A battery pack built-in dehumidification system and a battery pack

Abstract

This invention proposes a battery pack built-in dehumidification system and a battery pack. The built-in dehumidification system includes a battery pack housing, a refrigeration module, and a drainage module. A vent valve is provided on the housing. The refrigeration module is located inside the battery pack housing and connected to the vent valve via a pipe. External airflow entering through the vent valve is guided to the refrigeration module for condensation and dehumidification before entering the battery pack housing. The drainage module is located on the condensate outlet side of the refrigeration module to collect and discharge the condensate produced by the refrigeration module. This structural design pre-treats external moisture before it enters the battery pack, reducing moisture intrusion at the source and significantly improving the system safety of the battery pack. Simultaneously, the integrated arrangement of each module and intelligent collaborative control with the battery management system comprehensively enhance the initiative, reliability, energy efficiency, and safety of battery pack dehumidification.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack with built-in dehumidification system and battery pack. Background Technology

[0002] The airtightness of the battery pack enclosure in electric vehicles is crucial for ensuring the safe and reliable operation of key components such as the internal battery modules, high-voltage connectors, and battery management system (BMS). However, in real-world environments, moisture can easily penetrate the battery pack through components such as vent valves on the enclosure. This intruded moisture condenses into liquid water upon contact with the cold air inside the enclosure, and its accumulation can lead to serious malfunctions such as short circuits in electrical interfaces, high-voltage leakage, and distorted sampling signals, posing significant safety hazards.

[0003] To address this issue, a common approach is to place desiccant inside the battery pack. While this method is simple, desiccant has inherent drawbacks such as limited absorption capacity, short shelf life, and the need for periodic replacement, resulting in high maintenance costs and insufficient reliability. Furthermore, some solutions employ condensation dehumidification via refrigeration, passively treating humid air with a cooling device inside the battery pack. However, this dehumidification is delayed and ineffective. Additionally, the refrigeration control cannot effectively coordinate with the battery pack's thermal management system, leading to insufficient control precision and excessive energy consumption. Utility Model Content

[0004] This utility model provides a battery pack with a built-in dehumidification system and a battery pack to solve technical problems such as safety hazards caused by poor dehumidification effect of the battery pack, and insufficient control accuracy and energy efficiency of the dehumidification system.

[0005] This utility model provides a battery pack built-in dehumidification system, comprising:

[0006] A battery pack housing, wherein a vent valve is provided on the battery pack housing;

[0007] A cooling module is installed inside the battery pack housing. The output end of the vent valve is connected to the air inlet side of the cooling module through a pipe. The external airflow entering through the vent valve is guided to the cooling module for condensation and dehumidification before entering the battery pack housing.

[0008] A drainage module is installed on the condensate outlet side of the refrigeration module to collect and discharge the condensate generated by the refrigeration module.

[0009] In one embodiment of this utility model, the cooling module is electrically connected to the battery management system;

[0010] The battery management system is configured to adjust the cooling power of the cooling module based on the lowest temperature value collected inside the battery pack, so that the cooling surface temperature of the cooling module is maintained at a level lower than the lowest temperature value inside the battery pack by a preset temperature difference value.

[0011] In one embodiment of the present invention, the refrigeration module includes a condenser, the refrigeration surface of which is inclined or vertically arranged relative to the horizontal plane.

[0012] In one embodiment of the present invention, the drainage module includes a condensate collector and a drainage channel;

[0013] The condensate collector is connected to the condensate outlet side of the refrigeration module to collect the condensate flowing down from the refrigeration module, and the drainage channel is connected to the outlet of the condensate collector.

[0014] In one embodiment of this utility model, the drainage channel includes a condensate collection channel and a one-way valve;

[0015] The outlet of the condensate collector is connected to the inlet of the one-way valve through the condensate collection channel, and the outlet of the one-way valve leads to the outside of the battery pack casing.

[0016] In one embodiment of the present invention, the drainage module further includes a liquid level sensor, which is disposed in the condensate collector and / or the condensate manifold to detect the condensate level. The liquid level sensor and the one-way valve are electrically connected to the battery management system.

