JP6939492B2 - Battery module - Google Patents

Description

The present disclosure relates to battery modules.

For example, Japanese Patent Application Laid-Open No. 9-306545 discloses a secondary battery for the purpose of structurally preventing abnormal heat generation generated when a battery is mechanically crushed inward (Patent Document). 1).

In the secondary battery disclosed in Patent Document 1, the current collectors of the positive electrode plate and the negative electrode plate are exposed at the innermost peripheral portion of the electrode plate group, and inside the exposed portion of the current collector. , Short circuit parts are arranged. At least one round of the exposed portion of the current collector faces the innermost portion via the separator. When the secondary battery is mechanically crushed inward, the exposed portion of the current collector of the positive electrode plate and the negative electrode plate is pressed against the short-circuit component, and the separator is broken, so that the positive electrode plate and the negative electrode plate are separated from each other. The current collector is short-circuited.

Japanese Unexamined Patent Publication No. 9-306545

The secondary battery disclosed in Patent Document 1 described above uses a short-circuit component arranged in the winding core space of the electrode plate group when the secondary battery is crushed by an excessive load from the outside. This is to avoid abnormal heat generation of the next battery.

However, in a battery module composed of an aggregate of a plurality of cell cells such as a battery for driving a vehicle, it is preferable to prevent the cell cells from being damaged when an excessive load is applied from the outside. On the other hand, when taking measures to prevent such damage to the cell, it is required to suppress the increase in the size of the battery module.

Therefore, an object of the present disclosure is to solve the above-mentioned problems, and to provide a battery module that reduces the impact on a cell when an excessive load is applied from the outside while suppressing an increase in the size of the body. Is.

The battery module according to the present disclosure has a cylindrical shape, a first set battery having a plurality of cell cells having a cylindrical shape, and a first heat dissipation plate provided with a plurality of holes into which the plurality of cell cells are inserted. It has a plurality of cells and a second heat-dissipating plate which is provided with a plurality of holes into which the plurality of cells are inserted and is arranged in parallel with the first heat-dissipating plate, and is adjacent to the first set of batteries. It is provided with a second set of batteries provided. The first heat-dissipating plate is a first side surface portion extending in a predetermined direction while facing the second heat-dissipating plate through a gap, and a first side surface portion protruding from the first side surface portion and arranged apart from each other in the predetermined direction. Includes a protrusion and a second protrusion. The second heat-dissipating plate has a second side surface portion that faces the first heat-dissipating plate through a gap, and a first recess and a first recess that are recessed from the second side surface portion and into which the first protrusion and the second protrusion are fitted, respectively. Includes 2 recesses.

According to the battery module configured in this way, when an excessive load is applied to the first set battery or the second set battery from the outside, the load is input to the first protruding portion and the second protruding portion. As a result, the load from the outside acts as a force for dividing the first heat-dissipating plate or the second heat-dissipating plate between the first protruding portion and the second protruding portion, so that the impact on the cell can be reduced. .. At this time, since the second heat-dissipating plate is provided with the first recess and the second recess in which the first protruding portion and the second protruding portion are fitted, respectively, the first heat-dissipating plate and the second heat-dissipating plate are brought closer to each other. Can be placed. As a result, the distance between the first set battery or the second set battery can be narrowed, and the physique of the battery module can be kept small.

As described above, according to the present disclosure, it is possible to provide a battery module that reduces the impact on the cell when an excessive load is applied from the outside while suppressing the increase in size of the physique.

It is a perspective view which shows the battery module in embodiment of this disclosure. It is a perspective view which shows the 1st set battery in FIG. It is a perspective view which shows the 2nd set battery in FIG. It is an disassembled assembly drawing which shows the 1st set battery in FIG. It is sectional drawing which shows the battery module seen from the arrow view direction on the VV line in FIG. It is a top view which shows typically the state in which the 1st set battery (the 1st heat dissipation plate) and the 2nd set battery (the 2nd heat dissipation plate) are combined.

Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same number.

FIG. 1 is a perspective view showing a battery module according to the embodiment of the present disclosure. FIG. 2 is a perspective view showing the first set battery in FIG. FIG. 3 is a perspective view showing the second set battery in FIG.

