CN203205508U - Battery capable of regulating and controlling working temperature by itself - Google Patents
Battery capable of regulating and controlling working temperature by itself Download PDFInfo
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- CN203205508U CN203205508U CN201320221851XU CN201320221851U CN203205508U CN 203205508 U CN203205508 U CN 203205508U CN 201320221851X U CN201320221851X U CN 201320221851XU CN 201320221851 U CN201320221851 U CN 201320221851U CN 203205508 U CN203205508 U CN 203205508U
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Abstract
The utility model discloses a battery capable of regulating and controlling the working temperature by itself. The battery comprises a dry cell, an aluminum plastic film layer arranged on the periphery of the dry cell, and a phase-change material microcapsule layer coating the aluminum plastic film layer. According to the battery, the working temperature of the battery is regulated and controlled by itself through the fact that the phase-change material microcapsule layer absorbs and releases heat energy of the cell.
Description
Technical field
The utility model belongs to the battery production technical field, relates in particular to a kind ofly can regulate and control voluntarily battery of working temperature and preparation method thereof.
Background technology
Battery is subject to extensive use in more and more fields, wherein, the advantages such as lithium battery is accumulation power supply of new generation, and lithium ion battery is high because of its specific energy, have extended cycle life, self-discharge rate is low, operating temperature range is wide, cryogenic effect is good are at present first-selected power accumulators of EV.
A series of chemical reaction all can occur in battery in charge and discharge process, thereby produces reaction heat.The main exothermic reaction of lithium-ion-power cell comprises: the reaction of reaction, negative pole and the adhesive of electrolyte decomposition, anodal decomposition, negative pole and electrolyte and the decomposition of solid electrolyte interface film.In addition, because the existence of the internal resistance of cell, when electric current passes through, can the generating portion heat.These exothermic reactions are to cause the unsafe factor of battery.The thermal safety of electrolyte also directly affects the security performance of whole lithium ion battery dynamical system.In the actual motion environment, dynamical system needs lithium ion battery to possess the characteristics such as large capacity and large multiplying power discharging, but produced simultaneously high temperature has increased operating risk.So, reduce the lithium ion battery working temperature, promote battery performance most important.
At present, the main temperature control method that adopts has: the types of cooling such as Forced Air Convection cooling, liquid cools, air conditioner refrigerating, phase-change material cooling.Phase-change material cooling because it is with low cost, quality light, without additional energy consumption, good cooling results, be the important research direction of following battery thermal management.Based on " method and apparatus of lithium battery constant-temperature the operation " (application number: 201110049712.9) lithium battery is put into this device and contacted with phase-changing energy storage material afterwards that adopts the phase-change material invention, preheat phase-changing energy storage material, latent heat in the time of can relying on the solid liquid phase of phase-changing energy storage material to change is kept the optimum working temperature of lithium battery, reduce ambient temperature to the impact of lithium battery, prolong the useful life of lithium battery.This kind device can be controlled the working temperature of integral battery door to a certain extent, because in use, this kind device is difficult to keep the temperature homogeneity of each piece battery core, and the impact that therefore battery cycle life is caused is irreversible.Therefore, need a kind of new battery of design, overcome defectives such as being difficult to the holding temperature uniformity in the prior art.
The utility model content
The purpose of this utility model is, proposes a kind of battery that can regulate and control voluntarily working temperature, and is even with the temperature that guarantees battery core.
The utility model proposes a kind of battery that can regulate and control voluntarily working temperature, comprising: do battery core, be arranged on the plastic-aluminum rete of the periphery of doing battery core and be coated in phase-change material micro-capsule layer on the plastic-aluminum rete.
Wherein, dried battery core comprises lamination type electric core or takeup type battery core.Can also be other suitable dried battery cores.Do battery core and be used for realizing storage and release current.
Wherein, dried battery core comprises that square does battery core.It can also be the dried battery core of other suitable shape.
Wherein, the plastic-aluminum rete comprises nylon layer, aluminium lamination and polypropylene layer.The plastic-aluminum rete is arranged on the periphery of doing battery core.The plastic-aluminum rete also claims surrounding layer, is the outsourcing material layer of battery.The plastic-aluminum rete is the present generally lithium cell outsourcing material of employing, plays encapsulation and does battery core, completely cuts off air and the moisture of battery core inside and external environment, does not have the function of auto-control temperature.The plastic-aluminum rete is multi-layer compound structure, and for example, plastic-aluminum rete ecto-entad is followed successively by nylon layer, AL layer (aluminium lamination), PP layer (polypropylene layer).
