Heat guide plate device for heat management of battery pack

Abstract

The utility model discloses a heat guide plate device for heat management of a battery pack, which comprises a liquid cooling plate, a heat dissipation plate is mounted on the liquid cooling plate, and a battery cell is tightly embedded in the middle of the heat dissipation plate; a phase change working medium is arranged in the heat dissipation plate and is used for transferring heat at the battery cell to the liquid cooling plate; and the upper end of the liquid cooling plate is also provided with a battery pack shell which is hermetically buckled with the liquid cooling plate up and down. And liquid cooling plate connecting pipes are arranged in the liquid cooling plate and are used for carrying out heat dissipation treatment on the liquid cooling plate. Due to the fact that the welding technology is mature, the heat dissipation aluminum plate is high in manufacturability, and the leakage risk of the phase change materials contained in the heat dissipation aluminum plate is small. The heat exchange operation of the battery cell is realized by adopting the phase change material, the gas-liquid phase change makes up the defect of poor heat-conducting property of the traditional solid-liquid phase change, and the battery cell can work in a proper temperature range for a long time due to the high phase change heat exchange coefficient, the heat exchange efficiency is increased, the heat is taken away in time and the temperature of the battery cell is effectively controlled.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack auxiliary structures, and particularly relates to a heat conduction plate device for battery pack thermal management. Background Technique

[0002] A battery pack refers to a combination of multiple bundled and fixed battery cells. Heat is generated during the charging and discharging processes of the battery pack. If this part of the heat cannot be quickly discharged, the battery pack will be in a relatively high-temperature environment for a long time. To a certain extent, it will reduce the performance of the battery and shorten the battery life. In severe cases, it will cause the battery pack to explode and trigger a fire due to heat accumulation.

[0003] In the prior art for cylindrical batteries, the heat exchange area where the evaporation section fits the battery is limited, and the process requirements are high, which easily causes the evaporation section to be not firmly attached to the battery cell; and mostly uses air cooling for heat dissipation in the condensation section, with low heat exchange efficiency; and a wind duct needs to be set up, with a complex design; the connection between the heat sink and the air-cooled box unit is complex, with high process requirements and many splicing structures, which easily causes air volume leakage and low heat exchange efficiency.

[0004] Therefore, aiming at the problem of poor heat dissipation during the operation of the battery pack in the prior art, it is urgent to design a battery pack auxiliary structure to quickly dissipate the heat generated during the operation of the battery pack. Content of the Utility Model

[0005] The purpose of the utility model is to provide a heat conduction plate device for battery pack thermal management to solve the problems put forward in the above background technique. The following technical solutions are provided: A heat conduction plate device for battery pack thermal management, including:

[0006] A liquid cooling plate, on which a heat dissipation plate is installed. The heat dissipation plates are evenly arranged at the upper end of the liquid cooling plate, and the lower ends of each heat dissipation plate are always in close contact with the upper end surface of the liquid cooling plate. A battery cell is tightly embedded in the middle of the heat dissipation plate; a phase change working medium is arranged inside the heat dissipation plate, and the phase change working medium is used to transfer the heat at the battery cell to the liquid cooling plate; a battery pack housing that is hermetically buckled with the liquid cooling plate up and down is also arranged at the upper end of the liquid cooling plate.

[0007] Liquid cooling plate pipes are arranged inside the liquid cooling plate, and both ends of the liquid cooling plate pipes are respectively connected to an external cold liquid system for heat dissipation treatment of the liquid cooling plate.

[0008] In this technical solution, the heat dissipation plate uses a heat dissipation aluminum plate containing a phase change working medium. The aluminum plate is L-bent to fit the battery cell, and the heat dissipation plate is made by a welding process, with a simple process and a small risk of leakage of the internal medium.

