CN220121976U - Fireproof heat-preserving battery pack box - Google Patents
Fireproof heat-preserving battery pack box Download PDFInfo
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- CN220121976U CN220121976U CN202321170254.9U CN202321170254U CN220121976U CN 220121976 U CN220121976 U CN 220121976U CN 202321170254 U CN202321170254 U CN 202321170254U CN 220121976 U CN220121976 U CN 220121976U
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- 229920002396 Polyurea Polymers 0.000 claims abstract description 82
- 239000002131 composite material Substances 0.000 claims abstract description 69
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 31
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 31
- 239000004964 aerogel Substances 0.000 claims abstract description 16
- 239000002245 particle Substances 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 134
- 229910052782 aluminium Inorganic materials 0.000 claims description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 25
- 238000004321 preservation Methods 0.000 claims description 20
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 230000009970 fire resistant effect Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 229920000728 polyester Polymers 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims 3
- 238000009413 insulation Methods 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 13
- 238000005507 spraying Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 15
- 230000000694 effects Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000004088 simulation Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000004965 Silica aerogel Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 125000003118 aryl group Chemical group 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000011241 protective layer Substances 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- XMWRBQBLMFGWIX-UHFFFAOYSA-N C60 fullerene Chemical compound C12=C3C(C4=C56)=C7C8=C5C5=C9C%10=C6C6=C4C1=C1C4=C6C6=C%10C%10=C9C9=C%11C5=C8C5=C8C7=C3C3=C7C2=C1C1=C2C4=C6C4=C%10C6=C9C9=C%11C5=C5C8=C3C3=C7C1=C1C2=C4C6=C2C9=C5C3=C12 XMWRBQBLMFGWIX-UHFFFAOYSA-N 0.000 description 1
- 239000004966 Carbon aerogel Substances 0.000 description 1
- 229920000805 Polyaspartic acid Polymers 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910003472 fullerene Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 108010064470 polyaspartate Proteins 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
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Abstract
The utility model relates to a fireproof heat-insulating battery pack box body, which mainly solves the problems that the heat insulation and the fireproof performance of the battery pack box body are poor, and the appearance of a polyurethane foam spray coating is uneven to influence the assembly of a battery module in the prior art. The utility model discloses a fireproof heat-insulating battery pack box body, which comprises an upper cover (7), a lower shell (1) and a fireproof heat-insulating layer (9) arranged at least on the bottom wall of the inner side of the lower shell (1), wherein the fireproof heat-insulating layer (9) comprises a bonding layer (2), a first polyurea composite layer (3), a polyurethane foam layer (4) and a second polyurea composite layer (5) from outside to inside in sequence; the first polyurea composite layer (3) and the second polyurea composite layer (5) are the technical scheme of the polyurea composite layer containing aerogel particles, so that the problem is well solved, and the method can be used in industrial application of new energy automobile battery packs.
Description
Technical Field
The utility model relates to the field of new energy automobiles, in particular to a fireproof heat-preserving battery pack box body.
Background
In recent years, with continuous consumption of traditional energy, international energy supply is continuously tensioned, and global environment protection is increasingly promoted, so that technology and industrialization development of new energy automobiles are increasingly emphasized. The new energy automobile has the advantages of zero emission, low noise, low use cost and the like, and becomes the choice of more and more people. The new energy automobile relies on the battery package of carrying to provide the electric energy, and the casing of current battery package generally uses metal material based on intensity consideration, but the coefficient of heat conductivity of metal material casing is generally great, and the battery package heat preservation effect is poor, and the temperature of battery package changes along with ambient temperature changes. The temperature has a great influence on the charge and discharge performance of the lithium battery, proper temperature is a key for keeping the performance of the lithium battery, and in reality, when the environment temperature of the new energy electric vehicle is low, the endurance mileage of the battery is seriously reduced, so that the popularization of the new energy electric vehicle in a cold area is slow. Therefore, it is important to provide a battery pack case with fireproof and thermal insulation properties.
Chinese patent CN113839136a discloses an application of a battery box, an electric automobile, a mixed material containing polyurea and aerogel, the battery box is formed by sealing a lower box body and an upper cover, the lower box body comprises an outer box body and an inner box body, an aerogel layer is crimped between the outer box body and the inner box body, the prepared battery box has extremely strong impact resistance and impact resistance, but the physical properties and heat insulation properties of related materials are not specifically disclosed, and excessive hierarchical structures may cause excessive increase of box cost and weight, so that the battery box cannot be practically applied.
