CN115000577A - Energy storage cabinet temperature control system and temperature control method - Google Patents

Abstract

The invention relates to the technical field of energy storage cabinets, and discloses a temperature control system and a temperature control method for an energy storage cabinet, comprising a cooling unit, a battery pack, an energy storage converter, an air cooler and a cooling liquid circulation pipeline. The cooling unit includes a condenser The evaporator, the compressor and the evaporator are arranged with the total cooling liquid inlet and the cooling liquid outlet. The cooling liquid circulation pipeline includes the battery pack liquid inlet header, the battery pack liquid outlet header and the connecting pipes. The outlets are connected by the liquid inlet manifold of the battery pack, the liquid inlet of the battery pack and the energy storage converter is connected by the liquid outlet manifold of the battery pack, and the liquid outlet of the energy storage converter and the liquid inlet of the air cooler are connected. The outlet of the air cooler and the total inlet of the coolant are all connected by connecting pipes. The battery pack, the energy storage converter, and the air cooler are connected in sequence through the cooling liquid circulation pipeline. The cooling liquid cools the energy storage converter and the air cooler for heat dissipation, eliminating the need for air cooling equipment, which can reduce the total volume of the energy storage cabinet. ,save space.

Description

A kind of energy storage cabinet temperature control system and temperature control method

technical field

The invention relates to the technical field of energy storage cabinets, in particular to a temperature control system and a temperature control method of an energy storage cabinet.

Background technique

With the vigorous development of energy storage and other industries, electrochemical energy storage has the advantages of high charge and discharge rate, fast response, and easy distribution. It has been widely used in renewable energy, distributed energy, smart grid and other fields. Among them, lithium iron phosphate is used. Electrochemical energy storage represented by energy storage batteries has developed rapidly due to its advantages such as high energy storage density and power density, high efficiency, rapid technological progress, and great development potential. Cabinet-type energy storage system has the advantages of easy installation, small footprint, flexible movement, and short construction period. It is widely used at home and abroad, and has a huge future development space. However, energy storage products need to deal with a variety of different application environments and usage scenarios.

The energy storage cabinet is the basic unit of energy storage equipment, including battery pack, power conversion system, liquid cooling system, fire protection system, control module, etc., an integrated cabinet-type energy storage device. The part where the battery pack is placed is the battery compartment. The part where the power conversion system and the control module are placed is the converter cabin. Temperature is an important factor affecting the capacity and service life of battery systems, among which liquid cooling methods are mostly used in new energy storage products with higher heat dissipation efficiency.

However, usually in an energy storage system, the liquid cooling device is usually arranged in the battery compartment of the energy storage cabinet. The cooling liquid supply main pipe is divided into supply and return branch pipes at each cluster of batteries, and the liquid cooling plate flowing into the battery pack cools the cells. , other electrical equipment in the energy storage cabinet is dissipated by fans, that is, the liquid cooling device is only used to adjust the temperature of the battery pack, ignoring the temperature adjustment requirements of the rest, and other components and cabinets or boxes are cooled by air. In addition, the energy storage system is more complicated due to the addition of air-cooled equipment and the corresponding control and power distribution design, and at the same time, it is impossible to independently adjust the ambient temperature inside the box. When the box is in a harsh external environment, it is easy to cause the ambient temperature in the box to be too high or too low, which is not conducive to the operation of other electrical equipment such as energy storage converters.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a temperature control system for an energy storage cabinet, so as to solve the problem of using air cooling equipment to air-cool the energy storage cabinet in the prior art, resulting in a complex energy storage system and an internal environment unfavorable for other electrical equipment. The problem of operation; the present invention also provides a temperature control method.

In order to achieve the above purpose, the present invention provides a temperature control system for an energy storage cabinet, including a cooling unit, a battery pack, an energy storage converter, an air cooler and a cooling liquid circulation pipeline, and the cooling unit is used for being arranged in an energy storage unit. In the converter cabin of the cabinet, the cooling unit includes a condenser, a compressor and an evaporator connected by pipes, the evaporator is arranged with a total cooling liquid inlet and a cooling liquid outlet, and the cooling liquid circulation pipeline includes The battery pack liquid inlet manifold, the battery pack liquid outlet manifold and connecting pipes are connected between the battery pack and the cooling liquid general outlet through the battery pack liquid inlet manifold, the battery pack and the energy storage converter The liquid inlets are connected through the battery pack liquid outlet manifold, between the liquid outlet of the energy storage converter and the liquid inlet of the air cooler, and between the liquid outlet of the air cooler and the The main cooling liquid inlets are all connected through the connecting pipes.

