CN100555711C - Battery pack - Google Patents
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- CN100555711C CN100555711C CNB2005800249282A CN200580024928A CN100555711C CN 100555711 C CN100555711 C CN 100555711C CN B2005800249282 A CNB2005800249282 A CN B2005800249282A CN 200580024928 A CN200580024928 A CN 200580024928A CN 100555711 C CN100555711 C CN 100555711C
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A kind of battery pack of following formation, thereby by using DI forming method or roller to form shell element that manufactured forms by the thin wall cylindrical metal tube and with the shape approximate match of this shell element moulding with cell device, with the formation shell; In this shell, deposit the power producing component of connecting circuit plate; And the open section by protecgulum and bonnet closure, protecgulum and bonnet are made by for example resin forming.The power producing component uses the stacked film of cell device is contained in state the shell from outer wrap or cell device under.And in order to suppress penetration of moisture in battery, the moisture agent for capturing that absorbs moisture may be combined in the resin material of protecgulum and bonnet.
Description
Technical field
The present invention relates to a kind of battery pack, it is fit to be applied to for example rectangle polymer battery.
Background technology
In recent years, for example the personal computer of notebook size, portable phone, PDA portable electric appts such as (personal digital assistants) are popular, and the lithium ion battery with high voltage, high-energy-density and light weight advantage is widely used as power supply.
In addition, as the countermeasure that becomes the leak of liquid of problem under the situation of using the liquid system electrolyte solution, for example gelinite high polymer film that wherein the non-aqueous electrolytic solution injection of polymer is obtained or all solid state electrolyte have dropped into actual use as electrolytical lithium ion polymer secondary cell.
Lithium ion polymer secondary cell has such battery unit structure, wherein have positive electrode, negative electrode, polymer dielectric and wherein lead-in wire be coated with adventitia from the cell device that positive electrode and negative electrode are drawn respectively, aluminium lamination for example.In addition, battery unit is loaded in the box-like molded housing, and the paired last lower casing that this housing is formed from a resin forms with the terminal block with protective circuit, splicing ear etc.
As mentioned above, the conventional polymer battery is finally sold user etc. as the battery pack product, and the cell device that wherein is coated with aluminium lamination, terminal block etc. is covered by the molded housing that is become by paired hull shape up and down.
In such battery pack, need to improve the volume energy efficiency.For example, in JP-A-2002-184364, the rectangular battery structure has been proposed, wherein four of battery unit interconnective surfaces cover one deck resin molding continuously, and the coupling part is set in the surface of zonule of battery unit, in the coupling part, the resin molding of clad battery unit is capped, and therefore reduces thickness.
Yet the conventional batteries group has following problems.The structure of the conventional batteries group that is covered by molded housing according to battery unit wherein for the vibration protecting battery unit not to be subjected to apply from the outside etc. influences, need be made as the thickness of molded housing about 0.3 value in the 0.4mm scope.Therefore, when consider to be used for battery unit be fixed to the two-sided tape of molded housing, during with the moulding of molded housing during tolerance etc., the thickness of battery pack is increased to above the thickness of battery unit about 0.8 to 1.0mm.
Cover the structure of the molded housing that the paired hull shape up and down that is formed from a resin becomes according to battery unit wherein, in preferred situation by lower casing on for example ultra-sonic welded connects, thickness that need the coupling part is set to about 0.7mm.Therefore, the thickness of battery pack is increased to above the about 1.4mm of the thickness of battery unit.Have the situation of about 4.0mm thickness at battery unit, inevitably the volume of battery pack is increased about 1.3 to 1.4 times of battery unit size.
In addition, according to the battery pack of current polymer battery, cell device is had the stacked film parcel of about 0.1mm thickness, and the stacked film in battery unit peripheral part is by sealings such as thermal welds, and the battery pack of gained is further packed in the shell that is made of plastics.Therefore, if exist such battery pack pack into the similar metal can of liquid system battery in problem that volumetric efficiency reduces.
For fear of such problem,,, but can constitute battery pack with enough hardness even thickness is little by with the shell clad battery unit that is made of metal.For example, aluminium pot can be as the shell of the rectangular battery group of using the electrolytical lithium ion battery of liquid system etc.The rectangular metal jar that is formed by aluminium etc. is mainly by the drawing process moulding.
Yet under existing situation, when attenuate passed through the metal can of drawing process moulding, the thickness limits of such metal can equaled about 0.2mm.This is because the open height of the metal can by the drawing process moulding depends on the intensity of the mould (set of molds) that is used to stretch.Therefore, only by using common drawing process to be difficult to realize being equal to or less than the thickness of about 0.1mm.
Therefore, the purpose of this invention is to provide a kind of battery pack, the thickness of the shell by reducing the clad battery unit wherein because the volume increase that shell causes reduced, and can guarantee the reliability and the fail safe of mechanical strength and terminal.
Summary of the invention
To achieve these goals, according to the present invention, the rectangular battery unit inserts in the metal shell, this shell is shaped to almost consistent with the profile of rectangular battery unit cylindrical shape by the cylinder that outer surface thickness is little and obtains, and lid is respectively installed to the both ends open part of shell, therefore forms battery pack.At this moment, can be by with the folded film of cell device outer cover, perhaps use cell device as it is and form the rectangular battery unit.In order to prevent that penetration of moisture from arriving the cell device part, can also be mixed into the resin that forms lid by the moisture agent for capturing that will be used for absorbing moisture and form lid, cover and be installed to shell openings at two ends part.
