A power battery energy storage thermal management system and method

Abstract

The application discloses a power battery energy storage heat management system and method, which comprises a battery unit, a cooling unit and a heat storage unit. The battery unit comprises a power battery pack, a battery box and a liquid cooling plate. The power battery pack and the liquid cooling plate are arranged in the interior of the battery box, and the liquid cooling plate is arranged below the power battery pack to cool the power battery pack. A temperature sensor is arranged in the interior of the battery box. The water inlet pipe and the water outlet pipe of the liquid cooling plate extend to the exterior of the battery box. The application improves the problems in the prior art, such as the heating equipment is powered by the battery when heating the power battery, the power consumption of the battery is increased, and the driving mileage of the vehicle is greatly reduced. The application has the advantages that the heat generated by the operation of the heating components such as the vehicle motor and the heat generated by the operation of the battery can be recycled and utilized when the heat is cooled, the battery is heated by the recycled heat, and the energy consumption of the battery is reduced.

Description

Technical Field

[0001] This invention relates to the field of power battery thermal management technology, and in particular to a power battery energy storage thermal management system and method. Background Technology

[0002] A power battery generally refers to a battery used to drive an electric motor. Power batteries include lithium batteries, lead-acid batteries, nickel-metal hydride batteries, etc., such as the batteries used to supply power in new energy vehicles.

[0003] In existing technologies, the temperature of the power battery in new energy vehicles affects battery performance. When the power battery temperature is low, the battery capacity decreases and the discharge current is smaller, which can easily cause the vehicle to fail to drive normally. Therefore, it is necessary to heat the power battery in low-temperature environments. In addition, when the vehicle is started and the battery is working, the power battery generates a lot of heat, and the battery pack is in a relatively closed environment, which will cause the battery temperature to rise. Therefore, it is necessary to dissipate heat from the power battery to maintain the optimal operating temperature, so as to improve its operating efficiency and extend the life of the power battery. However, in existing technologies, the battery is generally heated by a high-power heating device, and the heating device is powered by the battery. Therefore, it will increase the battery power consumption and significantly reduce the vehicle's driving range.

[0004] To address the above technical problems, this invention discloses a power battery energy storage thermal management system and method. This invention has the advantages of recovering and utilizing the heat generated by heat-generating components such as vehicle motors and the heat generated by battery operation, thereby heating the power battery with the recovered heat without consuming additional battery power. Compared with the prior art of heating the power battery with high-power heating equipment, it can reduce battery energy consumption. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a power battery energy storage thermal management system and method. This invention addresses the technical problems in the prior art where heating of power batteries generally involves using high-power heating equipment, which is powered by the battery. This increases battery power consumption and significantly reduces vehicle mileage. The invention has the advantages of recovering and utilizing heat generated by heat-generating components such as vehicle motors and batteries during operation, thereby heating the battery with the recovered heat and reducing battery energy consumption.

[0006] The present invention is achieved through the following technical solution: The present invention discloses a power battery energy storage thermal management system, including a battery unit, a cooling unit 1 and a heat storage unit. The battery unit includes a power battery pack, a battery box and a liquid cooling plate. The power battery pack and the liquid cooling plate are both installed inside the battery box, and the liquid cooling plate is located below the power battery pack for heat dissipation. A temperature sensor is also installed inside the battery box. The water inlet pipe and water outlet pipe of the liquid cooling plate extend to the outside of the battery box, and the water inlet pipe and water outlet pipe of the liquid cooling plate are connected to the cooling unit 1 through pipelines. Cooling unit 1 includes cooling tank 1, refrigeration device and piping 1. Cooling tank 1 is used to hold coolant and supply it to liquid cooling plates through piping 1. Refrigeration device is used to cool the hot flow entering cooling tank 1. Piping 1 includes cooling pipe 2 for liquid inlet to liquid cooling plates and cooling pipe 1 for liquid outlet to liquid cooling plates.

[0007] Furthermore, the heat storage unit includes a heat exchanger, a heating liquid tank, and a pipeline. The heat exchanger is located at a cooling pipe and is used to exchange heat with the coolant discharged from the liquid cooling plate. The hot liquid inlet pipe and the hot liquid outlet pipe of the heat exchanger are both connected to the cooling pipe. The cold liquid inlet pipe and the cold liquid outlet pipe of the heat exchanger are respectively connected to the heating liquid tank through the pipeline. The pipeline includes a heating pipe and a heating pipe. The heating pipe is connected to the cold liquid inlet pipe of the heat exchanger, and the heating pipe is connected to the cold liquid outlet pipe of the heat exchanger.

