JP4590861B2 - Assembly of battery modules - Google Patents

Description

  The present invention relates to a battery module installed on a generally (generally) planar panel constituting a vehicle or the like, and an assembly thereof.

  In recent years, hybrid vehicles, electric vehicles, and fuel cell vehicles have been manufactured and sold from the viewpoints of environment and fuel efficiency, and new developments are continuing. In these so-called electric vehicles, it is essential to use a secondary battery that can be discharged and charged.

  Conventionally, metal cans have been mainly used for battery exteriors, but in recent years, there has been a dramatic increase in applications that need to suppress weight increases, such as mobile phones and laptop computers, and they are relatively lightweight. A so-called laminate battery in which battery elements such as electrodes, active materials, and electrolytes are hermetically sealed using a laminate film having flexibility in shape as an exterior has begun to be adopted. These metal can batteries and laminate batteries are called cells (or single battery cells) as a single unit, and are usually fixed to a case formed of resin, metal or the like and used as a battery module.

In order to fix the battery to the vehicle, the battery module is fixed to the vehicle with a bolt or the like. In such a battery module, the vibration from the vehicle is transmitted to the battery when the vehicle vibrates, which may adversely affect the battery. Therefore, for example, as described in Patent Document 1, a spring member is installed, or as described in Patent Document 2, a deformable portion that allows the battery to be displaced relative to the assembly member is provided. It has been broken.
JP 2001-135299 A JP 2001-268717 A

  However, in battery modules according to the prior art such as Patent Documents 1 and 2 or the like, vibration transmission to a battery module mounting portion, a cell installed inside the battery module, or a component inside the cell is suppressed. It only reduces the amount of vibration and contributes little to vibration control of the vehicle.

  On the other hand, suppression of vibration is essential in vehicles, and in general vehicles, countermeasures such as installing plate-shaped damping materials on substantially planar panels such as floors and roofs are taken. When a battery module according to the prior art is mounted on a vehicle, the place where it can be installed is very limited due to the effective use of space and the problem of heat. For example, it is desirable to be installed under the floor or the like, but for example, when installed on the floor with bolts or the like, there is no vibration damping effect, and it is necessary to provide a separate vibration damping device. In addition, since the panel partially increases in weight, there is a possibility that vibration is increased. In this case, it is necessary to provide a vibration control device that is higher than usual. Therefore, when the battery module is installed on a substantially planar panel, there is a problem that the weight, volume, number of parts, assembly man-hours, etc. increase as a whole vehicle.

  Therefore, an object of the present invention is to transmit vibration to a battery module mounting portion, a cell installed inside the battery module, and further to a component inside the cell in a battery module installed on a substantially planar panel constituting the vehicle. It is intended to provide a battery module and an assembly thereof that can suppress the vibration of the vehicle.

  Furthermore, the present invention provides a battery module capable of reducing the weight, volume, number of parts, assembly man-hours and the like as a whole vehicle in addition to the above object.

The present invention has been made in view of the above-described problems of the prior art. That is, the present invention is a battery module installed on a substantially planar panel constituting the vehicle,
This is achieved by a battery module and an assembly thereof that are installed in a vehicle body via a flexible layer integrated with an exterior case.

  According to the present invention, the battery module is installed in a substantially planar panel constituting a vehicle or the like, and is installed in the vehicle body via a flexible layer integrated with an exterior case. By using the battery module and the assembly thereof, a battery module having a vibration damping effect for a vehicle or the like and the assembly thereof are provided.

  According to the present invention, when the battery module is installed on the substantially planar panel, the battery module is configured to be installed on the vehicle body through the flexible layer integrated with the exterior case, Thus, the vibration damping function of the vehicle by the flexible layer can be realized integrally.

  Hereinafter, embodiments of the battery module and the assembly thereof according to the present invention will be described with reference to the drawings. However, the present invention is not limited to these embodiments.

(First embodiment)
In the first embodiment of the battery module and the assembly thereof according to the present invention, the battery module in the center part of the panel has a flexible layer arranged in one letter, and the battery module in the peripheral part of the panel faces the apex of the panel. 1 shows an embodiment in which flexible layers are radially arranged.

  In addition, the battery module in this embodiment satisfies the following requirements. That is, the battery module is installed on a substantially planar panel constituting the vehicle, and is installed on the vehicle body via a flexible layer integrated with the exterior case. A plurality of battery modules are installed on the panel having the one substantially planar shape. Furthermore, when installing a plurality of battery modules on this single panel, install at least three (preferably an odd number) in the direction of the representative length (for example, the maximum length) of the panel and pass through the center of gravity of the panel. A flexible layer is arranged in a straight line.

  First, FIG. 1 shows a cross-sectional view showing the internal structure of a general battery module that can be used in this embodiment.

