CN104600236A - Heavy-current lithium-ion battery pack - Google Patents
Heavy-current lithium-ion battery pack Download PDFInfo
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- CN104600236A CN104600236A CN201510036431.8A CN201510036431A CN104600236A CN 104600236 A CN104600236 A CN 104600236A CN 201510036431 A CN201510036431 A CN 201510036431A CN 104600236 A CN104600236 A CN 104600236A
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 36
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910052802 copper Inorganic materials 0.000 claims abstract description 52
- 239000010949 copper Substances 0.000 claims abstract description 52
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 50
- 238000009413 insulation Methods 0.000 claims abstract description 32
- 238000003466 welding Methods 0.000 claims abstract description 24
- 229920001342 Bakelite® Polymers 0.000 claims abstract description 4
- 239000004637 bakelite Substances 0.000 claims abstract description 4
- 238000002955 isolation Methods 0.000 claims description 29
- 238000002788 crimping Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 5
- 239000004519 grease Substances 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 241000168254 Siro Species 0.000 claims description 4
- 238000009987 spinning Methods 0.000 claims description 4
- 238000004880 explosion Methods 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000003825 pressing Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 15
- 229910052751 metal Inorganic materials 0.000 description 15
- 238000010586 diagram Methods 0.000 description 13
- 230000002159 abnormal effect Effects 0.000 description 9
- 230000001413 cellular effect Effects 0.000 description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 5
- 239000011257 shell material Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 210000005069 ears Anatomy 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 125000005375 organosiloxane group Chemical group 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Classifications
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
-
- 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
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/383—Flame arresting or ignition-preventing means
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention discloses a heavy-current lithium-ion battery pack, which comprises a plurality of battery module groups, wherein positive electrodes and negative electrodes of cells of the battery module groups are respectively connected with one another through a heavy-current connecting plate; the heavy-current connecting plate comprises a straight-line-shaped copper sheet with a row of round holes, and H-shaped nickel plates; each H-shaped nickel plate is welded between every two adjacent round holes; a plurality of line pressing holes and corresponding connecting line cores are formed in and are arranged on a connection terminal between the battery modules; the straight-line-shaped holes are tightly connected with the corresponding connecting line cores in a welding-pressing-welding manner; insulating plates at two ends of the positives and the negatives of the cells of the battery module groups are bakelite plates with a plurality of round holes; and a heat-conducting explosion-proof insulation sheet is arranged one surface, towards the positive electrodes and the negative electrodes of the cells, of the each insulating plate. According to the heavy-current lithium-ion battery pack, the problem of circuit heating in heavy-current charge and discharge is solved; the contact area between the connection terminal and a wire rod is increased; the connection temperature is reduced; and the insulating plates and the heat-conducting explosion-proof insulation sheets can release pressure when the batteries abnormally work, so as to avoid explosion and fire of batteries. The battery pack disclosed by the invention is safe, reliable and long in service life.
Description
Technical field
The present invention relates to cell art, be specifically related to a kind of big current Li-ion batteries piles.
Background technology
Existing big current Li-ion batteries piles, generally include a plurality of group of battery modules of being synthesized by group of battery modules, a plurality of battery cores of each group of battery modules are connected in parallel by brace, be connected in series by splicing ear, connecting line between group of battery modules, battery pack battery core both positive and negative polarity both sides are provided with insulation board.The battery module of battery pack, series connection between group of battery modules both positive and negative polarity, be connected in parallel and adopt sheet metal jag to carry out resistance welded, for guaranteeing brace fastness, usual sheet metal is all thicker, thickness reaches more than 0.4mm, in order to ensure weld strength, all need to adopt high-power welding machine to export macro-energy ability firm welding, welding machine output energy is large, and solder side produces more heat, battery core may be damaged, cause certain potential safety hazard, therefore the solder side that battery is corresponding also needs thicker metal level, namely the welding one side of single battery core shell need increase thickness of shell (such as sometimes needing to increase more than 1.0mm), which adds the weight of monomer battery core, because battery pack uses the mode of single battery core many series connection multi-parallel to assemble, therefore the weight of battery also increases thereupon, the metal level thickeied occupies the space of effective chemical analysis of battery, thus the available capacity of battery under reducing same volume, it also reduce the energy density of battery pack, because the density of metal is much larger compared with the density of the chemical analysis in battery, therefore the battery of same volume also adds the weight of battery because outer cover metal thickeies simultaneously, connection metal sheet is the alloy such as nickel sheet or nickel alloy, because its resistance value is comparatively large, therefore super-high-current ability is poor, simultaneously because sheet metal covers battery connecting surface, sheet metal that this connects when inside battery is abnormal has blocked battery relief valve, and battery such as may to be blasted at the phenomenon.
