JP2003142052A - Secondary battery module and secondary battery module assembly - Google Patents

Secondary battery module and secondary battery module assembly

Info

Publication number
JP2003142052A
JP2003142052A JP2001339144A JP2001339144A JP2003142052A JP 2003142052 A JP2003142052 A JP 2003142052A JP 2001339144 A JP2001339144 A JP 2001339144A JP 2001339144 A JP2001339144 A JP 2001339144A JP 2003142052 A JP2003142052 A JP 2003142052A
Authority
JP
Japan
Prior art keywords
secondary battery
frame
battery module
pressing force
electrode material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2001339144A
Other languages
Japanese (ja)
Inventor
Mitsufumi Gotou
Hiroko Handa
Tsutomu Hashimoto
Katsuaki Inoue
Hidehiko Tajima
克明 井上
博子 半田
満文 後藤
勉 橋本
英彦 田島
Original Assignee
Mitsubishi Heavy Ind Ltd
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Ind Ltd, 三菱重工業株式会社 filed Critical Mitsubishi Heavy Ind Ltd
Priority to JP2001339144A priority Critical patent/JP2003142052A/en
Publication of JP2003142052A publication Critical patent/JP2003142052A/en
Pending legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

PROBLEM TO BE SOLVED: To provide an assembly of secondary battery modules capable of restraining contact resistance by energizing suitable elastic force to the respective battery modules integrally assembled to stop bulging of a battery container and by energizing predetermined pressure to a layered product of each electrode material to enhance contacting capability. SOLUTION: Respective pairs of engaging projections are formed on both left and right or upper and lower surfaces facing to each other of a nearly rectangular secondary module comprising an aggregation of secondary batteries composed by housing, in the rectangular battery container, an electrode body composed by interposing and laminating a separator between a plate-like positive electrode material and a plate-like negative electrode material and by sealing it along with an electrolyte. The engaging projections are fitted to engaging projections of another module, so that both the modules are fixed to each other by restraining their upper and lower and left and right positions by each other. More preferably, a flat space corresponding to the height of the engaging projections is formed between the two facing surfaces of the pair of the secondary battery modules fixed by the engaging projections and a pressing force energizing member is interlaid in the flat space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention integrally integrates a plurality of secondary batteries, such as a non-aqueous electrolyte secondary battery such as a lithium secondary battery, in which a positive electrode material and a negative electrode material are laminated and arranged with a separator interposed therebetween. The present invention relates to a rechargeable battery module and an assembly of rechargeable battery modules assembled with each other, and more particularly to a substantially rectangular rechargeable battery module and a reassembly of rechargeable battery modules.

[0002]

2. Description of the Related Art Conventionally, non-aqueous electrolyte secondary batteries such as lithium secondary batteries have various capacities and long lifespans as compared with conventional secondary batteries such as nickel hydrogen batteries. It is often used as a power source for portable electronic devices or electric devices.
For example, at present, laptop computers, laptop word processors, palmtop (pocket) computers, mobile phones, PHS, mobile faxes, mobile printers, headphone stereos, video cameras, mobile TVs, portable CDs, portable MDs, electric shavers. , Electronic handrails, transceivers, power tools, radios, tape recorders, digital cameras, mobile copiers, handheld game machines, and other mobile terminals, as well as electric vehicles, hybrid vehicles, vending machines, electric carts, power storage for load leveling. It is used in systems, more large-capacity home electric storage devices, distributed power storage systems (built into stationary appliances), and emergency power supply systems for hospitals and companies.

As described above, a positive electrode composed of a positive electrode active material, a positive electrode conductive material, a binder, and a positive electrode current collector used for various purposes, and a negative electrode active material, a binder, a negative electrode current collector, or further It is composed of an electrode body in which a separator is sandwiched between a negative electrode to which a negative electrode conductive material is added, an electrolytic solution, and a battery container having a terminal that seals the electrode body and the electrolytic solution and is connected to the electrode body. The electrode body may have a structure in which a positive electrode, a separator, and a negative electrode are stacked and the terminal portion is taken out from each electrode, or a structure in which flat plate-shaped strip-shaped electrodes are stacked. That is,
Any secondary battery may be used as long as it has an electrode body having a flat plate laminated structure in which a separator is inserted between the positive electrode and the negative electrode facing each other. Such an electrode body is divided into one that is wound and formed into a cylindrical shape, and one that is formed by stacking flat plate-shaped strips.