[0009] During normal operation of the battery cell, the battery temperature continues to rise and exchanges heat with the heat sink containing the phase change fluid. When the temperature reaches the phase change temperature of the phase change fluid, the phase change fluid absorbs the heat generated by the battery cell and changes from liquid to gas. Since the density of the gas state is less than that of the liquid state, the gas circulates upward along the heat sink and finally contacts the liquid cooling plate under the heat sink to condense into liquid again, thereby transferring the heat from the battery cell to the liquid cooling plate through the heat sink.

[0010] The liquid cooling plate pipe is divided into an inlet pipe and an outlet pipe, which are respectively connected to the external liquid cooling system to form a refrigeration cycle loop. The battery cell can be quickly cooled by connecting the liquid cooling plate pipe to the external cold liquid system.

[0011] In any of the above technical solutions, further, the heat sink is L-shaped and includes a cover plate, a flow channel plate is provided on one side of the cover plate, and a cavity-shaped cover plate liquid storage area is provided inside the cover plate.

[0012] The interior of the flow plate is provided with a cavity-shaped flow plate gas-liquid mixing area and a flow plate evaporation area, which surround the flow plate evaporation area on both sides, and the flow plate gas-liquid mixing area and the flow plate evaporation area are respectively connected with the cover plate liquid storage area to form a closed chamber.

[0013] The evaporation area of ​​the flow channel plate is also evenly provided with staggered protrusions, which are used to increase the turbulence of the gas. The cover plate and the flow channel plate are made of heat dissipation aluminum.

[0014] In the present technical solution, staggered protrusions are respectively designed inside the evaporation zone of the flow channel plate, which can increase gas disturbance, prevent gas-liquid separation, and further improve heat exchange efficiency. The battery cell is in a rectangular block shape, and the area of ​​the evaporation zone of the flow channel plate is the same as the area of ​​the large surface of the battery cell; a cover plate liquid storage area with a cavity is designed in the cover plate, which coincides with the battery cell, is conducive to heat exchange with the liquid cooling plate and facilitates liquid deposition; since the area of ​​the heat sink containing the phase change medium is larger than the area of ​​the battery cell, the temperature of the area not covered by the battery (the gas-liquid mixing area of ​​the flow channel plate) is relatively low, and the temperature in the gas-liquid mixing area of ​​the flow channel plate continues to decrease as the fluid flows. When a part of the gaseous phase change medium flows through this area, the temperature of this area is lower than the phase change temperature of the phase change medium. The gaseous phase change medium undergoes a phase change and becomes liquid. When it flows to the lower side of the heat sink, it exchanges heat with the liquid cooling plate, and the liquid cooling plate takes away the heat for continuous recycling.

[0015] The bottom of the heat sink containing phase change fluid is L-shaped, which is convenient for positioning the battery cells. The area of ​​the liquid storage area of ​​the cover is the same as the area of ​​the bottom of the battery cells, which makes the battery cells more compact. The L-shaped bend is located between the bottom of the battery cells and the upper part of the liquid cooling plate. Thermally conductive glue with strong bonding strength is applied to the contact surface between the battery cells and the heat sink, which facilitates the good transfer of heat generated by the battery cells to the heat sink.

[0016] In any of the above technical solutions, further, the phase change working fluid is separately and hermetically arranged in the liquid storage area of the cover plate, the gas-liquid mixing area of the flow channel plate, and the evaporation area of the flow channel plate. The phase change working fluid is in a liquid state, a gas-liquid coexistence state, and a gaseous state in the liquid storage area of the cover plate, the gas-liquid mixing area of the flow channel plate, and the evaporation area of the flow channel plate, respectively.

[0017] In this technical solution, it should be noted that the phase change working fluid in this application is composed of one or more of water, chloroperfluorocyclobutane, 1,1,2-trichloro-1,2,2-trifluoroethane, benzene, cyclohexane, decane, ethanol, n-hexane, methanol, and toluene configured in a certain proportion, and the phase change temperature of the phase change working fluid is 40 °C. The gas-liquid phase change of the phase change working fluid makes up for the defect of poor thermal conductivity of traditional solid-liquid phase change, thereby effectively improving the heat dissipation efficiency of this application.

