CN109841893A - A kind of thermal coupling low-temperature resistance lithium ion battery - Google Patents
A kind of thermal coupling low-temperature resistance lithium ion battery Download PDFInfo
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- CN109841893A CN109841893A CN201711188869.3A CN201711188869A CN109841893A CN 109841893 A CN109841893 A CN 109841893A CN 201711188869 A CN201711188869 A CN 201711188869A CN 109841893 A CN109841893 A CN 109841893A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
A kind of thermal coupling low-temperature resistance lithium ion battery, mainly by lithium ion battery, carbon-coating electric-heating thin film, temperature controller, temperature and resistance composition, carbon-coating electric-heating thin film is tightly attached to the two sides of lithium ion battery, surface heat when carbon-coating electric-heating thin film is powered, the heat on carbon-coating electric-heating thin film surface is conducted to lithium ion battery, lithium ion battery obtains heat, temperature rises, at the same time, lithium ion battery is in discharge process itself heat production, lithium ion battery itself heat production and carbon-coating electric-heating thin film are thermally formed thermal coupling, further speed up lithium ion battery rate of rise in temperature, when temperature rises to set temperature, temperature controller disconnects carbon-coating electric-heating thin film and lithium ion battery circuit, carbon-coating electric-heating thin film stops working, lithium ion battery enters normal-temperature operating condition.Discharge capacity can be restored to room temperature operating condition, improve the existing lithium ion battery defect that performance deteriorates at low temperature, ensure so that battery especially can also provide power supply in extreme climate at a lower temperature.
Description
Technical field
The present invention relates to field of lithium ion battery, especially a kind of thermal coupling low-temperature resistance lithium ion battery.
Background technique
Lithium ion battery is widely used in various electronic equipments because having many advantages, such as that light weight, specific energy are high and the service life is long.Especially
It is military communication field, radio communication base station power supply and new-energy automobile.Military communication has battery behavior tightened up
Requirement, especially at a lower temperature also can provide power supply ensure, it is necessary to meet the reliability under extreme climate.
Document is recorded, research shows that LiCoO2/ C lithium ion battery room temperature and low-temperature characteristics difference at a temperature of -20 DEG C, rise
Begin electric discharge only 3.8V, and electric discharge reduces 0.35V when than room temperature, and during discharge, cell voltage decrease speed is very fast, entirely puts
Without apparent discharge voltage plateau in electric process, discharge capacity also reduce 30% [Chen Jitao, Zhou Henghui, Ni Jiangfeng, Chang Wenbao,
The kind auspicious C/LiCoO of cloud2Series lithium ion battery low temperature charge-discharge performance [J] battery 2003 (34) 2,89~91].Lead to lithium-ion electric
Capacity decline is mainly by following three aspect factor under the low temperature of pond:
1. the lithium ion transport performance of electrolyte is poor；
2. leading to the decomposition of electrolyte due to the deposition of lithium metal in charging process；
3. diffusional resistance of the lithium ion in graphite cathode is big.
Document is recorded: at low temperature, lithium ion is embedded in the diffusion velocity of Carbon anode to Carbon anode, takes off from carbon-coating than lithium ion
Diffusion velocity when out is slower, and when charging under cryogenic, negative terminal surface be easy to cause the precipitation and deposition of lithium, deposits
With electrolyte irreversible reaction occurs for lithium metal large specific surface area, the reactivity with height, to cause the capacity of battery
[Chen Meng, Fu Qingmao, Yang Chunlin, Wen Zhongchen, Lai Chunyan, Xie Jingying, Shi Pengfei, three-electrode battery are used for lithium for irreversible reduction
Ion battery cryogenic property research [J], China rare earth journal, 2004, (22) album, 173~176]
The increase of positive and negative electrode granule solid transmission ionic resistance, leads to battery large current charge performance under low temperature under low temperature
Deterioration, when large current charge, the rate limit of the solid phase transmission abjection and insertion of lithium ion, the lithium ion in positive electrode particle
Have little time to supplement the lithium ion that extra-granular is deviate from, the inside and outside layer of particle just generates concentration polarization.