Wherein, described phase-change material micro-capsule layer comprises the phase-change material micro-capsule colloid.The phase-change material micro-capsule layer is coated on the outside of plastic-aluminum rete.Preferably, the phase-change material micro-capsule layer is coated on the outside of nylon layer of plastic-aluminum rete.Further, described phase-change material micro-capsule layer comprises the phase-change material micro-capsule colloid.The utility model can be regulated and control the battery of working temperature voluntarily, absorb and the heat energy that discharges battery core by described phase-change material micro-capsule layer just, for example, the phase-change material micro-capsule layer is attached on the outsourcing material layer plastic-aluminum rete of battery by certain processing mode, thereby realize regulating and control voluntarily the working temperature of battery, reach temperature automatically controlled purpose.
Wherein, the outer surface of the dispensing area of phase-change material micro-capsule layer and dried battery core matches.
The Microencapsulated Phase Change Materials that adopts in the utility model (MicroPCMs) is to adopt microcapsules technology that solid-liquid phase change material (core) is coated solia particle stable under the normality made from synthesized polymer material or inorganic compound (wall material) with physics or chemical method.This solia particle can absorb in very narrow temperature range or discharge considerable latent heat of phase change, has more significant heat-accumulation temperature-adjustment function.The phase-change material that contains in the microcapsules can be when ambient temperature be higher than the phase transition temperature of phase-change material the heat in the absorbing environmental, the generation solid liquid phase changes, until be liquid by Solid State Transformation all, and when ambient temperature is lower than the phase transition temperature of phase-change material again, emit the heat of absorption, the generation liquid-solid phase changes, the temperature that this heat absorption and release function can make capsule surface keeps relatively constant between necessarily drawing, thereby regulating cell can remain on security performance and the cycle life of battery of having worked Effective Raise under the relative stationary temperature.
Description of drawings
Fig. 1 represents the structural representation of the utility model battery.
Fig. 2 represents that the utility model can regulate and control preparation method's the flow chart of the battery of working temperature voluntarily.
Fig. 3 represents the discharge temp contrast schematic diagram of the utility model battery and common batteries.
Fig. 4 represents the preparation process schematic diagram of the utility model battery.
Fig. 5 represents the aluminum plastic film coating schematic diagram of the utility model battery.
Fig. 6 represents plastic-aluminum rete in the utility model battery and applies the structural representation of phase-change material micro-capsule layer thereon.
Embodiment
In conjunction with following specific embodiments and the drawings, the utility model is described in further detail.Implement process of the present utility model, condition, experimental technique etc., except the following content of mentioning specially, be universal knowledege and the common practise of this area, the utility model is not particularly limited content.
Shown in Fig. 1-6,1 expression phase-change material micro-capsule layer, 2 expression nylon layers, 3 expression AL layers, 4 expression PP layers, the blank aluminum plastic film of the uncoated microencapsulation material of 5 expressions, 6 expression microencapsulation materials are coated in the zone on the aluminum plastic film, and battery core is done in 7 expressions.
The utility model can be regulated and control the battery of working temperature voluntarily, as shown in Figure 1, comprises and does battery core 7, is arranged on the plastic-aluminum rete of the periphery of doing battery core and is coated in phase-change material micro-capsule layer 1 on the plastic-aluminum rete.Doing battery core 7 forms unrestricted, can be lamination type electric core, also can be the takeup type battery core, can also be other suitable types.Preferably, doing battery core 7 is that square is done battery core.The plastic-aluminum rete is arranged on the periphery of doing battery core 7.Described plastic-aluminum rete can comprise nylon layer 2, aluminium lamination (AL layer) 3, PP layer (polypropylene layer) 4.Be coated with phase-change material micro-capsule layer 1 in the outside of plastic-aluminum rete, absorb or discharge the heat energy of doing battery core 7 by phase-change material micro-capsule layer 4, realize the auto-control of battery temperature.Shown in Fig. 1,6, in the utility model battery, be arranged on the outsourcing material layer plastic-aluminum rete of doing battery core 7 outsides and comprise successively from inside to outside: polypropylene layer 4, aluminium lamination 3, nylon layer 2.Apply phase-change material micro-capsule layer 1 at outermost nylon layer 2.In the present embodiment, outsourcing material plastic-aluminum rete has comprised nylon layer 2, and phase-change material micro-capsule layer 1 is coated in the surface of nylon layer 2.
