Energy storage battery heat management system combining waste heat refrigeration and heat pipe

Abstract

The utility model relates to an energy storage battery thermal management system combining waste heat refrigeration and a heat pipe. The energy storage battery thermal management system comprises a boiler, a heat exchanger, a refrigerator, an air conditioner and a battery subsystem, a smoke outlet of the boiler communicates with a hot-end smoke inlet of the heat exchanger, a hot-end medium outlet of the heat exchanger communicates with a hot-end medium inlet of the refrigerating machine, a cold-end medium inlet of the heat exchanger communicates with an inlet pipe, and a cold-end smoke outlet of the heat exchanger communicates with a smoke outlet pipe. A cold end medium outlet of the refrigerator communicates with a water inlet of the air conditioner, an air outlet of the air conditioner communicates with an air outlet pipe, and an air inlet of the air conditioner communicates with an air inlet pipe; the battery subsystem comprises a battery cabin as well as a battery and a heat pipe which are arranged in the battery cabin, the heat pipe comprises an evaporation section and a condensation section, and the evaporation section is attached to the surface of the battery; the ends, away from the air conditioner, of the air outlet pipe and the air inlet pipe penetrate through the outer side wall of the battery bin and are located in the battery bin. According to the system, the heat dissipation of the battery can be ensured, the working temperature of the battery is in a proper range, and meanwhile, the battery is applicable to more occasions.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of energy storage batteries, in particular to an energy storage battery thermal management system which combines waste heat refrigeration with a heat pipe. Background Art

[0002] Energy storage is an important part of the power system, among which electrochemical energy storage has been widely used due to its short response time, high energy density, low maintenance cost, and short construction period. However, due to the low maturity of the current energy storage lithium battery industry and the relatively lagging formulation of relevant safety standards, electrochemical energy storage safety accidents occur frequently. In the past decade, there have been many fire and explosion accidents in energy storage power stations around the world, all of which were caused by different reasons, resulting in thermal runaway inside the battery, which in turn caused the explosion. For lithium batteries, temperature has a great impact on their efficiency, life and safety. Utility Model Content

[0003] The utility model provides an energy storage battery thermal management system that utilizes waste heat refrigeration combined with a heat pipe, which can ensure the heat dissipation of the battery, keep the battery operating temperature within a suitable range, and also make the battery applicable to more occasions.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A thermal management system for energy storage batteries that combines waste heat refrigeration with heat pipes, including a boiler, a heat exchanger, a refrigerator, an air conditioner, and a battery subsystem;

[0006] The flue gas outlet of the boiler is connected to the hot end flue gas inlet of the heat exchanger, the hot end medium outlet of the heat exchanger is connected to the hot end medium inlet of the refrigerator, the cold end medium inlet of the heat exchanger is connected to an inlet pipe, and the cold end flue gas outlet of the heat exchanger is connected to a flue gas outlet pipe;

[0007] The cold end medium outlet of the refrigerator is connected to the water inlet of the air conditioner, the air outlet of the air conditioner is connected to the air outlet pipe, and the air inlet of the air conditioner is connected to the air inlet pipe;

[0008] The battery subsystem includes a battery compartment and a battery and a heat pipe arranged in the battery compartment. The heat pipe includes an evaporation section and a condensation section. The evaporation section is attached to the surface of the battery, and two ends of the evaporation section are connected to two ends of the condensation section.

[0009] One end of the air outlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located therein, and one end of the air inlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located therein.

[0010] Preferably, a partition is provided in the battery compartment, the partition divides the battery compartment into a storage chamber and a heat dissipation chamber, the battery is installed in the storage chamber, the evaporation section is located in the storage chamber and attached to the surface of the battery, the condensation section is placed in the heat dissipation chamber, and both ends of the evaporation section pass through the partition and are connected to both ends of the condensation section;

[0011] One end of the air outlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located in the storage cavity, and one end of the air inlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located in the storage cavity.

[0012] Preferably, the surface of the partition is provided with a heat insulating layer or is made of a heat insulating material.

[0013] Preferably, the medium used in the refrigerator is water, the hot end medium outlet of the heat exchanger is connected to the hot end medium inlet of the refrigerator via an outlet pipe, and both the inlet pipe and the outlet pipe are connected to the circulating water pipeline in the power plant unit.

[0014] Preferably, a return pipe is connected between the water outlet of the air conditioner and the inlet pipe.

[0015] Preferably, the flue outlet of the boiler is connected to the hot-end flue gas inlet of the heat exchanger.