Performance deteriorates under lithium ion battery cryogenic conditions, and there is also other physical factors, as temperature reduces, inside battery
Each phase, physical characteristic also change therewith, and liquid phase is solidified to solid phase transformation, the partial solvent of electrolyte, cause Ion transfer tired
Difficulty, conductive capability decline improve the solidification of solvent low temperature by the way that subzero small molecule solvent is added, can significantly improve low temperature and lead
Electric energy power, but corroding electrode collector will lead to using small molecule solvent, and negative terminal surface is brought to be melted into bad problem.
From flexibility to rigid transition, colloidal compound in pole coating, rigidity constantly reduces with temperature and increases diaphragm,
The originally interlayer space of yield situation increases because yield situation becomes rigid stress, and caused ion migration resistance increases, from
And increasing internal resistance, available capacity is reduced.
Influence lithium ion battery cryogenic property deterioration, further include SEI film resistance, interface charge transmitting resistance increase, lithium from
Son is reduced by SEI membrane diffusion coefficient.
The electrolyte worsened wettability of diaphragm at low temperature, caused ion migration resistance increase, under low temperature condition these
Factors affect lithium ion battery cryogenic property.
Summary of the invention
The present invention is directed to existing lithium ion battery, the increase of positive and negative electrode granule solid lithium ion transport impedance under low temperature.Liquid
Opposite solid phase transformation, the partial solvent solidification of electrolyte, causes lithium ion mobility difficult.Diaphragm is from flexibility to rigid transition, pole
Colloidal compound in piece coating, rigidity are reduced with temperature and are continuously increased, and also result in Ion transfer difficulty, exist under low temperature
It is multifactor that capacity is caused to decline；It is proposed a kind of thermal coupling low-temperature resistance lithium ion battery.Thermal coupling low-temperature resistance lithium ion battery includes
Lithium ion battery, carbon-coating electric-heating thin film.Carbon-coating electric-heating thin film is close to installation, the confession of carbon-coating electric-heating thin film with lithium ion battery cell
Electricity is to control lithium ion battery by the temperature controller outside lithium ion battery involucrum by temperature controller and carbon-coating electric heating is thin
Film is turned on or off, and when lithium ion battery is connected with carbon-coating electric-heating thin film, carbon-coating electric-heating thin film heat production is to lithium ion battery cell
Heat temperature raising, at this point, lithium ion battery discharge condition itself heat production simultaneously, lithium ion battery itself heat production and carbon-coating electric-heating thin film
Heat production forms thermal coupling, accelerates lithium ion battery cell temperature rise, after lithium ion battery cell temperature rise, causes under capacity under low temperature
Drop factors are improved, when lithium ion battery cell temperature rise rises to the room temperature working temperature of setting, temperature controller control
It is disconnected, and thermal coupling low-temperature resistance lithium ion battery is under room temperature operating condition and discharges at this time, and discharge performance is significantly improved.
Realize technical solution of the present invention
Thermal coupling low-temperature resistance lithium ion battery includes lithium ion battery, carbon-coating electric-heating thin film.Carbon-coating electric-heating thin film and lithium from
Sub- battery is close to arrangement installation, the circuit access of carbon-coating electric-heating thin film be by the temperature controller outside lithium ion battery involucrum,
According to real time temperature needs, selection control carbon-coating electric-heating thin film is turned on or off with lithium ion battery；Lithium ion battery involucrum, can
Select aluminum-plastic composite membrane or metal shell.Product temperature controller can be selected in temperature controller.
When temperature is lower than -30 DEG C, the temperature controller for controlling the circuit of carbon-coating electric-heating thin film and lithium ion battery is controlled
Conducting, after the conducting of carbon-coating electric-heating thin film and lithium ion battery, carbon-coating electric-heating thin film planar heating and the lithium-ion electric being close to
Pond transmission of heat by contact, lithium ion battery are conducted heat, i.e., temperature rises, at this point, lithium ion battery is conveyed to carbon-coating electric-heating thin film
Simultaneously, the discharge chemistry reaction of itself also synchronizes heat production, the heat production of lithium ion battery and carbon-coating electric-heating thin film planar heating to electric energy
Thermal coupling is formed, the heating effect that thermal coupling is formed rises rapidly the temperature of lithium ion battery, and the temperature of lithium ion battery is fast
After speed rises, the factors that capacity declines under low temperature are caused to be improved, effective discharge capacity rises rapidly, lithium-ion electric
Pond enters room temperature operating condition, at this point, discharge platform and discharge-rate will go back up to the characteristic of room temperature.The temperature of lithium ion battery is returned
When being raised to room temperature operating condition, the circuit on state of carbon-coating electric-heating thin film and lithium ion battery is controlled by temperature controller to be disconnected.