Chinese patent CN115566352a discloses an upper case cover of a battery case, a battery pack and an electric vehicle, wherein the upper case cover comprises a case cover shell, a heat insulation layer and a protective layer, the heat insulation layer and the protective layer are sequentially covered and fixed on one side of the case cover shell facing the lower case body, the case cover shell is made of a nonmetallic composite material, and the heat insulation layer is preferably a polymer foaming material layer or an aerogel felt layer; the protective layer is preferably a fireproof cloth layer or a metal foil layer, has good heat preservation effect, is suitable for being used in cold areas and meets the strength requirement of the battery box, but does not specifically disclose the physical property and the flame retardant property of the heat preservation layer, and the existing market price of the material in the battery cladding level structure is too high, so that the material is temporarily difficult to commercialize.
Chinese patent CN 109585734A discloses a new energy power battery box and a spraying process, wherein an insulation layer is arranged on the inner and outer parts of the shell in a spraying process mode, which is not affected by the external structural shape of the shell, and has good insulation effect and is integrally formed; however, when the heat insulation layer is arranged in the shell, the instability of the polyurethane foam spraying process easily causes uneven size and uneven appearance of the heat insulation layer, and the assembly of the later-stage battery module is affected.
SOC (State of charge), i.e. the state of charge, is used to reflect the remaining capacity of the battery, and is defined numerically as the ratio of the remaining capacity to the battery capacity, commonly expressed as a percentage; the value range is 0-1, and the battery is completely discharged when soc=0 and completely full when soc=1. The battery SOC cannot be directly measured and can only be estimated by parameters such as battery terminal voltage, charge-discharge current and internal resistance, and the parameters are also influenced by various uncertain factors such as battery aging, environmental temperature change, automobile running state and the like, so accurate SOC estimation becomes a problem to be solved in the development of electric automobiles.
The BMS system is a battery management system, intelligently manages and maintains each battery unit, prevents overcharge and overdischarge of the battery, prolongs the service life of the battery, monitors the state of the battery, and can be used for electric automobiles, battery cars, robots, unmanned aerial vehicles and the like.
The WLTC working condition is a global light automobile test cycle working condition, no periodic acceleration or deceleration exists in the working condition, and the situation that the road surface speeds of different congestion degrees are faster and slower is better reflected; the working condition change is not periodic, so that the difficulty of 'playing with eyes' of a vehicle enterprise when the engine is calibrated is increased; compared with a NEDC test system, the WLTC has longer test period and higher average speed, is closer to the actual running condition of the vehicle, and has more strict test on the comprehensive performance of the vehicle in a wider speed interval, so that the WLTC becomes one of the standards of the endurance mileage test of the new energy electric vehicle.
Disclosure of Invention
The utility model aims to solve the technical problems that a battery pack box body in the prior art is poor in heat preservation effect and fireproof performance, and the appearance of a polyurethane foam spraying layer is uneven, the size is uneven and the assembly of a battery module is affected.
In order to solve the technical problems, the utility model adopts the following technical scheme: the fireproof heat-insulating battery pack box comprises an upper cover 7, a lower shell 1 and a fireproof heat-insulating layer 9 at least arranged on the bottom wall of the inner side of the lower shell 1, wherein a cavity for accommodating a battery module 8 is formed between the upper cover 7 and the lower shell 1, and the fireproof heat-insulating layer 9 sequentially comprises a bonding layer 2, a first polyurea composite layer 3, a polyurethane foam layer 4 and a second polyurea composite layer 5 from outside to inside; the first polyurea composite layer 3 and the second polyurea composite layer 5 are polyurea composite layers containing aerogel particles; the adhesive layer 2 is adhered to the inner wall of the lower case 1 or the upper cover 7.
In the above technical solution, preferably, a side polyurea composite layer 6 is disposed on a side of the polyurethane foam layer 4, and the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 together form an outer wrapping layer of the polyurethane foam layer 4.
In the above technical solution, preferably, the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 are wrapped on the outer side of the polyurethane foam layer 4 in a spraying manner.
