CN115443574A

CN115443574A - Battery cooling liquid and battery packaging structure

Info

Publication number: CN115443574A
Application number: CN202080100155.6A
Authority: CN
Inventors: 王永珍; 李丽娜; 刘晓熹; 吴昊
Original assignee: Dongguan Nvt Technology Co Ltd
Current assignee: Dongguan Nvt Technology Co Ltd
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2022-12-06
Also published as: WO2021212512A1

Abstract

A battery cooling liquid (10) comprises at least one of fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone, and a perfluorocarbon compound, and the battery cooling liquid (10) is an insulating cooling liquid. A battery packaging structure (100) using the battery coolant (10) is also provided. The battery coolant (10) has high reliability and contributes to improvement of heat dissipation efficiency.

Description

Battery cooling liquid and battery packaging structure

Technical Field

The application relates to the field of batteries, in particular to a battery cooling liquid and a battery packaging structure applying the same.

Background

At present, the heat management modes of the battery system are mainly divided into natural cooling, air cooling technology, liquid cooling technology and the like. Wherein, the liquid cooling technique is considered as the best radiating mode of effect, but current liquid cooling radiating mode adopts the mode of liquid filling's liquid cooling board contact heating sources such as battery, BMS control panel, the heating source makes practical application comparatively difficult with liquid cooling board effective contact, and in addition, the not enough in aspects such as the fixing of liquid cooling board, leakproofness, insulating nature all make current liquid cooling's mode have obvious defect.

Disclosure of Invention

In view of the above, it is necessary to provide a battery coolant having high reliability and contributing to improvement of heat dissipation efficiency, and a battery package structure using the same.

The battery cooling liquid comprises at least one of fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone and perfluorocarbon compounds, and is an insulating cooling liquid.

In one embodiment of the present invention, the number of carbon atoms in the fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone, or perfluorocarbon compound is 2 to 9.

As an embodiment of the present application, the fluorinated ether includes at least one of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, hexafluoropropyl methyl ether, 1-methoxy-7-fluoropropane (or heptafluoropropyl methyl ether), nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, 1,1,1,2,3,4,4,5,5,5-decafluoro-2-trifluoromethylpentane-3-methyl ether, methylnonafluorobutyl ether, pentadecafluoroheptyl ethyl ether, trifluoromethyl ether, perfluoromethyl ethyl ether, trifluoroethyl hexafluoropropyl ether, nonafluorotetrahydropyran, perfluorocyclic ether.

As one embodiment of the present application, the hydrofluorocarbon is at least one of decafluoropentane and pentafluorobutane.

As one embodiment of the present application, the hydrofluoroamine is at least one of 1-

butylamine

1,1,2,2,3,3,4,4-nonafluoro-N, N-bis (nonafluorobutyl), perfluorotributylamine, perfluorotripentylamine, and perfluorotripropylamine.

As an embodiment of the present application, the perfluoroketone is at least one of perfluorobutanone, perfluoropentanone, perfluorohexanone, and perfluorobutanone.

As an embodiment of the present application, the perfluoro compound is at least one of hexafluoropropylene trimer, hexafluoropropylene dimer, perfluoroheptane, perfluorooctane, and perfluorohexane.

As one aspect of the present application, the battery coolant further includes an additive, where the additive is at least one selected from the group consisting of flame-retardant natural mineral oil, silicone oil, alcohols, alkanes, and derivatives thereof.

As one scheme of the application, the mass percentage of the additive in the battery cooling liquid is less than or equal to 30%.

As one scheme of the application, the additive comprises flame-retardant natural mineral oil and at least one of alcohol and organic silicone oil, wherein the mass percent of the flame-retardant natural mineral oil in the additive is less than or equal to 40%.

The battery packaging structure comprises the battery cooling liquid.

According to the battery packaging structure, the battery cooling liquid comprises at least one of fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone and perfluorinated hydrocarbon compounds, the battery cooling liquid is electrically insulated, the reliability of the battery packaging structure using the battery cooling liquid is higher, and when the battery cooling liquid is directly contacted with an electronic element, the heat dissipation efficiency of the battery packaging structure can be effectively improved.

Drawings

Fig. 1 is a schematic structural diagram of a battery package structure according to an embodiment of the present disclosure.