[0016] Preferably, there are multiple batteries and multiple heat pipes, and multiple heat pipes are used in conjunction with multiple batteries.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The heat of the power plant exhaust gas is absorbed by the heat exchanger as a heat source for cooling, which utilizes the waste heat of the power plant exhaust gas, reduces the heat loss of the exhaust gas, and improves the economy.

[0019] 2. The cold source provided by the refrigerator makes the air conditioner generate low-temperature air. The low-temperature air enters the battery compartment and takes away the heat generated by the battery, thereby cooling the battery and making the battery operating temperature within an appropriate range. This plays an important role and significance in improving battery life, efficiency, and system safety and economy.

[0020] 3. Heat pipe is a passive heat conducting element with extremely high thermal conductivity. Heat pipe can be used for batteries with fast heating up, that is, high working conditions, and can also be used for batteries with slow heating up, that is, low working conditions. It can ensure the heat dissipation of the battery during use and keep its operating temperature within an appropriate range. At the same time, the whole system can also ensure that the battery can be used in more occasions under the premise of heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 The overall schematic diagram of the system in the embodiment of the utility model Figure 1 ;

[0023] Figure 2 The overall schematic diagram of the system in the embodiment of the utility model Figure 2 ;

[0024] Figure 3 The overall schematic diagram of the system in the embodiment of the utility model Figure 3 .

[0025] Description of reference numerals:

[0026] 1. Boiler; 2. Heat exchanger; 3. Refrigerator; 4. Air conditioner; 5. Battery subsystem; 51. Battery compartment; 52. Battery; 53. Heat pipe; 531. Evaporation section; 532. Condensation section; 54. Partition; 55. Storage chamber; 56. Heat dissipation chamber; 6. Inlet pipe; 7. Outlet pipe; 8. Smoke outlet pipe; 9. Return pipe; 10. Circulating water pipe; 11. Air inlet pipe; 12. Air outlet pipe. DETAILED DESCRIPTION

[0027] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The present invention provides a thermal management system for energy storage batteries that utilizes waste heat refrigeration combined with heat pipes. Figure 1 As shown, it specifically includes a boiler 1, a heat exchanger 2, a refrigerator 3, an air conditioner 4 and a battery subsystem 5; wherein the flue gas outlet of the boiler 1 is connected to the hot-end flue gas inlet of the heat exchanger 2, the hot-end medium outlet of the heat exchanger 2 is connected to the hot-end medium inlet of the refrigerator 3, the cold-end medium inlet of the heat exchanger 2 is connected to an inlet pipe 6, and the cold-end flue gas outlet of the heat exchanger 2 is connected to a flue gas outlet pipe 8. During operation, the flue gas and the medium exchange heat in the heat exchanger 2, and the low-temperature medium is heated to a high-temperature medium by utilizing the waste heat of the flue gas. The high-temperature medium after heat exchange enters the refrigerator 3 through the hot-end medium inlet and acts as a heat source for the refrigerator 3; it is also known that the cold-end medium outlet of the refrigerator 3 is connected to the water inlet of the air conditioner 4, the air outlet of the air conditioner 4 is connected to an outlet pipe 12, and the air inlet of the air conditioner 4 is connected to an air inlet pipe 11. The battery subsystem 5 includes a battery compartment 51 and a battery compartment 51 disposed in the battery compartment 51. The battery 52, the end of the air outlet pipe 12 away from the air conditioner 4 passes through the outer wall of the battery compartment 51 and is located therein, and the end of the air inlet pipe 11 away from the air conditioner 4 passes through the outer wall of the battery compartment 51 and is located therein, that is, when working, the refrigerator 3 provides a heat exchange cold source for the air conditioner 4, and exchanges heat with the air entering from the air inlet pipe 11, so that the air temperature is reduced, and then the low-temperature air enters the battery compartment 51 from the air outlet pipe 12, and takes away the heat generated by the battery 52 in the battery compartment 51 through the low-temperature air, and forms high-temperature air, and then enters the air inlet pipe 11, and enters the air conditioner 4 again, exchanges heat with the low-temperature medium, and the cycle is repeated to cool the air in the battery compartment 51, thereby improving the working environment of the battery 52, so that the working temperature of the battery 52 is within an appropriate range, which has an important role and significance for improving the life and efficiency of the battery 52 and the safety and economy of the system.

