CN201004477Y

CN201004477Y - High capacitance and small volume secondary battery

Info

Publication number: CN201004477Y
Application number: CNU2006201372375U
Authority: CN
Inventors: 詹益松; 何纶杰
Original assignee: Dongneng Science & Technology Co Ltd
Current assignee: Dongneng Science & Technology Co Ltd
Priority date: 2006-09-26
Filing date: 2006-09-26
Publication date: 2008-01-09
Anticipated expiration: 2016-09-26

Abstract

The utility model relates to a secondary battery with high capacity and small volume, which comprises a casing, a multi layer coiling body, two conduction poles and the electrolyte. The multi layer coiling body is formed by the coiling of an anode, a parting film, a cathode and another parting film in turns, and the multi layer coiling body has a front side and a back side parallel with each other. The anode comprises an aluminum sheet, and the top of the aluminum sheet forms a connecting area and an extending area connected together with multi piling. The cathode comprises a copper sheet, and the bottom of the copper sheet forms a connecting area and an extending area connected together with multi piling. The extending area of the aluminum sheet and the extending area of the cooper sheet are all upright with the front and back sides of the multi layer coiling body. Thereby, the secondary battery can reach the aim of reducing the volume on the basis of not affecting efficiency.

Description

The secondary cell that capacitance height and volume are little

Technical field

The utility model is relevant with battery, is meant the good secondary cell of the little usefulness of a kind of volume especially.

Background technology

Existing coiled secondary cell is to include a housing, one multiple layer scroll, two conductive electrode and electrolyte, this housing has an accommodation space and two perforation are communicated with this accommodation space and the external world, should multiple layer scroll be to be placed in the accommodation space of this housing, its structure sees also Fig. 1 and Fig. 2, should multiple layer scroll 10 be by a positive pole 12, one barrier film 14, stacking in regular turn then coiling of one negative pole 16 and another barrier film 14 forms, this positive pole 12 has an aluminium flake 121 and two anode material films 123, this aluminium flake 121 has a reaction zone 125, and one naked aluminium district 127 be connected with this reaction zone 125 with its base, before this two anode material film 123 is overlying on these aluminium flake 121 reaction zones 125, two surfaces, back, this negative pole 16 has a copper sheet 161 and two negative material films 163, this copper sheet 161 has a reaction zone 165, and one naked copper district 167 be connected with this reaction zone 165 with its top margin, before this two negative materials film 163 is overlying on these copper sheet 161 reaction zones 125, two surfaces, back, wherein, the shape of this aluminium flake 121 and this copper sheet 161 is complete rectangle, this anode material film 123 is to overlap with this negative material film 163, this two barrier film 14 is the relative positions that are positioned at this anode material film 123 and this negative material film 163, this two conductive electrode is two perforation that are arranged in this housing, the one conductive electrode is to be connected with the naked aluminium district 127 of this positive pole 12 in the mode that electrically connects each floor, another conductive electrode is to be connected with the naked copper district 167 of this negative pole 16 to electrically connect each floor mode, and this electrolyte is to be filled in the accommodation space of this housing.

Because this anode material film 123 is directly proportional with the capacitance of battery with the area size of this negative material film 163, therefore, for making battery possess certain capacitance, should must occupy certain space by multiple layer scroll, and should multiple floor scroll must be connected with two conductive electrode and be packaged in the housing with its naked aluminium district 127 and naked copper district 167, naked aluminium district 127 and naked copper district 167 also need occupy certain space, make battery have suitable volume; Yet, the taking electronic product is flourish in recent years, its stand-by time is more and more long, but volume is more and more little, the capacitance of existing secondary cell and the user demand that volume can't satisfy electronic product of new generation, therefore, how the structure at secondary cell improves, make it under the prerequisite that does not influence capacitance, to dwindle the battery volume as much as possible, become industry important topic extremely to be solved.

The utility model content

Main purpose of the present utility model is to provide a kind of secondary cell, can be issued to the purpose of volume-diminished in the prerequisite that does not influence capacitance.