Preferably, the battery pack liquid inlet manifold and the battery pack liquid outlet manifold are vertically arranged in the battery compartment, and a plurality of battery pack liquid inlet manifolds and the battery pack liquid outlet manifold are vertically spaced apart. A connecting branch pipe is used for connecting with the liquid cooling plate of each battery pack.

Preferably, the connecting branch pipe is a hose.

Preferably, an electric heater is also arranged on the cooling liquid circulation pipeline between the cooling liquid main outlet of the evaporator and the battery pack liquid inlet main pipe.

Preferably, a cooling liquid circulating pump is also arranged on the connecting pipe between the air cooler and the evaporator.

Preferably, the cooling unit further includes a condensing fan arranged at the condenser, the condensing fan is used for blowing air to the outside of the converter cabin, and an electronic expansion device is also connected between the condenser and the evaporator valve.

Preferably, the energy storage converter is arranged at the bottom of the converter compartment, and the air cooler is arranged at the back plate of the converter compartment.

The invention also provides a temperature control method. After the temperature control system is started, the cooling liquid circulating pump runs first, and the temperature control system operates for the first period of time; mode, when the cell temperature is less than or equal to the first set temperature, the electric heater starts, and the coolant circulation pipeline heats the battery pack; when the cell temperature is greater than the first set temperature and the supply liquid temperature is less than or equal to the first set temperature At the second set temperature, the compressor and the condensing fan will not start, and the cooling liquid circulating pump will keep running; when the temperature of the liquid supply is greater than the second set temperature, the condensing fan will first run for a second period of time, and then start the compressor, and the cooling liquid will circulate. The pump remains running and the first set temperature is less than the second set temperature.

Preferably, the first time period is 2 minutes, and the second time period is 15 seconds.

Preferably, the electric heater is interlocked with the compressor power supply, and when one of the electric heater and the compressor is working, the other is stopped.

Compared with the prior art, a temperature control system and a temperature control method for an energy storage cabinet according to an embodiment of the present invention have the beneficial effects that the cooling unit, the battery pack, the energy storage converter, the air cooler, and the battery pack are fed with liquid through the battery pack. The main pipe, the liquid outlet main pipe of the battery pack, and the connecting pipes are connected in sequence. After the cooling liquid cools the battery pack, it can also cool the energy storage converter and the air cooler. Therefore, the temperature of the electrical equipment in the converter cabin of the energy storage cabinet and the internal environment can be effectively adjusted. The system integration is high, no additional air cooling equipment is required, and it is also convenient to control the cooling capacity of the cooling unit. Adjust the temperature of the battery pack and the energy storage converter; at the same time, the cooling unit is arranged in the converter cabin. After omitting the air cooling equipment, the temperature control system is compactly arranged, which can reduce the total volume of the energy storage cabinet and save space.

Description of drawings

Fig. 1 is the principle diagram of the energy storage cabinet temperature control system of the present invention;

FIG. 2 is a schematic structural diagram of the temperature control system of the energy storage cabinet of FIG. 1 .

In the figure, 1. Condenser; 2. Compressor; 3. Evaporator; 4. Condensing fan; 5. Electronic expansion valve; 9. Electric heater; 10. Cooling liquid circulating pump; 11. Cooling unit; 12. Connecting branch pipe; 13. Battery pack; 14. Energy storage converter; 15. Air cooler.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

A preferred embodiment of an energy storage cabinet temperature control system of the present invention, as shown in FIG. 1 and FIG. 2 , the energy storage cabinet temperature control system includes a cooling unit 11, a battery pack 13, an energy storage converter 14, and an air cooler. 15 and the cooling liquid circulation pipeline. The cooling liquid circulation pipeline is used to connect various electrical equipment in the energy storage cabinet. The cooling unit 11 is used to be arranged in the converter cabin of the energy storage cabinet. After omitting the air cooling equipment, the temperature control system The compact layout can reduce the total volume of the energy storage cabinet and save space. The cooling liquid circulation pipeline is arranged on the front of the energy storage cabinet as much as possible to facilitate installation and later maintenance.

The cooling unit 11 includes a condenser 1 , a compressor 2 and an evaporator 3 . The condenser 1 , the compressor 2 and the evaporator 3 are connected by pipes, and the compressor 2 drives the refrigerant to circulate between the condenser 1 and the evaporator 3 . The evaporator 3 is provided with a total cooling liquid inlet and a cooling liquid outlet. The refrigerant of the cooling unit 11 evaporates and absorbs heat on the evaporator 3, and the cooling liquid in the cooling liquid circulation pipeline is cooled by the evaporator 3.

