Energy storage system and heat management device of energy storage system

Abstract

The utility model discloses a thermal management device of an energy storage system, which is characterized in that a liquid storage tank is connected with a liquid cooling battery pack, a liquid cooling host is connected with the liquid storage tank, and a controller is connected with the liquid storage tank and the liquid cooling host. The controller controls the liquid storage tank to cool the liquid-cooled battery pack when the external temperature is within a first temperature range, recovers the post-cooling liquid generated after cooling to the liquid storage tank to store to realize heat storage when the external temperature is within a second temperature range, and recovers the post-cooling liquid to the liquid storage tank to store to realize heat storage when the external temperature is within a third temperature range in a valley electricity stage. The liquid cooling host is controlled to refrigerate cooling liquid in a liquid storage tank to achieve cold storage, heating is conducted to achieve heat storage when the external temperature is within a fourth temperature range, and the minimum temperature value of the first temperature range is larger than the maximum temperature value of the second temperature range. The minimum temperature value of the third temperature range is larger than the maximum temperature value of the fourth temperature range, energy consumption and operation cost are reduced, power utilization peaks are staggered, and power utilization cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system technology, and in particular to an energy storage system and an energy storage system thermal management device. Background Technology

[0002] Energy storage systems play a vital role in grid balancing and emergency power supply. However, energy storage batteries generate a significant amount of heat during high-power charging and discharging. If this heat is not managed effectively and promptly, it can lead to performance degradation, shortened lifespan, and even safety issues.

[0003] In existing heat dissipation methods, a direct-mount structure for the liquid cooling unit is used, where the liquid cooling unit is directly connected to the liquid cooling plate. After the system is turned on according to the temperature, the liquid cooling unit needs to run at high power continuously, which consumes a lot of electricity and makes the overall operating cost high.

[0004] Therefore, there is a need to develop an advanced, low-operating-cost thermal management system to reduce operating costs. Utility Model Content

[0005] The purpose of this invention is to provide an energy storage system and an energy storage system thermal management device, which achieves precise control of the temperature of the energy storage battery and optimization of energy consumption through cold storage, heat storage and intelligent temperature control, thereby reducing operating costs.

[0006] To address the aforementioned technical problems, this utility model provides a thermal management device for an energy storage system, comprising a storage tank connected to a liquid-cooled battery pack, a liquid-cooling host connected to the storage tank, a controller connected to the storage tank and the liquid-cooling host, and a temperature sensor connected to the controller for detecting the external ambient temperature. The controller is configured to control the storage tank to supply coolant to the liquid-cooled battery pack to cool it when the external temperature detected by the temperature sensor is within a first temperature range; and to recover the high-temperature coolant generated after cooling the liquid-cooled battery pack into the storage tank for heat storage when the external temperature is within a second temperature range. During off-peak electricity periods, the controller controls the liquid-cooling host to cool the coolant in the storage tank when the external temperature is within a third temperature range to achieve cold storage, and to heat the coolant when the external temperature is within a fourth temperature range to achieve heat storage. The minimum temperature value in the first temperature range is greater than the maximum temperature value in the second temperature range, and the minimum temperature value in the third temperature range is greater than the maximum temperature value in the fourth temperature range.

[0007] The system also includes a first control valve disposed between the liquid-cooled battery pack and the liquid storage tank, and a second control valve disposed between the liquid storage tank and the liquid cooling unit. The first control valve is used to be in an open state during the heat exchange between the liquid storage tank and the liquid-cooled battery pack controlled by the controller, and in a closed state during the heat exchange between the liquid storage tank and the liquid cooling unit. The second control valve is used to be in a closed state during the heat exchange between the liquid storage tank and the liquid-cooled battery pack controlled by the controller, and in an open state during the heat exchange between the liquid storage tank and the liquid cooling unit.

[0008] It also includes a parameter setter connected to the controller, used to set the first temperature range, the second temperature range, and the data range for the off-peak electricity period.

[0009] The controller is a microcontroller or a PLC controller, and the first control valve and the second control valve are one-way solenoid valves.

[0010] The system also includes a battery pack temperature sensor installed in the liquid-cooled battery pack for detecting the battery temperature of the liquid-cooled battery pack. The controller controls the temperature and flow rate of the coolant entering the liquid-cooled battery pack from the storage tank according to the battery temperature and preset cooling rules.

