Energy storage battery thermal management system combining waste heat refrigeration and liquid cooling heat dissipation

Abstract

The utility model relates to an energy storage battery thermal management system combining waste heat refrigeration and liquid cooling heat dissipation, which comprises a boiler, a heat exchanger, a refrigerator, an energy storage battery and a cooling assembly, and the cooling assembly is arranged on the peripheral side of the energy storage battery; a flue outlet of the boiler is communicated with a hot-end flue gas inlet of the heat exchanger, a cold-end flue gas outlet of the heat exchanger is communicated with a flue gas outlet pipe, a cold-end medium inlet of the heat exchanger is communicated with an inlet pipe, a hot-end medium outlet of the heat exchanger is communicated with a hot-end medium inlet of the refrigerating machine, and a cold-end medium outlet of the refrigerating machine is communicated with a medium inlet of the cooling assembly. A medium outlet of the cooling assembly is communicated with the inlet pipe. According to the system, flue gas waste heat can be used for providing a heat source for the refrigerating machine, a cooling medium is provided through the refrigerating machine, then the energy storage battery is cooled, it is guaranteed that the working temperature of the energy storage battery is within a proper range, the working environment of the energy storage battery is improved, and the system plays an important role in prolonging the service life of the battery, improving the efficiency and improving the system safety and economy.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal management of energy storage batteries, and in particular to an energy storage battery thermal management system combining waste heat refrigeration with liquid cooling. 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 a thermal management system for energy storage batteries that combines waste heat refrigeration with liquid cooling. The waste heat of flue gas is used to provide a heat source for a refrigerator, and a cooling medium is provided by the refrigerator to cool the energy storage battery, thereby ensuring that the operating temperature of the energy storage battery is within an appropriate range, improving the working environment of the energy storage battery, and having an important role and significance for improving battery life, efficiency, and system safety and economy.

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

[0005] A thermal management system for an energy storage battery combining waste heat cooling and liquid cooling, comprising a boiler, a heat exchanger, a refrigerator, an energy storage battery and a cooling assembly, wherein the cooling assembly is arranged on the outer peripheral side of the energy storage battery;

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

[0007] Preferably, the cooling assembly comprises a plurality of cooling plates, and the plurality of cooling plates are attached to the outer side wall of the energy storage battery;

[0008] The upper end and the lower end of the cooling plate are respectively provided with a medium inlet and a medium outlet. The medium inlet of the cooling plate is communicated with the cold end medium outlet of the refrigerator, and the medium outlet of the cooling plate is communicated with the inlet pipe.

[0009] Preferably, the cold end medium outlet of the refrigerator is connected to a supply main pipe, and the inlet pipe is connected to a return main pipe;

[0010] A supply pipe is connected between the medium inlet of the cooling plate and the supply main pipe, and the supply pipe is provided with a first control valve;

[0011] A reflux pipe is connected between the medium outlet of the cooling plate and the reflux main pipe, and the reflux pipe is provided with a second control valve.

[0012] Preferably, a temperature measuring device is provided on the outer side wall of the energy storage battery where any one of the cooling plates is located.

[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 serpentine channel is provided in the cooling plate, and the medium inlet of the cooling plate and the medium outlet of the cooling plate are both connected to the serpentine channel.

[0015] Preferably, the energy storage battery and the cooling assembly are both multiple, and the multiple cooling assemblies are correspondingly arranged on the outer peripheral sides of the multiple energy storage batteries.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The heat of the exhaust gas from the power plant is absorbed by the heat exchanger as a heat source for cooling, which utilizes the waste heat of the exhaust gas from the power plant, reduces the heat loss of the exhaust gas, and improves the economic efficiency.

[0018] 2. Cooling the energy storage battery with the low-temperature medium generated by the refrigerator can improve the working environment of the energy storage battery, which plays an important role and significance in improving battery life, efficiency and system safety and economy.

[0019] 3. The high-temperature medium formed by cooling the energy storage battery returns to the heat exchanger for reheating to form the heat source of the refrigerator, ensuring that the temperature of the heat source of the refrigerator is within the operating range, so that the refrigerator can stably produce a low-temperature medium of a certain temperature to ensure the stability of subsequent energy storage battery cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 It is a schematic diagram of the overall system of an embodiment of the present utility model.

[0022] Description of reference numerals:

[0023] 1. Boiler; 2. Heat exchanger; 3. Refrigerator; 4. Energy storage battery; 5. Cooling plate; 6. Smoke outlet pipe; 7. Inlet pipe; 8. Supply main pipe; 9. Supply pipe; 10. Reflux main pipe; 11. Reflux pipe; 12. First control valve; 13. Second control valve; 14. Outlet pipe; 15. Circulating water pipeline. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] like Figure 1As shown, the embodiment of the utility model provides a thermal management system for an energy storage battery combining waste heat refrigeration with liquid cooling and heat dissipation, comprising a boiler 1, a heat exchanger 2, a refrigerator 3, an energy storage battery 4 and a cooling component, wherein the cooling component is arranged on the outer peripheral side of the energy storage battery 4 for cooling the energy storage battery 4; wherein the cold source of the cooling component is specifically generated by the cooperation of the boiler 1, the heat exchanger 2 and the refrigerator 3, specifically, the flue outlet of the boiler 1 is connected to the hot end flue gas inlet of the heat exchanger 2, the cold end flue gas outlet of the heat exchanger 2 is connected to a smoke outlet pipe 6, the cold end medium inlet of the heat exchanger 2 is connected to an inlet pipe 7 for supplying a medium, and the hot end medium outlet of the heat exchanger 2 is connected to the hot end medium inlet of the refrigerator 3, so that during operation, the flue gas of the boiler 1 and the medium will exchange heat in the heat exchanger 2, and the heated medium can enter the refrigerator 3 to act as a heat source for the refrigerator 3 to work. The low-temperature medium generated after the refrigerator 3 works enters the inlet of the cooling component through the cold-end medium outlet, and then the low-temperature medium enters the cooling component to exchange heat with the energy storage battery 4, taking away the heat generated by the energy storage battery 4, thereby reducing the temperature of the energy storage battery 4 and improving the working environment of the energy storage battery 4, which has an important role and significance for improving the battery life, efficiency and system safety and economy; and the medium outlet of the cooling component is connected with the inlet pipe 7 at the cold-end medium inlet of the heat exchanger 2, and the high-temperature medium formed after heat exchange can enter the inlet pipe 7 again, and then enter the heat exchanger 2 through the cold-end medium inlet to exchange heat with the flue gas, the high-temperature medium is heated again, and then enters the refrigerator 3 to act as a heat source, ensuring that the heat source temperature is within a certain range, so that the refrigerator 3 can stably produce a low-temperature medium of a certain temperature, and ensure the stability of subsequent cooling of the energy storage battery 4. Of course, it can be known that when the high-temperature medium formed after heat exchange with the energy storage battery 4 continues to serve as the medium of the cooling component, the inlet pipe 7 at the cold end medium inlet of the heat exchanger 2 does not need to continuously replenish the medium, and only needs to be replenished once every period of time, so that the medium can circulate and continuously cool the energy storage battery 4. Of course, the above-mentioned refrigerator 3 can be a lithium bromide refrigerator 3, and the medium used is water. In this embodiment, the refrigerator 3 only draws the flow pipeline of the medium, and the other heat exchange pipelines of the refrigerator 3 are not drawn. Specifically, the refrigerator 3 is a lithium bromide refrigerator 3.

[0028] The supplied flue gas is discharged from the flue outlet of the boiler 1, and through heat exchange with the medium, the waste heat of the flue gas can be utilized before the flue gas is discharged into the outside air, thereby avoiding heat loss.

[0029] Specifically, the cooling assembly includes a plurality of cooling plates 5, and the plurality of cooling plates 5 are attached to the outer side wall of the energy storage battery 4. Preferably, according to the shape of the energy storage battery 4, the cooling plates 5 can be attached to the outer side wall of the energy storage battery 4 which is easy to heat up around its circumference. Of course, in actual use, the cooling plates 5 can be fixed by an external bracket so that they are attached to the outer side wall of the energy storage battery 4, or by other methods, such as bolt connection; each cooling plate 5 is responsible for cooling a certain part of the energy storage battery 4. Specifically, the upper end and the lower end of the cooling plate 5 are respectively provided with a medium inlet and a medium outlet, and the medium of the cooling plate 5 The inlet is connected with the cold end medium outlet of the refrigerator 3, and the medium outlet of the cooling plate 5 is connected with the inlet pipe 7 of the cold end medium inlet of the heat exchanger 2, so that the low-temperature medium at the cold end medium outlet of the refrigerator 3 enters the cooling plate 5, and then the high-temperature medium formed after heat exchange with the energy storage battery 4 enters the cooling medium inlet of the heat exchanger 2 to exchange heat with the flue gas again. The high-temperature medium is heated again and then enters the refrigerator 3, ensuring that the heat source temperature of the entire cycle process is basically the same, so that the temperature of the low-temperature medium produced by the refrigerator 3 is constant, so that the cooling process of the energy storage battery 4 can be carried out stably.

[0030] Specifically, the cold-end medium outlet of the refrigerator 3 is connected to the supply main pipe 8, the inlet pipe 7 at the cold-end medium inlet of the heat exchanger 2 is connected to the return main pipe 10, the medium inlet of the cooling plate 5 and the supply main pipe 8 are connected by a supply pipe 9, and the medium outlet of the cooling plate 5 and the return main pipe 10 are connected by a return pipe 11. That is, during the operation, the low-temperature medium first enters the supply main pipe 8, and then is divided into each supply pipe 9 to supply each cooling plate 5. After the low-temperature medium exchanges heat with the energy storage battery 4, it enters the return pipe 11, is collected into the return main pipe 10 through the return pipe 11, and enters the cold-end medium inlet of the heat exchanger 2 through the return main pipe 10. In order to facilitate sufficient heat exchange each time the low-temperature medium flows in the cooling plate 5, a first control valve 12 is provided in the supply pipe 9 and a second control valve 13 is provided in the return pipe 11. During use, the flow rate of the low-temperature medium in the cooling plate 5 can be controlled by adjusting the opening of the first control valve 12 and the second control valve 13 to change the temperature of the energy storage battery 4 at each cooling plate 5 to meet the needs of the user.