[0008] Furthermore, the heating liquid tank is connected to a storage tank via pipe three, which has a heat preservation function. Pipe three includes an inlet pipe and an outlet pipe. A temperature sensor is also installed inside the heating liquid tank.

[0009] Furthermore, the battery box includes an outer box, an inner box, a mezzanine, and four pipes. The inner box is located inside the outer box, and a mezzanine is provided between the inner wall of the outer box and the outer wall of the inner box. The outer box and the inner box are fixedly connected by a connecting plate. The interior of the mezzanine is connected to the liquid storage tank through four pipes. Four pipes include connecting pipe one and connecting pipe two. An air inlet valve is also provided on the top of the outer wall of the outer box. One of the connecting pipes is connected to a cooling pipe three through a connector, and the cooling pipe three is connected to a cooling tank one. The other end of the connecting pipe four is connected to the cooling tank one through a connector.

[0010] Furthermore, the connection status of the joints at the connection pipe 1 and the cooling pipe 3 is controlled by a valve. The connection pipe 1 is divided into the first pipe and the second pipe through the joint, and the connection pipe 2 is divided into the third pipe and the fourth pipe through the joint. The connection status of the connection pipe 1 and the cooling pipe 3 is configured such that after the connection pipe 1 and the cooling pipe 3 are connected, the valve will close the connection between the first pipe and the second pipe, and the cooling pipe 3 will be connected to the second pipe. After the cooling pipe 4 is connected to the connection pipe 2, the third pipe and the fourth pipe will be closed, and the cooling pipe 4 will be connected to the fourth pipe.

[0011] Furthermore, the liquid storage tank is also connected to a second cooling unit and a second heating liquid tank. The second cooling unit has the same structure as the first cooling unit. The cooling tank in the second cooling unit is connected to the heating unit through a pipeline. The heat from the heating unit is recovered through a second heat exchanger. The second heat exchanger is connected to the second heating liquid tank through a pipeline. The second heating liquid tank is connected to the liquid storage tank through a pipeline.

[0012] A method for using a power battery energy storage thermal management system includes the following steps: Step 1: When heating the power battery, the valve is controlled to connect the liquid storage tank and the inner layer of the battery pack through connecting pipe 1. The valve is also controlled to connect the liquid storage tank and the inner layer of the battery pack through connecting pipe 2. The pump is started to allow the heating liquid stored in the liquid storage tank to enter the inner layer of the battery pack through connecting pipe 1 and flow back to the liquid storage tank through connecting pipe 2. This allows the heating liquid to flow inside the inner layer of the battery pack, and the internal temperature of the battery pack is raised through heat exchange, thereby heating the power battery pack. Step 2: Monitor the temperature inside the battery box using a temperature sensor. When the temperature inside the battery box reaches the required operating temperature of the power battery pack, shut off the liquid supply to the storage tank. Pump the heating liquid inside the jacket into the storage tank. Control the valves at the connection pipe 1 and the cooling pipe 3 to close the connection between the first and second pipes and connect the second pipe to the cooling pipe 3. Similarly, control the valves at the connection pipe 2 and the cooling pipe 4 to close the connection between the third and fourth pipes and connect the fourth pipe to the cooling pipe 4. Step 3: After the internal temperature of the battery box rises, turn on the pump of Cooling Box 1 to allow coolant to flow out of Cooling Box 1. The coolant inside Cooling Box 1 flows into the flow channel inside the liquid cooling plate through Cooling Pipe 2 and the inlet pipe of the liquid cooling plate. Then, the coolant enters the interior of Cooling Box 1 through the outlet pipe of the liquid cooling plate and Cooling Pipe 1, allowing the coolant to circulate inside the liquid cooling plate and carry away the heat generated by the power battery pack. At the same time, the coolant inside Cooling Box 1 also enters the interlayer through Cooling Pipe 3 via the pump, and then enters the interior of Cooling Box 1 through Cooling Pipe 4, allowing the coolant to flow inside the interlayer. The coolant flowing inside the liquid cooling plate and interlayer dissipates heat from the power battery pack, improving the heat dissipation effect. Step 4: After the heat generated by the power battery pack is carried away by the coolant in the liquid cooling plate, the coolant flows through cooling pipe one into the hot flow channel inside heat exchanger one. At the same time, the heating liquid inside heating tank one flows through heating pipe one into the cold flow inlet pipe inside heat exchanger one. Thus, the heating liquid and coolant exchange heat inside heat exchanger one. After heat exchange, the heating liquid flows through heating pipe two into heating tank one, while the coolant enters the interior of cooling tank one. In this way, the heat exchanger one recovers the heat from the power battery pack, causing the temperature of the heating liquid inside heating tank one to rise. Step 5: When the temperature of the heating fluid reaches the required recovery temperature, stop the heat exchanger 1 and drain the heating fluid in the heating fluid tank 1 into the storage tank for storage, thereby storing the heat. At the same time, the heat generated by the vehicle's motor is dissipated through the cooling unit 2 and the heat from the heating unit is recovered through the heat exchanger 2. After the recovered heating fluid reaches the required temperature, it is drained into the storage tank for storage. Step Six: After shutdown, Cooling Unit One stops supplying liquid, Cooling Unit Two stops supplying liquid, and Cooling Box One extracts the coolant from the interlayer, filling the interlayer with air, which then insulates the power battery pack.