Meanwhile, existing big current Li-ion batteries piles splicing ear and connecting line adopt the direct welding of a terminal line or the direct mode crimped to be connected usually.The mode of direct crimping is to connect in splicing ear that the end of a thread is insert molded, and then the punching press of external application stamping die, makes the connected mode with connecting line physical contact after splicing ear stress deformation.The mode of this kind of crimping because of wire rod metal core be round, after extruding, single core all can be subject to physical damnification in various degree, causes core intensity greatly to weaken, and the mechanical tensile forces intensity of whole splicing ear is also under pressure and the impact of the tension intensity of core own.Although be squeezed distortion between different core, but still there is a fixed gap between core, Long-Time Service is easier to oxidation, contact resistance is directly caused to become large after terminal oxidation, during overcurrent, caloric value increases, overcurrent capability and tension intensity greatly reduce thereupon, and therefore directly the mode of crimping is shorter for useful life.Also has a kind of mode of direct welding, normally wire rod and sheet metal are directly connected by soldering mode for they, this kind of connected mode because of the intensity of tin weak relative to copper metal many, be connected because sheet metal and wire rod only lean on tin to wrap up, the tension intensity of whole terminal also can be much little simultaneously.For connecting line, because tin is oxidizable in atmosphere, adopt the mode of a terminal line, during super-high-current, wire rod can omit slightly, and wire rod is easily damaged when bending, and two batteries of connection also can be made when folding force is larger stressed, thus the performance that impact is overall.In addition, the connected mode of a terminal line, total contact area is also much little than the mode of multi-thread multiple pressure string holes, under the condition of identical wire diameter, article one, when the line wire diameter of adding up than many lines is identical, caloric value is larger more concentrated, during overcurrent, temperature is higher, thus greatly shortens the useful life of battery.No matter because of above-mentioned reason, adopt the connected mode of a terminal line, be independent crimping or independent welding, is not all suitable for the outdoor equipment of requirement Long-Time Service or uses with the connection of lithium battery.
Have again, in existing big current Li-ion batteries piles, six faces of single battery module group are packaged as a whole with shell usually, the battery core of group of battery modules and external insulation are insulated, this shell plays the effect of insulation and fixing multiple battery module, shell material used is generally plastics, and heat during normal battery operation is difficult to scatter, and needs the heat abstractor increasing the modes such as air-cooled or water-cooled in addition, increase these devices and will increase the weight of battery, increase the failure rate of battery.When battery normally uses because of cell package in the plastic, the bad battery temperature that directly causes that dispels the heat raises, and greatly affects battery, increases cost of equipment maintenance and use cost.Because of non air exit hole when battery is abnormal, battery heat radiation is bad, and battery temperature raises and will directly cause battery to shorten, and battery also probably Yin Gaowen and on fire from explosion, damage equipment causes fire.
Summary of the invention
The object of the present invention is to provide a kind of big current Li-ion batteries piles, its brace can strengthen bonding strength, increase the ability of overcurrent, solve the heating problem of heavy-current discharge, improve the safety dumping of the inside battery air pressure under battery pack power density and battery abnormal conditions, strengthen global reliability and the safety issue of battery.
Simultaneously, for the defect existed in prior art, another object of the present invention is to provide a kind of lithium ion battery big current splicing ear, can bonding strength, toughness and contact area between splicing thread and terminal, reduce contact resistance value and caloric value, thus improve overall overcurrent capability, and it has rational in infrastructure, fail safe is good, convenient and reliable, the advantage of long service life.
Another object of the present invention is the cellular type insulation board designing a kind of high capacity lithium ion battery group, can not pressure release and problem on fire of blasting during to solve that above-mentioned heat radiation is bad, battery is abnormal.