  As shown in FIG. 1, a plurality of unit cells 2 are fixed inside a case 11 of a resin battery module via a cell fixing structure 3 so as to be stacked with a certain space therebetween. Yes. Each single battery cell 2 is a so-called laminate package using a laminate film for its exterior. By sandwiching these cells 2 from both sides with a fixing structure 3, the fixing structure 3 is fixed to the case 1, The battery (each single battery cell 2) and the outer case 11 are integrated. In addition, cell electrodes are provided at both ends of each single battery cell 2, connected to each other by a conductor current collector 4, taken out of the outer case 11 from the terminal extraction portion 5, and electrically connected to the electrode terminal 6 of the battery module. Thus, the battery module 1 is configured. On the other hand, an attachment surface (attachment portion) 8 to the vehicle body structure is formed on the vehicle body attachment surface of the outer case 11 of the battery module via an integrally molded flexible layer 7. Here, the flexible layer 7 is formed by a method in which resin materials having different physical properties, such as two-color molding or foam molding, are bonded while maintaining sufficient adhesion. In addition, the flexible layer 7 may be formed on the entire bottom surface of the outer case of the battery module 1. However, from the viewpoint of effectively exhibiting the vibration damping effect of the vehicle and further achieving stability and weight reduction after the battery module is installed. Is preferably formed in a specific shape as illustrated in FIGS.

  In actual installation in a vehicle, a plurality of battery modules are usually used, and therefore, in many cases, a plurality of battery modules are installed on one substantially flat panel surface constituting the vehicle. Here, there are no particular restrictions on the generally planar panel constituting the vehicle on which a plurality of battery modules can be installed. For example, the front floor, the rear floor, the trunk floor, and the rear bulk are not limited. Heads and panels are listed, but they are not limited to these because they differ depending on the type of vehicle such as large vehicles and commercial vehicles as well as passenger cars. In addition, from the viewpoint of weight reduction and strength design etc., the almost flat shape has a space part or uneven part formed in a part of the flat panel, or these flat panels are joined and integrated. This is because the battery module can also be installed in the panel as described above. Moreover, although the number of battery modules installed depends on the number of cells in the battery module, it is appropriately determined from the output, capacity, etc. required according to the intended use.

  FIG. 2 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9. Actually, the battery module 1 is attached to the panel 9 via the flexible layer 7 and the attachment portion (not shown; refer to reference numeral 8 in FIG. 1). 2-11, the relative position of the battery module 1 and the flexible layer 7 is schematically shown as a perspective view of FIG. 1 viewed from above. In the case of this embodiment, three battery modules are installed for one panel 9, and three battery modules are arranged side by side in the maximum length direction = long side direction which is one of the representative lengths of the panel 9. ing.

In addition, the battery module 1b at the center of the panel 9 has a flexible layer 7a in a single character over the entire length of the module 9 in the short side direction (flexible in a straight line passing through the center of gravity G of the panel 9). It can also be said that the layer 7a is disposed). Further, both ends of the battery module 1a in the periphery portion of the panel, 1c are flexible layer 7b are arranged radially toward the approximate center of the panel 9 to the vertex C ₁ -C _4. FIG. 13 is an enlarged view of the battery module 1a shown on the left side of FIG. 2 in the present embodiment. The attachment portion 8 is generally along the flexible layer 7 and has a shape having a flange for attachment to a panel (not shown). Reference numeral 14 in the figure indicates a position of a bolt hole for attachment to the panel. Further, FIG. 14 is a cross-sectional view along arrow AA ′ of FIG. 13 in the present embodiment. A state in which the main body (exterior case) of the battery module 1a and the attachment portion 8 are integrally formed through the flexible layer 7 is shown. Reference numeral 15 in the figure denotes a bolt hole for mounting to the panel. The battery module can be fixed to the vehicle by fastening with a bolt between this and a mounting bolt hole provided on the panel side.

  Next, materials of main constituent members in the present embodiment will be described. For the outer case 1 and the mounting portion 8 forming the battery housing portion of the battery module, olefin resins such as polypropylene and polyethylene, polyamide resins such as ABS resin, nylon 6, and 66, phenol resins, and the like are preferably used. However, it is not limited to these. The flexible layer 7 is preferably selected from soft polypropylene, soft polyamide, soft polyurethane, various elastomers, and the like, which have good adhesion to the outer case and the mounting portion that form the module battery housing portion. However, it is not limited to these materials.

  Next, the operation of this embodiment will be described. The most important aspect of panel vibration is the reduction of the first-order mode, that is, the vibration mode of the center line connecting the centers of the long and short sides in a roughly rectangular panel. For this purpose, it is important to suppress vibration near the center of the panel. In the present embodiment, the center line in the long side direction is divided into three parts, that is, odd-numbered parts, and the center part is fixed by the battery module 1b in the center, so that primary vibration with the center as an antinode is suppressed. . That is, since the battery module 1b is disposed at a position passing through the center of gravity G of the panel 9, vibrations in the first mode with the center (center of gravity) of the panel as an antinode are effectively absorbed. Even-numbered division cannot suppress deformation at the center of the panel, so the vibration damping effect is low. Further, the vibration in the center line in the short side direction is absorbed by the flexible layer 7 of the battery module 1b in the center. That is, by arranging the flexible layer 7 of the battery module 1b in one character along the center line in the short side direction, the vibration mode of the center line is effectively reduced. Further, with respect to the diagonal direction, the flexible layers 7 of the battery modules 1a and 1c at both ends are radially disposed near the diagonal direction of the panel 9 and have an action of suppressing vibration near the center.