A lithium ion secondary battery having an electrode body of a flat plate laminated structure in which a separator is inserted between a positive electrode and a negative electrode, which are opposed to each other, applied to the present invention is, for example, FIG. 1, FIG. 2 and FIG.
As shown in the internal structure, a plate-shaped positive electrode material composed of a positive electrode active material, a positive electrode conductive material, a binder, and a positive electrode current collector, and a negative electrode active material, a binder, a negative electrode current collector, or further The electrode body is formed by sandwiching a plate-shaped separator between a plate-shaped negative electrode material to which a negative electrode conductive material is added and laminating it together with an electrolytic solution, and arranging a terminal portion outside the battery container.

The battery container is made of stainless steel whose inside is coated with insulation, or mild steel which is coated with a corrosion-resistant material. The separator is a polypropylene porous film, and the electrolyte is ethylene carbonate (E
An electrolytic solution in which LiPF6 is dissolved in a mixed solvent of C) and dimethyl carbonate (DMC) is used.

Since such a secondary battery has a charging voltage of about 4V, a battery module of 24V can be formed by connecting six of the batteries in series, or a serial module of 3/2 can be connected.
A rechargeable battery module having a current capacity twice that of the battery module at 12V is constructed. And the application load is 100V
In the case of 4, the above secondary batteries are connected in series, when 8 to 9 are used in an emergency power source such as a hospital of 200 to 220V, and about 12 in the case of an electric vehicle of around 350V. Need to

In the secondary battery module group, when the adjacent battery modules are connected in pairs, not only the connecting line becomes complicated but also the installation area becomes large. Therefore, it is preferable to assemble a plurality of modules by assembling them, but when charging and discharging the battery,
Since the container is repeatedly swelled and contracted due to the generation of gas by the reaction and the expansion of the negative electrode material, it is necessary to prevent the swelling to such an extent as to prevent the plastic deformation of the container. In addition, the inside of the battery container has a structure in which a positive electrode material, a negative electrode, and separators are alternately laminated between them, and in order to suppress an increase in internal resistance due to lamination, the laminated body is pressed with a predetermined pressure. Therefore, it is necessary to improve the contact property and keep the contact resistance low.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to integrally integrate a plurality of secondary battery modules including a secondary battery having a laminated electrode body in which a separator is inserted between a positive electrode and a negative electrode facing each other. An object is to provide an assembly of a rechargeable battery module that is assembled. Another object of the present invention is to apply a proper elastic force to each of the battery modules that are integrally assembled to prevent the battery container from bulging, and to apply a predetermined pressure to the electrode stack. An object of the present invention is to provide a rechargeable battery module assembly that enhances contactability and keeps contact resistance low.

[0009]

According to the first aspect of the present invention, an electrode body in which a separator is sandwiched between a plate-shaped positive electrode material and a plate-shaped negative electrode material is placed inside a substantially rectangular battery container with a separator interposed therebetween. A secondary battery module in which a plurality of substantially rectangular secondary batteries, which are formed by stacking a plurality of layers and sealing together with an electrolytic solution, are combined.
A pair of engaging protrusions is provided on each of the opposite left, right, and / or upper and lower surfaces of the substantially prismatic secondary battery module, and the engaging protrusions are fitted to the engaging protrusions of another module so that the upper and lower sides of both modules can be fitted together. And a left and right position regulation is performed and fixed, and a module assembly is proposed, more preferably, between the two facing surfaces of a pair of secondary battery modules fixed by engaging protrusions. Corresponding to the height of the compound protrusion,
The flat space is formed, and a pressing force urging member is interposed in the flat space.

According to this invention, the secondary battery modules can be assembled integrally by regulating the positions of the secondary battery modules vertically and vertically by the sliding fitting of the engaging projections, and the bow of the pressing force urging member. The shaped leaf springs apply elastic force to the flat space between the opposite sides of the module by the engaging protrusions of the module to apply appropriate elastic force to the battery modules that are integrally assembled from above and below. Thus, it is possible to prevent the battery container from bulging and to apply a predetermined pressure to the electrode laminate to enhance the contact property and suppress the contact resistance to a low level.

