CN213878205U - Power battery's heat radiation structure and power battery - Google Patents

Power battery's heat radiation structure and power battery Download PDF

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Publication number
CN213878205U
CN213878205U CN202023163782.0U CN202023163782U CN213878205U CN 213878205 U CN213878205 U CN 213878205U CN 202023163782 U CN202023163782 U CN 202023163782U CN 213878205 U CN213878205 U CN 213878205U
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heat dissipation
power battery
wall
dissipation layer
liquid metal
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CN202023163782.0U
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滕胜
甘章华
贾涓
杨双峰
章祥杰
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Wuhan Yanfeng Times Detection Technology Co ltd
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Wuhan Yanfeng Times Detection Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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Abstract

The utility model provides a heat radiation structure of power battery, including the reactor, casing and pole piece, the reactor includes positive pole material, negative pole material and electrolyte that pack with coiling mode or lamination mode, still includes the heat dissipation layer, and the contact surface of reactor and casing inner wall is for pasting the covering surface, and the heat dissipation layer is closely packed between covering surface and the casing inner wall, and the heat dissipation layer is liquid metal; when the temperature of the reaction body rises due to power generation reaction, the heat dissipation layer is melted along with the rise of the temperature and can flow between the attaching surface and the inner wall of the shell, and the heat dissipation layer is always positioned between the attaching surface and the inner wall of the shell under the action of the surface tension of the liquid metal; utilize the heat-conducting property of liquid metal, can improve the reaction of the reactant and generate heat and conduct the efficiency that carries out the diffusion to the casing, utilize the characteristic that the melting of being heated of liquid metal can flow simultaneously, make liquid metal fill in pasting the unevenness of covering and shells inner wall, avoid the air bubble to hinder hot-conductive problem. The utility model also provides a power battery, power battery adopts foretell heat radiation structure.