Technical scheme of the present invention is as follows: _
A kind of big current Li-ion batteries piles, comprise a plurality of group of battery modules, a plurality of battery cores of each group of battery modules are connected in parallel by brace, splicing ear is passed through between group of battery modules, connecting line is connected in series, battery pack battery core both positive and negative polarity both sides are provided with insulation board, it is characterized in that said each group of battery modules is often between row battery core positive pole, be connected respectively by big current brace between negative pole, realize being connected in parallel of every row battery core, said big current brace, comprise copper sheet and nickel sheet, said copper sheet is the in-line copper sheet having row's circular port, the center of circle of circular port faces toward the center line of group of battery modules battery core, pore size and battery core relief valve size suitable, the number of openings is corresponding with battery core quantity, said nickel sheet is slightly in I-shaped, two is triangle or semicircle, centre is in-line, the length of nickel sheet is slightly less than the distance of center circle of copper sheet circular port, a space is had between adjacent two nickel sheet, the center line in space overlaps with the center line of battery core, the middle part of nickel sheet is welded between two adjacent circular holes of copper sheet, the weld on the battery core negative or positive electrode surface of welding edges in circular port of nickel sheet,
Further, the space between said adjacent two nickel sheet is 0.9 ~ 1.1mm;
Further, between said group of battery modules each row battery core positive pole, the end of big current brace that connects between negative pole is connected to each other respectively by a copper bar 15, realizes being connected in parallel of each row battery core of group of battery modules;
Nickel sheet 6 profile of the present invention is slightly in I-shaped, I-shaped upper and lower both sides are triangular in shape, the triangle area in-line area middle than I-shaped is many greatly, broaden the sectional area of electric current like this, it also reduce the resistance value of the circuit that electric current flows through, reduce circuit loss, heat energy has directly been converted electric energy to during current flowing resistance, the loss reducing circuit electric energy it also reduces the caloric value of circuit, the caloric value reducing battery pack it also reduces the temperature of battery pack, adds the useful life of battery pack; Nickel sheet and copper sheet weld together, the copper sheet resistivity of overcurrent is less, during battery charging and discharging, circuit caloric value is minimum, improve the overcurrent capability of battery, the problem of circuit heating when solving battery high current charge-discharge, thus improve the reliability of battery, add the useful life of battery, reduce the use cost of battery, be also conducive to environmental protection simultaneously; Circular port on battery relief valve and copper sheet serves the effect of internal pressure relief when battery occurs abnormal jointly, enhances the security performance of battery, is also the weld that battery welds with metal nickel sheet simultaneously; Nickel sheet and the welding position of copper sheet are the in-line part of the nickel sheet middle part overlapping with copper sheet, achieve the effect of simple and reliable process welding.Adopt the group of battery modules that above-mentioned nickel sheet-copper sheet series and parallel connects, the Li-ion batteries piles of composition, have lightweight, available capacity is large, conveyance capacity is strong, the advantage such as safe and reliable.
On the basis of such scheme, said splicing ear is L shape, comprises orthogonal terminal board and side plate, and there is multiple line ball hole arranged in parallel on terminal board top, and side plate has fixing hole, and fixing hole is vertical with the direction of line ball centerline hole; Said connecting line is rope-lay strand, and its core is divided into many, and quantity is corresponding with the quantity in line ball hole, carries out compact siro spinning technology between splicing ear and connecting line;
Further, each line ball hole said is made up of a pair fixed part, and be core crimping hole in the middle of often pair of fixed part, the shape in said line ball hole is circular or square, and said splicing ear is copper tip;
Further, the quantity in said line ball hole 33 is two or three, said line ball hole be connected core and adopt and weld-crimp-mode compact siro spinning technology that welds;
The beneficial effect of such scheme is:
1, connected mode have employed welding-crimping-welding and combines, and adds the bonding strength of splicing ear and wire rod, and reduce contact resistance value and caloric value, entirety improves switching performance, and maintenance cost is low, long service life;
2, the connected mode of same terminal is multi-thread multiple pressure string holes, adds the contact area of splicing ear and wire rod, effectively controls caloric value during super-high-current, reduces and connect temperature, thus promote the reliability connected further;
3, line ball hole and fixing hole vertical design on splicing ear, can avoid the flexural deformation of wire rod, reduce the wastage, and improves wire rod useful life;
Visible, the present invention when connecting for electrokinetic cell circuit, particularly at lithium ion battery big current by situation, reasonable in design, enhance the bonding strength between line and terminal, toughness and contact area, reduce contact resistance value and caloric value, thus improve overall overcurrent capability, have and can permanently effectively use, maintenance cost is low, security performance and mechanical performance high, convenient and reliable, the advantages such as long service life.