  That is, by arranging the flexible layer in a straight line passing through the center of gravity of the panel, a vibration damping effect can be obtained, but as described in the operation of the present embodiment, among the straight lines passing through the center of gravity of the panel, It can be said that it is desirable to dispose the flexible layer in a center line connecting the centers of the long and short sides and a diagonal line of the panel (a line extending radially from the center toward the apex). However, as shown in FIGS. 2 to 11, these flexible layers are preferably provided as close to the center line or the diagonal as possible, but are not necessarily formed on the center line or the diagonal.

  That is, the number of battery modules to be installed in this embodiment is three, preferably three or more, odd for one panel. In order to effectively exhibit the vibration damping effect, the center is a belly. This is because the secondary vibration is suppressed. The same can be said for other embodiments, for example, the embodiments of FIGS. 3 to 9 (three examples) and FIG. 10 (nine examples). In the present invention, the number of battery modules to be installed includes one case for one panel 9. In addition, even in the case of two or more even numbers, the vibration suppression effect can be effectively achieved as compared with the conventional case. Needless to say, a configuration that can be expressed is included in the technical scope of the present invention.

At this time, it is desirable that the dielectric loss tangent at 10 to 1000 Hz of the resin material constituting the flexible layer is in the range of 1.0 × 10 ^{−3 to} 5.0 × 10 ⁻¹ in the temperature range of −30 ° C. to 80 ° C. The anti-vibration frequency required for the battery module is in the range of 10 to 1000 Hz. If the frequency is less than 10 Hz, there is a low possibility that a resonance frequency exists due to the size of the battery module. There is no need to shake. Moreover, although the vibration reduction effect of the material depends on the loss tangent, it is difficult to directly measure the loss tangent of the soft resin as in the present embodiment, and as a substitute characteristic, a dielectric loss tangent substantially corresponding to the loss tangent is used. be able to. This dielectric loss tangent is desirably in the range of 1.0 × 10 ^{−3 to} 5.0 × 10 ⁻¹ . If less than 1.0 × 10 ⁻³ , the resin is too soft and the possibility of sag due to the weight of the battery module increases, and if it exceeds 5.0 × 10 ⁻¹ , a sufficient damping effect cannot be obtained. .

  At this time, the thickness of the flexible layer is preferably 1 to 50 mm. If it is less than 1 mm, the damping effect is small because there are few flexible parts, and if it exceeds 50 mm, it is difficult to mold the flexible layer and handle the module, and the module itself may vibrate and may adversely affect the battery. Because.

(Second Embodiment)
In the second embodiment of the battery module according to the present invention, the battery module in the center portion of the panel also has a flexible layer arranged in one letter, and the battery modules in the peripheral portion of the panel are radially flexible toward the top of the panel. Other embodiment which satisfies the requirements (henceforth the requirements of the 1st and 2nd embodiment) of arranging a layer is shown.

  In addition, the battery module in the present embodiment also satisfies the following requirements (included in the requirements of the first and second embodiments) as in the first embodiment. That is, the battery module is installed on a substantially planar panel constituting the vehicle, and is installed on the vehicle body via a flexible layer integrated with the exterior case. A plurality of battery modules are installed on the panel having the one substantially planar shape. Furthermore, when installing a plurality of battery modules on this single panel, install at least three (preferably an odd number) in the direction of the representative length (for example, the maximum length) of the panel and pass through the center of gravity of the panel. A flexible layer is arranged in a straight line.

  FIG. 3 is a schematic diagram showing the shapes of the module 1 and the flexible layer 7 on the installation panel surface 9 in the present embodiment.

  The present embodiment is an example in which three battery modules 1 are installed in the short side direction of the panel 9 in comparison with the first embodiment, and a total of nine battery modules 1 are installed. This is particularly effective when the panel is relatively large with respect to the size. Thereby, since many battery modules can be mounted, it is possible to provide a high-power and high-capacity vehicle driving power source. In the present embodiment, as shown in FIG. 3, vibrations in the linear direction (short side direction) are suppressed by the flexible layer 7a arranged in a straight line (in a single character) in the center, and the diagonal direction (panel) The flexible layer 7b (radially arranged toward the apex) has an action of suppressing vibrations in the long side direction and the diagonal direction.

(Third embodiment)
The third embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the first and second embodiments, wherein the battery module at the periphery of the panel is radially flexible toward the apex of the panel. And an arrangement that satisfies the requirement (hereinafter also referred to as the requirement of the third embodiment) that the flexible layer is arranged along the panel center line of the battery module (see FIG. 2B). The form is shown.

