A gas-liquid phase change cooling device for a battery

Abstract

The present invention relates to a gas-liquid phase change cooling device for a battery, which includes a liquid cooling layer A composed of a plurality of liquid cooling plates arranged side by side. A placement area for accommodating a row of batteries is vacated between two adjacent liquid cooling plates, and can form an abutment with the contact surfaces on both sides of the battery. Each liquid cooling plate has an internal flow channel, as well as a hot end and a cold end located at both ends. The device further includes a condenser, and the liquid cooling plate is communicated with the condenser to form a phase change cooling loop. The internal flow channel of the liquid cooling plate is used to accommodate a phase change liquid, and the internal flow channel is inclined upward toward the hot end side of the liquid cooling plate. Based on the combination of the condenser and the liquid cooling plate, a gas-liquid phase change self-circulation structure is formed, which is convenient for cooling the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery cooling, and more specifically, to a gas-liquid phase change cooling device for a battery. Background Art

[0002] Electrochemical energy storage includes lithium iron phosphate batteries, lead-acid lead-carbon batteries, etc. Thermal management technology is an indispensable part of the electrochemical energy storage system, and it is one of the key technologies to ensure the normal operation and lifespan of the battery. The current thermal management technologies include air cooling, liquid cooling (liquid cooling plate and immersion), heat pipe cooling, and phase change cooling (gas-liquid phase change and solid-liquid phase change). Among them, air cooling and liquid cooling are the mainstream cooling methods.

[0003] Air cooling: The temperature of the battery is reduced through the forced convection heat transfer of air. It has a simple structure, is easy to maintain, and has a low cost, but has a high temperature rise and poor temperature uniformity, and is suitable for occasions with a low heat generation rate.

[0004] Liquid cooling plate liquid cooling: The temperature of the battery is reduced through the convective heat transfer of the liquid (a mixture of water and ethylene glycol) in the internal flow channel of the cold plate in contact with the battery. The heat dissipation effect is better than that of air cooling, but there is a risk that once the conductive cooling liquid leaks, it will cause the battery to short-circuit; Immersion liquid cooling: An insulating liquid is introduced into the battery module, and the liquid is in direct contact with the battery surface, and cools the battery in the form of single-phase convective heat transfer under the action of a circulation pump. The cooling effect is relatively good, but the cost is too high and it is not suitable for lead-acid lead-carbon batteries that generate hydrogen.

[0005] The heat pipe absorbs heat through the evaporation of the medium in the heat pipe; Gas-liquid phase change cooling uses the principle of liquid heat transfer through gas-liquid phase change to cool the heating components, which is efficient, economical, and has a good cooling effect. However, these two cooling technologies are not yet mature and have less market applications. Summary of the Invention

[0006] The object of the present invention: In order to overcome the defects of the prior art, the present invention provides a gas-liquid phase change cooling device for a battery, which forms a gas-liquid phase change self-circulation structure based on the combination of a condenser and a liquid cooling plate, facilitating the cooling of the battery.

[0007] The technical solution of the present invention: A gas-liquid phase change cooling device for a battery includes a liquid cooling layer composed of a plurality of liquid cooling plates arranged side by side. A placement area for accommodating a row of batteries is vacated between adjacent two liquid cooling plates and can form an abutment with the two side contact surfaces of the battery. Each liquid cooling plate has an internal flow channel, as well as a hot end and a cold end located at both ends. It further includes a condenser. The liquid cooling plate is connected to the condenser to form a phase change cooling loop. The internal flow channel of the liquid cooling plate is used to accommodate the phase change liquid, and the internal flow channel is inclined upward towards the hot end side of the liquid cooling plate.