In the utility model, the plastic-aluminum rete is except comprising nylon layer 2, aluminium lamination (AL layer) 3, PP layer (polypropylene layer) 4, and the plastic-aluminum rete can also comprise structure and the material that other are suitable.
When battery is worked under high current density, because various chemical reactions occur in inside battery, the temperature of doing battery core 7 can sharply rise, apply one deck phase-change material micro-capsule layer 1 by the surrounding layer aluminum plastic film in battery core, the phase-change material that wherein contains can be when the battery core temperature be higher than the phase transition temperature of phase-change material the heat in the absorbing environmental, the generation solid liquid phase changes, until all phase-change material is liquid by Solid State Transformation.And when the battery core temperature is lower than the phase transition temperature of phase-change material again, emit the heat of absorption, the generation liquid-solid phase changes, this heat absorption and release function can make the temperature of surface of microcapsule keep relatively constant within necessarily drawing a scope, thereby the temperature of battery can be controlled at narrower being suitable for improves battery effectively in the battery operated temperature range security performance and cycle life.Particularly, the surface of microcapsule temperature keeps relatively constant certain hour to refer to that the inner olefin material of microcapsules is from undergoing phase transition the time of whole fusings; This time is relevant with the microcapsules material with concrete external environment condition heat.Particularly, be suitable for battery operated temperature range normally take ambient temperature as lowest temperature, with phase transition temperature as temperature upper limit.Wherein, phase transition temperature depends on the paraffin of specifically selecting.For example, the phase-change material of selecting can be that phase transition temperature is at 30 ℃-45.℃ the paraffin series phase-change material, for example, NSC 77136 hydrocarbon, n-eicosane hydrocarbon, n-docosane hydrocarbon.For example, selecting phase transition temperature is 36.6 ℃ n-eicosane hydrocarbon.For example, the phase-change material of selecting can also be the mixture of satisfactory two or more paraffin series materials of phase transition temperature, such as mixture of 48# paraffin and octadecane hydrocarbon mixture, 48# paraffin and eicosane hydrocarbon mixture, 48# paraffin and octadecane hydrocarbon, eicosane hydrocarbon etc.
Preparation the utility model can be regulated and control the method for the battery of working temperature voluntarily, and as shown in Figure 2, the preparation method of the utility model battery comprises, step 1: phase-change material is carried out encapsulated processing, form phase-change material micro-capsule; Step 2: with described phase-change material micro-capsule and binding agent and solvent, make the phase-change material micro-capsule colloid; Step 3: the method by spraying or roll-in is coated in described phase-change material micro-capsule colloid on the described plastic-aluminum rete, forms the phase-change material micro-capsule layer; Step 4: will apply described plastic-aluminum rete and the described dried battery core assembling of phase-change material micro-capsule layer and carry out subsequent treatment, and make the described battery that can regulate and control voluntarily working temperature.
The phase-change material micro-capsule that the battery that can regulate and control voluntarily working temperature of the present utility model adopts is that the paraffin series phase-change material is carried out encapsulated processing, and its phase transition temperature is between 30 ℃-40 ℃.The paraffin series phase-change material can be the suitable independent component of phase transition temperature, also can be the mixture by a certain percentage of the different paraffin series phase-change material of two or more fusing points.For example, the n-octadecane phase transition temperature is 28.2 ℃; The n-eicosane phase transition temperature is 36.6 ℃; Be 32 ℃ with n-octadecane and n-eicosane by the phase transition temperature of mixing the mixture that forms at 2: 8.The process of encapsulated processing comprises: (1) emulsion process: behind the olefin material hot melt, with the emulsifying agent of certain mass, join in the water of certain volume and carry out emulsification.Particularly, behind 20 gram n-eicosane hot melts, join with 1.2g emulsifying agent SMA and to carry out emulsification in the 200ml water.(2) carbamide prepolymer solution preparation: certain mass melamine and certain volume formaldehyde are joined in the reactor, regulate pH, react transparent to solution.Particularly, 7g melamine and 14ml aldehyde and 20mL deionized water are joined in the reactor, a small amount of triethanolamine is regulated pH to 8-9, and it is transparent to solution that high-speed stirred is reacted.(3) preparation of capsule emulsion: the carbamide prepolymer solution is added drop-wise in the paraffin wax emulsions, and high-speed stirred reaction 4.5 hours is regulated emulsion pH to 8-9 with the triethanolamine solution with 10%, makes the capsule emulsion; (4) decompress filter washs three times with 25% hot ethanol and deionized water respectively, and vacuumize 48 Xiao Ming make phase-change material micro-capsule.