  FIG. 4 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9.

  In the present embodiment, in addition to the first embodiment, the flexible layer 7c is provided along the long side direction of the panel 9 (that is, along the panel center line) at the center of the battery modules 1a and 1c at both ends of the panel. Is arranged. Thereby, it has the effect | action which suppresses the vibration of the long side direction of the panel 9 further.

(Fourth embodiment)
According to a fourth embodiment of the battery module of the present invention, in the battery module that satisfies the requirements of the first to third embodiments, the battery module in the center portion of the panel has a requirement that a flexible layer is arranged in a cross shape ( Hereinafter, an embodiment that satisfies the requirement of the fourth embodiment) is shown.

  FIG. 5 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 on the installation panel surface 9 in the present embodiment.

  In the present embodiment, in addition to the first embodiment, a flexible layer 7d is arranged along the long side direction of the panel 9 in the central portion of the battery module 1b in the central portion of the panel (that is, the central portion of the panel). In the battery module 1b, the flexible layers (7a, 7d) are arranged in a so-called cross. Thereby, it has the effect | action which suppresses the vibration of the long side direction of a panel further.

(Fifth embodiment)
The fifth embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the first to fourth embodiments, wherein the battery module in the center of the panel has a flexible layer arranged in a cross shape, and the panel The battery module at the periphery of the battery module has a requirement that the flexible layer is arranged radially toward the apex of the panel and the flexible layer is arranged along the center line of the battery module (hereinafter also referred to as a requirement of the fifth embodiment). .) Shows an embodiment that satisfies the above.

  FIG. 6 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9.

  In the present embodiment, in addition to the fourth embodiment, the flexible layer 7c is provided along the long side direction of the panel 9 (that is, along the panel center line) at the center of the battery modules 1a and 1b at both ends of the panel. Is arranged. Thereby, it has the effect | action which suppresses the vibration of the long side direction of a panel further.

(Sixth embodiment)
The sixth embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the first and second embodiments. In the battery module in the center of the panel, a flexible layer is arranged in one character. The battery module in the peripheral portion shows one embodiment that satisfies the requirement that the flexible layers are arranged diagonally of the battery module (hereinafter also referred to as the requirement of the sixth embodiment).

  FIG. 7 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 on the installation panel surface 9 in the present embodiment.

  In the present embodiment, in the first embodiment, the arrangement of the flexible layer on the battery module at the center of the panel is the same as in the first embodiment, but the arrangement of the flexible layer on the battery modules at both ends of the panel is as follows. Unlike the first embodiment, in the battery modules 1a and 1c at both ends of the panel, the flexible layer 7e is disposed along the diagonal line of the battery modules 1a and 1c. Thereby, in addition to the diagonal direction of the panel 9, it has the effect | action which suppresses the vibration of a long side direction.

(Seventh embodiment)
The seventh embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the sixth embodiment, wherein the battery module in the peripheral portion of the panel has a flexible layer arranged diagonally to the battery module. 1 shows an embodiment that satisfies a requirement that a flexible layer is disposed along a panel center line of a battery module (hereinafter also referred to as a requirement of a seventh embodiment).

  FIG. 8 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9.

  In the present embodiment, in the battery modules 1a and 1c at both ends of the panel of the sixth embodiment, in addition to the flexible layer 7e arranged along the diagonal line of the battery modules 1a and 1c, The flexible layer 7c is arranged in a straight line (along the panel center line) (that is, in the battery modules 1a and 1c at both ends of the panel, the flexible layer is arranged in a so-called * mark shape). Thereby, it has the effect | action which suppresses the vibration of the long side direction of a panel further.

(Eighth embodiment)
The eighth embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the sixth and seventh embodiments, wherein the battery module in the center of the panel has a requirement that a flexible layer is arranged in a cross shape ( Hereinafter, an embodiment that satisfies the requirement of the eighth embodiment) is shown.

  FIG. 9 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9.

  In the present embodiment, in the battery module 1b at the center of the panel of the seventh embodiment, in addition to the flexible layer 7a arranged in a straight line in the short side direction of the panel 9, the flexible layer 7d in a straight line also in the center. (That is, in the battery module 1b at the center of the panel, the flexible layer is arranged in a so-called cross shape). Thereby, it has the effect | action which further suppresses the vibration of the long side direction of a panel.

(Ninth embodiment)
The ninth embodiment of the battery module according to the present invention is a battery module that satisfies the requirements of the sixth to eighth embodiments, wherein the battery module at the center of the panel has a cross-sectionally flexible layer, and the panel The battery module in the periphery of the battery module has a requirement that the flexible layer is arranged diagonally with the battery module and the flexible layer is arranged along the center line of the battery module (hereinafter also referred to as a requirement of the ninth embodiment). One embodiment which satisfies the above is shown.

