WO2019113846A1

WO2019113846A1 - Power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery

Info

Publication number: WO2019113846A1
Application number: PCT/CN2017/115990
Authority: WO
Inventors: 许可勤; 胡剑平; 黄骏; 毛小飞
Original assignee: 深圳市海梁科技有限公司
Priority date: 2017-12-11
Filing date: 2017-12-13
Publication date: 2019-06-20
Also published as: CN108232359B; CN108232359A

Abstract

Disclosed is a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery, comprising a case (1) and a plurality of batteries (2), with a plurality of liquid-to-gas conversion plates (3) being mounted in the case (1); and further comprising a gas collector (7), a vapor-to-liquid converter (6), and a temperature-difference power generation plate (8), wherein an inlet of the vapor-to-liquid converter (6) is in communication with an outlet of the gas collector (7), an inlet of the gas collector (7) is in communication with each vent (33), and an outlet of the gas-to-liquid converter (6) is in communication with each liquid inlet (32). Each liquid-to-gas conversion plate (3) absorbs the heat produced by the batteries (2), so that the batteries (2) have a good heat dissipation effect; the vapor-to-liquid converter (6) can convert a gaseous refrigerant into a liquid refrigerant, so that the refrigerant can be recycled; and the temperature-difference power generation plate (8) can convert the heat from the batteries (2) into electric energy. Therefore, the above-mentioned system is not only beneficial for the heat dissipation effect of the batteries (2), but also allows the refrigerant and heat energy to be recycled, so that the energy utilization rate is also high.

Description

Power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery

Technical field

The invention is applicable to the technical field of vehicles, and more particularly to a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery.

Background technique

With the depletion of petroleum resources and increasing environmental protection pressure, replacing traditional fuel vehicles with new energy vehicles has become an inevitable trend of social development. At present, new energy vehicles drive vehicles through the power of the power battery. However, the power battery generates a large amount of heat during charging and discharging. If the heat generated by the power battery cannot be discharged in time, it not only seriously affects the service life of the power battery, but also the power battery may explode and burn because of excessive heat. And so on, causing serious security problems.

technical problem

In the prior art, there are three ways for heat treatment of a power battery: 1. The natural heat dissipation method refers to the purpose of dissipating the heat of the power battery by the convection or heat of the external air to achieve heat dissipation. This kind of heat dissipation method requires that the power battery charge and discharge rate is very low, resulting in low output power of the power battery, low heat dissipation efficiency, which is not conducive to popularization; 2. Air cooling and heat dissipation means that cold air is sent to the power through a fan or the like. The battery gap, which takes away the heat generated by the power battery. This kind of heat dissipation method will cause a large temperature difference between the single power batteries, which is not conducive to the packaging of the power battery, and the heat dissipation effect is poor; 3. The liquid cooling method refers to the heat band of the power battery through the cooling unit and the water cooling circuit. go. The structure of the heat dissipation method is complicated, and if the power of the power battery pack is large, the requirements for the cooling system are high.

In summary, at present, the heat dissipation method of the power battery has the problem of poor heat dissipation, and the heat of the power battery is directly discharged through the heat dissipation device, which not only causes pollution to the environment, but also has low energy utilization rate.

Technical solution

The object of the present invention is to provide a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery, so as to solve the problem of low heat dissipation efficiency and waste of energy of the power battery existing in the prior art.

In order to achieve the above object, the technical solution adopted by the present invention is to provide a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery, comprising a box body and a plurality of batteries disposed in the box body, the cabinet body being installed a plurality of liquid-gas conversion sheets for absorbing heat generated by each of the batteries, wherein each of the liquid-gas conversion sheets is provided with a storage space for storing a refrigerant, and each of the liquid-gas conversion sheets has a liquid inlet at a lower end thereof. The upper end of the liquid-gas conversion sheet is provided with an exhaust port; the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery further includes a gas current collector for collecting gas discharged from each of the liquid-gas conversion sheets, a gas-liquid converter that converts the gas collector exhaust gas into a liquid and a thermoelectric power generation piece that converts heat dissipated by the gas current collector into electric energy, the thermoelectric power generation sheet being attached to the gas current collector Above, an inlet of the gas-liquid converter is in communication with an outlet of the gas current collector, an inlet of the gas current collector is connected to each of the exhaust ports, and an outlet of the gas-liquid converter and each The liquid inlets are in communication.

