CN107615568A - Battery pack - Google Patents
Battery pack Download PDFInfo
- Publication number
- CN107615568A CN107615568A CN201580079443.7A CN201580079443A CN107615568A CN 107615568 A CN107615568 A CN 107615568A CN 201580079443 A CN201580079443 A CN 201580079443A CN 107615568 A CN107615568 A CN 107615568A
- Authority
- CN
- China
- Prior art keywords
- water absorbent
- absorbent polymer
- battery
- battery pack
- polymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/659—Means for temperature control structurally associated with the cells by heat storage or buffering, e.g. heat capacity or liquid-solid phase changes or transition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The present invention provides a kind of battery pack, including battery case and the battery module being arranged in battery case, the battery case seals relative to outside, confining liquid is set in the battery case, the battery module is at least partially immersed in confining liquid, the pick up in water absorbent polymer A, the water absorbent polymer A is added with the confining liquid more than 10%.Technical scheme provided by the invention can effectively suppress the sprawling of battery pack thermal runaway.
Description
The invention discloses a kind of battery packs including thermal control system.
The electric system of energy storage/electric car is made of multiple battery modules, and battery module is made of multiple battery cells.Due to pursuing the energy density of battery pack, closely, so that the heat in battery module is easy accumulation, the intermediate position of especially entire module, temperature is often higher than other positions to the battery cell arrangement in battery module.When part battery cell in module heat accumulation to a certain extent after, the phenomenon that may result in thermal runaway generation.And thermal runaway can be spread in battery module, the battery cell temperature for causing other to work normally increases rapidly so that thermal runaway occurs for entire battery module, this be it is extremely hazardous, especially in closed battery case.
Application No. is CN201280043177.9, the patent application of entitled " battery pack extinguishing device " discloses a kind of device for being able to suppress the battery pack in battery pack kindling and fire occurring.The extinguishing device includes: fire detection sensor, whether being used to detect battery pack kindling；Foamite container, inside it space extinguishing chemical；And control unit, the inside for being used to make the extinguishing chemical in the foamite container be injected into the battery pack when detecting that fire occurs by the fire detection sensor.
Whether fire detection sensor in the patent catches fire for monitoring cell group, it was demonstrated that its extinguishing device occurs open fire in battery pack and just starts to work.In fact, battery pack is smoldered in taking the form of for thermal runaway initial stage, the battery cell temperature for showing manifest symptom rises violently rapidly, once thermal runaway takes place in some battery cell, just it is constantly be generated thermal energy and these healthy battery cells may be made to enter thermal runaway by adjacent cell Unit heating to the critical-temperature for being higher than thermal runaway.This phenomenon, which can be spread rapidly, constantly generates heat, until by other adjacent cell Unit heatings to thermal runaway state.
Application No. is CN201410186474.X, a kind of battery case is disclosed in the patent application of entitled " a kind of high waterproof thermal-insulated battery case of electric car ", it includes the cabinet and the intracorporal several battery units of case of sealing, further includes being set to the radiator being connected in cabinet and with several battery units.Heating device is arranged in each battery unit, the battery case controller being connected by control circuit with heating device is also set up in the cabinet, it is every piece of battery cell module heat dissipation that hollow heat sink, which has also been devised, guarantees battery cell module heat dissipation uniformly, improves radiating efficiency.Technical solution disclosed in the patent can solve the temperature uniformity problem of battery pack battery cell in normal operating conditions, but since heat sink plays heat conduction, once some battery cell occurs
Thermal runaway, heat can be rapidly transferred to other normal battery monomers, thermal runaway caused to spread rapidly.
In the prior art, in order to preferably control the temperature of battery pack, have by the way that cooling loop is arranged between battery cell, reduce each battery cell temperature difference in battery module, also there is the extinguishing device that connection is set outside battery case.Extinguishing device or similar device are set in battery pack system, and only a kind of remedial measure after the generation of battery pack thermal runaway, can not be effectively controlled budding state for thermal runaway.And cooling device is designed in battery pack system, usually there are free air cooling and liquid two kinds cooling, air quantity relative efficacy is poor, and liquid cooling is in order to reach preferable heat dissipation effect, often need for battery module to be immersed in coolant liquid, for the security performance of battery pack, the liquid for usually selecting insulation performance relatively good, and the thermal capacitance value of these insulating and cooling liquids is lower, boiling point is higher, also it is difficult to undergo phase transition at a temperature of battery pack thermal runaway, the heat of generation is difficult to take away rapidly when temperature steeply rises.More disadvantageously, if insulating and cooling liquid temperature rises rapidly, the effect of one " oil bath " can be also played, other batteries worked normally are also heated to the state of thermal runaway, to bring graver results.