In the above technical scheme, preferably, the density of the polyurethane foam layer 4 is 60-150 kg/m 3 Compressive strength > 300Kpa, fire rating V 0 Coefficient of thermal conductivity<0.03W/m·k@25℃。
In the above technical solution, the thickness of the polyurethane foam layer 4 is preferably 5-8 mm.
In the above technical scheme, preferably, the density of the polyurethane foam layer 4 is 80-130 g/cm 3 。
In the above technical solution, preferably, the aerogel particles in the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 account for 5 to 15% of the mass of the polyurea.
In the above technical solution, preferably, the aerogel particles in the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 account for 10 to 15% of the mass of the polyurea.
In the above technical solution, the thickness of the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 is preferably 1-3 mm.
In the above technical solution, preferably, the aerogel particles are at least one selected from silica aerogel, alumina aerogel, fullerene aerogel and carbon aerogel.
In the above technical solution, preferably, the polyurea is at least one selected from an aromatic polyurea, an aliphatic polyurea, or a polyaspartic acid ester polyurea.
In the above technical solution, preferably, the adhesive layer 2 is at least one of a glue layer or a double-sided adhesive layer.
In the above technical solution, preferably, the adhesive layer 2 is a double-sided polyester adhesive layer.
In the above technical solution, preferably, the adhesive layer 2 is a 3M double sided tape 9473, and the peel strength of the adhesive layer 2 is greater than 1.6N/mm.
In the above technical solution, preferably, the inner side wall of the upper cover 7 is also provided with a fireproof insulation layer 9.
In the above aspect, preferably, the lower housing 1 is at least one of an aluminum housing, a steel housing or a composite metal housing.
According to the fireproof heat-insulating battery pack box body provided by the utility model, aerogel particles are added into the polyurea, so that the defect of poor heat insulation of an independent polyurea layer is overcome on the basis of keeping excellent fireproof performance of the polyurea, the polyurethane foam layer is matched with the polyurea composite layer added with the aerogel particles in a synergistic manner, the fireproof grade and heat-insulating performance of the fireproof heat-insulating layer are improved, and the temperature drop time in a heat-insulating effect simulation experiment is prolonged more; the polyurea composite layer is wrapped on the outer side of the polyurethane foam layer, so that the appearance flatness and the size uniformity of the fireproof heat-insulating layer are improved, the assembly of the battery module is facilitated, water vapor can be prevented from entering the inside of the polyurethane foam layer, the waterproof performance is achieved, and meanwhile, the bonding between the bonding layer and the lower shell or the upper cover is firmer; the prepared fireproof heat-preserving battery pack box body has the advantages of fireproof performance, heat preservation, water resistance, good flatness of the inner surface appearance of the box body and firm bonding, and good technical effect is achieved.
The method for detecting the performance of the utility model comprises the following steps:
density: GB/T6343-2009;
compressive strength: GB/T8813-2020;
thermal conductivity coefficient: GB/T10294-2008;
fire rating: UL-94;
peel strength: GB/T2792-2014;
temperature drop time: the aluminum box simulation experiment comprises the following specific processes: the method comprises the steps of manufacturing a lower shell and an upper cover of two aluminum box simulation battery packs, wherein one lower shell and the upper cover are free of fireproof heat preservation layers, the other lower shell and the upper cover are provided with fireproof heat preservation layers according to the technical scheme of the utility model, a reference battery cell module is placed in the aluminum box, and temperature sensors are respectively arranged in the middle, the secondary outer layer and the outer layer of the inside of the aluminum box. The two aluminum boxes are placed in a constant temperature environment at 25 ℃ and then placed in a constant temperature environment at-20 ℃ at the same time, and the time required for each point temperature in the aluminum boxes to drop from 25 ℃ to 0 ℃ is recorded and is recorded as the temperature drop time.