Further, by forming the engaging projections by combining the rectangular projections and the key-shaped projections, the rectangular projections are contact-fitted with each other, whereby the position of the module in the left-right direction (in-plane direction) is regulated, and the key-shaped projections are also provided. By the contact fitting of the protrusions, the positions of the module left and right (in-plane direction) and the vertical direction (plane separating direction) can be regulated, and fitting and fixing can be performed accurately. Further, by forming the pressing force urging member by a flat plate and a spring member that is bulged upward and downward at appropriate positions on the flat plate, elastic force can be uniformly urged to the opposing module surfaces. If the upper and lower leaf spring portions are not provided at the same position but are alternately provided adjacent to each other on the left and right sides, a flat leaf spring member can be formed by a single press molding.

Further, according to the present invention, the terminal plate connected to the internal electrode is exposed at the portion of the both sides of the battery module that contacts the pressing force urging member by the engaging protrusions, and the terminal plate is pushed. , The flat plate is an insulating member, the spring member is made of a material having good conductivity, and the + and-terminals provided on the bottom surface and the top surface of the battery module. It can be connected to a board.

According to this structure, an independent terminal connecting portion is not necessary, and the terminal portions are fitted by engaging protrusions on both left and right sides of the module without being projected and exposed. It is extremely safe because the electrical connections are located in the closed flat space of the.

According to the second aspect of the present invention, the inside of the rectangular battery container is
A plate-shaped positive electrode material, a plate-shaped negative electrode material, a separator is sandwiched between the electrode bodies are arranged, a secondary battery module group in which a plurality of substantially rectangular secondary batteries formed by sealing together with an electrolytic solution are combined, and A frame member for fixing a position of the battery group in a state in which a plurality of batteries are vertically stacked or arranged side by side, and the frame frame is a divided frame member, and the battery group is positioned. It is characterized in that it is a frame frame that is integrated by tightening screws or pins when fixing, and preferably, a biasing frame member for biasing the pressing force to the battery group has the divided frame member interposed therebetween. Characterize.

In this case, preferably, even if the pressing force urging member is arranged on the side of the frame frame facing the battery group, the frame frame itself can be elastically deformed by the tightening force of the tightening screw. Alternatively, both may be combined.

The present invention uses, for example, a plastic frame for fixing the batteries to each other, instead of the engaging projections as in the first invention. Then, the prismatic lithium secondary batteries are tightly attached to each other on the left and right sides or the top and bottom sides, and are bent and surrounded by a divided rectangular frame-shaped plastic frame to fix the left and right sides and top and bottom. Further, it is configured to be tightened in the stacking direction (vertical direction) of the electrode body housed in the battery container by the pressing force urging frame member interposed at an intermediate position of the divided frame frame.

According to this invention, the horizontally arranged secondary batteries can be integrally fixed to each other by fixing the metal pins or screws of the plastic frame, and the bow-shaped leaf spring of the pressing force energizing frame member can be fixed. However, the elastic force is applied between the left and right sides of the module, and the frame body of the frame is elastically deformed by the tightening force of the metal pin or the screw shaft, and the proper elasticity is applied to the integrally fixed batteries from the upper, lower, left and right sides. A force can be applied to prevent the battery container from swelling, and a predetermined pressure can be applied to the electrode laminate to improve the contact property and keep the contact resistance low.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, unless otherwise specified, the dimensions, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples.

FIG. 1 is a sectional view showing an assembly structure of a secondary battery module according to the first embodiment of the present invention, FIG. 3 is a perspective view showing a battery module used in FIG. 1, and FIG. 4 is shown in FIG. It is a perspective view which shows the pressing force biasing body used. In FIG. 1, a lithium ion secondary battery module 1A, 1B according to an embodiment of the present invention has a configuration in which a plurality of rectangular secondary batteries 2 are incorporated, specifically, in a container of the secondary battery 2, A rectangular plate-shaped positive electrode material 3A composed of a positive electrode active material, a positive electrode conductive material, a binder, and a positive electrode current collector, and a negative electrode active material, a binder, a negative electrode current collector, or a negative electrode conductive material was added. A rectangular plate (membrane) separator 3C is sandwiched between a rectangular plate negative electrode material 3B and an electrode body 3 which is laminated in the horizontal direction, and four secondary batteries 2 in which an electrolytic solution is sealed are housed in a module. To be done.

On both upper and lower surfaces of the prismatic lithium secondary battery module 1A, a pair of engaging projections 10A composed of key-shaped projections 11A, 11B and vertical projections 12A, 12B,
10B is provided, and the engagement protrusion 10 of another battery module 1B is provided.
B and 10A are engaged with each other so that they can be integrally engaged and assembled.