Fig. 2 is a schematic cross-sectional view of a battery package structure according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a battery package structure according to an embodiment of the present application.

Fig. 4 is a disassembled schematic view of a battery packaging structure according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a battery package structure according to an embodiment of the present application.

Fig. 6 is a disassembled schematic view of a battery packaging structure according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a battery package structure according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of a battery package structure according to an embodiment of the present disclosure.

Fig. 9 is a disassembled schematic view of a battery packaging structure according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a battery package structure according to an embodiment of the present application.

FIG. 11 is a graph showing the temperature rise of example 1 and comparative example 1 in the present application.

FIG. 12 is a temperature rise graph of example 2 and comparative example 1 in the present application.

FIG. 13 is a graph showing the temperature rise of example 3 and comparative example 2 in the present application.

FIG. 14 is a temperature rise graph of example 4 and comparative example 2 in the present application.

Description of the main elements

Battery packaging structure	100
Battery cooling liquid	10
Shell body	30
Battery with a battery cell	50
Containing cavity	301
Inner wall	301a
Battery body
	51
Protective plate	53
Liquid injection hole	303
Sealing element	305
Upper shell	31
Lower casing	33
Opening of the container	307、308、309
Golden finger	530
Flexible circuit board	60

Electronic wire	56
Heat radiation structure	70

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The features of the following examples/embodiments and examples/embodiments may be combined with each other without conflict.

Referring to fig. 1 and 2, a battery package structure 100 according to an embodiment of the present disclosure includes a battery coolant 10 in the battery package structure 100. The battery coolant 10 is an insulating material.

In some embodiments, the battery coolant has a resistivity greater than 10 ⁶ Ohm. Preferably, the battery coolant has a resistivity greater than 10 ¹² Ohm. The phase transition temperature of the battery coolant may be 38 ℃ to 112 ℃.

In some embodiments, the battery coolant 10 including at least one of fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone, and perfluorohydrocarbon compound is insulated from the battery coolant 10, so that the battery coolant 10 has high reliability and the heat dissipation effect of the battery coolant is good. In some embodiments, the number of the carbon atoms in the fluorinated ether, the hydrofluorocarbon, the hydrofluoroamine, the perfluoroketone, or the perfluorocarbon compound may be, but is not limited to, 2 to 9, and when the number of the carbon atoms exceeds 9, the correspondingly formed battery coolant may have an excessively high viscosity or even a solid state in the battery temperature rise section, so that effective heat dissipation cannot be achieved in the battery temperature rise section, and the heat dissipation effect is poor.

In some embodiments of the present invention, the substrate is, the fluorinated ether may be, but is not limited to, 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether, 1,1,2,2-tetrafluoroethyl-2,2,2-trifluoroethyl ether, hexafluoropropyl methyl ether, 1-methoxy-7-fluoropropane (or heptafluoropropyl methyl ether), nonafluorobutyl methyl ether, nonafluorobutyl ethyl ether, 1,2,3,4, 5-decafluoro-2-trifluoromethylpentane-3-methyl ether, methylnonafluorobutyl ether, pentadecafluoroheptyl ethyl ether, trifluoromethyl ether, perfluoromethylethyl ether, trifluoroethyl hexafluoropropyl ether, nonafluorotetrahydropyran, perfluorocyclic ether.

In some embodiments, the hydrofluorocarbon may be at least one of decafluoropentane and pentafluorobutane.

In some embodiments, the hydrofluoroamine may be at least one of 1-

butylamine

1,2,3, 4-nonafluoro-N, N-bis (nonafluorobutyl), perfluorotributylamine, perfluorotripentylamine, perfluorotripropylamine.

In some embodiments, the perfluoroketone is at least one of perfluorobutanone, perfluoropentanone, perfluorohexanone, perfluorobutanone. Preferably, the perfluoroketone is perfluorohexanone.

In some embodiments, the perfluorocarbon compound may be at least one of hexafluoropropylene trimer, hexafluoropropylene dimer, perfluoroheptane, perfluorooctane, perfluorohexane.

In some embodiments, the battery coolant 10 may further include an additive. The additive can be, but is not limited to, at least one of flame-retardant natural mineral oil, organic silicone oil, alcohols, alkanes and derivatives thereof. Preferably, the alcohol is ethylene glycol.

