CN103824986B - Flexible battery group and manufacture method thereof - Google Patents
Flexible battery group and manufacture method thereof Download PDFInfo
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- CN103824986B CN103824986B CN201410105264.3A CN201410105264A CN103824986B CN 103824986 B CN103824986 B CN 103824986B CN 201410105264 A CN201410105264 A CN 201410105264A CN 103824986 B CN103824986 B CN 103824986B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention provides a kind of flexible battery group and manufacture method thereof.Described flexible battery group comprises: aluminum plastic film, and broad ways is provided with multiple punching hole; Multiple battery, compartment of terrain and be arranged at aluminum plastic film hermetically rush in hole, the electrolyte that each battery has battery core, positive pole ear and negative lug and injects, the positive pole ear of described multiple battery links together, and the negative lug of described multiple battery links together; And silica gel, hermetically and full being arranged at filling is rushed in hole between two adjacent batteries, mutually isolated between adjacent silica gel and battery.The tired situation that the employing of silica gel can avoid unbalanced stress to cause; Punching hole is used to carry out built-in silica gel, silica gel not only can be avoided to misplace in follow-up pumping process causes flexible battery group to lose efficacy, more advantageously there is fabulous facilitation in punching hole to Stress Release during silica gel flexural deformation, thus improves the fail safe of flexible battery group.
Description
Technical field
The present invention relates to field of batteries, particularly relate to a kind of flexible battery group and manufacture method thereof.
Background technology
Because lithium ion battery has plurality of advantages, such as voltage is high, volume is little, quality is light, specific capacity is high, memory-less effect, pollution-free, self discharge is little and have extended cycle life, make it obtain unprecedented development in the application of field of mobile equipment, comprise mobile phone, video camera, notebook computer and other portable electronics etc.Along with to the technological development of mobile convenience devices and the growth of its demand, as the demand sharp increase of the secondary cell of the energy.In such secondary cell, the research of the lithium secondary battery with high-energy-density and discharge voltage is extensively carried out, is obtained extensive use at present.
Along with the inclination of consumer, electronic equipment is tending towards miniaturized, slimming gradually.In this type of battery design, need the shape making battery to realize variation with the shape of equipment, and need the inner space effectively using equipment, therefore many batteries need to have flexible mode and design.
The U.S. Patent Application Publication No. 2013/0171490A1 announced July 4 in 2013 discloses a kind of flexible battery group, by upper and lower lamination by a series of battery-arrangements, and battery is isolated upper and lower adhesion layer bonding by the adhesive between battery, thus prepare flexible battery group.But the flexible battery group of this design is when bending, due to top layers and bottom layer rigid comparatively strong, affected by force, bending degree and the fatigue resistance of flexible battery group are very restricted, and affect the performance of flexible battery group performance; Binding agent is after certain angle of bend and number of bends, and adhesive strength can decline, and causes its fixing to be deteriorated, and easy produces fatigue in the adhesive free region close with binding agent because active force is inconsistent, risky to the security performance of flexible battery group.And the method needs to control the adhesive strength of adhesive and the homogeneous of each region use amount, and the difficulty of volume production is very large.
Summary of the invention
In view of Problems existing in background technology, the object of the present invention is to provide a kind of flexible battery group and manufacture method thereof, it can improve the crooking ability of flexible battery group.
Another object of the present invention is to provide a kind of flexible battery group and manufacture method thereof, it can improve the fail safe of flexible battery group.
To achieve these goals, in first aspect, the invention provides a kind of flexible battery group, it comprises: aluminum plastic film, and broad ways is provided with multiple punching hole; Multiple battery, compartment of terrain and be arranged at aluminum plastic film hermetically rush in hole, the electrolyte that each battery has battery core, positive pole ear and negative lug and injects, the positive pole ear of described multiple battery links together, and the negative lug of described multiple battery links together; And silica gel, hermetically and full being arranged at filling is rushed in hole between two adjacent batteries, mutually isolated between adjacent silica gel and battery.