[0031] In order to quickly cool down the battery 52 that heats up faster, preferably, the battery subsystem 5 also includes a heat pipe 53, and the heat pipe 53 includes an evaporation section 531 and a condensation section 532. The evaporation section 531 is attached to the surface of the battery 52, and the two ends of the evaporation section 531 are connected to the two ends of the condensation section 532. When in use, the medium in the evaporation section 531 of the heat pipe 53 can quickly absorb the heat generated by the battery 52, and then vaporize into the condensation section 532, and then exchange heat with the low-temperature air discharged from the air outlet 12. The medium in the condensation section 532 is liquefied again and enters the evaporation section 531 to continue to absorb the heat generated by the battery 52. ​​The high-temperature air generated after the heat exchange with the condensation section 532 returns to the air conditioner 4 through the air inlet duct 11, exchanges heat with the low-temperature medium provided by the refrigerator 3, and forms low-temperature air again, and the cycle repeats. Because the heat pipe 53 is a passive heat-conducting element with extremely high thermal conductivity, it uses the phase change principle and capillary action to make its own heat transfer efficiency hundreds to thousands of times higher than that of pure copper of the same material. Therefore, the heat absorption capacity of the heat pipe 53 is very outstanding. By using the heat pipe 53 as an intermediate to cool the battery 52, for the battery 52 that heats up faster, the heat of the battery 52 itself is quickly transferred to the evaporation section 531 of the heat pipe 53, and then the heat is dissipated by the condensation section 532, so that the battery 52 can be cooled quickly, so that the heat dissipation of the battery 52 at a higher output power is guaranteed, and the service life of the battery 52 is increased. In addition, the system can make the battery 52 suitable for more occasions while ensuring heat dissipation.

[0032] In addition, a partition 54 is provided in the battery compartment 51, and the partition 54 divides the battery compartment 51 into a storage chamber 55 and a heat dissipation chamber 56. The battery 52 is installed at the bottom of the storage chamber 55, the evaporation section 531 is located in the storage chamber 55 and attached to the surface of the battery 52, and the condensation section 532 is placed in the heat dissipation chamber 56. The two ends of the evaporation section 531 pass through the partition 54 and are connected to the two ends of the condensation section 532, and the end of the air outlet duct 12 away from the air conditioner 4 passes through the outer wall of the battery compartment 51 and is located in the storage chamber 55, and the air outlet duct 12 passes through the outer wall of the battery compartment 51 and is located in the storage chamber 55. The end of the air duct 11 away from the air conditioner 4 passes through the outer wall of the battery compartment 51 and is located in the storage chamber 55; the partition 54 is set to separate the battery 52 and the evaporation section 531 from the condensation section 532, so that the heat absorption of the evaporation section 531 and the heat dissipation of the condensation section 532 are separated, and each works stably, and the space of the heat dissipation chamber 56 where the condensation section 532 is placed is reduced. When the condensation section 532 exchanges heat with the low-temperature air entering the heat dissipation chamber 56, the condensation rate of the condensation section 532 is faster. Specifically, the surface of the partition 54 is provided with a heat insulation layer or is made of a heat insulation material, so that the partition 54 has a heat insulation function, which prevents the heat generated by the battery 52 from entering the heat dissipation chamber 56 from the storage chamber 55, so that the evaporation section 531 can fully absorb the heat generated by the battery 52 from the storage chamber 55, and cool down the environment where the battery 52 is placed and the battery 52.

[0033] Specifically, Figure 2 As shown, the refrigerator 3 is a lithium bromide refrigerator 3, and the medium used in the refrigerator 3 is water. The hot end medium outlet of the heat exchanger 2 and the hot end medium inlet of the refrigerator 3 are connected by an outlet pipe 7. The inlet pipe 6 and the outlet pipe 7 are both connected to the circulating water pipeline 10 in the power plant unit. In actual use, the inlet pipe 6 is connected to the circulating water pipeline 10 at the condensate outlet of the condenser, and the outlet pipe 7 is connected to the circulating water pipeline 10 at the water inlet of the low-temperature heater on the circulating water pipeline 10, so that part of the condensed water coming out of the condenser enters the inlet pipe 6, and then enters the heat exchanger 2 to exchange heat with the flue gas. After the heat exchange, part of the high-temperature water is returned to the circulating water pipeline 10, and then enters the low-temperature heater to reduce the consumption of steam, and the other part enters the refrigerator 3 to serve as a heat source.

[0034] Specifically, Figure 2 As shown, in order to utilize the hot water discharged from the air outlet, the return pipe 9 is connected between the water outlet of the air conditioner 4 and the inlet pipe 6, so that the hot water after heat exchange in the air conditioner 4 enters the return pipe 9, and then enters the inlet pipe 6 and enters the heat exchanger 2 together with the condensed water for heat exchange. A part of the high-temperature water formed after the heat exchange is returned to the circulating water pipe 10, and then enters the low-temperature heater to reduce the consumption of steam, and the other part enters the refrigerator 3 to act as a heat source, so that the medium water discharged from the refrigerator 3 can be reused.