Take off purpose for before reaching, secondary cell of the present utility model is to include a housing, one multiple layer scroll, two conductive electrode and electrolyte, this housing has an accommodation space, should multiple layer scroll be to be placed in the accommodation space of this housing, and by a positive pole, one barrier film, reel and form in the stacking in regular turn back of one negative pole and another barrier film, this is just having an aluminium flake and at least one anode material film, this aluminium flake has a reaction zone and covers thereon for this anode material film, one bonding pad is connected with this reaction zone with its base, and most extension areas are connected with this bonding pad with its base, this negative pole has a copper sheet and at least one negative material film, this copper sheet has a reaction zone and covers thereon for this negative material film, one bonding pad is connected with this reaction zone with its top margin, and most extension areas are connected with this bonding pad with its top margin, this anode material film is to overlap with this negative material film, this two barrier film is the relative position that is positioned at this anode material film and this negative material film, should have a leading flank and a trailing flank that is parallel to each other by multiple layer scroll, the extension area width of this aluminium flake and the extension area width of this copper sheet are the width less than this multiple layer scroll, each extension area of this aluminium flake is mutually to overlap and link together, and in fact with this multiple layer scroll before, trailing flank is vertical, each extension area of this copper sheet is mutually to overlap and link together, and in fact with this multiple layer scroll before, trailing flank is vertical, this two conductive electrode is to be located at this housing, the one conductive electrode is that the extension area with this aluminium flake is electrically connected, another conductive electrode is and the extension area electric connection of this copper sheet that this electrolyte is to be filled in the accommodation space of this housing.

Characteristics of the present utility model are to make secondary cell dwindle the battery volume as much as possible under the prerequisite that does not influence capacitance.

Description of drawings

Fig. 1 is the stereogram of existing multiple layer scroll;

Fig. 2 is the exploded view of existing multiple layer scroll;

Fig. 3 is the cutaway view of the utility model first preferred embodiment;

Fig. 4 is the stereogram of the multiple layer of the utility model first preferred embodiment scroll;

Fig. 5 is the exploded view of the multiple layer of the utility model first preferred embodiment scroll;

Fig. 6 is the making schematic diagram of the utility model first preferred embodiment;

Fig. 7 is the cutaway view of the utility model second preferred embodiment.

Embodiment

For more understanding structure of the present utility model and characteristics place, lift following two preferred embodiments and conjunction with figs. now and be described as follows:

See also Fig. 3, the secondary cell 20 that the utility model first preferred embodiment is provided is to include a housing 30, one multiple layer scroll 40, two

conductive electrode

80,82 and electrolyte 85.

This housing 30 is to have an accommodation space 32 and two perforation, 34 this accommodation space 32 of connection and the external worlds.

Should multiple layer scroll 40 be to be placed in the accommodation space 32 of this housing 30, and have a leading flank 42 and a trailing flank 44 that is parallel to each other, the structure of layer scroll 40 sees also Fig. 4 and Fig. 5 again, be by a positive pole 50, one barrier film 60, reel and form in the stacking in regular turn back of one negative pole 70 and another barrier film 60, this positive pole 50 has an aluminium flake 52 and two anode material films 54, this aluminium flake 52 has a reaction zone 521, one bonding pad 523 is connected with this reaction zone 521 with its base, and most extension areas 525 are connected with this bonding pad 523 with its base, before this two anode material film 54 is overlying on these aluminium flake 52 reaction zones 521, two surfaces, back, this anode material film 54 is to be made by LiCoO2, this negative pole 70 has a copper sheet 72 and two negative material films 74, this copper sheet 72 has a reaction zone 721, one bonding pad 723 is connected with this reaction zone 721 with its top margin, and most extension areas 725 are connected with this bonding pad 723 with its top margin, before this two negative materials film 74 is overlying on these copper sheet 72 reaction zones 721, two surfaces, back, this negative material film 74 is made by Jie's phase crystalline carbon (MCMB), this anode material film 54 is to overlap with this negative material film 74, this two barrier film 60 is to be made by polyethylene, and is positioned at the relative position of this anode material film 54 and this negative material film 74; Wherein, the extension area 525 width w1 of this aluminium flake 52 and the extension area 725 width w2 of this copper sheet 72 are the width w3 less than this multiple layer scroll 40, each extension area 525 of this aluminium flake 52 be mutually overlap and link together and in fact with the forward and backward side 42 of this multiple layer scroll 40,44 is vertical, each extension area 725 of this copper sheet 72 is mutually to overlap and link together, and it is same in fact vertical with the forward and backward

side

42,44 of being somebody's turn to do multiple layer scroll 40.