Phase-change material micro-capsule, binding agent and solvent are mixed by a certain percentage, make the phase-change material micro-capsule colloid.For example, the phase-change material micro-capsule component is controlled at 70%-95%; The component of binding agent is controlled at 5%-30%.In the present embodiment, the phase-change material micro-capsule component is 85%, and the component of binding agent is 15%.Can also be phase-change material micro-capsule component 95%, the binding agent component be 5%.Solvent load is 1.3 times of binding agent, and dry rear solvent will all volatilize.Particularly, the binding agent Kynoar is dispersed among the solvent NMP of 1-1.3 times of quality, high-speed stirred adds phase-change material micro-capsule and stirs to fully dissolving, makes the phase-change material micro-capsule colloid.The phase-change material micro-capsule colloid is coated in nylon layer one side of aluminum plastic film, coating method can be spraying, also can be that roll-in is to apply.The dispensing area of phase-change material micro-capsule layer and the outer surface of battery core match.That is, the length of phase-change material micro-capsule layer dispensing area is consistent with length and the width of the contact-making surface of width and battery core and surrounding layer.Aluminum plastic film is coated with as shown in Figure 5, the blank aluminum plastic film of the uncoated microencapsulation material of 5 expressions, and 6 expression microencapsulation materials are coated in the zone on the aluminum plastic film.Apply before by calculating the coated weight of phase-change material micro-capsule layer.The following expression of the computing formula of coated weight:
In the formula, Q
DisBe the battery liberated heat, unit is J; M
PcmBe the quality of phase-change material paraffin, unit is kg; C
pBe the specific heat capacity of phase-change material paraffin, unit is Jkg
-1K
-1T
m, T
iBe respectively phase transition temperature and the initial temperature of phase-change material paraffin, unit is ℃; H is the latent heat of phase change of phase-change material paraffin, and unit is J/kg.The effective area that applies according to battery core again, the coated weight that the content of phase-change material in colloid can calculate unit are.
Particularly, in the present embodiment, doing the battery core model is 08118342, the long 342mm of battery core, the wide 118mm of battery core, thick 8mm.Battery is emitted heat Q
DisThe employing calorimeter assembly is measured, and measures battery core and emit heat 12.6KJ, C under the 3C electric current
pBe the specific heat capacity of phase-change material paraffin, the 1.77Jg that concrete data are looked into by document
-1K
-1, H is the latent heat of phase change of phase-change material paraffin, the 247.8Jg that concrete data are looked into by document
-1T
m, T
iBe respectively phase transition temperature and the initial temperature of phase-change material paraffin, T in this experiment
mBe 36.6 ℃, T
iIt is 29 ℃.Bringing above-mentioned numerical value into quality that formula calculates required phase-change material paraffin is: 48.23g.The microencapsulation material core wall of this experiment preparation is 75/25 than (and mass ratio of olefin material and wall material); The quality that is required microencapsulation material is 48.23/0.75=64.31g; The ratio of microencapsulation material and binding agent is 85/15 in the phase-change material micro-capsule colloid; Be that the solid masses that applies on the final aluminum plastic film is 64.13/0.85=75.45g.Battery core surface effectively coated area is 342*118*2=80712mm
2=807.12cm
2Unit are coated weight=75.45/807.12=0.093g/cm
2
The utility model battery preparation process further comprises, encapsulation, vacuumize, the fluid injection that the aluminum plastic film after processing and dried battery core 7 are carried out postorder, seal, change into, shaping, partial volume and aging, obtain regulating and control voluntarily the battery of working temperature.Particularly, as shown in Figure 4, the utility model battery preparation process comprises: battery core 7 is done in preparation, and tool comprises positive plate, negative plate, barrier film.Then, in dried battery core periphery housing material layer (plastic-aluminum rete is set, comprise PP layer 4, AL layer 3, nylon layer 2), then, apply phase-change material micro-capsule material layer 1 at the housing material layer, as shown in Figure 5, mode by Fig. 5 on the aluminum plastic film applies the phase-change material micro-capsule colloid, after the oven dry, aluminum plastic film is cut into required size, then encapsulates doing battery core 7 with the aluminum plastic film with microencapsulation material of processing.As shown in Figure 5, at the nylon layer 2 one sides coating phase-change material micro-capsule colloid of aluminum plastic film, the length of coating zone is consistent with length and the width of battery core with width.Then dry, cut, a series of subsequent treatment such as moulding, comprise postorder encapsulation, vacuumize, fluid injection, seal, change into, shaping, partial volume, aging, prepare the battery that can regulate and control voluntarily working temperature, its structure as shown in Figure 1.Preferably, prepare the square soft-package battery.
