JP6390722B2 - Battery pack - Google Patents

Description

  One aspect of the present invention relates to a battery pack.

  Patent Document 1 describes an assembled battery (battery module) formed by integrally stacking a plurality of prismatic battery cells. In this assembled battery, a metal restraint plate is abutted against a prismatic battery cell located at an end of the stacked prismatic battery cells. The pair of restraining plates are connected to each other by a long connecting member so that the square battery cell is pressed.

JP 2001-236937 A

  When fixing the above-described battery module to the battery pack casing, for example, predetermined fixing members are installed at both ends of the battery module in the stacking direction of the battery cells, and the battery module is attached to the casing at both ends of the battery module. It is assumed to be fixed. In that case, when vibration or impact is applied to the battery module, the central part of the battery module in the stacking direction of the battery cells bends in a direction intersecting the stacking direction, or each of the battery cells crosses the stacking direction. There is a risk of tilting with respect to the direction.

  One aspect of the present invention has been made in view of such circumstances, and an object thereof is to provide a battery pack capable of suppressing deformation of a battery module in a direction intersecting with a stacking direction of battery cells.

  In order to solve the above problems, a battery pack according to an aspect of the present invention includes a battery module, a housing that houses the battery module, and a fixing member that fixes the battery module to a mounting surface of the housing. The battery module includes a stacked body including a plurality of battery cells stacked in a first direction along the mounting surface, a plurality of cell holders for individually holding each of the battery cells, and along the first direction. A plurality of battery cells, and a plurality of battery cells disposed between both ends of the stacked body in the first direction, and a plurality of battery cells disposed between the outer cells. An inner cell, and the plurality of cell holders include a pair of outer holders holding each of the outer cells, and a plurality of inner holders holding each of the inner cells, and the fixing member includes the plurality of inner holders. Our little Securing the battery module to the mounting surface via the Kutomo one inner holder.

  In this battery pack, the plurality of battery cells constituting the battery module stack includes a plurality of inner cells between a pair of outer cells located at both ends of the stack. The plurality of cell holders include a plurality of inner holders that hold the inner cells. The fixing member fixes the battery module to the mounting surface via at least one of the inner holders. Thus, in this battery pack, when the battery module is fixed to the mounting surface of the housing, at least the inner part of the battery module is fixed by the fixing member. For this reason, according to this battery pack, the center part of the battery module in the stacking direction (first direction) of the battery cells bends in a direction crossing the stacking direction, or each of the battery cells crosses the stacking direction. Inclination with respect to the direction is suppressed. Therefore, according to this battery pack, it is possible to suppress deformation of the battery module in a direction intersecting with the stacking direction of the battery cells.

  In the battery pack according to one aspect of the present invention, the fixing member may fix the battery module to the mounting surface via two or more inner holders. As described above, when a plurality of inner holders are used for fixing the battery module, the battery module can be fixed to the mounting surface of the housing while reliably suppressing the deformation of the battery module as described above.

  In the battery pack according to one aspect of the present invention, the inner holder used for fixing the battery module intersects the first side wall portion extending in the second direction intersecting the mounting surface and the first and second directions. And a first fixing portion protruding from the first side wall portion in the third direction, and the first fixing portion is provided with a first through hole penetrating in the second direction. The fixing member may fix the battery module to the mounting surface by inserting the fastening member through the first through hole. By using such an inner holder, the battery module can be fixed to the mounting surface of the housing while suppressing the deformation of the battery module easily and reliably.

  In the battery pack according to one aspect of the present invention, the battery cell includes a facing surface facing the mounting surface and a facing surface opposite to the facing surface, and the terminals of the battery cell are provided on the facing surface. The first side wall includes first and second portions arranged along the second direction, and the first fixing portion extends from the opposing surface to the opposite surface along the second direction. May be provided in the first and second portions. In this case, it is possible to sufficiently secure the fixing strength of the battery module.

