CN215771286U

CN215771286U - Heat conduction plate for high-power storage battery cell of rail transit vehicle

Info

Publication number: CN215771286U
Application number: CN202122279774.0U
Authority: CN
Inventors: 袁磊; 任智达; 李峰; 闫春霆; 蔡欢
Original assignee: CRRC Dalian Institute Co Ltd
Current assignee: CRRC Dalian Institute Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-02-08
Anticipated expiration: 2031-09-18

Abstract

The utility model discloses a heat conduction plate for a high-power storage battery cell of a rail transit vehicle, wherein a heat source is arranged above the heat conduction plate, and a cold source is arranged below the heat conduction plate. According to the heat conduction plate for the battery cell, the adjacent working medium flow channels are alternately arranged, so that cold and heat transfer is performed between the upper heat source and the lower cold source, and heat transfer is performed between the liquid at the condensation end and the heat source end through the capillary action force of the liquid absorption core, so that the problem of temperature nonuniformity of the battery cell is solved, the heat conduction plate has good heat conductivity, the battery cell can integrally keep good temperature uniformity, the heat exchange efficiency of the battery cell is improved, and the application range is wide.

Description

Heat conduction plate for high-power storage battery cell of rail transit vehicle

Technical Field

The utility model relates to the technical field of phase change heat exchange, in particular to a heat conduction plate for a high-power storage battery cell of a rail transit vehicle.

Background

In recent years, with the increasing prominence of energy crisis and environmental problems, energy development strategies are actively made in all countries of the world to develop new energy and renewable energy. The power battery is used as a novel energy source and widely applied to the aspects of electric automobiles, hybrid locomotives, motor train units, power grid energy storage and the like. At present, the power lithium battery in the field of rail transit is developing towards high energy density, large capacity, high power and high safety and reliability, which puts higher requirements on the thermal management of the power lithium battery.

Firstly, because the electrochemical reaction of the battery is greatly influenced by the temperature of the battery, the temperature of the battery can influence the energy and the efficiency in the using process; secondly, the thermal energy temperature of the battery pack directly affects the safety of the battery, and the uniformity of the internal temperature of the battery pack and the temperature of the working environment directly affect the service life of the battery. Usually, a high-power storage battery of a rail transit vehicle is composed of a plurality of modules, and each module is composed of a plurality of battery cores. The high-power storage battery of the existing traffic vehicle has the phenomenon that the temperature of the battery core is too high or too low and uneven due to low heat exchange efficiency among a plurality of battery cores, and further the uniformity of the overall temperature of the battery core cannot be ensured.

Disclosure of Invention

The utility model provides a heat conduction plate for a high-power storage battery cell of a rail transit vehicle, which aims to solve the problem of the uniformity of the overall temperature of the battery cell.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a heat conduction plate for a high-power storage battery cell of a rail transit vehicle is characterized in that a heat source is arranged above the heat conduction plate, a cold source is arranged below the heat conduction plate, a plurality of working medium flow channels which are alternately arranged are arranged in the heat conduction plate, a liquid suction core is arranged in each working medium flow channel, and the length of each working medium flow channel is smaller than the rising height of the capillary force of the liquid suction core.

Furthermore, the overlapping length of two adjacent working medium flow channels is less than 1/2 of the length of the whole working medium flow channel and is greater than 1/3 of the length of the whole working medium flow channel.

Further, the wick has a rise height of capillary force of less than 75 mm.

Furthermore, the heat conduction plate comprises an upper cover plate, a lower cover plate and a heat conduction plate core body, the upper cover plate and the lower cover plate are welded on two sides of the heat conduction plate core body, and the heat conduction plate core body is provided with the working medium flow channel.

Further, the wick is any one of metal particles, porous media and chopped fibers.

According to the heat conduction plate for the battery core, the adjacent working medium flow channels are alternately arranged, so that cold and heat transfer is performed between the upper heat source and the lower cold source, and heat transfer is performed between the liquid at the condensation end and the heat source end through the capillary action force of the liquid absorption core, so that the problem of nonuniformity of the temperature of the battery core is solved, the heat conduction plate has good heat conductivity, the battery core can integrally keep good temperature uniformity, the heat exchange efficiency of the battery core is improved, and the application range is wide.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are 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 schematic diagram of a heat conduction plate structure for a high-power storage battery cell of a rail transit vehicle according to the present invention;

FIG. 2 is a sectional view of a heat conduction plate structure for a high-power storage battery cell of a rail transit vehicle;

FIG. 3 is a three-dimensional structure diagram of a heat conduction plate for a high-power storage battery cell of a rail transit vehicle;

fig. 4 is a working schematic diagram of a heat conduction plate for a high-power storage battery cell of a rail transit vehicle.

