WO2021212513A1

WO2021212513A1 - Battery encapsulation structure

Info

Publication number: WO2021212513A1
Application number: PCT/CN2020/086833
Authority: WO
Inventors: 李丽娜; 王永珍; 李东伟; 刘晓熹
Original assignee: 东莞新能德科技有限公司
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2021-10-28
Also published as: CN115485909A

Abstract

Disclosed is a battery encapsulation structure. The battery encapsulation structure comprises a housing, a battery and battery cooling liquid. The housing comprises an accommodating cavity; the battery is at least partially encapsulated in the accommodating cavity; and the battery cooling liquid is made of an insulating material, the battery cooling liquid is accommodated in the accommodating cavity, and the part of the battery that is encapsulated in the accommodating cavity is immersed in the battery cooling liquid, such that the heat dissipation efficiency of the battery packaging structure is improved.

Description

Battery packaging structure

Technical field

This application relates to the field of battery heat dissipation, and in particular to a battery packaging structure.

Background technique

At present, the thermal management methods of battery systems are mainly divided into natural cooling, air cooling technology, liquid cooling technology and other methods. Among them, liquid cooling technology is considered to be the most effective heat dissipation method, but the existing liquid cooling heat dissipation method uses a liquid-filled liquid cold plate to contact a battery, BMS control board and other heat sources, and the heat source and the liquid cold plate are effective Contact makes practical application more difficult. In addition, the lack of fixation, sealing, and insulation of the liquid cooling plate makes the existing liquid cooling methods have obvious defects.

Summary of the invention

In view of the foregoing, it is necessary to provide a battery packaging structure that is highly reliable and helps to improve heat dissipation efficiency.

A battery packaging structure of the present application includes:

The housing, including the accommodating cavity;

The battery is at least partially encapsulated in the accommodating cavity; and

A battery cooling liquid, the battery cooling liquid is an insulating material, the battery cooling liquid is contained in the accommodating cavity, and the part of the battery enclosed in the accommodating cavity is immersed in the battery cooling liquid.

As an embodiment of the present application, the resistivity of the cell coolant is greater than 10 ⁶ ohms.

As a solution of the present application, the phase transition temperature of the battery cooling liquid is 38°C to 112°C.

As a solution of the present application, the battery is partially or completely enclosed in the containing cavity of the casing, and the battery is immersed in the battery cooling liquid.

As a solution of the present application, the material of the shell is a thermally conductive material with a thermal conductivity of 0.2 W/m·K to 5 W/m·K.

As a solution of the present application, the shell is a heat shrinkable film.

As a solution of the present application, the battery includes a battery body and a protection plate provided at one end of the battery body, and the protection plate, the battery body, or a combination of the protection plate and the battery body are packaged in the container. In the cavity, the protective plate, the battery body, or the combination of the protective plate and the battery body is immersed in the battery cooling liquid.

As a solution of the present application, the casing is combined with one end of the battery body where the protective plate is provided to form an accommodating cavity to accommodate the protective plate in cooperation with the battery body, and the casing is provided with A liquid injection hole is used to infuse the battery cooling liquid, and the liquid injection hole is sealed by a sealing member.

As a solution of the present application, the housing and the battery are arranged independently, the housing includes an upper housing and a lower housing, and the upper housing and the lower housing cooperate and seal to form the housing The cavity is used for accommodating the protection board, the battery body or the combination of the protection board and the battery body.

As a solution of the present application, the battery packaging structure further includes an electronic wire, one end of the electronic wire is encapsulated in the accommodating cavity to connect to the protection board, and the other end of the electronic wire is located in the Outside the shell.

As a solution of the present application, a gold finger is provided on the protective plate, an opening is provided on the housing to expose the gold finger, and the gold finger and the housing form a side wall of the opening Seal between.

As a solution of the present application, the battery packaging structure further includes a flexible circuit board, one end of the flexible circuit board is encapsulated in the accommodating cavity and connected to the battery, and the other end of the flexible circuit board is located at Outside the housing.