Further, a heat sink for dissipating heat from the thermoelectric power generation sheet is further included, and the heat sink and the gas current collector cooperate to clamp the thermoelectric power generation sheet.

Further, a communication pipe that communicates with each of the liquid inlets is further included, and the communication pipe is connected to an outlet of the gas-liquid converter.

Further, a gas collecting pipe connecting each of the exhaust ports is further included, and the gas collecting pipe is connected to an inlet of the gas current collector.

Further, the gas-liquid converter includes a liquid storage tank, and a bottom surface of the liquid storage tank is installed with an outlet pipe connecting each of the liquid inlets, and a side of the liquid storage tank is installed to communicate the gas current collection The intake pipe of the device.

Further, a top surface of the liquid storage tank is provided with a liquid injection port, and the gas-liquid converter further includes a sealing cover covering the liquid injection opening.

Further, the gas-liquid converter further includes a plurality of fins mounted on the liquid tank.

Further, the liquid-gas conversion sheet is provided with a partition plate that divides the storage space into a plurality of vertical DC channels.

Further, the gas current collector includes a gas collecting box, and two sides of the gas collecting box are respectively provided with an inlet pipe and an outlet pipe, and the gas collecting box is provided with the inlet pipe and the outlet pipe. Bend the flow path.

Further, the curved flow channel is laid in the gas collecting box in an S shape.

Beneficial effect

The utility model provides a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery, which has the beneficial effects that the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery is provided in the cabinet body more than the prior art. The liquid-gas conversion sheet, the liquid refrigerant in each liquid-gas conversion sheet is vaporized under the action of the high temperature of the battery, thereby absorbing the heat generated by the battery, and the heat dissipation effect of the battery is good. The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery is further provided with a gas current collector, a gas-liquid converter and a thermoelectric power generation piece attached to the gas current collector, the gas-liquid converter can be a gaseous refrigerant Re-converted to liquid refrigerant, the refrigerant can be recycled; the thermoelectric sheet can convert the heat of the battery into electric energy, which is convenient for energy reuse. Therefore, the invention not only has good heat dissipation effect on the battery, but also the refrigerant can be repeatedly used, the heat of the battery can also be converted into electric energy, the energy is recycled, and the energy utilization rate is high.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive workability.

1 is a schematic structural diagram of a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to an embodiment of the present invention;

2 is an exploded view of a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to an embodiment of the present invention;

3 is a top plan view of an interior of a cabinet according to an embodiment of the present invention;

4 is a front view of a liquid-gas conversion sheet according to an embodiment of the present invention;

Figure 5 is a cross-sectional view taken along line A-A of Figure 4;

6 is a schematic structural diagram of a gas-liquid converter according to an embodiment of the present invention;

Figure 7 is a cross-sectional view of a gas current collector according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a thermoelectric power generation chip according to an embodiment of the present invention.

Among them, the figures in the figure are mainly marked:

1-box; 2-battery;

3-liquid-gas conversion sheet; 31-storage space; 32-inlet port; 33-exhaust port; 34-spacer plate;

4-connected pipe; 5-collector;

6-gas-liquid converter; 61-injection port; 62-sealing cap; 63-outlet pipe; 64-intake pipe; 65-heat sink; 66-level indicator; 67-tank;

7-gas current collector; 71-gas box; 72-inlet tube; 73-outlet tube; 74-bent flow channel;

8-temperature difference power generation sheet; 81-hot sheet; 82-cold sheet; 83-P type semiconductor; 84-N type semiconductor; 85-positive output terminal; 86-negative output terminal;

9-heat sink; 10-first connecting tube; 11-second connecting tube; 12-third connecting tube.