Description of drawings
Fig. 1 is the schematic diagram that the structure of using battery pack of the present invention is shown;
Fig. 2 is the schematic diagram that the structure of the cell device in the battery pack of packing into is shown;
Fig. 3 is the schematic diagram that the external view of using battery pack of the present invention is shown;
Fig. 4 is the schematic diagram that the step of DI (squeeze and the stretch) method of forming as the manufacture method of using shell of the present invention is shown;
Fig. 5 is the schematic diagram that the step of the DI method of forming is shown;
Fig. 6 is the schematic diagram that specifically illustrates the DI method of forming;
Fig. 7 is the schematic diagram that the manufacture method of using shell of the present invention is shown;
Fig. 8 is the schematic diagram that the manufacture method of using shell of the present invention is shown;
Fig. 9 is the schematic diagram of another example that the installation method of lid is shown;
Figure 10 is the schematic diagram of another example that the installation method of lid is shown;
Figure 11 is the schematic diagram of example that another structure of lid is shown, and wherein A is an end view, and B is the profile of being got along the line X1-X1 among the A, and C is a plane graph, and D is the profile of being got along the line Y1-Y1 among the C, and E is the end view of observing from the opposite side of A;
Figure 12 is the schematic diagram of another example that the installation method of lid is shown;
Figure 13 is the schematic diagram that the structure of using battery pack of the present invention is shown;
Figure 14 is the schematic diagram that the step when using shell of the present invention by the formation of roll forming established law is shown.
Embodiment
Embodiments of the invention are described below with reference to the accompanying drawings.As mentioned above, in the present invention, in the time of in battery unit is packed shell into, can use the battery unit that forms by at the folded film of cell device outer cover, perhaps can be used as it is battery unit.At first, will describe in detail by covering the battery unit that stacked film forms in the cell device outside.
Fig. 1 is the decomposition diagram according to the battery pack of present embodiment.Reference number 1 is represented the battery unit of battery, and this battery for example is a lithium ion polymer secondary cell.Battery unit 1 forms by cell device is covered as the stacked film that coats (sheathing) element.The profile of battery unit 1 almost is a rectangle.
As shown in Figure 2, cell device 10 constitutes as follows, and band shape positive electrode 11 is layered on the spacer 13a, band shape negative electrode 12 is layered on the spacer 13b, and they longitudinally twine, and respectively, lead-in wire 2 is drawn from positive electrode 11, and goes between and 3 draw from negative electrode 12.By positive electrode and negative electrode and partition layer being stacked the multilayer electrode assembly that obtains except the structure of longitudinally twining, can also have the structure that forms by bending method, method of piling etc.
In positive electrode 11, the active positive electrode material layer is formed on the band shape positive electrode current collector (collector), and polymer electrolytic layer 14 is formed on the active positive electrode material layer.In negative electrode 12, the negative electrode active material layer is formed on the band shape negative electrode current collector, and polymer electrolytic layer 14 is formed on the negative electrode active material layer.Lead-in wire 2 and 3 is connected respectively to positive electrode current collector and negative electrode current collector.The following material that has proposed can be used as active positive electrode material, negative electrode active material and polymer dielectric.
In positive electrode, according to the kind of target battery, metal oxide, metal sulfide or specific high polymer can constitute active positive electrode material.For example, the situation forming lithium ion battery mainly comprises Li
xMO
2(in this expression formula, M represents one or more transition metal, and x generally is equal to or greater than 0.05 and be equal to or less than 1.10 value, though should value according to the charge/discharge state of battery and difference) lithium composite xoide etc. can be used as active positive electrode material.Cobalt (Co), nickel (Ni), manganese (Mn) etc. are preferred as the transition metal M that constitutes lithium composite xoide.
Concrete example as such lithium ion complex oxide can be pointed out that LiCoO
2, LiNiO
2, LiMn
2O
4, LiNi
yCo
1-yO
2(0＜y＜1) etc.According to these lithium composite xoides, can produce high pressure and can obtain excellent energy density.Do not comprise for example TiS of the metal sulfide of lithium or oxide
2, MoS
2, NbSe
2, V
2O
5Deng also being used as active positive electrode material.The multiple combination of these active positive electrode materials also can be used as positive electrode.When forming positive electrode, can increase electric conducting material, adhesive etc. by the aforesaid active positive electrode material of use.
For example, be used as electric conducting material such as material with carbon elements such as carbon black or graphite.For example polyvinylidene fluoride (polyvinylidene fluoride), polytetrafluoroethylene, polyvinylidene fluoride etc. are as adhesive.
The material that can mix (dope) lithium or slough (dedope) lithium can be used as negative electrode material.For example, can use material with carbon element such as anti-graphitized carbon material or graphite material.More specifically, can use for example pyrolysis carbon family, coke family (pitch coke, needle coke, petroleum coke), graphite family, glassy carbon (vitrified carbon) family, organic polymer compound roasted material (by under proper temperature, toasting phenolic resins, furans (fran) resin etc. and its carbonization being obtained), carbon fiber, activated carbon etc.In addition, for example high polymer such as polyacetylene, polypyrrole or for example SnO
2Can be used as the material that mixes lithium or slough lithium Deng oxide.When negative electrode is formed by these materials, can add adhesive etc.For example, polyvinylidene fluoride, styrene butadiene rubbers etc. are as adhesive.
Polymer dielectric forms by such method, becomes the electrolyte osmosis of gel in polymer thereby wherein mixed high polymer material, electrolyte solution and electrolytic salt.High polymer material has the character compatible with electrolyte solution, and a kind of material in this back comprises: the silicon gel; Acrylic gel; The acrylonitrile gel; Polyphosphazene sex change (polyphosphazene-denatured) polymer; Poly(ethylene oxide); PPOX; With their composition polymer, cross-linked polymer, sex change polymer etc.; Perhaps fluorocarbon polymer is for example such as the high polymer material of polyvinylidene fluoride, poly-(vinylidene fluoride-altogether-hexafluoropropylene), poly-(vinylidene fluoride-altogether-trifluoro propene) etc.; And their mixture.
The electrolyte solution composition can make above-mentioned high polymer material disperse, and aprotic solvent uses for example ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC) etc.As electrolytic salt, use the material compatible with solvent, and by cation and anionic constituting.Alkali metal or alkaline-earth metal are as cation.Cl
-, Br
-, I
-, SCN
-, ClO4
-, BF
4 -, PF
6 -, CF
3SO
3 -Deng as anion.Particularly, use the electrolytic salt of concentration like this, make LiPF
6Or LiBF
4Can be dissolved in this electrolyte solution.