As a solution of the present application, the ratio of the volume of the accommodating cavity to the volume of the portion of the battery packaged in the accommodating cavity is greater than 1 and less than 1.8.

As a solution of the present application, the phase transition temperature of the battery cooling liquid is greater than the heat generation temperature of the portion of the battery packaged in the containing cavity, and the volume of the containing cavity is the same as that of the battery packaged in the housing cavity. The ratio of the volume of the part in the accommodating cavity is greater than 1 and less than 1.2.

As a solution of the present application, the phase transition temperature of the battery coolant is lower than the heat generation temperature of the part of the battery encapsulated in the accommodating cavity, and the volume of the accommodating cavity is the same as that of the battery encapsulated in the battery. The ratio of the volume of the part in the accommodating cavity is greater than 1.3 and less than 1.8.

As a solution of the present application, the distance between the portion of the battery packaged in the accommodating cavity and the inner wall of the casing is 0.2 mm to 20 mm.

In the battery packaging structure of the present application, the battery cooling fluid contained therein is electrically insulated, thereby helping to improve the reliability of the battery packaging structure and avoiding the problem of short circuit caused by the battery cooling fluid; and the battery is packaged in the accommodating cavity Partially immersed in the battery cooling fluid is conducive to fully infiltrating the part of the battery packaged in the accommodating cavity, thereby improving the efficiency of heat dissipation and improving the uniformity of heat dissipation when the battery is in use, and reducing the packaging of the battery Describe the temperature rise rate and amplitude of the part in the accommodating cavity.

Description of the drawings

FIG. 1 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

2 is a schematic cross-sectional view of a battery packaging structure according to an embodiment of the application.

FIG. 3 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

FIG. 4 is a schematic diagram of disassembling the battery packaging structure according to an embodiment of the application.

FIG. 5 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

FIG. 6 is a disassembled schematic diagram of a battery packaging structure according to an embodiment of the application.

FIG. 7 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

FIG. 8 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

FIG. 9 is a disassembled schematic diagram of a battery packaging structure according to an embodiment of the application.

FIG. 10 is a schematic structural diagram of a battery packaging structure according to an embodiment of the application.

FIG. 11 is a temperature rise curve diagram of Example 1 and Comparative Example 1 in this application.

Fig. 12 is a temperature rise curve diagram of Example 2 and Comparative Example 1 in this application.

FIG. 13 is a temperature rise curve diagram of Example 3 and Comparative Example 2 in this application.

FIG. 14 is a temperature rise curve diagram of Example 4 and Comparative Example 2 in this application.

Symbol description of main components

Battery packaging structure

100

电池冷却液 Battery coolant	1010
壳体 case	3030
电池 Battery	5050
容置腔Accommodating cavity	301301
内壁 Inner wall	301a 301a

电池本体Battery body	5151
保护板 Protection board	5353
注液孔 Injection hole	303303
密封件 Seals	305305
上壳体 Upper shell	3131
下壳体 Lower shell	3333
开口 Opening	307、308、309307, 308, 309
金手指 Golden finger	530530
柔性电路板 Flexible circuit board	6060
电子线 Electronic wire	5656
散热结构 Heat dissipation structure	7070

The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of them. Based on the implementation manners in this application, all other implementation manners obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following examples/implementations and features in the examples/implementations can be combined with each other.

Please refer to FIG. 1 and FIG. 2, according to an embodiment of the battery packaging structure 100 of the present application, the battery packaging structure 100 includes a battery cooling liquid 10. The battery cooling fluid 10 is an insulating material.

In some embodiments, the resistivity of the cell coolant is greater than 10 ⁶ ohms. Preferably, the resistivity of the battery cooling liquid is greater than 10 ¹² ohms. The phase transition temperature of the battery cooling liquid may be 38°C to 112°C.