Embodiments of the invention

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It is to be noted that when an element is referred to as being "fixed" or "in" another element, it can be directly on the other element or indirectly. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "back", "left", " The orientation or positional relationship of the indications of "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for convenience. The present invention and the simplifications of the invention are not to be construed as limiting or limiting the scope of the invention.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected or electrically connected; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or an interaction relationship of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Referring to FIG. 1 to FIG. 8 together, the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention will now be described. The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery includes a casing 1 and a plurality of batteries 2 disposed in the casing 1, and each of the liquid-gas conversion sheets 3 and the respective batteries 2 are alternately distributed. Here, the battery 2 may have any shape such as a circle or a square. Specifically, a battery 2 is disposed between two adjacent liquid-gas conversion sheets 3, and the contact surfaces of each of the liquid-gas conversion sheets 3 and the battery 2 are coated with a thermal conductive silica gel to reduce thermal resistance, and two of the batteries 2 are respectively The sides can be covered by the liquid-gas conversion sheet 3, so that the heat dissipation effect of each of the batteries 2 is good, and the temperature between the batteries 2 has a good consistency. A plurality of liquid-gas conversion sheets 3 for absorbing heat generated by the plurality of batteries 2 are disposed in the casing 1, and each of the liquid-gas conversion sheets 3 is provided with a storage space 31 for storing the refrigerant. Here, the refrigerant is an organic mixture, and the boiling point of the refrigerant is 37-45 °C. Preferably, the refrigerant is a mixture of ethanol having a mass fraction of 6%, cyclopentane having a mass fraction of 91%, and an antiknock agent having a mass fraction of 3%, the boiling point of the mixture being 44.7 ° C; or, the refrigerant is A mixture of 6.2% methanol, 91.8% by mass of methylene chloride and 2% by mass of antiknock agent having a boiling point of 37.8 °C. Since the boiling point of the refrigerant is very low, the liquid refrigerant in the storage space 31 is converted into a gaseous refrigerant by the thermal vaporization under the action of the heat generated by the battery 2. A liquid inlet 32 is opened at a lower end of one side of each of the liquid-gas conversion sheets 3, and an exhaust port 33 is opened at an upper end of each of the opposite sides of each of the liquid-gas conversion sheets 3.

The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery further includes a gas current collector 7, a gas-liquid converter 6, and a thermoelectric power generation sheet 8 attached to the gas current collector 7. The inlet of the gas-liquid converter 6 and the outlet of the gas collector 7 are communicated through the third connecting pipe 12, and the inlet of the gas current collector 7 communicates with each of the exhaust ports 33 through the second connecting pipe 11, the gas-liquid converter The outlet of 6 communicates with each of the inlet ports 32 through the first connecting pipe 10. The gas current collector 7 collects the gas discharged from the plurality of liquid-gas conversion sheets 3, and transfers the heat of the gas to the thermoelectric power generation sheet 8, which converts the heat into electric energy and stores it. The gas-liquid converter 6 can re-convert the gas discharged from the gas collector 7 into a liquid.

Among them, the liquid-gas conversion sheet 3 and the gas-liquid converter 6 are preferably made of an aluminum alloy or a copper alloy material. In other embodiments, the refrigerant may also be other organic mixtures according to actual needs; the liquid-gas conversion sheet 3 and the gas-liquid converter 6 may also be made of other materials having good heat conductivity, which are not limited herein.

The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention has a plurality of liquid gases disposed in the casing 1 in the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery compared with the prior art. In the conversion sheet 3, the liquid refrigerant in each of the liquid-gas conversion sheets 3 is vaporized by the high temperature of the battery 2, thereby absorbing the heat generated by the battery 2, and the heat dissipation effect of the battery 2 is good. The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery is further provided with a gas current collector 7, a gas-liquid converter 6, and a thermoelectric power generation sheet 8 attached to the gas current collector 7, the gas-liquid converter 6 The gaseous refrigerant can be reconverted into a liquid refrigerant, and the refrigerant can be recycled; the thermoelectric power generation sheet 8 can convert the heat of the battery 2 into electric energy, thereby facilitating the reuse of energy. Therefore, the invention not only has good heat dissipation effect on the battery 2, but also the refrigerant can be repeatedly used, the heat of the battery 2 can also be converted into electric energy, the energy is recycled, and the energy utilization rate is high.

Further, please refer to FIG. 1 and FIG. 8 together as a specific embodiment of a power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, which is based on gas-liquid two-phase heat dissipation and heat energy recovery. The battery system further includes a heat sink 9 for dissipating heat from the thermoelectric power generation sheet 8, and the heat sink 9 and the gas current collector 7 cooperate to sandwich the thermoelectric power generation sheet 8. Specifically, a thermoelectric power generation sheet 8 for converting heat of the battery 2 into electric energy is disposed on one side of the gas current collector 7, and is disposed on the opposite side of the thermoelectric power generation sheet 8 for heat dissipation. Radiator 9. Here, the heat sink 9 is preferably made of a material having a high thermal conductivity such as an aluminum alloy or a copper alloy. In other embodiments, the heat sink 9 can also be made of other materials having excellent thermal conductivity, which is not limited herein.