  In the battery pack according to one aspect of the present invention, the first side wall portion includes first and second portions arranged in the second direction, and the first fixing portion includes the first and second portions. It may be provided in one of the two parts. In this case, the material for the cell holder can be reduced. Further, by arranging the first fixing part of the cell holder of one battery module so as to overlap the first fixing part of the cell holder of another battery module, the respective battery modules are collectively enclosed by a common fixing member. It can be fixed to the body.

  In the battery pack according to one aspect of the present invention, the first through hole may be a long hole extending along the first direction. In this case, for example, when a force is applied to each battery cell along the first direction due to expansion of the battery cell, for example, in a state where the fastening member is inserted into the through hole of the fixed holder and the battery module is fixed to the housing. In addition, the displacement of each battery cell and each cell holder can be allowed by the extension length of the first through hole. For this reason, breakage of the fixing member can be suppressed.

  In the battery pack according to one aspect of the present invention, the fixing member may further fix the battery module to the mounting surface via the outer holder. In this case, the battery module is more firmly fixed.

  In the battery pack according to one aspect of the present invention, the outer holder used for fixing the battery module intersects the second side wall portion extending in the second direction intersecting the attachment surface and the first and second directions. And a second fixing portion protruding from the second side wall portion in the third direction, and the second fixing portion is provided with a second through hole penetrating in the second direction. The fixing member may further fix the battery module to the mounting surface by inserting the fastening member through the second through hole. In this case, it is not necessary to prepare another fixing member when the battery module is firmly fixed to the housing. Moreover, the dimension of a 1st direction is reduced compared with the case where another fixing member is arrange | positioned so that a battery module may be pinched | interposed from the both sides of a 1st direction.

  In the battery pack according to one aspect of the present invention, the restraining member includes a pair of end plates disposed at both ends of the laminate in the first direction, and the restraint load is applied to the battery cells by fastening the end plates together. The fixing member may further fix the battery module to the mounting surface via the end plate. In this case, the battery pack is more firmly fixed. Moreover, it is possible to reduce the number of parts by using an end plate for applying a restraining load to the battery cell to fix the battery module.

  In the battery pack according to one aspect of the present invention, the battery module may include an elastic member that is restrained by the restraining member along with the battery cells along the first direction. In this case, the displacement of the battery cell along the first direction is reliably permitted by the cooperation of the elastic member and the first through hole which is a long hole. As a result, the fixing member can be reliably prevented from being damaged.

  According to one aspect of the present invention, it is possible to provide a battery pack that can suppress deformation of the battery module in a direction that intersects the stacking direction of the battery cells.

It is a typical side view of the battery pack which concerns on this embodiment. It is a perspective view which shows the battery cell and cell holder which were shown by FIG. It is typical sectional drawing of the battery cell and cell holder which were shown by FIG. It is a typical side view for demonstrating the effect of the battery module shown by FIG. It is typical sectional drawing which shows the modification of the cell holder shown by FIG. It is typical sectional drawing for demonstrating the effect by using the extending part shown by FIG. It is a typical side view which shows the modification of the battery pack shown by FIG. It is a typical side view which shows the modification of the battery pack shown by FIG. It is a side view which shows the modification of the battery module shown by FIG.

  Hereinafter, a battery pack according to an aspect of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements or corresponding elements may be denoted by the same reference numerals, and overlapping descriptions may be omitted. In the following drawings, an orthogonal coordinate system S is shown for easy understanding.

  FIG. 1 is a schematic side view of the battery pack according to the present embodiment. FIG. 2 is a perspective view showing the battery cell and the cell holder shown in FIG. FIG. 3 is a schematic cross-sectional view of the battery cell and the cell holder shown in FIG. As shown in FIGS. 1 to 3, the battery pack 100 includes a plurality of battery modules 1, for example. Here, one battery module 1 is illustrated. The battery pack 100 further includes a housing 2 that houses the battery module 1, and a fixing member 3 that fixes the battery module 1 to the mounting surface 2 s of the housing 2. The housing 2 has, for example, a box shape, and the mounting surface 2s is the inner surface of the box-shaped housing 2.

