Direct expansion circulating cooling system for energy storage battery

Abstract

The utility model relates to the field of new energy battery packs, in particular to a direct-expansion circulating cooling system for energy storage batteries, which is characterized in that a cooling coil in a battery pack performs contact heat exchange and cooling on a battery pack, an immersion pipe is arranged on the cooling coil, a foaming agent storage bin for injecting a foaming agent is further arranged in the battery pack, and after the temperature of the battery pack exceeds a set temperature, the immersion pipe is inserted into the foaming agent storage bin. And the immersion pipe and the foaming agent storage bin are synchronously opened, so that the refrigerant in the cooling coil is mixed with the foaming agent to immerse the battery pack. Two cooling modes exist, the battery pack can be rapidly cooled when the temperature of the battery pack rapidly rises, and the battery pack is prevented from being on fire.

Description

Technical Field

[0001] The utility model relates to the field of new energy battery packs, in particular to a direct expansion circulation cooling system for an energy storage battery. Background Art

[0002] Energy storage batteries, also known as battery packs, are assembled into modules from cells. Cells are the smallest unit of energy storage batteries and also electrical energy storage units. They must have a high energy density to store as much electrical energy as possible, so that electric vehicles have a longer range. When multiple cells are packaged together in the same outer shell frame and connected to the outside through a unified boundary, this forms a module. When several modules are controlled or managed by the BMS and thermal management system, this unified whole forms a traditional battery pack. Since the operating temperature affects the internal resistance, heat consumption rate, discharge capacity, cycle life and state consistency of the battery, when the operating temperature of the battery pack is too high or too low, the cycle life of the battery pack will drop rapidly, so the operating temperature of the battery pack needs to be controlled within a reasonable range.

[0003] When the battery pack is charged or discharged for a long time, its internal temperature will rise sharply. At this time, the battery pack needs to be properly cooled. The traditional battery pack cooling system is described in patent number "CN220753562U". The coolant enters the serpentine first coolant path and the second coolant path from the liquid inlet pipe. The serpentine coolant path fully increases the heat dissipation area. Since the flow directions of the coolant in the first coolant path and the second coolant path are opposite, the problem of temperature difference in the battery pack caused by the unidirectional flow of coolant can be avoided, thereby ensuring the uniformity of heat exchange of the battery pack. This method of cooling by contact heat exchange of cooling tubes can have a good cooling effect on the battery pack under daily working conditions, but in some extreme conditions (such as the battery pack is punctured or squeezed and deformed), the battery pack temperature will rise rapidly and generate a lot of heat. At this time, the traditional cooling tube contact heat exchange cooling cannot quickly cool the battery pack, which is very likely to cause fire, so it needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a direct expansion cycle cooling system for energy storage batteries. The utility model has two cooling modes, which can quickly cool down the battery pack when the temperature of the battery pack rises rapidly to prevent the battery pack from catching fire.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A direct expansion cycle cooling system for energy storage batteries, wherein a cooling coil in a battery pack cools the battery group by contact heat exchange, an immersion tube is provided on the cooling coil, and a foaming agent storage bin for injecting a foaming agent is also arranged in the battery pack; after the battery pack exceeds a set temperature, the immersion tube and the foaming agent storage bin are opened synchronously so that the refrigerant and the foaming agent in the cooling coil are mixed and then immersed in the battery group; the foaming agent storage bin is arranged in a ring shape and is arranged in contact with the top of the inner wall of the battery pack, and a vertical injection port and a horizontal injection port are arranged on the foaming agent storage bin, the injection direction of the vertical injection port is vertically downward, and the injection direction of the horizontal injection port is arranged perpendicular to the side wall of the battery pack.

[0007] As a further solution of the utility model: the top of the battery pack and the horizontal injection port are located at the same height.

[0008] As a further solution of the utility model: the refrigerant discharged from the cooling coil is collected by the refrigerant collector, and then enters the refrigerant distributor after being cooled and reduced in pressure by the condensing fan and the capillary supercooling tube, and is distributed to the cooling coil to form a circulating flow. A gas-liquid two-phase pump for conveying the refrigerant is installed at the inlet end of the refrigerant collector.

[0009] As a further solution of the utility model: a liquid storage device for storing refrigerant is installed at the outlet of the capillary supercooling tube, and a gas storage regulating tank arranged in parallel with the condensing fan is also installed between the inlet of the gas-liquid two-phase pump and the outlet of the refrigerant collector.

