CN203377353U - Battery pack provided with heat dissipation system - Google Patents
Battery pack provided with heat dissipation system Download PDFInfo
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- CN203377353U CN203377353U CN201320337996.6U CN201320337996U CN203377353U CN 203377353 U CN203377353 U CN 203377353U CN 201320337996 U CN201320337996 U CN 201320337996U CN 203377353 U CN203377353 U CN 203377353U
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Abstract
The utility model relates to a battery pack comprising a phase-change material, and the temperature management of the battery pack can be realized by virtue of the heat dissipation function of the phase-change material. The battery pack comprises a plurality of unit batteries and a bracket, wherein the phase-change material is arranged at the upper part of at least one unit battery; the bracket is used for supporting the plurality of unit batteries; the phase-change material is arranged at the largest heat dissipation area of each unit battery; the largest heat dissipation area is within the range from the middle part of the outer surface of each unit battery to the part extending to the end of a positive pole; the phase-change material is packaged, sheathed or filled onto the outer surface of each unit battery and is evenly arranged; when the unit batteries emit heat when being charged or discharged, the temperature rise of the battery units is slowed down due to the action of the phase-change material, so that the aim of heat dissipation can be achieved.
Description
Technical field
The utility model relates to a kind of power brick with cooling system, especially a kind of power brick that comprises the phase-change heat material.
Background technology
Utilize hand held electric tool and the gardens apparatus of rechargeable battery to be widely used in factory, farm, lawn and family expenses, due to these instruments or a plurality of element cells of instrumentation (battery cells), therefore usually a plurality of element cells are packaged into to battery pack, then battery pack and instrument or apparatus are coupled on the instrument of being installed to or apparatus.Existence due to the rechargeable battery internal resistance, when discharging and recharging by the evolution of heat, and these rechargeable batteries are encapsulated in the shell/support of battery pack/power brick compactly, be difficult to dissipation of heat is gone out, when accumulation of heat to a certain degree the time, to affect efficiency and the useful life of battery pack/power brick, the serious safety problem such as even can set off an explosion.Therefore, for preventing battery pack/power brick, too high too fast temperature rise occurs, prevent that battery from blasting and injuring the operator, the discharge prevention measure can be set usually, stop in time electric discharge.In using the hand-held tool or gardens apparatus of rechargeable battery as energy source, the discharging current of battery is larger, and battery temperature is higher, and temperature rise is faster.Especially when heavy-current discharge; as effectively dissipation of heat fallen not in time; will rise at short notice a high temperature; and triggering excess temperature/discharge prevention mechanism; cause machine frequently to carry out the stoppage protection measure; thereby bring operational interruption and trouble, affect whole work operations.Therefore, it is necessary battery being carried out in time and effectively heat radiation.
At present, to the radiating mode of the routine of power brick, be: adopt the gaseous exchange heat radiation, and adopt fin that heat is derived to power brick and then utilize the convection action of surrounding air that temperature is reduced.But adopt described two kinds of methods, extra convection current air channel, fan and fin etc. need to be set in power brick, will increase the volume of power brick, structure is also comparatively complicated.
Phase-change material (PCM) is that the character that need to absorb or emit amount of heat while utilizing material to undergo phase transition is carried out heat accumulation, have that storage density is high, volume is little, heat efficiency advantages of higher, material, its corrosivity is little, nontoxic, stability is high, in the thermostatic control field, as solar energy utilization, heat recovery, building is warming and the existing application widely in the aspect such as air conditioner energy saving, is important heat accumulation mode at present.
Summary of the invention
The purpose of this utility model is to propose a kind of power brick with cooling system, comprise the phase-change heat material, especially a kind of for electric hand-held power tools such as electric drill, electric wrench, electric screwdriver, electric hammer drill, electric circular saw, sander, electric routers, and the power brick of the garden instrument such as electric mower, electric grass mowing equipment, electric clippers, electric trimmer, electric saw.
The utility model proposes a kind of power brick, comprising:
A plurality of element cells, wherein partly be provided with phase-change material at least one element cell;
Support, support described a plurality of element cell;
It is characterized in that, described phase-change material is arranged on the maximum heat dissipation region of element cell, and described maximum heat dissipation region is the outer surface centre position of described element cell and divides the zone of extension to the anode end.