[0018] The beneficial effects of the present utility model are as follows: This device is easy to manufacture and has a high qualified rate. The heat dissipation plate is made by welding. Since the welding process is mature, the heat dissipation aluminum plate has strong manufacturability, and the risk of leakage of the phase change material contained inside is small. The phase change material is used to realize the heat exchange operation of the battery cell. The gas-liquid phase change makes up for the defect of poor thermal conductivity of traditional solid-liquid phase change. Due to the high phase change heat transfer coefficient, the heat exchange efficiency is increased, the heat is taken away in time, the temperature of the battery cell is effectively controlled, and the battery cell can work within a suitable temperature range for a long time.

[0019] In an energy storage system with the increasing energy density of the battery pack, the phase change cooling can meet the heat dissipation requirements of large-capacity battery cells. The whole device only adds the phase change working fluid without adding other components additionally. Compared with the traditional direct cooling technology, there is no complex direct cooling system and no need to be equipped with direct cooling pipelines, reducing the risk of refrigerant leakage. The water cooling system is still used to take away the heat, which can effectively reduce the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic internal structure diagram of the present utility model;

[0021] Figure 2 is a schematic external view of the present utility model;

[0022] Figure 3 is a schematic external view of the heat dissipation plate in the present utility model;

[0023] Figure 4 is a schematic internal structure diagram of the heat dissipation plate in the present utility model.

[0024] The reference numerals in the drawings are: 100, liquid cooling plate; 101, liquid cooling plate connection pipe; 200, heat dissipation plate; 201, cover plate; 202, flow channel plate; 201A, liquid storage area of the cover plate; 202B, gas-liquid mixing area of the flow channel plate; 202C, evaporation area of the flow channel plate; 203, offset protrusion; 300, battery cell; 400, battery pack housing; 500, phase change working fluid. Detailed implementation manners

[0025] The following will clearly describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary embodiments according to the present application. For the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0027] Embodiment 1:

[0028] As Figure 1-2 shown, this embodiment provides a heat conduction plate device for battery pack thermal management, including:

[0029] A liquid cooling plate 100, on which a heat dissipation plate 200 is installed. The heat dissipation plates 200 are evenly arranged at the upper end of the liquid cooling plate 100, and the lower ends of the heat dissipation plates 200 are always in close contact with the upper end surface of the liquid cooling plate 100. A battery cell 300 is tightly embedded in the middle of the heat dissipation plate 200; a phase change working medium 500 is provided inside the heat dissipation plate 200, and the phase change working medium 500 is used to transfer the heat at the battery cell 300 to the liquid cooling plate 100; a battery pack housing 400 that is hermetically buckled with the liquid cooling plate 100 up and down is further provided at the upper end of the liquid cooling plate 100.

[0030] Liquid cooling plate pipes 101 are arranged inside the liquid cooling plate 100, and both ends of the liquid cooling plate pipes 101 are connected to an external cold liquid system for dissipating heat from the liquid cooling plate 100.

[0031] In this technical solution, the heat dissipation plate 200 is made of an aluminum plate for heat dissipation containing a phase change working medium. The aluminum plate L is bent and attached to the battery cell 300. The heat dissipation plate 200 is made by a welding process, which has a simple process and a small risk of leakage of the internal medium. During the normal operation of the battery cell 300, the battery temperature continuously rises and exchanges heat with the heat dissipation plate 200 containing the phase change working medium 500. When the temperature reaches the phase change temperature of the phase change working medium 500, the phase change working medium 500 absorbs the heat generated by the battery cell and changes from a liquid state to a gaseous state. Since the density of the gas is less than that of the liquid, the gas circulates upward along the inside of the heat dissipation plate 200 and finally contacts the liquid cooling plate 100 below the heat dissipation plate 200 and condenses to form a liquid state again, thereby transferring the heat at the battery cell 300 to the liquid cooling plate 100 through the heat dissipation plate 200.