The thermoelectric power generation sheet 8 includes a heat sheet 81 and a cold sheet 82. Here, the hot sheet 81 and the cold sheet 82 are preferably made of a material having good thermal conductivity such as an aluminum alloy or a copper alloy. A plurality of P-type semiconductors 83 and a plurality of N-type semiconductors 84 are alternately arranged between the hot sheet 81 and the cold sheet 82. The thermoelectric power generation sheet 8 further includes a positive output terminal for supplying power to a battery (not shown). 85 and negative output 86. Here, the voltage of the battery is preferably 24V. Specifically, the hot sheet 81 of the thermoelectric power generation sheet 8 is bonded to the gas current collector 7, and the cold sheet 82 of the thermoelectric power generation sheet 8 is bonded to the heat sink 9. Two adjacent P-type semiconductors 83 and N-type semiconductors 84 are connected by a metal made of an excellent thermal conductive material such as an aluminum alloy or a copper alloy to form a PN junction, and a plurality of PN sections are connected in parallel or in series, and the positive output is The terminal 85 and the negative output terminal 86 are disposed on the P-type semiconductor 83 or the N-type semiconductor 84.

The contact faces of the gas current collector 7 and the thermoelectric power generation sheet 8 are made of a thermally conductive metal material, and the other sides of the gas current collector 7 are made of a heat insulating material. Here, the metal material is preferably an aluminum alloy or a copper alloy. With this configuration, when the gaseous refrigerant carrying a large amount of heat enters the gas current collector 7, the gas current collector 7 concentrates the heat to the heat sheet 81 of the thermoelectric power generation sheet 8 through the contact surface with the thermoelectric power generation sheet 8, and the heat is not It will diffuse out from the other side of the gas collector 7, or have little heat diffused from the other side of the gas collector 7, thereby improving the heat transfer efficiency and improving the energy utilization rate. In other embodiments, the contact surface of the gas current collector 7 and the thermoelectric power generation sheet 8 may be made of other materials having excellent thermal conductivity, which is not limited herein.

The gaseous refrigerant from the liquid-gas conversion sheet 3 with a large amount of heat enters the gas collector 7, and the gas collector 7 transfers the heat to the hot sheet 81 of the thermoelectric power generation sheet 8, in the radiator 9 and the air Under the action of heat transfer, a temperature gradient is generated between the hot sheet 81 of the thermoelectric power generation sheet 8 and the cold sheet 82, and the Seebeck effect is a voltage difference between two substances due to temperature differences between two different electrical conductors or semiconductors. Under the action of the thermoelectric phenomenon, the thermal energy is converted into electric energy by the P-type semiconductor 83, the N-type semiconductor 84 and the PN junction, and the electric energy is stored in the storage battery through the positive output terminal 85 and the negative output terminal 86, so that the heat energy of the battery 2 is recovered. Reduced energy waste. In other embodiments, the hot sheet 81 and the cold sheet 82 may also be made of other materials having excellent thermal conductivity; the voltage of the battery may also be other values, which is not limited herein.

Further, please refer to FIG. 2 together, as a specific implementation manner of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery The communication pipe 4 that connects the respective liquid inlets 32 is connected, and the communication pipe 4 is connected to the outlet of the gas-liquid converter 6. The gas-liquid converter 6 has a function of replenishing and storing a liquid refrigerant. When the battery 2 is in the process of charging and discharging, when the battery 2 needs to be cooled, the liquid refrigerant in the gas-liquid converter 6 flows out from the outlet of the gas-liquid converter 6, and follows the first connecting pipe 10 and the connecting pipe 4 The liquid inlet 32 of the liquid-gas conversion sheet 3 flows into the storage space 31 of each liquid-gas conversion sheet 3, the liquid refrigerant vaporizes under the high temperature released by the battery 2, the liquid refrigerant is converted into a gaseous refrigerant, and the battery 2 is absorbed. The large amount of heat, the gaseous refrigerant carrying a large amount of heat is discharged from the exhaust port 33 of the liquid-gas conversion sheet 3, thereby achieving the effect of lowering the temperature of the battery 2, and the heat dissipation effect of the battery 2 is good.