Preferably, described phase-change material is constructed to annular, and is sleeved on the outer surface of described at least one element cell.
Preferably, described phase-change material is encapsulated on described at least one element cell by an encapsulated layer.
Preferably, the described weight that is arranged on the phase-change material at least one element cell is 1.5g～3.5g.
Preferably, the described density that is arranged on the phase-change material at least one element cell is 1kg/l～2kg/l.
What preferably, described maximum heat dissipation region was positioned at described element cell is extended to the position of this element cell longitudinally 2/3rds to positive terminal by the outer surface centre position.
What preferably, described maximum heat dissipation region was positioned at described element cell is extended to the position of this element cell longitudinally 3/4ths to positive terminal by the outer surface centre position.
Preferably, described phase-change material also is arranged on and take the element cell centre position as symmetry axis, towards the negative pole end direction on that extend and symmetrical zone described maximum heat dissipation region.
Preferably, described phase-change material contains fiber material, and the content of fiber material is 0.5%-5%.
Preferably, described phase-change material is filled in the space or the space between described a plurality of element cell and described support between at least described a plurality of element cells.
Preferably, described power brick also comprises at least two backing plates, and described phase-change material is filled between these at least two backing plates.
Preferably, described backing plate supports a plurality of element cells, and the sealing phase-change material.
Preferably, there is additional encapsulant on described at least two backing plates.
Preferably, described support seals described phase-change material.
The utility model power brick, by phase-change material being arranged on to the zone that the element cell caloric value is large, temperature rise is the fastest, improve significantly the radiating effect of phase-change material to battery, especially be applied in battery powered on hand-held tool and garden instrument, can make the temperature rise of battery slow down, extend service time and the life-span of battery.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of the utility model the first embodiment power brick.
Fig. 2 is the schematic diagram after power brick shown in Fig. 1 assembles.
Fig. 3 is the maximum heat dissipation region schematic diagram after the utility model element cell suit phase-change material.
Fig. 4 a is the first structural representation of the interior battery pack of power brick of the utility model the second embodiment.
Fig. 4 b is the second structural representation of the interior battery pack of power brick of the utility model the second embodiment.
Fig. 5 is the schematic diagram at another visual angle of power brick shown in Fig. 4.
Fig. 6 is the schematic diagram before the power brick assembling shown in Fig. 4.
Fig. 7 is the packed good schematic diagram of the utility model the 3rd embodiment phase-change material.
Fig. 8 is the schematic diagram after the element cell of the 3rd embodiment is set with phase-change material.
Fig. 9 a is schematic diagram before the 4th embodiment power brick encapsulation.
Fig. 9 b is schematic diagram after the 4th embodiment power brick encapsulation.
Figure 10 is the 4th embodiment phase-change material schematic diagram.
Figure 11 is the element cell charge-discharge test that adopts the element cell of the utility model phase-change material encapsulation and do not adopt phase-change material to encapsulate table as a result.
Embodiment
In general, the utility model purport, in proposing a kind of power brick that comprises phase-change material, by the thermolysis of phase-change material, realizes the power brick temperature treatment.Accompanying drawing illustrates the power brick according to embodiment more of the present utility model, these power brick are applicable to electric hand-held power tools such as electric drill, electric wrench, electric screwdriver, electric hammer drill, electric circular saw, sander, electric routers, and the garden instrument such as electric mower, grass-mowing machine, electric clippers, pruner, electric saw, for convenience of describing, below these electric hand-held power tools and garden instrument are referred to as to electric tool.Above-mentioned electric tool removably comprises the power brick with given nominal rating voltage, and for example nominal voltage is at least the power brick of 18 volts, 36 volts, and is driven by these power brick.Obviously, power brick of the present utility model is not limited to above-mentioned electric tool, also be not limited to the nominal voltage of above-mentioned appointment, in fact, instruction of the present utility model is applicable to the battery-powered cordless power tool (Cordless Power Tool) of any type, the power brick of any shape, and the voltage of any specified nominal value.