[0008] By adopting the above technical solution, based on the combination of a condenser and a liquid cooling plate, a gas-liquid phase change self-circulation structure is formed, which is convenient for cooling the battery. During use, the liquid cooling plate contacts the battery to absorb heat. The liquid with a lower boiling point in its internal flow channel absorbs heat and undergoes a phase change to become a gas-liquid two-phase mixture. Based on the principle of thermomechanical conversion, the heat gives the gas-liquid two-phase mixture the power to move towards the hot end. Specifically, there is a density difference between the gas-liquid two-phase mixture and the liquid in the internal flow channel (the density of the gas-liquid mixture is small and the density of the liquid is large), and then a pressure difference is formed. This pressure difference will push the gas-liquid two-phase mixture to enter from the inlet of the condenser and be condensed into a liquid in the condenser. The condensed liquid is discharged from the outlet of the condenser into the liquid cooling plate, thus realizing a self-circulation without pump drive. The inclined internal flow channel facilitates the flow of the gas-liquid two-phase mixture towards the hot end side. The phase change liquid has high insulation performance and the function of extinguishing fire and arc, has no short-circuit risk, high energy density, good cooling effect, long service life, controllable cost, and can support the efficient operation of the energy storage battery system.

[0009] Preferably, the plate width of the liquid cooling plate is smaller than the height of the contact surface of the battery, and contact is formed at the middle part of the contact surface between the liquid cooling plate and the battery. This patent mainly aims at lead-acid lead-carbon batteries. Since lead-acid lead-carbon batteries have the characteristics of high heat in the middle and low heat at the upper and lower ends, it is not necessary for the liquid cooling plate to completely cover the side of the battery. By forming contact at the middle part of the contact surface between the liquid cooling plate and the battery, the cost of the liquid cooling plate can be reduced.

[0010] Preferably, a heat conducting plate is additionally provided on the upper and / or lower surface of the liquid cooling plate, and the heat conducting plate can form an abutment with the upper or lower part of the contact surface of the battery. The heat conducting plate conducts heat in contact with the liquid cooling plate, and forms an abutment with the upper or lower part of the contact surface of the battery, increasing the contact area with the battery to achieve a good cooling and heat dissipation effect. It can be applied to the heat dissipation of lithium batteries with uniform heat generation.

[0011] Preferably, the liquid cooling plate is inclined upward towards its hot end side, the heat conducting plate is arranged on the upper surface of the liquid cooling plate, and its plate width gradually decreases from the cold end of the liquid cooling plate to the hot end side. The heat conductivity of the heat conducting plate made of solid aluminum alloy is inferior to that of the liquid cooling plate, and there is a certain temperature difference between the two. The reason is that the equivalent thermal conductivity formed by the convection of single-phase liquid and gas-liquid two-phase mixture inside the liquid cooling plate is much higher than the thermal conductivity of aluminum alloy. The inherent characteristics of the convective heat transfer of the liquid cooling plate itself will cause a temperature difference along the liquid cooling plate: specifically, the temperature at the hot end is slightly higher than that at the cold end, and the heat conducting plate is close to the cold end of the liquid cooling plate. Using the heat conducting plate made of solid aluminum alloy, due to its pure heat conduction and heat transfer form, it can improve the average temperature at the cold end to a certain extent, thereby reducing the temperature difference between the hot end and the cold end of the liquid cooling plate, facilitating the balance of the temperatures at both ends of the battery, enabling the temperature rise of each battery to be relatively close, and being beneficial to the efficient operation of the battery.

[0012] Preferably, the condenser is also connected to a chiller or a water cooler, and the switching action or the water flow rate of the chiller or the water cooler can be regulated. The combination of the condenser and the liquid cooling plate forms a phase change cooling circuit as the primary cooling structure; the condenser is also secondarily cooled by the cooling water provided by the chiller or the water cooler, and the heat absorbed by the battery through the liquid-gas phase change process of the phase change liquid is transferred to the external environment. The primary and secondary cooling can form a complete battery thermal management system, providing good heat dissipation conditions for the battery and ensuring that the battery is at an appropriate working temperature. The primary and secondary cooling structures can be independently manufactured, with high production efficiency and low cost.