In the figure, 2, a heat conduction plate core body, 3, a liquid absorption core, 4, working medium flow channels, 5, a first working medium flow channel, 6, a second working medium flow channel, 7, a third working medium flow channel, 8, a fourth working medium flow channel, 9 and a fifth working medium flow channel.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-4, the heat conduction plate for the electric core of the high-power storage battery of the rail transit vehicle is provided with a heat source arranged above the heat conduction plate, a cold source arranged below the heat conduction plate, a plurality of working medium flow channels 4 arranged alternately are arranged in the heat conduction plate, a liquid absorption core 3 is arranged in each working medium flow channel 4, and the length of each working medium flow channel 4 is smaller than the rising height of the capillary force of the liquid absorption core 3. In this embodiment, preferably, the wick 3 and the heat conduction plate core 2 are welded by diffusion welding, the heat conduction plate core 2 is made of aluminum alloy, a plurality of working medium flow channels in the vertical direction are arranged in the heat conduction plate core 2, the working medium is uniformly distributed on the side wall of the whole channel by using the capillary force of the wick 3 and the length of the working medium flow channel in each channel, the working medium at the lower end is sucked back to the heat source end at the upper end under the action of the capillary force between the heat source at the upper part and the cold source at the lower part through the lifting force of the capillary force of the wick 3, and finally, the heat at the upper part is transferred to the lower part through heat transfer, so that the temperature of the whole heat conduction plate is uniform. According to the length of the heat conduction plate required in actual use, the number of the working medium flow channels 4 is set, preferably, the length of the working medium flow channels 4 in the vertical direction is smaller than the rising height of the capillary force of the liquid suction core 3, so that heat transfer between a heat source at the upper end and a cold source at the lower end can be realized, liquid at the lower end is sucked to the upper end under the action of the capillary force, and the dry burning phenomenon of the working medium flow channels 4 is prevented.

Further, the length of the overlap of two adjacent working medium flow channels 4 is less than 1/2 of the length of the whole working medium flow channel 4 and is greater than 1/3 of the length of the whole working medium flow channel 4.

Further, the rise height of the capillary force of the wick 3 is less than 75 mm.

Further, the heat conduction plate comprises an upper cover plate, a lower cover plate and a heat conduction plate core body 2, the upper cover plate and the lower cover plate are welded on two sides of the heat conduction plate core body, and the working medium flow channel 4 is arranged on the heat conduction plate core body 2. In this embodiment, the upper cover plate and the lower cover plate are welded to both sides of the heat conductive core 2, so that the heat conductive plate is sealed, thereby achieving heat transfer of the heat conductive plate and making the temperature of the heat conductive plate uniform.

Further, the wick 3 is any one of metal particles, porous media and chopped fibers. In this embodiment, preferably, the porous medium is an aluminum alloy antler fiber liquid absorption core, the capillary suction force of the aluminum alloy antler fiber liquid absorption core is 75mm, the capillary force of the aluminum alloy antler fiber liquid absorption core is far higher than that of an existing groove, a wire mesh, metal particles and the like, and a dry burning phenomenon does not occur in the working medium channel.

As shown in fig. 4, the upper end of the second working medium flow channel 6 is lower than the upper end of the first working medium flow channel 5, the second working medium flow channel 6 is arranged at one side of the first working medium flow channel 5 and the third working medium flow channel 7, and so on, the working medium flow channels are alternately arranged in the heat conduction plate. The heat conduction condition of each working medium flow channel during working is that the hot end of the first working medium flow channel 5 transfers heat to the cold end of the first working medium flow channel 5, and the cold end of the first working medium flow channel 5 and the hot end of the second working medium flow channel 6 are alternately cooled and heated; the hot end of the second working medium flow channel 6 transfers heat to the cold end of the second working medium flow channel 6, and the cold end of the second working medium flow channel 6 and the hot end of the third working medium flow channel 7 are alternately cooled and heated; the hot end of the third working medium flow channel 7 transfers heat to the cold end of the third working medium flow channel 7, and the cold end of the third working medium flow channel 7 and the hot end of the fourth working medium flow channel 8 are alternately cooled and heated; the hot end of the fourth working medium flow channel 8 transfers heat to the cold end of the fourth working medium flow channel 8, the cold end of the fourth working medium flow channel 8 and the hot end of the fifth working medium flow channel are alternately transferred, so that the working medium at the upper end of the working medium flow channel is evaporated, the working medium at the lower end is condensed, the liquid working medium is sucked back to the upper part by the liquid suction core 3, and finally the heat at the upper part of the heat conduction plate is transferred to the lower part step by step, so that the temperature of the heat conduction plate is uniform.

