Temperature control and fire-fighting integrated structure of submerged liquid-cooled battery system

Abstract

This utility model discloses an integrated temperature control and fire suppression structure for an immersion liquid-cooled battery system, including a liquid-cooled battery pack body. A coolant circulation pipe is installed on one side of the liquid-cooled battery pack body, and a storage tank is installed inside the coolant circulation pipe. A fuse valve is installed at the outlet of the storage tank. Multiple temperature sensors are installed on the surface of the battery cells inside the liquid-cooled battery pack body and at the coolant outlet. The fuse valve is electrically connected to the temperature sensors. The integrated coolant circulation pipe and perfluorohexanone storage tank form a composite flow channel, shortening the fire extinguishing agent transmission path to 0.3m. The measured response time is ≤3.5 seconds. CFD simulation verification shows that the time for the fire extinguishing agent concentration to reach the fire extinguishing threshold is shortened to 8 seconds.

Description

Technical Field

[0001] This utility model relates to the field of immersion liquid-cooled battery technology, specifically to an integrated temperature control and fire protection structure for an immersion liquid-cooled battery system. Background Technology

[0002] Battery energy storage systems have multiple centralized battery packs composed of series and parallel circuits. Most battery packs include a housing and battery modules located inside the housing. When high-energy-density cells experience thermal failure, they release high-temperature heat flow. When this high-temperature heat flow leaks and comes into contact with air, it is easy to ignite, which can lead to fire and cause significant economic losses.

[0003] Existing immersion liquid-cooled battery fire suppression systems are physically isolated from the cooling circuit, and the extinguishing agent needs to be delivered through an independent pipeline, resulting in a fire response delay of more than 30 seconds, making it difficult to suppress thermal runaway chain reactions.

[0004] To address this, an integrated temperature control and fire suppression structure for an immersion liquid-cooled battery system is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated temperature control and fire protection structure for an immersion liquid-cooled battery system, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated temperature control and fire protection structure for an immersion liquid-cooled battery system, comprising a liquid-cooled battery pack body, a coolant circulation pipe installed on one side of the liquid-cooled battery pack body, a storage tank installed inside the coolant circulation pipe, and a fuse valve installed at the outlet of the storage tank;

[0007] Multiple temperature sensors are installed on the surface of the battery cells and at the coolant outlet inside the liquid-cooled battery pack body, and the fuse valve is electrically connected to the temperature sensors.

[0008] Preferably, a fixing cylinder is provided on the outer side of the tail end of the storage tank, and multiple second support ribs are evenly installed between the inner wall of the fixing cylinder and the outer side of the storage tank.

[0009] Preferably, the outer side of the fixed cylinder is provided with external threads.

[0010] Preferably, one end of the coolant circulation pipe is provided with an internal thread, and the internal thread is threadedly connected to the external thread.

[0011] Preferably, a limiting cylinder is provided on the outer front end of the storage tank, and a plurality of first supporting ribs are evenly installed between the inner wall of the limiting cylinder and the outer side of the storage tank.

[0012] Preferably, the storage tank has a wall thickness of 2.5mm and is formed by laser welding of SUS316L stainless steel. The interior of the storage tank uses perfluorohexanone fire extinguishing agent.

[0013] Preferably, the fusible valve uses a shape memory alloy actuator with a phase transition temperature of 78–82°C.

[0014] Compared with the prior art, the beneficial effects of this utility model are: the composite flow channel body integrating the coolant circulation pipeline and the perfluorohexanone storage tank shortens the fire extinguishing agent transmission path to 0.3m, the measured response time is ≤3.5 seconds, and through CFD simulation verification, the time for the fire extinguishing agent concentration to reach the fire extinguishing threshold is shortened to 8 seconds. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is an exploded view of the structure of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the storage tank of this utility model;

[0018] Figure 4 This is a cross-sectional structural diagram of the present invention.

[0019] In the diagram: 1. Liquid-cooled battery pack body; 2. Coolant circulation pipe; 3. Internal thread; 4. Fixing cylinder; 5. External thread; 6. Storage tank; 7. Limiting cylinder; 8. Fusible valve; 9. First support rib; 10. Second support rib. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] Please see Figure 1-4 This utility model provides a technical solution: an integrated temperature control and fire protection structure for an immersion liquid-cooled battery system, including a liquid-cooled battery pack body 1, a coolant circulation pipe 2 installed on one side of the liquid-cooled battery pack body 1, the coolant circulation pipe 2 having a diameter Φ = 25mm and a wall thickness of 2mm, a storage tank 6 installed inside the coolant circulation pipe 2, the storage tank 6 having a volume V = 350mL and a pressure bearing capacity ≥ 1.2MPa, the storage tank 6 being coaxially arranged with the coolant circulation pipe 2, and a fuse valve 8 installed at the outlet of the storage tank 6;

[0022] During pipe installation, silicone sealant (Dow Corning DC-3-1953) is filled using the vacuum injection method, with a curing temperature of 120℃ / 2h. The interference fit of the sealing ring is designed to be 0.3~0.5mm, and the preload is controlled at 18~22N·m.