[0013] Preferably, a cooling module is composed of a plurality of liquid cooling layers and a plurality of condensers that are spaced apart in the vertical direction, and the condensers of the plurality of cooling modules are connected in parallel or in series; the battery is square, and the contact surface in contact with the liquid cooling plate is a wide surface. The cooling module is an independent self-circulating cooling system, and any problem with one of the cooling modules does not affect the normal operation of other cooling modules; the narrow surfaces of the plurality of square batteries are relatively close to each other, and the contact surface in contact with the liquid cooling plate is a wide surface, so as to increase the contact area with the liquid cooling plate as much as possible. Since the heat generation of the battery is small, the heat flux density of its wide surface is small, and the temperature difference at both ends of the plate length of the liquid cooling plate during the liquid-gas phase change process is small, thus achieving a better cooling effect.

[0014] Preferably, when a condenser is provided in each of the plurality of liquid cooling layers, the hot ends of the plurality of liquid cooling plates in each liquid cooling layer are also connected in communication to form a hot end integration.

[0015] And when the cold ends of the plurality of liquid cooling plates in each liquid cooling layer are connected in communication to form a cold end integration, the hot end integration of the liquid cooling layer is directly or indirectly connected to the inlet of the corresponding condenser, and the cold end integration is directly or indirectly connected to the outlet of the corresponding condenser to form the cooling circuit described above;

[0016] Or when the cold ends of the plurality of liquid cooling plates in each liquid cooling layer are independently separated, the upper part of the hot end integration of the liquid cooling layer is connected to the inlet of the corresponding condenser, and the lower part of its hot end integration is connected to the outlet of the corresponding condenser to form the cooling circuit described above. The upper part of the hot end integration facilitates the upward movement of the gas-liquid mixture into the condenser, and its lower part facilitates the reflux of the condensed liquid; and since the cold ends of the plurality of liquid cooling plates are independently separated, the liquid cooling plates can undergo a certain amount of flexible deformation, thus facilitating the installation of the battery.

[0017] Preferably, the condenser and the corresponding liquid cooling layer are separately arranged and are also connected in communication through a pipeline; or the condenser is a hot end integration, and it is directly installed on the liquid cooling layer to connect the hot ends of the plurality of liquid cooling plates in each liquid cooling layer in communication.

[0018] Preferably, when each of the multiple liquid cooling plates is equipped with a condenser, in each liquid cooling layer: the hot ends of the liquid cooling plates are disconnected from each other, and the cold ends are also disconnected from each other. The hot end and the cold end of the liquid cooling plate are respectively connected to the inlet and outlet of the corresponding condenser to form the cooling circuit described above, and the multiple condensers are connected in series or in parallel. Each liquid cooling plate is independent, which facilitates a certain flexible deformation of the liquid cooling plate and better installation of the battery. Description of the Drawings

[0019] Figure 1 This is the structural diagram of the battery installed in the first specific embodiment of the present invention, where h1 is the plate width of the liquid cooling plate and h2 is the contact surface height of the battery.

[0020] Figure 2 This is the structural diagram of the first specific embodiment of the present invention without the battery installed.

[0021] Figure 3 This is the schematic diagram of the phase change cooling circuit of the first specific embodiment of the present invention, where arrow a is the flow direction of the fluid inside the liquid cooling plate, arrow b is the flow direction of the gas-liquid two-phase mixture in the exhaust pipe, and the flow direction of the condensed liquid in the return pipe.

[0022] Figure 4 This is the structural diagram of the battery installed in the second specific embodiment of the present invention.

[0023] Figure 5 This is the structural diagram of the second specific embodiment of the present invention without the battery installed.

[0024] Figure 6 This is the structural diagram of the battery installed in the third specific embodiment of the present invention.

[0025] Figure 7 This is the structural diagram of the third specific embodiment of the present invention without the battery installed.

[0026] Figure 8 This is the structural diagram of the battery installed in the fourth specific embodiment of the present invention.

[0027] Figure 9 This is the structural diagram of the fourth specific embodiment of the present invention without the battery installed.