On the basis of such scheme, said insulation board is the bakelite plate having a plurality of circular hole, each circle hole centreline overlaps with the center line of relative battery core, circular hole size and battery core pressure relief valve diameter suitable, the quantity of circular hole is identical with the quantity of group of battery modules battery core, insulation board is provided with heat conduction explosion-proof isolation sheet towards the one side of battery core positive and negative electrode, heat conduction explosion-proof isolation sheet has micro-shape and to breathe freely body opening;
Further, the explosion-proof embolium of said heat conduction is three layers of one insulating trip that PP-PE-PP makes, its surface-coated heat-conducting silicone grease and gel, and said pore size is 0.03 ~ 0.2um, perforated area accounts for 40% of the gross area, and the fusing point of the explosion-proof embolium of heat conduction is 130 ~ 150 degrees Celsius;
Further, said heat conduction explosion-proof isolation sheet and insulation board are pressed into and are integrated;
Further, said heat conduction explosion-proof isolation sheet and insulation board are pressed into and are integrated;
Simultaneously the beneficial effect of such scheme solves the insulation of battery, heat radiation and pressure release problem, when battery pack normally works, insulating heat-conductive plate plays insulation and conductive force, the insulating heat-conductive sector-meeting generation hot melt when abnormal high temperature appears in battery, expose pressure release circular hole, carry out pressure release to battery to occur to prevent battery explosion, effectively reduce the probability that blast on fire appears in battery.The invention solves the bad problem of heat radiation of prior art medium power Li-ion batteries piles, battery operated abnormal time can pressure release thus avoid battery explosion on fire, and structure is simple, and cost is low, easily implements.
Accompanying drawing explanation
The present invention has following accompanying drawing:
Fig. 1 big current Li-ion batteries piles structural representation
Fig. 2 copper sheet front schematic view
Fig. 3 copper sheet side schematic view
Fig. 4 nickel sheet schematic diagram
Schematic diagram after Fig. 5 copper sheet welds with nickel sheet
Fig. 6 copper sheet, nickel sheet weld with group of battery modules battery core after schematic diagram
Fig. 7 7.a, 7.b, 7.c splicing ear 3 schematic diagram
Fig. 8 connecting line 4 schematic diagram
Fig. 9 splicing ear 3 is connected design sketch with connecting line 4
The connection procedure schematic diagram of Figure 10 10.a, 10.b, 10.c, 10.d welding-crimping-welding
Figure 11 is insulation board schematic diagram.
Figure 12 is heat conduction explosion-proof isolation sheet schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 1 is big current Li-ion batteries piles structural representation, and as one embodiment of the present of invention, the capacity of lithium battery group can be 120V/300Ah, and discharging current can continue for 100A, maximum discharge current 300A60 second, battery core diameter 18.5mm.
Li-ion batteries piles of the present invention, comprise multiple group of battery modules 12 that series, parallel connects, said group of battery modules by multirow side by side battery core form, often be connected respectively by above-mentioned big current brace 16 between row battery core positive pole, between negative pole, namely often arrange between the positive pole of battery core and negative pole and link together respectively by a nickel sheet-copper sheet of the present invention, realize being connected in parallel of every row battery core; Between each group of battery modules each row battery core positive pole, the nickel sheet of the present invention-end of copper sheet big current brace that connects between negative pole also needs to interconnect respectively, because group of battery modules each row battery core electric current is altogether larger, so the present invention's copper bar of adopting resistance less or copper coin thick copper lines 15 by between each for group of battery modules row battery core positive pole, the end of big current brace that connects between negative pole is connected to each other respectively, realizes being connected in parallel of each row battery core of group of battery modules.