  The battery module 1 includes a stacked body 20 including a plurality of (here, nine) battery cells 10 stacked along a first direction (X-axis direction of the orthogonal coordinate system S), and each of the battery cells 10 individually. A plurality of (in this case, nine) cell holders 30 and a restraining member 40 that applies a restraining load to the battery cells 10 along the stacking direction of the battery cells 10.

  The battery cell 10 is a nonaqueous electrolyte secondary battery such as a lithium-in secondary battery. The battery cell 10 is electrically connected to an electrode assembly (not shown), a case 11 that accommodates the electrode assembly, and electrodes (each of a positive electrode and a negative electrode) of the electrode assembly and protrudes from the case 11. And a terminal 12. The electrode assembly includes a plurality of positive and negative electrodes, and a separator disposed between the positive and negative electrodes. The positive electrode and the negative electrode are alternately stacked via separators. The stacking direction of the positive electrode and the negative electrode in the electrode assembly matches the stacking direction of the battery cells 10 in the stacked body 20.

  The case 11 has a rectangular parallelepiped shape. The case 11 includes a pair of side surfaces 11a and 11b facing each other, a pair of side surfaces 11c and 11d facing each other, and an upper surface 11e and a bottom surface 11f facing each other. The side surfaces 11a and 11b are surfaces intersecting the electrode stacking direction in the electrode assembly. The side surfaces 11c and 11d are surfaces along the electrode stacking direction in the electrode assembly, and are surfaces that connect the side surface 11a and the side surface 11b. The terminal 12 is provided on the upper surface 11e so as to protrude from the upper surface 11e. Here, as an example, the bottom surface 11 f is a facing surface that faces the mounting surface 2 s when the battery module 1 is fixed to the housing 2. As an example, the upper surface 11e is an opposite surface opposite to the opposite surface.

  The plurality of battery cells 10 includes a pair of outer cells 10A located at one end 20a and the other end 20b (that is, both ends) of the stacked body 20 in the first direction (stacking direction of the battery cells 10), and a pair of outer cells 10A. And a plurality (seven in this case) of inner cells 10B disposed therebetween. In other words, the plurality of battery cells 10 are divided into an outer cell 10A and an inner cell 10B. However, here, as an example, the battery cells 10 belonging to either the outer cell 10A or the inner cell 10B have the same configuration.

  Similarly, a plurality of cell holders 30 are arranged between a pair of outer holders 30A located at one end 20a and the other end 20b of the stacked body 20 in the first direction, and a plurality (here, seven). One) inner holder 30B. In other words, the plurality of cell holders 30 are divided into an outer holder 30A and an inner holder 30B. The outer holder 30A holds the outer cell 10A among the plurality of battery cells 10, and the inner holder 30B holds the inner cell 10B. Here, as an example, the cell holders 30 belonging to either the outer holder 30A or the inner holder 30B have the same configuration. That is, here, both the outer holder 30A and the inner holder 30B can be used for fixing the battery module 1 as described later.

  The cell holder 30 includes sidewall portions (first sidewall portion, second sidewall portion) 30c and sidewall portions 30d facing each other, and an upper wall portion 30e and bottom wall portion 30f facing each other. In the cell holder 30, a rectangular parallelepiped space portion into which the battery cell 10 is fitted is defined by the side wall portions 30 c and 30 d, the upper wall portion 30 e, and the bottom wall portion 30 f. The side wall portions 30c and 30d are disposed on the side surfaces 11c and 11d of the case 11, respectively. The upper wall portion 30e and the bottom wall portion 30f are disposed on the upper surface 11e and the bottom surface 11f of the case 11, respectively.