[0028] Figure 10 This is the structural diagram of the battery installed in the fifth specific embodiment of the present invention.

[0029] Figure 11 This is the structural diagram of the fifth specific embodiment of the present invention without the battery installed.

[0030] In the figure: liquid cooling layer A, cooling module B, liquid cooling plate 1, placement area 11, hot end integration 1a, cold end integration 1b, battery C, contact surface C1, condenser 2, heat conducting plate 3, exhaust pipe 12, return pipe 13. Detailed Description of the Invention

[0031] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0032] As Figures 1-11 shown, a gas-liquid phase change cooling device for a battery of the present invention includes a liquid cooling layer A composed of a plurality of liquid cooling plates 1 arranged side by side. A placement area 11 for accommodating a row of batteries is left between adjacent two liquid cooling plates 1, and can form an abutment with the two contact surfaces C1 on both sides of the battery C. Each liquid cooling plate 1 has an internal flow channel, as well as a hot end and a cold end at both ends. It further includes a condenser 2. The liquid cooling plate 1 is communicated with the condenser 2 to form a phase change cooling loop. The internal flow channel of the liquid cooling plate 1 is used to accommodate the phase change liquid, and the internal flow channel is inclined upward toward the hot end side of the liquid cooling plate 1. The condenser 2 is provided with an exhaust valve.

[0033] Specifically, the plate width of the liquid cooling plate 1 is smaller than the height of the contact surface of the battery, and contact is formed at the middle part of the contact surface between the liquid cooling plate 1 and the battery. A heat conducting plate 3 is additionally provided on the upper surface and / or the lower surface of the liquid cooling plate 1, and the heat conducting plate 3 can form an abutment with the upper part or the lower part of the contact surface of the battery. The liquid cooling plate 1 is inclined upward toward its hot end side, which can make the internal flow channel form an upward inclination accordingly. Of course, it can also be that the liquid cooling plate 1 is horizontally arranged, while the internal flow channel is inclined relative to the liquid cooling plate 1. The heat conducting plate 3 is arranged on the upper surface of the liquid cooling plate 1, and its plate width gradually decreases from the cold end to the hot end side of the liquid cooling plate 1. The heat conducting plate is welded to the liquid cooling plate as a whole. The inclination angle of the liquid cooling plate 1 is 2-3°.

[0034] Of course, the plate width of the liquid cooling plate 1 can also be equal to or greater than the height of the contact surface of the battery, and the liquid cooling plate 1 forms a full contact with the contact surface of the battery and the heat conducting plate is cancelled.

[0035] Specifically, the condenser 2 is further connected to a chiller or a water cooler, and the switching action or the water flow rate of the chiller or the water cooler can be regulated. The chiller or the water cooler is an existing technology, so there is no need to specifically describe it again.

[0036] Specifically, a cooling module B is composed of a plurality of liquid cooling layers A and a plurality of condensers 2 spaced apart in the up and down directions. The condensers 2 of the plurality of cooling modules B are in parallel or in series; the battery is square, and the contact surface in contact with the liquid cooling plate 1 is the wide surface. A plurality of batteries are connected by electrodes.

[0037] The liquid cooling layer and the battery can be installed in the box through fixing parts such as bolts. During installation, the thermal conductive silicone pad is first adhered to the liquid cooling plate, and then a row of batteries with electrodes already connected is installed in the placement area between the two liquid cooling plates by a manipulator, and the batteries are fixed with bolts to prevent front-back and up-down movement.