Fig. 2, Fig. 3 are copper sheet front of the present invention, side schematic view.Copper sheet 5 is in yi word pattern, and the diameter of copper sheet width and battery core 7 is suitable, copper sheet 5 has row's circular port 13, and its end can have a wiring hole 14.The center of circle of circular port 13 facing to the center line of battery core 7, pore size and battery relief valve size suitable, slightly larger than the diameter of battery relief valve.As a kind of embodiment, the diameter for relief valve is the battery core of 10mm, and the aperture of circular port 13 can elect 11mm as; The quantity that the number of openings and group of battery modules often arrange battery core is corresponding.
Fig. 4 is nickel sheet schematic diagram.Nickel sheet 6 is substantially in I shape, and two, two triangle or semicircle, the leg-of-mutton size being dimensioned slightly smaller than circular port 13 on copper sheet 5, nickel sheet end profile line also can for approximate elliptic curve, and centre is in-line.Two triangle nickel sheet are positioned at hole 13, are welded on the battery core positive electrode surface in hole or negative terminal surface weld.Nickel sheet and the welding position of copper sheet are the in-line part of the nickel sheet middle part overlapping with copper sheet.Have a space between adjacent two nickel sheet, the center line in space overlaps with the center line of battery.As a kind of example, the width of yi word pattern part is 4mm, and the length of nickel sheet is slightly less than the distance of center circle of copper sheet circular port, and such as, length optional is the distance-1mm between copper sheet two circular holes 13, and in this example, nickel sheet length is 20.2mm.
Fig. 5 is the schematic diagram after copper sheet welds with nickel sheet.Between circular hole nickel sheet 6 being welded on one by one copper sheet 5, concrete grammar is: first by copper sheet 5 surface laser pulse deoxidation film clean, again the middle part of metal nickel sheet 6 in-line part is welded with copper sheet 5, the modes such as the optional electric resistance welding of welding manner or laser welding.Two connect between nickel sheet can the about 1mm in interval, such as can interval 0.9-1.1mm, and fastness is welded in favourable like this increases.Nickel sheet thickness of the present invention is only 0.15mm, and the thickness of copper sheet is 1.0mm, has both been conducive to the welding of battery core, and has had again good overcurrent capability.
Fig. 6 is the schematic diagram after copper sheet-nickel sheet is welded with group of battery modules battery core.First battery core 7 is assembled in Li-ion batteries piles module, after copper sheet 5 welds I-shaped nickel sheet 6, the one side of welding nickel sheet 6 is loaded frock clamp makes copper sheet 5 circular port 13 center line align with battery core 7 center line, again by the triangle that exposes in copper sheet circular port 13 or semicircle nickel sheet, weld together with the negative or positive electrode metal welding junction of nickel sheet lower surface battery core, resistance welded or Laser Welding can be carried out according to battery core characteristic.
Nickel sheet 6 profile that the present invention provides is slightly in I-shaped, I-shaped upper and lower both sides are triangular in shape, the triangle area in-line area middle than I-shaped is many greatly, broaden the sectional area of electric current like this, it also reduce the resistance value of the circuit that electric current flows through, reduce circuit loss, heat energy has directly been converted electric energy to during current flowing resistance, the loss reducing circuit electric energy it also reduces the caloric value of circuit, the caloric value reducing battery pack it also reduces the temperature of battery pack, adds the useful life of battery pack.The tip spacing of two adjacent nickel sheet is 0.9-1.1mm, and the edge of the I-shaped part of nickel sheet aligns with battery core relief valve, and when battery occurs abnormal, inner pressure of battery is by the circular port 13 outwards pressure release of battery relief valve and copper sheet.
Copper sheet length of the present invention, width and thickness are with battery core size and need overcurrent size and adjust, and can require selected according to the parameter designing of lithium battery group.The present invention can be widely used in the UPS of demand big current, the battery supply fields such as EPS.
As shown in Figure 7, lithium ion battery big current splicing ear of the present invention, comprising:
Splicing ear 3 is " L " shape, and comprise orthogonal terminal board 31 and side plate 32, there is multiple line ball hole 33 arranged in parallel on its terminal board 31 top, and side plate 32 has one or more fixing hole 34, and wherein line ball hole 33 is vertical with fixing hole 34 centerline direction.Fig. 7 a is splicing ear front elevational schematic, and Fig. 7 b is splicing ear schematic side view, and Fig. 7 c is splicing ear schematic perspective view.
Described splicing ear 3 is copper tip.
Described line ball hole 33 is two or more, in this example, a splicing ear 3 has three line ball holes.