When the battery cooling liquid 10 includes the additive, the mass percentage of the additive in the battery cooling liquid is less than or equal to 30%, and if the content of the additive exceeds 30%, the cooling liquid is prone to phase separation after being heated due to the fact that the polarity of the additive is greatly different from that of the battery cooling liquid. The materials can not be uniformly mixed in the heat production process of the next charge-discharge cycle, so that the refrigeration effect of the battery cooling liquid is unstable.

In some embodiments, the additive comprises a flame-retardant natural mineral oil and at least one of an alcohol and a silicone oil. At the moment, the mass percentage of the flame-retardant natural mineral oil in the additive is less than or equal to 40%, and the proportion of the flame-retardant natural mineral oil exceeding 40% not only leads to the unstable refrigeration effect of the battery refrigerating fluid, but also leads to the difficulty of the battery refrigerating fluid entering the electronic components of the battery protection board due to the large viscosity and high surface energy, so that the heat dissipation effect is reduced.

Referring to fig. 1 and 2, the battery package structure 100 further includes a housing 30 and a battery 50. The housing 30 includes a receiving chamber 301. The battery 50 is at least partially enclosed in the accommodating cavity 301. The battery coolant 10 is contained in the containing cavity 301. The part of the battery 50, which is packaged in the containing cavity 301, is immersed in the battery cooling liquid 10, and the battery cooling liquid 10 is directly contacted with the part of the battery 50, which is packaged in the containing cavity 301, so that the part of the battery 50, which is packaged in the containing cavity 301, is favorably and fully infiltrated, thereby improving the heat dissipation efficiency and the heat dissipation uniformity when the battery 50 is used, and reducing the temperature rise rate and the amplitude of the part of the battery 50, which is packaged in the containing cavity 301.

The battery 50 may be a square battery, or may be other regularly-shaped batteries or specially-shaped batteries. In the present application, a square battery is explained as an example.

In some embodiments, it is preferable that a ratio of a volume of the accommodating chamber 301 to a volume of a portion of the battery 50 enclosed in the accommodating chamber 301 is greater than 1 and less than 1.8.

When the battery packaging structure 100 dissipates heat of the portion of the battery 50 packaged in the accommodating cavity 301 through a single-phase cooling manner, preferably, a ratio of a volume of the accommodating cavity 301 to a volume of the portion of the battery 50 packaged in the accommodating cavity 301 is greater than 1 and less than 1.2.

When the battery packaging structure 100 dissipates heat from the portion of the battery 50 packaged in the accommodating cavity 301 in a manner of phase change of the battery cooling liquid 10, that is, when the phase change temperature of the battery cooling liquid 10 is lower than the heat generation temperature of the portion of the battery 50 packaged in the accommodating cavity 301, preferably, the ratio of the volume of the accommodating cavity 301 to the volume of the portion of the battery 50 packaged in the accommodating cavity 301 is greater than 1.3 and smaller than 1.8.

Preferably, the part of the battery 50 enclosed in the accommodating cavity 301 is not in contact with the housing 30, so that the battery cooling liquid 10 is in full contact with the part of the battery 50 enclosed in the accommodating cavity 301, and meanwhile, the accommodating cavity 301 is ensured to have enough battery cooling liquid 10, and in addition, the risk that the part of the battery 50 enclosed in the accommodating cavity 301 damages the housing 30 when the battery enclosing structure 100 is subjected to an external force can be reduced. More preferably, the space between the part of the battery 50 enclosed in the accommodating cavity 301 and the inner wall 301a of the housing 30 is 0.2mm to 20mm.

The battery 50 further includes a battery body 51 and a protection plate 53 provided at one end of the battery body 51. In some embodiments, as shown in fig. 1, the battery body 51 is composed of a single battery cell. In some embodiments, as shown in fig. 4, the battery body 51 may also be formed by connecting a plurality of battery cells in series and/or in parallel.

In some embodiments, referring to fig. 2, the housing 30 is combined with one end of the battery body 51 provided with the protection plate 53 to form the accommodating cavity 301, and the protection plate 53 is accommodated in the accommodating cavity 301 and directly immersed in the battery coolant 10, so as to dissipate heat of the protection plate 53 through the battery coolant 10 when the battery 50 is used subsequently. Namely, the part of the battery 50 enclosed in the accommodating cavity 301 is the protective plate 53.