And (3) endurance mileage test: the specific process is that two same automobile battery packs are selected, one automobile battery pack is free of a fireproof heat-insulating layer, and the other automobile battery pack is provided with the fireproof heat-insulating layer according to the technical scheme of the utility model; placing the battery pack on a test battery rack, adopting WLTC standard circulation working conditions, synchronously simulating electric load, ambient temperature and water cooling circulation temperature on the battery rack by the battery pack, completing the test in a climate chamber, setting the temperature of the climate chamber to be minus 20 ℃, and recording battery rack data and battery communication data in the test process; in the test process, the input parameters are current, voltage, inlet and outlet temperatures and flow of the European simulated battery model parameters, and the output parameters are battery charge state SOC and battery temperature of the BMS system; and determining the moment when the full charge battery starts to discharge as the moment when the WLTC cycle starts, recording the T seconds of the WLTC cycle when the SOC is 5%, and calculating the driving distance of the WLTC cycle T seconds through a simulated driving system to obtain the endurance mileage H of the battery pack test.
Drawings
Fig. 1 is a schematic cross-sectional view of a fire-resistant and heat-insulating battery pack case including a battery module.
In fig. 1, 1 is a lower shell, 7 is an upper cover, 8 is a battery module, and 9 is a fireproof heat-insulating layer.
Fig. 2 is a schematic cross-sectional view of a fire protection and insulation layer 9.
In fig. 2, 2 is a bonding layer, 3 is a first polyurea composite layer, 4 is a polyurethane foam layer, 5 is a second polyurea composite layer, and 6 is a side polyurea composite layer.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown.
[ example 1 ]
The battery pack box body comprises an upper cover 7 and a lower shell 1, wherein a cavity for accommodating a battery module 8 is formed between the upper cover 7 and the lower shell 1, a fireproof heat-insulating layer 9 is arranged on the inner bottom wall and the periphery of the inner side of the lower shell 1, and the fireproof heat-insulating layer 9 sequentially comprises a bonding layer 2, a first polyurea composite layer 3, a polyurethane foam layer 4, a second polyurea composite layer 5 and a side polyurea composite layer 6 from outside to inside; the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 are wrapped on the outer side of the polyurethane foam layer 4 in a spraying manner;
the thickness of the side polyurea composite layer 6, the thickness of the first polyurea composite layer 3 and the thickness of the second polyurea composite layer 5 are all 3mm, the polyurea composite layers all contain silica aerogel particles and aromatic polyurea, and the aerogel particles account for 10% of the mass of the polyurea; the density of the polyurethane foam layer 4 is 101g/cm 3 Compressive strength 1025Kpa, fire rating UL94-V 0 The heat conductivity coefficient is 0.02518W/m.k@25deg.C, and the thickness is 7mm; the bonding layer 2 is 3M double faced adhesive tape 9473, the thickness is 0.25mm, and the density is 0.98g/cm 3 Peel strength 1.7N/mm; the lower shell 1 is an aluminum shell, the concrete material is 3003 aluminum alloy, and the density is 2.72g/cm 3 。
[ example 2 ]
The battery pack box body comprises an upper cover 7 and a lower shell 1, wherein a cavity for accommodating a battery module 8 is formed between the upper cover 7 and the lower shell 1, the inner bottom wall and the inner periphery of the lower shell 1 and the inner wall of the upper cover 7 are respectively provided with a fireproof heat-insulating layer 9, and the fireproof heat-insulating layers 9 sequentially comprise a bonding layer 2, a first polyurea composite layer 3, a polyurethane foam layer 4, a second polyurea composite layer 5 and a side polyurea composite layer 6 from outside to inside; the side polyurea composite layer 6, the first polyurea composite layer 3 and the second polyurea composite layer 5 are wrapped on the outer side of the polyurethane foam layer 4 in a spraying manner;
the thickness of the side polyurea composite layer 6, the thickness of the first polyurea composite layer 3 and the thickness of the second polyurea composite layer 5 are all 3mm, the polyurea composite layers all contain silica aerogel particles and aromatic polyurea, and the aerogel particles account for 15% of the mass of the polyurea; the density of the polyurethane foam layer 4 is 85g/cm 3 Compressive strength 857Kpa, fire rating UL94-V 0 The heat conductivity coefficient is 0.02446W/mk@25 ℃, and the thickness is 7mm; the bonding layer 2 is 3M double faced adhesive tape 9473, the thickness is 0.25mm, and the density is 0.98g/cm 3 Peel strength 1.7N/mm; the lower shell 1 is an aluminum shell, the concrete material is 3003 aluminum alloy, and the density is 2.72g/cm 3 。
[ comparative example 1 ]
The battery pack box body comprises an upper cover 7 and a lower shell 1, wherein a cavity for accommodating a battery module 8 is formed between the upper cover 7 and the lower shell 1, a fireproof heat preservation layer is not arranged on the battery pack box body, and the results of a heat preservation effect simulation experiment and a endurance mileage experiment are shown in tables 1 and 2.