Stacked film is the multilayer film that obtains by with film shape metal and synthetic resin bonding, and has following structure, and promptly for example hot weld layer, metal level and sealer stack gradually from the inside that contacts with cell device.Polypropylene (PP) layer or polyethylene (PE) layer can be used as the hot weld layer.Aluminium (Al) layer can be used as metal level.Nylon layer or PETG (PET) layer can be used as sealer.
Polypropylene layer and polyethylene layer have the thermal weld function and prevent the function that polymer dielectric changes.(Casted Polypropylene, CPP) (non-directional polypropylene) wait to be used as polypropylene layer to the cast polypropylene.Non-directional low density polyethylene (LDPE)s (LLDPE) etc. are as polyethylene layer.For example, form polypropylene (PP) layer with about 30 μ m thickness.Polypropylene (PP) layer and polyethylene layer have the fusing point that makes that battery unit 1 is not influenced by heat, and this heat is applied to battery unit 1 by thermal weld.
Aluminium lamination has and prevents the function of moisture vapour transmission in the layer.The aluminium of annealing in process (8021-O JIS H4160) or (8079-O JIS H 4160) etc. can be used as aluminium lamination.Used thickness is positioned at the aluminium lamination of about 30 to 130 mu m ranges.Have the function of absorption moisture or the situation that the hydatogenesis film is used as the barrier that stops moisture vapour transmission at resin that constitutes stacked film or adhesive, can omit such metal level.
Nylon layer or PETG (PET) layer has the function with the external isolation of aluminium lamination and battery unit 1, and has the thickness of about 10 to 30 μ m.By also passing through the outside is formed nylon layer or PETG layer at the inner polypropylene layer that forms of the aluminium that contacts with cell device, polypropylene layer welded before nylon layer or PETG layer.Therefore, for example, in the situation by thermal weld sealing stacked film, they can easily be connected.
The lead-in wire 2 and 3 that is connected respectively to positive electrode and negative electrode is drawn from one of the edge surface of battery unit 1 (front side).For example holding element 4 be installed to the lead-in wire 2 and 3, thereby will go between 2 and 3 be clipped in together in the middle of.Holding element 4 is for example made by the synthetic resin material with insulation property, and stably the holding circuit plate 5, and with circuit board 5 and battery unit 11 insulation.
The circuit board 5 that is fixed to lead-in wire 2 and 3 is loaded in the protecgulum 6.A plurality of for example 3 contact portions are formed on the circuit board 5 of protecgulum 6 sides.
Protecgulum 6 and bonnet 7 be by for example synthetic resin material or with the profile member of shell 8 identical materials moulding, this synthetic resin material is Merlon (PC), polypropylene (PP), ABS resin (acrylonitrile butadient styrene), polyamide-based thermoplastic resin etc. for example, to explain in the back that with shell 8 identical materials it for example is aluminium, stainless steel metal materials such as (SUS).Protecgulum 6 and bonnet 7 are respectively installed to cylinder blanket 8 openings at two ends parts, and closure 8.
The retaining part that the circuit board 5 that maintenance is packed into does not shake is provided at protecgulum 6 inside.As shown in Figure 3, opening 9 is formed on the corresponding position of contact portion that has with circuit board.The contact portion of circuit board 5 is exposed to the outside by opening 9.The contact portion that opening 9 will be formed on the circuit board 5 that is fixed in protecgulum 6 inside is set to be electrically connected with external circuit.Because protecgulum 6 has opening 9, it is preferably made by the synthetic resin material.
The a pair of lid that comprises protecgulum 6 and bonnet 7 is connected to shell 8 by the installation method that is fit to their materials.Make by the synthetic resin material as operculum,, cover and shell 8 can be fixed by thermal weld for example by in being connected the film that surface laminated polypropylene (PP), polyethylene (PE) wait and adding the hot link surface of shell 8 and lid.
Protecgulum 6, bonnet 7 and shell 8 can bond with the resin system binding agent, and this binding agent for example is to comprise the chemical reaction type binding agent of silicones distortion polymer as key component, for example by CemedineCo., and " the super X series " that Ltd makes etc.If using hot melt is resin, then shell 8 and lid can be bonded in the profile of moulding protecgulum 6 and bonnet 7.Shell 8, protecgulum 6 and bonnet 7 also can be connected by joint filling (caulking).
If protecgulum 6 and bonnet 7 be by making with shell 8 identical materials, this material is for example such as metal materials such as aluminium, during rectangle jar made of aluminum that then they can be by using in producing conventional lithium ion polymer battery by connection such as welding grade.
Shell 8 has and be fit to insert battery unit 1 and it is sealed in wherein cylindrical shape.Shell 8 forms by the method for forming, and this will explain in the back, thereby its thickness is very little, is about 0.1mm.Shell 8 is made by the material that can protect internal cell unit 1 not influenced by the vibration etc. from the outside, even its thickness is little, this material is for example such as the metal of aluminium, titanium, iron, stainless steel (SUS) etc.For example materials such as 3003H18,3004H18,1N30-H18 can be used as aluminium.According to these aluminums, because Vickers hardness is equal to or greater than 20,, equal about 0.1mm even therefore outer casing thickness is very little, also can proof strength.
Battery pack with external view shown in Figure 3 constitutes by above-mentioned part.
The method of forming of shell 8 will be described now.Basically, when forming sidewall thinly, the intensity of shell with cylindrical shape is stronger, and sidewall can form thinlyyer than the shell with rectangular tubular.For example, when shell was thinned, the limiting value of the thickness of the sidewall of rectangular tubular equaled about 0.2mm.Yet the thickness of the sidewall of cylindrical shape can be reduced to about 0.1mm.By using such fact, as shown in Figure 4, shell 8 at first forms cylindrical and processed, thereby the thickness on cylindrical periphery surface is reduced to about 0.1mm.Then, it is formed as almost consistent tubular of profile with battery unit 1, i.e. rectangular tubular.The cylindrical shell element that its sidewall approaches is by DI (squeeze and stretch) method of forming moulding.The DI method of forming is a kind of extrusion process technology, and sidewall can be by stretching and squeezing and draw and formation thinly.
