing a part of the external appearance of the battery module to which the current lead shown in FIG. 3 is applied. FIG. 5 is a sectional view schematically showing a state where the current lead shown in FIG. 3 is attached to the case. FIG. 6 is a perspective view schematically showing a part of the appearance of a battery module according to a modification of the first embodiment. FIG. 7 is a cross-sectional view schematically showing a state where a current lead is attached to a case in a battery module according to a modification. FIG. 8 is a perspective view schematically showing a structure of a current lead applied to the battery module according to the second embodiment. FIG. 9 is a perspective view schematically showing a part of the external appearance of the battery module to which the current lead shown in FIG. 8 is applied. FIG. 10 is a perspective view schematically showing a part of the appearance of a battery module according to a modification of the second embodiment. FIG. 11 is a perspective view schematically showing a structure of a current lead applied to the battery module according to the third embodiment. FIG. 12 is a perspective view schematically showing a structure of a current lead applied to the battery module according to the third embodiment. FIG. 13 is a perspective view schematically showing a part of the appearance of the battery module to which the current lead shown in FIG. 11 is applied. FIG. 14 is a cross-sectional view schematically showing a state in which the current lead shown in FIG. 11 is attached to the case.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Battery module 10 ... Cell 11 ... Positive electrode terminal 12 ... Negative electrode terminal 20 ... Case 21 ... Case main body 21X ... Cell accommodating part 21A ... Wall board 21H ... Terminal hole 22 ... Convex part 22A thru | or D ... Side surface 22E ... Upper surface CV ... Projection BC ... fitting part CC ... recessed part 30 ... insert 40 ... current lead 41 ... connection part 42 ... intermediate part 43 ... extension part 44 ... clamping part 45 ... cylindrical part 50 ... voltage extraction terminal 60 ... screw

Claims (6)

An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A fixing member for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and is connected to the connection portion and extends along the side surface of the convex portion. A battery module comprising: a plate-like intermediate portion; and a plate-like extension portion connected to the intermediate portion and extending along an upper surface of the convex portion.   The battery module according to claim 1, wherein the convex portion has a pair of protrusions sandwiching the extending portion or a concave portion into which the extending portion is fitted on the upper surface thereof. An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A fixing member for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and extends along the first side surface of the convex portion connected to the connection portion. A plate-shaped intermediate portion that has been taken out, and a pair of plate-shaped clamping portions that are connected to the intermediate portion and extend along the second side surface and the third side surface adjacent to the first side surface of the convex portion, respectively. A battery module comprising:   4. The battery module according to claim 3, wherein the convex portion has a concave portion into which the clamping portion is fitted in each of the second side surface and the third side surface thereof. An electrode group and a nonaqueous electrolyte solution are housed in an outer case, and are configured to be electrically connected to the electrode group and having a cell terminal protruding from the outer case,
A case main body having a cell accommodating portion for accommodating the cell and having a terminal hole from which a cell terminal of the cell projects; and a substantially rectangular parallelepiped convex portion projecting from a wall plate in which the terminal hole of the case main body is formed; A case having
A current lead that is electrically connected to the cell terminal protruding from the terminal hole and bent along the outer shape of the convex portion;
A screw for fixing the current lead to the convex part,
The current lead is electrically connected to the cell terminal and extends substantially parallel to the wall plate, and is connected to the connection portion and extends along the side surface of the convex portion. A battery module comprising: a plate-like intermediate portion; and a cylindrical portion that is connected to the intermediate portion and press-fitted into the convex portion, and is formed with a female screw for tightening the screw.   6. The battery module according to claim 1, wherein the case body has a bag-like fitting portion into which the connection portion is fitted.

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