[0032] The liquid cooling plate connection pipe 101 is divided into an inlet connection pipe and an outlet connection pipe, which are respectively connected to the external liquid cooling system to form a refrigeration cycle loop, and the battery cell 300 is rapidly cooled by connecting an external cold liquid system to the liquid cooling plate connection pipe 101.

[0033] In a preferred embodiment of the present utility model:

[0034] As Figure 3-4 shown, specifically, the heat dissipation plate 200 is in an L shape and the heat dissipation plate 200 includes a cover plate 201. A flow channel plate 202 is arranged on one side of the cover plate 201, and a cavity-shaped cover plate liquid storage area 201A is arranged inside the cover plate 201.

[0035] The inside of the flow channel plate 202 is respectively provided with a cavity-shaped flow channel plate gas-liquid mixing area 202B and a flow channel plate evaporation area 202C. The flow channel plate gas-liquid mixing area 202B surrounds both sides of the flow channel plate evaporation area 202C, and the flow channel plate gas-liquid mixing area 202B and the flow channel plate evaporation area 202C are respectively communicated with the cover plate liquid storage area 201A to form a sealed chamber.

[0036] The flow channel plate evaporation area 202C is also evenly provided with offset protrusions 203, and the offset protrusions 203 are used to increase the disturbance of the gas. The cover plate 201 and the flow channel plate 202 are made of heat dissipation aluminum.

[0037] In this technical solution, design misaligned protrusions 203 are respectively arranged inside the evaporation area 202C of the flow channel plate. The misaligned protrusions 203 can increase gas disturbance, prevent gas-liquid separation, and further improve the heat exchange efficiency. The battery cell 300 is in the shape of a rectangular block, and the area of the evaporation area 202C of the flow channel plate is the same as the area of the large surface of the battery cell 300. A liquid storage area 201A with a cavity is designed in the cover plate 201. This area coincides with the battery cell, which is beneficial for heat exchange with the liquid cooling plate and facilitates liquid deposition. Since the area of the heat dissipation plate 200 containing the phase change working medium 500 is larger than the area of the battery cell 300, the temperature of the area not covered by the battery (the gas-liquid mixing area 202B of the flow channel plate) is relatively low. As the fluid flows in the gas-liquid mixing area 202B of the flow channel plate, the temperature continuously decreases. When a part of the gaseous phase change working medium 500 flows through this area, the temperature of this area is lower than the phase change temperature of the phase change working medium 500, and the gaseous phase change working medium 500 undergoes a phase change and becomes liquid. When it flows to the lower side of the heat dissipation plate 200, it exchanges heat with the liquid cooling plate 100, and the liquid cooling plate 100 takes away the heat and is continuously recycled.

[0038] The bottom of the heat dissipation plate 200 containing the phase change working medium 500 inside presents an L-shaped bend, which is convenient for positioning the battery cell 300. Moreover, the area of the liquid storage area 201A of the cover plate is the same as the bottom area of the battery cell 300, which facilitates more compact stacking of the battery cells. The L-shaped bend is located at the bottom of the battery cell 300 and the upper part of the liquid cooling plate 100. A thermal conductive adhesive with bonding strength is coated on the contact surface between the battery cell 300 and the heat dissipation plate 200, which is convenient for transferring the heat generated at the battery cell 300 to the heat dissipation plate 200 well.

[0039] In a preferred embodiment of the present utility model:

[0040] As Figure 4 shown, the phase change working medium 500 is respectively sealed in the liquid storage area 201A of the cover plate, the gas-liquid mixing area 202B of the flow channel plate, and the evaporation area 202C of the flow channel plate. The phase change working medium 500 is in a liquid state, a gas-liquid coexistence state, and a gaseous state in the liquid storage area 201A of the cover plate, the gas-liquid mixing area 202B of the flow channel plate, and the evaporation area 202C of the flow channel plate respectively. The phase change temperature of the phase change working medium 500 is 40 °C.