The lithium ion battery, mainly by diaphragm, cathode, anode, diaphragm composition further includes electrolyte and involucrum,
Wherein, cathode, the positive combination number of plies can be determined according to battery capacity.
The diaphragm, it is compound to choose single layer PE, single layer PP, 3 layers of PP/PE/PP, wet process, dry process lithium ion
Battery dedicated diaphragm；
The anode can choose cobalt acid lithium, LiMn2O4, nickel manganese cobalt acid lithium, LiFePO4.
The cathode can choose natural graphite, artificial graphite, interphase microballoon, lithium titanate.
The electrolyte, including lithium perchlorate, six good fortune lithium phosphates, organic solvent include ethylene carbonate, carbonic acid diethyl
Ester, dimethyl carbonate；
The involucrum, can be selected aluminum-plastic composite membrane, metal shell, and involucrum provides not in the drawings；
The carbon-coating electric-heating thin film, including insulating film, carbon material, conductive strips, adhesive composition；
The insulating film forms interlayer by two layers of insulating film, is carbon-coating, conductive strips, adhesive between interlayer；Insulating film choosing
With polyester film, polyester film good mechanical performance, rigidity, hardness and toughness are high, rub resistance, high temperature resistant and low temperature, chemically-resistant
Burn into oil resistant, air-tightness are good, are common barrier film's substrates.
The carbon-coating is mainly made of nano-carbon material, adhesive, and nanometer carbon carbon material chooses carbon nanotube, carbon is received
Rice noodles, carbon black, graphene, or combinations thereof, adhesive chooses polytetrafluoroethylene (PTFE), Kynoar, butadiene-styrene latex derivative wherein
One kind being mixed with film, and the film of preparation is conductive, has heating function when carbon-coating is powered.
The conductive strips, using copper foil material, carbon-coating both ends are connected and are connected by conductive strips.
The adhesive, selection epoxy resin, phenolic resin, Lauxite, polyurethane resin, Pioloform, polyvinyl acetal,
Superchlorinated polyvinyl chloride resin, neoprene, nitrile rubber are one of；It is preferred that polyurethane adhesive, polyurethane adhesive has height
Activity and polarity, the substrates such as polyurethane adhesive and plastics, timber, leather, fabric, paper, ceramics have excellent chemistry
Bonding force.
The interior forward surface of insulating film interlayer is bonded and sealed by polyurethane adhesive, is in carbon-coating, conductive strips by seal shape
State is isolated with keeping carbon-coating, conductive strips to form interlayer ambient atmosphere with two layers of insulating film, thus improve safety, reliability and
Durability.
Positive effect of the invention
A kind of thermal coupling low-temperature resistance lithium ion battery significantly improves under the conditions of increasing small volume and weight
The existing lithium ion battery defect that performance deteriorates at low temperature, to military communication field, radio communication base station power supply and new energy
Source automobile.Especially military communication especially can also provide power supply in extreme climate to battery at a lower temperature and ensure, i.e.,
There is important meaning.
Detailed description of the invention
Fig. 1 is thermal coupling low-temperature resistance lithium ion battery circuit schematic diagram of the present invention；
In figure, V lithium ion battery, R carbon-coating electric-heating thin film, R2K temperature controller, R1Temperature and resistance, the access of T temperature signal
End, J1 temperature controller R2K output control terminal, J2 temperature controller R2K output control terminal, R3Carbon-coating electric-heating thin film R's is controlled
End, R4Carbon-coating electric-heating thin film R power connector end.