To achieve these goals, in second aspect, the invention provides a kind of manufacture method of flexible battery group, for the manufacture of flexible battery group described according to a first aspect of the present invention, it comprises step: aluminum plastic film is arranged in the direction of the width multiple punching hole along side; Battery core compartment of terrain is positioned in punching hole, between two adjacent battery cores, leaves a punching hole; Be positioned over while silica gel is completely filled and rush in hole between two adjacent battery cores; By the opposite side of aluminum plastic film to this side doubling, so that the battery core be positioned in corresponding punching hole and silica gel are covered; The aluminum plastic film at the both sides place vertical with doubling direction in each punching hole is carried out side seal, and mutually isolated to make between adjacent battery and silica gel, the region of doubling forms airbag; Electrolyte is injected from the top rushing hole being placed with battery core after side seal; Closedtop is carried out to the hole that rushes injecting electrolyte; Battery core after closedtop is changed into; After changing into, encapsulation is vacuumized to airbag, to make battery; Carry out underseal, excision airbag; And the positive pole ear set by multiple battery is connected together, the negative lug set by multiple battery is connected together.
Beneficial effect of the present invention is as follows:
The silica gel that flexible battery group of the present invention adopts is extremely flexible material, and its pliability and fatigue resistance greatly, can avoid the tired situation that unbalanced stress causes; Use punching hole to carry out built-in silica gel simultaneously, silica gel not only can be avoided to misplace in follow-up pumping process causes flexible battery group to lose efficacy, thus realize locating and be applicable to actual production operation, more advantageously there is fabulous facilitation in punching hole to Stress Release during silica gel flexural deformation, thus improves the fail safe of flexible battery group.
Accompanying drawing explanation
Fig. 1 is the stereogram that flexible battery group according to the present invention arranges punching hole on aluminum plastic film;
Fig. 2 is the stereogram of flexible battery group according to the present invention after battery core and silica gel are placed in position, punching hole;
Fig. 3 is according to the stereogram of flexible battery group of the present invention after aluminum plastic film doubling;
Fig. 4 is the stereogram of flexible battery group according to the present invention at aluminum plastic film side seal and after forming airbag;
Fig. 5 is flexible battery group according to the present invention injecting electrolyte, aluminum plastic film closedtop, battery core changes into, airbag vacuumizes, aluminum plastic film underseal stereogram after excising airbag, and wherein for the sake of clarity, battery core illustrates with solid line and electrolyte illustrates with interstitial wire;
Fig. 6 is the stereogram that positive pole ear connects together and negative lug connects together of the battery core of flexible battery group according to the present invention in multiple punching being cheated, and wherein for the sake of clarity, battery core illustrates with solid line and electrolyte illustrates with interstitial wire;
Wherein, description of reference numerals is as follows:
1 aluminum plastic film E electrolyte
2 rush hole 4 silica gel
3 battery G airbags
31 battery core L length directions
P positive pole ear W Width
N negative lug T thickness direction
Embodiment
Describe in detail with reference to the accompanying drawings according to flexible battery group of the present invention and manufacture method thereof.
First flexible battery group is according to a first aspect of the present invention described.
Following in the explanation of flexible battery group and each assembly thereof, L represents length direction, and W represents Width, and T represents thickness direction.
Referring to figs. 1 through Fig. 6, flexible battery group according to the present invention comprises: aluminum plastic film 1, and broad ways W is provided with multiple punching hole 2; Multiple battery 3, compartment of terrain and be arranged at aluminum plastic film 1 hermetically rush in hole 2, the electrolyte E that each battery 3 has battery core 31, positive pole ear P and negative lug N and injects, the positive pole ear P of described multiple battery 3 links together, and the negative lug N of described multiple battery 3 links together; And silica gel 4, hermetically and full being arranged at filling is rushed in hole 2 between two adjacent batteries 3, mutually isolated between adjacent silica gel 4 and battery 3.Here it should be added that, " full filling " refers to silica gel 4 and fills rushing hole 2 completely, and after filling completely, the surface of silica gel 4 with the near coal-mine residing planes align rushing hole 2, also can exceed the near coal-mine residing plane of rushing hole 2.
Silica gel is arranged in punching hole the consistency of Stress Release when effectively can control the flexural deformation of flexible battery group with completely filling, and is conducive to Reducing distortion to the yield stress caused between adjacent two batteries.