Occur to take positive remedial measure after thermal runaway in battery pack, a kind of method for controlling thermal runaway of can yet be regarded as.Although above-mentioned remedial measure can play certain effect, serious danger will not be brought, the battery pack after thermal runaway also will be unable to work normally, and bring serious loss.If can inhibit thermal runaway during temperature early period rises not only to control dangerous generation in budding state, unnecessary loss is also greatly reduced.
Summary of the invention
The present invention provides a kind of battery packs including thermal control system, including battery case and the battery module being arranged in battery case, the battery case is sealed relative to outside, confining liquid is set in the battery case, the battery module is at least partially immersed in confining liquid, water absorbent polymer A is added in the confining liquid, the imbibition rate of the water absorbent polymer A is 10% or more.
The electric component of battery pack is all closed by confining liquid, is allowed to be isolated from the outside world, air is avoided to damage electric component.Under the premise of herein, if battery pack leaks, the liquid leaked out is flowed into confining liquid, is closed liquid and is closed, avoids air from being in contact with it and react.
Further, the imbibition rate of the water absorbent polymer A is 50% or more, and the imbibition rate of the more preferable water absorbent polymer A is 100% or more.
Preferably, water absorbent polymer B is further added in above-mentioned confining liquid, the imbibition rate of the water absorbent polymer B is less than 50%；It is preferred that the imbibition rate of the water absorbent polymer B is less than 20%；It is highly preferred that the water suction
The imbibition rate of polymer B is 0.
It is 5~200:1 that the additive amount of water absorbent polymer A and water absorbent polymer B, which meet the mass ratio of pure water absorbent polymer A and pure water absorbent polymer B, in the confining liquid, and the mass ratio of more preferable pure water absorbent polymer A and pure water absorbent polymer B is 10~100:1；Wherein, the quality of pure water absorbent polymer A or pure water absorbent polymer B refer to that water absorbent polymer A or water absorbent polymer B do not absorb the quality of any liquid, the i.e. quality of straight polymer.
In the present invention, imbibition rate refers to the liquid and the mass percent for not absorbing the water absorbent polymer before liquid, i.e. imbibition rate=W that water absorbent polymer absorbs1(liquid quality)/W2(quality of water absorbent polymer before absorbing water) × 100%.Wherein, W1(liquid quality)=W3(quality of water absorbent polymer after water suction)-W2(quality of water absorbent polymer before absorbing water).
A kind of embodiment according to the present invention, confining liquid include the flame-resistant insulation liquid that freezing point is higher than 60 DEG C lower than -30 DEG C, decomposition temperature.Another embodiment according to the present invention, confining liquid include the flame-resistant insulation liquid that freezing point is higher than 60 DEG C lower than -30 DEG C, boiling point.
Confining liquid is the cooling liquid with insulation, flame retardant property, while having the freezing point lower than -30 DEG C, boiling point or decomposition temperature higher than 60 DEG C.In general, the normal working temperature of battery pack is not higher than 60 DEG C, therefore the decomposition temperature of confining liquid should be higher than 60 DEG C.Above-mentioned flame-resistant insulation liquid can be selected from least one of silicone oil, transformer oil, fluorochlorohydrocarbon, fluorohydrocarbon, chlorohydrocarbon and hydrofluoroether.
Silicone oil, transformer oil etc. have preferable insulation performance, while stability also with higher.Battery module and electric component are immersed in confining liquid to the damage that can be avoided external aqueous vapor, prolonged the service life；And thermally conductive effect is also acted, the temperature for being conducive to internal battery pack is uniform.
Water absorbent polymer A and/or water absorbent polymer B in the present invention are usually to have hydrophilic radical, largely can absorb moisture and be swollen and be able to maintain the polymer that moisture does not outflow.As long as purpose according to the present invention is appreciated that polymer can absorbing water or aqueous solution and insoluble or sl. sol. with confining liquid can be used as water absorbent polymer of the invention and use, and reaches technical effect of the invention.A kind of embodiment according to the present invention, above-mentioned water absorbent polymer A and/or water absorbent polymer B can be independently selected from least one of acrylic polymer, acrylamide copolymer, starch based polymers, acrylonitrile polymers, cellulosic polymer, vinyl alcohol polymer and polyoxyethylene quasi polymers.