[0013] The present invention has the following advantages: This invention, by incorporating a battery unit, a cooling unit one, a heat storage unit, and a cooling unit two, can simultaneously dissipate heat generated during the operation of the power battery pack and the vehicle's motor, and recover heat. The recovered heating fluid is stored, and when subsequent heating of the power battery pack is needed, the recovered heating fluid flows into the battery box to heat the battery pack, thus eliminating the need for other high-power heating devices, reducing energy consumption of the power battery pack, and preventing impact on vehicle range. Furthermore, by incorporating a battery box and installing [specific features] inside the battery box... The battery pack has a double-layer structure. After the power battery pack stops, the intake valve is activated, and the liquid inside the double-layer is simultaneously pumped out by the pump, filling the double-layer with air. The heat insulation properties of the air give the battery pack walls good heat insulation, preventing the residual heat of the power battery pack from dissipating too quickly. The heat insulation of the battery pack also blocks the low temperature of the outside environment, thereby reducing the power battery pack's losses due to low temperatures. Furthermore, when the power battery pack is operating, filling the double-layer with coolant prevents the heat dissipation effect of the battery pack from being affected by the heat insulation of the battery pack walls. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the power battery energy storage thermal management system of the present invention; Figure 2This is a schematic diagram of the battery box structure of the present invention; Figure 3 This is a schematic diagram of the battery cell of the present invention; Figure 4 This is a schematic diagram of the cooling unit of the present invention; Figure 5 This is a schematic diagram of the thermal storage unit of the present invention; Figure 6 This is a cross-sectional view of the battery box structure of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point A; Figure 8 For the present invention Figure 6 A magnified schematic diagram of the structure at point B.

[0015] In the diagram: 1. Battery unit; 2. Cooling unit one; 3. Heat storage unit; 4. Liquid storage tank; 5. Pipeline three; 6. Connecting plate; 7. Inlet valve; 8. Valve; 9. Cooling pipe three; 10. Cooling pipe four; 11. Cooling unit two; 12. Heating unit; 13. Heated liquid tank two; 14. Heat exchanger two; 101. Power battery pack; 102. Battery box; 103. Liquid cooling plate; 201. Cooling tank one; 202. Refrigeration device; 203. Pipeline one; 23 1. Cooling pipe one; 232. Cooling pipe two; 301. Heat exchanger one; 302. Heated liquid tank one; 303. Pipeline two; 331. Heated pipe one; 332. Heated pipe two; 121. Outer casing; 122. Inner casing; 123. Jacket; 124. Pipeline four; 1241. Connecting pipe one; 1242. Connecting pipe two; 141. First pipe; 142. Second pipe; 143. Third pipe; 144. Fourth pipe; 501. Liquid inlet pipe; 502. Liquid outlet pipe. Detailed Implementation

[0016] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. In the description of the present invention, words such as "front", "rear", "left", and "right" that indicate orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Example