  FIG. 10 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 on the installation panel surface 9 in the present embodiment.

  In the present embodiment, three battery modules 1a to 1c of the eighth embodiment are arranged, or the short side direction of the panel is divided into three, and the arrangement of the flexible layer of each battery module is the same as that of the eighth embodiment. The configuration is equivalent. This embodiment is effective when the size of the panel is relatively larger than that of the battery module and it is necessary to particularly suppress the vibration in the illustrated lateral direction.

(Tenth embodiment)
According to the tenth embodiment of the battery module of the present invention, when a plurality of battery modules are installed on one panel, the gap between the battery modules is discontinuous from the end of the panel to the other end (hereinafter referred to as the following). , Which is also referred to as a requirement of the tenth embodiment).

  In addition, the battery module in this embodiment satisfies the following requirements. That is, the battery module is installed on a substantially planar panel constituting the vehicle, and is installed on the vehicle body via a flexible layer integrated with the exterior case. A plurality of battery modules are installed on the panel having the one substantially planar shape. The requirements are the same as those in the first embodiment, and will be omitted.

  FIG. 11 is a schematic diagram showing the shapes of the battery module 1 and the flexible layer 7 in the present embodiment on the installation panel surface 9.

In this example, as in the first to ninth embodiments, a plurality of battery modules and further a flexible layer of the battery modules are not regularly arranged on the panel surface, and the panel is continuous from one side to the opposite side. clearance (e.g., in Figure 10 is another embodiment, to form a gap clearance d ₁ and d ₂ are continuous from one side to the opposite side) are arranged battery modules so is not present. That is, in FIG. 11, for example, the gap d ₁ and d ₂ are so as not to gaps continuously from one side of the panel to the opposite side, has an arrangement in which there are cell module 1d and 1e on the way. As a result, the panel does not break at the line connecting the opposing sides, so vibrations with particularly low orders can be suppressed.

  In addition, in FIG. 11, although the flexible layer 7 showed the example which has arrange | positioned the flexible layer to one character in the center part of all the battery modules, if this is a range which does not impair the said effect | action, it is arbitrary for each battery module. Needless to say, a flexible layer of the shape may be arranged.

(Eleventh embodiment)
According to an eleventh embodiment of the battery module of the present invention, in the battery module satisfying the requirements of the first to tenth embodiments, (1) when the single battery cell is fixed in the outer case, the soft resin potting is used. 1 shows an embodiment that satisfies the requirement that a material is used and (2) a part of the potting material is used as a flexible layer (hereinafter also referred to as a requirement of the eleventh embodiment). Further, in the present embodiment, (3) the flexible layer may be formed at the same time as the outer case or the potting material filled in the outer case.

  A cross-sectional view showing the internal structure of the battery module of this embodiment is shown in FIG. As shown in FIG. 12, the single battery cell 2 is fixed inside the outer case 11 of the resin battery module 1 via a potting material 10. Each unit cell 2 is a so-called laminate package using a laminate film for its exterior, and cell electrodes are provided at both ends of each unit cell 2, which are connected by a conductor current collector 4, and a terminal The battery module 1 is configured by taking it out of the outer case from the take-out part 5 and connecting it to the electrode terminal 6 of the module cover part 12. The module lid 12 in which the battery and the electrode are integrated is assembled to the outer case 11 of the module. On the other hand, an attachment surface (attachment portion) 8 to the vehicle body structure is formed on the vehicle attachment surface of the outer case 11 of the battery module via an integrally formed flexible layer 7.

  Here, the flexible layer 7 is a method of bonding resin materials having different physical properties such as two-color molding and foam molding while maintaining sufficient adhesion, and the thickness is reduced by the same material to improve flexibility. It is molded by the method of At this time, in order to satisfy the requirement (3), the flexible layer may be molded simultaneously with a resin material for the outer case or a potting material filled in the outer case.

  Further, the space inside the outer case 11 passes through the inner side of the flexible layer 7 to the attachment surface (attachment portion) 8. After the module lid 12 is assembled to the outer case 11, the potting material 10 is injected from the potting material injection port 13 and solidified. 15, the flexible layer of the battery module having the internal structure of FIG. 12 (a part of the potting material is used as the flexible layer as in the requirement (3) above) is formed in a shape as shown in FIG. 13. It is an AA 'cross section B arrow line view of FIG. Here, the thickness of the portion of the attachment surface (attachment portion) 8 to the vehicle body structure that is in contact with the potting material 10 (also used as the flexible layer 7) is thinner than the flange-like portion, but is not limited thereto. Instead, the thickness is designed according to the strength requirements of the battery module and the mounting surface (mounting portion). Here, the potting material 10 is preferably a resin material that is flexible and does not adversely affect metal parts such as current collectors and terminals, such as epoxy resin, urethane resin, nylon resin, olefin resin, and the like. Olefin-based elastomers are also possible. Reference numeral 15 in the figure denotes a bolt hole for mounting to the panel.