Description

Power battery's heat radiation structure and power battery
Technical Field
The utility model relates to a battery heat dissipation technical field especially relates to a power battery's heat radiation structure and power battery.
Background
In order to meet the requirements of industries such as automobiles and energy storage on high-capacity and high-power battery technologies, the battery cells are limited by the small capacity and low power of the battery cells at the present stage, and the battery cells are usually combined into a battery pack through series and parallel connection for use. Due to the electrochemical properties of the cell itself, the cell can release a large amount of heat during operation, resulting in an increase in the temperature of the battery. The battery can reduce the available capacity and accelerate the life attenuation when working at high temperature or large temperature difference for a long time, and the efficient battery heat dissipation technology can effectively reduce the working temperature of the battery pack and the temperature difference between the monomers, thereby having important significance for improving the available capacity and the service life of the battery pack.
At present, the research on battery heat dissipation technology is mainly performed on modular battery packs, and the main heat dissipation modes include air cooling, liquid cooling, phase change material cooling, air conditioner cooling and the like. With the progress of research, the liquid cooling method using liquid metal is gradually paid attention to by technicians.
However, the liquid cooling method using liquid metal only increases the efficiency of heat diffusion, but cannot increase the heat dissipation performance of the battery cell fundamentally, so that the heat diffusion effects of different parts in the battery pack are still inconsistent, the liquid cooling efficiency is low, and the cost is high.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an effectual heat radiation structure and the power battery who promotes the free heat dispersion of battery power battery.
The technical scheme of the utility model is realized like this: the utility model provides a power battery's heat radiation structure, including the reaction body, casing and pole piece, the reaction body includes positive pole material, negative pole material and electrolyte that pack with coiling mode or lamination mode, the reaction body is used for the electricity generation reaction, the casing closely wraps up outside the reaction body, pole piece fixed mounting is on the casing, the pole piece includes positive and negative pole piece and respectively electric connection in the positive pole material and the negative pole material of reaction body, still include the heat dissipation layer, the contact surface of reaction body and shells inner wall is for pasting the covering surface, the heat dissipation layer closely fills between pasting covering surface and shells inner wall, the heat dissipation layer is liquid metal; when the temperature of the reaction body rises due to power generation reaction, the heat dissipation layer is melted along with the rise of the temperature and can flow between the facing surface and the inner wall of the shell, and the heat dissipation layer is always positioned between the facing surface and the inner wall of the shell under the action of the surface tension of the liquid metal.
On the basis of the technical scheme, preferably, the heat dissipation layer is tightly attached to the inner wall of the shell in a spraying or smearing mode and is tightly contacted with the attaching surface.
On the basis of the above technical solution, it is preferable that when the reaction body is packaged in a winding manner, the facing surface is the entire outer surface of the reaction body around the winding axis of the reaction body.
On the basis of the above technical solution, preferably, when the reaction body is packed in a lamination manner, the attaching surfaces are two outer surface end surfaces of the reaction body parallel to the plane of the lamination.
It is further preferred that the area of the heat dissipation layer covering the inner wall of the housing does not exceed the area of the facing surface.
On the basis of the technical scheme, preferably, the liquid metal is gallium-based normal-temperature liquid metal.
Still more preferably, the liquid metal is gallium, a gallium indium alloy, a gallium indium tin alloy, or a gallium indium tin zinc alloy.
Based on the above technical solution, the thickness of the heat dissipation layer is preferably 300nm to 500 nm.
In a second aspect, the utility model provides a power battery, power battery adopt foretell heat radiation structure.
The utility model discloses a power battery's heat radiation structure and power battery have following beneficial effect for prior art:
(1) the utility model discloses set up the heat dissipation layer between subsides covering and shells inner wall, and the heat dissipation layer is liquid metal, utilizes liquid metal's heat-conduction performance, can improve the reaction of reacting the body and generate heat and conduct to the casing and carry out the efficiency that diffuses, utilizes the characteristic that the melting that is heated of liquid metal can flow simultaneously, makes liquid metal fill in the unevenness of subsides covering and shells inner wall, avoids the air bubble to obstruct heat-conduction's problem.
(2) The heat dissipation layer is applied to the inner wall of the shell in a smearing or spraying mode and is pressed on the attaching surface, and meanwhile the covering area of the heat dissipation layer is set to be not more than the attaching surface, so that liquid metal can freely flow in a gap between the inner wall of the shell and the attaching surface, and meanwhile, the gap cannot overflow.
(3) The thickness of the heat dissipation layer is limited, so that the liquid metal can be prevented from overflowing out of a gap between the inner wall of the shell and the attaching surface under the action of the surface tension of the liquid metal.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a side cross-sectional view of a battery cooling structure of the present invention packaged in a rolled manner;
fig. 2 is a side sectional view of the cooling structure of the battery packed in the lamination manner according to the present invention.
In the figure: 1. a reactant; 11. pasting a covering surface; 2. a housing; 3. a heat dissipation layer; 4. and (6) pole pieces.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
The utility model discloses a power battery's heat radiation structure, including reaction body 1, casing 2 and pole piece 4, reaction body 1 includes positive electrode material, negative electrode material and the electrolyte that packs with coiling mode or lamination mode, and reaction body 1 is used for the electricity generation reaction, and casing 2 closely wraps up outside reaction body 1, and 4 fixed mounting of pole piece are on casing 2, and pole piece 4 includes positive and negative pole piece and difference electric connection in the positive electrode material and the negative electrode material of reaction body 1, still include heat dissipation layer 3.
Wherein, the contact surface of the reaction body 1 and the inner wall of the shell 2 is a pasting surface 11, the heat dissipation layer 3 is tightly filled between the pasting surface 11 and the inner wall of the shell 2, and the heat dissipation layer 3 is liquid metal. Wherein, the liquid metal is gallium base normal atmospheric temperature liquid metal, compares in the common aluminum hull or the plastic-aluminum membrane of the casing 2 of current battery, and gallium base alloy has better heat conductivility to hot conductive efficiency has been improved.