Wherein, the material of this anode material film 54 can substitute by other equivalent material, and for example: the lithiumation oxide of vanadium, titanium, chromium, copper, molybdenum, niobium, iron, nickel, cobalt or manganese, lithiumation sulfide, lithiumation selenides, lithiumation tellurides, lithium iron phosphate oxide, lithium vanadium phosphorus oxide or its mixture all can; The material of this negative material film 74 can also substitute by other equivalent material, for example: vapor deposition carbon fiber (VGCF), CNT (carbon nano-tube) (CNT), coke, carbon black, graphite, acetylene black, carbon fiber, nature of glass carbon or its mixture all can, 60 of this barrier films can polypropylene or polyester substitute.

This two conductive electrode 80,82nd is arranged in two perforation 34 of this housing 30, and one conductive electrode 80 is to be connected with the extension area 525 of this aluminium flake 52, and another conductive electrode 82 is to be connected with the extension area 725 of this copper sheet 72.

This electrolyte 85 is to be filled in the accommodation space 32 of this housing 30, electrolyte is the LiPF6 of 1.5M in this electrolyte 85, this electrolyte can adopt LiBF4, LiAsF6, LiSbF6, LiClO4, LiAlCl4, LiGaCl4, LiNO3, LiC (SO2CF3) 3, LiN (SO2CF3) 2, LiSCN, LiO3SCF2CF3, LiC6F5SO3, LiO2CCF3, LiSO3F, LiB (C6H5) 4, LiCF3SO3, LiB (C2O4) 2 or its mixture, and this electrolytical concentration can be 1.1～2.0M; Solvent in this electrolyte 85 then is the ethylene carbonate (ethylene carbonates) of percent by volume 30%, 20% propene carbonate (propylene carbonates) and 50% propyl acetate (Propyl acetate), in fact, this solvent also can adopt ethylene carbonate (ethylene carbonates), propene carbonate (propylene carbonates), butylene (butylene carbonates), dipropyl carbonate (dipropyl carbonates), acid anhydrides (acid anhydrides), positive methyl nafoxidine ketone (n-methylpyrrolidone), positive methyl ethanamide (n-methyl acetamide), positive methyl Dimethyl formamide (n-methylformamide), dimethyl amide (dimethyl formamide), gamma-butyrolacton (γ-butyrolactone), acetonitrile (acetonitrile), dimethyl sulfoxide (DMSO) (dimethyl sulfoxide), dimethyl sulphite (dimethyl sulfite), carbonic acid time vinylene (vinylene carbonate, VC), 1,2-diethoxyethane (1,2-diethoxyethane), 1,2-dimethoxy-ethane (1,2-dimethoxyethane), 1,2-dibutoxy ethane (1,2-dibutoxyethane), oxolane (tetrahydrofuran), 2-methyltetrahydrofuran (2-methyl tetrahydrofuran), expoxy propane (propylene oxide), methyl acetate (methyl acetate), ethyl acetate (ethyl acetate), propyl acetate (propyl acetate), methyl butyrate (methyl butyrate), ethyl butyrate (ethylbutyrate), methyl propionate (methyl propionate), ethyl propionate (ethyl propionate), dimethyl carbonate (Dimethyl Carbonate, DMC), diethyl carbonate (Diethyl Carbonate, DEC), carbonic acid Methylethyl ester (Ethyl Methyl Carbonate, EMC) or its mixture.