The cooling liquid circulation pipeline includes a battery pack liquid inlet manifold 6, a battery pack liquid outlet manifold 7 and a connecting pipe 8. One end of the battery pack liquid inlet manifold 6 is connected to the cooling liquid outlet of the evaporator 3, and the other end is connected to the battery pack 13. , the battery pack liquid outlet manifold 7 is used to lead the cooling liquid from the battery pack 13, the cooling liquid enters the liquid cooling plate of the battery pack 13 from the battery pack liquid inlet manifold 6, and the battery pack 13 is cooled after passing through the battery pack liquid outlet manifold 7 outflow.

The outlet manifold 7 of the battery pack is in communication with the inlet port of the energy storage converter 14, and the cooling liquid flows out of the battery pack 13 through the outlet manifold 7 of the battery pack and then enters the energy storage converter through the inlet of the energy storage inverter 14. The energy storage converter 14 is cooled and then flows out through the connecting pipe 8 to realize the liquid cooling and temperature control of the energy storage converter 14 .

The battery pack 13 and the liquid inlet of the energy storage converter 14 are connected through the battery pack liquid outlet manifold 7, and between the liquid outlet of the energy storage converter 14 and the liquid inlet of the air cooler 15, the The liquid outlet and the total cooling liquid inlet of the air cooler 15 are connected through the connecting pipe 8 . The cooling liquid flows out through the liquid outlet of the energy storage converter 14 and then enters the air cooler 15 from the liquid inlet of the air cooler 15 through the connecting pipe 8, and the air in the converter cabin is cooled by the air cooler 15, thereby adjusting the exchange rate. The ambient temperature in the flow chamber then flows out from the liquid outlet of the air cooler 15 and enters the evaporator 3 from the total cooling liquid inlet of the evaporator 3 through the connecting pipe 8 to complete a flow cycle. In this embodiment, the cooling liquid is deionized water, and the air cooler 15 is an air/water heat exchanger; in other embodiments, the cooling liquid may also be a glycol solution.

The priority of temperature control in the energy storage cabinet is the battery pack 13, the energy storage converter 14 and the cabin environment, and the flow order of the cooling liquid is the battery pack 13, the energy storage converter 14 and the air cooler 15, and the The priority levels of temperature control are the same, so as to ensure that the temperature control system preferentially controls the temperature of the battery pack 13 and ensures that the cells are at a suitable working temperature.

The cooling unit, the battery pack, the energy storage converter 14, and the air cooler 15 are connected in sequence through the battery pack liquid inlet manifold 6, the battery pack liquid outlet manifold 7, and the connecting pipe 8, and the cooling liquid is cooling the battery pack 13. After that, the energy storage converter 14 and the air cooler 15 can be liquid-cooled and dissipated, and the air cooler 15 can reduce the air temperature in the energy storage cabinet, thereby effectively cooling the electrical equipment in the converter cabin of the energy storage cabinet and the internal environment. For temperature adjustment, the system has a high degree of integration, no additional air cooling equipment is required, and it is also convenient to adjust the temperature of the battery pack and the energy storage converter 14 in real time by controlling the cooling capacity of the cooling unit.

Preferably, the battery pack liquid inlet manifold 6 and the battery pack liquid outlet manifold 7 are vertically arranged in the battery compartment, and the battery pack liquid inlet manifold 6 and the battery pack liquid outlet manifold 7 are vertically spaced with a number of connecting branch pipes 12. The connecting branch pipe 12 is used for connecting with the liquid cooling plate of each battery pack 13 .

The battery packs 13 in the battery compartment are usually arranged in layers, and the battery pack liquid inlet manifold 6 and the battery pack liquid outlet manifold 7 are arranged vertically, and can be connected to the battery pack 13 through each connecting branch pipe 12 respectively, so that the coolant passes through each of the battery packs 13 . The liquid cooling plate of the battery pack 13 cools each battery pack 13 , which simplifies the liquid cooling method of the battery pack 13 .

Preferably, the connecting branch pipe 12 is a hose.

The hose can be properly bent to compensate for the placement error of each battery pack 13 and ensure connection with the liquid cooling plate of the battery pack 13 .

Preferably, an electric heater 9 is also arranged on the cooling liquid circulation pipeline between the cooling liquid main outlet of the evaporator 3 and the battery pack liquid inlet main pipe 6 .