To the example that produce crust component (shell) by the DI method of forming be described with reference to figure 5 and 6.At first, in punching press blank (blank punching-out) step, the dish 21 that is called blank is stamped to form by the metallic plate 20 with about 0.3mm thickness.In recessed pressure (cupping) step, the circumferential lateral surface of the blank 21 of punching press is held, and the core of blank 21 is extruded, so moulding has the cup-shaped crust component 22 of low sidewall.
Deep-draw and crowded drawing in the step, cylindrical can is cup-shaped crust component 22 miniaturizations by deep-draw, thereby the diameter of column part equals desired size, and the sidewall of column part is extended thinly by formed by extrusion and tension.Therefore, can obtain that peripheral surface thickness is very little to be the crust component 23 of about 0.1mm.The thorax hole of the column part of crust component 23 is set, makes battery unit 1 to insert and its inner surface is a bit larger tham the area on the insertion surface of battery unit 1.
In pre-shaping step, finishing has been carried out deep-draw and has been squeezed the two ends of the crust component 23 that draws.Therefore, form the cylindrical shell element 24 of peripheral surface with expectation thickness and thorax hole.Be cut by the recessed/convex portion of the sidewall edge of the crust component 23 of deep-draw and crowded pull-shaped one-tenth and separate and the bottom also is cut and the reason of separating is in order to obtain rectangular tubular rather than cylindrical can by finishing.
In cutting step, the sidewall of crust component 24 is cut, thereby it highly equals the corresponding length of length with the battery unit 1 of packing into, and therefore the shape according to cell device 1 forms cylindrical shell element 25.Therefore, form cylindrical shell element shown in Figure 4.For example, a cylinder that obtains from pre-shaping step can obtain a plurality of cylindrical shell elements 15 corresponding to battery unit 1 shape.
To describe deep-draw and ironing in detail with reference to figure 6.Drawing-die 31a, 31b, 31c and 31d are crowded to be drawn cup-shaped crust component 22 by drift (punch) 30 deep-draws and by squeezing.Crust component 22a in the step that is formed thin outer crust element 23 by cup-shaped crust component 22 is shown in Figure 6.At this moment, the moldable property of crust component 22a is improved by the lubricant/coolant shown in reference number 32a, 32b, 32c and the 32d.
After so formation had the cylindrical shell element 25 of big thickness, the crust component 25 of formation was formed as rectangular tubular, and this rectangular tubular almost profile with battery unit 1 is consistent.Shown in Fig. 7 A and 7B, can moulding rectangular tube shape by cylindrical shell element 25 for example being used punch die 34a and 34b and profile member 35.Therefore, can form the shell 8 of the rectangular tubular of the suitable insertion battery unit 1 shown in Fig. 7 B.
Also can use the method shown in Fig. 8 A and 8B.In this situation, be almost oval-shaped shell by cylindrical shell element 25 being used punch die 36a and 36b and profile member 37a and 37b can obtain the cross section.
The forming method of rectangular tubular is not special the qualification, as long as this method can be by the cylindrical rectangular tubular that is shaped to.
In the process that produces conventional rectangular tube shape, consider intensity, be difficult to the thickness of peripheral surface is made as about 0.2mm or following.Yet after the thickness on cylinder peripheral surface reduced owing to cylindrical shape, crust component was formed as the rectangular tubular according to battery unit 1 shape, and peripheral surface thickness is very little to be the rectangular tubular of about 0.1mm thereby can form.Formed the seamless solid shell 8 of the very little as mentioned above rectangular tubular of peripheral surface thickness.
The battery unit 1 of connecting circuit plate 5 is inserted in the shell 8 of rectangular tube shape, and the two ends of shell 8 are respectively by 7 sealings of protecgulum 6 and bonnet, thereby forms battery pack.Circuit board 5 also can be connected to battery unit 1 after battery unit 1 is inserted in the shell 8.Battery unit 1 has and is expanded by initial charge and character that after this charge/discharge state is not returned to original dimension.Therefore, for example by after being inserted into battery unit 1 in the shell 8 before initial charge, by the expansion of battery unit 1, battery unit 1 is tightly fitted in the shell 8, therefore makes battery unit 1 to be fixed.
As required, by with the similar method of the battery pack of conventional lithium ion polymer secondary cell, carry out the insulation processing of shell 8 and outward appearance and handle.By form the situation that resin bed etc. carries out insulation processing on the outer surface of shell 8, for example information such as character, picture also can be by laser printing on resin bed.Therefore, can printed design or product information and do not use label, and can further be beneficial to the raising volumetric efficiency.
As mentioned above, in the battery pack according to present embodiment, when forming shell 8, it forms the cylindrical shape of thin sidewalls by the DI method of forming etc., and this shell is formed as the rectangular tubular that is fit to insert battery unit 1 subsequently.Therefore, even shell 8 has rectangular tubular, the shell that sidewall thickness is very little also can seamlessly form.Therefore, even battery unit 1 is a rectangle, also can used thickness very little and have a high-intensity shell.Therefore, the increase of the capacity that shell 8 is required can reduce, and can guarantee the reliability and the fail safe of enough mechanical strengths and terminal.In the situation of the conventional batteries group of using shell molds,, in situation, can obtain the volumetric efficiency more than 90% according to battery pack of the present invention though that the volumetric efficiency of battery main body equals is about 78%.
In situation,, can easily change the external dimensions of shell 8, for example width, the degree of depth, height etc. by changing a part of punch die that uses by stretching and formed by extrusion and tension shell 8.Therefore, the degree of freedom height when shell 8 forms, and can easily form shell 8 according to the battery unit 1 of various sizes.