[0031] Specifically, the outer side wall of the energy storage battery 4 at any cooling plate 5 is provided with a temperature measuring device (not shown), and the temperature of the energy storage battery 4 at the cooling plate 5 can be monitored in real time by the temperature measuring device, so that the user can intuitively observe the real-time temperature range; preferably, the temperature measuring device is a temperature sensor, and the first control valve 12 and the second control valve 13 are solenoid valves. By setting the corresponding temperature range on the controller on the temperature sensor, and then automatically adjusting and coordinating the temperature sensor, the first control valve 12 and the second control valve 13, the cooled part of the energy storage battery 4 at each cooling plate 5 is within the required temperature range.

[0032] Specifically, the inlet pipe 7 at the cold end medium inlet of the heat exchanger 2 is connected to the circulating water pipeline 15 in the power plant unit, specifically connected to the circulating water pipeline 15 at the water outlet of the condenser. The hot end medium outlet of the heat exchanger 2 is connected to the hot end medium inlet of the refrigerator 3 through an outlet pipe 14. The outlet pipe 14 is connected to the circulating water pipeline 15. During use, the condensed water from the circulating water pipeline 15 and the high-temperature medium returned from the reflux main pipe 10 enter the heat exchanger 2 from the inlet pipe 7. A part of the heat source water formed after heat exchange enters the refrigerator 3, and the other part enters the circulating water pipeline 15, and then enters the boiler 1, thereby continuously utilizing the waste heat of the flue gas and saving the steam heat of the boiler 1.

[0033] A serpentine channel is provided in the cooling plate 5, and the medium inlet and the medium outlet are both connected to the serpentine channel, which can appropriately extend the flow time of the low-temperature medium in the cooling plate 5, thereby taking away the heat from the contacting energy storage battery 4.

[0034] Furthermore, there are multiple energy storage batteries 4 and cooling components, and the multiple cooling components are correspondingly arranged on the outer peripheral sides of the multiple energy storage batteries 4, so that the multiple separately stored energy storage batteries 4 can be cooled.

[0035] 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 cooling with liquid cooling, characterized in that: It includes a boiler, a heat exchanger, a refrigerator, an energy storage battery and a cooling assembly, wherein the cooling assembly is arranged on the outer peripheral side of the energy storage battery; The flue outlet of the boiler is connected to the hot-end flue gas inlet of the heat exchanger, the cold-end flue gas outlet of the heat exchanger is connected to a smoke outlet pipe, the cold-end medium inlet of the heat exchanger is connected to an inlet pipe, the hot-end medium outlet of the heat exchanger is connected to the hot-end medium inlet of the refrigerator, the cold-end medium outlet of the refrigerator is connected to the medium inlet of the cooling component, and the medium outlet of the cooling component is connected to the inlet pipe.

2. The energy storage battery thermal management system combining waste heat refrigeration and liquid cooling according to claim 1 is characterized in that: The cooling assembly includes a plurality of cooling plates, and the plurality of cooling plates are attached to the outer side wall of the energy storage battery; The upper end and the lower end of the cooling plate are respectively provided with a medium inlet and a medium outlet, the medium inlet of the cooling plate is communicated with the cold end medium outlet of the refrigerator, and the medium outlet of the cooling plate is communicated with the inlet pipe.

3. The energy storage battery thermal management system combining waste heat cooling and liquid cooling according to claim 2 is characterized in that: The cold end medium outlet of the refrigerator is connected to a supply main pipe, and the inlet pipe is connected to a return main pipe; A supply pipe is connected between the medium inlet of the cooling plate and the supply main pipe, and the supply pipe is provided with a first control valve; A reflux pipe is connected between the medium outlet of the cooling plate and the reflux main pipe, and the reflux pipe is provided with a second control valve.

4. The energy storage battery thermal management system combining waste heat cooling and liquid cooling according to claim 3 is characterized in that: A temperature measuring device is provided on the outer side wall of the energy storage battery where any one of the cooling plates is located.

5. The energy storage battery thermal management system combining waste heat cooling and liquid cooling according to claim 3 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.

6. The energy storage battery thermal management system combining waste heat refrigeration and liquid cooling according to claim 2 is characterized in that: A serpentine channel is arranged in the cooling plate, and the medium inlet and the medium outlet of the cooling plate are both connected to the serpentine channel.

7. The energy storage battery thermal management system combining waste heat cooling and liquid cooling according to any one of claims 1 to 6, characterized in that: There are multiple energy storage batteries and multiple cooling components, and the multiple cooling components are correspondingly arranged on the outer peripheral sides of the multiple energy storage batteries.

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