Power brick of the present utility model, in certain embodiments, rechargeable battery is the lithiumation battery, No. 18650 column lithium ion batteries that for example lithium ion battery, especially electric tool occasion are often used.In certain embodiments, power brick can comprise at least one rechargeable unit battery, or comprises a plurality of rechargeable unit batteries, and this depends on the specified nominal value of difference of power brick.The power brick of these different nominal values, can realize by connect a plurality of rechargeable unit batteries and/or a plurality of rechargeable unit battery in parallel.Certainly, the rechargeable unit battery also can be configured to other and take the lithiumation battery that lithium is matrix, or the rechargeable battery of other chemical matrix of NI-G, ni-mh and so on.
Some example row embodiment of power brick of the present utility model as shown in drawings, power brick can be but be not limited to square, tubular, turriform or other shapes etc.In general, power brick comprises shell, at least one element cell; for carrying out the electronic device of inside and outside control and protection measure; with the terminal component that external charger or electric tool are connected, element cell bindiny mechanism, and the phase-change material arranged adjacently with element cell.In certain embodiments, power brick also comprises the supporting construction that supports described at least one element cell.Apparently; the shell of above-mentioned power brick; at least one element cell; for carrying out the electronic device of inside and outside control and protection measure; the terminal component be connected with external charger or electric tool; and the internal configurations such as element cell bindiny mechanism is generic configuration, therefore in this specification and accompanying drawing, will repeat no more.The internal heat dissipation structures that the utility model power brick is described in detail in detail below in conjunction with accompanying drawing reaches the configuration for the phase-change material to the element cell heat radiation.This configuration can solve power brick when discharging and recharging, the heat dissipation problem while especially discharging being used to electric tool that electric energy is provided, and solve the distribution of the interior element cell of power brick while using phase-change material and the compactedness problem of power brick.
Power brick of the present utility model comprises shell and at least one lithium ion element cell 100, the power brick of the first embodiment as shown in Fig. 1 and 2, comprise a plurality of element cells 100, each element cell 100 is arranged each other compactly, form a battery pack 200, also comprise support 101 and support 102, be distributed in the both ends of a plurality of element cells 100 and formed battery pack 200 thereof, in the vertically extending plane of longitudinally of arranging at a plurality of element cells 100, arrange, in order to support a plurality of element cells 100 and formed battery pack 200 thereof, and pass through screw, the mechanical system fixed structures such as buckle, battery pack 200 is formed to a compact structure, it is characterized in that, partly be provided with phase-change material 500 on element cell 100, this phase-change material 500 is configured to adapt to the loop configuration of the outline of each element cell 100, and be sleeved on the maximum heat dissipation region of element cell 100.This maximum heat dissipation region is defined within the regional (see figure 3) that the outer surface centre position A by element cell 100 partly extends to positive terminal.
As shown in Figure 3, the length of element cell 100 is about 65mm, diameter is about 18mm, and the element cell zone that temperature rise is the fastest when discharging and recharging is positioned at the zone of in the middle of the outer surface of element cell, being partial to positive terminal 5mm, that is to say, position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend the position of 5mm to the about 37.5mm of position B(to positive terminal) defined zone, for the temperature of element cell rises, it is the most also the zone of protection temperature of full out reaching capacity, therefore, in certain embodiments, this zone is preferably the maximum heat dissipation region of element cell 100, phase-change material 500 is sleeved on this zone.For reaching more preferably radiating effect, in certain embodiments, phase-change material can also be sleeved on from the position of the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 43.3mm of position C(of whole element cell 100 longitudinally length 2/3rds) defined zone, or from the position of the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 48.75mm of position D(of whole element cell 100 longitudinally length 3/4ths) defined zone, now, these positions are preferably the maximum heat dissipation region of element cell 100.
As shown in Figure 1 and Figure 2, each annular phase-change material 500 is had the shape that is adapted to element cell 100 outlines by the phase-change material particulate, be constructed in the present embodiment annular, its thickness is 0.8-1mm, length is 28-32mm, concrete size can be adjusted according to size and the arrangement mode of element cell 100, by frock or other modes, is sleeved on element cell 100.For reaching more preferably radiating effect, further, annular phase-change material 500 can also be arranged on the centre position A from element cell 100, the zone of extending towards negative pole end, extend to always take A as symmetric points, with the position of B position, C position or D position symmetry.That is to say, phase-change material 500 can also be arranged on take element cell mid point A as symmetric points, on the symmetrical region of negative pole end direction extension.