Relatively the utility model battery and conventional common batteries as shown in Figure 3, have the utility model battery of phase-change material coating, and when the 4C multiplying power discharging, the battery core hot face temperature is 36.7 ℃.And the conventional common batteries that applies without phase-change material, when the 4C multiplying power discharging, the battery core hot face temperature is above 40 ℃.
Protection content of the present utility model is not limited to above embodiment.Under the spirit and scope that do not deviate from inventive concept, variation and advantage that those skilled in the art can expect all are included in the utility model, and take appending claims as protection range.
Claims (6)
1. the battery that can regulate and control voluntarily working temperature is characterized in that, comprising: do battery core (7); Be arranged on the plastic-aluminum rete of described dried battery core (7) periphery; And be coated in phase-change material micro-capsule layer (1) on the described plastic-aluminum rete.
2. the battery that can regulate and control voluntarily working temperature as claimed in claim 1 is characterized in that, described dried battery core comprises lamination type electric core or takeup type battery core.
3. the battery that can regulate and control voluntarily working temperature as claimed in claim 1 is characterized in that, described dried battery core is that square is done battery core.
4. the battery that can regulate and control voluntarily working temperature as claimed in claim 1 is characterized in that, described plastic-aluminum rete comprises nylon layer (2), aluminium lamination (3) and polypropylene layer (3).
5. the battery that can regulate and control voluntarily working temperature as claimed in claim 1 is characterized in that, described phase-change material micro-capsule layer (1) comprises the phase-change material micro-capsule colloid.
6. the battery that can regulate and control voluntarily working temperature as claimed in claim 4 is characterized in that, the outer surface of the dispensing area of described phase-change material micro-capsule layer (1) and described dried battery core (7) matches.
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| CN201320221851XU CN203205508U (en) | 2013-04-26 | 2013-04-26 | Battery capable of regulating and controlling working temperature by itself |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124491A (en) * | 2013-04-26 | 2014-10-29 | 上海卡耐新能源有限公司 | Work temperature automatic regulation battery and preparation method thereof |
| CN108258337A (en) * | 2017-12-26 | 2018-07-06 | 中国科学院广州能源研究所 | A kind of method for preventing lithium ion battery thermal runaway |
| CN108270053A (en) * | 2017-12-26 | 2018-07-10 | 中国科学院广州能源研究所 | A kind of device for preventing power lithium-ion battery packet thermal runaway |
| CN116646647A (en) * | 2023-07-26 | 2023-08-25 | 宁德新能源科技有限公司 | Secondary battery and electronic device |
-
2013
- 2013-04-26 CN CN201320221851XU patent/CN203205508U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104124491A (en) * | 2013-04-26 | 2014-10-29 | 上海卡耐新能源有限公司 | Work temperature automatic regulation battery and preparation method thereof |
| CN108258337A (en) * | 2017-12-26 | 2018-07-06 | 中国科学院广州能源研究所 | A kind of method for preventing lithium ion battery thermal runaway |
| CN108270053A (en) * | 2017-12-26 | 2018-07-10 | 中国科学院广州能源研究所 | A kind of device for preventing power lithium-ion battery packet thermal runaway |
| CN116646647A (en) * | 2023-07-26 | 2023-08-25 | 宁德新能源科技有限公司 | Secondary battery and electronic device |
| CN116646647B (en) * | 2023-07-26 | 2023-10-24 | 宁德新能源科技有限公司 | Secondary battery and electronic device |
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Granted publication date: 20130918 |
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