Please consult Fig. 6 again, should multiple layer scroll 40 when reality is made the one multiple layer scroll body 46 of preparation earlier, this body 46 is should the positive pole main body by one, one barrier film, reel and form in the stacking successively back of one negative pole main body and another this barrier film, this positive pole main body is to have an aluminium flake and two anode material films are overlying on this aluminium flake, this aluminium flake is not covered part by this anode material film and then forms a naked aluminium district 462, this negative pole main body has a copper sheet and two negative material films are overlying on this copper sheet main body, this copper sheet is not then formed a naked copper district 464 by locating of covering of this negative material film, the shape of this aluminium flake and this copper sheet is to be complete rectangle, and after reeling, the naked aluminium district 462 of this positive pole and the naked copper district 464 of this negative pole are the tops that lays respectively at this body 46, two ends, the end; Again will this naked aluminium district 462 and the central part in this naked copper district 464 in the mode of welding each floor is linked together, and cut out breach along the dotted line of Fig. 6, this naked aluminium district 462 can form the bonding pad 523 and the extension area 525 of this positive pole 50,464 in this naked copper district can form the bonding pad 723 and the extension area 725 of this negative pole 70, at this moment, again with the extension area 525 of this positive and negative electrode 50,70,725 respectively towards 90 ° of forward and backward two lateral bucklings, can finish aforesaid multiple layer scroll 30.

Layer scroll 40 is when making again, because the extra operation procedures such as cutting and bend aluminium flake 52 and copper sheet 72 that increases, therefore can existingly not cut bending person shorter for its length, by this, this housing 20 also can cooperate this multiple layer scroll 50 and reduce its length, thereby reach the purpose of dwindling cell integrated volume, both positive and negative polarity reaction zone 521 as for reality decision battery capacity, 721 and positive and negative

pole material film

54,74 area and structures of still keeping before cutting, therefore unlikely capacitance to battery impacts, and makes the capacitance height and the volume of this battery light and handy, and reaches the purpose of this utility model.

Based on spirit of the present utility model, the structure of this two conducting strip also has multiple variation in fact, please consult Fig. 7 again, the secondary cell 90 that the utility model second preferred embodiment is provided is roughly the same with aforementioned first preferred embodiment supplier of institute, its difference only is, two conductive electrode 92 of this secondary cell 90 are to be located at housing 94 outer walls, and respectively by connect again the extension area 983 of layer scroll 98 positive poles 981 and the extension area 987 of negative pole 985 respectively by a lead 96.

Claims

1. capacitance height and the little secondary cell of volume is characterized in that, include:

One housing is to have an accommodation space;

One multiple layer scroll, be to be placed in the accommodation space of this housing, should multiple layer scroll be by a positive pole, one barrier film, reel and form in the stacking in regular turn back of one negative pole and another barrier film, this is just having an aluminium flake and at least one anode material film, this aluminium flake has a reaction zone and covers thereon for this anode material film, one bonding pad is connected with this reaction zone with its base, and most extension areas are connected with this bonding pad with its base, this negative pole has a copper sheet and at least one negative material film, this copper sheet has a reaction zone and covers thereon for this negative material film, one bonding pad is connected with this reaction zone with its top margin, and most extension areas are connected with this bonding pad with its top margin, this anode material film is to overlap with this negative material film, and this two barrier film is the relative position that is positioned at this anode material film and this negative material film; Wherein, should have a leading flank and a trailing flank that is parallel to each other by multiple layer scroll, the extension area width of this aluminium flake and the extension area width of this copper sheet are the width less than this multiple layer scroll, each extension area of this aluminium flake be mutually overlap and link together and in fact with the forward and backward lateral vertical of this multiple layer scroll, each extension area of this copper sheet be overlap mutually and link together and in fact with the forward and backward lateral vertical of this multiple layer scroll;

Two conductive electrode are to be located at this housing, and the one conductive electrode is that the extension area with this aluminium flake is electrically connected, and another conductive electrode is that the extension area with this copper sheet electrically connects; And

Electrolyte is to be filled in the accommodation space of this housing.

2. the little secondary cell of capacitance height and volume according to claim 1 is characterized in that, described this housing has two perforation and wears for these two conductive electrode.

3. the little secondary cell of capacitance height and volume according to claim 1 is characterized in that the extension area of described this aluminium flake and the extension area of this copper sheet are respectively to utilize a lead to be connected with this two conductive electrode.