[0041] In this technical solution, it should be noted that the phase change working medium 500 in this application is configured by one or more of water, chlorotrifluorocyclobutane, dichlorotrifluoroethane, benzene, cyclohexane, decane, ethanol, n-hexane, methanol, and toluene in a certain proportion, and the phase change temperature of the phase change working medium 500 is 40 °C. The gas-liquid phase change of the phase change working medium 500 makes up for the defect of poor thermal conductivity of traditional solid-liquid phase change, thereby effectively improving the heat dissipation efficiency of this application.

[0042] The embodiments of the present application have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A thermally conductive plate device for thermal management of a battery pack, characterized in that: include: A liquid cooling plate (100), a heat sink (200) being mounted on the liquid cooling plate (100), the heat sinks (200) being evenly arranged on the upper end of the liquid cooling plate (100), and the lower end of each heat sink (200) always being in close contact with the upper end surface of the liquid cooling plate (100), and a battery cell (300) being tightly embedded in the middle of the heat sink (200); a phase change medium (500) being arranged inside the heat sink (200), and the phase change medium (500) being used to transfer heat from the battery cell (300) to the liquid cooling plate (100); and a battery pack housing (400) being sealed and buckled with the liquid cooling plate (100) from top to bottom is also arranged on the upper end of the liquid cooling plate (100).

2. A thermally conductive plate device for thermal management of a battery pack according to claim 1, characterized in that: The liquid cooling plate (100) is internally arranged with a liquid cooling plate connecting pipe (101), and both ends of the liquid cooling plate connecting pipe (101) are respectively connected to an external cooling liquid system for heat dissipation of the liquid cooling plate (100).

3. A thermally conductive plate device for thermal management of a battery pack according to claim 2, characterized in that: The heat dissipation plate (200) is L-shaped in appearance, and comprises a cover plate (201), a flow channel plate (202) is provided on one side of the cover plate (201), and a cavity-shaped cover plate liquid storage area (201A) is provided inside the cover plate (201).

4. The heat conducting plate device for thermal management of a battery pack according to claim 3, characterized in that: The flow channel plate (202) is provided with a cavity-shaped flow channel plate gas-liquid mixing area (202B) and a flow channel plate evaporation area (202C) respectively inside, the flow channel plate gas-liquid mixing area (202B) surrounds the flow channel plate evaporation area (202C) on both sides, and the flow channel plate gas-liquid mixing area (202B) and the flow channel plate evaporation area (202C) are respectively connected to the cover plate liquid storage area (201A) to form a closed chamber.

5. The heat conducting plate device for thermal management of a battery pack according to claim 3, characterized in that: The cover plate (201) and the flow channel plate (202) are made of heat dissipating aluminum.

6. The heat conducting plate device for thermal management of a battery pack according to claim 4, characterized in that: The phase change working medium (500) is respectively sealed and arranged in the cover plate liquid storage area (201A), the flow channel plate gas-liquid mixing area (202B) and the flow channel plate evaporation area (202C); the phase change working medium (500) is respectively in a liquid state, a gas-liquid coexistence state and a gas state in the cover plate liquid storage area (201A), the flow channel plate gas-liquid mixing area (202B) and the flow channel plate evaporation area (202C).

7. A thermally conductive plate device for thermal management of a battery pack according to claim 6, characterized in that: Displaced protrusions (203) are evenly arranged in the evaporation area (202C) of the flow channel plate, and the displaced protrusions (203) are used to increase the turbulence of the gas.

8. The heat conducting plate device for thermal management of a battery pack according to claim 6, characterized in that: The phase change temperature of the phase change working fluid (500) is 40°C.

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