Preferably, above-mentioned water absorbent polymer A and/or water absorbent polymer B can be independently selected from: crosslinked salt polyacrylate, polyacrylate, polyacrylate grafting polymer, saponified vinyl acetate-acrylate copolymer, vinyl alcohol-acrylates cross-linked copolymer, hydrolyzed acrylamide copolymer, graft acrylamide polymer,
Cross-linking type hydroxyethyl cellulose graft acrylamide polymer, starch-acrylate graft copolymer, starch grafted acrylate quasi polymer, Starch-Acrylontirile Graft Copolymer, hydrolyzed acrylonitrile copolymer, high substituted degree cross-linked carboxymethyl cellulose, cross-linked carboxymethyl cellulose graft acrylamide, cross-linked carboxymethyl cellulose alkali metal salt, with the cross-linked polymer of cis-1 grafted polyvinyl alcohol, ethylene maleic acid anhydride copolymer, isobutyiene-maieic anhydride copolymer, poly- (vinyl sulfonic acid ester), poly- (vinylphosphonate), poly- (vinyl phosphate), poly- (vinylsulfuric acid ester), sulfonated polystyrene, polyvinylamine, poly-diakyl aminoalkyl (methyl) acrylamide, polyethyleneimine, polyarylamine, poly- aryl guanidine, poly dimethyl diaryl ammonium hydroxide, quaternized polystyrene spreads out At least one of biology, guanidine modified polystyrene, quaternized poly- (methyl) acrylamide, polyethylene guanidine etc..Purpose according to the present invention, water absorbent polymer A and water absorbent polymer B may be the same or different.
Water absorbent polymer is generally the polyelectrolyte containing hydrophilic radical and cross-linked structure.Before water suction, macromolecular chain mutually draws close tangle up, is cross-linked to each other and reticulates structure, to reach fastening on the whole.When contacting with water, hydrone is through capillary action and diffusion penetrates into resin, and the ionizing group on chain ionizes in water.Due to making macromolecular chain stretching, extension swelling on chain with the electrostatic repulsion between ion.Due to electroneutral requirement, counter ion cannot be moved to outside resin, and the ion concentration difference between the solution of resin inside and outside forms reverse osmotic pressure.Water travels further into resin under the action of reverse osmotic pressure, forms hydrogel.
Water absorbent polymer is absorbable to be equivalent to own wt hundred times to thousands of times of water, and rate of water absorption is fast, is not easy to release after water suction.And the absorbent liquid of water-absorbing resin institute is not limited only to water, also has very strong absorbability for other kinds of liquid.
The liquid absorbed in a kind of embodiment according to the present invention, the water absorbent polymer A and/or water absorbent polymer B is selected from least one of water and aqueous solution.The aqueous solution preferably dissolves solution obtained from other high specific heat capacity substances in water.
Water and the aqueous solution as obtained from dissolving other high specific heat capacity substances in water all have higher specific heat capacity, and the boiling point of the water or aqueous solution in the present invention is below the temperature that thermal runaway occurs for battery pack, water or aqueous solution will be undergone phase transition before thermal runaway is further spread, more heats can be absorbed, a wide range of sprawling of thermal runaway in battery pack can be more efficiently controlled.
The liquid absorbed in a kind of embodiment according to the present invention, the water absorbent polymer A and/or water absorbent polymer B is water or aqueous solution；The aqueous solution is selected from the aqueous solution of alcohol；The alcohol can be selected from least one in ethylene glycol, 1,2- ethylidene glycol, propylene glycol, 1,3-BDO, hexylene glycol, diethylene glycol (DEG), glycerine etc.
Kind.Freezing point can be effectively reduced in the aqueous solution of above-mentioned substance, promotes the working performance in low temperature environment.
Water absorbent polymer A and/or water absorbent polymer B, water absorbent polymer A and water absorbent polymer B insoluble or slightly soluble and holding stabilization in confining liquid are added in confining liquid.Imbibition rate of imbibition rate of the imbibition rate of water absorbent polymer A in 10% or more, preferably water absorbent polymer A in 50% or more, more preferable water absorbent polymer A is 100% or more.It is gathered in battery module amount of localized heat, when temperature increases rapidly and local thermal runaway occurs, the heat that confining liquid is not enough to quickly to generate is taken away, liquid (such as water or aqueous solution) in water absorbent polymer A can be brought rapidly up then phase transformation and absorb a large amount of heat, the temperature in battery pack is controlled, the further sprawling of thermal runaway is avoided.