In some embodiments, the battery coolant 10 includes at least one of fluorinated ethers, hydrofluoroalkanes, hydrofluoroamines, perfluoroketones, and perfluorohydrocarbon compounds. The battery coolant 10 is insulated, so When the battery coolant 10 is applied, the reliability is high, and the heat dissipation effect of the battery coolant is good. In some embodiments, the number of carbon atoms in the fluorinated ether, hydrofluoroalkane, hydrofluoroamine, perfluoroketone, and perfluorocarbon compound is 2-9. When the number of carbon atoms exceeds 9, At this time, the correspondingly formed battery coolant may be too viscous or even solid in the battery temperature rise interval, so that effective heat dissipation cannot be achieved in the battery temperature rise interval, and the heat dissipation effect is poor.

In some embodiments, the fluorinated ether may be, but 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, 1,1,1,2,3,4,4,5,5,5-decafluoro-2-trifluoromethylpentane-3-methyl ether, methyl nonafluorobutyl ether , At least one of pentafluoroheptyl ethyl ether, trifluoromethyl ether, perfluoromethyl ethyl ether, trifluoroethyl hexafluoropropyl ether, nonafluorotetrahydropyran, and perfluorocyclic ether.

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

In some embodiments, the hydrofluoroamine may be 1-

butylamine

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

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

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

In some embodiments, the battery cooling liquid 10 may further include additives. The additive may be, but is not limited to, at least one of flame-retardant natural mineral oil, silicone oil, alcohols, alkanes and their derivatives. 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%. If the additive content exceeds 30%, the polarity of the additive and the battery cooling liquid is relatively different. The cooling liquid is prone to phase separation after being heated. In the next charge and discharge cycle, the heat generation process cannot be mixed uniformly, resulting in unstable cooling effect of the battery coolant.

In some embodiments, the additive includes flame-retardant natural mineral oil, and at the same time, it also includes at least one of ethylene glycol and silicone oil. At this time, 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 exceeds 40%, which not only causes the cooling effect of the battery refrigerant to be unstable, but also The high viscosity and high surface energy make it difficult for the battery refrigerant to enter the electronic components of the battery protection board, and the heat dissipation effect is reduced.

Please refer to FIG. 1 and FIG. 2, the battery packaging structure 100 further includes a casing 30 and a battery 50. The housing 30 includes an accommodating cavity 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 encapsulated in the accommodating cavity 301 is immersed in the battery cooling liquid 10, and the battery cooling fluid 10 directly contacts the part of the battery 50 encapsulated in the accommodating cavity 301, and It is beneficial to fully infiltrate the part of the battery 50 packaged in the accommodating cavity 301, thereby improving the efficiency of heat dissipation and improving the uniformity of heat dissipation when the battery 50 is in use, and reducing the packaging of the battery 50 in the accommodating cavity 301 The temperature rise rate and amplitude of the part.

The battery 50 may be a square battery, or other regular-shaped batteries or special-shaped batteries. In this application, a square battery is taken as an example for illustration.

In some embodiments, preferably, the ratio of the volume of the accommodating cavity 301 to the volume of the portion of the battery 50 encapsulated in the accommodating cavity 301 is greater than 1 and less than 1.8.

When the battery packaging structure 100 dissipates the portion of the battery 50 packaged in the accommodating cavity 301 by means of single-phase cooling, preferably, the volume of the accommodating cavity 301 is the same as that of the battery 50 package. The ratio of the volume of the part in the accommodating cavity 301 is greater than 1 and less than 1.2.

When the battery packaging structure 100 dissipates the portion of the battery 50 packaged in the accommodating cavity 301 through the phase change of the battery cooling liquid 10, that is, the phase change temperature of the battery cooling liquid 10 is lower than the When the heat generation temperature of the part of the battery 50 encapsulated in the accommodating cavity 301, preferably, the ratio of the volume of the accommodating cavity 301 to the volume of the part of the battery 50 encapsulated in the accommodating cavity 301 Greater than 1.3 and less than 1.8.