That is, as shown in FIG. 3, the engaging projection 10B located on the lower surface side extends vertically downward along the left and right side surfaces, and the vertical projection 12B therein has a rectangular cross section. On the other hand, the key-shaped projection 11B is formed by bending the key-shaped projection 11B inwardly into an L shape. Further, the engagement protrusion 10A located on the upper surface side is
By the thickness of the lower surface side engaging projections 10B on the left and right side surfaces,
It extends vertically upward from the position shifted inward, and the vertical projection 12A therein has a rectangular cross section, while the key-shaped projection 1
1A is formed by bending it toward the outside in an L shape.

As a result, the engaging protrusion 10B on the lower surface of one battery module 1A is slid so as to be fitted to the engaging protrusion 10A at a position where the engaging protrusion 10B contacts the upper surface of the other battery module 1B. Engagement protrusions Engagement protrusions 10A, 10B fit tightly, vertical protrusions 12A, 1
On the 2B side, the left and right position restrictions are key-shaped protrusions 11A and 11B.
On the side, the top and bottom and left and right positions are regulated and they are firmly fixed. At this time, the battery modules 1A, 1
Between the bottom surface and the top surface of B, the space 13 having a square shape is formed by the height of the engaging protrusions 10A and 10B.
Swelling of the battery container 2 of the battery modules 1A and 1B is allowed at that portion. Therefore, a leaf spring-shaped pressing force urging member 15 shown in FIG. 4 is interposed in the flat space 13 between the battery modules 1A and 1B. The pressing force urging member 15 includes a flat plate 16 made of a metal or a resin plate and a battery module 1A, 1B.
Three strip-shaped spaces 16a in the insertion direction of the flat space 13 between
c is punched out, and the leaf spring members 17 formed in an upper and lower bow shape are respectively fixed to the strip-shaped spaces 16a to 16c. In this case, if the upper and lower bow-shaped leaf spring members 17 are not provided at the same position but are alternately provided adjacent to each other on the left and right,
The flat leaf spring member 17 can be formed in one shot by press molding. In this case, it is difficult to generate the equalizing pressing force unless the numbers are set to be the same at the top and bottom.

The pressing force urging member 15 is provided on the battery module 1 during the slide fitting operation of the battery modules 1A and 1B on the upper and lower sides or after the slide fitting.
A, 1B are loaded into the flat space 13 between the upper and lower surfaces. As a result, the secondary battery modules 1A and 1B can be assembled in an integrated manner with the positions of the secondary battery modules 1A and 1B regulated vertically and horizontally by the sliding fitting of the engagement protrusions 10A and 10B.
The bow-shaped leaf spring member 17 of the pressing force urging member 15 urges an elastic force to the flat space 13 between the upper and lower surfaces of the battery modules 1A, 1B to integrally assemble the battery modules 1.
It is possible to prevent the battery container from swelling by applying proper elastic forces to the upper and lower surfaces of A and 1B, and to apply a predetermined pressure to the electrode laminate to improve the contact property and keep the contact resistance low. I can.

FIG. 2 is a schematic sectional view showing the assembly structure of the secondary battery module according to the second embodiment of the present invention, in which the pressing force urging member 15 has a connection terminal function. FIG. 3 is FIG.
Perspective view showing the battery modules 1A, 1B used in
FIG. 5 is a perspective view showing the pressing force urging member 15A used in FIG. The same reference numerals indicate the same functional members. Now, in the embodiment shown in FIG. 1, an independent terminal connection must be provided. Therefore, in this embodiment, the pressing force urging member 15A is provided with a connection terminal function and an independent terminal connection portion is omitted. That is, the positive and negative terminal plates 0 are provided at the portions of the bottom surface and the upper surface of the battery modules 1A and 1B that are in contact with the right and left leaf spring portions 17A and 17C of the pressing force urging member 15A.
Expose 5. On the other hand, in the pressing force urging member 15A, the flat plate 16A is formed of an insulating resin plate, and the insulating flat plate 16A is formed.
Of the battery module 1A, 1B is formed by punching out three strip-shaped spaces 16a to 16c in the insertion direction of the flat space 13 between the battery modules 1A and 1B.
While fixing the leaf spring members 17A, 17B, 17C formed in the upper and lower bow shapes in the strip-shaped spaces 16a to 16c respectively,
The left and right leaf spring members 17A and 17C are made of a material having good conductivity, and are configured to be connectable to the + and-terminal plates 05 provided on the bottom and top surfaces of the battery modules 1A and 1B.