Confining liquid may contain a certain amount of moisture, this can reduce the insulation performance of entire battery pack after prolonged use.Imbibition rate is set in confining liquid in 20% water absorbent polymer B below, is conducive to remove water confining liquid, battery pack is made to keep preferable insulation performance.
Purpose according to the present invention, when being added to water absorbent polymer A (and water absorbent polymer B) in confining liquid, in order to guarantee that temperature controlled effect in battery pack, the amount of water absorbent polymer A should be greater than the amount of water absorbent polymer B.
A kind of embodiment according to the present invention, it is separated between the water absorbent polymer A and/or water absorbent polymer B and battery module by porous layer, the porous layer contacts water absorbent polymer A and/or water absorbent polymer B directly with battery module, and the liquid and confining liquid absorbed in water absorbent polymer A and/or water absorbent polymer B can pass freely through porous layer.
Above-mentioned porous layer is selected from least one of non-woven fabrics, perforated membrane and mesh etc..In concrete operations, it can be then placed in the confining liquid in battery case by water absorbent polymer A and/or water absorbent polymer B packet in the porous layers such as non-woven fabrics.
Preferably, battery module upside down in battery case, so that the tab of the battery module is immersed in confining liquid.
Battery cell upside down refers to battery cell tab downward, so electrode can also be immersed in confining liquid when using less confining liquid.The calorific value of tab is relatively large for battery cell, is dipped in confining liquid and is more advantageous to heat dissipation, and is also beneficial to the insulation of battery module.
For flexible-packed battery, the package position of tab is relatively easy to that the position of cut occurs, the active material of inside battery is easier to flow out from this cut, battery cell inversion is advantageously reduced into the leak materials exposure aerial time, once leaking, it is allowed to flow into confining liquid rapidly, improves security performance.
Technical solution disclosed by the invention can more effectively control the sprawling of battery module thermal runaway.When battery cores certain in battery module go wrong, the amount of heat of generation increases local temperature rapidly, at this time water absorbent polymer
A large amount of heat can be absorbed in the liquid absorbed in A and/or water absorbent polymer B, heat is taken away using liquid phase-change, is risen rapidly to effectively control temperature in battery module, so that the temperature in battery pack is controlled effectively, the sprawling for preventing thermal runaway, loss is reduced to minimum.
Fig. 1 is a kind of structural schematic diagram of embodiment of battery pack disclosed by the invention；
Fig. 2 is a kind of structural schematic diagram of the water absorbent polymer A packet disclosed by the invention in porous layer；
Fig. 3 is a kind of structural schematic diagram of the water absorbent polymer B packet disclosed by the invention in porous layer；
Fig. 4 is the structural schematic diagram of the another embodiment of battery pack disclosed by the invention；
Fig. 5 is the structural schematic diagram of the another embodiment of battery pack disclosed by the invention；
Fig. 6 is a kind of structural schematic diagram of water absorbent polymer A and water absorbent polymer B packet disclosed by the invention in porous layer；
Wherein, 1. battery case, 11. porous layers, 12. water absorbent polymer A, 13. water absorbent polymer B, 14. confining liquids, 2. battery modules.
Embodiment 1
Such as Fig. 1, Fig. 2, shown in Fig. 3, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, porous layer 11 is also set up in confining liquid 14, water absorbent polymer A12 and water absorbent polymer B13, water absorbent polymer A12 and water absorbent polymer B13 are insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 20% or more, the imbibition rate of water absorbent polymer B13 is below 20%.
Water absorbent polymer A12 is arranged in porous layer 11, water absorbent polymer B13 is arranged in other non-porous layers 11 for accommodating water absorbent polymer A12, porous layer 11 pass and flow into confining liquid 14 can in porous layer 11, but also water absorbent polymer A12, water absorbent polymer B13 cannot pass through, to limit the position of water absorbent polymer A12 and water absorbent polymer B13, it is not allowed directly to contact with live part/electric component of battery cell, porous layer 11 selects non-woven fabrics.
Confining liquid 14 may suck a certain amount of moisture after prolonged use, this can reduce the insulation performance of entire battery pack, and imbibition rate is arranged in confining liquid 14 in 20% water absorbent polymer B13 below, has
Dehumidifying is carried out conducive to confining liquid 14, keeps preferable insulation performance.When locally thermal runaway occurs for battery module 2, the moisture in water absorbent polymer A12, water absorbent polymer B13 mutually becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
In addition, the mass ratio of pure water absorbent polymer A12 and pure water absorbent polymer B13 are 8 in the present embodiment.