The housing 30 may be made of a heat conductive material such as a metal material or a plastic material. Preferably, the housing 30 is made of a heat conductive material having a heat conductivity of 0.2W/mK to 5W/mK. Preferably, the thickness of the case 30 may be 0.08mm to 2mm.

The metal material may be, but is not limited to, at least one of aluminum material, copper material, stainless steel, aluminum alloy, carbon steel, and the like. The plastic material may be, but is not limited to, at least one of polyacrylic resin (PMMA), polycarbonate (PC), hydrogenated styrene-butadiene block copolymer (SEBS), thermoplastic elastomer (TPE), and the like.

The case 30 is adhesively bonded to the battery body 51 and seals the connection with the battery body 51.

The housing 30 may further include a liquid injection hole 303 and a sealing member 305, the liquid injection hole 303 communicates the accommodating chamber 301 with the outside, and the battery coolant 10 is injected into the accommodating chamber 301 through the liquid injection hole 303. The sealing member 305 seals the liquid injection hole 303 in cooperation with the liquid injection hole 303, so as to prevent the battery coolant 10 from leaking from the liquid injection hole 303. The sealing member 305 can be but not limited to a rubber plug, the rubber plug with but interference fit, meshing or bond through the adhesive between the liquid injection hole 303, only need guarantee the rubber plug with it can to inject sealed between the hole 303.

As shown in fig. 1, the housing 30 may be a unitary structure. In some embodiments, the housing 30 may include a plurality of detachable portions, and as shown in fig. 3 and 4, the housing 30 may include an upper housing 31 and a lower housing 33. The upper casing 31 and the lower casing 33 are respectively combined with the battery body 51, and one end of the upper casing 31, one end of the lower casing 33 and one end of the battery body 51 are mutually matched and sealed to form the accommodating cavity 301.

When the housing 30 is made of a metal material, an electrical insulation process may be performed on the inner wall of the receiving cavity 301, for example, an electrical insulation material is plated on the inner wall of the receiving cavity 301 to form an insulation film (not shown), so as to avoid a short circuit or a safety hazard caused by the component (such as the protection plate 53) received in the receiving cavity 301 contacting the housing 30 under the action of pressing or other external forces. Wherein the electrically insulating material may be a polar thermosetting resin or an electrically insulating carbon material. Preferably, the carbon material may be selected from a diamond-like carbon film (DLC film) doped with at least one of aluminum hydroxide, silicon oxide, aluminum oxide, silicon carbide, silicon nitride, and the like, or a non-doped DLC film. The carbon material may form an insulating film on the inner wall of the accommodating chamber 301 by vacuum plating.

When the housing 30 is made of plastic material, the housing 30 can be integrally formed on the battery body 51 by injection molding.

In some embodiments, as shown in fig. 1 and 2, the protection plate 53 may be provided with a gold finger 530. An opening 307 is formed on the housing 30 to expose the gold finger 530, so that the battery 50 is electrically connected to other electronic components through the gold finger 530; and the gold finger 530 is sealed with the side wall of the housing 30 forming the opening 307 to prevent the battery coolant 10 from leaking from the opening 307.

In some embodiments, as shown in fig. 3 and 4, the battery 50 may be electrically connected to other electronic components through a flexible circuit board 60. Specifically, an opening 308 is formed in the housing 30, one end of the flexible circuit board 60 is enclosed in the accommodating cavity 301 and connected to the protection board 53, and the other end of the flexible circuit board extends out of the housing 30 from the opening 308 so as to be electrically connected to other electronic components. Wherein the flexible circuit board 60 is sealed from the side of the opening 308 to prevent the battery coolant 10 from leaking from the opening 308.

In some embodiments, referring to fig. 5 and 6, the battery package structure 100 may further include an electronic wire 56 for electrically connecting with other electronic components. An opening 309 is formed in the housing 30, one end of the electronic wire 56 is packaged in the accommodating cavity 301 and connected to the protection plate 53, and the other end of the electronic wire 56 extends out of the housing 30 from the opening 309 so as to be connected to other electronic components. Wherein the electron beam 56 is sealed from the side of the opening 309 to prevent the battery coolant 10 from leaking from the opening 309.