[0011] It also includes a display connected to the controller, the temperature sensor, the liquid storage tank, the liquid cooling host, and the battery pack temperature sensor, for displaying the real-time control commands of the controller, the first control valve, the second control valve, the temperature and flow rate of the coolant in the liquid storage tank, the operating status of the liquid cooling host, the external ambient temperature, and the battery temperature.

[0012] The system also includes a communication module connected to the controller. The communication module includes at least one of a 4G module, a 5G module, and a Wi-Fi module. The communication module is used to receive external commands and control the operating status of the corresponding components through the controller, or to output the operating data of the corresponding components.

[0013] The liquid-cooled battery packs are connected in series or in parallel, and the liquid-cooled battery packs are of equal size and have the same capacity.

[0014] In addition, embodiments of this application also provide an energy storage system applied to the thermal management device of the energy storage system as described above, including a liquid storage tank connected to a liquid-cooled battery pack and a liquid cooling host connected to the liquid storage tank.

[0015] The thermal management device for energy storage systems provided in this embodiment of the invention has the following advantages compared with the prior art:

[0016] The thermal management device for an energy storage system provided in this embodiment connects to a liquid-cooled battery pack via a storage tank, a liquid-cooling unit via the storage tank, and a controller via the storage tank and the liquid-cooling unit. A temperature sensor detects the external ambient temperature. When the external temperature is within a first temperature range, the controller controls the storage tank to cool the liquid-cooled battery pack. When the external temperature is within a second temperature range, the generated coolant is recovered back to the storage tank for heat storage. During off-peak electricity periods, the liquid-cooling unit is controlled to cool or heat the coolant in the storage tank. Through the cooling and heating cycle of the storage tank and intelligent temperature control, the energy consumption and operating costs of the energy storage system are significantly reduced. Peak electricity demand is avoided, reducing electricity costs. The operating time of the liquid-cooling unit is extended, reducing the power requirements of the liquid-cooling unit and lowering equipment costs. The thermal management strategy is automatically adjusted according to different operating conditions and needs to meet the usage requirements of different application scenarios. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the structure of an embodiment of the thermal management device for an energy storage system provided by this utility model;

[0019] Figure 2 A schematic diagram of the structure of an embodiment of the energy storage system provided by this utility model;

[0020] Among them, 10-liquid-cooled battery pack, 20-liquid storage tank, 30-liquid-cooling host, 40-first control valve, 50-second control valve, and 60-controller. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please refer to Figures 1-2 , Figure 1 A schematic diagram of the structure of an embodiment of the thermal management device for an energy storage system provided by this utility model; Figure 2 A schematic diagram of an embodiment of the energy storage system provided by this utility model.

[0023] In one specific embodiment, the thermal management device of the energy storage system includes a liquid storage tank 20 connected to a liquid-cooled battery pack 10, a liquid cooling host 30 connected to the liquid storage tank 20, a controller connected to the liquid storage tank 20 and the liquid cooling host 30, and a temperature sensor connected to the controller for detecting the external ambient temperature. The controller is configured to control the liquid storage tank 20 to supply coolant to the liquid-cooled battery pack 10 to cool it when the external temperature detected by the temperature sensor is within a first temperature range; and to recover the high-temperature coolant generated after cooling the liquid-cooled battery pack 10 into the liquid storage tank for heat storage after the external temperature is within a second temperature range. During off-peak electricity periods, the controller controls the liquid cooling host 30 to cool the coolant in the liquid storage tank 20 when the external temperature is within a third temperature range to achieve cold storage, and to heat the coolant when the external temperature is within a fourth temperature range to achieve heat storage. The minimum temperature value of the first temperature range is greater than the maximum temperature value of the second temperature range, and the minimum temperature value of the third temperature range is greater than the maximum temperature value of the fourth temperature range.