  The upper wall portion 30e and the bottom wall portion 30f are provided with through holes 30h through which bolts 43 of a restraining member 40 described later are inserted. The side wall portions 30c and 30d have a long plate shape extending in a second direction (the Z-axis direction of the orthogonal coordinate system S) intersecting the mounting surface 2s. Further, the cell holder 30 includes a fixed portion (first fixed portion, projecting outward from the side wall portion 30c in a third direction (Y-axis direction of the orthogonal coordinate system S) intersecting the first and second directions. 2nd fixing | fixed part) 31 and another fixing | fixed part 32 which protruded outward from the side wall part 30d in the 3rd direction. Here, the fixing portions 31 and 32 have a long rectangular parallelepiped shape extending in the second direction. The fixing portions 31 and 32 are provided with through holes (first through holes and second through holes) 33 that penetrate in the second direction. The through-hole 33 is a long hole extending along the first direction when viewed from the second direction.

  Here, the side wall portions 30c and 30d include a first portion P1 and a second portion P2 arranged along the second direction (see particularly FIG. 3). The fixing portions 31 and 32 are provided on both the first portion P1 and the second portion P2 so as to extend from the bottom surface 11f (opposing surface) to the upper surface 11e (opposite surface) along the second direction. . In other words, in the second direction, the fixing portion 31 is provided over the entire side wall portion 30c, and the fixing portion 32 is provided over the entire side wall portion 30d. In other words, the fixing portions 31 and 32 are provided across the terminal 12 from the bottom surface 11f along the second direction.

  The restraining member 40 includes a pair of end plates 41 disposed at one end 20a and the other end 20b of the stacked body 20 in the first direction, and a fastening member 42 that fastens the end plates 41 to each other. The restraint member 40 applies a restraint load to the battery cell 10 along the first direction by fastening the end plates 41 to each other using the fastening member 42.

  The fastening member 42 includes, for example, a long bolt 43 and a nut 44 that is screwed to the bolt 43. The bolt 43 is inserted into the end plate 41 at the outer edge portion of the end plate 41, for example, and is inserted into the through hole 30h of the cell holder 30 described above. Then, the nuts 44 are screwed into both ends of each bolt 43 from the outside of the end plate 41, whereby the battery cell 10 and the cell holder 30 are sandwiched and unitized, and a restraining load is applied to the battery cell 10. Is added. Thereby, the battery module 1 is comprised.

  As shown in FIG. 1, the battery module 1 configured as described above is fixed to the mounting surface 2 s of the housing 2 by a fixing member 3. Specifically, the fixing member 3 includes a fastening member 50A. The fastening member 50A is, for example, a long bolt. The fastening member 50A is inserted through the through holes 33 of the fixing portions 31 and 32 of the pair of outer holders 30A. That is, the fastening members 50 </ b> A are arranged at the four corners of the battery module 1 when viewed from the second direction. Then, the fastening member 50A inserted through the through hole 33 is screwed into a screw hole provided in the mounting surface 2s of the housing 2, so that the battery module 1 is attached to the housing 2 via the outer holder 30A. It is fixed to the surface 2s.

  Thereby, the battery module 1 is fixed to the attachment surface 2 s of the housing 2 at one end 20 a and the other end 20 b (that is, both ends) of the stacked body 20. That is, here, among the plurality of cell holders 30, the pair of outer holders 30 </ b> A is the outer holder 30 </ b> A used for fixing the battery module 1. The fixing member 3 fixes the battery module 1 to the mounting surface 2s of the housing 2 via the outer holder 30A.

Here, in the battery module 1, the fixing member 3 includes a fastening member 50B. The fastening member 50B is, for example, a long bolt. The fastening member 50B is inserted through the through holes 33 of the fixing portions 31 and 32 of the inner holder 30B located at the center of the battery module 1 (stacked body 20) in the first direction, for example. Then, the fastening member 50B inserted through the through hole 33 is screwed into a screw hole provided in the mounting surface 2s of the housing 2, whereby the battery module 1 is further attached to the housing 2 via the inner holder 30B. It is fixed to the surface 2s.