In the present embodiment, the potting material that fixes the battery is also used in the damping region to exhibit a damping effect. In this embodiment also, the dielectric tangent at 10 to 1000 Hz of the resin material used as the potting material is in the range of 1.0 × 10 ^{−3 to} 5.0 × 10 ⁻¹ in the temperature range of −30 ° C. to 80 ° C. It is desirable to be. The reason is the same as in the first embodiment. Furthermore, it is desirable that the thickness of the flexible layer is the same as in the first embodiment.

  The above is a typical embodiment of the battery module and its assembly installed in the vehicle body via the flexible layer integrated with the exterior case of the present invention, but the present invention is not limited to these. is not. For example, in each of the above embodiments, only three to nine battery modules are shown. However, if the installation space is vertically long, it may be possible to arrange five battery modules in the long side direction of the panel. It is done. Alternatively, even when the assembly of three to nine battery modules is stacked in two stages, if the present invention is applied at least to the configuration of the assembly side of the battery modules installed on the panel, the vibration of the vehicle body is reduced. Can be suppressed. In this case, it goes without saying that the present invention may also be applied to connect the lower battery module assembly to the configuration of the upper battery module assembly side to be stacked. In the present invention, a battery module and an assembly thereof may be arranged on a plurality of substantially planar panels constituting the vehicle. In this case, the present invention may be applied to each panel. Yes.

  In the present invention, the arrangement of the flexible layer is defined as one character, ten characters, straight line, radial line, diagonal line, along the center line, etc., and these will be described with reference to the drawings. However, the present invention is not necessarily limited to the embodiment shown in the drawings. For example, the flexible layer of the battery module in the center of FIGS. 2 and 4 shows a continuous form, but this may be arranged along the one character, straight line or center line, and is partially discontinuous. It may be. That is, for example, as in the flexible layer 7a in FIG. 3, the flexible layer in FIGS. 2 and 4 also has a plurality of flexible layer blocks formed at appropriate intervals, even if the long side direction or short side direction of the panel 9 is formed. If the effect of suppressing vibrations such as the above can be effectively exhibited, it can be said that they are arranged along one character, a straight line or a center line. Further, in the radial and diagonal lines, for example, as shown in the arrangement example of the flexible layers of the battery modules at both ends in FIGS. 2 to 10, these lines are not necessarily located directly above the radiation or directly above the diagonal lines. Even if it is located in the vicinity of, as described above, if the effect of suppressing the radiation of the panel 9 or the vibration in the diagonal direction can be effectively exhibited, it is arranged in a radial or diagonal manner. It can be said that there is.

  Moreover, in this invention, if the space | interval between the battery modules in each said embodiment is in the range which does not impair the vehicle vibration suppression effect of this invention, ensuring of the heat dissipation (breathability) of each battery module and the time of a maintenance It is desirable to provide a certain interval from the standpoint of operability, etc. If an optimum interval is appropriately provided according to the amount of heat generated by the battery module determined by the number of stacked unit cells in the battery module, etc. Good.

  Further, in the present invention, the mounting portion is provided between the panel and the flexible layer so that the vehicle vibration suppression effect can be effectively exhibited by being installed on the vehicle body via the flexible layer integrated with the exterior case. It is desirable to form the mounting portion, but the shape of the mounting portion is preferably slightly larger than the flexible layer as shown in FIG. Needless to say, in terms of stability, the same size as the lower surface of the outer case may be provided. Further, there is no particular limitation such that an attachment portion having a size that spans a plurality of battery modules may be integrally formed. As described above, the attachment portion may be any member as long as it has a certain strength against an external load and is excellent in adhesiveness with the flexible layer, like the exterior case. The thickness of the mounting portion is preferably 2 to 15 mm. If it is less than 2 mm, it will be difficult to ensure sufficient mounting strength with mounting bolts or the like. On the other hand, when the thickness exceeds 15 mm, it is difficult to mold and handle the module, as in the case of the flexible layer, and the module itself may be vibrated to adversely affect the battery. In addition, this attachment part does not necessarily need to be formed in the battery module side, and may be provided in a vehicle body structure depending on the case. In particular, when a metal material can be used for the mounting portion, it is advantageous to form it as a part of the vehicle body structure from the viewpoints of strength, reduction in man-hours and number of parts.

  Moreover, in this invention, although the flexible layer is made into one layer, as needed, you may give a still more vibration-proof property as a multilayer structure. When a plurality of battery modules are arranged, a flexible layer may be formed using a resin material having different characteristics for each battery module, and within each battery module, the short side direction and the long side direction Alternatively, the flexible layer may be formed using a resin material having different characteristics according to the difference in the diagonal direction or the like, and can be appropriately selected within a range that does not impair the effects of the present invention. From the same viewpoint, it goes without saying that the outer case and the flexible layer may be formed integrally with each other via another third layer. This is because a higher value-added product can be provided by interposing a material excellent in adhesiveness, heat dissipation and the like in the third layer. For the same reason, another third layer may be interposed between the flexible layer and the attachment portion.

