A valley power cooling system for energy storage battery pack coolant

Abstract

The utility model discloses a kind of valley electricity cooling systems for energy storage battery pack cooling liquid, belong to the field of energy storage battery pack.The device includes separately setting liquid storage tank outside battery pack and water cooling unit, communication between liquid storage tank and water cooling unit, communication between battery pack and liquid storage tank, battery pack internal coolant can enter liquid storage tank, liquid storage tank internal coolant can enter water cooling unit, while temperature sensor is arranged in liquid storage tank, when water cooling unit is stopped at night, battery pack internal coolant can be poured into liquid storage tank internal storage, when cooling water temperature in liquid storage tank is higher than specific value, use water cooling unit to reduce cooling water temperature, reduce coolant temperature through water cooling unit and natural cooling two kinds of ways at night, directly extract liquid storage tank internal coolant when electricity surges, while the coolant temperature in liquid storage tank internal maintenance is located at night, generally at valley electricity period at night, the electricity cost at this time is relatively lower, reduce the electricity fee required when coolant cooling.

Description

Technical Field

[0001] This utility model relates to the field of energy storage battery packs, and in particular to a valley electricity cooling system for energy storage battery pack coolant. Background Technology

[0002] Energy storage battery packs are the basic units of electrochemical energy storage systems. They achieve the storage and release of electrical energy through the series and parallel connection of individual battery cells. The cooling system of energy storage battery packs generally uses circulating coolant (such as ethylene glycol aqueous solution, silicone oil, etc.) to remove the heat generated by battery charging and discharging, maintaining the battery in the optimal operating temperature range of 25-40℃.

[0003] Current energy storage battery pack cooling systems typically use external water-cooled units, with the coolant circulating between the units and the battery pack. Due to lower building electricity consumption and less demand for temperature regulation at night, these units usually stop operating, allowing the coolant to cool naturally. However, the rate of coolant temperature decrease is limited by diurnal temperature variations, building thermal inertia, and localized heat sources (such as the battery pack's continuous self-heating). When peak electricity demand suddenly occurs the following day, the battery pack's heat generation rate far exceeds the natural cooling capacity, leading to uncontrolled coolant temperature rise and necessitating the emergency activation of the water-cooled units for forced cooling. The water-cooled units require a 5-15 minute response delay to recover from standby to full-load operation, involving compressor startup and refrigerant circulation. During this period, the battery pack temperature may exceed safety thresholds, leading to derating or even thermal runaway, forcing the system to adopt an "overcooling compensation" strategy (pre-cooling the coolant to a temperature far below the required level), further increasing energy consumption and resulting in higher overall electricity costs.

[0004] In summary, in the existing technology, the coolant in the energy storage battery pack is naturally cooled when the water-cooled unit is shut down at night. However, when there is a sudden increase in electricity consumption, the naturally cooled coolant cannot meet the needs of the energy storage battery pack, resulting in high energy consumption and high electricity costs for emergency cooling of the water-cooled unit. Utility Model Content

[0005] This invention provides a valley electricity cooling system for the coolant of an energy storage battery pack, which can solve the problem in the prior art where the coolant of the energy storage battery pack is naturally cooled when the water-cooled unit is shut down at night, but the naturally cooled coolant cannot meet the needs of the energy storage battery pack when the electricity consumption suddenly increases, resulting in high energy consumption and high electricity costs for emergency cooling of the water-cooled unit.

[0006] A valley electricity cooling system for coolant in an energy storage battery pack, comprising:

[0007] The battery pack, water-cooled unit, and liquid storage tank are connected together; the liquid storage tank is connected to the water-cooled unit and the battery pack.

[0008] The second three-way valve includes a coolant outlet and a coolant inlet. The coolant inlet of the second three-way valve is connected to a storage tank, and the coolant outlet of the second three-way valve is connected to a water-cooled unit. A temperature sensor is fixedly installed inside the storage tank.

[0009] A two-way valve, one end of which is connected to a liquid storage tank and the other end of which is connected to a battery pack;

[0010] A segmented control system for controlling the flow of coolant in different time periods is provided between the battery pack, the water-cooled unit, and the storage tank.

[0011] Optionally, a water-cooled water pump is fixedly installed inside the water-cooled unit, and the water inlet of the water-cooled water pump is connected to the coolant outlet of the second three-way valve.

[0012] Optionally, a liquid storage pump is fixedly installed inside the liquid storage tank, and one end of the two-way valve is connected to the outlet end of the liquid storage pump.

[0013] Optionally, a first three-way valve is fixedly installed at the outlet end of the water-cooled water pump. The first three-way valve includes a coolant inlet, a coolant outlet one, and a coolant outlet two. The coolant inlet of the first three-way valve is connected to the outlet end of the water-cooled water pump.

[0014] Optionally, the coolant outlet of the first three-way valve is connected to the inlet of the liquid storage pump.

[0015] Optionally, the coolant outlet 2 of the first three-way valve is connected to the battery pack.

[0016] Optionally, the second three-way valve further includes a second coolant inlet, which is connected to the battery pack.