  That is, here, among the plurality of cell holders 30, one inner holder 30 </ b> B located at the center of the battery module 1 in the first direction is the inner holder 30 </ b> B used for fixing the battery module 1. And the fixing member 3 fixes the battery module 1 to the attachment surface 2s of the housing | casing 2 via the inner holder 30B. As described above, the battery module 1 is fixed to the housing 2 not only at both ends in the first direction but also at the inner portion thereof. For this reason, fixation to the housing | casing 2 of the battery module 1 is reinforced. That is, the inner holder 30B and the fastening member 50B function as a reinforcing member for reinforcing the fixation of the battery module 1 to the housing 2 in the inner portion (here, the central portion) of the battery module 1 in the first direction. To do.

  As described above, in the battery pack 100 according to the present embodiment, the plurality of battery cells 10 constituting the stacked body 20 of the battery module 1 are the plurality of inner cells 10B arranged between the pair of outer cells 10A. including. The plurality of cell holders 30 include a plurality of inner holders 30B that hold the inner cells 10B. And the fixing member 3 fixes the battery module 1 to the attachment surface 2s via one of the inner holders 30B.

  Thus, in the battery pack 100, at least the inner part of the battery module 1 is fixed by the fixing member 3 when the battery module 1 is fixed to the mounting surface 2 s of the housing 2. Therefore, according to the battery pack 100, the center part of the battery module 1 in the first direction is bent in the second and third directions, or each of the battery cells 10 is inclined with respect to the second direction. It is suppressed. Therefore, according to this battery pack 100, it is possible to suppress the deformation of the battery module 1 in the direction intersecting the first direction.

  In the battery pack 100 according to the present embodiment, the inner holder 30B includes side wall portions 30c and 30d extending in the second direction, and a fixing portion 31 protruding from the side wall portions 30c and 30d in the third direction. 32. In addition, the fixing portions 31 and 32 are provided with a through hole 33 penetrating in the second direction. And the fixing member 3 fixes the battery module 1 to the attachment surface 2s by inserting the fastening member 50B through the through hole 33 of the inner holder 30B. By using such an inner holder 30B, the battery module 1 can be fixed to the mounting surface 2s of the housing 2 while suppressing the deformation of the battery module 1 easily and reliably.

  In the battery pack 100 according to the present embodiment, the fixing member 3 further fixes the battery module 1 to the mounting surface 2s via the outer holder 30A. For this reason, the battery module 1 is more firmly fixed. In particular, the outer holder 30A also includes side wall portions (30c, 30d) extending in the second direction and fixing portions 31, 32 projecting from the side wall portions 30c, 30d in the third direction. The portions 31 and 32 are provided with through holes 33 that penetrate in the second direction.

  The fixing member 3 further fixes the battery module 1 to the mounting surface 2s by inserting the fastening member 50A through the through hole 33 of the outer holder 30A. For this reason, when fixing the battery module 1 to the housing | casing 2 firmly, it is not necessary to prepare another fixing member. Moreover, the dimension of a 1st direction is reduced compared with the case where another fixing member is arrange | positioned so that the battery module 1 may be pinched | interposed from the both sides of a 1st direction.

  Further, in the battery pack 100 according to the present embodiment, the side wall portions 30c, 30d of the cell holder 30 (the outer holder 30A and the inner holder 30B) have the first portion P1 and the second portion arranged in the second direction. Part P2. And the fixing | fixed part 31 and 32 is provided in the 1st part P1 and the 2nd part P2 so that the upper surface 11e may be exceeded from the bottom face 11f along a 2nd direction. That is, the fixing portions 31 and 32 are provided over the entire side wall portions 30c and 30d in the second direction. For this reason, the axial force of the fastening members 50 </ b> A and 50 </ b> B can be applied over the entire side wall portions 30 c and 30 d, and the fixing strength of the battery module 1 via the cell holder 30 can be sufficiently secured.