The maximum heat dissipation region suit phase-change material 500 of element cell 100 forms overlay area 400, for preventing that phase-change material 500 from leaking when the phase transformation, encapsulated layer 600 is installed on overlay area 400, this encapsulated layer 600 can be only to seal overlay area, or seals the outside cylinder profile of whole element cell.Encapsulated layer 600 is a kind of insulating material, as heat-sealing tube, is preferably the identical encapsulated layer of encapsulating materials a kind of and element cell 100 bodies.
As Fig. 4, the second embodiment of the present utility model shown in Fig. 5 and Fig. 6, power brick comprises a plurality of lithium ion element cells 100, wherein element cell 100 can be No. 18650 column lithium ion batteries that the electric tool occasion is often used, each element cell 100 is arranged each other compactly, form a battery pack 200, form space 300 between adjacent cell 100, phase-change material 500 is filled in the segment space in described space 300, and the outer surface of adjacent unit battery 100 be arranged on its maximum heat dissipation region, this maximum heat dissipation region is defined within the zone that the outer surface centre position A by element cell 100 partly extends to positive terminal.As shown in Figure 3, position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend the position of 5mm to the about 37.5mm of position B(to positive terminal) defined zone, this zone quilt can also be the position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 43.3mm of position C(of whole element cell 100 longitudinally length 2/3rds) defined zone, or from the position of the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 48.75mm of position D(of whole element cell 100 longitudinally length 3/4ths) defined zone.
As shown in Figure 6, power brick also comprises support 101 and support 102, be distributed in the both ends of a plurality of element cells 100 and formed battery pack 200 thereof, in the vertically extending plane of longitudinally of arranging at a plurality of element cells 100, arrange, in order to support a plurality of element cells 100 and formed battery pack 200 thereof, and, together with overall package part 110, battery pack 200 is packaged into to the structure that a compactness is arranged.
Power brick also comprises backing plate 103 and backing plate 104, backing plate 103 and backing plate 104 and support 101 and support 102 are similarly, in the vertically extending plane of longitudinally of arranging at a plurality of element cells 100, arrange, the hole 105 that there is respectively the outer contour shape that adapts to element cell 100 on backing plate 103 and backing plate 104, so, backing plate 103 can be arranged on the centre position of battery pack 200, the formed cross section A ' of position A position when namely each element cell is arranged, for reaching desirable radiating effect, when backing plate 103 can also be arranged on each element cell arrangement, A formed cross section A ' in position extends the position of certain distance to the negative pole end of element cell, especially the position of 1-5mm.The installation of backing plate 104 below will be described in detail in detail and to the sealing of phase-change material.
While oppositely arranging each other between each element cell 100 in battery pack 200, the formed cross section B ' of position B position when backing plate 104 is arranged on element cell 100 arrangement, the perhaps formed cross section C ' of position C position, maximum heat dissipation region is defined within as the zone between backing plate 103 and backing plate 104, so, owing to existing the element cell that positive and negative both direction is arranged in battery pack 200, 200 two cross section B ' that will occur on positive terminal and negative pole end both direction in a battery pack, C ' position, therefore and define two maximum heat dissipation region, phase-change material 500 will be filled in the part space 300 that two these zones limit, in this case, backing plate 103 can be set, and two backing plates 104 only are set, phase-change material 500 is filled between two backing plates 104, seal phase-change material 500 by these two backing plates 104.Can associate D formed cross-section location (not shown) in position when backing plate 104 is arranged on element cell 100 arrangement.
While arranging each other between each element cell 100 in battery pack 200 in the same way, insight in advance, the formed cross section B ' of position B position when backing plate 104 is arranged on element cell 100 arrangement, the perhaps formed cross section C ' of position C position, the perhaps formed cross-section location (not shown) of position D, so arrange, maximum heat dissipation region is defined within the zone between backing plate 103 and backing plate 104, phase-change material 500 is after manufacturing process is processed into Powdered or graininess, be filled in the part space 300 that this zone limits, directly be contacted with the maximum heat dissipation region of the outer surface of each element cell, and complete the sealing to phase-change material by backing plate 103 and backing plate 104.Can associate, backing plate 104 also can be directly installed on support 104, in support 104 support unit batteries and battery pack, realizes the sealing to phase-change material.