In some embodiments, referring to fig. 7, the battery 50 may also be entirely packaged in the accommodating cavity 301, and the entire battery 50 is immersed in the battery cooling liquid 10, so as to further improve the heat dissipation efficiency and the uniformity of heat dissipation when the battery 50 is used. Namely, the battery body 51 and the protective plate 53 are both enclosed in the accommodating cavity 301 and immersed in the battery coolant 10.

In some embodiments, only the battery body 51 may be located in the accommodating cavity 301 and immersed in the battery coolant 10, and the protective plate 53 may be located outside the housing 30.

In some embodiments, the housing 30 may also be made of a heat shrinkable film, such as a multi-layer co-extruded heat shrinkable film formed of at least one of Polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), bidirectional polypropylene (OPP), polyvinylidene chloride (PVDC), ethylene Vinyl Acetate (EVA), multi-layer co-extruded polyolefin heat shrinkable film (POF), acrylonitrile Butadiene Styrene (ABS), and the like. As shown in fig. 7, the heat shrink film may cover the entire battery 50.

In some embodiments, the housing 30 and the battery 50 may be provided independently of each other. For example, as shown in fig. 8 and 9, the housing 30 includes an upper housing 31 and a lower housing 33. The upper housing 31 and the lower housing 33 are respectively independent from the battery 50, and the upper housing 31 and the lower housing 33 are matched and sealed to form the accommodating cavity 301. As shown in fig. 9, the upper housing 31 and the lower housing 33 may be respectively provided with a groove 300, and the upper housing 31 and the lower housing 33 are connected and can be folded along the connection so that the two grooves 300 cooperate to form an accommodating cavity 301.

In some embodiments, referring to fig. 10, the battery package structure 100 may further include other heat dissipation structures 70, and the heat dissipation structure 70 may be a liquid cooling plate, a high thermal conductivity material (e.g., graphene, graphite sheet), or a heat dissipation coating. The heat dissipation structure 70 is disposed on the outer surface of the housing 30 to further accelerate the heat dissipation of the battery 50.

The present application is further illustrated by comparative examples and examples.

And providing a battery, wherein the battery comprises a battery body and a protection plate, the battery body is connected with the protection plate through a tab, and the protection plate is packaged in a containing cavity of a shell made of a polyacrylic resin (PMMA) material, so that the battery packaging structure of the comparative example 1 is prepared.

The battery package structure of example 1 is different from the battery package structure of comparative example 1 in that 3mL of perfluorohexane as a battery coolant is packaged in the housing chamber, and the protective plate is immersed in the perfluorohexane. The batteries of comparative example 1 and example 1 were charged with the same large current, and the temperatures of the tab and the case were detected at the same time point, and the corresponding data records were plotted as a graph of fig. 11. As can be seen from fig. 11, the temperature of the tab in example 1 was reduced by 4 to 7 c during charging as compared to the tab in comparative example 1.

The battery packaging structure of example 2 differs from the battery packaging structure of comparative example 1 in that 2mL of hexafluoropropylene trimer was packaged as the battery coolant in the housing chamber, and the protective plate was immersed in the hexafluoropropylene trimer. The batteries of comparative example 1 and example 2 were charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point, and the corresponding data records were plotted as a graph of fig. 12. As can be seen from fig. 12, the temperature of the MOS transistor of example 2 was reduced by 9 to 10 ℃ during the charging process, compared to the temperature of the MOS transistor of comparative example 1.

The battery packaging structure of comparative example 2 is different from the battery packaging structure of comparative example 1 in that the protective plate is packaged in the accommodating cavity of the Ta-C coated aluminum casing.

The battery encapsulating structure of example 3 differs from the battery encapsulating structure of comparative example 2 in that 1mL of perfluorotributylamine as a battery coolant was encapsulated in the accommodating chamber, and the protective plate was immersed in the perfluorotributylamine. The batteries of comparative example 2 and example 3 were charged with the same large current, respectively, and the temperature of the resistor on the protection panel was detected at the same time point, and the corresponding data records were plotted as a graph in fig. 13. As can be seen from fig. 13, the temperature of the resistor of example 3 was reduced by 7 to 8 c during the charging process compared to the temperature of the resistor of comparative example 2.

