Energy storage heat management system and energy storage device

Abstract

The utility model belongs to the technical field of energy storage systems, and discloses an energy storage heat management system and an energy storage device, the energy storage heat management system comprises a water storage tank, a heat management waterway and a fire fighting waterway; wherein an anti-freezing solution is stored in the water storage tank; the heat management water path is communicated with a battery heat exchanger provided with a plurality of battery packs, an inlet of the heat management water path is communicated with a liquid outlet of the water storage tank, and an outlet of the battery heat exchanger is communicated with a liquid return port of the water storage tank, so that the anti-freezing solution circularly flows in each battery heat exchanger; an inlet of the fire-fighting waterway is communicated with a liquid outlet of the water storage tank; the fire-fighting waterway is provided with a plurality of communicating ports, the communicating ports are communicated with the inner cavities of the battery packs in a one-to-one correspondence manner, control valves are arranged at the communicating ports, and the control valves are configured to control opening and closing of the communicating ports, so that the inner cavities of the corresponding battery packs are filled with anti-freezing liquid. According to the energy storage heat management system, rapid fire extinguishing of the energy storage device is achieved, safety is improved, and the maintenance period of the energy storage heat management system is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage systems, and in particular to an energy storage thermal management system and an energy storage device. Background Art

[0002] Energy storage systems are devices that can store excess energy and release it when needed. In the field of new energy, energy storage systems are widely used in the storage and utilization of energy such as solar energy and wind energy. However, there are certain safety risks in the operation of energy storage systems, the most prominent of which is fire accidents; once a fire occurs, it will not only damage the energy storage system itself, but may also have a major impact on the entire new energy system.

[0003] Therefore, in order to ensure the safe operation of the energy storage system and reduce the probability of fire accidents, the prior art usually installs a fire extinguishing device in the energy storage system. When the thermal runaway of the battery in the corresponding battery pack causes a fire, the fire extinguishing device is used to spray the fire extinguishing medium to extinguish the fire; however, since the burning batteries are all inside the battery pack, traditional fire extinguishing media, such as heptafluoropropane, dry powder, water, etc., cannot effectively and quickly suppress the thermal runaway of the batteries in the battery pack from the outside, and may also cause damage to the equipment. In the prior art, a fire-fighting pipeline system is also set up in the energy storage system corresponding to each battery pack. After a fire occurs in a battery pack, the corresponding opening of the fire-fighting pipeline system will spray water or other fire-fighting liquids for one-to-one individual fire extinguishing. However, setting up a fire-fighting pipeline system separately in the energy storage system is not only costly, large in size, difficult to install, and requires a water source; it also occupies the space of the energy storage system.

[0004] Therefore, there is an urgent need for an energy storage thermal management system and an energy storage device to solve the above technical problems. Utility Model Content

[0005] One purpose of the utility model is to provide an energy storage thermal management system, which can be equipped with a fire water tank in the thermal management system to implement fire fighting measures in the energy storage system, improve safety, and does not require a water supply system. It has flexible configuration and strong adaptability, reduces the cost and space occupation of the fire fighting structure installation, and can also automatically replenish the thermal management circulation system, thereby extending the maintenance period of the energy storage thermal management system.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Energy storage thermal management system, including:

[0008] A water storage tank, wherein antifreeze is stored in the water storage tank;

[0009] A thermal management water circuit, wherein the thermal management water circuit is connected to a battery heat exchanger provided with a plurality of battery packs, the inlet of the thermal management water circuit is connected to the liquid outlet of the water storage tank, and the outlet of the battery heat exchanger is connected to the liquid return port of the water storage tank, so that the antifreeze liquid circulates in each of the battery heat exchangers;

[0010] A fire-fighting water circuit, wherein the inlet of the fire-fighting water circuit is connected to the liquid outlet of the water storage tank; the fire-fighting water circuit is provided with a plurality of connecting ports, each of which is connected to the inner cavity of the battery pack in a one-to-one correspondence, and a control valve is provided at the connecting port, and the control valve is configured to control the opening and closing of the connecting port so that the corresponding inner cavity of the battery pack is filled with antifreeze liquid.

[0011] Optionally, the fire water circuit further includes a plurality of exhaust valves, which are respectively arranged on the box of the battery pack, and are used to reduce the pressure inside the battery pack so that the antifreeze liquid can enter the inner cavity of the battery pack from the connecting port.

[0012] Optionally, the exhaust valve is a normally closed exhaust valve.

[0013] Optionally, the fire water channel further includes a plurality of temperature detectors, and the temperature detectors are arranged one by one in the battery pack to detect the temperature of the battery pack.

