WO2006059421A1

WO2006059421A1 - Electric device aggregation

Info

Publication number: WO2006059421A1
Application number: PCT/JP2005/016714
Authority: WO
Inventors: Hisako Nakano
Original assignee: Nec Corporation; Fuji Jukogyo Kabushiki Kaisha
Priority date: 2004-11-30
Filing date: 2005-09-12
Publication date: 2006-06-08
Also published as: JP2012146681A; JPWO2006059421A1; JP5296989B2

Abstract

An electric device aggregation where vibration of a body case and vibration of film-covered electric devices received in the body case are less likely to resonate. Rechargeable film-covered cells are individually received in a cell case (20), and cell modules (30) in each of which two or more cell cases (20) are packed are received in a body case (51). A lower rubber sheet (56) is placed between a lower case (52) and the cell modules (30), and an upper rubber sheet (57) is placed between a case (53) and the cell modules (30).

Description

Specification

Electrical device assembly

Technical field

[0001] The present invention relates to an electric device assembly in which a plurality of film-covered electric devices in which chargeable / dischargeable electric device elements are covered with a film are accommodated in a case.

Background art

[0002] In recent years, the development of electric vehicles and hybrid electric vehicles (hereinafter simply referred to as “electric vehicles”) that use electric motors as the drive source has been rapidly progressing! / The power source of the electric motor mounted on the electric vehicle is required to be small and light in order to improve the driving characteristics of the electric vehicle and the mileage after one charge. In order to realize a power supply that meets the strong demands, a film-clad battery disclosed in Japanese Patent Application Laid-Open No. 2001-76691 has been developed. In addition, a battery pack (sometimes referred to as an “assembled battery”) in which a large number of the film-clad batteries are accommodated in a case so as to obtain a desired output voltage has been developed! FIG. 7 shows the basic structure of a film-clad battery disclosed in Japanese Patent Laid-Open No. 2001-76691. In this film-clad battery 100, a power generation element 101 composed of a positive electrode side active electrode, a negative electrode side active electrode, and an electrolytic solution is covered with a laminate film 102. The laminate film 102 is a film in which a metal film such as aluminum and a heat-sealable resin film are laminated. Four opposite sides of the two laminated films 102 covering the power generation element 101 are welded in an airtight manner. Also, a film-like positive electrode terminal 103 is drawn out from one short side of the laminated film 102 that is welded, and a film-like negative electrode terminal 104 is drawn out from the other short side.

Disclosure of the invention

[0003] There are the following problems in mounting a battery node in which a large number of film-clad batteries having the basic structure shown in FIG. 7 are accommodated in a case on a moving body such as an electric vehicle. In other words, the vibration generated during the movement of the moving body may cause a shift in the position of the film-clad battery in the case, or a crack may occur in the exterior of the film-clad battery. In particular, electric During running of a moving vehicle, vibrations of 100Hz or less are continuously generated. If this frequency and the natural frequency of the film-clad battery match (resonate), a very large impact is applied to the film-clad battery compared to when it is not resonant, so the above problem is likely to occur.

[0004] An object of the present invention is to provide an electric device assembly having a structure in which vibration of a case and vibration of a film-clad electric device housed in the case hardly resonate.

[0005] The present invention is characterized in that an elastic body is interposed between the film-clad electrical device and the case in which the film-clad electrical device is accommodated. This elastic body attenuates vibrations transmitted to the film-clad electrical device and prevents resonance between the case and the film-clad electrical device.

[0006] One of the film-clad electrical devices of the present invention is a plurality of film-clad electrical devices in which chargeable / dischargeable electrical device elements are covered with a film, and the plurality of film-clad electrical devices are individually accommodated. A plurality of cell cases; a main body case in which the plurality of cell cases are stacked and accommodated; and an elastic body interposed between the cell case and the main body case.

[0007] Another one of the film-clad electrical devices of the present invention includes a plurality of film-clad electrical devices in which chargeable / dischargeable electrical device elements are coated with a film, and the plurality of film-clad electrical devices individually. A plurality of stored cell cases, a plurality of cell cases stacked and stored, a plurality of module cases, a main body case storing the plurality of module cases, the module case, and the module case It has an elastic body interposed between the main body case.

[0008] A plurality of cell cases accommodated in the module case can be fixed by being sandwiched between a side plate and a cover plate of the module case. Furthermore, the fixing member can be passed through a plurality of cell cases accommodated in the module case so as to be integrated.