[0035] Specifically, because the flue gas generated by the boiler 1 is finally discharged from the flue outlet after multiple heat exchanges, and the flue gas temperature at the flue outlet is still several hundred degrees, the flue outlet of the boiler 1 is connected with the hot end flue gas inlet of the heat exchanger 2, so that the last residual heat in the flue gas can be reused to avoid energy waste.

[0036] Specifically, there are multiple batteries 52 in the actual battery compartment 51. Correspondingly, in order to dissipate heat well for the batteries 52, there are also multiple heat pipes 53, and the number is the same as that of the batteries 52. The multiple heat pipes 53 are used in conjunction with the multiple batteries 52 to cool the batteries 52 together. Of course, in order to better condense the medium in the condensation section 532 of the multiple heat pipes 53, there are multiple air outlet pipes 12. The multiple air outlet pipes 12 are connected to the air outlet of the air conditioner 4 through the main pipe. The air outlets of the multiple air outlet pipes 12 are arranged one by one at the condensation section 532 of the multiple heat pipes 53, so that the condensation effect of the condensation section 532 is better and the speed is faster. Figure 3 As shown, the number of batteries 52, heat pipes 53 and air outlet pipes 12 are all two.

[0037] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A thermal management system for energy storage batteries that combines waste heat refrigeration with heat pipes, characterized in that: Includes boiler, heat exchanger, chiller, air conditioner and battery subsystems; The flue gas outlet of the boiler is connected to the hot end flue gas inlet of the heat exchanger, the hot end medium outlet of the heat exchanger is connected to the hot end medium inlet of the refrigerator, the cold end medium inlet of the heat exchanger is connected to an inlet pipe, and the cold end flue gas outlet of the heat exchanger is connected to a flue gas outlet pipe; The cold end medium outlet of the refrigerator is connected to the water inlet of the air conditioner, the air outlet of the air conditioner is connected to the air outlet pipe, and the air inlet of the air conditioner is connected to the air inlet pipe; The battery subsystem includes a battery compartment and a battery and a heat pipe arranged in the battery compartment. The heat pipe includes an evaporation section and a condensation section. The evaporation section is attached to the surface of the battery, and two ends of the evaporation section are connected to two ends of the condensation section. One end of the air outlet duct away from the air conditioner passes through the outer side wall of the battery compartment and is located therein, and one end of the air inlet duct away from the air conditioner passes through the outer side wall of the battery compartment and is located therein.

2. The energy storage battery thermal management system combining waste heat refrigeration and heat pipe according to claim 1 is characterized in that: A partition is provided in the battery compartment, the partition divides the battery compartment into a storage chamber and a heat dissipation chamber, the battery is installed in the storage chamber, the evaporation section is located in the storage chamber and attached to the surface of the battery, the condensation section is placed in the heat dissipation chamber, and the two ends of the evaporation section pass through the partition and are connected to the two ends of the condensation section; One end of the air outlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located in the storage cavity, and one end of the air inlet duct away from the air conditioner passes through the outer wall of the battery compartment and is located in the storage cavity.

3. The energy storage battery thermal management system combining waste heat refrigeration and heat pipe according to claim 2 is characterized in that: The surface of the partition is provided with a heat insulation layer or is made of a heat insulation material.

4. The energy storage battery thermal management system combining waste heat refrigeration and heat pipe according to claim 1 is characterized in that: The medium used by the refrigerator is water, the hot end medium outlet of the heat exchanger is connected to the hot end medium inlet of the refrigerator through an outlet pipe, and the inlet pipe and the outlet pipe are both connected to the circulating water pipeline in the power plant unit.

5. The energy storage battery thermal management system combining waste heat refrigeration and heat pipe according to claim 4 is characterized in that: A return pipe is connected between the water outlet of the air conditioner and the inlet pipe.

6. The energy storage battery thermal management system combining waste heat refrigeration and heat pipe according to claim 1 is characterized in that: The flue outlet of the boiler is communicated with the hot end flue gas inlet of the heat exchanger.

7. The energy storage battery thermal management system combining waste heat refrigeration and heat pipes according to any one of claims 1 to 6, characterized in that: There are multiple batteries and multiple heat pipes, and multiple heat pipes are used in conjunction with multiple batteries.

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