[0017] In one embodiment of this utility model, the refrigeration module, the condensate collector, and the condensate collection channel are fixedly installed on the bottom plate of the battery pack housing.

[0018] In one embodiment of the present invention, the battery management system is communicatively connected to the charging interface circuit or the vehicle controller to obtain the charging status signal of the battery pack.

[0019] The battery management system is configured to control the start and stop of the cooling module based on the charging state or state of charge parameters of the battery pack.

[0020] In one embodiment of the present invention, the battery management system includes a fault diagnosis circuit, the input terminal of which is electrically connected to the signal output terminal of the liquid level sensor, and the output terminal of which is connected to an alarm signal generation circuit.

[0021] This utility model also proposes a battery pack, including a built-in dehumidification system as described in any of the above embodiments.

[0022] The beneficial effects of this utility model are as follows: The battery pack with built-in dehumidification system and battery pack, connected by a pipe between the vent valve and the refrigeration module, achieves active interception and source pretreatment of intruding moisture, thus fundamentally dehumidifying; the inclined refrigeration surface design enables efficient collection and directional discharge of condensate; the dynamic regulation of refrigeration power by the BMS and the intelligent start-stop strategy based on battery status achieve the best balance between dehumidification efficiency and system energy consumption; and the integrated liquid level monitoring and fault diagnosis drainage control architecture ensures the reliability of the drainage process and early warning of system faults, comprehensively improving the initiative, reliability, energy efficiency, and safety of battery pack dehumidification. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0024] In the attached diagram:

[0025] Figure 1 This is a schematic diagram of the dehumidification system inside a battery pack according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of a battery pack provided in one embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the built-in dehumidification system of the battery pack provided in one embodiment of the present invention.

[0028] The attached figures are labeled as follows:

[0029] 100. Battery pack housing; 110. Vent valve; 120. Base plate;

[0030] 200. Refrigeration module; 210. Condenser; 211. Refrigeration surface;

[0031] 300. Drainage module; 310. Condensate collector; 320. Drainage channel; 321. Condensate manifold; 322. Check valve;

[0032] 400, Pipeline; 500, Protective Net. Detailed Implementation

[0033] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0034] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0035] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0036] The airtightness of electric vehicle battery packs is crucial; however, moisture in the environment can easily penetrate the pack through components such as vent valves, and condensation can lead to serious malfunctions such as electrical short circuits. Existing moisture-absorbing materials have drawbacks such as limited capacity and the need for periodic replacement, while some condensation dehumidification solutions passively treat the intruded moisture inside the battery pack, resulting in dehumidification lag and ineffective coordination with the battery thermal management system, leading to insufficient control precision and energy efficiency.

[0037] Please see Figures 1 to 3This invention proposes a built-in dehumidification system for a battery pack, comprising a battery pack housing 100, a refrigeration module 200, and a drainage module 300. A vent valve 110 is provided on the battery pack housing 100. The refrigeration module 200 is disposed inside the battery pack housing 100. The output end of the vent valve 110 is connected to the air inlet side of the refrigeration module 200 via a pipe 400. External airflow entering through the vent valve 110 is guided to the refrigeration module 200 for condensation and dehumidification before entering the battery pack housing 100. The drainage module 300 is disposed on the condensate outlet side of the refrigeration module 200 to collect and discharge the condensate generated by the refrigeration module 200. This structural design pre-treats external moisture before it enters the battery pack, reducing moisture intrusion at the source and avoiding safety hazards caused by delayed dehumidification, significantly improving the system safety of the battery pack. Simultaneously, the integrated arrangement of the modules lays the structural foundation for subsequent intelligent collaborative control with the Battery Management System (BMS).