As Fig. 7, Figure 8 shows that the power brick of the 3rd embodiment of the present utility model, comprise a plurality of battery units 100, each element cell 100 is arranged each other compactly, form a battery pack 200, also comprise support 101 and support 102, be distributed in the both ends of a plurality of element cells 100 and formed battery pack 200 thereof, support a plurality of element cells 100 and formed battery pack 200 thereof, battery pack 200 is packaged into to the structure that a compactness is arranged, it is characterized in that, phase-change material 500 is insulated material and evenly after encapsulation, forms a phase-change material packaging body 700, and pass through adhesive tape, the mode such as double faced adhesive tape or adhesive is fixed on the maximum heat dissipation region of element cell 100, this maximum heat dissipation region is defined within the zone that the outer surface centre position A by element cell 100 partly extends to positive terminal.As shown in Figure 3, be defined within the position be positioned at from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend the position of 5mm to the about 37.5mm of position B(to positive terminal) defined zone, this zone quilt can also be the position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 43.3mm of position C(of whole element cell 100 longitudinally length 2/3rds) defined zone, or from the position of the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 48.75mm of position D(of whole element cell 100 longitudinally length 3/4ths) defined zone.Further, phase-change material packaging body 700 can also be arranged on the mid point A from element cell 100, the zone of extending towards negative pole end, extend to always take A as symmetric points, with the position of B position, C position or D position symmetry.That is to say, phase-change material packaging body 700 can also be arranged on take element cell mid point A on the symmetrical region of symmetric points, the described maximum heat dissipation region of extending towards the negative pole end direction.As shown in Figure 8 for being set with the single-unit element cell of phase transformation packaging body.
As Fig. 7, shown in Fig. 8, by weight, be 2.5g, density approaches the phase-change material 500 insulation-encapsulated body of 1kg/l, as polybag, evenly after encapsulation, form phase-change material packaging body 700, the thickness of phase-change material packaging body 700 is 0.8-1mm, length is 28-32mm, concrete size can be adjusted according to size and the arrangement mode of element cell 100, after its sealing two ends, pass through again adhesive tape, the mode such as double faced adhesive tape or adhesive is wrapped in the maximum heat dissipation region of element cell 100 outer surfaces, and to take element cell mid point A be symmetric points, on the symmetrical region of the described maximum heat dissipation region of extending towards the negative pole end direction.After so arranging, then, by a plurality of element cells 100, as the mode in embodiment mono-, assembling is fixed into battery pack 200 and is arranged in battery pack case.
As shown in Figure 9, Figure 10, be the utility model the 4th embodiment, power brick comprises a plurality of lithium ion element cells 100, each element cell 100 is arranged each other compactly, forms a battery pack.Be formed with space between adjacent cell 100 and between element cell 100 and left and right support 101,102,500 of phase-change materials are filled in the space in described space, and the outer surface of adjacent unit battery 100 be arranged on its maximum heat dissipation region, this maximum heat dissipation region is defined within the zone that the outer surface centre position A by element cell 100 partly extends to positive terminal.As shown in Figure 3, position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend the position of 5mm to the about 37.5mm of position B(to positive terminal) defined zone, this zone quilt can also be the position from the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 43.3mm of position C(of whole element cell 100 longitudinally length 2/3rds) defined zone, or from the position of the about 32.5mm of centre position A(of the longitudinally of element cell 100), extend to positive terminal the position that more distance arrives the about 48.75mm of position D(of whole element cell 100 longitudinally length 3/4ths) defined zone, or described phase-change material 500 also is arranged on, and to take element cell 100 centre position A be symmetry axis, towards the negative pole end direction on that extend and symmetrical zone described maximum heat dissipation region.
As shown in Fig. 9 b, preferably described support 101,102 can be made by Heat Conduction Material, as metallic aluminium, carborundum etc., described support 101,102 is fixed by mechanical systems such as screws, and by the element cell 100 and phase-change material 500 encapsulation that set, support fully contacts with phase-change material, the heat that battery unit can well be produced conducts, reach good radiating effect, realize the sealing to phase-change material 500 simultaneously, when phase-change material undergoes phase transition, can prevent its leakage.