Fig. 2 is thermal coupling low-temperature resistance lithium ion battery structure diagram of the present invention；
In figure, R carbon-coating electric-heating thin film, B diaphragm, 1 cathode, 2 anodes, involucrum is not provided in figure；
Fig. 3 is carbon-coating electric-heating thin film configuration diagram；
In figure, it is respectively as follows: Rr1 insulating film, Rr2 carbon-coating, Rr3 conductive strips, Rr4 adhesive, Rr5 insulating film from the bottom to top；
Fig. 4 is Fig. 3 expanded schematic diagram；
In figure, Rr1 insulating film is being pushed up in bottom, Rr5 insulating film, forms sandwich, and Rr2 carbon-coating, Rr3 conductive strips, Rr4 are viscous
Mixture sets interior forward surface in interlayer.
Specific embodiment
It is further described below in conjunction with attached drawing specific embodiment
As shown in Figure 1, temperature controller R2The temperature signal incoming end T of K connects temperature and resistance R1, temperature controller R2K
Input control end J2 connects the power end-of lithium ion battery V, temperature controller R2K output control terminal J1 connects carbon-coating electric heating
The controlled end R of film R3, carbon-coating electric-heating thin film R power connector end R4, with lithium ion battery V power end+connection；
As shown in Fig. 2, the thermal coupling low-temperature resistance lithium ion battery, carbon-coating electric-heating thin film R, diaphragm B, cathode 1, anode
2.Wherein, diaphragm B, cathode 1, anode 2 form lithium ion battery, and carbon-coating electric-heating thin film R is close to the upper and lower of lithium ion battery respectively
Two faces are fixed, and are not provided in thermal coupling low-temperature resistance lithium ion battery involucrum figure.
The cathode 1 can choose natural graphite, artificial graphite, interphase microballoon, lithium titanate one of which；
It is one of can to choose cobalt acid lithium, LiMn2O4, nickel manganese cobalt acid lithium, LiFePO4 for the anode 2；
The diaphragm B, it is compound to choose single layer PE, single layer PP, 3 layers of PP/PE/PP, wet process, dry process lithium ion
Battery dedicated diaphragm；
The combination number of plies of the diaphragm B, cathode 1, anode 2, can need to combine according to battery capacity；
As shown in Figure 3, Figure 4, the carbon-coating electric-heating thin film R, by insulating film Rr1, carbon-coating Rr2, conductive strips Rr3, bonding
Agent Rr4, insulating film Rr5 composition；
Insulating film Rr1, the insulating film Rr5 forms sandwich, is carbon-coating Rr2, conductive strips Rr3, bonding between interlayer
Agent Rr4；Insulating film Rr1, insulating film Rr5 select polyester film.
The carbon-coating Rr2, is mainly made of nano-carbon material, adhesive, and nanometer carbon carbon material chooses carbon nanotube, carbon
Nano wire, carbon black, graphene, or combinations thereof, adhesive choose polytetrafluoroethylene (PTFE), Kynoar, butadiene-styrene latex derivative its
Middle one kind is mixed with film, and the film of preparation is conductive, has heating function when carbon-coating is powered.
The conductive strips Rr3 is copper foil material, and carbon-coating both ends are connected and are connected by conductive strips, and lithium ion battery V is by leading
Electric band constitutes load circuit with carbon-coating.
The adhesive Rr4 chooses epoxy resin, phenolic resin, Lauxite, polyurethane resin, polyvinyl alcohol contracting
Aldehyde, superchlorinated polyvinyl chloride resin, neoprene, nitrile rubber is one of, preferably polyurethane adhesive, and polyurethane adhesive will insulate
Film Rr1 is bonded and sealed with forward surface in insulating film Rr5 interlayer, is in carbon-coating Rr2, conductive strips Rr3 by sealing state, seal shape
Insulating film Rr1, insulating film Rr5 the composition interlayer of state keep carbon-coating Rr2, conductive strips Rr3 and insulating film Rr1, insulating film Rr5 interlayer
Outer gas isolating, to improve safety, reliability and durability.