The electric heater 9 is used to heat the cooling liquid to ensure that the cooling liquid will not be supercooled. The working efficiency of the battery cells at low temperature is low and the power conversion efficiency is low. Therefore, in extreme environments, the electric heater 9 needs to be used to heat the cooling liquid to heat the battery pack 13, so that the battery cells can work at a suitable temperature. .

Preferably, a cooling liquid circulating pump 10 is also arranged on the connecting pipe 8 between the air cooler 15 and the evaporator 3 .

The cooling liquid circulation pump 10 is used to provide power for the flow of the cooling liquid, and drive the cooling liquid to flow in the cooling liquid circulation pipeline, so as to cool down the battery pack 13 and various electrical devices.

Preferably, the cooling unit further includes a condensing fan 4 arranged at the condenser 1 , and the condensing fan 4 is used for blowing air to the outside of the converter cabin, and an electronic expansion valve 5 is also connected between the condenser 1 and the evaporator 3 .

The condensing fan 4 is used to transport the heat generated by the condenser 1 to the outside of the battery compartment to improve the heat dissipation efficiency. The electronic expansion valve 5 can adjust the flow rate by controlling the applied voltage or current. According to the different operating conditions of the cells, the output cooling capacity of the cooling unit 11 can be adjusted, and the temperature of the cells and the energy storage converter 14 can be adjusted. Make real-time adjustments.

Preferably, the energy storage converter 14 is arranged at the bottom of the converter compartment, and the air cooler 15 is arranged at the back panel of the converter compartment.

The energy storage converter 14 is arranged at the bottom of the converter cabin, the connection pipe 8 can be connected to the front of the energy storage converter 14, the air cooler 15 is arranged at the back plate of the converter cabin, and the connection pipe 8 is connected to the air cooler 15 It is convenient to repair and maintain the pipeline, and at the same time, the layout of the temperature control system is compact, which can reduce the total volume of the energy storage cabinet and save the space for product use.

The present invention also provides a temperature control method, that is, the working method of the energy storage cabinet temperature control system in the above-mentioned embodiment. After the temperature control system is started, the cooling liquid circulating pump 10 operates first, and the temperature control system operates for the first period of time. ;The temperature control system judges the working mode according to the cell temperature and the supply temperature of the cooling liquid. When the cell temperature is less than or equal to the first set temperature, the electric heater starts, and the cooling liquid circulation pipeline heats the battery pack; When the cell temperature is greater than the first set temperature and the liquid supply temperature is less than or equal to the second set temperature, the compressor 2 and the condensing fan 4 do not start, and the cooling liquid circulating pump 10 keeps running; when the liquid supply temperature is greater than the second set temperature When the temperature is fixed, the condensing fan 4 runs for a second period of time, then starts the compressor 2, and the coolant circulation pump 10 keeps running. When the cell temperature is less than or equal to the set temperature, the electric heater 9 starts, and the first set The temperature is lower than the second set temperature.

In this embodiment, when the temperature control is started, the cooling liquid circulating pump 10 first enters the self-circulation temperature equalization mode after running, and the first time period of operation can equalize the cooling liquid temperature everywhere in the cooling liquid circulating pipeline.

Before the compressor 2 is started, the condensing fan 4 runs first for a second period of time, which can radiate heat to the condenser 1 first, thereby improving the working efficiency of the condenser 1 . When the temperature of the cell is lower than the first set temperature, the electric heater 9 is used to heat the cooling liquid, which can heat the cell to ensure that the cooling liquid will not be overcooled and ensure the working temperature of the cell.

In this embodiment, the working mode of the temperature control system is adjusted in real time according to the temperature of the battery cell and the temperature of the liquid supply, which can ensure that the battery cell is in a suitable working environment. When the cell temperature is greater than the first set temperature and the supply liquid temperature is lower than or equal to the second set temperature, only the cooling liquid circulating pump 10 works, the compressor 2 and the condensing fan 4 do not start, and the cooling unit 11 can be reduced. work consumption.

The specific values of the first set temperature and the second set temperature depend on the characteristics of the battery cells, which are not described in detail in this application.

Preferably, the first time period is 2 minutes and the second time period is 15 seconds.

Preferably, the electric heater 9 is interlocked with the power supply of the compressor 2, and when one of the electric heater 9 and the compressor 2 is working, the other is stopped.

After the power supply of the electric heater 9 and the compressor 2 are interlocked, they will not be turned on at the same time, which can protect the temperature control system and avoid the heating phenomenon while cooling the coolant.