Further, please refer to FIG. 2 together, as a specific implementation manner of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery A gas collecting pipe 5 is connected to each of the exhaust ports 33, and the gas collecting pipe 5 is connected to the inlet of the gas current collector 7. The gaseous refrigerant carrying a large amount of heat is discharged from the exhaust port 33 of the liquid-gas conversion sheet 3, and enters the gas current collector 7 along the gas collecting pipe 5 and the second connecting pipe 11, and the gas current collector 7 transfers heat. The temperature difference power generating sheet 8 is given, and under the heat transfer action of the heat sink 9 and the air, a temperature gradient is generated between the hot sheet 81 of the thermoelectric power generation sheet 8 and the cold sheet 82, and the heat energy is converted into electric energy by the Seebeck effect. The electric energy is stored in the battery through the positive output terminal 85 and the negative output terminal 86. Therefore, the thermal energy of the battery 2 can be converted into electric energy, the energy can be reused, and the energy utilization rate is high.

Further, please refer to FIG. 6 as a specific embodiment of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, the gas-liquid converter 6 includes a liquid storage tank 67, the liquid storage tank An outlet pipe 63 that connects each of the liquid inlets 32 is attached to the bottom surface of the liquid storage port 67, and an intake pipe 64 that communicates with the gas current collector 7 is attached to the side surface of the liquid storage tank 67. The reservoir 67 has a function of storing a liquid refrigerant. The liquid injection pipe 63 communicates with the communication pipe 4 through the first connecting pipe 10, and the intake pipe 64 communicates with the gas current collector 7 through the second connecting pipe 11, so that the liquid-gas conversion sheet 3, the gas current collector 7, and the gas can be The liquid converter 6 is in communication. The liquid refrigerant stored in the liquid storage tank 67 flows into the liquid-gas conversion sheet 3, and the liquid refrigerant vaporizes into a gaseous refrigerant, and absorbs the heat of the battery 2. The gaseous refrigerant carrying a large amount of heat enters the gas current collector 7, and converts the heat of the battery 2 into electric energy storage under the action of the thermoelectric power generation sheet 8 and the heat sink 9, and the gaseous refrigerant enters the liquid storage tank 67 and is liquefied. The gaseous refrigerant is reconverted to a liquid refrigerant. Therefore, the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery can not only convert the heat energy of the battery 2 into electric energy, but also the refrigerant can be reused, and the energy utilization rate is high. In other embodiments, the outlet tube 63 and the inlet tube 64 may also be disposed at other locations, which are not limited herein.

Further, the bottom surface of the reservoir tank 67 is higher than the surface of the liquid-gas conversion sheet 3. With this configuration, the liquid refrigerant in the reservoir tank 67 flows into the liquid-gas conversion sheet 3 through the outlet pipe 63. Since the bottom surface of the reservoir tank 67 is higher than the surface of the liquid-gas conversion sheet 3, the pressure in the reservoir tank 67 is high. It is higher than the pressure in the liquid-gas conversion sheet 3, and under the action of the pressure difference, the liquid refrigerant can fill the entire liquid-gas conversion sheet 3, and the liquid refrigerant can cover both sides of the battery 2, thereby facilitating the improvement of the battery 2 The amount of heat absorbed, thereby improving the heat dissipation efficiency of the battery 2.

Further, please refer to FIG. 6 as a specific embodiment of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention. The top surface of the liquid storage tank 67 is provided with a liquid injection port 61. The liquid exchanger 6 also includes a sealing cover 62 that covers the liquid inlet 61. The liquid injection port 61 is for adding a liquid refrigerant to the liquid storage tank 67, so that the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery can operate normally. The sealing cover 62 functions to seal the liquid filling port 61. When the gaseous refrigerant flows out of the gas current collector 7 and enters the liquid storage tank 67, the sealing cover 62 prevents overflow and leakage of the gaseous refrigerant, thereby improving energy usage. In other embodiments, the liquid inlet 61 can also be disposed at other locations, which is not limited herein.

A liquid level indicator 66 for monitoring the refrigerant is provided in the reservoir tank 67. When the liquid level of the liquid refrigerant in the gas-liquid converter 6 is lower than the set value, the alarm device (not shown) issues an alarm to remind the user to add the refrigerant, thereby contributing to improving the heat dissipation efficiency of the battery 2 and improving Safety of use of power battery systems based on gas-liquid two-phase heat dissipation and heat recovery. In other embodiments, the level indicator 66 can also be disposed at other locations, which is not uniquely limited herein.