The surface of element cell 100 can also scribble the materials such as heat-conducting glue, heat-conducting resin, increases the contact area of phase-change material 500 and element cell 100, strengthens the heat exchanger effectiveness of phase-change material 500 and element cell 100.Can also add the highly heat-conductive materials such as aluminium nitride, carbon fiber, graphite in phase-change material, improve efficiency and the effect of phase-change heat.
The phase-change material that uses 500 in power brick of the present utility model, be preferably a kind of organic composite phase-change material, its corrosivity is little, nontoxic, the phase transformation form stable, especially the phase-change material that a kind of polyethylene glycol is carrier, and adding silica gel solution as the resulting phase-change material of nanometer supporting construction, its enthalpy of phase change can reach 150 to 350J/g.When undergoing phase transition, can keep its form substantially constant, and under the sealing of encapsulating structure of the present utility model and sealant, trickling can not occur and cause the phase-change material serious leakage.After adding therein the composite flame-retardant agent of a certain proportion of graphite and APP, can also significantly improve the fire resistance of phase-change material, due to the heat exchange action of graphite, especially expansible graphite can improve the phase-change material heat exchanger effectiveness simultaneously.
The phase-change material that uses 500 in power brick of the present utility model, it can also be a kind of inorganic salts phase-change material, as comprise sodium acetate 80%-90%, neopelex 1%-5%, carboxymethyl cellulose 1%-5%, the mixture of sodium carbonate 1%-5%, or polyethylene glycol approaches 50%-99% and cellulose diacetate 1%-10%(also can substitute cellulose diacetate with other thickeners, shitosan for example, all belong to protection range of the present utility model), after mixture is smashed and is mixed thoroughly, obtain needed phase-change material, after machine-shaping or being packaged into packaging body, be arranged on each element cell, also can convert as required component and corresponding proportioning.
The phase-change material 500 that the utility model is used can be also the phase-change material of other types, comprise fat hydrocarbon, polymeric polyalcohols, organic solid-liquid phase change materials such as polyene alcohols, as paraffin, perhaps polyalcohols, the Studies of Solid-solid Phase Change Materials such as high score subclass, as pentaerythrite (PE), trimethylolethane (PG), neopentyl glycol (PG) etc., the perhaps organic composite phase-change material of other types, as paraffin/graphite composite phase-change material, paraffin/polyvinyl alcohol composite phase-change material etc., can also be the hydration salts such as sodium acetate, the inorganic phase-changing materials such as molten salts.
At least one highly heat-conductive material formed in graphite, carbon fiber, foam metal, nano aluminum nitride, nano-sized metal particles, nanosize metal oxide particle, metal fillings can added in phase-change material, increase the thermal conductivity of composite phase-change material, improve the radiating efficiency of phase-change material.
Can also in phase-change material, add fiber material, as natural or man-made fibre materials such as acetate fiber, polyester fiber, glass fibre, metallic fiber, cotton fiber, strings, be preferably glass fibre, wherein the content of fiber material is 0.5%-5%, is preferably 0.5%-1%.Concrete manufacture method, for phase-change material powder and fiber material are mixed by a certain percentage, after stirring, as raw material, is processed into the phase-change material of ideal form by Shooting Technique.After adding fiber material in phase-change material, its intensity can be improved, easier machine-shaping and difficult broken.
In power brick of the present utility model, the weight of the phase-change material arranged on element cell 100 is certain, the phase-change material weight of each battery unit 100 suit or encapsulation is 1.5～3.5g, its density is between 1～2kg/l, and be evenly distributed on the outer surface of battery unit, preferably, when on each battery unit 100, the phase-change material weight of suit or encapsulation is 2～3g, can phase-change material be uniformly distributed by encapsulating structure or sealant, and keep good uniform form when undergoing phase transition, reach best radiating effect., so arrange simultaneously, can also keep element cell after encapsulation and profile and the volume of the battery pack that forms thereof large increase can not occur, still form a kind of compact structure.