Preferably, the part of the battery 50 enclosed in the accommodating cavity 301 does not contact the housing 30, so that the battery coolant 10 is fully enclosed with the battery 50 in the accommodating cavity 301 In addition, it is also convenient to ensure that there is sufficient battery coolant 10 in the accommodating cavity 301. In addition, it can also reduce the battery 50 encapsulated in the accommodating cavity 301 when the battery packaging structure 100 is subjected to external force. There is a risk of damaging the housing 30 by the inner part. More preferably, the distance between the portion of the battery 50 enclosed in the accommodating cavity 301 and the inner wall 301a of the casing 30 is 0.2 mm-20 mm.

The battery 50 further includes a battery body 51 and a protective 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 composed of a plurality of battery cells connected in series and/or in parallel.

In some embodiments, referring to FIG. 2, the housing 30 is combined with the end of the battery body 51 provided with a protective plate 53 to cooperate to form the accommodating cavity 301, and the protective plate 53 is accommodated in the accommodating chamber 301. It is placed in the cavity 301 and directly immersed in the battery cooling liquid 10 to dissipate heat from the protective plate 53 through the battery cooling liquid 10 when the battery 50 is subsequently used. That is, the part of the battery 50 encapsulated in the accommodating cavity 301 is the protective plate 53.

The housing 30 can be made of a thermally conductive material such as a metal material or a plastic material. Preferably, the material of the housing 30 is a thermally conductive material with a thermal conductivity of 0.2 W/m·K to 5 W/m·K. Preferably, the thickness of the shell 30 may be 0.08mm-2mm.

The metal material may be, but is not limited to, at least one of aluminum, copper, stainless steel, aluminum alloy, and carbon steel. 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), etc. .

The casing 30 is glued to the battery body 51 and seals the connection with the battery body 51.

The housing 30 may also be provided with a liquid injection hole 303 and a sealing member 305. The liquid injection hole 303 communicates with the containing cavity 301 and the outside. The battery coolant 10 is injected into the battery through the liquid injection hole 303 In the accommodating cavity 301. The sealing member 305 cooperates with the liquid injection hole 303 to seal the liquid injection hole 303 to prevent the battery coolant 10 from leaking from the liquid injection hole 303. The sealing member 305 may be, but is not limited to, a rubber plug. The rubber plug and the liquid injection hole 303 can be interference fit, meshed or bonded by an adhesive. It is only necessary to ensure that the rubber plug is connected to the liquid injection hole 303. Seal between them.

As shown in FIG. 1, the housing 30 can be an integral structure. In some embodiments, the housing 30 may include multiple detachable parts. As shown in FIGS. 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 the upper casing 31, the lower casing 33 and one end of the battery body 51 cooperate with each other to form the Housing cavity 301.

When the housing 30 is made of a metal material, the inner wall of the accommodating cavity 301 can also be electrically insulated, for example, an electrical insulating material is plated on the inner wall of the accommodating cavity 301 to form an insulating film (Figure (Not shown) in order to avoid short circuits or potential safety hazards caused by components (such as the protective plate 53) accommodated in the accommodating cavity 301 from contacting the housing 30 due to squeezing or other external forces. Wherein, the electrical insulating material may be a polar thermosetting resin or an electrically insulating carbon material. Preferably, the carbon material can be selected from a diamond-like film material (DLC film material) doped with at least one of aluminum hydroxide, silicon oxide, aluminum oxide, silicon carbide, and silicon nitride, or a non-doped diamond-like film material. Diamond-like carbon film. The carbon material can form an insulating film on the inner wall of the accommodating cavity 301 by means of vacuum plating.

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

In some embodiments, as shown in FIGS. 1 and 2, gold fingers 530 may be provided on the protective plate 53. The housing 30 is provided with an opening 307 to expose the golden finger 530 so that the battery 50 is electrically connected to other electronic components through the golden finger 530; and the golden finger 530 is formed with the housing 30 The side walls of the opening 307 are sealed to prevent the battery coolant 10 from leaking from the opening 307.