In the embodiment, the total height of the heat conduction plate in the vertical direction is 200mm, the thickness is 0.8-0.5 mm, the working temperature is-20 ℃ -60 ℃, and the heat conduction plate core body 2 is arranged between adjacent electric cores and is vertical to the electric cores. The heat conduction plate core body 2 is vertically arranged with the battery core, so that the lug of the heat conduction plate core body is arranged at the upper part, and the cold source or the liquid cooling plate is arranged at the lower part. Place the centre at two electric cores with heat-conducting plate, the utmost point ear of electric core is in electric core top, because during electric core charge-discharge, the temperature of utmost point ear is obviously higher than other regions, because the heat conductivility of heat-conducting plate is more than 10 times of copper alloy material, adopt the heat-conducting plate that the heat conductivity is very good, can conduct the lower region of other temperatures to the heat of utmost point ear, the difference in temperature control in the different regions of messenger's electric core is in the certain extent, local electric core overheated phenomenon can not appear, thereby ensure electric core normal work, prolong its life. The phase-change heat conduction utilizes the phase-change heat conduction of the working medium to ensure that the heat conduction plate has the heat conduction performance which is several times higher than that of common metals, and the heat conduction performance of the heat conduction plate is more than 10 times of that of a copper alloy material, so that the phase-change heat conduction plate is very suitable for temperature equalization of a high-power-density battery core. In addition, the heat conduction plate is tightly attached to the two battery cores, and the heat conduction plate does not need additional power and can be self-adaptive and actively adjust the temperature difference between the upper part and the lower part of the battery cores.

For the battery cell with the heating power less than 5W, the temperature difference of the battery cell in the vertical direction can be less than 4 ℃ by using the heat conduction plate. Wherein, the power that generates heat is bigger, and the temperature difference change of electric core is just bigger, and the free power that generates heat of electric core is about 4W generally at present, consequently adopts the inhomogeneous phenomenon of solution electric core temperature that the heat-conduction board of this embodiment can be fine.

The heat conduction plate for the electric core of the high-power storage battery of the railway vehicle has the following advantages that: the phase-change heat conduction plate has better heat conductivity, and the heat conduction effect of the heat conduction plate is about 5 times better than that of a copper plate due to the fact that the heat conduction plate is made of aluminum alloy; when the battery cell is charged and discharged at 5 ℃, the temperature difference between the heat source end and the cold source end can be adjusted within 5 ℃, so that the whole battery cell can keep better temperature uniformity, the phase-change heat conduction plate can improve the heat exchange efficiency of the whole battery, the phase-change heat conduction plate can be widely applied to power batteries and heat storage energy storage batteries of rail transit and power transmission and transformation, one of effective means for solving the temperature uniformity of the battery and improving the working efficiency and reliability can be realized, and the battery cell has a wide market prospect.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a high-power of track traffic vehicle heat-transfer board for battery electricity core, the heat source sets up the top of heat-transfer board, and the cold source sets up the below at the heat-transfer board, its characterized in that, be equipped with a plurality of working medium flow path (4) that set up in turn in the heat-transfer board, be equipped with in working medium flow path (4) and inhale liquid core (3), just the length of working medium flow path (4) is less than the rise height of the capillary force of inhaling liquid core (3).

2. The heat conduction plate for the high-power storage battery cell of the rail transit vehicle as claimed in claim 1, wherein the overlapping length of two adjacent working medium flow channels (4) is less than 1/2 of the length of the whole working medium flow channel (4) and is greater than 1/3 of the length of the whole working medium flow channel (4).

3. The heat conduction plate for the high-power rail transit vehicle storage battery cell as claimed in claim 1, wherein the rising height of the capillary force of the liquid absorption core (3) is less than 75 mm.

4. The heat conduction plate for the high-power storage battery cell of the rail transit vehicle as claimed in claim 1, wherein the heat conduction plate comprises an upper cover plate, a lower cover plate and a heat conduction plate core (2), the upper cover plate and the lower cover plate are welded on two sides of the heat conduction plate core, and the working medium flow channel (4) is arranged on the heat conduction plate core (2).

5. The heat conduction plate for the high-power storage battery cell of the rail transit vehicle as claimed in claim 1, wherein the wick (3) is any one of metal particles, porous media and chopped fibers.