In addition, since the fixing portions 31 and 32 of the cell holder 30 are provided over the entire side wall portions 30c and 30d in the second direction, the following effects can be achieved. That is, as shown in FIG. 4, when a plurality (two in this case) of battery modules 1 are stacked (stacked) in the second direction, the common fastening members 50A and 50B have sufficient strength. Each battery module 1 can be fixed to the mounting surface 2 s of the housing 2. In addition, when using common fastening member 50A, 50B with respect to the some battery module 1 in this way, the plate member 60 is arrange | positioned between the battery modules 1 so that fastening member 50A, 50B may mutually be connected. be able to.

  Furthermore, in the battery module 1 according to the present embodiment, the through hole 33 of the cell holder 30 (the outer holder 30A and the inner holder 30B) is a long hole extending along the first direction when viewed from the second direction. is there. For this reason, in a state where the fastening members 50A and 50B are inserted into the through holes 33 of the cell holder 30 and the battery module 1 is fixed to the housing 2, for example, each battery along the stacking direction of the battery cells 10 due to the expansion of the battery cells 10 When a force is applied to the cell 10, the displacement of each battery cell 10 and each cell holder 30 can be allowed by the extension length of the through hole 33. For this reason, it is possible to suppress breakage of the fixing member 3 (fastening members 50A and 50B) while suppressing the deformation of the battery module 1 as described above.

  The above embodiment describes one embodiment of the battery pack according to one aspect of the present invention. Therefore, the battery pack according to one aspect of the present invention is not limited to the battery pack 100 described above. In the battery pack according to one aspect of the present invention, the above-described battery pack 100 can be arbitrarily changed without changing the gist of each claim.

  For example, as shown in FIG. 5A, in the cell holder 30 (the outer holder 30A and the inner holder 30B), the fixing portions 31 and 32 can be provided as follows. Here, the fixing portions 31 and 32 are provided in a part of the side wall portions 30c and 30d in the second direction. More specifically, the fixing portion 31 is provided in the first portion P1 of the side wall portion 30c. The fixing portion 32 is provided in the second portion P2 of the side wall portion 30d. Here, the fixed part 31 and the fixed part 32 do not overlap each other when viewed from the third direction.

  Further, as shown in FIG. 5B, the fixing portions 31 and 32 may be provided as follows. That is, the fixing portions 31 and 32 are provided in a part of the side wall portions 30c and 30d in the second direction. More specifically, the side wall portions 30c and 30d include a first portion P1, a second portion P2, and a third portion P3 arranged along the second direction. And the fixing | fixed part 31 is provided in two parts, the 1st part P1 and the 3rd part P3 of the side wall part 30c, and the fixing | fixed part 32 is provided only in the 2nd part P2 of the side wall part 30d. It has been. Also in this case, the fixed part 31 and the fixed part 32 do not overlap when viewed from the third direction.

  In these cases, the following effects can be obtained. FIG. 6 is a schematic cross-sectional view for explaining an effect obtained by using the fixing portion shown in FIG. As shown in FIG. 6, when the plurality of battery modules 1 are arranged along the third direction, the fixing portion 31 of the cell holder 30 in one battery module 1 and another adjacent to the one battery module 1 are arranged. It becomes possible to arrange | position the fixing | fixed part 32 of the cell holder 30 in the battery module 1 so that it may mutually overlap seeing from a 2nd direction.

  Thereby, the through-hole 33 of the fixing part 31 in one battery module 1 and the through-hole 33 of the fixing part 32 in another battery module 1 are arranged in a line along the second direction (overlapping), Each battery module 1 can be collectively fixed to the mounting surface 2s of the housing 2 by the common fastening members 50A and 50B (can be fastened together). As a result, when mounting a plurality of battery modules 1 on the housing 2, the number of fastening members 50A and 50B can be reduced, and the whole can be downsized.

  As shown in FIG. 7, the battery module 1 may further include a plate member 60 that couples the fastening members 50A and 50B to each other. Here, the plate member 60 is disposed between the end of the cell holder 30 in the second direction (the end on the upper wall 30e side) and the head of the fastening members 50A and 50B, and is fastened together with the cell holder 30. The By using such a plate member 60, the above deformation of the battery module 1 can be reliably suppressed.