Thermal coupling low-temperature resistance lithium ion battery working method
Temperature and resistance R1When detecting battery temperature lower than -30 DEG C, temperature controller R2Carbon-coating electric-heating thin film R and lithium is connected in K
Ion battery V-arrangement circuit, lithium ion battery V discharge to carbon-coating electric-heating thin film R, and carbon-coating electric-heating thin film R starts to generate heat, carbon-coating electricity
Hot film R is tightly attached to the two sides for the lithium ion battery V that diaphragm B, Carbon anode 1, anode 2 form, carbon-coating electric-heating thin film R metal surface hair
The heat of heat, the surface carbon-coating electric-heating thin film R is rapidly transferred to lithium ion battery V, under carbon-coating electric-heating thin film R heat effect, lithium
Ion battery V obtains heat, and temperature rises, and lithium ion battery V discharge current is gradually increased, and at the same time, lithium ion battery V exists
Discharge process itself heat production, itself heat production of lithium ion battery V and carbon-coating electric-heating thin film R are thermally formed thermal coupling, make lithium-ion electric
Pond V rate of rise in temperature is further speeded up, when lithium ion battery V temperature rises to set temperature, temperature controller R2K is disconnected
Carbon-coating electric-heating thin film R and lithium ion battery V output circuit, carbon-coating electric-heating thin film R stop working, and lithium ion battery enters normal-temperature
Operating condition.The discharge capacity of lithium ion battery can be restored to room temperature operating condition.
Claims (1)
1. a kind of thermal coupling low-temperature resistance lithium ion battery is mainly controlled by lithium ion battery (V), carbon-coating electric-heating thin film (R), temperature
Device (R2K), temperature and resistance (R1) composition, it is characterized in that:
The lithium ion battery (V) includes diaphragm (B), cathode (1), positive (2) composition；
The cathode (1), can choose natural graphite, artificial graphite, interphase microballoon, lithium titanate；
The anode (2) can choose cobalt acid lithium, LiMn2O4, nickel manganese cobalt acid lithium, LiFePO4；
The diaphragm (B), it is compound to choose single layer PE, single layer PP, 3 layers of PP/PE/PP, wet process, dry process lithium-ion electric
Pond dedicated diaphragm；
The carbon-coating electric-heating thin film (R) is close to the upper and lower surfaces installation of lithium ion battery respectively；
The carbon-coating electric-heating thin film (R), by insulating film (Rr1), carbon-coating (Rr2), conductive strips (Rr3), adhesive (Rr4), absolutely
Velum (Rr5) composition；Insulating film (Rr1) and insulating film (Rr5) form sandwich, carbon-coating (Rr2), conductive strips (Rr3), bonding
Agent (Rr4) is set between interlayer；
The insulating film (Rr1), insulating film (Rr5) select polyester film；
The carbon-coating (Rr2), it is one of including a variety of that carbon material is selected from carbon nanotube, carbon nanocoils, carbon black, graphene
Combination prepares film, conductive, has heating function when carbon-coating (Rr2) is powered.
The conductive strips (Rr3), choose copper foil material, and the carbon-coating both ends (Rr2) are connected and are connected by conductive strips (Rr3)；
The adhesive (Rr4), selection epoxy resin, phenolic resin, Lauxite, polyurethane resin, Pioloform, polyvinyl acetal,
Superchlorinated polyvinyl chloride resin, neoprene, nitrile rubber is one of, preferably polyurethane adhesive, and polyurethane adhesive is by insulating film
(Rr1) it is bonded and sealed with forward surface in insulating film (Rr5) interlayer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711188869.3A CN109841893A (en) | 2017-11-27 | 2017-11-27 | A kind of thermal coupling low-temperature resistance lithium ion battery |
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| CN201711188869.3A CN109841893A (en) | 2017-11-27 | 2017-11-27 | A kind of thermal coupling low-temperature resistance lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635813A (en) * | 2020-12-08 | 2021-04-09 | 隆能科技(南通)有限公司 | Ultralow temperature lithium ion battery and preparation method thereof |
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2017
- 2017-11-27 CN CN201711188869.3A patent/CN109841893A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112635813A (en) * | 2020-12-08 | 2021-04-09 | 隆能科技(南通)有限公司 | Ultralow temperature lithium ion battery and preparation method thereof |
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