[0023] Multiple temperature sensors are installed on the surface of the battery cells and at the coolant outlet inside the liquid-cooled battery pack body 1, and the fuse valve 8 is electrically connected to the temperature sensors.

[0024] like Figure 2 and Figure 3 As shown: A fixing cylinder 4 is provided on the outer side of the tail end of the storage tank 6. Multiple second support ribs 10 are evenly installed between the inner wall of the fixing cylinder 4 and the outer side of the storage tank 6. Through the above arrangement, the fixing cylinder 4 can restrict the tail end of the storage tank 6, avoiding the situation where the tail end of the storage tank 6 moves arbitrarily and tilts, and making it easier for the storage tank 6 to be coaxially set with the coolant circulation pipe 2.

[0025] like Figure 2 , Figure 3 and Figure 4 As shown: the outer side of the fixed cylinder 4 is provided with an external thread 5, and one end of the coolant circulation pipe 2 is provided with an internal thread 3. The internal thread 3 and the external thread 5 are threadedly connected. With the above settings, the fixed cylinder 4 can be connected to the coolant circulation pipe 2 through the internal thread 3 and the external thread 5, which avoids the storage tank 6 from being moved at will.

[0026] like Figure 3 and Figure 4 As shown: A limiting cylinder 7 is provided on the outer side of the front end of the storage tank 6. Multiple first support ribs 9 are evenly installed between the inner wall of the limiting cylinder 7 and the outer side of the storage tank 6. Through the above settings, the position of the front end of the storage tank 6 can be restricted, thus preventing the front end of the storage tank 6 from shaking randomly.

[0027] like Figure 4 As shown: the wall thickness of storage tank 6 is 2.5mm, and it is formed by laser welding of SUS316L stainless steel. The interior of storage tank 6 uses perfluorohexanone fire extinguishing agent. With the above settings, the volume ratio of storage tank 6 is 15-20%. Perfluorohexanone is injected into the coolant at a pressure of 0.8MPa to form a gas-liquid two-phase fire extinguishing medium.

[0028] like Figure 4 As shown: The fusible valve 8 uses a shape memory alloy actuator with a phase transition temperature of 78-82℃; with the above settings, when the fusible valve 8 is energized and triggered, the shape memory alloy (Ni-Ti-Cu) actuator produces a stroke displacement of 4.2mm.

[0029] Working principle: During normal operation, the coolant (ethylene glycol aqueous solution) circulates and exchanges heat in the coolant circulation pipe 2. When any temperature sensor detects T≥80℃ and continues for Δt≥500ms, the fuse valve 8 is energized and triggered, the shape memory alloy actuator generates a stroke displacement of 4.2mm, and perfluorohexanone is injected into the coolant at a pressure of 0.8MPa, forming a gas-liquid two-phase fire extinguishing medium.

[0030] Response time optimization: The extinguishing agent transmission path is shortened to 0.3m, and the measured response time is ≤3.5 seconds (an improvement of 87% compared to existing technologies). Through CFD simulation verification, the time for the extinguishing agent concentration to reach the extinguishing threshold is shortened to 8 seconds.

[0031] Improved sealing performance: The double-layer seal + silicone sealant filling structure results in a leakage rate of ≤0.05% (2000 thermal cycle tests), which is certified by ISO 15848-1 standard and achieves a BH-level sealing rating.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated temperature control and fire suppression structure for an immersion liquid-cooled battery system, comprising a liquid-cooled battery pack body (1), characterized in that: A coolant circulation pipe (2) is installed on one side of the liquid-cooled battery pack body (1), a storage tank (6) is installed inside the coolant circulation pipe (2), and a fuse valve (8) is installed at the outlet of the storage tank (6). Multiple temperature sensors are installed on the surface of the battery cells and at the outlet of the coolant inside the liquid-cooled battery pack body (1), and the fuse valve (8) is electrically connected to the temperature sensors.

2. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 1, characterized in that: The storage tank (6) has a fixing cylinder (4) on the outer side of its tail end. Multiple second support ribs (10) are evenly installed between the inner wall of the fixing cylinder (4) and the outer side of the storage tank (6).

3. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 2, characterized in that: The outer side of the fixed cylinder (4) is provided with external threads (5).

4. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 3, characterized in that: The coolant circulation pipe (2) has an internal thread (3) at one end, and the internal thread (3) is threadedly connected to the external thread (5).

5. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 1, characterized in that: The front side of the storage tank (6) is provided with a limiting cylinder (7), and a plurality of first support ribs (9) are evenly installed between the inner wall of the limiting cylinder (7) and the outer side of the storage tank (6).

6. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 1, characterized in that: The storage tank (6) has a wall thickness of 2.5 mm and is formed by laser welding of SUS316L stainless steel. The interior of the storage tank (6) is filled with perfluorohexanone fire extinguishing agent.

7. The integrated temperature control and fire suppression structure of the immersion liquid-cooled battery system according to claim 1, characterized in that: The fusible valve (8) uses a shape memory alloy actuator with a phase transition temperature of 78-82℃.

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