All there is a pair fixed part 35 in each line ball hole 33 described, is core crimping hole 36 in the middle of often pair of fixed part 35.
Described line ball hole 33 is circular or square.
As shown in Figure 8, lithium ion battery connecting line of the present invention, comprising:
Connecting line 4 is rope-lay strand, and namely same wire inside is twisted into by two strands and above core.Object is, when multi cord and a strand are when total wire diameter is the same, the caloric value of line is the same, but the mode of multi cord decreases the contact resistance of connecting line and splicing ear, thus decrease heat, add area of dissipation, therefore multi cord temperature can be lower simultaneously.
The core of described connecting line 4 be divided into two strands and more than, in the present embodiment, a core connecting wire is divided into three strands.
The core of described line ball hole 33 and connecting line 4, one_to_one corresponding.
Show the splicing ear of three line ball hole compenzines than line ball hole one strand by experiment, effectively reduce contact resistance and the caloric value of line and terminal, increase area of dissipation simultaneously, cause temperature to reduce, in 300C environment, three line ball hole compenzines are lower 12 degree than the splicing ear temperature of line ball hole one strand equally.
As shown in Figure 9, connecting line 4 two ends are connected with two splicing ears 3 respectively, then are alignd with the circular hole of the positive negative output in two group of battery modules respectively by the fixing hole 34 on two splicing ears 3, and screwed lock is firmly fixed.Thus realize the serial or parallel connection of two group of battery modules.
As shown in Figure 10, splicing ear 3 adopts with connecting line 4 and welds-crimp-connected mode of welding, and concrete connection procedure is as follows:
Step a: welding.The inner surface in the line ball hole 33 on splicing ear 3 is added thin tin, to play the clean effect of decontamination.
Step b: wiring.The multiply core of connecting line 4 is respectively charged in the multiple line ball holes 33 on splicing ear 3, one_to_one corresponding.The present embodiment is corresponding three cores in 3 line ball holes.
Step c: crimping.Core good for correspondence is fixed with line ball hole 33 respectively.
Steps d: welding.Space between the core of connecting line 4 and line ball hole 33 completes whole connection procedure after filling with tin welding.
In technique scheme, specification and the battery capacity of splicing ear and connecting line have nothing to do, only the maximum overcurrent parameter correlation that need support actual in battery.Battery as a 1500KWh may only have the application demand of maximum overcurrent 50A, and the battery of another 20KWh may need 200A big current demand.
Fig. 1 is the decomposing schematic representation of insulation board 1, insulating trip 2 and battery module.The high capacity lithium ion battery group 12 that the present invention provides can adopt the structure in prior art 200810026332.1, form battery module by cylindrical or cuboidal secondary lithium-ion battery core, then be combined into a group of battery modules by multiple battery module is arranged together.Six face shells of each Battery pack module group are packaged as a whole, insulation board entirety is square, be installed on two (insulation board is not the shell of single battery module) of group of battery modules, vertical with the battery core long axis direction of institute's device in battery module, another four faces of group of battery modules are the outer wall of module group.The high capacity lithium ion battery group of a radiating explosion-proof can be made up of 1 ~ N number of module group and 2 ~ 2N cellular type explosion-proof isolation plate, and in existing application, N is maximum can get 150 usually.
Figure 11 is insulation board schematic diagram.Insulation board entirety is square, is arranged on group of battery modules battery core positive and negative end.The material selection bakelite plate of insulation board of the present invention, because its fire-protection rating reaches more than UL94V-0, good insulation preformance, hardness is strong, is plastic plate and other material known is incomparable at present.Insulation board thickness and monomer secondary lithium ion battery volume are corresponding relation, and capacity more heavy thickness is larger, can experimentally data determine, such as, in this example, thickness is 5.5mm, and corresponding monomer secondary lithium ion battery volume is 2.6Ah.Circular hole 11 is had in the position that insulation board is corresponding with battery core positive and negative electrode, the quantity of circular hole is identical with the quantity of battery core, the size of circular hole is corresponding with battery core pressure relief valve diameter, diameter can let out 4+ pressure valve diameter slightly larger than battery core, battery core pressure release aperture in this example is 11mm, and the aperture of circular hole can elect 11-11.5mm as; Circle hole centreline overlaps with battery core center line.