With reference to FIGS. 1 to 3, the battery module 10 is for driving a vehicle, and is powered by, for example, an internal combustion engine such as a gasoline engine or a diesel engine, and a motor supplied with power from a rechargeable battery. It is used for hybrid vehicles, plug-in hybrid vehicles that can be charged externally, and electric vehicles.

The battery module 10 has a substantially rectangular parallelepiped shape as a whole. The battery module 10 includes a first set battery 20A and a second set battery 20B. The first set battery 20A and the second set battery 20B are provided adjacent to each other. The first set battery 20A and the second set battery 20B are provided side by side in one direction in the horizontal direction.

Each of the first set battery 20A and the second set battery 20B has a substantially rectangular parallelepiped shape as a whole.

In the first set battery 20A and the second set battery 20B, the short side direction of the first set battery 20A in the plan view and the short side direction of the second set battery 20B in the plan view are aligned, and the first set battery 20A The longitudinal direction of the second set battery 20B in the plan view is aligned with the longitudinal direction of the second set battery 20B in the plan view. The arrangement direction of the first set battery 20A and the second set battery 20B is parallel to the lateral direction of each set battery of the first set battery 20A and the second set battery 20B in the plan view.

FIG. 4 is an disassembled and assembled view showing the first set battery in FIG. FIG. 5 is a cross-sectional view showing a battery module seen from the direction of arrow on the VV line in FIG.

With reference to FIGS. 1 to 5, the first set battery 20A includes a plurality of cell cells 30, a first heat dissipation plate 51, a cover 36, a plurality of positive electrode bus bar plates 41, an upper lid 42, and a negative electrode bus bar assembly. It has 46 and a bottom plate 47.

The cell 30 has a cylindrical shape. The plurality of cell cells 30 are arranged in a plane orthogonal to the axial direction of the cell cells 30 so that the axial directions of the cell cells 30 are parallel to each other. The plurality of cell cells 30 are arranged in a plane so that the axial direction of the cell cells 30 is the vertical direction. The cell 30 has a positive electrode terminal 31 and a negative electrode terminal 32. The positive electrode terminal 31 is provided at the upper end of the cell 30 in the axial direction. The negative electrode terminal 32 is provided at the lower end of the cell 30 in the axial direction.

The first heat dissipating plate 51 has a flat plate shape. The first heat dissipating plate 51 is provided parallel to the horizontal plane. The first heat dissipating plate 51 is provided so that its thickness direction is parallel to the vertical direction. The first heat dissipating plate 51 has a substantially rectangular plan view. In its plan view, the first heat dissipating plate 51 has a lateral direction (direction indicated by arrow 120 in FIG. 4) and a longitudinal direction having a length larger than the lateral direction (direction indicated by arrow 110 in FIG. 4). ) And.

The first heat dissipating plate 51 is provided with a plurality of holes 52. The plurality of holes 52 are arranged at intervals from each other. The hole 52 has a circular opening corresponding to the cross-sectional shape of the cell 30. The hole 52 penetrates the first heat dissipating plate 51 in the vertical direction. Each of the plurality of cell batteries 30 is inserted into the plurality of holes 52. The cell 30 is fixed to the inner peripheral surface of the first heat dissipation plate 51 that defines the hole 52 by the adhesive 34 (see FIG. 5).

The first heat dissipating plate 51 is formed of a metal having high thermal conductivity (for example, aluminum). The first heat dissipating plate 51 has a function of integrally holding the plurality of cell cells 30 and releasing heat from the plurality of cell cells 30. The first heat dissipating plate 51 has a thickness sufficient to hold the cell 30, for example, a thickness of 10 to 20 mm.

The cover 36 is provided so as to cover the plurality of cell cells 30 from above. The cover 36 is made of resin. A plurality of holes 37 are formed in the cover 36. The positive electrode terminal 31 of the cell 30 projects from the hole 37. The plurality of positive electrode bus bar plates 41 are provided above the cover 36. Each positive electrode bus bar plate 41 connects the positive electrode terminals 31 of the cell 30 to each other in several groups. The upper lid 42 is attached above the plurality of positive electrode bus bar plates 41.