Preferably, through the control of the compressor 2 and the electronic expansion valve 5, the real-time control of the cooling capacity can be realized, and the temperature of the cooling liquid can be precisely controlled to ensure that the output cooling capacity of the cooling unit 11 achieves the purpose of controlling the temperature of the cooling liquid.

To sum up, the embodiments of the present invention provide a temperature control system and a temperature control method for an energy storage cabinet, wherein the cooling unit, the battery pack, the energy storage converter, and the air cooler are connected through the battery pack liquid inlet header, the battery pack liquid outlet header, and the The pipes are connected in sequence. After the cooling liquid cools the battery pack, it can cool the energy storage converter and the air cooler. The air cooler can reduce the air temperature in the energy storage cabinet, thereby effectively cooling the storage tank. The temperature of the electrical equipment in the converter cabin of the energy cabinet and the internal environment are regulated. The system is highly integrated and does not require additional air cooling equipment. It is also convenient to adjust the battery pack and energy storage converter in real time by controlling the cooling capacity of the cooling unit. At the same time, the cooling unit is arranged in the converter cabin, after omitting the air cooling equipment, the temperature control system is compactly arranged, which can reduce the total volume of the energy storage cabinet and save space.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. The temperature control system of the energy storage cabinet is characterized by comprising a cooling unit, a battery pack, an energy storage converter, an air cooler and a cooling liquid circulating pipeline, the cooling unit is arranged in a converter cabin of the energy storage cabinet and comprises a condenser, a compressor and an evaporator which are connected through pipelines, the evaporator is provided with a cooling liquid main inlet and a cooling liquid main outlet, the cooling liquid circulating pipeline comprises a battery pack liquid inlet main pipe, a battery pack liquid outlet main pipe and a connecting pipeline, the battery pack is connected with the cooling liquid main outlet through the battery pack liquid inlet main pipe, the battery pack is connected with the liquid inlet of the energy storage converter through the battery pack liquid outlet main pipe, the liquid outlet of the energy storage converter is connected with the liquid inlet of the air cooler, and the liquid outlet of the air cooler is connected with the cooling liquid main inlet through the connecting pipelines.

2. The energy storage cabinet temperature control system of claim 1, wherein the battery pack inlet manifold and the battery pack outlet manifold are vertically arranged in the battery compartment, a plurality of connecting branch pipes are vertically arranged on the battery pack inlet manifold and the battery pack outlet manifold at intervals, and the connecting branch pipes are used for being connected with the liquid cooling plates of the battery packs.

3. The energy storage cabinet temperature control system of claim 2, wherein the connection manifold is a hose.

4. The energy storage cabinet temperature control system of any one of claims 1-3, wherein an electric heater is further arranged on a coolant circulation line between a coolant main outlet of the evaporator and a battery pack inlet manifold.

5. The energy storage cabinet temperature control system according to any one of claims 1 to 3, wherein a coolant circulating pump is further arranged on a connecting pipeline between the air cooler and the evaporator.

6. The energy storage cabinet temperature control system according to any one of claims 1 to 3, wherein the cooling unit further comprises a condensing fan arranged at the condenser, the condensing fan is used for blowing air to the outside of the converter compartment, and an electronic expansion valve is further connected between the condenser and the evaporator.

7. The energy storage cabinet temperature control system according to any one of claims 1 to 3, wherein the energy storage converter is arranged at the bottom of the converter compartment and the air cooler is arranged at the back plate of the converter compartment.

8. The temperature control method of the energy storage cabinet temperature control system of any one of claims 1-7, wherein after the temperature control system is started, the cooling liquid circulating pump is operated first, and the temperature control system is operated for a first time period; the temperature control system judges the working mode according to the temperature of the battery cell and the liquid supply temperature of the cooling liquid, when the temperature of the battery cell is less than or equal to a first set temperature, the electric heater is started, and the cooling liquid circulation pipeline heats the battery pack; when the temperature of the battery cell is higher than a first set temperature and the temperature of the liquid supply is lower than or equal to a second set temperature, the compressor and the condensing fan are not started, and the cooling liquid circulating pump keeps running; when the liquid supply temperature is higher than a second set temperature, the condensing fan operates for a second time period, then the compressor is started, the cooling liquid circulating pump keeps operating, and the first set temperature is lower than the second set temperature.

9. The temperature control method according to claim 8, wherein the first period of time is 2 minutes and the second period of time is 15 seconds.

10. The temperature control method of claim 8, wherein the electric heater is interlocked with a power supply of the compressor, and one of the electric heater and the compressor is operated while the other is stopped.

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