[0009] The film-clad electrical device includes a film-clad battery in which a power generation element having a positive electrode side active electrode, a negative electrode side active electrode, and an electrolytic solution is hermetically covered with two laminate films.

Brief Description of Drawings FIG. 1 is an external perspective view of a film-clad battery.

FIG. 2 is an exploded perspective view of a cased film battery.

FIG. 3 is an exploded perspective view of the battery module.

FIG. 4 is an exploded perspective view of the battery pack.

FIG. 5 is a perspective view of the battery pack with the upper case removed.

FIG. 6 is a cross-sectional view showing a fixing structure between the battery module and the main body case.

FIG. 7 is an external perspective view of a conventional film-clad battery.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an example of an embodiment of the electrical device assembly of the present invention will be described in detail.

In the electrical device assembly of this example, a plurality of battery modules each including a plurality of film-clad batteries (film-clad electrical devices) are accommodated in a case through an elastic body such as rubber resin. It is a battery pack.

A film-clad battery constituting the battery pack of this example will be described with reference to FIG. A film-clad battery 10 shown in FIG. 1 is a secondary battery in which a positive electrode side active electrode (not shown), a negative electrode side active electrode, and a power generation element 11 having an electrolyte solution are hermetically wrapped by two laminate films 12. . The output voltage of the film-clad battery 10 is about 3.6V. The laminate film 12 is a film in which a metal film such as aluminum and a heat-sealable resin film are laminated. The opposite four sides of the two laminated films 12 covering the power generation element 11 are hermetically welded.

[0013] Power generation elements of the film-clad battery include a laminated type and a wound type. In a stacked power generation element, independent positive electrode side active electrodes and negative electrode side active electrodes are stacked via a separator. On the other hand, in a wound-type power generation element, a strip-like positive electrode side active electrode and negative electrode side active electrode laminated via a separator are wound and compressed into a flat shape. However, the stacked type and the wound type are the same in that the positive electrode side active electrode and the negative electrode side active electrode are alternately stacked. The power generation element 11 of the film-covered battery 10 shown in FIG. 1 may be a stacked type or a wound type! Furthermore, a positive electrode plate and a negative electrode plate which are used in general lithium ion secondary batteries can be used for the positive electrode side active electrode and the negative electrode side active electrode. A common positive electrode plate is a lithium 'manganese complex oxide or lithium cobalt oxide on both sides such as aluminum foil. A positive electrode active material such as a chrome is applied. A general negative electrode plate is coated with a carbon material capable of doping and undoping lithium on both sides of a copper foil or the like. Therefore, the power generation element 11 shown in FIG. 1 can be obtained by impregnating the general positive electrode plate and negative electrode plate opposed to each other with the separator interposed therebetween with an electrolyte containing a lithium salt. However, the power generation element 11 is not limited to a specific power generation element, and may be any power generation element as long as it includes a positive electrode, a negative electrode, and an electrolyte. For example, any power generation element used in a normal battery can be used as it is or with a suitable design change.

[0014] Referring again to FIG. A positive electrode terminal 13 connected to the positive electrode side active electrode is drawn from one short side of the film-clad battery 10, and a negative electrode terminal connected to the negative electrode side active electrode is drawn from the other short side. 14 is drawn. The materials of the positive electrode terminal 13 and the negative electrode 14 are selected in consideration of electrical characteristics. In the film-clad battery 10 shown in FIG. 1, aluminum is used for the positive electrode terminal 13 and copper or nickel is used for the negative electrode terminal 14.

In the battery pack of this example, one film-cased battery 10 having the above structure is accommodated in one cell case 20. Furthermore, a predetermined number of film-clad batteries 10 (hereinafter referred to as “cased film batteries 21”) housed in the cell case 20 are integrated together to form a battery module 30. Therefore, the structure of the cell case 20 is shown in FIG. 2, and the structure of the battery module 30 is shown in FIG.