[0014] Optionally, the control valve is a normally closed solenoid valve.

[0015] Optionally, the liquid outlet of the water storage tank, the inlet of the fire-fighting water circuit and the inlet of the thermal management water circuit are connected via a first three-way pipe.

[0016] Optionally, the water storage tank includes an expansion water tank and a fire water tank, the expansion water tank is connected to the fire water tank, both the expansion water tank and the fire water tank store the antifreeze, the expansion water tank is used for the circulation of the antifreeze in the thermal management water circuit, and the fire water tank is used for the supply of the antifreeze to the fire water circuit.

[0017] Optionally, a circulating water pump is also included, and the circulating water pump is arranged at the liquid outlet of the water storage tank.

[0018] Optionally, the capacity of the antifreeze liquid in the water storage tank is A, the free capacity of the inner cavity of the battery pack is B, the capacity of the antifreeze liquid required in the thermal management water circuit is C, and A≥B+C.

[0019] One purpose of the utility model is to provide an energy storage thermal management system and an energy storage device, including the energy storage thermal management system described in any of the above schemes, which can realize rapid fire fighting and extinguishing of the energy storage device, improve safety, reduce the cost and space occupation of the fire fighting and extinguishing structure installation, and at the same time can automatically replenish the thermal management circulation system, thereby extending the maintenance period of the energy storage thermal management system.

[0020] Beneficial effects of the utility model:

[0021] The utility model provides an energy storage thermal management system and an energy storage device. By setting a water storage tank and a fire water circuit, when the battery pack in the energy storage device is operating normally, the control valve controls each connecting port to close so that the fire water circuit is closed, and antifreeze circulates in the thermal management water circuit to achieve heat exchange for the batteries in each battery pack; when at least one battery pack in the energy storage device has thermal runaway and causes a fire, the control valve controls the corresponding connecting port to open so that the antifreeze flows to the inner cavity of the battery pack to extinguish the battery that triggers thermal runaway in the battery pack. By directly filling the antifreeze into the battery pack to extinguish the fire, not only can the fire of the thermal runaway battery be extinguished faster, but also the heat spread between the batteries in the battery pack can be avoided, and a larger fire can be avoided, thereby improving safety; it also avoids affecting other battery packs, and reduces the loss of the battery in the energy storage device after thermal runaway. Moreover, the setting of the water storage tank also increases the reserve amount of antifreeze in the thermal management water circuit, realizes automatic refilling of the thermal management water circuit, and thus prolongs the maintenance cycle of the energy storage thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a working principle diagram of the energy storage thermal management system provided by the specific implementation mode of the utility model;

[0023] Figure 2 It is an axonometric diagram of the energy storage thermal management system provided by the specific implementation mode of the utility model.

[0024] In the figure:

[0025] 10. Water storage tank; 101. Liquid outlet pipe; 102. Liquid return pipe; 11. Expansion water tank; 12. Fire water tank;

[0026] 20. Thermal management waterway;

[0027] 30. Fire water circuit; 31. Control valve; 32. Exhaust valve; 33. Temperature detector;

[0028] 40. First three-way pipe; 50. Second three-way pipe; 60. Third three-way pipe; 70. Circulating water pump;

[0029] 100. battery pack; 110. battery heat exchanger; 120. housing. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0033] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0034] This embodiment provides an energy storage thermal management system, which is used for thermal management and fire extinguishing in an energy storage device.

[0035] Please refer to Figure 1 and Figure 2Specifically, the energy storage thermal management system includes a water tank 10, a thermal management water circuit 20 and a fire-fighting water circuit 30; wherein the water tank 10 stores antifreeze; the thermal management water circuit 20 is connected to a battery heat exchanger 110 provided with a plurality of battery packs 100, the inlet of the thermal management water circuit 20 is connected to the liquid outlet of the water tank 10, and the outlet of the battery heat exchanger 110 is connected to the liquid return port of the water tank 10, so that the antifreeze circulates in each battery heat exchanger 110; the inlet of the fire-fighting water circuit 30 is connected to the liquid outlet of the water tank 10; the fire-fighting water circuit 30 is provided with a plurality of connecting ports, which are connected to the inner cavity of the battery pack 100 one by one, and a control valve 31 is provided at the connecting port, and the control valve 31 is configured to control the opening and closing of the connecting port so that the inner cavity of the corresponding battery pack 100 is filled with antifreeze.