Significantly, in power brick of the present utility model, phase-change material 500 does not cover the outer surface of whole element cell 100, but the heating that is distributed in element cell is the fastest, the part that temperature rise is the highest, the maximum heat dissipation region in the utility model namely, so arrange, on the one hand, can keep comprising the element cell of phase-change material, the compact size of battery pack and power brick, simple in structure, be easy to install, on the other hand, total amount and limitations in density due to the phase-change material that is applicable to each element cell, can be when homogenizing distributes, keep good sag resistance, even situation trickling or that leak occurs, because phase-change material of the present utility model does not cover the outline of whole element cell, therefore can not make the phase-change material trickling or leak to two ends and the both positive and negative polarity position of element cell 100, and cause thus battery failures.
When battery unit 100 charge or discharge, when its temperature rises to approximately 40 degrees centigrade, phase-change material 500 starts to play a role, the temperature rise of power brick is slowed down, while finishing to final electric discharge, the temperature of element cell remains on 70 degrees centigrade of temperature of protection once, reach the purpose of heat radiation, and the quick heat radiating while coordinating charging, guarantee power brick to there is certain discharge time and can not carry out continuously the actions such as overheat protector, occasion at heavy-current discharge, particularly use the garden class instrument occasion of 36 volts of specified nominals or 56 volts of power brick power supplies, can guarantee that power brick can continuous operation within certain discharge time, and the useful life of improving battery, also make power brick become possibility to the Infinite Cyclic continuation of the journey of electric tool.
Battery unit is in when electric discharge, and its heat sent is directly proportional to the size of discharging current, and after discharging and recharging certain number of times, its internal resistance increase, by the heat that further increases element cell and send when discharging and recharging.As shown in figure 11, be the single battery unit of the annular phase-change material of suit and the test result of the battery pack that forms thereof in embodiment mono-.Battery unit 100 is after the maximum heat dissipation region suit phase-change material of its maximum heat dissipation region and symmetry, under the condition of 25 degrees centigrade, increase discharging current, after charge and discharge cycles 300 times, its actual maximum residual battery capacity is apparently higher than the actual greatest residual capacity of the element cell that phase-change material is not set.The power brick that the battery pack of take in embodiment mono-is the experimental subjects 14S2P of formation in parallel, now the specified of power brick is nominally 56 volts, under the condition of 35 degrees centigrade, the discharging current cycle charge-discharge to power brick with 10A, significantly, battery pack of the present utility model is charge and discharge cycles 500 times, even after 700 times, still can keep the capacity of 73%, and the battery pack of packaging phase change material has not been damaged after discharging and recharging 188 times, record the actual capacity of battery unit lower than 60%, even lower.
In certain embodiments, support 101 and support 102 can be that working of plastics, aluminium nitride or other have the insulating material of high thermal conductivity, itself are also a kind of good conductors of heat, and the dissipation of heat of element cell 100 is gone out.Support 101 and support 102 can also be with certain elasticity to keep certain strain space, are used for disappearing to from inner or the outside vibrations to element cell 100 and battery pack 200.
Similarly, backing plate 103 and backing plate 104 can be that working of plastics, aluminium nitride or other have the insulating material of high thermal conductivity, itself are also a kind of good conductors of heat, and the dissipation of heat of element cell 100 is gone out.
The shape of element cell 100 can be also flat, rectangle or other regular shapes, according to instruction of the present utility model, phase-change material 500 also can be arranged on the element cell by these non-cylindricals, and be evenly distributed on the maximum heat dissipation region of these element cells, reach desirable radiating effect.
It is restriction of the present utility model that above drawings and Examples only do not mean that for the utility model is described; to those skilled in the art; all do not exceed apparent variation of the present utility model and distortion, within all falling into the scope that claims ask for protection.
Claims (15)
1. a power brick comprises:
A plurality of element cells, wherein partly be provided with phase-change material at least one element cell;
Support, support described a plurality of element cell;
It is characterized in that, described phase-change material is arranged on the maximum heat dissipation region of element cell, and described maximum heat dissipation region is the outer surface centre position of described element cell and divides the zone of extension to the anode end.
2. power brick as claimed in claim 1, is characterized in that, described phase-change material is constructed to annular, and be sleeved on the outer surface of described at least one element cell.