Flexible battery group of the present invention due to the silica gel adopted be extremely flexible material, thus its pliability and fatigue resistance large, the tired situation that unbalanced stress causes can be avoided; Use punching hole to carry out built-in silica gel simultaneously, silica gel not only can be avoided to misplace in follow-up pumping process causes flexible battery group to lose efficacy, thus realize locating and be applicable to actual production operation, more advantageously there is fabulous facilitation in punching hole to Stress Release during silica gel flexural deformation, thus improves the fail safe of flexible battery group.
Flexible battery group of the present invention can be applied on watchband, ornament, wearable dress ornament, easy to carry, slim and graceful.
In an embodiment of aluminum plastic film 1, aluminum plastic film 1 can be nylon-Al-PP three-decker.
In an embodiment of flexible battery group according to the present invention, rush the length 2mm at least larger than the length of battery 3 in hole 2, rush the width 1.5mm at least larger than the width of battery 3 in hole 2, rush the thickness extremely when young 0.4mm of the Thickness Ratio battery 3 in hole 2; Adjacent two spacing of rushing between hole 2 are at least greater than 1.2mm.Rushing hole 2 wider than battery 3 and longer, is battery core 31 can be put into ensure, and leaves space to the cell expansion caused that circulates; Rushing hole 2 Thickness Ratio battery core 31 less, is in order to (underseal, closedtop, side seal all complete) makes battery core 31 and aluminum plastic film 1 fit tighter after packaging, makes the exterior contour of the entirety of flexible battery group better, prevents battery 3 to be out of shape.
In an embodiment of flexible battery group according to the present invention, surface and the near coal-mine residing planes align (thickness of the silica gel 4 after in other words, completely filling equals to rush the thickness in hole 2) rushing hole 2 of the silica gel 4 after arranging to full filling.In another embodiment, the surface of the silica gel 4 after arranging to full filling exceeds the near coal-mine residing plane (thickness of the silica gel 4 in other words, after full filling is greater than the thickness rushing hole 2) of rushing hole 2.In another embodiment, (in other words the surface of the silica gel 4 after arranging to full filling flushes with the surface being in the same side being arranged on the battery 3 rushed in hole 2, the thickness of the silica gel 4 after full filling equals the thickness of battery 3), thus (underseal, closedtop, side seal all complete) fits tighter after making aluminum plastic film 1 encapsulate, make the exterior contour of the entirety of flexible battery group better, prevent battery 3 to be out of shape.
In an embodiment of flexible battery group according to the present invention, the water content that interval is put into the battery core 31 of rushing in hole 2 is not more than 300ppm.Water content be less than 300ppm be in order to prevent battery core 31 in formation process aerogenesis too much (Li can with enough water generated reactive gas) cause the softened destruction in interface, affect the flexibility of battery.
In an embodiment of flexible battery group according to the present invention, battery core 31 can be takeup type, stacked or spooled laminations is hybrid.
In an embodiment of flexible battery group according to the present invention, battery core 31 can be cobalt acid lithium and graphite system, LiFePO4 and graphite system, is certainly not limited thereto, the system that battery core 31 can select any suitable positive active material and negative electrode active material to form.
In an embodiment of flexible battery group according to the present invention, electrolyte E can be containing lithium salts LiPF
6liquid state, gel, one in solid-state electrolytic solution.
In an embodiment of silica gel 4, the shore hardness of silica gel 4 is not more than 35D, and hot strength is 4.0MPa-12.5MPa.
Secondly the manufacture method of flexible battery group is according to a second aspect of the present invention described.
According to the manufacture method of flexible battery group of the present invention for the manufacture of flexible battery group according to a first aspect of the present invention, it comprises step: aluminum plastic film 1 is arranged on Width W multiple punching hole 2 (with reference to Fig. 1) along side; Being positioned over battery core 31 compartment of terrain rushes in hole 2, leaves one and rush hole 2 between two adjacent battery cores 31; Full for silica gel 4 being positioned over filling is rushed (with reference to Fig. 2) in hole 2 between two adjacent battery cores 31; By the opposite side of aluminum plastic film 1 to this side doubling, to rush battery core 31 in hole 2 and silica gel 4 covers (with reference to Fig. 3) by being positioned over correspondence; The aluminum plastic film 1 at the both sides place vertical with doubling direction in each punching hole 2 is carried out side seal, doubling region forms airbag G (namely corresponding each rush hole 2 all have an airbag G), to make mutually isolated between adjacent battery 3 and silica gel 4 (reference Fig. 4); Electrolyte E is injected from the top rushing hole 2 being placed with battery core 31 after side seal; Closedtop (with reference to Fig. 4) is carried out to the hole 2 that rushes injecting electrolyte E; Battery core 31 after closedtop is changed into; After changing into, encapsulation is vacuumized to airbag G, to make battery 3; Carry out underseal, excision airbag G (with reference to Fig. 5); And the positive pole ear P set by multiple battery 3 is connected together, the negative lug N set by multiple battery 3 is connected together (with reference to Fig. 6), to form flexible battery group.