According to this structure, an independent terminal connecting portion is not necessary, and the engaging projection 1 is provided without exposing the terminal portions 5 on the left and right sides of the battery modules 1A and 1B.
0A, 10B are fitted together, and battery modules 1A, 1
It is extremely safe because the electrical connection parts 05, 17A and 17C are located in the closed flat space 13 between the bottom surface and the top surface of B.

FIG. 6 is a sectional view showing the assembly structure of the secondary battery module according to the third embodiment of the present invention.
A plastic frame 20 is used to fix the 1Ds. FIG. 7 is a perspective view of the plastic frame 20 and the pressing force urging frame member 25 used in this embodiment.
A lithium ion secondary battery 1C according to an embodiment of the present invention,
1D is an electrode in which a rectangular plate (membrane) separator 3C is sandwiched between a rectangular plate-shaped positive electrode material 3A and a rectangular plate-shaped negative electrode material 3B inside a vertically long rectangular battery container 2 and laminated on the left and right. A terminal part 5 in which a plurality of electrodes are laminated via a separator (membrane) 4 and an electrolytic solution is sealed, and the positive electrode material 3A and the negative electrode material 3B of the electrode body 3 are respectively arranged in series or in series parallel to the outside of the battery container 2. Is arranged. Then, the rectangular lithium secondary batteries 1C and 1D are surrounded and bent by a rectangular frame-shaped plastic frame 20 to fix the left, right, and top. Then, as shown in FIG. 7, a pressing force urging frame member 25 provided at an intermediate position of the plastic frame is tightened in the stacking direction (vertical direction) of the electrode body 3 housed in the battery container 2. Composed.

The plastic frame includes a top frame 21 in which projecting frames 28A are hung on the lower surfaces of the four corners of a rectangular frame having two parallel module support rods 26 in the middle, and a pair of H-shaped frames. Intermediate frames 23, 23, a lower frame 22 in which projecting frames 28B are hung vertically on the upper surfaces of the four corners of a rectangular frame having two parallel module support rods 27 in the middle, the upper frame 21, and the middle Frame 23
Between the intermediate frame 23 and the lower frame 22, each of which is composed of a pair of pressing force urging frames 25, 25, all of the frames 21 to 25 are located at positions corresponding to four corners. A pin hole 29 is inserted and all the frames 21 to 25 can be integrally fixed by four metal pins or screws 30.

Next, each frame member will be described. The upper frame 21 is a rectangular frame 2 having a rectangular rod-shaped frame member having two parallel module support rods 26 in the middle.
The projecting frame 28 </ b> A that forms 10 and is hung on the lower surfaces of the four corners of the rectangular frame is a pressing force urging frame 25.
The leaf spring 32 is set to an appropriate length for tightening the left and right sides of the batteries 1C, 1D. In addition, a pin hole 29 through which a metal pin or a screw penetrates is formed in the corner portion.

The intermediate frame 23 has an H-shaped frame formed of a frame member having a square rod-shaped cross section, and has pin holes 29 through which the metal pin screws 30 penetrate, on the left and right members. The lower frame 22 includes two module support bars 27 parallel to each other in the middle.
The rectangular frame 220 is formed by a frame member having a square bar-shaped cross section, and the two module support bars 27 of the rectangular frame 220 support the batteries 1C and 1D, and the four corners of the rectangular frame 220 are supported. A projecting frame 28B hung vertically on the upper surface
Is similar to the upper frame in that the leaf spring 32 of the lower pressing force urging frame 25 is set to an appropriate length for tightening the left and right surfaces of the batteries 1C, 1D, but its corners are the same. The pin hole 29 is formed by screwing the pin hole 29 into which the metal pin screw 30 is screwed.

The pressing force urging frame 25 is formed in a rectangular frame shape, which is softer than the resin material forming the upper and lower portions and the frames 21 and 22 and is elastically deformable by the tightening force of the metal pin screw 30. At the same time, an elastic member in the form of a leaf spring 32 is attached to the inner peripheral side thereof so that the spring force is biased in the stacking direction (vertical direction) of the electrode body 3 housed inside the battery container 2. The frame 21
The long side length of .about.25 is made slightly larger than the juxtaposed length of the two batteries 1C and 1D, and the leaf spring 32 can be tightened with an appropriate biasing force.