[0017] Optionally, the surfaces of the first three-way valve, the second three-way valve, and the two-way valve are all equipped with electric regulating valves.

[0018] Optionally, the segmented control system includes a PLC controller, the input terminal of which is electrically connected to the temperature sensor.

[0019] Optionally, the output terminal of the PLC controller is connected to the water-cooled water pump via a relay, and the output terminal of the PLC controller is connected to the liquid storage pump via a relay; the PLC controller is electrically connected to the three electric regulating valves.

[0020] This invention provides a cooling system for energy storage battery pack coolant during off-peak hours. It includes a separate storage tank located outside the battery pack and water-cooled unit. The storage tank and water-cooled unit are connected, as are the battery pack and the storage tank. Coolant from the battery pack can enter the storage tank, and coolant from the storage tank can enter the water-cooled unit. A temperature sensor is installed inside the storage tank. When the water-cooled unit is shut down at night, coolant from the battery pack can be poured into the storage tank for storage. When the coolant temperature inside the storage tank exceeds a certain value, the water-cooled unit is used to lower the temperature. Thus, the coolant temperature can be lowered at night through both the water-cooled unit and natural cooling. In case of a sudden surge in electricity demand, coolant is directly drawn from the storage tank, preventing the coolant from re-entering the battery pack after emergency cooling. The coolant temperature inside the storage tank is maintained at nighttime levels, which are generally during off-peak hours when electricity costs are relatively low, thereby reducing the electricity cost for coolant cooling. Attached Figure Description

[0021] Figure 1 A schematic diagram of a valley electricity cooling system for energy storage battery pack coolant provided by this utility model;

[0022] Figure 2 A schematic diagram of the segmented control system provided by this utility model;

[0023] Figure 3 A three-dimensional structural view of the two-way valve provided by this utility model;

[0024] Figure 4 A three-dimensional structural view of the first three-way valve provided by this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Battery pack; 2. Water-cooled unit; 3. Liquid storage tank; 4. Second three-way valve; 5. First three-way valve; 6. Temperature sensor; 7. Water-cooled water pump; 8. Liquid storage pump; 9. Two-way valve; 10. Electric regulating valve. Detailed Implementation

[0027] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0028] like Figures 1 to 4 As shown in the figure, an embodiment of the present invention provides a valley electricity cooling system for the coolant of an energy storage battery pack, comprising:

[0029] The battery pack 1, the water-cooled unit 2, and the liquid storage tank 3 are connected together. The battery pack 1 is connected to the water-cooled unit 2. The liquid storage tank 3 is connected to the water-cooled unit 2 and the battery pack 1 are also connected together.

[0030] The second three-way valve 4 includes a coolant outlet and a coolant inlet. The coolant inlet of the second three-way valve 4 is connected to the storage tank 3, and the coolant outlet of the second three-way valve 4 is connected to the water-cooled unit 2. A temperature sensor 6 is fixedly installed inside the storage tank 3.

[0031] Two-way valve 9, one end of which is connected to liquid storage tank 3, and the other end of which is connected to battery pack 1;

[0032] A segmented control system for controlling the flow of coolant in different time periods is provided between the battery pack 1, the water-cooled unit 2, and the liquid storage tank 3.

[0033] In summary, the present invention provides a battery pack coolant cooling system for off-peak electricity, comprising a separate storage tank 3 outside the battery pack 1 and the water-cooled unit 2. The storage tank 3 is connected to the water-cooled unit 2, and the battery pack 1 is also connected to the storage tank 3. The coolant inside the battery pack 1 can enter the storage tank 3, and the coolant inside the storage tank 3 can enter the water-cooled unit 2. At the same time, a temperature sensor 6 is installed inside the storage tank 3. When the water-cooled unit 2 is shut down at night, the coolant inside the battery pack 1 can be poured into the storage tank 3 for storage. When the temperature of the coolant inside the storage tank 3 is higher than a certain value, the water-cooled unit 2 is used to lower the temperature of the coolant. Thus, at night, the coolant temperature can be lowered through both the water-cooled unit 2 and natural cooling. When there is a sudden increase in electricity consumption, the coolant inside the storage tank 3 is directly drawn to avoid the coolant re-entering the battery pack 1 through emergency cooling. At the same time, the temperature of the coolant inside the storage tank 3 is maintained at the nighttime level, which is generally during off-peak electricity hours, when the electricity cost is relatively low, thereby reducing the electricity cost required for coolant cooling.

[0034] In some specific implementation schemes, a water-cooled water pump 7 is fixedly installed inside the water-cooled unit 2, and the water inlet of the water-cooled water pump 7 is connected to the coolant outlet of the second three-way valve 4. A liquid storage pump 8 is fixedly installed inside the liquid storage tank 3, and one end of the two-way valve 9 is connected to the water outlet of the liquid storage pump 8.

[0035] In a further embodiment, a first three-way valve 5 is fixedly installed at the outlet end of the water-cooled water pump 7. The first three-way valve 5 includes a coolant inlet, a coolant outlet one, and a coolant outlet two. The coolant inlet of the first three-way valve 5 is connected to the outlet end of the water-cooled water pump 7, the coolant outlet one of the first three-way valve 5 is connected to the inlet end of the storage water pump 8, and the coolant outlet two of the first three-way valve 5 is connected to the battery pack 1.