  Further, as shown in FIG. 8, the battery pack 100 is disposed at one end 20 a and the other end 20 b (that is, both ends) of the stacked body 20 in the first direction, and the battery module 1 is mounted on the mounting surface 2 s of the housing 2. A pair of fixing members 70 for fixing can be provided. Each of the fixing members 70 is disposed outside the end plate 41 in the stacking direction of the battery cells 10. The fixing member 70 includes a bracket 71 and a bolt 72 inserted through the bracket 71.

  The bracket 71 is formed in an L-shaped plate shape by a portion that extends in the second direction and contacts the end plate 41 and a portion that extends in the first direction and contacts the mounting surface 2s. In this case, for example, the battery module 1 is fixed by fixing the bracket 71 to the end plate 41 with a bolt (not shown) or the like, and fixing the bracket 71 fixed to the end plate 41 to the mounting surface 2s with the bolt 72. It is fixed to the mounting surface 2s.

  The fixing member 70 may be configured using the end plate 41 by integrally forming the bracket 71 and the end plate 41. That is, in the fixing member 70, the end plate 41 can be used as the bracket 71 by making the end plate 41 L-shaped. In this case, the battery module 1 can be fixed to the mounting surface 2 s of the housing 2 using the end plate 41 that applies a restraining load to the battery cell 10. Therefore, the number of parts can be reduced.

  Moreover, in the said embodiment, all the several cell holders 30 of the battery module 1 shall have a common structure. That is, both the outer holder 30 </ b> A and the inner holder 30 </ b> B include the fixing portions 31 and 32 provided with the through holes 33. However, for example, when the above-described fixing member 70 is used, the outer holder 30 </ b> A does not need to be used for fixing the battery module 1, and therefore does not need to include the fixing portions 31 and 32 provided with the through holes 33. Even if the outer holder 30 </ b> A includes the fixing portions 31 and 32, it is not necessary to insert the fastening member 50 </ b> A into the through hole 33.

  Furthermore, it is not necessary that all of the plurality of inner holders 30 </ b> B include the fixing portions 31 and 32. That is, at least one of the plurality of inner holders 30 </ b> B may include the fixing portions 31 and 32 provided with the through holes 33. Moreover, even if two or more inner holders 30B include the fixing portions 31 and 32, the fastening member 50B may not be inserted through all of them. That is, depending on the number of battery cells 10 and the manner in which the battery module 1 is fixed, the arbitrary cell holder 30 can be configured to include the fixing portions 31 and 32 provided with the through holes 33.

  Here, as shown in FIG. 9, each battery module 1 may further include an elastic member 80 and a middle plate 81. Here, the elastic member 80 is disposed between the other end 20 b of the stacked body 20 and the end plate 41. In other words, the elastic member 80 is laminated along with the battery cell 10 along the first direction. The middle plate 81 is disposed between the elastic member 80 and the stacked body 20. The elastic member 80 and the middle plate 81 are restrained by the restraining member 40 along the first direction together with the battery cell 10, and a restraining load is applied.

  On the other hand, as described above, the through hole 33 provided in the fixing portions 31 and 32 of the cell holder 30 and through which the fastening members 50A and 50B such as bolts are inserted is an elongated hole extending in the first direction. Therefore, when the battery cell 10 expands, the elastic member 80 is compressed in the first direction, and the fastening members 50A and 50B are relatively moved in the through hole 33, and the displacement of the battery cell 10 is allowed. That is, the displacement of the battery cell 10 is reliably permitted by the cooperation of the elastic member 80 and the through hole 33 which is a long hole. As a result, damage to the fixing member 3 is reliably suppressed. Note that the relative movement of the fastening members 50A and 50B within the through hole 33 means that the cell holder that holds the battery cell 10 with respect to the fastening members 50A and 50B that are inserted into the through hole 33 and fixed to the housing 2. That is, the position of the fastening members 50A and 50B in the through hole 33 is changed by moving the 30.

