Efficient and stable energy storage heat management system

Abstract

The utility model provides an efficient and stable energy storage thermal management system, which comprises an energy storage battery, the energy storage battery adopts a liquid cooling mode to dissipate heat, and a temperature sensor is arranged in the energy storage battery and is used for measuring the current temperature of the energy storage battery; the energy storage battery, the circulating water pump and the evaporator form a circulating pipeline through a liquid cooling pipeline, and the evaporator and the refrigeration equipment form a circulating pipeline. The utility model has the advantages that the running energy consumption of the water chilling unit is reduced, the energy storage battery is ensured to be at a suitable working temperature for a long time, the service life of the battery is effectively prolonged, and the overall system efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid cooling of energy storage batteries, and in particular to an efficient and stable energy storage thermal management system. Background Art

[0002] Lithium batteries are cooled primarily by air or liquid. Air cooling offers a simpler structure and relatively lower costs, but its cooling performance is poor. Liquid cooling, which uses cooling pipes and cooling plates to dissipate heat from the battery, offers better temperature control.

[0003] However, the current liquid cooling method mainly achieves heat dissipation of the battery temperature by setting and controlling the outlet water temperature of the chiller, which results in energy waste. Utility Model Content

[0004] The purpose of the utility model is to provide an efficient and stable energy storage thermal management system that reduces energy consumption, improves overall system efficiency, and extends battery life.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions:

[0006] An efficient and stable energy storage thermal management system includes an energy storage battery. The energy storage battery uses liquid cooling to dissipate heat. The energy storage battery has a built-in temperature sensor for measuring the current temperature of the energy storage battery. The energy storage battery forms a circulation pipeline with a circulating water pump and an evaporator through a liquid cooling pipeline. The evaporator forms a circulation pipeline with a refrigeration device.

[0007] Furthermore, the refrigeration equipment includes a variable frequency compressor, a condenser, and an electronic expansion valve. The refrigeration equipment and the evaporator form a refrigeration cycle and adjust the refrigeration load by adjusting the frequency of the variable frequency compressor and the opening of the electronic expansion valve, so that the refrigeration load matches the heat released by the charging and discharging of the energy storage battery.

[0008] Furthermore, the liquid cooling pipeline is also provided with a heater.

[0009] Furthermore, the liquid cooling pipeline is also provided with an expansion tank and an exhaust valve for stabilizing the pressure.

[0010] Furthermore, the refrigeration equipment also includes a dryer.

[0011] In actual implementation, an operating temperature of the energy storage battery is set, for example, the operating temperature of the energy storage battery is set to 30°C. According to the above technical solution, the energy storage battery operates within a temperature range of 30°C±1, so that the energy storage battery can be in a suitable operating temperature range for a long time, effectively extending the battery life while also saving energy and reducing consumption.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] Conventional energy storage fluid thermal management control controls the temperature of the energy storage battery by controlling the water supply temperature of the chiller, which is an indirect control form. When controlling the water supply temperature and the temperature of the energy storage battery, there will be a certain amount of waste in the operating energy consumption of the chiller.

[0014] This utility model is an efficient and stable energy storage thermal management system, which adopts direct temperature control of the energy storage battery, can accurately control the operating temperature of the energy storage battery, and achieves accurate control of the energy storage battery temperature by controlling the variable frequency compressor of the chiller at an appropriate frequency and appropriate refrigerant temperature, thereby reducing the operating energy consumption of the chiller, ensuring that the energy storage battery is at an appropriate operating temperature for a long time, effectively extending the battery life, and improving the overall system efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the present utility model.

[0016] Figure numerals: 1. variable frequency compressor; 2. condenser; 3. dryer; 4. electronic expansion valve; 5. evaporator; 6. circulating water pump; 7. heater; 8. expansion tank; 9. exhaust valve; 10. energy storage battery; 11. temperature sensor. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0018] The existing thermal management control of energy storage fluid is to control the temperature of the energy storage battery by controlling the water supply temperature of the chiller, which is an indirect control form.

[0019] like Figure 1 As shown, a highly efficient and stable energy storage thermal management system includes an energy storage battery 10, which uses liquid cooling to dissipate heat. The energy storage battery 10 has a built-in temperature sensor 11 for measuring its current temperature. The energy storage battery 10 forms a circulation pipeline with a circulating water pump 6, an evaporator 5, a heater 7, an expansion tank 8, and an exhaust valve 9 via a liquid cooling pipeline. The evaporator 5, in turn, forms a circulation pipeline with a refrigeration device. The refrigeration device includes a variable frequency compressor 1, a condenser 2, an electronic expansion valve 4, and a dryer 3. The refrigeration device and the evaporator 5 form a refrigeration cycle. The refrigeration load is adjusted by adjusting the frequency of the variable frequency compressor 1 and the opening of the electronic expansion valve 4, ensuring that the refrigeration load matches the heat released by the energy storage battery 10 during charging and discharging.

[0020] Preferably, the expansion tank 8 and the exhaust valve 9 on the liquid cooling pipeline are used to stabilize the pressure.

[0021] The key point of the present invention is to maintain the operating temperature of the energy storage battery 10 at a set value, which mainly depends on the matching of the refrigeration load of the refrigeration equipment and the heat released by the energy storage battery 10 during charging and discharging.

[0022] The specific working principle is as follows: when the thermal management is in cooling mode, the set temperature T0 of the energy storage battery 10 is compared with the current temperature T1 measured by the temperature sensor 11 to obtain the difference t2 (T0-T1=t2). The frequency of the variable frequency compressor 1 is directly controlled by t2 to match the released heat load of the energy storage battery 10; when -1℃≤t2≤1℃, the frequency of the variable frequency compressor 1 will be adjusted at the minimum adjustment frequency within a certain range to maintain t2 within this range; when t2>1℃, the frequency of the variable frequency compressor 1 is gradually increased to make t2 fall within the range of -1℃≤t2≤1℃; when t2<-1℃, the frequency of the variable frequency compressor 1 is gradually reduced until it runs at the minimum frequency to make t2 fall within the range of -1℃≤t2≤1℃; the above control all uses PID regulation as the main adjustment method.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An efficient and stable energy storage thermal management system, including an energy storage battery, which uses liquid cooling to dissipate heat, characterized by: The energy storage battery has a built-in temperature sensor for measuring the current temperature of the energy storage battery; the energy storage battery forms a circulation pipeline with a circulating water pump and an evaporator through a liquid cooling pipeline, and the evaporator forms a circulation pipeline with a refrigeration device.

2. The efficient and stable energy storage thermal management system according to claim 1, characterized in that: The refrigeration equipment includes a variable frequency compressor, a condenser, and an electronic expansion valve. The refrigeration equipment and the evaporator form a refrigeration cycle and adjust the refrigeration load by adjusting the frequency of the variable frequency compressor and the opening of the electronic expansion valve, so that the refrigeration load matches the heat released by the charging and discharging of the energy storage battery.

3. The efficient and stable energy storage thermal management system according to claim 1, characterized in that: The liquid cooling pipeline is also provided with a heater.

4. The efficient and stable energy storage thermal management system according to claim 1, characterized in that: The liquid cooling pipeline is also provided with an expansion tank and an exhaust valve for stabilizing the pressure.

5. The efficient and stable energy storage thermal management system according to claim 2, characterized in that: The refrigeration equipment further comprises a dryer.

Images