Liquid in water absorbent polymer A12 and water absorbent polymer B13 is glycol water, and water absorbent polymer A12, water absorbent polymer B13 are crosslinked salt polyacrylate, using silicone oil as confining liquid 14.
Embodiment 2
Such as Fig. 1, Fig. 2, shown in Fig. 3, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, porous layer 11 is also set up in confining liquid 14, water absorbent polymer A12 and water absorbent polymer B13, water absorbent polymer A12 and water absorbent polymer B13 are insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 50% or more, the imbibition rate of water absorbent polymer B13 is below 20%.
Water absorbent polymer A12 is arranged in porous layer 11, water absorbent polymer B13 is arranged in other non-porous layers 11 for accommodating water absorbent polymer A12, porous layer 11 pass and flow into confining liquid 14 can in porous layer 11, but also water absorbent polymer A12, water absorbent polymer B13 cannot pass through, to limit the position of water absorbent polymer A12 and water absorbent polymer B13, it is not allowed directly to contact with live part/electric component of battery cell, porous layer 11 selects non-woven fabrics.
Confining liquid 14 is after prolonged use, a certain amount of moisture may be sucked, this can reduce the insulation performance of entire battery pack, and imbibition rate is arranged in confining liquid 14 in 20% water absorbent polymer B13 below, be conducive to carry out dehumidifying to confining liquid 14, keep preferable insulation performance.When locally thermal runaway occurs for battery module 2, the water phase in water absorbent polymer A12, water absorbent polymer B13 becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
In addition, the mass ratio of pure water absorbent polymer A12 and pure water absorbent polymer B13 are 20 in the present embodiment.
Liquid in water absorbent polymer A12 and water absorbent polymer B13 is 1,2- ethylene alcohol solution, and water absorbent polymer A12, water absorbent polymer B13 are vinyl alcohol-acrylates cross-linked copolymer, using silicone oil as confining liquid 14.
Embodiment 3
Such as Fig. 1, Fig. 2, shown in Fig. 3, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, porous layer 11 is also set in confining liquid 14, water absorbent polymer A12 and water absorbent polymer B13, water absorbent polymer A12 and water absorbent polymer B13 are insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 80% or more, the imbibition rate of water absorbent polymer B13 is below 10%.
Water absorbent polymer A12 is arranged in porous layer 11, water absorbent polymer B13 is arranged in other non-porous layers 11 for accommodating water absorbent polymer A12, porous layer 11 pass and flow into confining liquid 14 can in porous layer 11, but also water absorbent polymer A12, water absorbent polymer B13 cannot pass through, to limit the position of water absorbent polymer A12 and water absorbent polymer B13, it is not allowed directly to contact with live part/electric component of battery cell, porous layer 11 selects non-woven fabrics.
Confining liquid 14 is after prolonged use, a certain amount of moisture may be sucked, this can reduce the insulation performance of entire battery pack, and imbibition rate is arranged in confining liquid 14 in 10% water absorbent polymer B13 below, be conducive to carry out dehumidifying to confining liquid 14, keep preferable insulation performance.When locally thermal runaway occurs for battery module 2, the water phase in water absorbent polymer A12, water absorbent polymer B13 becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
In addition, the mass ratio of pure water absorbent polymer A12 and pure water absorbent polymer B13 are 10 in the present embodiment.
Liquid in water absorbent polymer A12 and water absorbent polymer B13 is water, and water absorbent polymer A12, water absorbent polymer B13 are vinyl alcohol-acrylates cross-linked copolymer, using silicone oil as confining liquid 14.
Embodiment 4
As shown in Figure 4, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, water absorbent polymer A12 and water absorbent polymer B13 are also set up in confining liquid 14, water absorbent polymer A12 and water absorbent polymer B13 are insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 80% or more, the imbibition rate of water absorbent polymer B13 is below 10%.
Confining liquid 14 may suck a certain amount of moisture after prolonged use, this can be reduced entirely
The insulation performance of battery pack is arranged imbibition rate in 10% water absorbent polymer B13 below in confining liquid 14, is conducive to carry out dehumidifying to confining liquid 14, keeps preferable insulation performance.When locally thermal runaway occurs for battery module 2, the water phase in water absorbent polymer A12, water absorbent polymer B13 becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
In addition, the mass ratio of pure water absorbent polymer A12 and pure water absorbent polymer B13 are 10 in the present embodiment.