As shown in FIG. 2, the cell case 20 includes a case main body 21 and a frame body 22. The case body 21 has a frame-shaped bottom plate 23 and side walls 24 raised from the periphery of the bottom plate 23. The side wall 24 has a shape and a dimension capable of accommodating the film-clad battery 10 shown in FIG. On the other hand, the frame body 22 has a shape and dimensions that can be fitted inside the side wall 24 of the case body 21. When the frame 22 is placed on the film-clad battery 10 accommodated in the case body 21, the peripheral force of the film-clad battery 10 is sandwiched between the bottom plate 23 of the body case 21 and the frame 22. Seven through holes 25 are formed in the bottom plate 23 of the case body 21. These through holes 25 are formed at positions so as not to overlap the film-covered battery 10 housed in the case main body 21 and the frame body 22 covered on the film-covered battery 10. In other words, the opening position of the through hole 25 is the position of the film battery 21 with case. Designed to communicate with the back side. Note that the positive electrode terminal 13 and the negative electrode terminal 14 of the film-clad battery 10 accommodated in the cell case 20 are provided on the short side of the case body 21 and are provided outside the cell case 20 through the two notches 26. Each bow I was kicked out!

Next, the battery module 30 will be described. As shown in FIG. 3, the battery module 30 includes a plurality of cased film batteries 21 accommodated in a module case, and the plurality of cased film batteries 21 accommodated therein are integrated. The module case includes a resin holding member 31 and a cover plate 32. Twelve cased film batteries 21 are accommodated in the module case.

[0018] The module case holding member 31 includes a side plate 33 and an arm 34 projecting toward the cover plate 32 at four corner forces of the side plate 33. Furthermore, substantially L-shaped guide grooves 35 in which the four corners of the case-equipped film battery 21 (cell case 20) and the cover plate 32 can be respectively fitted are formed inside each arm 34 along the longitudinal direction. . The twelve case-cased film batteries 21 are accommodated inside the four arms 34 according to the guide of the guide groove 35 and are stacked in the thickness direction of the cell case 20.

The cover plate 32 is fitted inside the four arms 34 according to the guidance of the guide groove 35 after the twelve case-cased film batteries 21 are accommodated inside the arms 34. The fitted cover plate 32 comes into contact with the case-cased film battery 21a closest to the stacking direction. Here, the length of the arm 34 is longer than the total thickness of the twelve case-cased film batteries 21 by the thickness of the cover plate 32. Therefore, the surface of the cover plate 32 fitted inside the arm 34 after the twelve case-cased film batteries 21 and the end face of the arm 34 are flush with each other. A number of ribs are formed on the surfaces of the side plate 33 and the arm 34 for reinforcement.

[0020] The side plate 33 of the holding member 31 is formed with a plurality of rod insertion holes 36 communicating with the through holes 25 (refer to FIG. 2 for details) provided in each cell case 20. The lid plate 32 also has a plurality of bolt insertion holes 37 communicating with the through holes 25. Then, the rod 38 as a fixing member inserted from the mouth insertion hole 36 of the holding member 31 passes through all the cased film batteries 21 and reaches the bolt insertion hole 37 of the cover plate 32. The rod 38 is elongated and hollow, and a screw (not shown) is formed on the inner peripheral surface thereof. Bolt insertion hole 37 reached rod 37 One end of 8 is screwed with a bolt 39 inserted into the bolt insertion hole 37 with a force opposite to that of the rod 38. That is, the holding member 31, the twelve cased film batteries 21 and the lid plate 32 are integrated (modulated) by the seven rods 38 penetrating them.

A rectangular head 40 is formed at the other end of the rod 38, and a rectangular recess (not shown) into which the head 40 can be fitted is formed at the periphery of the rod insertion hole 36. By fitting the head portion 40 of the rod 38 into the recess, the rod 38 is prevented from rotating together when the bolt 39 is screwed to one end of the rod 38. The depth of the recess is set to be equal to or greater than the thickness of the head 40 so that the head 40 fitted in the recess does not protrude the surface force of the side plate 33. Also, the head 41 of the bolt 39 is fitted to the periphery of the bolt insertion hole 37 of the cover plate 32 so that the head 41 of the bolt 39 screwed to the rod 38 does not protrude from the surface of the cover plate 32. Possible recesses are formed

[0022] The inner diameter of the bolt insertion hole 37 is smaller than the outer diameter of the rod 38. Therefore, the tip of the rod 38 penetrating the cased film battery 21 a in contact with the cover plate 32 is not inserted into the bolt insertion hole 37. This means that the distance between the side plate 33 and the cover plate 32 of the holding member 31 sandwiching the plurality of cased film batteries 21 can be defined by the length of the rod 38. Furthermore, since the metal rod 38 has higher dimensional accuracy than the holding member 31 and the lid plate 32 made of resin, it is possible to define the distance between the side plate 33 and the lid plate 32 more accurately. means. In addition, the fact that the distance between the side plate 33 and the cover plate 32 is accurately defined means that the plurality of cased film batteries 21 therebetween are pressed in the stacking direction by a uniform pressure.