[0017] Example 1 discloses a power battery energy storage thermal management system, such as Figures 1-8 As shown, it includes battery unit 1, cooling unit 2, and heat storage unit 3, wherein, as Figures 1-6As shown, battery unit 1 includes a power battery pack 101, a battery box 102, and a liquid cooling plate 103. The power battery pack 101 is located inside the battery box 102, and the liquid cooling plate 103 is also located inside the battery box 102. The liquid cooling plate 103 is located at the bottom of the battery box 102 and below the power battery pack 101. A temperature sensor is also installed inside the battery box 102 to monitor the internal temperature. The inlet and outlet pipes of the liquid cooling plate 103 extend to the outside of the battery box 102, and the inlet and outlet pipes of the liquid cooling plate 103 are connected to the cooling unit 2 through pipelines. This allows the coolant to flow through the inlet and outlet pipes inside the liquid cooling plate 103 to dissipate heat from the power battery pack 101, thus preventing the power battery pack 101 from operating at excessively high temperatures and affecting its service life. like Figure 1 and Figure 4 As shown, cooling unit 2 includes a cooling tank 201, a refrigeration device 202, and a pipeline 203. The cooling tank 201 is used to hold coolant and supply it to the liquid cooling plate 103 through the pipeline 203. The refrigeration device 202 is used to cool the hot flow entering the cooling tank 201. Specifically, the pipeline 203 includes a cooling pipe 231 and a cooling pipe 232. The cooling pipe 232 is connected to the liquid inlet pipe of the liquid cooling plate 103 through a connector, and the cooling pipe 231 is connected to the liquid outlet pipe of the liquid cooling plate 103 through a connector. Furthermore, the flow of coolant is driven by a pump. Therefore, when the power battery pack 101 needs to be cooled, the pump drives the coolant inside the cooling tank 201 to flow into the flow channel inside the liquid cooling plate 103 through the cooling pipe 232 and the inlet pipe of the liquid cooling plate 103. Then, the coolant enters the cooling tank 201 through the outlet pipe of the liquid cooling plate 103 and the cooling pipe 231, so that the coolant can circulate inside the liquid cooling plate 103 to carry away the heat generated by the power battery pack 101. It should be noted that the cooling device 202 can cool the coolant in the cooling box 201, thereby improving the heat dissipation effect of the power battery pack 101. In order to recover the heat at the power battery pack 101, such as Figure 1 and Figure 3As shown, a heat storage unit 3 is provided, and the heat storage unit 3 includes a heat exchanger 301, a heating liquid tank 302, and a pipeline 303. The heat exchanger 301 is located at the cooling pipe 231, allowing the coolant to enter the internal flow channel of the liquid cooling plate 103. The flowing coolant carries the heat from the power battery pack 101 out and enters the cooling pipe 231 through the outlet pipe of the liquid cooling plate 103. The coolant then exchanges heat with the heating liquid inside the heating liquid tank 302 through the heat exchanger 301. Specifically, the hot inlet and hot outlet pipes of the heat exchanger 301 are both connected to the cooling pipe 231, while the cold inlet and cold outlet pipes of the heat exchanger 301 are connected to the heating liquid tank 302 via the pipeline 303. More specifically, the pipeline 303 includes a heating pipe 331 and a heating pipe 332. The heating pipe 331... The heat exchanger 301 is connected to the cold inlet pipe, and the heating pipe 332 is connected to the cold outlet pipe of the heat exchanger 301. When the heat generated by the power battery pack 101 is carried out by the coolant of the liquid cooling plate 103, the coolant will flow into the hot flow channel inside the heat exchanger 301 through the cooling pipe 231. At the same time, the heating liquid inside the heating tank 302 will flow into the cold inlet pipe of the heat exchanger 301 through the heating pipe 331. Thus, the heating liquid and the coolant will exchange heat inside the heat exchanger 301. The heated liquid after heat exchange will flow into the heating tank 302 through the heating pipe 332, and the coolant after heat exchange will enter the interior of the cooling tank 201. Thus, the heat of the power battery pack 101 is recovered through the heat exchange function of the heat exchanger 301, causing the temperature of the heating liquid inside the heating tank 302 to rise. In addition, such as Figure 1 As shown, a storage tank 4 is also provided. The storage tank 4 is used to store the heated liquid after heating, thereby storing the recovered heat. The storage tank 4 is equipped with a heat preservation function, and the storage tank 4 is connected to the heating liquid tank 302 via a pipe 5. The pipe 5 specifically includes an inlet pipe 501 and an outlet pipe 502. The inlet pipe 501 is used to discharge the heating liquid inside the heating liquid tank 302 into the storage tank 4 for storage, while the outlet pipe 502 is used to discharge the cooled heating liquid inside the storage tank 4 into the heating liquid tank 302. It should be noted that a heating liquid tank 302 is also provided with... A temperature sensor is provided to monitor the temperature of the heating liquid inside the heating liquid tank 302. When the temperature of the heating liquid reaches the required recovery temperature, the heat exchanger 301 is stopped, the flow of heating liquid between the heating liquid tank 302 and the heat exchanger 301 is stopped, and the heating liquid inside the heating liquid tank 302 is discharged into the storage tank 4 for storage, thereby storing heat for use in subsequent heating. After the power battery pack 101 is heated, the heating liquid inside the storage tank 4 is cooled down and can be discharged into the heating liquid tank 302 through the outlet pipe 502. Furthermore, since the power battery pack 101 generates significant heat during operation, its battery box 102 typically has poor insulation to improve heat dissipation. Therefore, in cold weather such as winter, after shutdown, the residual heat of the power battery pack 101 dissipates quickly, and the low ambient temperature also comes into contact with it, causing power loss due to low temperatures. To ensure good heat dissipation during operation and good insulation after shutdown, such as… Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the battery box 102 is configured to include an outer box 121, an inner box 122, a mezzanine 123, and a pipe 124. The inner box 122 is located inside the outer box 121, and a mezzanine 123 is formed between the inner wall of the outer box 121 and the outer wall of the inner box 122. The outer box 121 and the inner box 122 are fixedly connected by a connecting plate 6, which is a U-shaped frame plate. The connecting plate 6 divides the mezzanine 123 between the outer box 121 and the inner box 122 into sections. The interior of the mezzanine 123 is connected to the liquid storage tank 4 via the pipe 124. The pipe 124 specifically includes a first connecting pipe 1241 and a second connecting pipe 1242. The first connecting pipe 1241 is used to drain the heating liquid inside the liquid storage tank 4 into the mezzanine 123, while the second connecting pipe 1242... 2 is used to allow the heating liquid inside the interlayer 123 to be discharged into the liquid storage tank 4, so that the heating liquid can circulate in the liquid storage tank 4 and the interlayer 123. In addition, an air inlet valve 7 is also provided on the top of the outer wall of the outer box 121. The air inlet valve 7 is used for air intake and exhaust inside the interlayer 123. A cooling pipe 9 is also connected to the connecting pipe 1241 through a connector. The cooling pipe 9 is connected to the cooling box 201. The cooling pipe 9 is used to allow the coolant inside the cooling box 201 to flow into the interlayer 123. A cooling pipe 10 is connected to the connecting pipe 2242 through a connector. The other end of the cooling pipe 10 is connected to the cooling box 201. The cooling pipe 10 is used to allow the liquid inside the interlayer 123 to flow into the cooling box 201. Furthermore, the connection status between the connector of connecting pipe 1241 and cooling pipe 9 is controlled by valve 8. Connecting pipe 1241 is divided into a first pipe 141 and a second pipe 142 by the connector. The first pipe 141 is the section from the liquid storage tank 4 to the connector of valve 8, and the second pipe 142 is the section from the connector to the interlayer 123. Connecting pipe 1242 is divided into a third pipe 143 and a fourth pipe 144 by the connector. The third pipe 143 is the section from the liquid storage tank 4 to the connector of valve 8, and the fourth pipe 144 is the section from the connector to the interlayer 123. The connection status between connecting pipe 1241 and cooling pipe 9 is configured such that when connecting pipe 1241 and cooling pipe 9 are connected by valve 8, valve 8 will control the connection of the first pipe 141 to the second pipe 9. When the connection between pipe 141 and pipe 142 is closed, cooling pipe 39 is connected to pipe 142, allowing the coolant discharged from cooling tank 1 201 through cooling pipe 39 to flow into the interior of jacket 123 through cooling pipe 39 and pipe 142. Correspondingly, when cooling pipe 410 is connected to connecting pipe 2242, cooling pipe 3143 and pipe 4144 are closed, allowing cooling pipe 414 to connect to cooling pipe 410, and the coolant inside jacket 123 can enter the interior of cooling tank 1 201 through cooling pipe 414 and cooling pipe 410, allowing the coolant to flow inside jacket 123 to dissipate heat from the power battery pack 101. Additionally, it should be noted that when the first pipe 141 is connected to the second pipe 142, the connection between the first connecting pipe 1241 and the fourth cooling pipe 10 is closed. Correspondingly, when the third pipe 143 is connected to the fourth pipe 144, the connection between the fourth cooling pipe 10 and the second connecting pipe 1242 is closed. When it is necessary to heat the power battery pack 101, the valve 8 connects the first pipe 141 and the second pipe 142. Therefore, the heating liquid in the storage tank 4 will enter the interior of the interlayer 123 through the first connecting pipe 1241, and then flow into the interior of the storage tank 4 through the second connecting pipe 1242, thereby heating the interior of the battery pack 102. After the power battery pack 101 is shut down, the intake valve 7 is activated and the liquid inside the interlayer 123 is simultaneously pumped out by the pump body, so that the interlayer 123 is filled with air. The heat insulation performance of the air makes the wall of the battery box 102 have good heat insulation, preventing the residual heat of the power battery pack 101 from dissipating too quickly. The heat insulation of the battery box 102 can also block the low temperature of the outside, thereby reducing the loss of the power battery pack 101 due to low temperature. When the power battery pack 101 is working, by filling the interlayer 123 with coolant, the heat dissipation effect of the battery pack can be avoided due to the heat insulation of the wall of the battery box 102. To recover and utilize the heat from other heat dissipation components of the vehicle, such as the vehicle's motor which generates a lot of heat during operation, a second cooling unit 11 and a second heating liquid tank 13 are provided. The second cooling unit 11 has the same structure as the first cooling unit 2. The cooling tank in the second cooling unit 11 is connected to the other heat-generating units 12 of the vehicle through a pipeline, and the heat from the heat-generating units 12 is also recovered through a second heat exchanger 14. The second heat exchanger 14 is connected to the second heating liquid tank 13 through a pipeline, so that the heating liquid after heat recovery flows into the interior of the second heating liquid tank 13. The second heating liquid tank 13 is connected to the storage tank 4 through a pipeline. After the temperature inside the second heating liquid tank 13 reaches the required temperature, the heating liquid inside the second heating liquid tank 13 is discharged into the storage tank 4 for storage. It should be noted that the flow of the above liquids is driven by the pump body, and the heating liquid and the cooling liquid are the same medium.