[0038] Based on the combination of a condenser and a liquid cooling plate, the present invention forms a gas-liquid phase change self-circulation structure, which is convenient for cooling the battery. During use, the liquid cooling plate contacts the battery to absorb heat, and the liquid with a lower boiling point in its internal flow channel absorbs heat and undergoes a phase change to become a gas-liquid two-phase mixture. Under the action of the heat-work conversion principle, the heat makes the gas-liquid two-phase mixture have the power to move towards the hot end. Specifically: there is a density difference between the gas-liquid two-phase mixture and the liquid in the internal flow channel (the density of the gas-liquid mixture is small and the density of the liquid is large), and then a pressure difference is formed. This pressure difference will push the gas-liquid two-phase mixture to move in the internal flow channel and enter through the inlet of the condenser, and is condensed by the condenser into a liquid. The condensed liquid is discharged from the outlet of the condenser into the liquid cooling plate, thus realizing a self-circulation without pump drive. The phase change liquid is a fluorocarbon compound, which has good insulation performance, low viscosity and is easy to flow, and its boiling point is between 30-50°C. By controlling the internal pressure, the boiling point of the liquid can be controlled, so that the liquid cooling plate has a lower temperature and ensures that the battery operates within a suitable temperature range. The gas-liquid phase change cooling technology uses a liquid with high insulation, appropriate boiling point, environmental protection and safety to cool the heating components through the principle of gas-liquid phase change heat transfer. It is a new type of efficient and economical cooling technology with good cooling effect and fire prevention and arc extinguishing characteristics.

[0039] The combination of the condenser and the liquid cooling plate forms a phase change cooling circuit as the primary cooling structure; the condenser is also secondarily cooled by the cooling water provided by a chiller or a water cooler, and the heat absorbed by the battery through the gas-liquid phase change process of the phase change liquid is transferred to the external environment. The primary and secondary cooling can form a complete battery thermal management system, providing good heat dissipation conditions for the battery and ensuring that the battery is at a suitable operating temperature. The primary and secondary cooling structures can be independently manufactured, with high production efficiency and low cost. And each cooling module is an independent self-circulation cooling system. If any one of the cooling modules has a problem, it does not affect the normal operation of other cooling modules; the narrow sides of multiple square batteries are relatively close to each other, and the contact surface in contact with the liquid cooling plate is the wide side, and the contact area with the liquid cooling plate is increased as much as possible. Since the heat generation of the battery is small, the heat flux density of its wide side is small.

[0040] This patent mainly focuses on lead-acid lead-carbon batteries. Since lead-acid lead-carbon batteries have the characteristics of high heat in the middle and low heat at the upper and lower ends, it is not necessary for the liquid cooling plate to completely cover the side of the battery. By forming contact in the middle part of the contact surface between the liquid cooling plate and the battery, the cost of the liquid cooling plate can be reduced; the heat conducting plate conducts heat with the liquid cooling plate, and the heat conducting plate also forms an abutment with the upper or lower part of the contact surface of the battery, increasing the contact area with the battery to achieve a good cooling and heat dissipation effect, so that it can also be applied to the heat dissipation of lithium batteries with uniform heat generation. The heat conducting plate is close to the cold end of the liquid cooling plate. Using the pure heat conduction and heat exchange form of the heat conducting plate can improve the average temperature of the cold end to a certain extent, thereby reducing the temperature difference between the hot end and the cold end of the liquid cooling plate, facilitating the balance of the temperatures at both ends of the battery, enabling the temperature rise of each battery to be relatively close, and being beneficial to the efficient operation of the battery.

[0041] Specific embodiment 1 of the phase change cooling circuit (such as Figures 1-3 ), when each of the multiple liquid cooling layers A is equipped with a condenser 2, the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are also connected in communication as a hot end integration 1a, and the cold ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are connected in communication as a cold end integration 1b. The hot end integration 1a of the liquid cooling layer A is directly or indirectly connected to the inlet of the corresponding condenser 2, and the cold end integration 1b is directly or indirectly connected to the outlet of the corresponding condenser 2, thereby forming the described cooling circuit; the condenser 2 and the corresponding liquid cooling layer A are separately arranged, and both ends of the condenser 2 are also respectively connected in communication with the hot end integration 1a and the cold end integration 1b through pipelines. The pipelines are divided into an exhaust pipe 12 and a return pipe 13. The exhaust pipe 12 connects the hot end integration 1a and the inlet of the condenser 2, and the return pipe 13 connects the cold end integration 1b and the outlet of the condenser 2.