The negative electrode bus bar assembly 46 is provided below the first heat dissipation plate 51. The negative electrode bus bar assembly 46 has a plurality of negative electrode bus bar plates 48. Each negative electrode bus bar plate 48 connects the negative electrode terminals 32 of the cell 30 to each other in several groups. The positive electrode bus bar plate 41 and the negative electrode bus bar plate 48 are connected to each other by a connecting bus bar (not shown).

The bottom plate 47 is attached below the negative electrode bus bar assembly 46. The bottom plate 47 is made of a metal having high thermal conductivity (for example, aluminum).

The second set battery 20B basically has the same structure as the first set battery 20A. The second set battery 20B includes a plurality of cell cells 30, a second heat dissipation plate 71, a cover 36, a plurality of positive electrode bus bar plates 41, an upper lid 42, a negative electrode bus bar assembly 46, and a bottom plate 47.

The second heat dissipating plate 71 is provided corresponding to the first heat dissipating plate 51 in the first set battery 20A. The second heat dissipating plate 71 is formed with a plurality of holes 72 corresponding to the plurality of holes 52 in the first set battery 20A. Each of the plurality of cell cells 30 is inserted into the plurality of holes 72. The cell 30 is fixed to the inner peripheral surface of the second heat-dissipating plate 71 that defines the hole 72 by the adhesive 34 (see FIG. 5).

The second heat dissipating plate 71 is arranged in parallel with the first heat dissipating plate 51. The second heat dissipating plate 71 is arranged in the same plane as the first heat dissipating plate 51. The second heat dissipating plate 71 is arranged in the same horizontal plane as the first heat dissipating plate 51.

The first heat dissipating plate 51 has a first side surface portion 53. The first side surface portion 53 extends in a predetermined direction while facing the second heat dissipating plate 71 via a gap 91. The first side surface portion 53 extends in the longitudinal direction (direction indicated by the arrow 110 in FIG. 4) of the first heat dissipating plate 51 in a plan view while facing the second heat dissipating plate 71 via a gap 91. There is.

The second heat dissipating plate 71 has a second side surface portion 73. The second side surface portion 73 faces the first heat dissipation plate 51 via a gap 91. The second side surface portion 73 extends parallel to the first side surface portion 53. The first side surface portion 53 and the second side surface portion 73 face each other through the gap 91.

FIG. 6 is a plan view schematically showing a state in which the first set battery (first heat dissipation plate) and the second set battery (second heat dissipation plate) are combined.

With reference to FIGS. 1 to 6, the first heat dissipating plate 51 has a first protruding portion 61p and a second protruding portion 61q. The first protruding portion 61p and the second protruding portion 61q have a convex shape protruding from the first side surface portion 53. The first protruding portion 61p and the second protruding portion 61q project from the first side surface portion 53 toward the second heat dissipating plate 71.

The first protruding portion 61p and the second protruding portion 61q are arranged apart from each other in a predetermined direction in which the first side surface portion 53 extends. The first protrusion 61p and the second protrusion 61q are arranged apart from each other in the longitudinal direction of the first heat dissipation plate 51 in the plan view.

The first protrusion 61p is arranged on one side of the first heat dissipation plate 51 with the center position 130 (see FIG. 2) in the longitudinal direction in the plan view thereof, and the second protrusion 61q is the first. The heat dissipating plate 51 is arranged on the other side of the center position 130 in the longitudinal direction in the plan view. The first protrusion 61p and the second protrusion 61q are arranged on both sides of the center position 130 in a well-balanced manner, and preferably the length between the center position 130 and the first protrusion 61p is the center position 130. And equal to the length between the second protrusions 61q.

The second heat dissipating plate 71 has a first recess 86p and a second recess 86q. The first recess 86p and the second recess 86q have a concave shape recessed from the second side surface portion 73. The length between the first recess 86p and the second recess 86q is equal to the length between the first protrusion 61p and the second protrusion 61q in the first heat dissipation plate 51. A first protruding portion 61p is fitted in the first recess 86p. A second protrusion 61q is fitted in the second recess 86q. The tip of the first protrusion 61p is in contact with the bottom of the first recess 86p. The tip of the second protrusion 61q is in contact with the bottom of the second recess 86q.