Because shell 8 is made by metal material, so can easily carry out inner surface treatment and coat handling.Therefore, can the inner surface and/or the outer surface of shell 8 easily be insulated, processing such as surface protection, and the fail safe that can easily improve battery pack.
Because shell 8 also is metal shell, prevent the effect of moisture vapour transmission in the battery so have.Therefore, for the battery unit that is inserted in the shell, also can use cell device to be sealed into the battery unit of resin molding rather than the folded mould of aluminium lamination.Resin molding is a composite membrane, and the external resin layer that wherein adheres to the aluminium lamination outer surface of aluminium stacked film directly adheres to the internal resin layer that adheres to the aluminium lamination inner surface.In the situation of using such composite membrane, because aluminium lamination (metal level) is optional, so volumetric efficiency can further improve.
For protecgulum, as shown in Figure 9, installation jut 43a is arranged on and covers 43 sides, and installing hole part 42a is arranged on shell 42 sides.When lid 43 inserts in the shell 42 by pressure, jut 43a is installed inserts installing hole part 42a, can be fixed to shell 42 reliably thereby cover 43.In this situation, conical surface 43b also can be formed on and cover a lateral edges of 43, thereby makes that the insertion in shell 42 is easy.By with above-mentioned lid 43 closures 42, battery pack can be reliably can 42 inboard and prevent infiltrations such as moisture, dust hermetic, and can obtain high reliability.
In above-mentioned battery pack 1, various improvement all are possible.For example, as the package assembly of lid 43 and circuit board 45, also can use package assembly shown in Figure 10.The package assembly of lid 43 and circuit board 45 will be described below.
At first, the lid 43 in this situation mainly is made of cover plate 51, cover plate 51 by with the opening portion of mode closure 42 like the above-mentioned example class.The fixed claw 52 that is used for fixing shell 42 is provided to and covers 43 two ends, thereby outwards outstanding.The battery main body supporting projections 53 that contacts with battery 50 when lid 43 is installed to shell 42 and self-contained battery is formed on the interior location of each fixed claw 52.In addition, plate two end supports part 54 and plate center support part 55 are arranged on the preset space length place with cover plate 51, that is, and and at the spacing place of circuit board 45 thickness no better than.Circuit board 45 is inserted in the gap between cover plate 51 and the plate two end supports part 54, and is inserted in the gap between cover plate 51 and the plate center support part 55, and remains to and cover 43.
Figure 11 illustrates the detailed structure of cover plate 43.Each plate two end supports part 54 not only has the supporting bracket 54a that is used for support circuit plate 45 rear surfaces, and has the lateral support part 54b that is used for support circuit plate 45 1 lateral edges.Therefore, when circuit board 45 was inserted in the gap, circuit board 45 was arranged on direction of insertion by lateral support part 54b.
One lateral edges of plate center support part 55 and cover plate 51 couplings, and opposite side edge 55a side is a free edge.Plate center support part 55 is pushed to cover plate 51 sides by the elastic force that for example resin has.Insert circuit board 45 by overcoming thrust, circuit board 45 is installed to and covers 43, and its state is that the rear surface is promoted by plate center support part 55.Paired fixed claw 55b is provided at the opposite side edge 55a of plate center support part 55.When mounting circuit boards 45, fixed claw 55b is with the side surface of distal side edge support section 54b support circuit plate 45, and vertical direction in the drawings is provided with circuit board 45, therefore prevents the accidental of circuit board 45.
In addition, location hole 55c is provided at the base side of plate center support part 55.Locator protrusions 45a is provided at the position of circuit board 45 corresponding to location hole 55c.When circuit board 45 is installed in the gap, be inserted into the location hole 55c of plate center support part 55 by locator protrusions 45a with circuit board 45, formed circuit board 45 to the location of lid 43 particularly in the drawings the right side/left to the location.
Figure 12 shows and covers 43 installment states to shell 42.By extruding cover 43 and battery 50 also will cover the installing hole part 42a that 43 fixed claw 52 is fixed to shell 42 together, can carry out by covering the sealing of 43 pairs of shells 42.At this moment, contact with the edge surface of battery 50 the 43 battery main body supporting projections 53 that provide are provided, thereby battery 50 is fixed in the shell 42 reliably.
To describe as another embodiment and use the outside battery pack that does not cover the cell device of stacked film.Explain such battery pack below with reference to the accompanying drawings.
Figure 13 is to use the decomposition diagram of the battery pack of the outside battery unit that does not cover stacked film.Reference number 61 is represented the cell device of battery, and this battery for example is a lithium ion polymer secondary cell.Cell device 61 can form by material similar to the above embodiments and method.
In being similar to the mode of the foregoing description, the lead-in wire 62 and 63 of holding element 64 being installed having been drawn from an end surfaces of the front side of cell device 61.Holding element 64 is made by the synthetic resin material that for example has insulation property, stablizes holding circuit plate 65, and with circuit board 65 and cell device 61 insulation.Circuit board 65 is fixed to the lead-in wire of giving prominence to from holding element 64 62 and 63 by resistance welded, ultra-sonic welded etc.Protective circuit, ID resistance etc. are installed on the circuit board 65.Being fixed to lead-in wire 62 and 63 circuit board 65 packs in the protecgulum 66.A plurality of for example three contact portions are formed on the circuit board 65 of protecgulum 66 sides.
Protecgulum 66 and bonnet 67 are profile members of being made by for example synthetic resin material, and this synthetic resin material for example is Merlon (PC), polypropylene (PP), ABS resin (acrylonitrile butadient styrene), polyamide-based thermoplastic resin etc.Protecgulum 66 and bonnet 67 are installed to cylindrical shell 68 openings at two ends part and closure 68.Using the outside situation that does not cover the cell device of stacked film, because protecgulum 66 and bonnet 67 need insulation property, so do not use for example aluminium, stainless steel materials such as (SUS).