  Further, in the present invention, the method of installing the battery module on the vehicle body is not particularly limited. As shown in FIGS. 14 and 15, bolts are passed through the mounting holes provided in the mounting portion, so that the panel on the vehicle body side is installed. However, the present invention is not limited to these, and as long as it is within a range that does not impair the effects of the present invention, as a conventionally known vibration transmission suppressing means as shown in the prior patent document, a spring is used. There is no particular limitation such as installing a member or installing a deformable portion that can be displaced relative to the mounting panel.

  Further, in the present invention, the vibration-damping effect of the vehicle body (vehicle) after the battery module is installed on the vehicle body is the most effective embodiment using existing simulation software such as NASTRAN, VIBRANT, SYSNOISE, etc. The width, thickness, and shape of the flexible layer in each embodiment can be examined, but if necessary, the vibration transfer characteristic may be examined by performing an excitation test.

  Further, the battery module of the present invention is the same as described in the background art, and may have a general internal structure as described in FIGS. 1 and 12. Control circuitry such as the above may be housed inside the module, or may be outlined, and such electrical wiring, control circuitry, etc., are within the range that does not impair the operational effects of the present invention. However, it is not particularly limited, and a conventionally known configuration can be adopted.

  In addition, as the shape of the battery module of the present invention, an example using a rectangular parallelepiped (box shape) module suitable for housing a plurality of single battery cells has been shown, but is not limited thereto. A cylindrical module or the like may be used, or a combination of these may be used. Moreover, although the example which uses the same magnitude | size of a module was shown, it cannot be overemphasized that two or more types of modules from which a magnitude | size (a dimension and volume) differ may be used in combination appropriately, for example. This is because the present invention can be effectively applied to these cases.

  Furthermore, in the present invention, the outer case of the battery module may be a laminate package using a laminate film as used for the outer packaging material of the single battery cell. This is advantageous in that the weight can be further reduced. Even in such a case, the same internal structure as shown in FIG. 1 can be taken. Moreover, if the resin material which is excellent in adhesiveness with a flexible layer is used for the skin resin layer of a laminate film, it can also be integrated with an exterior case. In addition, in the laminate package used as an exterior case, form stability may be ensured by using a film thicker than the exterior of the single battery cell.

  Furthermore, in the present invention, it is desirable that the single battery cell of the battery module in each of the above embodiments is a lithium ion secondary battery. In the present invention, the single battery cell is particularly limited, for example, a lithium ion secondary battery, a sodium ion secondary battery, a potassium ion secondary battery, a nickel hydride secondary battery, a nickel cadmium secondary battery, a nickel hydride battery, or the like. Although various conventional batteries can be applied, lithium ion secondary batteries are preferable. This is because the lithium ion secondary battery has a large voltage, can achieve a high energy density and a high output density, and is excellent as a vehicle driving power source or an auxiliary power source. However, the same battery need not always be used for these, for example, a bipolar lithium ion battery suitable for large current discharge, a normal non-bipolar lithium ion battery suitable for large capacity, and other nickel-hydrogen batteries. A combination with a secondary battery may also be used. Further, the internal structure (for example, battery type, capacity, number of cells, etc.) may be changed for each battery module. In addition, the configuration of the single battery cell such as a lithium ion battery is not particularly limited, and conventionally known ones can be widely applied. However, as described above, in the laminate package using the laminate film for the exterior It is desirable to be. This is because the waterproofness and sealing property of the battery can be secured, the weight of the battery can be reduced, and external impact and environmental degradation during use can be prevented. Here, the laminate film used for the exterior means a polymer metal composite film. The polymer metal composite film is not particularly limited, and any conventionally known one can be appropriately applied. For example, a metal (including alloy) layer such as aluminum, stainless steel, nickel, copper, or the like. A polymer metal composite film having both surfaces coated with an insulating resin layer can be used. Examples of the insulator (preferably heat resistant insulator) resin layer include a polyethylene tetraphthalate film (heat resistant insulating film), a nylon film (heat resistant insulating film), a polyethylene film (heat fusion insulating film), and a polypropylene film. (Heat-fusing insulating film).

  Furthermore, the present invention is an automobile characterized in that the battery module and the assembly thereof in each of the above embodiments are installed on a panel constituting a plane. As a vehicle in which the battery module and the assembly thereof can be mounted as a driving power source or an auxiliary power source, an electric vehicle, a hybrid electric vehicle, a fuel cell vehicle, a hybrid fuel cell vehicle, and the like are preferable, but the vehicle is not limited thereto. Absent.