[0036] The energy storage thermal management system in this embodiment is provided with a water storage tank 10 and a fire water circuit 30. When the battery pack 100 in the energy storage device operates normally, the control valve 31 controls each connecting port to close so that the fire water circuit 30 is closed, and antifreeze circulates in the thermal management water circuit 20 to achieve heat exchange for the batteries in each battery pack 100. When at least one battery pack 100 in the energy storage device has a thermal runaway and causes a fire, the control valve 31 controls the corresponding connecting port to open so that the antifreeze flows into the inner cavity of the battery pack 100 to extinguish the battery in the battery pack 100 that has triggered the thermal runaway. By directly filling the antifreeze into the battery pack 100 to extinguish the fire, not only can the thermal runaway battery be extinguished more quickly, but also the heat spread between the batteries in the battery pack 100 can be avoided, thereby avoiding a larger fire and improving safety. It also avoids affecting other battery packs 100 and reduces the loss of the battery in the energy storage device after the thermal runaway. Moreover, the provision of the water storage tank 10 also increases the reserve amount of antifreeze liquid in the thermal management water circuit 20, realizes automatic liquid replenishment of the thermal management water circuit 20, and thus extends the maintenance period of the energy storage thermal management system.

[0037] Optionally, the liquid outlet of the water tank 10, the inlet of the fire water circuit 30 and the inlet of the thermal management water circuit 20 are connected by a first three-way pipe 40, so that the inlet of the fire water circuit 30 and the inlet of the thermal management water circuit 20 are both connected to the liquid outlet of the water tank 10.

[0038] Optionally, the capacity of the antifreeze liquid in the water storage tank 10 is A, the free capacity of the inner cavity of the battery pack 100 is B, the capacity of the antifreeze liquid required in the thermal management water circuit 20 is C, and A≥B+C. This configuration allows the capacity of the antifreeze liquid in the water storage tank 10 to not only meet the flow of the thermal management water circuit 20, but also meet the filling of the inner cavity of at least one battery pack 100, so as to achieve the effect of extinguishing the fire by filling the inner cavity of the battery pack 100 with thermal runaway with antifreeze liquid.

[0039] Please continue to refer to Figure 1 and Figure 2 In some embodiments, the water storage tank 10 includes an expansion water tank 11 and a fire water tank 12. The expansion water tank 11 is connected to the fire water tank 12. Both the expansion water tank 11 and the fire water tank 12 store antifreeze. The expansion water tank 11 is used for the circulation of the antifreeze in the thermal management water circuit 20, and the fire water tank 12 is used for the supply of antifreeze in the fire water circuit 30. That is, the fire water tank 12 is added to the original expansion water tank 11, and the capacity of the antifreeze is increased to ensure the filling of the antifreeze in the battery pack 100 in case of thermal runaway.

[0040] Furthermore, the liquid outlet of the water tank 10 is provided with a liquid outlet pipe 101 , and the liquid return port of the water tank 10 is provided with a liquid return pipe 102 , so as to achieve the communication between the water tank 10 and the thermal management waterway 20 and the fire fighting waterway 30 .

[0041] In some embodiments, the thermal management water circuit 20 includes a liquid inlet main circuit, a liquid return main circuit and multiple branch circuits, each of which is connected to a battery heat exchanger 110; the liquid inlet main circuit and the multiple branch circuits, as well as the liquid return main circuit and the multiple branch circuits are connected via a second three-way pipe 50.

[0042] In some embodiments, the fire water channel 30 includes a main channel and multiple branch channels, each branch channel is provided with a connecting port, and the main channel and the multiple branch channels are connected via a third three-way pipe 60 .

[0043] Furthermore, the fire water circuit 30 also includes a plurality of exhaust valves 32, which are arranged one by one on the box 120 of the battery pack 100, and the exhaust valves 32 are used to reduce the pressure in the battery pack 100 so that the antifreeze liquid can enter the inner cavity of the battery pack 100 from the connecting port. That is, after a battery in a battery pack 100 is thermally runaway, the exhaust valve 32 is opened, so that the pressure inside the box 120 of the battery pack 100 is reduced, thereby prompting the antifreeze liquid in the fire water circuit 30 to enter the inner cavity of the battery pack 100, so as to extinguish the fire of the battery pack 100; the exhaust valve 32 can also relieve the pressure of the battery pack 100 in thermal runaway to avoid explosion.

[0044] Optionally, the exhaust valve 32 is a normally closed exhaust valve, which is normally closed and opens when thermal runaway occurs.