The second heat dissipating plate 71 further has a third protruding portion 81p and a fourth protruding portion 81q. The third protruding portion 81p and the fourth protruding portion 81q have a convex shape protruding from the second side surface portion 73. The third protruding portion 81p and the fourth protruding portion 81q project from the second side surface portion 73 toward the first heat dissipating plate 51.

The third protrusion 81p and the fourth protrusion 81q are arranged apart from each other in the longitudinal direction of the second heat dissipation plate 71 in the plan view.

The third protrusion 81p is arranged on one side of the second heat dissipation plate 71 with the center position 140 (see FIG. 3) in the longitudinal direction in the plan view thereof, and the fourth protrusion 81q is the second. The heat dissipating plate 71 is arranged on the other side of the center position 140 in the longitudinal direction in the plan view. The third protrusion 81p and the fourth protrusion 81q are arranged on both sides of the center position 140 in a well-balanced manner, and preferably, the length between the center position 140 and the third protrusion 81p is the center position 130. And equal to the length between the fourth protrusions 81q.

The third protrusion 81p is provided adjacent to the first recess 86p in the longitudinal direction of the second heat dissipation plate 71 in a plan view. The fourth protrusion 81q is provided adjacent to the second recess 86q in the longitudinal direction of the second heat dissipation plate 71 in the plan view.

The first heat dissipating plate 51 has a third recess 66p and a fourth recess 66q. The third recess 66p and the fourth recess 66q have a concave shape recessed from the first side surface portion 53. The length between the third recess 66p and the fourth recess 66q is equal to the length between the third protrusion 81p and the fourth protrusion 81q in the second heat dissipation plate 71. A third protrusion 81p is fitted in the third recess 66p. A fourth protrusion 81q is fitted in the fourth recess 66q. The tip of the third protrusion 81p is in contact with the bottom of the third recess 66p. The tip of the fourth protrusion 81q is in contact with the bottom of the fourth recess 66q.

The battery modules 10 shown in FIG. 1 may be combined in the vertical direction and / or the horizontal direction to form an in-vehicle battery pack.

Subsequently, the effects exerted by the battery module 10 in the present embodiment will be described.

In the present embodiment, the first heat dissipating plate 51 of the first set battery 20A is provided with the first protruding portion 61p and the second protruding portion 61q, and the first protruding portion 61p and the second protruding portion 61q provide the first protrusion. The first side surface portion 53 of the heat dissipating plate 51 and the second side surface portion 73 of the second heat dissipating plate 71 face each other via the gap 91.

With such a configuration, when an excessive load (force shown by an arrow 101 in FIG. 6) is applied to the first set battery 20A from the outside, the load is applied to the first protruding portion 61p and the second protruding portion. It is input to 61q. As a result, the load from the outside acts as a force for dividing the first heat dissipating plate 51 between the first protruding portion 61p and the second protruding portion 61q, so that the impact on the cell 30 in the first set battery 20A is applied. It can be mitigated.

Here, the larger the protruding lengths of the first protruding portion 61p and the second protruding portion 61q, the more effectively the effect of reducing the impact on the cell 30 is exhibited. On the other hand, if the protruding lengths of the first protruding portion 61p and the second protruding portion 61q are increased, the distance between the first set battery 20A and the second set battery 20B becomes large, and the physique of the battery module 10 becomes large.

On the other hand, in the present embodiment, the first recess 86p and the second recess 86q in which the first protrusion 61p and the second protrusion 61q are fitted to the second heat dissipating plate 71 of the second set battery 20B, respectively. Is provided.

With such a configuration, the first heat dissipating plate 51 and the second heat dissipating plate 71 can be arranged closer to each other, and the physique of the battery module 10 (width B in FIG. 1) can be suppressed to a small size. Further, the fitting structure of the first protruding portion 61p and the second protruding portion 61q and the first concave portion 86p and the second concave portion 86q is used for positioning when arranging the first set battery 20A and the second set battery 20B. Therefore, the workability at the time of assembling the battery module 10 can be improved.