Insulation board is provided with heat conduction explosion-proof isolation sheet in the one side of contact group of battery modules, and Figure 12 is heat conduction explosion-proof isolation sheet schematic diagram.Heat conduction explosion-proof isolation sheet material PP-PE-PP can be selected to make three layers one heat conduction explosion-proof isolation sheets 2, in order to strengthen heat conductivility, surface can the Heat Conduction Material such as coated with thermally conductive silicone grease and gel; Said heat-conducting silicone grease and gel can adopt commercially available product.Heat-conducting silicone grease is composited by thermal conductivity and the good metal oxide of insulating properties and organosiloxane, has splendid thermal conductivity, good electrical insulating property, wider serviceability temperature (working temperature-60 DEG C ~ 300 DEG C) and good stability in use.Thermally conductive gel is a kind of new and effective Heat Conduction Material, and thermal resistance is low, good insulation preformance, good stability, strong adhesion, and interface geometrical condition requires low.
In order to be conducive to heat radiation, heat conduction explosion-proof isolation sheet 2 can be opened micro-shape and to breathe freely body opening, such as, bore size can be 0.03-0.2um, and perforated area can account for 40% of the gross area.The thickness of heat conduction explosion-proof isolation sheet can draw through mechanical shock many experiments, and too thick explosion-proof capabilities is poor, too thin external impact easy damaged.As a kind of embodiment, heat conduction explosion-proof isolation sheet thickness is chosen as 55-65um, and its fusing point is designed to 130 ~ 150 degrees Celsius.
Heat conduction explosion-proof isolation sheet and insulation board can be integrated through being pressed into, composition cellular type explosion-proof isolation plate, first the place of insulation board except circular hole can be coated with last layer glue, as long as can paste jail, do not overflow glue, and thickness ensures, then heat conduction explosion-proof isolation sheet horizontal drawing is attached on insulation board, use two plane Pressurized-heated pressings again, be integrated finally by cooling, be cellular type explosion-proof isolation plate of the present invention.
A group of battery modules assembles the both sides that two panels cellular type explosion-proof isolation plate of the present invention is respectively installed to group of battery modules by rear, installation can adopt the mounting means of prior art, such as, first cellular type explosion-proof isolation plate is sticked at battery two, then group of battery modules and cellular type explosion-proof isolation plate are snapped in fixed support simultaneously.Respectively there is a cellular type explosion-proof isolation plate group of battery modules both sides.Heat conduction explosion-proof isolation sheet 2 can be good at external heat conduction when battery is normal, simultaneously by battery core and external isolation, plays the effect of insulating heat-conductive; When battery temperature is higher than during certain value (such as 130 ~ 150 degree, this temperature can be drawn by experiment), battery core is damaged higher than when 100 degree in temperature, if there is blast on fire in battery, instantaneous temperature can up to more than 400 degree, and heat conduction explosion-proof isolation sheet 2 only has more hot melt morning just can better play explosion-proof.When internal temperature of battery exceedes the fusing point of design, the explosion-proof embolium 2 of the exhausted heat conduction of heat conduction will contract by hot melt, expose the circular apertures of insulated electro plank 1, if battery is just in case when occurring abnormal, internal pressure discharges smoothly by the circular port on insulated electro plank, thus prevents the generation of explosion accident.
The adjustment that cellular type explosion-proof isolation plate length and width size in the present invention designs according to the greatly little demand of battery module packet size.Circular port size is also selected according to the actual pressure relief valve size of battery core.
Claims (10)
1. a big current Li-ion batteries piles, comprise a plurality of group of battery modules (12), a plurality of battery cores (7) of each group of battery modules (12) are connected in parallel by brace, by splicing ear (3) between group of battery modules (12), connecting line (4) is connected in series, battery pack battery core both positive and negative polarity both sides are provided with insulation board (1), it is characterized in that said each group of battery modules is often between row battery core positive pole, be connected respectively by big current brace (16) between negative pole, realize being connected in parallel of every row battery core, said big current brace, comprise copper sheet and nickel sheet, said copper sheet is for there being the in-line copper sheet (5) of row's circular port (13), the center of circle of circular port faces toward the center line of group of battery modules (12) battery core (7), pore size and battery core relief valve size suitable, the number of openings is corresponding with battery core quantity, said nickel sheet (6) is slightly in I-shaped, two is triangle or semicircle, centre is in-line, the length of nickel sheet is slightly less than the distance of center circle of copper sheet circular port, a space is had between adjacent two nickel sheet, the center line in space overlaps with the center line of battery core, the middle part of nickel sheet is welded between two adjacent circular holes of copper sheet, the weld on the battery core negative or positive electrode surface of welding edges in circular port (13) of nickel sheet.