Wherein, by the step that positive pole ear P connects together and negative lug N connects together of multiple battery 3 can before or after the step of carrying out underseal excision airbag G, also can before injecting the step of electrolyte E from the top rushing hole 2 being placed with battery core 31 after side seal.
In the manufacture method of flexible battery group according to the present invention, the length of the airbag G that aluminum plastic film 1 is formed is not less than 4cm.
In the manufacture method of flexible battery group according to the present invention, side seal temperature is 165 DEG C ~ 195 DEG C, the side seal time is 2s ~ 20s, side seal pressure is 0.2MPa ~ 1MPa.
In the manufacture method of flexible battery group according to the present invention, closedtop temperature is 165 DEG C ~ 195 DEG C, the closedtop time is 2s ~ 20s, closedtop pressure is 0.2MPa ~ 1MPa.
In the manufacture method of flexible battery group according to the present invention, the pumpdown time vacuumizing encapsulation is 2s ~ 30s, vacuum degree≤-97KPa, encapsulation pressure is 0.1MPa ~ 1.2MPa, package temperature is 165 DEG C ~ 195 DEG C.
Following explanation is according to the embodiment of the manufacture method of flexible battery group of the present invention, test process and test result.
Embodiment 1 (set-up mode referring to figs. 1 through Fig. 6)
Aluminum plastic film 1 arranges 11 rush hole 2 (wherein 6 are rushed hole 2 for arranging battery core 31,5 are rushed hole 2 for arranging silica gel 4), rush the length 2mm larger than the length of battery core 31 in hole 2, rush the width 1.5mm larger than the width of battery core 31 in hole 2, rush the little 0.4mm of thickness of the Thickness Ratio battery core 31 in hole 2; Adjacent two spacing of rushing between hole 2 are 1.2mm.Then be that battery core 31 compartment of terrain of 300ppm is put into and rushes in hole 2 by water content, again full for silica gel 4 being positioned over filling is rushed in hole 2 between two adjacent battery cores 31, the large 0.4mm of thickness in the thickness specific impulse hole 2 of the silica gel 4 after full filling, the shore hardness of silica gel 4 is 35D, and hot strength is 12.5MPa.By the opposite side of aluminum plastic film 1 to this side doubling, leave the airbag G length of 4cm, and carry out side seal to each punching hole 2, side seal temperature is 195 DEG C, the side seal time is 20s, side seal pressure is 1MPa; Inject containing lithium salts LiPF
6carry out closedtop with after the liquid electrolyte of solvent ethylene carbonate, closedtop temperature is 195 DEG C, the closedtop time is 20s, closedtop pressure is 1MPa.Then battery core 31 is changed into, then encapsulation is vacuumized to the airbag G that aluminum plastic film 1 is formed, the pumpdown time is 30s, vacuum degree is-97KPa, encapsulation pressure is 1.2MPa, package temperature is 195 DEG C.Finally carry out underseal, airbag G excised, and the positive pole ear P of battery 3 is connected together, negative lug N connects together.