Further, please refer to FIG. 6 as a specific embodiment of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention. The gas-liquid converter 6 further includes a liquid storage tank 6 mounted on the liquid storage tank 67. A plurality of fins 65. When the gaseous refrigerant flows out of the gas current collector 7 and enters the liquid storage tank 67, the temperature in the liquid storage tank 67 is lowered by the action of the plurality of fins 65, and the gaseous refrigerant is liquefied, and the gaseous refrigerant is converted into a liquid state. Refrigerant, so as to achieve the purpose of refrigerant recycling, thereby increasing energy reuse rate and saving energy. In other embodiments, the fins 65 may also be disposed at other locations of the reservoir 67, which are not specifically limited herein.

Further, please refer to FIG. 5 together, as a specific implementation manner of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, the liquid-gas conversion sheet 3 is provided with the storage space 31 divided into several A spacer plate 34 of a vertical DC channel. On the one hand, the partition plate 34 can slow down the rate at which the liquid refrigerant fills the liquid-gas conversion sheet 3, absorbs the heat of the battery 2 for the liquid refrigerant, and provides sufficient time for vaporization to convert into a gaseous refrigerant, thereby improving the vaporization efficiency of the liquid refrigerant; On the one hand, the partition plate 34 has a contact surface in which the respective liquid-gas conversion sheets 3 are attached to the corresponding battery 2 in a harmonica tubular shape. With this configuration, the heat generated by the battery 2 is transferred to the liquid-gas conversion sheet 3 through the tubular spacer 34 of the harmonica, and not only the liquid refrigerant in the storage space 31 can be vaporized, but also the liquid refrigerant can be converted into a gaseous refrigerant. Capillary action (refers to the phenomenon that the immersion liquid rises in the thin tube and the non-wetting liquid descends in the thin tube), the liquid refrigerant can smoothly flow in the partition plate 34, and the bottom surface of the liquid storage tank 67 is high On the surface of the liquid-gas conversion sheet 3, the liquid refrigerant can be filled with the entire liquid-gas conversion sheet 3, thereby achieving a good heat dissipation effect. In other embodiments, the contact surface may also be in other configurations, which is not limited herein.

Further, please refer to FIG. 7 as a specific embodiment of the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the present invention, the gas current collector 7 includes a gas collection box 71, and the gas collection box An inlet pipe 72 and an outlet pipe 73 are respectively disposed on both sides of the 71, and the gas collecting box 71 is provided with a curved flow passage 74 communicating with the inlet pipe 72 and the outlet pipe 73. Specifically, the two sides of the gas collector 7 are respectively provided with an inlet pipe 72 communicating with the gas collecting pipe 5 through the second connecting pipe 11 and an inlet pipe 64 communicating with the gas-liquid converter 6 through the third connecting pipe 12 The outlet pipe 73 and the gas current collector 7 are provided with a curved flow path 74 for transferring the refrigerant. The gaseous refrigerant having a large amount of heat of the battery 2 enters the gas collecting box 71 through the inlet pipe 72, and the curved flow path 74 is preferably laid in the gas collecting box 71 in an S-shape, so that the gaseous refrigerant can be increased through the gas current collector 7. The length of the route facilitates the transfer of a large amount of thermal energy carried by the gaseous refrigerant to the thermoelectric power generation sheet 8, thereby improving the heat transfer efficiency, thereby improving the efficiency of converting thermal energy into electrical energy and improving energy conversion efficiency. In other embodiments, the curved flow path 74 can also be configured in other configurations, which is not limited herein.

The specific operation flow of the present invention is as follows: the liquid refrigerant is injected into the liquid storage tank 67 from the liquid injection port 61 of the gas-liquid converter 6, and after the liquid filling is completed, the liquid filling port 61 is sealed by the sealing cover 62. Since the bottom surface of the liquid storage tank 67 is higher than the surface of the liquid-gas conversion sheet 3, the liquid refrigerant passes through the first connecting pipe 10, the communication pipe 4, and the liquid inlet 32 under the pressure difference and the capillary action of the harmonical tubular spacer 34. Flowing into each of the liquid-gas conversion sheets 3, the heat generated by the battery 2 vaporizes and converts the liquid refrigerant into a gaseous refrigerant, and the heat generated by the battery 2 is absorbed in the process of converting the liquid from the liquid state to the gaseous state, and the gaseous refrigerant is from the liquid gas. The exhaust port 33 of the conversion sheet 3 is discharged, and the gaseous refrigerant enters the gas current collector 7 through the gas collecting pipe 5, the second connecting pipe 11 and the inlet pipe 72 of the gas current collector 7, and the large amount of the battery which the gaseous refrigerant will carry 2 The generated heat is transferred to the heat sheet 81 of the thermoelectric power generation sheet 8, and under the heat transfer action of the heat sink 9 and the air, a temperature gradient is generated between the heat sheet 81 of the thermoelectric power generation sheet 8 and the cold sheet 82, and in the Seebeck effect Under the action, the thermal energy is converted into electric energy, and the electric energy is stored in the storage battery through the positive output terminal 85 and the negative output terminal 86. The gaseous refrigerant is discharged from the outlet pipe 73 of the gas collector 7, passes through the third connecting pipe 12 and the intake pipe 64 of the gas-liquid converter 6, enters the gas-liquid converter 6, and is subjected to the heat transfer of the fins 65 and the air. The gaseous refrigerant liquefies and is converted into a liquid refrigerant.