[0010] As a further solution of the utility model: the battery pack and the cooling coil are arranged in layers up and down, and the immersion pipe is opened and closed by a solenoid valve.

[0011] As a further solution of the present invention: the shell of the battery pack is a metal shell.

[0012] As a further solution of the present invention: the battery groups in the battery pack are arranged in a uniform array.

[0013] As a further solution of the present invention: the cooling coils are arranged in an S shape in the battery pack.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model has two cooling modes. When the battery pack is working normally, refrigerant is introduced into the cooling coil. During the flow of the refrigerant, the cooling coil and the battery pack are in contact with each other for heat exchange, so that the temperature of the battery pack decreases. When the temperature of the battery pack increases abnormally and rapidly, the refrigerant in the cooling coil is directly injected into the battery pack through the immersion tube, so that the battery pack is immersed in the refrigerant. At the same time, the foaming agent storage bin in the battery pack injects the foaming agent into the battery pack. The foaming agent and the refrigerant are mixed to form a foaming fire extinguishing agent, which expands rapidly and immerses the battery pack.

[0016] 2. The utility model opens injection ports in two directions on the foaming agent storage bin. The foaming agent injected from the horizontal injection port can pre-cool the battery pack, and the foaming agent injected from the vertical injection port is mixed with the refrigerant to form a foaming fire extinguishing agent. The two-way injection improves the cooling efficiency of the battery pack.

[0017] 3. In the utility model, the gaseous refrigerant and liquid refrigerant discharged from the cooling coil are collected by the refrigerant collector, and then cooled and depressurized when passing through the condensing fan. After the capillary supercooling tube provides cooling, the refrigerant enters the liquid reservoir for storage; the refrigerant stored in the liquid reservoir is distributed to the cooling coil through the refrigerant distributor. The whole circulation process is provided with conveying power and pressure by a gas-liquid two-phase pump, and the gas storage regulating tank ensures effective condensation and liquefaction of the battery pack under different heat dissipation conditions.

[0018] 4. The immersion tube of the utility model is opened and closed by a solenoid valve. When the temperature is lower than the set temperature, the solenoid valve is closed, and the refrigerant only flows through the cooling coil. When the temperature reaches the set temperature, the solenoid valve is opened, and the refrigerant only sprays into the battery pack through the immersion tube, thereby realizing rapid switching of the refrigerant flow path. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a schematic diagram of the structure of the battery pack in the utility model.

[0021] Figure 3 It is a schematic diagram of the structure of the cooling coil in the utility model.

[0022] In the figure:

[0023] 1. Battery pack; 11. Battery pack; 12. Cooling coil; 13. Immersion tube; 131. Solenoid valve;

[0024] 2. Refrigerant distributor; 3. Refrigerant collector; 4. Gas storage and regulating tank;

[0025] 5. Condensation fan; 6. Capillary subcooling tube; 7. Liquid storage tank; 8. Gas-liquid two-phase pump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figures 1 to 3 In the embodiment of the utility model, a direct expansion cycle cooling system for energy storage batteries is provided.

[0028] The metal shell of the battery pack 1 is equipped with a battery pack 11 and a cooling coil 12 arranged in layers. The cooling coil 12 can be arranged in a single layer or a double layer. When the cooling coil 12 is arranged in a single layer, the cooling coil 12 is arranged at the bottom of the battery pack 1, and the battery pack 11 is arranged on the upper layer of the cooling coil 12. When the cooling coil 12 is arranged in a double layer, the two layers of cooling coils 12 are arranged in the upper layer and the lower layer of the battery pack 11 respectively, clamping and fixing the battery pack 11.

[0029] After the refrigerant is introduced into the cooling coil 12, it exchanges heat with the battery pack 11 for cooling. An immersion pipe 13 is also provided on the cooling coil 12, and the pipe opening of the immersion pipe 13 is located in the battery pack 1. A solenoid valve 131 is installed on the immersion pipe 13 to control the opening and closing of the pipeline.

[0030] A foaming agent storage bin is also arranged on the top of the battery pack 1. The foaming agent storage bin is arranged in a ring shape and is arranged in close contact with the top of the inner wall of the battery pack 1. A vertical injection port and a horizontal injection port are arranged on the foaming agent storage bin. The injection direction of the vertical injection port is vertically downward, and the injection direction of the horizontal injection port is arranged perpendicular to the side wall of the battery pack 1. The top of the battery pack 11 is at the same height as the horizontal injection port.