According to this embodiment, the two batteries 1C and 1D are first juxtaposed on the lower frame 22, and then the leaf spring 32 of the lower pushing force pushing frame 25 is used to move the pushing force pushing frame 25. Tighten the batteries 1C and 1D while fitting them. Next, the intermediate frames 23 are erected on the short sides of the lower pressing force urging frame 25, respectively, and the leaf springs 32 of the upper pressing force urging frame 25 are used on the intermediate frames 23 to stand upright. After being tightened while being fitted in the batteries 1C and 1D, the upper frame 21 is attached thereon. Finally, by inserting the metal pin screw 30 through the pin hole 29 of the upper frame 21, the pin screw hole 29 of the lower frame 22 is inserted.
While being screwed on, the elastic force of the frame body of the pressing force urging frame 25 is utilized to compress and tighten the frame 25.

According to this embodiment, by fixing the metal pin screw 30 of the plastic frame 20, the horizontally arranged secondary batteries 1C and 1D can be integrally fixed together, and the pressing force urging frame 25 The bow-shaped leaf spring 32 urges an elastic force between the left and right surfaces of the batteries 1C, 1D, and the tightening force of the metal pin or the screw 30 elastically deforms the frame body of the pressing force urging frame 25 to integrally form the above. Proper elastic force is applied to each of the fixed battery modules 1C, 1D from the upper, lower, left, and right sides to prevent the battery container 2 from swelling and a predetermined pressure is applied to the electrode stack 3 to enhance the contact property and to make contact. The resistance can be kept low.

In this embodiment, the electrode body incorporated in the secondary battery container was a laminated type of flat plate electrodes, but even if the electrode body is a wound type, the battery container has a substantially rectangular shape. If so, it is possible to tighten and fix the module battery as in the present embodiment.

Although FIGS. 1 to 3 show an example in which the modules are arranged in a line, the modules are arranged at 4 × 10, 2
The present invention also includes the case of arranging in a × 20 format (in the case of FIG. 1, another module is adjacent to the left and right sides, and protrusions are also connected to the left and right sides).

[0035]

As described above, according to the first aspect of the present invention,
The secondary protrusions of the battery module can be integrally assembled by regulating the positions of the secondary battery modules vertically and horizontally by the sliding fitting of the engaging protrusions. The engaging projections apply an elastic force to the flat space between the opposite surfaces of the modules, and apply an appropriate elastic force to the battery modules that are integrally assembled from the upper and lower surfaces to expand the battery container. The contact resistance can be suppressed to a low level by preventing the discharge and enhancing the contact property by applying a predetermined pressure to the electrode laminate.

Further, since the engaging projections are formed by combining the rectangular projections and the key-shaped projections, the rectangular projections are contact-fitted with each other so that the position of the battery module in the left-right direction (in-plane direction) is regulated. By contact-fitting the mold-like projections with each other, the positions of the module in the left-right direction (in-plane direction) and in the up-down direction (plane-separating direction) can be regulated, and fitting and fixing can be performed accurately. Further, by forming the pressing force urging member and the flat plate and the spring member bulging upward and downward at appropriate positions on the flat plate, the elastic force can be uniformly urged to the opposing battery module surfaces.

By constructing the present invention as described in claim 5, an independent terminal connecting portion is not necessary, and the terminal portion of the module is fitted by the engaging projection without projecting and exposing. It is extremely safe because the electrical connections are located in a closed flat space between the bottom and top of the battery module.

Further, according to the second aspect of the present invention, the secondary battery modules which are horizontally juxtaposed can be integrally fixed by fixing the metal pins or screws of the plastic frame, and the pressing force urging frame frame is also provided. The bow-shaped leaf spring urges the elastic force between the right and left sides of the module, and the frame body of the pressing force urging frame is elastically deformable by the tightening force of the metal pin or the screw shaft, and the above-mentioned integrated Appropriate elastic force is applied to each fixed battery module from the upper, lower, left, and right sides to keep the bulging of the battery container within the elastic deformation and prevent plastically bulging and apply a predetermined pressure to the electrode stack. The contact resistance can be improved and the contact resistance can be kept low.

[Brief description of drawings]

FIG. 1 is a sectional view showing an assembly structure of a secondary battery module according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing an assembly structure of a secondary battery module according to a second embodiment of the present invention, in which a pressing force urging body has a connection terminal function.

FIG. 3 is a perspective view showing a battery module used in FIGS. 1 and 2.