[0018] A method for using a power battery energy storage thermal management system includes the following steps: Step 1: After the vehicle starts, the power battery pack 101 starts. When it is necessary to heat the power battery pack 101, the valve 8 at the first connecting pipe 1241 and the third cooling pipe 9 is controlled to connect the reservoir 4 and the interior of the interlayer 123 through the first connecting pipe 1241. Correspondingly, the valve 8 at the second connecting pipe 1242 and the fourth cooling pipe 10 is controlled to connect the reservoir 4 and the interior of the interlayer 123 through the second connecting pipe 1242. The pump is started so that the heating liquid stored in the reservoir 4 can enter the interlayer 123 inside the battery pack 102 through the first connecting pipe 1241 and flow back to the reservoir 4 through the second connecting pipe 1242. This allows the heating liquid to flow inside the interlayer 123, and the internal temperature of the battery pack 102 is raised through heat exchange, thereby heating the power battery pack 101. Step 2: Monitor the temperature inside the battery box 102 using a temperature sensor. When the temperature inside the battery box 102 reaches the required operating temperature of the power battery pack 101, without further heating, shut off the liquid supply to the liquid storage tank 4. Pump the heating liquid inside the jacket 123 into the liquid storage tank 4, filling the jacket 123 with air. Control the valve 8 at the connection pipe 1241 and the cooling pipe 39 to close the connection between the first pipe 141 and the second pipe 142, connecting the second pipe 142 and the cooling pipe 39. Similarly, control the valve 8 at the connection pipe 2242 and the cooling pipe 40 to close the connection between the third pipe 143 and the fourth pipe 144, connecting the fourth pipe 144 and the cooling pipe 40. Step 3: After the internal temperature of the battery box 102 rises, the pump at the cooling box 201 is turned on, causing the cooling box 201 to discharge liquid. The coolant inside the cooling box 201 flows into the flow channel inside the liquid cooling plate 103 through the cooling pipe 232 and the inlet pipe of the liquid cooling plate 103. Then, the coolant enters the cooling box 201 through the outlet pipe of the liquid cooling plate 103 and the cooling pipe 231, so that the coolant can circulate inside the liquid cooling plate 103 to remove the heat generated by the power battery pack 101. At the same time, the coolant inside the cooling box 201 also enters the interlayer 123 through the pump via the cooling pipe 9 and the second pipe 142, and then enters the cooling box 201 through the fourth pipe 144 and the fourth cooling pipe 10, so that the coolant flows inside the interlayer 123. The coolant flowing inside the liquid cooling plate 103 and the interlayer 123 dissipates heat from the power battery pack 101, improving the heat dissipation effect. Step 4: After the heat generated by the power battery pack 101 is carried away by the coolant in the liquid cooling plate 103, the coolant flows into the hot flow channel inside the heat exchanger 301 through the cooling pipe 231. At the same time, the heating liquid inside the heating tank 302 flows into the cold flow inlet pipe 501 of the heat exchanger 301 through the heating pipe 331. Thus, the heating liquid and coolant exchange heat inside the heat exchanger 301. After heat exchange, the heating liquid flows into the heating tank 302 through the heating pipe 332, while the coolant enters the cooling tank 201. Thus, the heat of the power battery pack 101 is recovered through the heat exchange function of the heat exchanger 301, causing the temperature of the heating liquid inside the heating tank 302 to rise. Step 5: When the temperature of the heating fluid reaches the required recovery temperature, stop the heat exchanger 301, stop the flow of heating fluid between the heating fluid tank 302 and the heat exchanger 301, and drain the heating fluid inside the heating fluid tank 302 into the storage tank 4 for storage, thereby storing the heat for use in subsequent heating. At the same time, the heat generated by the vehicle's motor is dissipated through the cooling unit 11, and the heat from the heating unit 12 is recovered through the heat exchanger 14. After the recovered heating fluid reaches the required temperature, it is drained into the storage tank 4 for storage. Step Six: After shutdown, cooling unit 12 stops supplying liquid, cooling unit 21 stops supplying liquid, and cooling box 1201 extracts the coolant from the inside of the interlayer 123, so that the inside of the interlayer 123 is filled with air, and the air inside the interlayer 123 is used to keep the power battery pack 101 warm.