The moisture agent for capturing may be mixed in in the resin that constitutes protecgulum 66 and bonnet 67 to improve moisture barrier properties.As the moisture agent for capturing, preferred use can easily form the agent for capturing of hydrate, and for example general formula is by MSO
4Or M
2SO
4That represents comprises that sulfate (in this expression formula, M is selected from Na, K, Mg and Ca) or general formula are by (CH
2-CH (COOM)-)
nThe polyacrylate (in this expression formula, M is selected from Na, K, Mg and Ca) etc. of expression, and described moisture agent for capturing with the mixed in the 10% following scope more than 0.2% in resin.
The a pair of lid that comprises protecgulum 66 and bonnet 67 is connected to shell 68 by the installation method that is fit to their materials.Make by the synthetic resin material as operculum,, then cover and shell 68 can be fixed by thermal weld for example by at the film that is connected laminated polypropylene on the surface (PP), polyethylene (PE) etc. of shell 68 and lid and add the hot link surface.
If using hot melt is resin, then shell 68 and lid can be installed in the profile moulding of lid.It is in the resin that the moisture agent for capturing may be mixed in to hot melt, to improve moisture barrier properties.As the moisture agent for capturing, preferred use can easily form the agent for capturing of hydroxide, and for example general formula is by MSO
4Or M
2SO
4That represents comprises that sulfate (in this expression formula, M is selected from Na, K, Mg and Ca) or general formula are by (CH
2-CH (COOM)-)
nThe polyacrylate (in this expression formula, M is selected from Na, K, Mg and Ca) etc. of expression, and described moisture agent for capturing with the mixed in the 10% following scope more than 0.2% in resin.
In being similar to the mode of the foregoing description, shell 68 has and be fit to insert cell device 61 and it is enclosed in wherein cylindrical shape.As for the thickness of shell 68, thereby it forms the thickness with about 0.1mm by the DI method of forming.Shell 68 is formed by for example aluminium, iron, stainless steel metals such as (SUS).For example materials such as 3003H18,3004H18,1N30-H18 can be used as aluminium.According to these aluminums, because Vickers hardness is equal to or greater than 20, even the thickness of shell is little of equaling about 0.1mm, also can proof strength.
Battery pack is by above-mentioned part manufacturing.Part of using during as the manufacturing battery pack and their material can use part similar to the above embodiments and material.
Owing to use the outside cell device that does not cover stacked film, be important so the inner surface of shell 68 is carried out insulation processing.As the method for insulation processing, particularly,, can use alumite (alumite) to handle the method for its inner wall section in shell 68 situation made of aluminum.Carry out alumite technology on the aluminium surface, forming anodized coating, and this oxide covering plays insulating barrier.According to alumite technology, the surface can be insulated and not increase the thickness of shell 68.The part of carrying out alumite technology is the inwall of shell 68 at least, and there is the possibility that contacts with cell device 61 in this inwall.Yet, the invention is not restricted to this part, but can carry out alumite technology whole casing.
Perhaps, replace aluminium technology, shell 68 forms by the composite material that resin molding is adhered to aluminium and obtain by deep-draw, and resin molding is set to the inwall side, therefore also can guarantee the insulation property of battery unit 61.In this case, most of shell 68 is made of aluminum and obtain polypropylene, polyethylene, ionomer (ionomer), ethene-methacrylate (ethylene-methacrylate) copolymer, ethene-methylpropanoic acid olefin(e) acid (ethylene-methacrylic acid) copolymer, ethene-methacrylate (ethylene-methylacrylate) copolymer etc. and adhered to inner wall surface.
Preferably thickness of resin film is made as 5 to 30mm.Owing to use shell 68 by cylindrical moulding rectangle is obtained, though exist it is shaped to rectangle and cell device 61 is packed into after, shell can be reverted to original shape and it is deformed into the shape of expansion.By the adhered resin film, owing to can obtain hot adhesion character to the cell device in the shell of packing into, so the variation of the encapsulation that can suppress to finish.
Insulation also can obtain by such structure, wherein the separator that is arranged between positive electrode and the negative electrode when making cell device 61 is provided with longlyer than each positive electrode and negative electrode, and the outer peripheral portion of cell device 61 is coated with separator, perhaps by carry out the method for baking process then to the inner wall section sprayed coating.
As mentioned above, in the battery pack according to present embodiment, the outside does not cover stacked film owing to use the cell device of the shell of packing into, thus can guarantee the reliability and the fail safe of enough mechanical strengths and terminal, and further improve volumetric efficiency.Equal about 78% according to the volumetric efficiency of the battery main body of the conventional batteries group of using shell molds, and the situation of the battery pack of present embodiment can obtain the volumetric efficiency more than 95%.
Though formed cylindrical shell element (metal tube) by the DI method of forming in the above-described embodiments, the generation of cylindrical shell element is not limited to this method, but also can be by formation such as roll forming established law shown in Figure 14.In the situation that forms the cylindrical shell element by the roll forming established law, a plurality of rolling rollers (rolling roller) that are used for moulding are arranged on the circumferential lateral surface of cylindrical can, and this cylindrical can penetrates between a plurality of rollers gradually, therefore crust component is shaped to the shape that needs.
Below with reference to embodiment the present invention is described.In these embodiments, the structure (having or do not exist the stacked film covering) that changes cell device and shell forms battery pack, and has compared volumetric efficiency.
Wherein the assembly that has been connected to battery unit such as circuit board is inserted in cylindrical the subsiding (collapsed) jar, this cylindrical jar that subsides is shaped to rectangular shape by the cylindrical metal pipe with 0.1mm thickness with the manufacturing of the DI method of forming and obtains, in this battery unit, cell device with 4.0mm thickness is covered the aluminium lamination with 0.1mm thickness by the outside, and be installed in two open ends of the cylindrical jar that subsides and be welded to shell by protecgulum and the bonnet that resin forming forms, therefore form battery pack.
Wherein the assembly that has been connected to battery unit such as circuit board is inserted in the cylindrical jar that subsides, this cylindrical jar that subsides is shaped to rectangular shape by the cylindrical metal pipe with 0.1mm thickness that roller is formed manufactured and obtains, in this battery unit, have 4.0mm thickness and this cell device and covered aluminium lamination by the outside with 0.1mm thickness, and be installed in two open ends of the cylindrical jar that subsides and be welded to shell by protecgulum and the bonnet that resin forming forms, therefore form battery pack.