Embodiment 2 (set-up mode referring to figs. 1 through Fig. 6)
Aluminum plastic film 1 is arranged and rushes hole 2 (wherein 6 are rushed hole 2 for arranging battery core 31,5 are rushed hole 2 for arranging silica gel 4), rush the length 3mm larger than the length of battery core 31 in hole 2, rush the width 2.5mm larger than the width of battery core 31 in hole 2, rush the little 0.5mm of thickness of the Thickness Ratio battery core 31 in hole 2; Adjacent two spacing of rushing between hole 2 are 1.3mm.Then be that battery core 31 compartment of terrain of 250ppm is put into and rushes in hole 2 by water content, again full for silica gel 4 being positioned over filling is rushed in hole 2 between two adjacent battery cores 31, the large 0.5mm of thickness in the thickness specific impulse hole 2 of the silica gel 4 after full filling, the shore hardness of silica gel 4 is 25D, and hot strength is 4.0MPa.By the opposite side of aluminum plastic film 1 to this side doubling, leave the airbag G length of 5cm, and carry out side seal to each punching hole 2, side seal temperature is 165 DEG C, the side seal time is 2s, side seal pressure is 0.2MPa; Inject containing lithium salts LiPF
6carry out closedtop with after the gel electrolyte of solvent propylene carbonate, closedtop temperature is 165 DEG C, the closedtop time is 2s, closedtop pressure is 0.2MPa.Then battery core 31 is changed into, then encapsulation is vacuumized to the airbag G of battery core 31, the pumpdown time is 2s, vacuum degree is-98KPa, encapsulation pressure is 0.1MPa, package temperature is 165 DEG C.Finally carry out underseal, airbag G excised, and the positive pole ear P of battery 3 is connected together, negative lug N connects together.
Embodiment 3 (set-up mode referring to figs. 1 through Fig. 6)
Aluminum plastic film 1 is arranged and rushes hole 2 (wherein 6 are rushed hole 2 for arranging battery core 31,5 are rushed hole 2 for arranging silica gel 4), rush the length 2.5mm larger than the length of battery core 31 in hole 2, rush the width 2mm larger than the width of battery core 31 in hole 2, rush the little 0.45mm of thickness of the Thickness Ratio battery core 31 in hole 2; Adjacent two spacing of rushing between hole 2 are 1.4mm.Then be that battery core 31 compartment of terrain of 200ppm is put in punching hole by water content, again full for silica gel 4 being positioned over filling is rushed in hole 2 between two adjacent battery cores 31, the large 0.45mm of thickness in the thickness specific impulse hole 2 of the silica gel 4 after full filling, the shore hardness of silica gel is 15D, and hot strength is 10.0MPa.By the opposite side of aluminum plastic film 1 to this side doubling, leave the airbag G length of 4.5cm, and carry out side seal to each punching hole 2, side seal temperature is 180 DEG C, the side seal time is 10s, side seal pressure is 0.6MPa; Inject containing lithium salts LiPF
6solid-state electrolytic solution after carry out closedtop, closedtop temperature is 180 DEG C, the closedtop time is 10s, closedtop pressure is 0.6MPa.Then battery core 31 is changed into, then encapsulation is vacuumized to the airbag G of battery core 31, the pumpdown time is 16s, vacuum degree is-99KPa, encapsulation pressure is 0.6MPa, package temperature is 180 DEG C.Finally carry out underseal, airbag G excised, and the positive pole ear P of battery 3 is connected together, negative lug N connects together.
Comparative example 1
(spacing distance between adjacent two batteries of the spacing distance between adjacent two batteries and embodiment 1 (namely adjacent two rush cheat) is identical to arrange at aluminum plastic film battery that 6 water contents are 300ppm along interval on Width W, side, but battery is herein resultant battery), by the opposite side of aluminum plastic film to this side doubling, interval between adjacent two batteries is provided with polyvinylpyrrolidone (PVP) binding agent with completely filling, the thickness of bonding agent is identical with the thickness of battery thus make to isolate between adjacent two batteries, this side of aluminum plastic film and opposite side stick together by same polyvinylpyrrolidone bonding agent, finally the positive pole ear of battery is connected together, negative lug connects together.