[0023] The twelve case-cased film batteries 21 modularized as described above are connected in series via a nose bar 42 spanned between the upper and lower arms 34. Therefore, the output voltage of one battery module 30 is about 43V. However, the number of cased film batteries 21 constituting each battery module 30 is not limited to twelve. However, humans are said to be able to escape instant death due to electric shock if it is 50 V or less. From the viewpoint of safety, the number that the output voltage is 50 V or less is desirable.

As shown in FIGS. 4 and 5, in the battery pack 50 of the present example, eight battery modules 30 shown in FIG. 3 are accommodated in the main body case 51. The main body case 51 is equipped with a battery module 30. A lower case 52 to be mounted, an upper case 53 that covers the battery module 30 mounted on the lower case 52, and a case lid 54 that closes one opening in the longitudinal direction of the upper case 53 are configured. The other opening in the longitudinal direction of the upper case is closed by a relay box 55. In other words, the eight battery modules 30 are accommodated in the main body case 51 in a state of being arranged in a line between the lid plate 54 and the relay box 55. The relay box 55 contains a fuse, a relay, a current sensor, and the like. In FIG. 4, the upper case 53, the cover plate 54, and the relay box 55 are not shown for convenience.

Further, as shown most clearly in FIG. 4, a pair of lower rubber sheets 56 are provided between the bottom surface of the battery module 30 and the lower case 52 so that the upper surface of the battery module 30 and the upper cover 53 ( A pair of upper rubber sheets 57 are respectively disposed between them (not shown). More specifically, between the bottom surface of the battery module 30 and the lower case 52, two lower rubber sheets 56 are arranged in parallel at predetermined intervals along the arrangement direction of the battery modules 30, The The lower rubber sheet 56 is in close contact with the bottom surface of the battery module 30 and the lower case 52. On the other hand, between the upper surface of the battery module 30 and the upper case 53, two upper rubber sheets 57 that are elongated along the arrangement direction of the battery module 30 are arranged in parallel at a predetermined interval. The upper rubber sheet 57 is in close contact with the upper surface of the battery module 30 and the upper case 53.

[0026] The eight battery modules 30 housed in the main body case 51 in the above-described state have a number of stages that penetrate the lower case 52 and the lower rubber sheet 56 or the upper case 53 and the upper rubber sheet 57. It is fixed to the main body case 51 with the attached bolt 60. The stepped bolt 60 has a head portion on which a flange 64 is formed, a shaft portion 65, and a tip portion thinner than the shaft portion 65. A screw 62 is formed on the outer peripheral surface of the tip of the stepped bolt 60. The fixing structure of the main body case 51 and the battery module 30 by the stepped bolt 60 is substantially common to all the stepped bolts 60. Therefore, FIG. 6 shows a structure for fixing the battery module 30 and the main body case 51 with any one stepped bolt 60.

FIG. 6 shows a fixing structure between the upper case 53 and any one battery module 30. The shaft portion 65 of the stepped bolt 60 inserted from the hole 61 provided in the upper case 53 passes through the upper rubber sheet 57. Furthermore, the stepped bolt 6 formed at the tip of the shaft 65 The zero screw 62 is screwed into a bolt hole 63 formed on the upper surface of the battery module 30. On the other hand, the flange 64 formed on the head of the stepped bolt 60 is in close contact with the periphery of the hole 61 of the upper case 53. That is, the upper rubber sheet 57 has a force that restricts movement in the vertical direction by the upper case 53 and the battery module 30 and is restricted in movement in the horizontal direction by the stepped bolt 60. It is not fixed directly to module 30 either.

In the battery pack 50 of this example, when the main body case 51 vibrates, the vibration is attenuated by the upper and lower rubber sheets 56 and 57. Therefore, if the natural frequency of the battery module 30 is set to be greater than or equal to the expected frequency of the main body case 51, it is almost certain that the frequency of the main body case 51 will match the natural frequency of the battery module 30. Can be avoided. Accordingly, resonance between the main body case 51 and the battery module 30 can be avoided almost certainly. For example, when the battery pack 50 is mounted on an electric vehicle, the main frequency of the expected main body case 51 is 100 Hz or less. Therefore, if the natural frequency of the battery module 30 is set to 100 Hz or more, resonance between the main body case 51 and the battery module 30 can be avoided almost certainly. Here, rubber hardness is one of the parameters that determine the amount of vibration attenuation by the upper and lower rubber sheets 56 and 57. This rubber hardness can be selected in consideration of the expected frequency of the main body case 51 and other conditions. In this example, hardness 60 (JIS

(Hs hardness) rubber sheet was used.