Liquid in water absorbent polymer A12 and water absorbent polymer B13 is aqueous solution of propylene glycol, and water absorbent polymer A12, water absorbent polymer B13 are vinyl alcohol-acrylates cross-linked copolymer, using silicone oil as confining liquid 14.
Embodiment 5
As shown in Figure 5, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, water absorbent polymer A12 is also set up in confining liquid 14, water absorbent polymer A12 is insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 80% or more.
When locally thermal runaway occurs for battery module 2, the water phase in water absorbent polymer A12 becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
Liquid in water absorbent polymer A12 is aqueous solution of propylene glycol, and water absorbent polymer A12 is vinyl alcohol-acrylates cross-linked copolymer, using silicone oil as confining liquid 14.
Embodiment 6
Such as Fig. 1, shown in Fig. 6, the present invention discloses a kind of battery pack, including battery case 1 and battery module 2, battery case 1 is sealed relative to outside, confining liquid 14 is also set up in battery case 1, battery module 2, which is inverted, to be arranged in battery case 1, so that the tab of battery module 2 is immersed in confining liquid 14, battery module 2, electric component in battery case 1 immerses in confining liquid 14, tab position and afflux position especially in battery module 2, porous layer 11 is also set up in confining liquid 14, water absorbent polymer A12 and water absorbent polymer B13, water absorbent polymer A12 and water absorbent polymer B13 are insoluble in confining liquid 14, the imbibition rate of water absorbent polymer A12 is 20% or more, the imbibition rate of water absorbent polymer B13 is below 20%.
Water absorbent polymer A12 and water absorbent polymer B13 is arranged in same porous layer, porous layer 11 pass and flow into confining liquid 14 can in porous layer 11, but also water absorbent polymer A12, water absorbent polymer B13 cannot pass through, to limit the position of water absorbent polymer A12 and water absorbent polymer B13, itself and battery list are not allowed
Live part/electric component of body directly contacts, and porous layer 11 selects non-woven fabrics.
Confining liquid 14 is after prolonged use, a certain amount of moisture may be sucked, this can reduce the insulation performance of entire battery pack, and imbibition rate is arranged in confining liquid 14 in 20% water absorbent polymer B13 below, be conducive to carry out dehumidifying to confining liquid 14, keep preferable insulation performance.When locally thermal runaway occurs for battery module 2, the moisture in water absorbent polymer A12, water absorbent polymer B13 mutually becomes vapor, quickly absorbs heat, avoids the sprawling of thermal runaway.
In addition, the mass ratio of pure water absorbent polymer A12 and pure water absorbent polymer B13 are 8 in the present embodiment.Liquid in water absorbent polymer A12 and water absorbent polymer B13 is glycol water, and water absorbent polymer A12, water absorbent polymer B13 are crosslinked salt polyacrylate, using silicone oil as confining liquid 14.
Claims (14)
- A kind of battery pack, including battery case and the battery module being arranged in battery case, the battery case is sealed relative to outside, it is characterized by: confining liquid is arranged in the battery case, the battery module is at least partially immersed in confining liquid, water absorbent polymer A is added in the confining liquid, the imbibition rate of the water absorbent polymer A is 10% or more.
- Battery pack according to claim 1, it is characterised in that: the imbibition rate of the water absorbent polymer A is 50% or more, and the imbibition rate of the more preferable water absorbent polymer A is 100% or more.
- Battery pack according to claim 1, it is characterised in that: water absorbent polymer B is further added in the confining liquid, the imbibition rate in the water absorbent polymer B is less than 50%, and the imbibition rate in the more preferable water absorbent polymer B is less than 20%.
- Battery pack according to claim 3, it is characterised in that: it is 5~200:1 that the additive amount of water absorbent polymer A and water absorbent polymer B, which meet the mass ratio of pure water absorbent polymer A and pure water absorbent polymer B, in the confining liquid.
- Battery pack according to claim 1, it is characterised in that: the confining liquid includes the flame-resistant insulation liquid that freezing point is higher than 60 DEG C lower than -30 DEG C, decomposition temperature.
- Battery pack according to claim 5, it is characterised in that: the flame-resistant insulation liquid is selected from least one of silicone oil, transformer oil, fluorochlorohydrocarbon, fluorohydrocarbon, chlorohydrocarbon and hydrofluoroether.