[0024] By connecting the liquid-cooled battery pack 10 to the liquid storage tank 20, the liquid cooling host 30 to the liquid storage tank 20, and the controller to the liquid storage tank 20 and the liquid cooling host 30, a temperature sensor is used to detect the external ambient temperature. When the external temperature is within a first temperature range, the controller controls the liquid storage tank 20 to cool the liquid-cooled battery pack 10. When the external temperature is within a second temperature range, the coolant generated after cooling is recovered into the liquid storage tank 20 for storage to achieve heat storage. During off-peak electricity periods, the controller controls the liquid cooling host 30 to cool or heat the coolant in the liquid storage tank 20. Through the cooling and heating cycle of the liquid storage tank 20 and intelligent temperature control, the energy consumption and operating cost of the energy storage system are significantly reduced. Peak electricity demand is avoided, reducing electricity costs. The working time of the liquid cooling host 30 is reduced, the power requirements of the liquid cooling host 30 are reduced, and the equipment cost is reduced. The thermal management strategy is automatically adjusted according to different operating conditions and needs to meet the usage requirements of different application scenarios.

[0025] In this application, the liquid cooling host can be stopped or operated at low power. It includes a compressor and a circulation pump. The compressor and circulation pump can be turned on at the same time, or only the circulation pump can be turned on. The temperature is then monitored to determine whether the compressor needs to be turned on at the same time. This method reduces power consumption and operating costs.

[0026] To further improve the precise control of the temperature of the liquid-cooled battery pack 10, a first control valve 40 disposed between the liquid-cooled battery pack 10 and the liquid storage tank 20, and a second control valve 50 disposed between the liquid storage tank 20 and the liquid cooling host 30, can be implemented. The first control valve 40 is used to be in an open state during the heat exchange between the liquid storage tank 20 and the liquid-cooled battery pack 10 controlled by the controller, and in a closed state during the heat exchange between the liquid storage tank 20 and the liquid cooling host 30. The second control valve 50 is used to be in a closed state during the heat exchange between the liquid storage tank 20 and the liquid-cooled battery pack 10 controlled by the controller, and in an open state during the heat exchange between the liquid storage tank 20 and the liquid cooling host 30.

[0027] By setting a first control valve 40 between the liquid-cooled battery pack 10 and the liquid storage tank 20, and a second control valve 50 between the liquid storage tank 20 and the liquid cooling host 30, precise control of the coolant flow direction can be achieved, preventing cooling system malfunctions, improving the utilization efficiency of the coolant, increasing the temperature control accuracy of the liquid-cooled battery pack 10, and improving control efficiency.

[0028] To further adapt the device to different environments and seasons, in one embodiment, the thermal management device of the energy storage system also includes a parameter setter connected to the controller, used to set the first temperature range, the second temperature range, and the data range for the off-peak electricity period.

[0029] By setting the parameter settings, you can customize the operating temperature range, time range, and other settings of the device, so that the device can operate in different time periods, such as summer and winter, and in different environments, such as tropical and frigid zones.

[0030] This application does not limit the parameter setting method of the parameter setter. It can be a direct on-site data input method, a remote data input method, a direct data input method, a selection from existing modes, or the use of different storage chips to directly update the data in the storage chips to the parameter setter, or other methods.

[0031] In this application, the type of controller and control valve is not specified. The controller is a microcontroller controller or a PLC controller, and the first control valve 40 and the second control valve 50 are one-way solenoid valves.

[0032] To further achieve accurate temperature control for different battery packs, in one embodiment, the energy storage system thermal management device further includes a battery pack temperature sensor installed in the liquid-cooled battery pack 10 for detecting the battery temperature of the liquid-cooled battery pack 10. The controller controls the temperature and flow rate of the coolant from the storage tank 20 entering the liquid-cooled battery pack 10 according to the battery temperature and preset cooling rules.

[0033] By setting a battery pack temperature sensor to detect the battery temperature of the liquid-cooled battery pack 10, the controller controls the temperature and flow rate of the coolant entering the liquid-cooled battery pack 10 from the storage tank 20 according to the battery temperature and preset cooling rules, so as to achieve precise control of the battery pack temperature.

[0034] The cooling rules in this application are cooling rules set by the user according to their own cooling needs, such as the temperature range of the battery pack, the temperature change range of the battery pack per unit time, and even the type of coolant and the flow rate of the coolant.

[0035] To further improve the management efficiency of the entire device, in one embodiment, the thermal management device of the energy storage system further includes a display connected to the controller, the temperature sensor, the liquid storage tank 20, the liquid cooling host 30, and the battery pack temperature sensor, for displaying the real-time control commands of the controller, the first control valve 40, the second control valve 50, the temperature and flow rate of the coolant in the liquid storage tank 20, the operating status of the liquid cooling host 30, the external ambient temperature, and the battery temperature.