Comparative example 2
At aluminum plastic film, the battery core (spacing distance between adjacent two battery cores is identical with embodiment 1) that 6 water contents are 300ppm is set along interval on Width W, side, be positioned over again silica gel completely being filled between two adjacent battery cores and (namely compare embodiment 1, comparative example 2 is without punching hole), the thickness of silica gel is identical with the thickness of battery core, the shore hardness of silica gel is 35D, and hot strength is 12.5MPa.By the opposite side of aluminum plastic film to this side doubling, leave the airbag length of 4cm, and carry out side seal to each battery core, side seal temperature is 195 DEG C, the side seal time is 20s, side seal pressure is 1MPa; Inject containing lithium salts LiPF
6carry out closedtop with after the liquid electrolyte of solvent ethylene carbonate, closedtop temperature is 195 DEG C, the closedtop time is 20s, closedtop pressure is 1MPa.Then battery core is changed into, then encapsulation is vacuumized to the airbag that aluminum plastic film is formed, the pumpdown time is 30s, vacuum degree is-97KPa, encapsulation pressure is 1.2MPa, package temperature is 195 DEG C.Finally airbag is excised, and the positive pole ear of battery is connected together, negative lug connects together.
Test process
Respectively by the flexible battery group # in embodiment 1-3 and comparative example 1-2, number consecutively is S1-S5.Bending and volume test are carried out to S1-S5.
Capacity test method is: first flexible battery group is left standstill 3min; Then with the charging current constant current charge of 0.5C to 4.3V, then constant voltage charge is to 0.05C, obtains charging capacity AGC0; Leave standstill 3min; Discharge capacity D0 is first obtained to 3.0V again with the discharging current constant-current discharge of 0.5C; Volume test is completed after leaving standstill 3min
Crooked test method is: bent each for flexible battery group silica gel position, and angle of bend carries out from 0 DEG C ~ 180 DEG C, and bending number of times is 800 times.Finally observe flexible battery group whether be out of shape and break, and test the capacity after bending.
Table 1 gives the volume test of embodiment 1-3 and comparative example 1-2 and the test result of crooked test.Wherein, the single battery model of embodiment 1 and comparative example 1-2 is 323472, convoluted, and material is cobalt acid lithium and graphite, and electrolyte is for containing lithium salts LiPF
6with the liquid electrolyte of solvent ethylene carbonate; The single battery model of embodiment 2 is 284069, convoluted, and material is LiFePO4 and graphite, and electrolyte is for containing lithium salts LiPF
6with the gel electrolyte of solvent propylene carbonate; The single battery model of embodiment 3 is 204060, laminated type, and material is LiFePO4 and graphite, and electrolyte is for containing lithium salts LiPF
6solid-state electrolytic solution.
The test result of table 1 volume test and crooked test
As can be seen from Table 1, after crooked test, the capacity of S1-S3 does not significantly change, and the situation generation that flexible battery group is not out of shape and is broken.Illustrate and adopt the method, crooking ability and the good flexible battery group of fail safe can be made, and very applicable actual production operation.
Although the capacity of S4 and S5 does not have significant change yet, but S4 there occurs distortion, be mainly aluminum plastic film to crumple, illustrate and adopt binding agent bonding levels aluminum plastic film that the position of bonding can be made to be subject to larger stress relative to non-adherent position, the risk causing it to be out of shape increases; And S5 there occurs and breaks, main positions, at the position place, four angles being filled with silica gel, illustrates that not rushing the built-in silica gel in hole is unfavorable for Stress Release.And have punching hole built-in silica gel all do not deform and break, its to the safety of flexible battery group and pliability effect best, be conducive to actual production and carry out.
Claims (10)
1. a flexible battery group, is characterized in that, comprising:
Aluminum plastic film (1), broad ways (W) is provided with multiple punching hole (2);
Multiple battery (3), compartment of terrain and be arranged at aluminum plastic film (1) hermetically rush in hole (2), the electrolyte (E) that each battery (3) has battery core (31), positive pole ear (P) and negative lug (N) and injects, the positive pole ear (P) of described multiple battery (3) links together, and the negative lug (N) of described multiple battery (3) links together; And
Silica gel (4), hermetically and full being arranged at filling is rushed in hole (2) between two adjacent batteries (3), mutually isolated between adjacent silica gel (4) and battery (3).
2. flexible battery group according to claim 1, is characterized in that,
The length 2mm at least larger than the length of battery core (31) of punching hole (2), the width 1.5mm at least larger than the width of battery core (31) of punching hole (2), the thickness extremely when young 0.4mm of the Thickness Ratio battery core (31) of punching hole (2);
Spacing between adjacent two punchings hole (2) is more than or equal to 1.2mm.
3. flexible battery group according to claim 1, is characterized in that, the water content of the battery (3) that interval is put in punching hole (2) is not more than 300ppm.