- - 6 any battery pack according to claim 1, it is characterised in that: the water absorbent polymer A and/or water absorbent polymer B is selected from least one of acrylic polymer, acrylamide copolymer, starch based polymers, acrylonitrile polymers, cellulosic polymer, vinyl alcohol polymer and polyoxyethylene quasi polymer.
- - 6 any battery pack according to claim 1, it is characterized by: the water absorbent polymer A and/or water absorbent polymer B is selected from crosslinked salt polyacrylate, polyacrylate, polyacrylate grafting polymer, saponified vinyl acetate-acrylate copolymer, vinyl alcohol-acrylates cross-linked copolymer, hydrolyzed acrylamide copolymer, graft acrylamide polymer, cross-linking type hydroxyethyl cellulose graft acrylamide polymer, starch-acrylate graft copolymer, starch grafted acrylate quasi polymer, Starch-Acrylontirile Graft Copolymer, hydrolyzed acrylonitrile copolymer, high substituted degree cross-linked carboxymethyl cellulose, cross-linked carboxymethyl cellulose graft acrylamide, cross-linked carboxymethyl cellulose alkali metal salt, with the cross-linked polymer of cis-1 grafted polyvinyl alcohol, ethylene maleic acid anhydride copolymer , isobutyiene-maieic anhydride copolymer, poly- (vinyl sulfonic acid ester), poly- (vinylphosphonate), poly- (vinyl phosphate), poly- (vinylsulfuric acid ester), sulfonated polystyrene, polyvinylamine, At least one of poly-diakyl aminoalkyl (methyl) acrylamide, polyethyleneimine, polyarylamine, poly- aryl guanidine, poly dimethyl diaryl ammonium hydroxide, quaternized polystyrene derivative, guanidine modified polystyrene, quaternized poly- (methyl) acrylamide, polyethylene guanidine etc..
- - 6 any battery pack according to claim 1, it is characterised in that: the liquid absorbed in the water absorbent polymer A and/or water absorbent polymer B is selected from least one of water and aqueous solution.
- Battery pack according to claim 9, it is characterised in that: the aqueous solution is selected from the aqueous solution of alcohol.
- Battery pack according to claim 10, it is characterised in that: the alcohol is selected from least one of glycol water, 1,2- ethylidene glycol, propylene glycol, 1,3-BDO, hexylene glycol, diethylene glycol (DEG) and glycerine.
- - 6 any battery pack according to claim 1, it is characterized by: being separated between the water absorbent polymer A and/or water absorbent polymer B and battery module by porous layer, the porous layer contacts water absorbent polymer A and/or water absorbent polymer B directly with battery module, and the liquid and confining liquid absorbed in water absorbent polymer A and/or water absorbent polymer B can pass freely through.
- Battery pack according to claim 12, it is characterised in that: the porous layer is selected from least one of non-woven fabrics, perforated membrane and mesh.
- Battery pack according to claim 1, it is characterised in that: battery module upside down in battery case, so that the tab of the battery module is immersed in confining liquid.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2015/083135 WO2017000293A1 (en) | 2015-07-02 | 2015-07-02 | Battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107615568A true CN107615568A (en) | 2018-01-19 |
| CN107615568B CN107615568B (en) | 2020-09-15 |
Family
ID=57607552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580079443.7A Active CN107615568B (en) | 2015-07-02 | 2015-07-02 | Battery pack |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107615568B (en) |
| WO (1) | WO2017000293A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102020007367A1 (en) | 2020-12-03 | 2022-06-09 | Mercedes-Benz Group AG | Device for immersion cooling of at least one cell module |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4883726A (en) * | 1986-05-23 | 1989-11-28 | Emanuel Peled | Multi-cell battery |
| CN202817051U (en) * | 2012-09-13 | 2013-03-20 | 微宏动力系统（湖州）有限公司 | High-capacity lithium ion battery |
| CN103208598A (en) * | 2012-01-16 | 2013-07-17 | 微宏动力系统（湖州）有限公司 | Battery pack and leakage detection method for same |
| CN103458976A (en) * | 2011-02-09 | 2013-12-18 | 罗伯特·博世有限公司 | Composition for extinguishing and/or retarding fires containing fluorine and/or phosphorus |