The battery package structure of example 4 is different from the battery package structure of comparative example 2 in that 1mL of a mixed solution of hexafluoropropylene trimer (70% by volume) and ethylene glycol (30%) is packaged in the housing chamber as a battery cooling liquid, and the protective plate is immersed in the mixed solution. The batteries of comparative example 2 and example 4 were charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point, and the corresponding data records were plotted as a graph in fig. 14. As can be seen from fig. 14, the temperature of the MOS transistor of example 4 was reduced by 7 to 8 ℃ during the charging process, compared to the temperature of the MOS transistor of comparative example 2.

The battery packaging structure of example 5 differs from that of example 2 in that decafluoropentane was used as the battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 5 was reduced by 8 to 9 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery package structure of example 6 is different from that of example 2 in that hexafluoropropyl methyl ether is used as a battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 6 to 7 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery package structure of example 6 is different from that of example 2 in that perfluorohexanone was used as a battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 9 to 10 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery package structure of example 7 differs from that of example 6 in that a mixed solution of perfluorohexanone (50%) and hexafluoropropyl methyl ether (50%) is used as the battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 11 to 12 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery packaging structure of example 8 differs from that of example 6 in that a mixed solution of perfluorohexanone (50%) and perfluorotributylamine (50%) is used as the battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 12 to 13 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery package structure of example 9 differs from that of example 5 in that a mixed solution of decafluoropentane (50%) and perfluorotributylamine (50%) is used as a battery coolant. The battery of example 5 was charged with the same large current, and the temperature of the MOS transistor on the protection plate was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 8 to 9 ℃ compared to the temperature of the MOS transistor in comparative example 1.

The battery package structure of example 10 is different from that of example 6 in that a mixed solution of perfluoropentanone (50%) and perfluorotripentylamine (50%) is used as the battery coolant. The battery of example 5 was charged with the same large current and the temperature of the MOS transistor on the protection board was detected at the same time point. During charging, the temperature of the MOS transistor in example 6 was reduced by 12 to 13 ℃ compared to the temperature of the MOS transistor in comparative example 1.

As can be seen from the above, compared with the comparative example without the battery coolant, the heat dissipation effect of the battery packaging structure of the embodiment in which the protection plate is directly immersed in the battery coolant is significantly better, and the temperature rise rate in the early stage is significantly lower.

In addition, it is obvious to those skilled in the art that other various corresponding changes and modifications can be made according to the technical idea of the present application, and all such changes and modifications should fall within the scope of the present application.

Claims

The battery cooling liquid is characterized by comprising at least one of fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone and a perfluorinated hydrocarbon compound, and is an insulating cooling liquid.
The battery coolant according to claim 1 wherein the number of carbon atoms in the fluorinated ether, hydrofluorocarbon, hydrofluoroamine, perfluoroketone, or perfluorohydrocarbon compound is 2 to 9.
<xnotran> 1 , , 1,1,2,2- -2,2,3,3- ,1,1,2,2- -2,2,2- , , 1- -7- , , ,1,1,1,2,3,4,4,5,5,5- -2- -3- , , , , , , , . </xnotran>
The battery coolant according to claim 1 wherein said hydrofluorocarbon is at least one of decafluoropentane and pentafluorobutane.
The battery coolant according to claim 1 wherein the hydrofluoroamine is at least one of 1-butylamine 1,2,3, 4-nonafluoro-N, N-bis (nonafluorobutyl), perfluorotributylamine, perfluorotripentylamine, and perfluorotripropylamine.
The battery coolant according to claim 1, wherein the perfluoroketone is at least one of perfluorobutanone, perfluoropentanone, perfluorohexanone, and perfluorobutanone.
The battery coolant according to claim 1 wherein the perfluoro compound is at least one of hexafluoropropylene trimer, hexafluoropropylene dimer, perfluoroheptane perfluorooctane, perfluorohexane.
The battery coolant according to any one of claims 1 to 7, further comprising an additive selected from at least one of flame-retardant natural mineral oils, silicone oils, alcohols, alkanes, and derivatives thereof.
The battery coolant of claim 8 wherein the additive is present in the battery coolant at less than or equal to 30% by mass.
The battery coolant according to claim 9, wherein the additive comprises a flame-retardant natural mineral oil, and the additive further comprises at least one of an alcohol and a silicone oil, wherein the flame-retardant natural mineral oil is present in the additive in an amount of 40% by mass or less.
A battery packaging structure, characterized in that it comprises a battery coolant according to any one of claims 1 to 10.