Further, in the present embodiment, the second heat dissipating plate 71 of the second set battery 20B is provided with the third protruding portion 81p and the fourth protruding portion 81q, and the first heat dissipating plate 51 of the first set battery 20A is provided with the third. A third recess 66p and a fourth recess 66q into which the protrusion 81p and the fourth protrusion 81q are fitted are provided, respectively. The same effect as described above can be obtained by the fitting structure of the third protrusion 81p and the fourth protrusion 81q and the third recess 66p and the fourth recess 66q.

In the above, the case where an excessive load is applied to the first set battery 20A from the outside has been described, but the second case is also when an excessive load is applied to the second set battery 20B from the outside. It is possible to achieve the effect of reducing the impact on the cell 30 in the assembled battery 20B.

The structure of the battery module 10 according to the embodiment of the present disclosure described above will be collectively described. The battery module 10 according to the present embodiment includes a plurality of cell cells 30 having a cylindrical shape and a plurality of cell cells 30. A first set battery 20A having a first heat dissipation plate 51 provided with a plurality of holes 52 into which each is inserted, a plurality of cell cells 30 having a cylindrical shape, and a plurality of holes into which the plurality of cell cells 30 are inserted. 52 is provided, has a second heat dissipating plate 71 arranged in parallel with the first heat dissipating plate 51, and includes a second set battery 20B provided adjacent to the first set battery 20A. The first heat dissipating plate 51 projects from the first side surface portion 53 extending in a predetermined direction and the first side surface portion 53 while facing the second heat dissipating plate 71 through a gap 91, and is separated from each other in the predetermined direction. The first protruding portion 61p and the second protruding portion 61q to be arranged are included. The second heat dissipating plate 71 is recessed from the second side surface portion 73 with the second side surface portion 73 facing the first heat dissipating plate 51 via the gap 91, and the first protruding portion 61p and the second protruding portion 61q are fitted to each other. The first recess 86p and the second recess 86q are included.

According to the battery module 10 according to the embodiment of the present disclosure configured in this way, when an excessive load is applied to the battery module 10 from the outside while suppressing an increase in the physique of the battery module 10. The impact on the battery 30 can be effectively reduced.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and it is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The present disclosure applies, for example, to a battery module for driving a vehicle.

10 Battery module, 20A 1st set battery, 20B 2nd set battery, 30 cell, 31 positive electrode terminal, 32 negative electrode terminal, 34 adhesive, 36 cover, 37, 52, 72 holes, 41 positive electrode bus bar plate, 42 top lid, 46 Negative electrode bus bar assembly, 47 Bottom plate, 48 Negative electrode bus bar plate, 51 First heat dissipation plate, 53 First side surface, 61p 1st protrusion, 61q 2nd protrusion, 66p 3rd recess, 66q 4th recess, 71 2nd Heat dissipation plate, 73 2nd side surface, 81p 3rd protrusion, 81q 4th protrusion, 86p 1st recess, 86q 2nd recess, 91 gap, 130,140 center position.

Claims (1)

A first set battery having a plurality of cylindrical cells and a first heat-dissipating plate provided with a plurality of holes into which the plurality of cells are inserted.
It has a plurality of cylindrical cells and a second heat-dissipating plate which is provided with a plurality of holes into which the plurality of cells are inserted and is arranged in parallel with the first heat-dissipating plate. It is equipped with a second set battery that is installed next to the set battery.
The first heat dissipating plate is
A first side surface portion extending in a predetermined direction while facing the second heat dissipating plate through a gap,
A first protruding portion and a second protruding portion that protrude from the first side surface portion and are arranged apart from each other in the predetermined direction.
The second heat dissipating plate is
A second side surface portion facing the first heat dissipation plate via a gap,
It said recessed from the second side portion, seen including a first recess and second recess of the first projecting portion and the second projecting portion are fitted respectively,
A battery module in which the protruding lengths of the first protruding portion and the second protruding portion from the first side surface portion are larger than the length of the gap from the first side surface portion to the second side surface portion.

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