[0036] In a further embodiment, the second three-way valve 4 also includes a second coolant inlet, which is connected to the battery pack 1;

[0037] In some specific implementation schemes, the first three-way valve 5, the second three-way valve 4, and the two-way valve 9 are all provided with electric regulating valves 10;

[0038] It should be noted that the electric regulating valve 10 is composed of an electric actuator and a regulating valve body connected by mechanical connection; its core function is to receive the standard electrical signal output by the control system and drive the cross-sectional area between the valve core and the valve seat to change, thereby accurately controlling the process parameters such as flow rate, temperature, and pressure of the medium in the pipeline.

[0039] In some specific implementations, the segmented control system includes a PLC controller.

[0040] It should be noted that the PLC controller can be programmed to achieve multi-time period timing, conditional linkage, such as starting the water pump when the temperature exceeds the threshold, and remote monitoring.

[0041] The output terminal of the PLC controller is connected to the water-cooled water pump 7 via a relay, and the output terminal of the PLC controller is connected to the liquid storage pump 8 via a relay; the input terminal of the PLC controller is electrically connected to the temperature sensor 6; and the PLC controller is electrically connected to three electric regulating valves 10.

[0042] The working principle of this utility model:

[0043] At night, the coolant inside the battery pack 1 is drawn into the water-cooled unit 2 through the second three-way valve 4. After the coolant temperature drops, it is drawn into the storage tank 3 through the first three-way valve 5 for storage. When the temperature sensor 6 inside the storage tank 3 exceeds the threshold, the coolant inside the storage tank 3 is drawn into the water-cooled unit 2 through the second three-way valve 4. After the coolant temperature drops, it is drawn back into the storage tank 3. When the battery pack 1 is used at high power, the coolant inside the storage tank 3 is drawn into the battery pack 1 directly through the two-way valve 9.

[0044] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A valley electricity cooling system for the coolant of an energy storage battery pack, characterized in that, include: The battery pack (1), the water-cooled unit (2), and the liquid storage tank (3) are connected to the water-cooled unit (2); the liquid storage tank (3) is connected to the water-cooled unit (2) and the battery pack (1). The second three-way valve (4) includes a coolant outlet and a coolant inlet. The coolant inlet of the second three-way valve (4) is connected to the storage tank (3), and the coolant outlet of the second three-way valve (4) is connected to the water-cooled unit (2). A temperature sensor (6) is fixedly installed inside the storage tank (3). Two-way valve (9), one end of which is connected to the liquid storage tank (3), and the other end of which is connected to the battery pack (1); A segmented control system for controlling the flow of coolant in different time periods is provided between the battery pack (1), the water-cooled unit (2), and the liquid storage tank (3).

2. The off-peak electricity cooling system for the coolant of an energy storage battery pack as described in claim 1, characterized in that, The water-cooled unit (2) is equipped with a water-cooled water pump (7), and the water inlet of the water-cooled water pump (7) is connected to the coolant outlet of the second three-way valve (4).

3. The off-peak electricity cooling system for the coolant of an energy storage battery pack as described in claim 2, characterized in that, The storage tank (3) is equipped with a storage water pump (8), and one end of the two-way valve (9) is connected to the outlet end of the storage water pump (8).

4. The off-peak electricity cooling system for the coolant of an energy storage battery pack as described in claim 3, characterized in that, The water-cooled pump (7) is fixedly equipped with a first three-way valve (5) at its outlet end. The first three-way valve (5) includes a coolant inlet, a coolant outlet one, and a coolant outlet two. The coolant inlet of the first three-way valve (5) is connected to the outlet end of the water-cooled pump (7).

5. A valley electricity cooling system for the coolant of an energy storage battery pack as described in claim 4, characterized in that, The coolant outlet of the first three-way valve (5) is connected to the inlet of the liquid storage pump (8).

6. A valley electricity cooling system for energy storage battery pack coolant as described in claim 4, characterized in that, The coolant outlet of the first three-way valve (5) is connected to the battery pack (1).

7. A valley electricity cooling system for the coolant of an energy storage battery pack as described in claim 1, characterized in that, The second three-way valve (4) also includes a second coolant inlet, which is connected to the battery pack (1).

8. A valley electricity cooling system for energy storage battery pack coolant as described in claim 4, characterized in that, Electric regulating valves (10) are provided on the surfaces of the first three-way valve (5), the second three-way valve (4), and the two-way valve (9).

9. A valley electricity cooling system for the coolant of an energy storage battery pack as described in claim 3, characterized in that, The segmented control system includes a PLC controller, the input terminal of which is electrically connected to the temperature sensor (6).

10. A valley electricity cooling system for the coolant of an energy storage battery pack as described in claim 9, characterized in that, The output terminal of the PLC controller is connected to the water-cooled water pump (7) via a relay, and the output terminal of the PLC controller is connected to the liquid storage pump (8) via a relay; the PLC controller is electrically connected to the three electric regulating valves (10).

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