[ example 3 ]
The heat preservation effect simulation experiment of the fireproof heat preservation battery pack box body comprises the following specific processes:
(a) Preparing 3 aluminum boxes with the dimensions of 24cm multiplied by 12cm to replace a lower shell and an upper cover of a battery pack box body, wherein the aluminum boxes are respectively marked as No. 1, no. 2 and No. 3, reference cell materials are placed in the aluminum boxes, and temperature sensors are respectively arranged at the central position, the secondary outer position and the outer position in the aluminum boxes;
(b) The No. 1 aluminum box is not subjected to box heat preservation treatment according to the scheme of the comparative example 1; carrying out heat preservation treatment on the inner walls of the No. 2 aluminum box and the No. 3 aluminum box according to the technical schemes of the embodiments 1 and 2 respectively;
(c) The non-heat-insulating 1# aluminum box, the heat-insulating 2# aluminum box and the heat-insulating 3# aluminum box are simultaneously placed in a 25 ℃ environment for constant temperature treatment, then are simultaneously placed in a-20 ℃ constant temperature environment, and the time required for the temperature of different positions in the aluminum box to drop from 25 ℃ to 0 ℃ is recorded and recorded as the temperature drop time, and the specific results are shown in table 1.
Table 1 results data of simulation experiments on aluminum boxes
| Performance index | Aluminum box 1# | Aluminum box 2# | Aluminum box 3 #) |
| Polyurethane foam layer thickness (mm) | / | 7 | 7 |
| Polyurethane foam Density (kg/m) 3 ) | / | 101 | 85 |
| Polyurea composite layer thickness (mm) | / | 3 | 3 |
| Outside-temperature drop time (h) | 1.46 | 2.96 | 4.03 |
| Minor lateral-temperature drop time (h) | 2.74 | 4.36 | 5.53 |
| Center-temperature drop time (h) | 3.02 | 4.91 | 6.17 |
[ example 4 ]
The endurance mileage test experiment of the fireproof heat-preserving battery pack box body comprises the following specific processes:
(a) 3 commercial power Chi Baoxiang bodies of the same type are prepared, which are respectively marked as No. 1, no. 2 and No. 3, the same type battery modules are placed in the bodies,
inputting current, voltage, inlet and outlet temperatures of a water cooling system and flow parameters obtained by European battery pack simulation, wherein the output parameters are battery state of charge (SOC) and battery temperature of a BMS system; adopting WLTC standard circulation working condition, realizing synchronous simulation of electric load, environment temperature and water cooling circulation temperature on a battery rack by a battery pack, completing test in a climate chamber, wherein the temperature of the climate chamber is-20 ℃, and recording rack data and battery communication data in the test process;
(b) The 1# battery pack case is not subjected to heat preservation treatment according to the scheme of comparative example 1; the inner walls of the lower shell or the upper cover of the 2# battery pack box body and the 3# battery pack box body are subjected to heat preservation treatment according to the technical schemes of the embodiments 1 and 2 respectively;
(c) And (3) placing the battery pack box body 1 which is not subjected to heat preservation treatment and the battery pack box bodies 2# and 3# which are subjected to heat preservation treatment into an environmental climate chamber at the temperature of minus 20 ℃ at the same time, determining the moment of starting discharging of the battery as WLTC (wafer level brake) circulation starting moment under the state of full charge of the battery, recording the WLTC circulation time T when the SOC is 5%, and calculating the driving distance of the WLTC circulation T seconds through a simulated driving system, wherein the driving distance is the endurance mileage H of the battery pack test, and the specific result is shown in a table 2.
