A cooling control system for a power battery pack

Abstract

The utility model discloses a cooling control system for power battery pack belongs to power battery pack technical field, including the pipeline connection of silicon oil storage tank, silicon oil pump, battery pack box, hot silicon oil discharge valve, silicon oil recovery tank silicon oil circulation valve and heat exchanger in proper order, and silicon oil is used to the battery pack box in -cooling silicon oil, the silicon oil export of battery pack box is connected with silicon oil recovery tank through hot silicon oil discharge valve, and silicon oil recovery tank is connected with heat exchanger through silicon oil circulation valve, and the export of heat exchanger is connected with silicon oil storage tank, and heat exchanger is used to cool the recovered hot silicon oil, and the cooling silicon oil after cooling returns to silicon oil storage tank and circulates and uses. The utility model discloses utilize silicon oil's excellent thermal stability, higher thermal conductivity and almost insulating characteristics, use it as the cooling medium of power battery pack, and heat exchanger is used to cool the hot silicon oil after heat exchange and circulates and uses after cooling, reduces the use amount of silicon oil, ensures the low temperature, safe operation of power battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of power battery pack technology, specifically a cooling control system for power battery packs. Background Technology

[0002] In recent years, the new energy industry has developed rapidly, with many fields such as electric vehicles and distributed energy storage power stations beginning to develop vigorously. However, as a key component, the performance and safety of the power battery pack directly affect the operational effectiveness of the entire system.

[0003] While traditional air cooling methods once dominated, such as common air-cooled architectures that rely on fans to circulate air over the battery pack surface for heat dissipation, air cooling has inherent limitations. Air's low thermal conductivity is a key factor limiting heat transfer efficiency, especially under heavy load scenarios like rapid acceleration in electric vehicles, prolonged hill climbing, or high-power charging and discharging in energy storage stations. In these situations, a large amount of heat accumulates inside the battery pack in a short time, and the air-cooling system struggles to dissipate this heat quickly and effectively, resulting in a rapid rise in battery temperature. Excessive temperature not only significantly reduces battery charging and discharging performance but also accelerates battery aging over time, potentially triggering thermal runaway and posing a catastrophic safety hazard. Secondly, water cooling technology is gradually developing and gaining wider acceptance. Water cooling systems utilize circulating water as a heat carrier, absorbing the heat generated by the battery pack and then dissipating it to the surrounding environment using an external heatsink. Compared to air cooling, water cooling represents a significant leap in heat exchange efficiency, handling more heat in a shorter time. However, water-cooling technology also faces significant challenges. First, water's inherent conductivity means that when cooling pipes rupture and leak, the coolant can instantly come into direct contact with the battery pack, easily triggering a short circuit. This could cause irreversible damage to the battery pack and even the entire power system. Second, in extremely cold environments, water freezes readily. The formation of ice crystals not only clogs cooling pipes, hindering coolant circulation, but also damages the physical structure of the entire cooling system, rendering it inoperable. Utility Model Content

[0004] The technical problem to be solved by this utility model is to address the numerous problems existing in existing air cooling and water cooling systems. It proposes a cooling control system for power battery packs, which adopts silicone oil cooling technology to effectively control the temperature of the battery pack and ensure that the battery operates within a suitable temperature range, thereby improving the battery's performance and service life.

[0005] To solve the above-mentioned technical problems, this utility model provides a cooling control system for a power battery pack, including a silicone oil storage tank, a silicone oil pump, a battery pack housing, a hot silicone oil discharge valve, a silicone oil recovery tank, a silicone oil circulation valve, and a heat exchanger connected in sequence by pipes. The silicone oil pump is connected to the silicone oil inlet of the battery pack housing for introducing cooling silicone oil into the battery pack housing. The silicone oil outlet of the battery pack housing is connected to the silicone oil recovery tank through the hot silicone oil discharge valve. The silicone oil recovery tank is connected to the heat exchanger through the silicone oil circulation valve. The outlet of the heat exchanger is connected to the silicone oil storage tank. The heat exchanger is used to cool the recovered hot silicone oil. The cooled silicone oil is returned to the silicone oil storage tank for recycling.

[0006] The silicone oil storage tank stores the silicone oil cooling medium, providing the initial storage volume for silicone oil circulation. During the operation of the cooling control system, when the volume of silicone oil changes due to factors such as thermal expansion and contraction, the silicone oil storage tank can promptly balance the total amount of silicone oil in the system, ensuring the continuity and stability of silicone oil circulation. The silicone oil pump, as the power source of the entire cooling control system, drives the entire cooling process. The silicone oil pump is tightly connected to the battery pack enclosure through pipelines, delivering silicone oil to the battery pack enclosure to cool the battery packs inside, while also providing power for silicone oil circulation. The battery pack enclosure provides a relatively closed and stable environment for the power battery pack and silicone oil, ensuring that the silicone oil is evenly distributed around the batteries, providing good cooling to every battery surface, and effectively preventing accidental leakage of silicone oil, thus ensuring the safe operation of the entire cooling control system. The battery pack housing houses the power battery pack, which, as the object to be cooled, is composed of multiple carefully arranged battery cells, resembling a collection of energy. It is placed within the battery pack housing and completely submerged in silicone oil. This allows the silicone oil to have comprehensive and seamless contact with the battery surface, efficiently absorbing the heat generated during charging and discharging. The hot silicone oil drain valve flexibly adjusts the flow and pressure of the silicone oil based on the real-time liquid level and temperature within the battery pack housing, as well as the overall operating status of the cooling control system. This precisely controls the cooling rhythm and intensity, ensuring the battery pack remains within its optimal operating temperature range and achieves its best performance. The silicone oil recovery tank receives hot silicone oil from the battery pack housing due to thermal expansion exceeding a set liquid level or temperature exceeding a set threshold. After heat exchange, the hot silicone oil is recycled back into the cooling system, achieving silicone oil recycling.