[0042] Specific embodiment 2 of the phase change cooling circuit (such as Figure 4 , 5 ), when each of the multiple liquid cooling layers A is equipped with a condenser 2, the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are also connected in communication as a hot end integration 1a, and when the cold ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are independently separated, the upper part of the hot end integration 1a of the liquid cooling layer A is connected to the inlet of the corresponding condenser 2, and the lower part of its hot end integration 1a is connected to the outlet of the corresponding condenser 2, thereby forming the described cooling circuit; the condenser 2 and the corresponding liquid cooling layer A are separately arranged, and the condenser 2 is also respectively connected in communication with the upper and lower parts of the hot end integration 1a through pipelines. The pipelines are divided into an exhaust pipe 12 and a return pipe 13. The exhaust pipe 12 connects the upper part of the hot end integration 1a and the inlet of the condenser 2, and the return pipe 13 connects the lower part of the hot end integration 1a and the outlet of the condenser 2.

[0043] For the aforementioned specific embodiments 1 and 2, after installing the liquid cooling layer and the battery into the box, install the condenser on the top of the box, connect it to the liquid cooling layer A through pipelines respectively, and finally pour the phase change liquid and not lower than the top of the hot end integration 1a.

[0044] Specific Embodiment 3 of the phase change cooling circuit (such as Figure 6 , 7 ), when each of the multiple liquid cooling layers A is equipped with a condenser 2, the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are also connected to form a hot end integration 1a, and the cold ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are connected to form a cold end integration 1b. The hot end integration 1a of the liquid cooling layer A is directly or indirectly connected to the inlet of the corresponding condenser 2, and the cold end integration 1b is directly or indirectly connected to the outlet of the corresponding condenser 2 to form the cooling circuit; the condenser 2 is a hot end integration, which is directly installed on the liquid cooling layer A to connect the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A, and the condensers 2 of each layer are also connected through pipelines.

[0045] Specific Embodiment 4 of the phase change cooling circuit (such as Figure 8 , 9 ), when each of the multiple liquid cooling layers A is equipped with a condenser 2, the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are also connected to form a hot end integration 1a, and when the cold ends of the multiple liquid cooling plates 1 in each liquid cooling layer A are independently separated, the upper part of the hot end integration 1a of the liquid cooling layer A is connected to the inlet of the corresponding condenser 2, and the lower part of its hot end integration 1a is connected to the outlet of the corresponding condenser 2 to form the cooling circuit; the condenser 2 and the corresponding liquid cooling layer A are separately arranged, and the condenser 2 is also respectively connected to the upper part and the lower part of the hot end integration 1a through pipelines; the condenser 2 is a hot end integration, which is directly installed on the liquid cooling layer A to connect the hot ends of the multiple liquid cooling plates 1 in each liquid cooling layer A, and the condensers 2 of each layer are also connected through pipelines.

[0046] Specific Embodiment 5 of the phase change cooling circuit (such as Figure 10 , 11 ), when each of the multiple liquid cooling plates 1 is equipped with a condenser 2, in each liquid cooling layer A: the hot ends of the liquid cooling plates 1 are disconnected from each other, and the cold ends are also disconnected from each other. The hot ends and cold ends of the liquid cooling plates 1 are respectively connected to the inlet and outlet of the corresponding condenser 2 to form the cooling circuit, and the multiple condensers 2 are connected in series or in parallel through pipelines to the integrated outlet pipe and the integrated return pipe. The condenser integrated outlet pipe of one cooling module B can be connected to the condenser integrated return pipe of the next cooling module B. The integrated outlet pipe is used for discharging substances, and the integrated return pipe is used for substance reflux.

[0047] The hot ends and cold ends of the liquid cooling plate 1 are provided with openings.

[0048] It should be noted that in the description of the present invention, all directional indications (such as up, down, front, back...) are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture (as shown in the drawings). If this specific posture changes, the directional indications will also change accordingly.