The cell device that wherein has been connected to circuit board etc. and has had 4.0mm thickness is inserted in the cylindrical jar that subsides by the assembly that the outside covers the composite membrane with 0.05mm thickness, this cylindrical jar that subsides is shaped to rectangular shape by the cylindrical metal pipe with 0.1mm thickness with the manufacturing of the DI method of forming and obtains, and be installed in two open ends of the cylindrical jar that subsides and be welded to shell by protecgulum and the bonnet that resin forming forms, therefore form battery pack.
The cell device that wherein has been connected to circuit board etc. and has had 4.0mm thickness is inserted in the cylindrical jar that subsides by the assembly that the outside covers the composite membrane with 0.05mm thickness, this cylindrical jar that subsides is shaped to rectangular shape by the cylindrical metal pipe with 0.1mm thickness that roller is formed manufactured and obtains, and be installed in two open ends of the cylindrical jar that subsides and be welded to shell by protecgulum and the bonnet that resin forming forms, therefore form battery pack.
Comparative Examples 1
Wherein the assembly that has been connected to battery unit such as circuit board is inserted in the shell molds of making by resin forming, and in this battery unit, the cell device with 4.0mm thickness is covered the aluminium lamination with 0.1mm thickness by the outside, therefore forms battery pack.
Comparative Examples 2
Wherein the assembly that has been connected to battery unit such as circuit board is inserted in the rectangle jar with 0.2mm thickness by the deep-draw manufacturing, and welding battery cover, therefore form battery pack, in this battery unit, the cell device with 4.0mm thickness is covered the aluminium lamination with 0.1mm thickness by the outside.
For each battery pack of above-mentioned manufacturing, measured the volume of the cell device in the volume of battery pack and the battery of packing into, therefore obtain volumetric efficiency by (cell device volume/battery pack volume).
Measurement result is shown in the following Table 1.
From The above results, according to battery pack with such conventional structure, wherein the battery unit of the folded film of outer cover inserts in the resin forming shell, though volumetric efficiency equals 78%, according to battery pack of the present invention, wherein battery unit is inserted through that the metal tube that the DI method of forming or roller are formed manufactured is shaped to rectangular shape and in the shell that obtains, volumetric efficiency is equal to or greater than 92%, and will understand volumetric efficiency and improved greatly.
In these battery pack, according to using cell device outside wherein not cover the battery pack of the battery unit of stacked film, volumetric efficiency equals 95% and can not waste and make battery unit structurally.Therefore, if the external dimensions of shell is made as constant, the size of the battery main body in the shell of then packing into can be amplified and can be increased battery capacity.On the contrary, if battery capacity is made as constant, then battery pack can miniaturization.
The invention is not restricted to above-mentioned two embodiment etc., but in the scope that does not break away from spirit of the present invention, many improvement and application all are possible.Though described the foregoing description at the lithium ion polymer secondary cell that uses gel electrolyte, battery variety is not limited thereto.The present invention also can be applied to use the battery of other kinds of cylindrical shell, for example, uses the cell device of solid electrolyte or liquid electrolyte.
The mounting structure of circuit board 5, protecgulum 6 etc. is not limited to use holding element shown in Figure 14.For example, also can use 2 and 3 structures that inserted and put by circuit board 5 and protecgulum 6 that wherein go between, will be in the lead-in wire 2 and 3 bendings that insert and put between part and the cell device 1, thereby and shell 8 insert extruding protecgulum 6 by pressure, therefore connect shell 8 and protecgulum 6.Nature, the situation that does not cover stacked film shown in Figure 12 in cell device outside shown in Figure 12 also can be used such method.
Claims (31)
1, a kind of battery pack comprises:
Battery unit, cell device is packed in the film shape packing element with insulation property in described battery unit;
Rectangular enclosure constitutes as follows, and after metal material formed cylindrical shape, described cylindrical shape was formed as almost consistent tubular of profile with described cell device, and formed opening portion at two ends; With
A pair of lid is respectively installed to the opening portion of described shell,
Wherein said battery unit is packed in the described shell, and described opening portion is closed by described a pair of cap seal;
Wherein said film shape packing element forms by laminated resin film;
Described film shape packing element is positioned to the outermost resin film of the following scope of 25 μ m and thickness by being positioned at the adhesive bond thickness more than the 10 μ m that the inner layer resin film to the following scope of 35 μ m forms more than the 25 μ m, and
The moisture agent for capturing that is used to absorb moisture is mixed into described adhesive.
2, battery pack according to claim 1, the metal material of wherein said shell is selected from the group that comprises iron, titanium, stainless steel and aluminium.
3, battery pack according to claim 2, the Vickers hardness of wherein said metal material is equal to or greater than 20.
4, battery pack according to claim 2, wherein said aluminium is selected from the group that comprises 3003H18,3004H18 and 1N30-H18.
5, battery pack according to claim 1, wherein said outermost resin film are selected from the group that comprises PETG, nylon, PEN (polyethylene naphthalate), polybutylene terephthalate (PBT) (polybutylene terephthalate).
6, battery pack according to claim 1, wherein said inner layer resin film are selected from the group of polyethylene, ionomer, ethene-methacrylate ester copolymer, ethene-methacrylic acid copolymer and the ethylene-methyl acrylate copolymer of the polypropylene that comprises polypropylene, maleate sex change, polyethylene, maleate sex change.
7, battery pack according to claim 1, wherein said moisture agent for capturing is selected from the group that comprises sulfate or polyacrylate, and the general formula of wherein said sulfate is by MSO
4Or M
2SO
4Expression is at MSO
4In the expression formula, M is selected from Mg and Ca, at M
2SO
4In the expression formula, M is selected from Na, K, and the general formula of polyacrylate is by (CH
2-CH (COOM)-)
nExpression is at (CH
2-CH (COOM)-)
nIn the expression formula, M is selected from Na, K, Mg and Ca, and described moisture agent for capturing is with the mixed in the 10% following scope more than 1%.