Table 2 endurance mileage outcome data
| Performance index | Battery pack case 1# | Battery pack case 2# | Battery pack case 3# |
| Polyurethane foam layer thickness (mm) | / | 7 | 7 |
| Polyurethane foam Density (kg/m) 3 ) | / | 101 | 85 |
| Polyurea composite layer thickness (mm) | / | 3 | 3 |
| Cruising mileage H (Km) | 346 | 387 | 441 |
As can be seen from table 1 and table 2, the fireproof heat-preserving battery pack box body provided by the utility model can well prolong the battery pack temperature drop time under the low temperature condition, and has good heat-preserving performance; the continuous voyage mileage when the SOC is 5% can be increased by 95km, and the continuous voyage mileage of the battery is ensured.
According to the fireproof heat-insulating battery pack box body provided by the utility model, the aerogel particles are added into the polyurea, so that the defect of poor heat insulation of an independent polyurea layer is overcome, the polyurea composite layer is wrapped on the outer side of the polyurethane foam layer, so that the appearance flatness and the uniform size of the fireproof heat-insulating layer are improved, the battery module is convenient to assemble, water vapor can be prevented from entering the polyurethane foam layer, the waterproof performance is realized, and meanwhile, the bonding between the bonding layer and the lower shell or the upper cover is firmer; the prepared fireproof heat-insulating battery pack box body has the advantages of fireproof performance, heat insulation, water resistance, smooth appearance and firmer bonding, achieves good technical effects, and can be used in industrial application of new energy automobile battery packs.
Claims (7)
1. The utility model provides a battery package box of fire prevention heat preservation, includes upper cover (7), lower casing (1) and locates fire prevention heat preservation (9) of the inboard diapire of lower casing (1) at least, forms the cavity that holds battery module (8) between upper cover (7) and lower casing (1), and characterized in that, fire prevention heat preservation (9) are from outside to inside including tie coat (2), first polyurea composite layer (3), polyurethane foam layer (4) and second polyurea composite layer (5) in proper order; wherein the first polyurea composite layer (3) and the second polyurea composite layer (5) are polyurea composite layers containing aerogel particles; the bonding layer (2) is bonded with the inner wall of the lower shell (1) or the upper cover (7).
2. The fireproof and heat-insulating battery pack case according to claim 1, wherein the side surface of the polyurethane foam layer (4) is provided with a side surface polyurea composite layer (6), and the side surface polyurea composite layer (6), the first polyurea composite layer (3) and the second polyurea composite layer (5) together form an outer wrapping layer of the polyurethane foam layer (4); the density of the polyurethane foam layer (4) is 60-150 kg/m 3 Compressive strength > 300Kpa, fire rating V 0 Coefficient of thermal conductivity<0.03W/m.k@25 ℃, and the thickness is 5-8 mm.
3. The fireproof and heat-insulating battery pack case according to claim 2, wherein the thickness of the side polyurea composite layer (6), the first polyurea composite layer (3) and the second polyurea composite layer (5) is 1-3 mm.
4. The fire-proof and heat-insulating battery pack case according to claim 1, wherein the adhesive layer (2) is at least one selected from a glue layer and a double-sided adhesive layer.
5. The fire-proof and heat-insulating battery pack case according to claim 4, wherein the adhesive layer (2) is a double-sided polyester adhesive layer.
6. The fireproof and heat-insulating battery pack case according to claim 1, wherein the inner side wall of the upper cover (7) is also provided with a fireproof and heat-insulating layer (9).
7. The fire-resistant and heat-insulating battery pack case according to any one of claims 1 to 6, wherein the lower case (1) is at least one selected from an aluminum case, a steel case, and a composite metal case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321170254.9U CN220121976U (en) | 2023-05-16 | 2023-05-16 | Fireproof heat-preserving battery pack box |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321170254.9U CN220121976U (en) | 2023-05-16 | 2023-05-16 | Fireproof heat-preserving battery pack box |
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| CN220121976U true CN220121976U (en) | 2023-12-01 |
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| CN202321170254.9U Active CN220121976U (en) | 2023-05-16 | 2023-05-16 | Fireproof heat-preserving battery pack box |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118102629A (en) * | 2023-12-29 | 2024-05-28 | 荣耀终端有限公司 | An electronic device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118102629A (en) * | 2023-12-29 | 2024-05-28 | 荣耀终端有限公司 | An electronic device |
| CN118102629B (en) * | 2023-12-29 | 2024-12-20 | 荣耀终端有限公司 | An electronic device |
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