In some embodiments, as shown in FIGS. 3 and 4, the battery 50 can be electrically connected to other electronic components through a flexible circuit board 60. Specifically, the housing 30 is provided with an opening 308, one end of the flexible circuit board 60 is encapsulated in the accommodating cavity 301 and connected to the protection board 53, and the other end extends from the opening 308 to the housing. The outside of the body 30 facilitates electrical connection with other electronic components. Wherein, the flexible circuit board 60 is sealed with the side surface of the opening 308 to prevent the battery coolant 10 from leaking from the opening 308.

In some embodiments, referring to FIGS. 5 and 6, the battery packaging structure 100 may further include an electronic wire 56 to facilitate electrical connection with other electronic components. The housing 30 is provided with an opening 309, one end of the electronic wire 56 is encapsulated in the accommodating cavity 301 and connected to the protection board 53, and the other end of the electronic wire 56 extends from the opening 309 Out of the housing 30 to facilitate the external connection of other electronic components. Wherein, the electronic wire 56 is sealed with the side surface of the opening 309 to prevent the battery cooling liquid 10 from leaking from the opening 309.

In some embodiments, referring to FIG. 7, the battery 50 can also be entirely enclosed in the accommodating cavity 301, and the entire battery 50 is immersed in the battery cooling liquid 10, so that the battery 50 can be further used when the battery 50 is in use. Improve heat dissipation efficiency and uniformity of heat dissipation. That is, the battery body 51 and the protection plate 53 are both packaged in the accommodating cavity 301 and immersed in the battery cooling liquid 10.

In some embodiments, it is also possible that only the battery body 51 is located in the accommodating cavity 301 and immersed in the battery cooling liquid 10 while the protective plate 53 is located outside the casing 30.

In some embodiments, the housing 30 can also be made of heat shrinkable film, such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), bidirectional polypropylene ( OPP), polyvinylidene chloride (PVDC), ethylene-vinyl acetate copolymer (EVA), multi-layer co-extruded polyolefin heat shrinkable film (POF), acrylonitrile-butadiene-styrene copolymer (ABS), etc. At least one of the multi-layer co-extruded heat-shrinkable film formed. As shown in FIG. 7, the heat shrinkable film can cover the entire battery 50.

In some embodiments, the housing 30 and the battery 50 can also be arranged independently of each other. For example, as shown in FIGS. 8 and 9, the housing 30 includes an upper housing 31 and a lower housing 33. The upper casing 31 and the lower casing 33 are respectively arranged independently of the battery 50, and the upper casing 31 and the lower casing 33 cooperate and seal 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 grooves 300, and the upper housing 31 and the lower housing 33 are connected and can be folded along the joint to make The two grooves 300 cooperate to form a receiving cavity 301.

In some embodiments, referring to FIG. 10, the battery packaging structure 100 may also include other heat dissipation structures 70, which may be liquid cooling plates, high thermal conductivity materials (such as graphene, graphite sheets), or heat dissipation coatings. Floor. The heat dissipation structure 70 is disposed on the outer surface of the casing 30 to further accelerate the heat dissipation of the battery 50.

This application is further illustrated by comparative examples and examples. A battery is provided, the battery includes a battery body and a protection plate, the battery body is connected to the protection plate through tabs, and the protection plate is encapsulated in a housing cavity of a polyacrylic resin (PMMA) shell, The battery packaging structure of Comparative Example 1 was prepared.

The difference between the battery packaging structure of Example 1 and the battery packaging structure of Comparative Example 1 is that 3 mL of perfluorohexane is used as a battery cooling liquid to be packaged in the containing cavity, and the protective plate is immersed in perfluorohexane.

The batteries of Comparative Example 1 and Example 1 were respectively charged with the same high current, and the temperature of the tabs and the casing were detected at the same time point, and the corresponding data records were plotted as a graph as shown in FIG. 11. It can be seen from FIG. 11 that during the charging process, the temperature of the tab in Example 1 is lowered by 4°C to 7°C compared to the temperature of the tab in Comparative Example 1.