[0045] Furthermore, the fire water circuit 30 also includes a plurality of temperature detectors 33, which are arranged one by one in the battery pack 100 to detect the temperature of the battery pack 100. When in use, when a battery in the battery pack 100 undergoes thermal runaway, the corresponding temperature detector 33 detects that the temperature exceeds a calibration value, and the corresponding control valve 31 and exhaust valve 32 can be opened to extinguish the fire of the battery pack 100.

[0046] Furthermore, the control valve 31 is a normally closed solenoid valve. Under normal circumstances, it is in a normally closed state. When the temperature detector 33 detects that the temperature exceeds the calibration value, the control valve 31 can be controlled to open through the circuit to allow the antifreeze liquid to enter the inner cavity of the battery pack 100.

[0047] In some embodiments, the energy storage thermal management system also includes a circulating water pump 70, which is arranged at the liquid outlet of the water storage tank 10. The circulating water pump 70 can drive the flow of antifreeze in the energy storage thermal management system to realize the flow of antifreeze in the thermal management waterway 20 and the fire fighting waterway 30.

[0048] This embodiment also provides an energy storage device, which includes the energy storage thermal management system described in any of the above schemes. By setting up the above energy storage thermal management system, it is possible to achieve rapid fire extinguishing when the battery pack 100 in the energy storage device is in thermal runaway, without affecting other battery packs 100, thereby reducing the damage range of thermal runaway and improving the safety of the energy storage device.

[0049] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Energy storage thermal management system, characterized in that: include: A water storage tank (10), wherein antifreeze liquid is stored in the water storage tank (10); A thermal management water circuit (20), the thermal management water circuit (20) being connected to a battery heat exchanger (110) on which a plurality of battery packs (100) are arranged, the inlet of the thermal management water circuit (20) being connected to a liquid outlet of the water storage tank (10), and the outlet of the battery heat exchanger (110) being connected to a liquid return port of the water storage tank (10), so that antifreeze liquid circulates in each of the battery heat exchangers (110); A fire-fighting water circuit (30), wherein the inlet of the fire-fighting water circuit (30) is connected to the liquid outlet of the water storage tank (10); the fire-fighting water circuit (30) is provided with a plurality of connecting ports, wherein the connecting ports are connected one by one to the inner cavity of the battery pack (100), and a control valve (31) is provided at the connecting port, wherein the control valve (31) is configured to control the opening and closing of the connecting port so that the inner cavity of the corresponding battery pack (100) is filled with antifreeze liquid.

2. The energy storage thermal management system according to claim 1, characterized in that: The fire water circuit (30) further comprises a plurality of exhaust valves (32), wherein the exhaust valves (32) are arranged one by one on the box body (120) of the battery pack (100), and the exhaust valves (32) are used to reduce the pressure in the battery pack (100) so that the antifreeze liquid can enter the inner cavity of the battery pack (100) from the connecting port.

3. The energy storage thermal management system according to claim 2, characterized in that: The exhaust valve (32) is a normally closed exhaust valve.

4. The energy storage thermal management system according to claim 1, characterized in that: The fire water channel (30) further comprises a plurality of temperature detectors (33), wherein the temperature detectors (33) are arranged in a one-to-one correspondence on the battery pack (100) to detect the temperature of the battery pack (100).

5. The energy storage thermal management system according to claim 1, characterized in that: The control valve (31) is a normally closed solenoid valve.

6. The energy storage thermal management system according to claim 1, characterized in that: The liquid outlet of the water storage tank (10), the inlet of the fire-fighting water circuit (30) and the inlet of the thermal management water circuit (20) are connected via a first three-way pipe (40).

7. The energy storage thermal management system according to claim 1, characterized in that: The water storage tank (10) comprises an expansion water tank (11) and a fire water tank (12); the expansion water tank (11) is connected to the fire water tank (12); the expansion water tank (11) and the fire water tank (12) both store the antifreeze liquid; the expansion water tank (11) is used for the circulation of the antifreeze liquid in the thermal management water circuit (20); and the fire water tank (12) is used for the supply of the antifreeze liquid to the fire water circuit (30).

8. The energy storage thermal management system according to claim 1, characterized in that: It also includes a circulating water pump (70), which is arranged at the liquid outlet of the water storage tank (10).

9. The energy storage thermal management system according to any one of claims 1 to 8, characterized in that: The capacity of the antifreeze liquid in the water storage tank (10) is A, the free capacity of the inner cavity of the battery pack (100) is B, the capacity of the antifreeze liquid required in the thermal management water circuit (20) is C, and A≥B+C.

10. An energy storage device, characterized in that It comprises the energy storage thermal management system as claimed in any one of claims 1 to 9.

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