[0007] As a further description of the above technical solution, the battery pack housing is equipped with a liquid level sensor and a temperature sensor, both of which are electrically connected to the silicone oil pump and the hot silicone oil discharge valve via a controller. When the volume of the silicone oil in the battery pack housing changes due to thermal expansion and exceeds the set liquid level, or when the temperature exceeds a set threshold, the controller can automatically control the hot silicone oil discharge valve to open, discharging the hot silicone oil in the battery pack housing into the silicone oil recovery tank. Simultaneously, the silicone oil pump is activated to replenish the cooling silicone oil, ensuring that the silicone oil in the battery pack housing remains within the set liquid level and temperature range, thereby achieving continuous and stable cooling of the power battery pack immersed in it.

[0008] As a further description of the above technical solution, a silicone oil filter is provided between the battery pack housing and the hot silicone oil drain valve to filter out any impurities that may be present in the silicone oil, preventing any impurities from entering subsequent pipes and components, thereby avoiding damage to the cooling control system due to impurity blockage.

[0009] As a further description of the above technical solution, a liquid level sensor is installed in the silicone oil recovery tank. The liquid level sensor is electrically connected to the silicone oil circulation valve through a controller. When the hot silicone oil collected in the silicone oil recovery tank reaches a certain liquid level, the controller controls the silicone oil circulation valve to open, so that the hot silicone oil is cooled by heat exchanger and sent into the silicone oil storage tank for recycling.

[0010] As a further description of the above technical solution, the pipeline is a fluoroplastic pipeline or a stainless steel pipeline. Considering the chemical stability of silicone oil, the pipeline material must be compatible with it to avoid chemical reactions. At the same time, it must also have good temperature resistance to adapt to high-temperature working conditions. Fluoroplastic pipelines and stainless steel pipelines not only have good compatibility with silicone oil, but can also withstand certain pressure and temperature changes.

[0011] As a further description of the above technical solution, the heat exchanger is a finned heat exchanger. Given the high specific heat capacity of silicone oil, the area and structure of the heat exchanger need to be optimized. A finned heat exchanger is adopted, and the density and height of the fins are increased to increase the contact area with air and improve heat dissipation efficiency. In addition, a refrigerant can be used to exchange heat with the silicone oil, rapidly reducing the temperature of the silicone oil and facilitating its recirculation.

[0012] This invention's cooling control system utilizes silicone oil cooling technology to effectively control the battery pack's temperature, ensuring the battery operates within a suitable temperature range, thereby improving battery performance and lifespan. Firstly, silicone oil possesses excellent thermal stability, maintaining a liquid state over a wide temperature range. This characteristic ensures that regardless of fluctuations in ambient temperature or changes in the battery pack's operating state, the cooling control system provides stable and reliable cooling performance. Compared to air, silicone oil has a higher thermal conductivity, meaning it can remove heat from the battery pack more quickly and efficiently during heat transfer. Furthermore, silicone oil is chemically extremely stable and will not react chemically with various battery pack materials even after prolonged contact, fundamentally ensuring the integrity of the battery pack structure and avoiding potential failures caused by coolant corrosion. Particularly noteworthy is the near-insulating nature of silicone oil, which significantly reduces the risk of short circuits caused by coolant leakage. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the cooling control system for a power battery pack according to this utility model.

[0014] Legend:

[0015] 1-Silicone oil storage tank; 2-Silicone oil pump; 3-Battery pack housing; 4-Silicone oil filter; 5-Hot silicone oil discharge valve; 6-Silicone oil recovery tank; 7-Silicone oil circulation valve; 8-Heat exchanger; 9-Power battery pack. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] A cooling control system for power battery packs, such as Figure 1As shown, the system includes a silicone oil storage tank 1, a silicone oil pump 2, a battery pack housing 3, a silicone oil filter 4, a hot silicone oil discharge valve 5, a silicone oil recovery tank 6, a silicone oil circulation valve 7, and a heat exchanger 8, all connected in sequence by pipes. The silicone oil storage tank 1 stores silicone oil, providing an initial amount for the cooling control system. The amount of silicone oil stored in the storage tank 1 must be greater than the maximum amount of silicone oil used in the battery pack housing 3 to maintain the temperature of the entire cooling control system and ensure continuous operation. The pipes are made of stainless steel, which is compatible with silicone oil and can withstand certain pressure and temperature changes. The silicone oil pump 2 and the battery pack housing 3... The silicone oil inlet connection is used to introduce cooling silicone oil into the battery pack housing 3, driving the entire cooling process. The battery pack housing 3 provides a relatively closed and stable environment for the power battery pack 9 and the silicone oil. This not only ensures that the silicone oil is evenly distributed around the power battery pack 9, allowing each battery surface to receive good cooling, but also effectively prevents accidental leakage of silicone oil, ensuring the safe operation of the entire cooling control system. The power battery pack 9 is housed inside the battery pack housing 3. As the object to be cooled, the power battery pack 9 is composed of multiple carefully arranged battery cells, resembling a... The energy reservoir is housed within the battery pack housing 3 and completely submerged in silicone oil. This allows the silicone oil to maintain close contact with the battery surface from all angles, efficiently absorbing the heat generated during charging and discharging. The silicone oil outlet of the battery pack housing 3 is connected to the silicone oil recovery tank 6 via a hot silicone oil discharge valve 5. The battery pack housing 3 also contains a level sensor and a temperature sensor, both electrically connected to the silicone oil pump 2 and the hot silicone oil discharge valve 5 via a controller. When the volume of silicone oil in the battery pack housing 3 changes due to temperature rise and exceeds the set level, or when the temperature... When the set threshold is exceeded, the controller can automatically open the hot silicone oil discharge valve 5 to discharge the hot silicone oil in the battery pack housing 3 into the silicone oil recovery tank 6. At the same time, the silicone oil pump 2 is turned on to replenish the cooling silicone oil, so that the silicone oil in the battery pack housing 3 is always within the set liquid level and temperature range, thereby achieving continuous and stable cooling of the power battery pack 9 immersed in it. A silicone oil filter 4 is provided between the battery pack housing 3 and the hot silicone oil discharge valve 5 to filter out any impurities that may be present in the silicone oil, preventing impurities from entering subsequent pipes and components, thereby avoiding damage to the cooling control system due to impurities clogging. The silicone oil recovery tank 6 is connected to the heat exchanger 8 via the silicone oil circulation valve 7. The outlet of the heat exchanger 8 is connected to the silicone oil storage tank 1. The silicone oil recovery tank 6 is equipped with a liquid level sensor, which is electrically connected to the silicone oil circulation valve 7 via a controller. When the hot silicone oil collected in the silicone oil recovery tank 6 reaches a certain liquid level, the controller controls the silicone oil circulation valve 7 to open, so that the hot silicone oil is cooled by heat exchanger 8 and then sent to the silicone oil storage tank 1 for circulation. The heat exchanger 8 is a finned heat exchanger, and a refrigerant is used to quickly cool the silicone oil.

[0018] The cooling control system of this invention uses silicone oil cooling technology to cool the power battery pack 9, effectively controlling the temperature of the battery pack and ensuring that the battery operates within a suitable temperature range, thereby improving battery performance and lifespan. The hot silicone oil that exchanges heat with the battery is filtered, cooled, and then recycled, which reduces the amount of silicone oil carried over and used.

[0019] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it; those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of this utility model.

Claims

1. A cooling control system for a power battery pack, characterized in that, The system includes a silicone oil storage tank (1), a silicone oil pump (2), a battery pack housing (3), a hot silicone oil discharge valve (5), a silicone oil recovery tank (6), a silicone oil circulation valve (7), and a heat exchanger (8) connected in sequence by pipes. The silicone oil pump (2) is connected to the silicone oil inlet of the battery pack housing (3) and is used to introduce cooling silicone oil into the battery pack housing (3). The silicone oil outlet of the battery pack housing (3) is connected to the silicone oil recovery tank (6) through the hot silicone oil discharge valve (5). The silicone oil recovery tank (6) is connected to the heat exchanger (8) through the silicone oil circulation valve (7). The outlet of the heat exchanger (8) is connected to the silicone oil storage tank (1). The heat exchanger (8) is used to cool the recovered hot silicone oil. The cooled silicone oil is returned to the silicone oil storage tank (1) for recycling.

2. The cooling control system for a power battery pack as described in claim 1, characterized in that: The battery pack housing (3) is equipped with a liquid level sensor and a temperature sensor. Both the liquid level sensor and the temperature sensor are electrically connected to the silicone oil pump (2) and the hot silicone oil discharge valve (5) through the controller.

3. The cooling control system for a power battery pack as described in claim 2, characterized in that: A silicone oil filter (4) is provided between the battery pack housing (3) and the hot silicone oil drain valve (5).

4. The cooling control system for a power battery pack as described in claim 1, characterized in that: The silicone oil recovery tank (6) is equipped with a liquid level sensor, which is electrically connected to the silicone oil circulation valve (7) through a controller.

5. The cooling control system for a power battery pack as described in claim 1, characterized in that: The pipes are either fluoroplastic pipes or stainless steel pipes.

6. The cooling control system for a power battery pack as described in claim 1, characterized in that: The heat exchanger (8) is a finned heat exchanger.

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