[0036] The display shows the corresponding operating data, control commands, etc., which improves the management efficiency of the equipment.

[0037] This application does not limit the type of display or the display method.

[0038] To further improve data acquisition efficiency and device control efficiency, in one embodiment, the energy storage system thermal management device further includes a communication module connected to the controller. The communication module includes at least one of a 4G module, a 5G module, and a Wi-Fi module. The communication module is used to receive external commands and control the operating status of corresponding components through the controller, or to output the operating data of corresponding components.

[0039] By setting up a communication module, remote device control and remote information acquisition can be achieved, improving control efficiency.

[0040] This application does not limit the type of communication module or the installation method.

[0041] The main purpose of this application is to cool the battery pack. There are no restrictions on the type of battery pack or the circuit connection relationship between the battery packs. In one embodiment, multiple liquid-cooled battery packs 10 are connected in series or in parallel. The multiple liquid-cooled battery packs 10 are of equal size and have the same capacity.

[0042] In one embodiment, the thermal management device for the energy storage system is used as follows:

[0043] Nighttime cold / heat storage: During off-peak electricity hours at night, the cold / heat storage cycle is activated, and the liquid-cooled air conditioning unit starts working. Through components such as the liquid storage tank 20, the liquid-cooled main unit 30 (compressor and circulation pump work simultaneously), and the first one-way solenoid valve, the liquid in the liquid storage tank 20 is cooled or heated to the preset temperature range. At this time, the second one-way solenoid valve is closed.

[0044] Daytime Heat Exchange: During daytime operation, coolant circulation is controlled according to the actual temperature requirements of the energy storage battery. At this time, the first solenoid valve is closed, and the coolant flows through the storage tank 20, the liquid cooling unit 30 (the compressor is not working, only the circulation pump is operating), and the second one-way solenoid valve to the liquid-cooled battery pack 10. The first solenoid valve is closed at this time, absorbing heat generated by the battery or releasing cooling energy to the battery, thus achieving precise control of the battery temperature. When the battery temperature rises, the coolant absorbs heat and flows back to the storage tank 20 for storage; when the battery temperature drops (such as in winter or low-temperature environments), the coolant releases heat to warm the battery.

[0045] The first one-way solenoid valve in this application is a control path for capacity exchange between the liquid storage tank 20 and the liquid cooling unit 30. Nighttime cold / heat storage is achieved by the liquid cooling unit 30 heating or cooling the liquid in the liquid storage tank 20.

[0046] The second one-way solenoid valve facilitates heat exchange between the liquid-cooled battery pack 10 and the liquid storage tank 20, absorbing heat generated by the battery or releasing heat to the battery. (It absorbs heat generated by the battery in summer and releases heat to the battery in winter).

[0047] Multiple liquid-cooled batteries are typically used in series, and there is usually no situation where individual battery packs have different usage frequencies, so individual control is not necessary. However, if there are scenarios where the liquid-cooled battery packs 10 are used in parallel, then individual temperature control can be considered.

[0048] Both the liquid-cooled battery pack 10 and the liquid storage tank 20 have temperature sensors. Temperature control is also based on the temperature feedback from the battery pack and the liquid storage tank 20. The temperature control strategy for the liquid storage tank 20 is 10~18℃ in summer and 35~45℃ in winter. The temperature control strategy for the battery pack is 25~35℃.

[0049] A partially automatic control strategy is implemented by detecting the external ambient temperature. In summer, cooling is used to lower the liquid temperature inside storage tank 20. In winter, heating is used to increase the liquid temperature inside storage tank 20.

[0050] In addition, embodiments of this application also provide an energy storage system applied to the thermal management device of the energy storage system as described above, including a liquid storage tank connected to a liquid-cooled battery pack and a liquid cooling host connected to the liquid storage tank.

[0051] Since the energy storage system described above is applied to the thermal management device of the energy storage system as described above, it has the same beneficial effects, which will not be elaborated upon in this application.