[0019] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A power battery energy storage thermal management system, comprising a battery unit (1), a cooling unit (2), and a thermal storage unit (3), characterized in that, The battery unit (1) includes a power battery pack (101), a battery box (102) and a liquid cooling plate (103). The power battery pack (101) and the liquid cooling plate (103) are both located inside the battery box (102), and the liquid cooling plate (103) is located below the power battery pack (101) for heat dissipation of the power battery pack (101). A temperature sensor is also provided inside the battery box (102). The water inlet pipe and the water outlet pipe of the liquid cooling plate (103) extend to the outside of the battery box (102), and the water inlet pipe and the water outlet pipe of the liquid cooling plate (103) are connected to the cooling unit (2) through pipelines. Cooling unit 1 (2) includes cooling tank 1 (201), refrigeration device (202) and pipeline 1 (203). Cooling tank 1 (201) is used to hold coolant and supply coolant to liquid cooling plate (103) through pipeline 1 (203). Refrigeration device (202) is used to cool the heat flow entering cooling tank 1 (201). Pipeline 1 (203) includes cooling pipe 2 (232) for liquid inlet to liquid cooling plate (103) and cooling pipe 1 (231) for liquid outlet from liquid cooling plate (103). The heat storage unit (3) includes a heat exchanger (301), a heating liquid tank (302), and a pipeline (303). The heat exchanger (301) is located at the cooling pipe (231) and is used to exchange heat with the coolant discharged from the liquid cooling plate (103). The heat inlet pipe and heat outlet pipe of the heat exchanger (301) are both connected to the cooling pipe (231). The cooling liquid of the heat exchanger (301) is... The inlet pipe and the outlet pipe are respectively connected to the heating tank (302) via the second pipe (303). The second pipe (303) includes a heating pipe (331) and a heating pipe (332). The heating pipe (331) is connected to the outlet pipe (501) of the heat exchanger (301), and the heating pipe (332) is connected to the outlet pipe (502) of the heat exchanger (301). The heating liquid tank (302) is connected to the storage tank (4) via the pipeline (5). The storage tank (4) has a heat preservation function. The pipeline (5) includes an inlet pipe (501) and an outlet pipe (502). A temperature sensor is also installed inside the heating liquid tank (302).