The battery pack 50 of the present example is fixed to a mounting surface (not shown) using a fixing bracket 70 (FIGS. 4 and 5) that protrudes from the long side of the lower case 52. At this time, the lower case 52 can be rigidly fixed to the mounting surface or can be fixed in a floating state. If it is difficult to attenuate the vibration frequency transmitted to the battery module 30 below the natural frequency of the battery module 30 with the upper and lower rubber sheets 56 and 57 alone, fixing in the floating state is desirable. The fixation in the floating state means a fixed state in which the mounting surface and the main body case 51 are fixed to each other through an elastic body such as rubber so that the vibration of the mounting surface is not directly transmitted to the main body case 51. To do.

[0030] The eight battery modules 30 integrated with the main body case 51 as described above are connected in series. It is connected. Specifically, the four battery modules 30 connected in series and the other four battery modules 30 connected in series are further connected in series via a safety plug in the power relay box 50. Therefore, the output voltage of the battery pack 50 is about 350V.

[0031] The plurality of film-clad batteries housed in the main body case 51 are not necessarily modularized. The case-cased film battery 21 shown in FIG. 2 can be directly accommodated in the main body case 51. When the case-equipped film battery 21 is directly accommodated in the main body case 51, a lower rubber sheet 56 is interposed between the bottom surface of the cell case 20 and the lower case 52, so that the upper surface of the cell case 20 and the upper case 53 are An upper rubber sheet 57 can be interposed therebetween.

So far, the embodiments of the present invention have been described taking the case where the film-clad electrical device is a film-clad battery as an example. However, the film-clad electrical device that constitutes the electrical device module or the electrical device module assembly of the present invention is not limited to a film external battery. For example, a film-covered electric device in which an electric device element (for example, a capacitor element typified by an electric double layer capacitor or an electrolytic capacitor) capable of accumulating electric energy is coated with an outer film is also included.

Industrial applicability

[0033] In the present invention, two or more cell cases in which the film-clad electrical devices are individually accommodated are accommodated in the main body case via the elastic body. Therefore, when the main body case vibrates, the vibration is attenuated by the elastic body and transmitted to the cell case. Therefore, if the natural frequency of the cell case is set to be greater than or equal to the expected frequency of the main body case, resonance between the main body case and the cell case can be avoided almost certainly.

Claims

The scope of the claims

[1] a plurality of film-covered electrical devices in which chargeable / dischargeable electrical device elements are covered by a film;

A plurality of cell cases in which the plurality of film-clad electrical devices are individually accommodated; and a body case in which the plurality of cell cases are laminated and accommodated;

An elastic body interposed between the cell case and the main body case;

An electrical device assembly having:

[2] a plurality of film-covered electrical devices in which chargeable / dischargeable electrical device elements are covered by a film;

A plurality of cell cases in which the plurality of film-clad electrical devices are individually accommodated; a plurality of module cases in which a predetermined number of the cell cases are stacked and accommodated;

A main body case containing the plurality of module cases;

An elastic body interposed between the module case and the main body case;

An electrical device assembly having:

[3] The module case includes a holding member provided with a side plate that contacts the cell case at one end in the stacking direction, and a cover plate that contacts the cell case at the other end in the stacking direction.

3. The electricity according to claim 2, wherein two or more fixing member forces inserted through an insertion hole provided in the holding member or the cover plate pass through a plurality of cell cases in the module case in the stacking direction. Device aggregate.

[4] The film-clad electrical device is a film external battery in which a power generation element having a positive electrode side active electrode, a negative electrode side active electrode, and an electrolytic solution is hermetically covered with two laminated films. Electrical device assembly.

5. The electricity according to claim 2, wherein the film-clad electrical device is a film-clad battery in which a power generation element having a positive electrode side active electrode, a negative electrode side active electrode, and an electrolytic solution is hermetically covered with two laminate films. Device aggregate.

[6] The film-clad electrical device has a positive electrode-side active electrode, a negative electrode-side active electrode, and a power generation element having an electrolyte solution, hermetically covered with two laminate films 4. The electric device assembly according to claim 3, wherein the electric device assembly is a battery.