When the technical scheme is adopted, when the temperature of the reaction body 1 rises due to power generation reaction, the heat dissipation layer 3 is melted along with the rise of the temperature and can flow between the attaching surface 11 and the inner wall of the shell 2, and the heat dissipation layer 3 is always positioned between the attaching surface 11 and the inner wall of the shell 2 under the action of the surface tension of liquid metal, so that the heat dissipation efficiency in the battery monomer is improved; meanwhile, when the heat dissipation layer 3 is arranged between the inner wall of the shell 2 and the attaching surface 11, the liquid metal is heated and melted, so that the liquid metal flows and is filled in pits on the inner wall of the shell 2 and the attaching surface 11, air bubbles are removed or confined in the liquid metal, bad factors hindering heat conduction are eliminated, heat conduction efficiency is improved, and heat dissipation performance of the battery monomer is fundamentally improved.
As shown in fig. 1, when the reaction body 1 is packed in a winding manner, the coating surface 11 is the entire outer surface of the reaction body 1 around the winding axis of the reaction body 1.
As shown in fig. 1, when the reaction body 1 is packed in a lamination manner, the facing surfaces 11 are two outer surface end surfaces of the reaction body 1 parallel to the plane of the lamination.
The area of the heat dissipation layer 3 covering the inner wall of the shell 2 is not more than the area of the covering surface 11, so that the problem of overflow caused by volume increase due to expansion with heat and contraction with cold after liquid metal is heated and melted is avoided.
As the utility model discloses further improvement, the thickness that restricts heat dissipation layer 3 is 300nm to 500nm to make liquid metal can avoid the overflow to flow out 2 inner walls of casing and paste the space between the face 11 through the surface tension effect of self.
As an alternative embodiment, the heat dissipation layer 3 is closely adhered to the inner wall of the shell 2 and closely contacts the facing 11 by spraying or smearing, and is suitable for large-scale and standardized industrial production.
As an alternative embodiment, the liquid metal is gallium, gallium indium alloy, gallium indium tin alloy or gallium indium tin zinc alloy, and specifically may be Ga68In20Sn12Or Ga67In20.5Sn12.5。
On the other hand, the power battery adopts the heat dissipation structure.
The working principle is as follows:
the reaction body 1 generates heat and increases temperature by performing discharge reaction, and the heat is conducted to the shell 2 through the heat dissipation layer 3 to be dissipated and cooled by heat diffusion.
In this process, since the heat dissipation layer 3 is made of liquid metal, especially gallium-based alloy, the gallium-based alloy has better heat conduction performance than an aluminum case or an aluminum-plastic film commonly used in the case 2 of the conventional battery, and thus the heat conduction efficiency is improved.
In addition, the inner wall of the case 2 and the attaching surface 11 of the battery are both planar in an ideal situation, however, in actual production, due to technical limitations, the surfaces of the two inevitably have many depressions or uneven surfaces which are invisible to the naked eye on a microscopic level, and therefore when the inner wall of the case 2 and the attaching surface 11 are attached to each other, air bubbles inevitably exist between the two, and the air bubbles have a certain heat insulation effect, which hinders the heat conduction.
When the heat dissipation layer 3 of the liquid metal is arranged between the inner wall of the shell 2 and the attaching surface 11, the liquid metal is heated and melted, so that the liquid metal flows and fills in pits on the inner wall of the shell 2 and the attaching surface 11, air bubbles are removed or confined in the liquid metal, bad factors hindering heat conduction are eliminated, heat conduction efficiency is improved, and heat dissipation performance of the battery monomer is fundamentally improved.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a power battery's heat radiation structure, including reactant (1), casing (2) and pole piece (4), reactant (1) is including carrying out the positive electrode material of packing with coiling mode or lamination mode, negative electrode material and electrolyte, reactant (1) is used for the electricity generation reaction, casing (2) closely wraps up outside reactant (1), pole piece (4) fixed mounting is on casing (2), pole piece (4) include positive negative pole piece and respectively electric connection in the positive electrode material and the negative electrode material of reactant (1), its characterized in that: the reaction body is characterized by further comprising a heat dissipation layer (3), the contact surface of the reaction body (1) and the inner wall of the shell (2) is a coating surface (11), the heat dissipation layer (3) is tightly filled between the coating surface (11) and the inner wall of the shell (2), and the heat dissipation layer (3) is liquid metal;
when the temperature of the reaction body (1) rises due to power generation reaction, the heat dissipation layer (3) is melted along with the temperature rise and can flow between the attaching surface (11) and the inner wall of the shell (2), and the heat dissipation layer (3) is always positioned between the attaching surface (11) and the inner wall of the shell (2) under the surface tension action of liquid metal.
2. The heat dissipation structure of a power battery according to claim 1, wherein: the heat dissipation layer (3) is tightly adhered to the inner wall of the shell (2) in a spraying or smearing mode and is tightly contacted with the adhering surface (11).
3. The heat dissipation structure of a power battery according to claim 1, wherein: when the reaction body (1) is packaged in a winding mode, the coating surface (11) is the whole outer surface of the reaction body (1) around the winding axis of the reaction body (1).
4. The heat dissipation structure of a power battery according to claim 1, wherein: when the reaction bodies (1) are packaged in a lamination mode, the attaching faces (11) are the end faces of the outer surfaces of the two reaction bodies (1) parallel to the plane of the lamination.
5. The heat dissipation structure of a power battery according to claim 3 or 4, wherein: the area of the heat dissipation layer (3) covering the inner wall of the shell (2) does not exceed the area of the attaching surface (11).
6. The heat dissipation structure of a power battery according to claim 1, wherein: the liquid metal is gallium-based normal-temperature liquid metal.
7. The heat dissipation structure of a power battery according to claim 6, wherein: the liquid metal is gallium, gallium indium alloy, gallium indium tin alloy or gallium indium tin zinc alloy.
8. The heat dissipation structure of a power battery according to claim 1, wherein: the thickness of the heat dissipation layer (3) is 300nm to 500 nm.
9. A power battery, characterized by: the power battery adopts the heat dissipation structure of any one of claims 1 to 8.
CN202023163782.0U 2020-12-24 2020-12-24 Power battery's heat radiation structure and power battery Active CN213878205U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202023163782.0U CN213878205U (en) 2020-12-24 2020-12-24 Power battery's heat radiation structure and power battery

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Application Number Priority Date Filing Date Title
CN202023163782.0U CN213878205U (en) 2020-12-24 2020-12-24 Power battery's heat radiation structure and power battery

Publications (1)

Publication Number Publication Date
CN213878205U true CN213878205U (en) 2021-08-03

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