The difference between the battery packaging structure of Example 2 and the battery packaging structure of Comparative Example 1 is that 2 mL of hexafluoropropylene trimer is used as the battery cooling liquid to be packaged in the containing cavity, and the protective plate is immersed in the hexafluoropropylene trimer. Aggregate.

The batteries of Comparative Example 1 and Example 2 were respectively charged with the same high current, and the temperature of the MOS tube on the protection board was detected at the same time point, and the corresponding data records were plotted as a graph as shown in FIG. 12. It can be seen from FIG. 12 that during the charging process, the temperature of the MOS tube in Embodiment 2 is lower by 9°C to 10°C than that of the MOS tube in Comparative Example 1.

The difference between the battery packaging structure of Comparative Example 2 and the battery packaging structure of Comparative Example 1 lies in that the protective plate is encapsulated in an accommodating cavity of a Ta-C-coated aluminum housing.

The difference between the battery packaging structure of Example 3 and the battery packaging structure of Comparative Example 2 is that 1 mL of perfluorotributylamine is used as a battery cooling liquid to be packaged in the containing cavity, and the protective plate is immersed in perfluorotributylamine. middle.

The batteries of Comparative Example 2 and Example 3 were charged with the same high current respectively, and the temperature of the resistor on the protection board was detected at the same time point, and the corresponding data records were plotted as a graph as shown in FIG. 13. It can be seen from FIG. 13 that during the charging process, the temperature of the resistor of Example 3 is lowered by 7°C to 8°C than that of the resistor of Comparative Example 2.

The difference between the battery packaging structure of Example 4 and the battery packaging structure of Comparative Example 2 is that a mixture of 1 mL of hexafluoropropylene trimer (70% by volume) and ethylene glycol (30%) is used as the battery cooling liquid to be packaged. In the accommodating cavity, the protective plate is immersed in the mixed liquid.

The batteries of Comparative Example 2 and Example 4 were charged with the same high current respectively, and the temperature of the MOS tube on the protection board was detected at the same time point, and the corresponding data records were plotted as a graph as shown in FIG. 14. It can be seen from FIG. 14 that during the charging process, the temperature of the MOS tube of Example 4 is lower than that of the MOS tube of Comparative Example 2 by 7°C to 8°C.

The difference between the battery packaging structure of Example 5 and Example 2 is that decafluoropentane is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 5 is lower than that of the MOS tube in Comparative Example 1 by 8°C-9°C.

The difference between the battery packaging structure of Example 6 and Example 2 is that hexafluoropropyl methyl ether is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is lower than that of the MOS tube in Comparative Example 1 by 6°C to 7°C.

The difference between the battery packaging structure of Example 6 and Example 2 is that perfluorohexanone is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is lower than that of the MOS tube in Comparative Example 1 by 9°C to 10°C.

The difference between the battery packaging structure of Example 7 and Example 6 is that a mixture of perfluorohexanone (50%) and hexafluoropropyl methyl ether (50%) is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is reduced by 11°C to 12°C compared to the temperature of the MOS tube in Comparative Example 1.

The difference between the battery packaging structure of Example 8 and Example 6 is that a mixture of perfluorohexanone (50%) and perfluorotributylamine (50%) is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is lower than that of the MOS tube in Comparative Example 1 by 12°C to 13°C.

The difference between the battery packaging structure of Example 9 and Example 5 is that a mixture of decafluoropentane (50%) and perfluorotributylamine (50%) is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is lower than that of the MOS tube in Comparative Example 1 by 8°C-9°C.

The difference between the battery packaging structure of Example 10 and Example 6 is that a mixture of perfluoropentanone (50%) and perfluorotripentylamine (50%) is used as the battery cooling liquid. The battery of Embodiment 5 is charged with the same high current, and the temperature of the MOS tube on the protection board is detected at the same time point. During the charging process, the temperature of the MOS tube in Example 6 is lower than that of the MOS tube in Comparative Example 1 by 12°C to 13°C.