The communication tube 4, the air collection tube 5, the first connection tube 10, the second connection tube 11 and the third connection tube 12 are all made of a plastic material having a low thermal conductivity to prevent heat loss. In other embodiments, other materials having a lower thermal conductivity may also be made. The gas-liquid conversion sheet 6, the heat sink 65, the gas current collector 7, the thermoelectric power generation sheet 8, and the heat sink 9 are all disposed outside the casing 1, and are disposed in a well-ventilated place.

The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery provided by the invention can be used for heat dissipation treatment of the battery 2, and is particularly suitable for a high-power power battery, and has good heat dissipation effect, and can also convert the heat generated by the battery 2 into Energy, energy can be recycled to improve energy utilization. The refrigerant can be converted from a liquid state to a gaseous state, and then from a gaseous state to a liquid state, so that the refrigerant can be reused, further improving the energy use efficiency and saving the use cost.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

Claims

A power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery, comprising a box body and a plurality of batteries disposed in the box body, wherein: a plurality of batteries for absorbing heat generated by each of the batteries are installed in the box body a liquid-gas conversion sheet, wherein each of the liquid-gas conversion sheets is provided with a storage space for storing a refrigerant, and a liquid inlet port is disposed at a lower end of each of the liquid-gas conversion sheets, and an upper end of each of the liquid-gas conversion sheets is opened An exhaust port; the power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery further includes a gas current collector for collecting gas discharged from each of the liquid-gas conversion sheets, and converting the gas collector exhaust gas a gas-liquid converter for liquid and a thermoelectric power generation sheet for converting heat dissipated from the gas current collector into electrical energy, the thermoelectric power generation sheet being attached to the gas current collector, the inlet of the gas-liquid converter An inlet of the gas current collector is in communication with an outlet of the gas current collector, and an outlet of the gas-liquid converter is in communication with each of the liquid inlets.
A power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 1, further comprising: a heat sink for dissipating heat of said thermoelectric power generation piece, said heat sink and said gas set The flow device cooperates to clamp the thermoelectric power generation piece.
A power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 1, further comprising: a communication pipe that communicates with each of said liquid inlets, said communication pipe and said gas-liquid converter Exports are connected.
A power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 1, further comprising: a gas collecting pipe that communicates with each of said exhaust ports, said gas collecting pipe and said gas current collector The entrance is connected.
A gas-liquid two-phase heat dissipation and heat energy recovery power battery system according to claim 1, wherein said gas-liquid converter comprises a liquid storage tank, and said bottom surface of said liquid storage tank is connected with said each An outlet pipe of the liquid port, the side of the liquid storage tank is provided with an intake pipe that communicates with the gas current collector.
The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 5, wherein the top surface of the liquid storage tank is provided with a liquid injection port, and the gas-liquid converter further comprises a cover Describe the sealing cap on the liquid port.
The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 5, wherein the gas-liquid converter further comprises a plurality of fins mounted on the liquid storage tank.
The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 1, wherein the liquid-gas conversion sheet is provided with a partition plate that divides the storage space into a plurality of vertical DC channels.
The gas battery system for gas-liquid two-phase heat dissipation and heat energy recovery according to claim 1, wherein the gas current collector comprises a gas collecting box, and two sides of the gas collecting box are respectively provided with an inlet pipe and An outlet pipe, wherein the gas collecting box is provided with a curved flow passage connecting the inlet pipe and the outlet pipe.
The power battery system based on gas-liquid two-phase heat dissipation and heat energy recovery according to claim 9, wherein the curved flow path is S-shaped and laid in the gas collecting box.