It is sectional drawing of the internal structure of a battery module which shows 1st Embodiment of the battery module by this invention. Fig.2 (a) is a schematic diagram of arrangement | positioning of the battery module and flexible layer to the panel surface which shows 1st Embodiment of the battery module (aggregate | assembly) by this invention. FIG. 2B is a schematic diagram showing the center of gravity point, vertex, midpoint, center line, and diagonal line of the panel, and is common to all the embodiments. It is a model layout view of the battery module and the flexible layer on the panel surface, showing the second embodiment of the battery module according to the present invention. FIG. 6 is a schematic layout view of a battery module and a flexible layer on a panel surface, showing a third embodiment of the battery module according to the present invention. FIG. 6 is a schematic layout view of a battery module and a flexible layer on a panel surface, showing a fourth embodiment of the battery module (an assembly thereof) according to the present invention. FIG. 9 is a schematic layout diagram of a battery module and a flexible layer on a panel surface, showing a fifth embodiment of (an assembly of) the battery module according to the present invention. FIG. 10 is a schematic layout diagram of a battery module and a flexible layer on a panel surface, showing a sixth embodiment of (an assembly of) battery modules according to the present invention. FIG. 10 is a schematic layout diagram of a battery module and a flexible layer on a panel surface, showing a seventh embodiment of (an assembly of) the battery module according to the present invention. It is a model layout view of the battery module and the flexible layer on the panel surface, showing an eighth embodiment of the battery module (an assembly thereof) according to the present invention. It is a model layout view of the battery module and the flexible layer on the panel surface, showing a ninth embodiment of the battery module (an assembly thereof) according to the present invention. It is a model layout view of the battery module and the flexible layer on the panel surface, showing a tenth embodiment of the battery module (an assembly thereof) according to the present invention. It is a model layout figure of the battery module and flexible layer to the panel surface which shows 11th Embodiment of the battery module (aggregate | assembly) by this invention. It is the enlarged view of the battery module 1a shown in the left side of FIG. 2 in 1st and 11th embodiment of the battery module (aggregate | assembly) by this invention. FIG. 14 is a cross-sectional view taken along arrow A-A ′ of FIG. 13 in the first embodiment of the battery module according to the present invention. In the eleventh embodiment of (an assembly of) battery modules according to the present invention, AA in FIG. 13 when the flexible layer of the battery module having the internal structure in FIG. 12 is formed in the shape shown in FIG. 'Cross section B arrow view.

Explanation of symbols

1, 1a, 1b, 1c battery module,
2 single battery cells,
3 cell fixing structure,
4 Current collector (conductor),
5 Terminal extraction part,
6 Module electrode terminals,
7 Flexible layer,
8 Mounting surface (mounting part) to the car body structure
9 panels,
10 potting material,
11 Battery module outer case,
12 Battery module cover,
13 Potting material inlet,
14 Mounting bolt hole position,
15 mounting bolt holes,
G Center of the panel (center of gravity),
_{C 1, C 2, C 3} , C 4 panels vertex.

Claims (10)

A battery module installed on a substantially planar panel constituting a vehicle,
It is installed on the vehicle body via a flexible layer that is integrated with the exterior case ,
When installing a plurality of battery modules on one panel, at least three battery modules are installed in the representative length direction of the panel, and a flexible layer is arranged in a straight line passing through the center of gravity of the panel. Aggregation. The battery module according to claim 1,
An assembly of battery modules, wherein a plurality of battery modules are installed on one panel having a substantially planar shape. The battery module according to claim 1 or 2 ,
The battery module in the center of the panel has a flexible layer in one letter,
Panel battery module in the periphery of a collection of cell modules, characterized in placing a flexible layer radially toward the apex of the panel. The battery module according to claim 3 , wherein
Panel battery module in the periphery of a collection of cell modules, characterized in placing a flexible layer along the center line of the battery module together with placing a flexible layer radially toward the apex of the panel. A battery module according to claim 3 to 4,
Panel battery module in the middle portion of a collection of cell modules, characterized in placing a flexible layer crosswise. In the battery module according to any one of claims 3 to 5 ,
The battery module in the center of the panel has a flexible layer in a cross shape, and the battery module in the periphery of the panel has a flexible layer in a radial pattern toward the top of the panel and along the center line of the battery module. assembly of the battery module, characterized by placing a flexible layer Te. The battery module according to claim 1 or 2 ,
The battery module in the center of the panel has a flexible layer in one letter,
Panel battery module in the periphery of a collection of cell modules, characterized in placing a flexible layer diagonally of the battery module. The battery module according to claim 7 ,
Panel battery module in the periphery of a collection of cell modules, characterized in placing a flexible layer along the center line of the battery module together with placing a flexible layer diagonally of the battery module. The battery module according to any one of claims 7 to 8,
Panel battery module in the middle portion of a collection of cell modules, characterized in placing a flexible layer crosswise. The battery module according to any one of claims 7 to 9 ,
The battery module in the center of the panel has a flexible layer in the cross shape, and the battery module in the periphery of the panel has a flexible layer in the diagonal of the battery module and is flexible along the center line of the battery module. assembly of the battery module, which comprises disposing a layer.

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