[0031] When the battery pack 1 exceeds the set temperature, the solenoid valve 131 of the foaming agent storage bin and the immersion pipe 13 are opened synchronously to inject the foaming agent and the refrigerant into the battery pack 1 . The foaming agent and the refrigerant are mixed to form a foaming fire extinguishing agent to immerse each battery group 11 .

[0032] The outlet of the cooling coil 12 is connected to the refrigerant collector 3 , and the inlet of the cooling coil 12 is connected to the refrigerant distributor 2 .

[0033] The refrigerant collector 3, the condensing fan 5, the capillary supercooling tube 6, the liquid reservoir 7, the gas-liquid two-phase pump 8 and the refrigerant distributor 2 are connected in sequence to form a refrigerant circulation loop. When the gaseous refrigerant and the liquid refrigerant pass through the condensing fan 5, the temperature and pressure are reduced, and then the capillary supercooling tube 6 provides cooling, and then enters the liquid reservoir 7 for storage. The refrigerant stored in the liquid reservoir 7 is distributed to the cooling coil 12 through the refrigerant distributor 2.

[0034] The gas-liquid two-phase pump 8 provides power and pressure for the delivery of the refrigerant, and pumps the low-temperature and low-pressure liquid refrigerant into the refrigerant distributor 2. A gas storage regulating tank 4 arranged in parallel with the condensing fan 5 is also installed between the inlet of the gas-liquid two-phase pump 8 and the outlet of the refrigerant collector 3. The system adjusts the condensation pressure through the gas storage regulating tank 4, so that the battery pack 1 can ensure effective condensation and liquefaction under different heat dissipation conditions.

[0035] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0036] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A direct expansion cycle cooling system for energy storage batteries, characterized in that: The cooling coil (12) in the battery pack (1) cools the battery group (11) by contact heat exchange. An immersion pipe (13) is provided on the cooling coil (12). A foaming agent storage bin for injecting a foaming agent is also arranged in the battery pack (1). When the battery pack (1) exceeds a set temperature, the immersion pipe (13) and the foaming agent storage bin are opened synchronously so that the refrigerant and the foaming agent in the cooling coil (12) are mixed and then immersed in the battery group (11); the foaming agent storage bin is arranged in a ring shape and is arranged in close contact with the top of the inner wall of the battery pack (1). A vertical injection port and a horizontal injection port are arranged on the foaming agent storage bin. The injection direction of the vertical injection port is vertically downward, and the injection direction of the horizontal injection port is arranged perpendicular to the side wall of the battery pack (1).

2. The energy storage battery direct expansion cycle cooling system according to claim 1, characterized in that: The top of the battery pack (11) is located at the same height as the horizontal injection port.

3. A direct expansion cycle cooling system for energy storage batteries according to claim 1 or 2, characterized in that: The refrigerant discharged from the cooling coil (12) is collected by the refrigerant collector (3), cooled and depressurized by the condensing fan (5) and the capillary supercooling tube (6) before entering the refrigerant distributor (2) and being distributed to the cooling coil (12) to form a circulating flow. The inlet end of the refrigerant collector (3) is equipped with a gas-liquid two-phase pump (8) for conveying the refrigerant.

4. The energy storage battery direct expansion cycle cooling system according to claim 3 is characterized in that: A liquid storage tank (7) for storing refrigerant is installed at the outlet of the capillary supercooling tube (6), and a gas storage regulating tank (4) arranged in parallel with the condensing fan (5) is also installed between the inlet of the gas-liquid two-phase pump (8) and the outlet of the refrigerant collector (3).

5. A direct expansion cycle cooling system for energy storage batteries according to claim 1 or 2, characterized in that: The battery pack (11) and the cooling coil (12) are arranged in layers up and down, and the immersion pipe (13) is opened and closed by a solenoid valve (131).

6. A direct expansion cycle cooling system for energy storage batteries according to claim 1 or 2, characterized in that: The outer shell of the battery pack (1) is a metal outer shell.

7. A direct expansion cycle cooling system for energy storage batteries according to claim 1 or 2, characterized in that: The battery groups (11) in the battery pack (1) are arranged in a uniform array.

8. A direct expansion cycle cooling system for energy storage batteries according to claim 1 or 2, characterized in that: The cooling coils (12) are arranged in an S shape inside the battery pack (1).

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