2. The power battery energy storage thermal management system as described in claim 1, characterized in that, The battery box (102) includes an outer box (121), an inner box (122), a mezzanine (123), and a pipeline (124). The inner box (122) is disposed inside the outer box (121), and a mezzanine (123) is disposed between the inner wall of the outer box (121) and the outer wall of the inner box (122). The outer box (121) and the inner box (122) are fixedly connected by a connecting plate (6). The interior of the mezzanine (123) is connected to the liquid storage tank (4) through the pipeline (124). The pipeline four (124) includes connecting pipe one (1241) and connecting pipe two (1242). An air intake valve (7) is also provided on the top of the outer wall of the outer box (121). A cooling pipe three (9) is connected to the connecting pipe one (1241) through a connector, and the cooling pipe three (9) is connected to the cooling box one (201). A cooling pipe four (10) is connected to the connecting pipe two (1242) through a connector, and the other end of the cooling pipe four (10) is connected to the cooling box one (201).

3. The power battery energy storage thermal management system as described in claim 2, characterized in that, The connection state between the connector of the first connecting pipe (1241) and the third cooling pipe (9) is controlled by the valve (8). The first connecting pipe (1241) is divided into the first pipe (141) and the second pipe (142) through the connector. The second connecting pipe (1242) is divided into the third pipe (143) and the fourth pipe (144) through the connector. The connection state between the first connecting pipe (1241) and the third cooling pipe (9) is configured such that after the first connecting pipe (1241) and the third cooling pipe (9) are connected, the valve (8) will close the connection between the first pipe (141) and the second pipe (142), and the third cooling pipe (9) will be connected to the second pipe (142). After the fourth cooling pipe (10) is connected to the second connecting pipe (1242), the third pipe (143) and the fourth pipe (144) will be closed, and the fourth cooling pipe (10) will be connected to the fourth pipe (144).