2. big current Li-ion batteries piles as claimed in claim 1, is characterized in that the space between said adjacent two nickel sheet is 0.9 ~ 1.1mm.
3. big current Li-ion batteries piles as claimed in claim 1 or 2, the end of the big current brace it is characterized in that between said group of battery modules each row battery core positive pole, connecting between negative pole is connected to each other respectively by a copper bar (15), realizes being connected in parallel of each row battery core of group of battery modules.
4. big current Li-ion batteries piles as claimed in claim 1, it is characterized in that said splicing ear (3) is for L shape, comprise orthogonal terminal board (31) and side plate (32), there is multiple line ball hole (33) arranged in parallel on terminal board (31) top, side plate (32) has fixing hole (34), fixing hole (34) is vertical with the direction of line ball hole (33) center line; Said connecting line (4) is rope-lay strand, and its core is divided into many, and quantity is corresponding with the quantity of line ball hole (33), carries out compact siro spinning technology between splicing ear (3) and connecting line (4).
5. lithium ion battery big current splicing ear as claimed in claim 4, it is characterized in that each line ball hole (33) said is made up of a pair fixed part (35), it is core crimping hole (36) in the middle of often pair of fixed part (35), the shape of said line ball hole (33) is circular or square, and said splicing ear (3) is copper tip.
6. the lithium ion battery big current splicing ear as described in claim 4 or 5, the quantity that it is characterized in that said line ball hole (33) is two or three, said line ball hole be connected core and adopt and weld-crimp-mode compact siro spinning technology that welds.
7. the big current Li-ion batteries piles as described in claim 1 or 4, it is characterized in that said insulation board is for having the bakelite plate of a plurality of circular hole (11), each circle hole centreline overlaps with the center line of relative battery core, circular hole size and battery core pressure relief valve diameter suitable, the quantity of circular hole is identical with the quantity of group of battery modules battery core, insulation board is provided with heat conduction explosion-proof isolation sheet (2) towards the one side of battery core positive and negative electrode, heat conduction explosion-proof isolation sheet has micro-shape and to breathe freely body opening.
8. high capacity lithium ion battery group as claimed in claim 7, it is characterized in that the explosion-proof embolium of said heat conduction is three layers of one insulating trip that PP-PE-PP makes, its surface-coated heat-conducting silicone grease and gel, said pore size is 0.03 ~ 0.2um, perforated area accounts for 40% of the gross area, and the fusing point of the explosion-proof embolium of heat conduction is 130 ~ 150 degrees Celsius.
9. high capacity lithium ion battery group as claimed in claim 7, is characterized in that said heat conduction explosion-proof isolation sheet and insulation board are pressed into and is integrated.
10. high capacity lithium ion battery group as claimed in claim 8, is characterized in that said heat conduction explosion-proof isolation sheet and insulation board are pressed into and is integrated.
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| CN201510036431.8A CN104600236B (en) | 2015-01-23 | 2015-01-23 | A kind of Li-ion batteries piles |
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| CN114552051A (en) * | 2021-07-21 | 2022-05-27 | 万向一二三股份公司 | Battery module and heat-conducting plate for enhancing heat dissipation of battery module |
| CN115196636A (en) * | 2022-09-15 | 2022-10-18 | 溧阳天目先导电池材料科技有限公司 | Metal-doped silicon-based negative electrode material and preparation method and application thereof |
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| CN114552051A (en) * | 2021-07-21 | 2022-05-27 | 万向一二三股份公司 | Battery module and heat-conducting plate for enhancing heat dissipation of battery module |
| US11955664B2 (en) | 2021-11-09 | 2024-04-09 | Amita Technologies Inc. | Battery module |
| CN115196636A (en) * | 2022-09-15 | 2022-10-18 | 溧阳天目先导电池材料科技有限公司 | Metal-doped silicon-based negative electrode material and preparation method and application thereof |
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