3. power brick as claimed in claim 2, is characterized in that, described phase-change material is encapsulated on described at least one element cell by an encapsulated layer.
4. power brick as claimed in claim 3, is characterized in that, the described weight that is arranged on the phase-change material at least one element cell is 1.5g～3.5g.
5. power brick as claimed in claim 4, is characterized in that, the described density that is arranged on the phase-change material at least one element cell is 1kg/l～2kg/l.
6. power brick as claimed in claim 1, is characterized in that, what described maximum heat dissipation region was positioned at described element cell is extended to the position of this element cell longitudinally 2/3rds to positive terminal by the outer surface centre position.
7. power brick as claimed in claim 1, is characterized in that, what described maximum heat dissipation region was positioned at described element cell is extended to the position of this element cell longitudinally 3/4ths to positive terminal by the outer surface centre position.
8. power brick as described as claim 6 or 7, is characterized in that, described phase-change material also is arranged on take the element cell mid point as symmetric points, towards the negative pole end direction on that extend and symmetrical zone described maximum heat dissipation region.
9. power brick as claimed in claim 1, is characterized in that, described phase-change material contains fiber material, and the content of fiber material is 0.5%-5%.
10. power brick as claimed in claim 1, is characterized in that, described phase-change material at least is filled in the space between described a plurality of element cell or in the space formed between a plurality of element cell and described support.
11. power brick as claimed in claim 10, is characterized in that, described power brick also comprises at least two backing plates, and described phase-change material is filled between these at least two backing plates.
12. power brick as claimed in claim 11, is characterized in that, described backing plate supports a plurality of element cells, and the sealing phase-change material.
13. power brick as claimed in claim 12, is characterized in that, on described at least two backing plates, has additional encapsulant.
14. power brick as claimed in claim 10, is characterized in that, described support sealing phase-change material.
15., as claim 13,14 described power brick, it is characterized in that: described backing plate, support are made by Heat Conduction Material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337996.6U CN203377353U (en) | 2013-06-13 | 2013-06-13 | Battery pack provided with heat dissipation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320337996.6U CN203377353U (en) | 2013-06-13 | 2013-06-13 | Battery pack provided with heat dissipation system |
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| CN203377353U true CN203377353U (en) | 2014-01-01 |
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| CN201320337996.6U Expired - Fee Related CN203377353U (en) | 2013-06-13 | 2013-06-13 | Battery pack provided with heat dissipation system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241730A (en) * | 2013-06-13 | 2014-12-24 | 南京德朔实业有限公司 | Battery pack with heat dissipation system |
| CN106785221A (en) * | 2017-02-10 | 2017-05-31 | 华霆（合肥）动力技术有限公司 | Battery cooling apparatus preparation method, battery cooling apparatus and battery modules |
| CN107325792A (en) * | 2017-06-29 | 2017-11-07 | 中能东道集团有限公司 | It is a kind of for composite phase-change material of electrokinetic cell bag heat management and preparation method thereof |
| CN107507946A (en) * | 2017-08-24 | 2017-12-22 | 乔丰科技实业（深圳）有限公司 | A kind of bee-hole sealing structure and its processing method |
-
2013
- 2013-06-13 CN CN201320337996.6U patent/CN203377353U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104241730A (en) * | 2013-06-13 | 2014-12-24 | 南京德朔实业有限公司 | Battery pack with heat dissipation system |
| CN106785221A (en) * | 2017-02-10 | 2017-05-31 | 华霆（合肥）动力技术有限公司 | Battery cooling apparatus preparation method, battery cooling apparatus and battery modules |
| CN106785221B (en) * | 2017-02-10 | 2019-02-26 | 华霆（合肥）动力技术有限公司 | Battery cooling apparatus preparation method, battery cooling apparatus and battery modules |
| CN107325792A (en) * | 2017-06-29 | 2017-11-07 | 中能东道集团有限公司 | It is a kind of for composite phase-change material of electrokinetic cell bag heat management and preparation method thereof |
| CN107507946A (en) * | 2017-08-24 | 2017-12-22 | 乔丰科技实业（深圳）有限公司 | A kind of bee-hole sealing structure and its processing method |
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