[0052] In summary, the energy storage system and thermal management device provided by this utility model embodiment connect a liquid-cooled battery pack to a storage tank, a liquid-cooling host to the storage tank, and a controller to the storage tank and the liquid-cooling host. A temperature sensor detects the external ambient temperature. When the external temperature is within a first temperature range, the controller controls the storage tank to cool the liquid-cooled battery pack. When the external temperature is within a second temperature range, the generated coolant is recovered back to the storage tank for heat storage. During off-peak electricity periods, the liquid-cooling host is controlled to cool or heat the coolant in the storage tank. Through the cooling and heating cycle of the storage tank and intelligent temperature control, the energy consumption and operating costs of the energy storage system are significantly reduced. Peak electricity demand is avoided, reducing electricity costs. The operating time of the liquid-cooling host is extended, reducing the power requirements of the liquid-cooling host and lowering equipment costs. The thermal management strategy is automatically adjusted according to different operating conditions and needs to meet the usage requirements of different application scenarios.

[0053] The energy storage system and thermal management device provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A thermal management device for an energy storage system, characterized in that, The device includes a storage tank connected to a liquid-cooled battery pack, a liquid-cooling unit connected to the storage tank, a controller connected to the storage tank and the liquid-cooling unit, and a temperature sensor connected to the controller for detecting the external ambient temperature. The controller is used to control the storage tank to supply coolant to the liquid-cooled battery pack to cool it when the external temperature detected by the temperature sensor is within a first temperature range, and to recover the high-temperature coolant generated after cooling the liquid-cooled battery pack back to the storage tank for heat storage when the external temperature is within a second temperature range. During off-peak electricity periods, the controller controls the liquid-cooling unit to cool the coolant in the storage tank when the external temperature is within a third temperature range to achieve cold storage, and to heat the coolant when the external temperature is within a fourth temperature range to achieve heat storage. The minimum temperature value in the first temperature range is greater than the maximum temperature value in the second temperature range, and the minimum temperature value in the third temperature range is greater than the maximum temperature value in the fourth temperature range.

2. The thermal management device for an energy storage system as described in claim 1, characterized in that, It also includes a first control valve disposed between the liquid-cooled battery pack and the liquid storage tank, and a second control valve disposed between the liquid storage tank and the liquid cooling host. The first control valve is used to be in an open state during the heat exchange between the liquid storage tank and the liquid-cooled battery pack controlled by the controller, and in a closed state during the heat exchange between the liquid storage tank and the liquid cooling host. The second control valve is used to be in a closed state during the heat exchange between the liquid storage tank and the liquid-cooled battery pack controlled by the controller, and in an open state during the heat exchange between the liquid storage tank and the liquid cooling host.

3. The thermal management device for an energy storage system as described in claim 2, characterized in that, It also includes a parameter setter connected to the controller, used to set the first temperature range, the second temperature range, and the data range for the off-peak electricity phase.

4. The thermal management device for an energy storage system as described in claim 3, characterized in that, The controller is a microcontroller or a PLC controller, and the first control valve and the second control valve are one-way solenoid valves.

5. The thermal management device for an energy storage system as described in claim 4, characterized in that, It also includes a battery pack temperature sensor installed in the liquid-cooled battery pack for detecting the battery temperature of the liquid-cooled battery pack. The controller controls the temperature and flow rate of the coolant entering the liquid-cooled battery pack from the storage tank according to the battery temperature and preset cooling rules.

6. The thermal management device for an energy storage system as described in claim 5, characterized in that, It also includes a display connected to the controller, the temperature sensor, the liquid storage tank, the liquid cooling host, and the battery pack temperature sensor, for displaying the real-time control commands of the controller, the first control valve, the second control valve, the temperature and flow rate of the coolant in the liquid storage tank, the operating status of the liquid cooling host, the external ambient temperature, and the battery temperature.

7. The thermal management device for an energy storage system as described in any one of claims 1-6, characterized in that, It also includes a communication module connected to the controller. The communication module includes at least one of a 4G module, a 5G module, and a Wi-Fi module. The communication module is used to receive external instructions and control the operating status of the corresponding component through the controller, or to output the operating data of the corresponding component.

8. The thermal management device for an energy storage system as described in claim 7, characterized in that, Multiple liquid-cooled battery packs are connected in series or in parallel, and the multiple liquid-cooled battery packs are of equal size and have the same capacity.

9. An energy storage system, characterized in that, The thermal management device for the energy storage system as described in any one of claims 1-8 includes a liquid storage tank connected to a liquid-cooled battery pack and a liquid cooling host connected to the liquid storage tank.

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