[0049] In addition, in the present invention, descriptions such as "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "several" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In the description of the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "connected", "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A gas-liquid phase change cooling device for a battery, comprising a liquid cooling layer (A) formed by a plurality of liquid cooling plates (1) arranged side by side, a placement area (11) for accommodating a row of batteries being left between two adjacent liquid cooling plates (1) and being able to form abutment with contact surfaces on both sides of the batteries, each liquid cooling plate (1) having an internal flow channel and a hot end and a cold end at both ends, characterized in that: It also includes a condenser (2), the liquid cooling plate (1) being connected to the condenser (2) to form a phase change cooling circuit, the internal flow channel of the liquid cooling plate (1) being used to contain the phase change liquid, the internal flow channel being arranged to be inclined upwards toward the hot end side of the liquid cooling plate (1); The width of the liquid cooling plate (1) is smaller than the height of the contact surface of the battery, and the liquid cooling plate (1) forms contact with the middle portion of the contact surface of the battery; A heat conducting plate (3) is provided on the upper side and / or the lower side of the liquid cooling plate (1), and the heat conducting plate (3) can abut against the upper side or the lower side of the contact surface of the battery; The liquid cooling plate (1) is arranged upwardly and tilted toward its hot end, and the heat conducting plate (3) is arranged on the top of the liquid cooling plate (1), and its plate width gradually decreases from the cold end to the hot end of the liquid cooling plate (1).

2. The gas-liquid phase change cooling device for a battery according to claim 1, characterized in that: The condenser (2) is also connected to a chiller or a water cooler, and the switching action or water flow rate of the chiller or the water cooler can be adjusted.

3. The gas-liquid phase change cooling device for a battery according to claim 1, characterized in that: A cooling module (B) is composed of a plurality of liquid cooling layers (A) and a plurality of condensers (2) spaced apart in the vertical direction, wherein the condensers (2) of the plurality of cooling modules (B) are connected in parallel or in series; the battery is square and has a wide contact surface with the liquid cooling plate (1).

4. The gas-liquid phase change cooling device for a battery according to claim 1, characterized in that: When each of the plurality of liquid cooling layers (A) is provided with a condenser (2), the hot ends of the plurality of liquid cooling plates (1) in each liquid cooling layer (A) are further connected to form a hot end assembly (1a). When the cold ends of the plurality of liquid cooling plates (1) in each liquid cooling layer (A) are connected to form a cold end integration (1b), the hot end integration (1a) of the liquid cooling layer (A) is directly or indirectly connected to the inlet of the corresponding condenser (2), and the cold end integration (1b) is directly or indirectly connected to the outlet of the corresponding condenser (2), thereby forming the cooling circuit; Alternatively, when the cold ends of the plurality of liquid cooling plates (1) in each liquid cooling layer (A) are independently separated, the upper part of the hot end integration (1a) of the liquid cooling layer (A) is connected to the inlet of the corresponding condenser (2), and the lower part of the hot end integration (1a) is connected to the outlet of the corresponding condenser (2), thereby forming the cooling circuit.

5. The gas-liquid phase change cooling device for a battery according to claim 4, characterized in that: The condenser (2) and the corresponding liquid cooling layer (A) are arranged separately and are also connected through a pipeline; or the condenser (2) is hot end integrated and is directly installed on the liquid cooling layer (A) to connect the hot ends of multiple liquid cooling plates (1) in each liquid cooling layer (A).

6. The gas-liquid phase change cooling device for a battery according to claim 1, characterized in that: When the plurality of liquid cooling plates (1) are each equipped with a condenser (2), In each liquid cooling layer (A), the hot ends of the liquid cooling plates (1) are disconnected from each other, and the cold ends are also disconnected from each other. The hot end and the cold end of the liquid cooling plate (1) are respectively connected to the inlet and outlet of the corresponding condenser (2) to form the cooling circuit. The multiple condensers (2) are connected in series or in parallel.

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