It can be seen from the above that, compared with the comparative example that does not contain the battery coolant, the battery packaging structure of the embodiment in which the protective plate is directly immersed in the battery coolant has a significantly better heat dissipation effect, and the previous temperature rise rate is significantly lower .

In addition, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications should fall within the protection scope of the present application.

Claims

A battery packaging structure, including:

The housing, including the accommodating cavity;

The battery is at least partially encapsulated in the accommodating cavity; and

The battery cooling fluid is characterized in that the battery cooling fluid is an insulating material, the battery cooling fluid is accommodated in the accommodating cavity, and the part of the battery enclosed in the accommodating cavity is immersed in the battery cooling In the liquid.
The battery pack structure according to claim 1, characterized in that the resistivity of the cell coolant is greater than 10 6 ohms.
The battery packaging structure of claim 1, wherein the phase transition temperature of the battery cooling liquid is 38°C to 112°C.
The battery packaging structure of claim 1, wherein the battery is partially or completely enclosed in the containing cavity of the casing, and the battery is immersed in the battery cooling liquid.
The battery packaging structure according to claim 1, wherein the material of the casing is a thermally conductive material with a thermal conductivity of 0.2 W/m·K to 5 W/m·K.
8. The battery packaging structure of claim 1, wherein the casing is a heat shrinkable film.
The battery packaging structure according to claim 1, wherein the battery comprises a battery body and a protection plate provided at one end of the battery body, the protection plate, the battery body or the protection plate and the The combination of the battery body is packaged in the accommodating cavity, and the protection plate, the battery body, or the combination of the protection plate and the battery body is immersed in the battery cooling liquid.
7. The battery packaging structure of claim 7, wherein the casing is combined with the end of the battery body where the protective plate is provided to form a accommodating cavity to accommodate the protective plate in cooperation with the battery body The casing is provided with a liquid injection hole for filling the battery cooling liquid, and the liquid injection hole is sealed by a sealing member.
The battery packaging structure according to claim 7, wherein the housing and the battery are provided independently, the housing includes an upper housing and a lower housing, the upper housing and the lower housing The accommodating cavity is formed by cooperating and sealing to accommodate the protective plate, the battery body, or a combination of the protective plate and the battery body.
7. The battery packaging structure of claim 7, wherein the battery packaging structure further comprises an electronic wire, one end of the electronic wire is encapsulated in the accommodating cavity and connected to the protection board, and the electronic wire The other end is located outside the casing.
7. The battery packaging structure of claim 7, wherein the protective plate is provided with gold fingers, the shell is provided with an opening to expose the gold fingers, and the gold fingers are connected to the shell A seal is formed between the side walls forming the opening.
7. The battery packaging structure of claim 7, wherein the battery packaging structure further comprises a flexible circuit board, one end of the flexible circuit board is encapsulated in the accommodating cavity and connected to the battery, and the flexible circuit board The other end of the circuit board is located outside the casing.
The battery packaging structure of claim 1, wherein the ratio of the volume of the accommodating cavity to the volume of the portion of the battery encapsulated in the accommodating cavity is greater than 1 and less than 1.8.
The battery packaging structure of claim 1, wherein the phase transition temperature of the battery coolant is greater than the heat generation temperature of the portion of the battery packaged in the accommodating cavity, and the volume of the accommodating cavity The ratio to the volume of the part of the battery packaged in the accommodating cavity is greater than 1 and less than 1.2.
The battery packaging structure of claim 1, wherein the phase transition temperature of the battery coolant is lower than the heat generation temperature of the portion of the battery packaged in the accommodating cavity, and the volume of the accommodating cavity The ratio to the volume of the part of the battery packaged in the accommodating cavity is greater than 1.3 and less than 1.8.
8. The battery packaging structure of claim 1, wherein the distance between the portion of the battery packaged in the accommodating cavity and the inner wall of the casing is 0.2 mm to 20 mm.