  The arrangement and the number of the elastic members 80 are not limited to the example in FIG. For example, the elastic member 80 may be disposed between the battery cells 10 adjacent to each other. Moreover, you may arrange | position the elastic member 80 in each between several pairs of battery cells 10 adjacent to each other. Further, the elastic member 80 may be disposed between the battery cells 10 adjacent to each other and between the battery cell 10 (laminated body 20) and the end plate 41.

  A battery pack capable of suppressing deformation of the battery module in a direction crossing the stacking direction of the battery cells can be provided.

  DESCRIPTION OF SYMBOLS 1 ... Battery module, 3 ... Fixing member, 10 ... Battery cell, 10A ... Outer cell, 10B ... Inner cell, 11f ... Bottom surface (opposite surface), 11e ... Upper surface (opposite surface), 12 ... Terminal, 20 ... Laminate body, 30 ... Cell holder, 30A ... Outer holder, 30B ... Inner holder, 30c ... Side wall part (first side wall part, second side wall part), 31 ... Fixed part (first fixed part, second fixed part), 33: Through hole (first through hole, second through hole), 40: Restraining member, 41: End plate, 50A, 50B ... Fastening member, 80 ... Elastic member, 100 ... Battery pack.

Claims (9)

A battery module;
A housing for housing the battery module;
A fixing member for fixing the battery module to the mounting surface of the housing,
The battery module includes a stacked body including a plurality of battery cells stacked in a first direction along the mounting surface, a plurality of cell holders for individually holding the battery cells, and the first direction. A restraining member for applying a restraining load to the battery cell along the
The plurality of battery cells include a pair of outer cells located at both ends of the stacked body in the first direction, and a plurality of inner cells disposed between the outer cells,
The plurality of cell holders include a pair of outer holders that hold each of the outer cells, and a plurality of inner holders that hold each of the inner cells,
The fixing member fixes the battery module to the mounting surface via at least one inner holder of the plurality of inner holders ,
The inner holder used for fixing the battery module includes a first side wall extending in a second direction intersecting the mounting surface, and a third direction intersecting the first and second directions. A first fixing portion protruding from the side wall portion of 1,
The first fixing portion is provided with a first through hole penetrating in the second direction,
The fixing member fixes the battery module to the mounting surface by inserting a fastening member through the first through hole.
Battery pack. The fixing member fixes the battery module to the mounting surface via two or more inner holders.
The battery pack according to claim 1. The battery cell includes a facing surface facing the mounting surface and a facing surface opposite to the facing surface,
The terminal of the battery cell is provided on the opposite surface,
The first side wall includes first and second portions arranged along the second direction,
The first fixing portion is provided in the first and second portions so as to cross the opposite surface from the opposing surface along the second direction.
The battery pack according to claim 1 or 2 . The first side wall includes first and second portions arranged along the second direction,
The first fixing portion is provided on one of the first and second portions.
The battery pack according to claim 1 or 2 . The first through hole is a long hole extending along the first direction.
The battery pack according to any one of claims 1 to 4 . The fixing member further fixes the battery module to the mounting surface via the outer holder.
The battery pack according to any one of claims 1 to 5 . The outer holder used for fixing the battery module includes a second side wall portion extending in a second direction intersecting the mounting surface, and a third direction intersecting the first and second directions. A second fixing portion protruding from the side wall portion of the two,
The second fixing portion is provided with a second through hole penetrating in the second direction,
The fixing member further fixes the battery module to the mounting surface by inserting a fastening member into the second through hole.
The battery pack according to claim 6 . The restraining member includes a pair of end plates disposed at both ends of the laminate in the first direction, and applies a restraining load to the battery cells by fastening the end plates to each other.
The fixing member further fixes the battery module to the mounting surface via the end plate.
The battery pack according to any one of claims 1 to 5 . The battery module includes an elastic member restrained by the restraining member along with the battery cells along the first direction.
The battery pack according to claim 5 .

Images