8, battery pack according to claim 1, wherein the hydatogenesis film of metal or metal oxide is formed on the outer surface of described at least outermost resin film or on the inner surface of inner layer resin film.
9, battery pack according to claim 1, wherein said shell forms by the DI forming method.
10, battery pack according to claim 1, wherein said shell forms by the roll forming established law.
11, battery pack according to claim 1, wherein circuit board is arranged on the inboard one of at least of described a pair of lid.
12, battery pack according to claim 1, wherein said cell device has gelinite or solid electrolyte.
13, battery pack according to claim 1, wherein, a kind of resin molding is formed on the inner surface of described shell as dielectric film, and described resin molding is selected from the group of polyethylene, ionomer, ethene-methacrylate ester copolymer, ethene-methacrylic acid copolymer and the ethylene-methyl acrylate copolymer of the polypropylene that comprises polypropylene, maleate sex change, polyethylene, maleate sex change.
14, battery pack according to claim 1 is wherein carried out insulation processing to the outer surface of described shell at least.
15, battery pack according to claim 14, wherein said insulation processing are also as design and printing.
16, battery pack according to claim 15, wherein said design and printing prints by laser.
17, a kind of battery pack comprises:
Cell device;
Rectangular enclosure constitutes as follows, and after metal material formed cylindrical shape, described cylindrical shape was formed as almost consistent tubular of external shape with described cell device, and opening portion is formed on two ends; With
A pair of lid is respectively installed to the opening portion of described shell,
Wherein said cell device is loaded in the described shell, and described opening portion is closed by described a pair of cap seal;
The moisture agent for capturing that wherein is used to absorb moisture is mixed into the resin material of described lid.
18, battery pack according to claim 17, the metal material of wherein said shell is selected from the group that comprises iron, titanium, stainless steel and aluminium.
19, battery pack according to claim 18, the Vickers hardness of wherein said metal material is equal to or greater than 20.
20, battery pack according to claim 18, wherein said aluminium is selected from the group that comprises 3003H18,3004H18 and 1N30-H18.
21, battery pack according to claim 17, wherein said shell forms by the DI forming method.
22, battery pack according to claim 17, wherein said shell forms by the roll forming established law.
23, battery pack according to claim 17, wherein circuit board is arranged at least one the inboard of described a pair of lid.
24, battery pack according to claim 17, wherein said lid forms by resin forming.
25, battery pack according to claim 17, wherein said moisture agent for capturing is selected from the group that comprises sulfate or polyacrylate, and the general formula of wherein said sulfate is by MSO
4Or M
2SO
4Expression is at MSO
4In the expression formula, M is selected from Mg and Ca, at M
2SO
4In the expression formula, M is selected from Na, K, and the general formula of polyacrylate is by (CH
2-CH (COOM)-)
nExpression is at (CH
2-CH (COOM)-)
nIn the expression formula, M is selected from Na, K, Mg and Ca, and described moisture agent for capturing is with the mixed in the 10% following scope more than 0.2%.
26, battery pack according to claim 17, wherein said cell device has gelinite or solid electrolyte.
27, battery pack according to claim 17 is wherein carried out insulation processing to the inner surface of described shell at least.
28, battery pack according to claim 27, wherein insulation processing is undertaken by form resin molding on described inner surface of outer cover, and
Described resin molding is selected from the group of polyethylene, ionomer, ethene-methacrylate ester copolymer, ethene-methacrylic acid copolymer and the ethylene-methyl acrylate copolymer of the polypropylene that comprises polypropylene, maleate sex change, polyethylene, maleate sex change.
29, battery pack according to claim 17 is wherein carried out insulation processing to the outer surface of described shell at least.
30, battery pack according to claim 29, wherein said insulation processing are also as design and printing.
31, battery pack according to claim 30, wherein information arrives described design and printing by laser printing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004215097 | 2004-07-23 | ||
| JP215097/2004 | 2004-07-23 | ||
| JP194096/2005 | 2005-07-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1989633A CN1989633A (en) | 2007-06-27 |
| CN100555711C true CN100555711C (en) | 2009-10-28 |
Family
ID=38185481
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800249282A Expired - Fee Related CN100555711C (en) | 2004-07-23 | 2005-07-22 | Battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100555711C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2212940B1 (en) * | 2007-11-23 | 2015-02-25 | LG Chem, Ltd. | Secondary battery pack providing excellent productivity and structural stability |
| US20090291330A1 (en) * | 2008-04-24 | 2009-11-26 | Boston-Power, Inc. | Battery with enhanced safety |
| JP5329126B2 (en) * | 2008-05-27 | 2013-10-30 | Ｊｆｅスチール株式会社 | Aqueous coolant for DI molding of laminated metal plate and DI molding method of laminated metal plate |
| JP5830926B2 (en) * | 2010-05-31 | 2015-12-09 | 日産自動車株式会社 | Thin battery |
| JP5773412B2 (en) * | 2011-03-31 | 2015-09-02 | Ｎｅｃエナジーデバイス株式会社 | Battery pack and electric bicycle |
| CN105789502A (en) * | 2014-12-23 | 2016-07-20 | 比亚迪股份有限公司 | Battery module housing and preparation method thereof, battery module, battery pack and electric vehicle |
| KR102334141B1 (en) * | 2017-10-31 | 2021-12-02 | 주식회사 엘지에너지솔루션 | Secondary Battery Comprising Battery Case Formed by Injection Molding |
| CN115566327B (en) * | 2022-09-26 | 2023-07-11 | 楚能新能源股份有限公司 | Cladding device and cladding method for lithium battery insulating film |
-
2005
- 2005-07-22 CN CNB2005800249282A patent/CN100555711C/en not_active Expired - Fee Related
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| CN1989633A (en) | 2007-06-27 |
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