4. The power battery energy storage thermal management system as described in claim 3, characterized in that, The liquid storage tank (4) is also connected to a second cooling unit (11) and a second heating liquid tank (13). The second cooling unit (11) has the same structure as the first cooling unit (2). The cooling tank in the second cooling unit (11) is connected to the heating unit (12) through a pipeline. The heat of the heating unit (12) is recovered through the second heat exchanger (14). The second heat exchanger (14) is connected to the second heating liquid tank (13) through a pipeline. The second heating liquid tank (13) is connected to the liquid storage tank (4) through a pipeline.

5. A method of using a power battery energy storage thermal management system according to claim 4, characterized in that, Includes the following steps: Step 1: When the power battery needs to be heated, the liquid storage tank (4) and the interior of the interlayer (123) are connected by the first connecting pipe (1241) by controlling the valve (8). The liquid storage tank (4) and the interior of the interlayer (123) are connected by the second connecting pipe (1242) by controlling the valve (8). The heating liquid stored in the liquid storage tank (4) is then connected to the interlayer (123) inside the battery box (102) through the first connecting pipe (1241) by starting the pump. The heating liquid flows in the interlayer (123) and heats up the interior of the battery box (102) through heat exchange, thereby heating the power battery pack (101). Step 2: Monitor the temperature inside the battery box (102) using a temperature sensor. When the temperature inside the battery box (102) reaches the required operating temperature of the power battery pack (101), shut off the liquid supply to the storage tank (4). Pump the heating liquid inside the jacket (123) into the storage tank (4) using a pump. Control the valve (8) at the connection pipe 1 (1241) and the cooling pipe 3 (9) to close the connection between the first pipe (141) and the second pipe (142), so that the second pipe (142) is connected to the cooling pipe 3 (9). Similarly, control the valve (8) at the connection pipe 2 (1242) and the cooling pipe 4 (10) to close the connection between the third pipe (143) and the fourth pipe (144), so that the fourth pipe (144) is connected to the cooling pipe 4 (10). Step 3: After the internal temperature of the battery box (102) rises, turn on the pump at the cooling box one (201) to allow the cooling box one (201) to discharge liquid. The coolant inside the cooling box one (201) flows into the flow channel inside the liquid cooling plate (103) through the cooling pipe two (232) and the liquid inlet pipe (501) of the liquid cooling plate (103). Then, the coolant enters the cooling box one (201) through the liquid outlet pipe (502) of the liquid cooling plate (103) and the cooling pipe one (231), thereby allowing the coolant to flow in the liquid cooling plate. The cooling plate (103) circulates inside to carry away the heat generated by the power battery pack (101). At the same time, the coolant inside the cooling box (201) is pumped into the interlayer (123) through the cooling pipe (9) and then into the cooling box (201) through the cooling pipe (10). This allows the coolant to flow inside the interlayer (123). The coolant flowing inside the liquid cooling plate (103) and the interlayer (123) dissipates heat from the power battery pack (101) and improves the heat dissipation effect. Step 4: After the heat generated by the power battery pack (101) is carried away by the coolant of the liquid cooling plate (103), the coolant will flow into the hot flow channel inside the heat exchanger (301) through the first cooling pipe (231). At the same time, the heating liquid inside the first heating tank (302) will flow into the cold flow inlet pipe (501) of the heat exchanger (301) through the first heating pipe (331). Thus, the heating liquid and the coolant will exchange heat inside the first heat exchanger (301). The heated liquid after heat exchange will flow into the first heating tank (302) through the second heating pipe (332), and the coolant after heat exchange will enter the interior of the first cooling tank (201). Thus, the heat of the power battery pack (101) is recovered through the heat exchange function of the first heat exchanger (301), causing the temperature of the heating liquid inside the first heating tank (302) to rise. Step 5: When the temperature of the heating liquid reaches the required recovery temperature, stop the heat exchange of heat exchanger 1 (301), and drain the heating liquid inside the heating liquid tank 1 (302) into the storage tank (4) for storage, thereby storing the heat. At the same time, the heat generated by the vehicle motor is dissipated through the cooling unit 2 (11), and the heat of the heating unit (12) is recovered through the heat exchanger 2 (14). After the recovered heating liquid reaches the required temperature, it is drained into the storage tank (4) for storage. Step 6: After shutdown, cooling unit 1 (2) stops supplying liquid, cooling unit 2 (11) stops supplying liquid, and cooling box 1 (201) extracts the coolant inside the interlayer (123), so that the interlayer (123) is filled with air, and the air inside the interlayer (123) is used to keep the power battery pack (101) warm.

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