4. flexible battery group according to claim 1, is characterized in that, the shore hardness of silica gel (4) is not more than 35D.
5. flexible battery group according to claim 1, is characterized in that, the hot strength of silica gel (4) is 4.0MPa-12.5MPa.
6. a manufacture method for flexible battery group, for the manufacture of the flexible battery group according to any one of claim 1-5, is characterized in that, comprise step:
Aluminum plastic film (1) is arranged on Width (W) multiple punching hole (2) along side;
Battery core (31) compartment of terrain is positioned in punching hole (2), between two adjacent battery cores (31), leaves punching hole (2);
Full for silica gel (4) being positioned over filling is rushed in hole (2) between two adjacent battery cores (31);
By the opposite side of aluminum plastic film (1) to this side doubling, so that battery core (31) in corresponding punching hole (2) and silica gel (4) covering will be positioned over;
The aluminum plastic film (1) at the both sides place vertical with doubling direction of each punching hole (2) is carried out side seal, mutually isolated to make between adjacent battery (31) and silica gel (4), the region of doubling forms airbag (G);
Electrolyte (E) is injected from the top rushing hole (2) being placed with battery core (31) after side seal;
Closedtop is carried out to the hole (2) that rushes injecting electrolyte (E);
Battery core (31) after closedtop is changed into;
After changing into, encapsulation is vacuumized to airbag (G), to make battery (3);
Carry out underseal, excision airbag (G); And
The set positive pole ear (P) of multiple battery (3) is connected together, the set negative lug (N) of multiple battery (3) is connected together.
7. the manufacture method of flexible battery group according to claim 6, is characterized in that, the length of the airbag (G) of the formation of aluminum plastic film (1) is not less than 4cm.
8. the manufacture method of flexible battery group according to claim 6, is characterized in that, side seal temperature is 165 DEG C ~ 195 DEG C, the side seal time is 2s ~ 20s, side seal pressure is 0.2MPa ~ 1MPa.
9. the manufacture method of flexible battery group according to claim 6, is characterized in that, closedtop temperature is 165 DEG C ~ 195 DEG C, the closedtop time is 2s ~ 20s, closedtop pressure is 0.2MPa ~ 1MPa.
10. the manufacture method of flexible battery group according to claim 6, is characterized in that, the pumpdown time vacuumizing encapsulation is 2s ~ 30s, vacuum degree≤-97KPa, encapsulation pressure is 0.1MPa ~ 1.2MPa, package temperature is 165 DEG C ~ 195 DEG C.
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| WO2015181666A1 (en) * | 2014-05-29 | 2015-12-03 | Semiconductor Energy Laboratory Co., Ltd. | Secondary battery and electronic device |
| JP6822048B2 (en) * | 2016-10-12 | 2021-01-27 | 株式会社Ｇｓユアサ | Power storage device |
| CN106654144B (en) * | 2016-12-23 | 2019-07-30 | 天津力神电池股份有限公司 | The special-shaped airbag and its manufacture craft of polymer Li-ion battery |
| CN109103494A (en) * | 2018-07-24 | 2018-12-28 | 安普瑞斯（无锡）有限公司 | A kind of flexible polymer Li-ion battery group |
| CN111403634A (en) * | 2020-03-27 | 2020-07-10 | 湖北亿纬动力有限公司 | Soft package battery and manufacturing method thereof |
| CN111653817A (en) * | 2020-06-16 | 2020-09-11 | 深圳信达新能源科技有限公司 | Preparation method of flexible battery pack and prepared flexible battery pack |
| CN112736293A (en) * | 2020-12-30 | 2021-04-30 | 惠州市惠德瑞锂电科技股份有限公司 | Preparation method of soft package lithium metal battery |
| CN113794010B (en) * | 2021-09-09 | 2023-09-19 | 嘉兴极展科技有限公司 | Flexible stretchable battery pack |
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| CN202111160U (en) * | 2011-05-26 | 2012-01-11 | 东莞市利赛奥新能源科技有限公司 | Packaging film and portable multifunctional combined flexible package lithium ion battery equipped therewith |
| US9343716B2 (en) * | 2011-12-29 | 2016-05-17 | Apple Inc. | Flexible battery pack |
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