FIG. 4 is a perspective view showing a pressing force urging body used in FIG.

5 is a perspective view showing a pressing force urging body used in FIG. 2. FIG.

FIG. 6 is a sectional view showing an assembly structure of a secondary battery module according to a third embodiment of the present invention, in which a plastic frame is used to fix the battery module.

7 is a perspective view of the plastic frame and the pressing force urging body of FIG. 6. FIG.

[Explanation of symbols]

1A, 1B, 1C, 1D secondary battery module 2 Secondary battery 2a Battery container 3 electrode body 3A plate-shaped positive electrode material 3B Plate negative electrode material 3C, 4 separator 10A, 10B Engagement protrusion 11A, 11B key-shaped protrusion 12A, 12B Vertical protrusion 13 Flat space 15 Pressing force urging member 17, 17A, 17B, 17C Leaf spring member 5,05 terminal part 20 plastic frame 21 Upper frame 22 Lower frame 23 Middle frame 25 Pressing force urging frame member 30 metal pin screws 32 leaf spring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsufumi Goto             5-717-1, Fukahori-cho, Nagasaki-shi Mitsubishi Heavy Industries             Business Nagasaki Institute (72) Inventor Tsutomu Hashimoto             5-717-1, Fukahori-cho, Nagasaki-shi Mitsubishi Heavy Industries             Business Nagasaki Institute (72) Inventor Hidehiko Tajima             1-1 Nagano-shi Atsunoura-cho Mitsubishi Heavy Industries Ltd.             Company Nagasaki Shipyard F-term (reference) 5H022 AA19 BB03 CC09 EE09                 5H040 AA14 AA19 AS01 AS04 AT06                       AY06 CC15 CC25 CC26 DD04                       DD13 DD23 JJ03 LL01

Claims (8)

[Claims]
1. A plurality of electrode bodies in which a separator is sandwiched between a plate-shaped positive electrode material and a plate-shaped negative electrode material are arranged inside a substantially rectangular battery container with a separator interposed therebetween and sealed together with an electrolytic solution. A secondary battery module in which a plurality of substantially rectangular secondary batteries are combined, and a pair of engaging protrusions is provided on each of right and left and / or upper and lower surfaces of the substantially rectangular secondary battery module, the engaging protrusions having a pair of engaging protrusions. A secondary battery module assembly, wherein the protrusion is fitted to an engaging protrusion of another module, and the upper and lower and left and right positions of both modules are regulated and fixed.
2. The secondary battery module assembly according to claim 1, wherein the engagement protrusion is a combination of a rectangular protrusion and a key-shaped protrusion.
3. A flat space corresponding to the height of the engaging projection is formed between two facing surfaces of the pair of secondary battery modules fixed by the engaging projection, and the flat space is pushed into the flat space. The secondary battery module assembly according to claim 1, wherein a pressure urging member is interposed.
4. The secondary battery module assembly according to claim 3, wherein the pressing force urging member is a flat plate and a spring member that is bulged upward and downward at appropriate positions of the flat plate.
5. A terminal plate connected to an internal electrode is exposed at a portion of the opposite sides of the battery module that contacts the pressing force urging member by the engaging projections, and the terminal plate faces the pressing force urging member. The secondary battery module assembly according to claim 3, wherein the secondary battery module assembly is configured so as to be capable of contacting a terminal connecting portion provided at a position.
6. A substantially rectangular battery obtained by arranging a laminated positive electrode material and a negative electrode material with a separator sandwiched between a plate-shaped positive electrode material and a plate-shaped negative electrode material inside a battery container having a substantially rectangular shape, and hermetically sealing together with an electrolytic solution. A divided frame member having a secondary battery and a frame frame for fixing the battery group in a position in which a plurality of the batteries are vertically stacked or arranged side by side, wherein the frame frame is divided, A secondary battery module, which is a frame frame that is integrated by tightening screws when fixing the position of the battery group.
7. The secondary battery module according to claim 6, wherein an urging frame member for urging a pressing force to the battery group is interposed between the divided frame members.
8. A structure in which a pressing force urging member is disposed on a side of the urging frame frame facing the battery, or a structure in which the urging frame frame itself is elastically deformable by a tightening force by a tightening screw, Alternatively, the secondary battery module according to claim 6, which is configured by combining both.
JP2001339144A 2001-11-05 2001-11-05 Secondary battery module and secondary battery module assembly Pending JP2003142052A (en)

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