| CN203367445U (en) * | 2013-06-17 | 2013-12-25 | 台湾神户电池股份有限公司 | Wet type battery pack |
| CN103682188A (en) * | 2012-08-31 | 2014-03-26 | 微宏动力系统（湖州）有限公司 | Flame-retardant explosion-proof battery pack |
-
2015
- 2015-07-02 CN CN201580079443.7A patent/CN107615568B/en active Active
- 2015-07-02 WO PCT/CN2015/083135 patent/WO2017000293A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4883726A (en) * | 1986-05-23 | 1989-11-28 | Emanuel Peled | Multi-cell battery |
| CN103458976A (en) * | 2011-02-09 | 2013-12-18 | 罗伯特·博世有限公司 | Composition for extinguishing and/or retarding fires containing fluorine and/or phosphorus |
| CN103208598A (en) * | 2012-01-16 | 2013-07-17 | 微宏动力系统（湖州）有限公司 | Battery pack and leakage detection method for same |
| CN103682188A (en) * | 2012-08-31 | 2014-03-26 | 微宏动力系统（湖州）有限公司 | Flame-retardant explosion-proof battery pack |
| CN202817051U (en) * | 2012-09-13 | 2013-03-20 | 微宏动力系统（湖州）有限公司 | High-capacity lithium ion battery |
| CN203367445U (en) * | 2013-06-17 | 2013-12-25 | 台湾神户电池股份有限公司 | Wet type battery pack |
Non-Patent Citations (1)
| Title |
|---|
| 冯晓琦: "改性高分子吸水灭火剂的制备及在灭火方面的应用", 《中国优秀硕士学位论文全文数据库 工程科技Ⅰ辑》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017000293A1 (en) | 2017-01-05 |
| CN107615568B (en) | 2020-09-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107710493B (en) | Battery pack and battery pack system | |
| CN106575775B (en) | Covalently cross-linked gel electrolyte | |
| Shi et al. | Sandwich-like heat-resistance composite separators with tunable pore structure for high power high safety lithium ion batteries | |
| Shi et al. | Polyimide matrix-enhanced cross-linked gel separator with three-dimensional heat-resistance skeleton for high-safety and high-power lithium ion batteries | |
| CN103779527B (en) | A kind of barrier film and preparation method thereof | |
| CN103421208B (en) | Irradiation cross-linking lithium-ion battery diaphragm and preparation method thereof | |
| CN107851861B (en) | Battery pack | |
| CN102263290B (en) | Polymer battery and preparation method thereof | |
| CN102891334B (en) | A kind of lithium ion battery and preparation method thereof | |
| CN103531736A (en) | High-heat-resistance lithium-ion battery diaphragm and preparation method thereof | |
| IL113668A (en) | Crosslinked hybrid electrolyte film its production and a battery cell comprising it | |
| KR20160077118A (en) | Laminate porous film, separator for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery | |
| US3418168A (en) | Fuel cell with water removing means at cathode | |
| CN107615568A (en) | Battery pack | |
| CN109659473A (en) | A kind of method of radiation modification lithium ion battery separator | |
| CN103123958A (en) | Solid nano porous membrane with temperature sensitive response characteristics and preparation method thereof | |
| JPH0279363A (en) | Separator for metal-air type electrochemical battery having alkaline electrolyte | |
| JP6064087B2 (en) | ANION EXCHANGE ELECTROLYTE MEMBRANE, MEMBRANE-ELECTRODE ASSEMBLY FOR FUEL CELL HAVING THE SAME, AND FUEL CELL | |
| KR100607347B1 (en) | High-molecular gelling agent precursor for electrolyte, producing process thereof, high-molecular gelling agent for electrolyte and producing process thereof | |
| Bag et al. | Chiral chemical absorption property of a cross‐linked poly (N‐isopropyl acrylamide‐co‐sodium acrylate) thermoresponsive smart gel | |
| JP7186603B2 (en) | Separator coating liquid, separator manufacturing method, and separator obtained by the manufacturing method | |
| JPH10101886A (en) | Gel-like composition and battery | |
| JP3895299B2 (en) | Cooling gel sheet | |
| CN110957524A (en) | High-capacity lithium ion battery and preparation method thereof | |
| KR20230148731A (en) | Battery pack |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230803 Address after: 12603 Southwest Avenue, 300 blocks, Stanford, Texas, United States Patentee after: MICROVAST, Inc. Address before: 313000 No. 2198 Hongfeng Road, Huzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: MICROVAST POWER SYSTEMS Co.,Ltd. |
|
| TR01 | Transfer of patent right |