[0038] Please see Figures 1 to 3 In an optional embodiment of this utility model, the refrigeration module 200 includes a condenser 210, whose refrigeration surface 211 is inclined or vertically arranged relative to the horizontal plane. The condenser 210 is, for example, a semiconductor refrigeration unit, on which a condensation surface with a directional flow guiding function is formed. The condensate generated on the refrigeration surface 211 can be rapidly collected by its own weight and flow down the inclined plane by utilizing gravity, avoiding the risk of water droplets stagnating or randomly dripping, significantly improving the collection efficiency and guiding of condensate, ensuring that the condensate is reliably led to the predetermined collection position of the drainage module 300, and creating the necessary conditions for the efficient operation of the drainage module 300.

[0039] Please see Figures 1 to 3 In an optional embodiment of this invention, the cooling surface 211 of the semiconductor cooler may also be provided with a flow guiding structure. For example, several parallel V-shaped flow guiding grooves are machined on the cooling surface 211 and extend along the inclined direction of the cooling surface 211, with the bottom of the grooves extending from the air inlet side of the cooling module 200 to the condensate outlet side. When condensate is generated on the cooling surface 211, the droplets, under the action of gravity, not only flow along the inclined surface, but are also rapidly collected and constrained to flow directionally within the grooves due to the capillary action and the confining and guiding effect of the grooves. This significantly increases the collection efficiency of the condensate and avoids the spread, stagnation, or scattering of droplets on the flat inclined surface. The combination of the surface flow guiding structure and the inclined arrangement further enhances the collection and guiding efficiency of the condensate, ensuring that the condensate can be led to the drainage module 300 more quickly and in a more concentrated manner, thereby comprehensively improving the drainage reliability and working efficiency of the entire dehumidification system.

[0040] Please see Figures 1 to 3In an optional embodiment of this invention, the cooling module 200 is installed near the vent valve 110, and a sealed connection is achieved between the vent valve 110 and the air inlet side of the cooling module 200 via a pipe 400, forming an independent air duct dedicated to moisture treatment. This pipe 400 structure ensures that all external airflow entering through the vent valve 110 must flow through the cooling surface 211 of the cooling module 200. During this process, water vapor in the airflow is fully condensed and precipitated, thus achieving comprehensive pretreatment of intruding moisture. Through this active, pre-intercepting dehumidification method, the risk of moisture entering the battery pack's internal space and contacting sensitive electrical components is fundamentally avoided, effectively improving safety.

[0041] Please see Figures 1 to 3 In an optional embodiment of this utility model, a protective net 500 is also installed on one side of the refrigeration module 200. The protective net 500 is disposed between the refrigeration surface 211 and the internal space of the battery pack. For example, it can be made of a metal mesh or engineering plastic mesh with good corrosion resistance. Its mesh size is precisely designed to ensure that the dry air after dehumidification can fully flow into the battery pack. At the same time, it can effectively block the fine particles, fibers and other impurities that may be generated inside the battery pack from being carried by the airflow and entering the refrigeration surface 211 in the opposite direction. This avoids internal impurities from contaminating or clogging the refrigeration module 200, maintaining its long-term stable condensation efficiency and unobstructed airflow channels, thereby ensuring the continuous and reliable operation of the dehumidification system and reducing the impact of internal pollution on system performance.

[0042] Please see Figures 1 to 3 In an optional embodiment of this utility model, the cooling module 200 is electrically connected to the battery management system (BMS). The BMS is configured to adjust the cooling power of the cooling module 200 based on the lowest temperature value collected within the battery pack, so that the temperature of the cooling surface 211 of the cooling module 200 is maintained at a level lower than the lowest temperature value within the battery pack by a preset temperature difference. Specifically, by dynamically setting the cooling target based on the temperature of the most sensitive part (lowest temperature point) within the battery pack, it is ensured that the temperature of the cooling surface 211 is always lower than the dew point temperature of the airflow within the battery pack to achieve effective condensation. At the same time, it avoids excessive cooling that would cause the temperature of the cooling surface 211 to be too low, thereby preventing unnecessary secondary condensation inside the battery pack or the cooling device itself, achieving the best balance between dehumidification effect, battery thermal safety, and system energy consumption. It is understood that the real-time lowest temperature provided by the BMS is dynamically changing. When this lowest temperature changes, the BMS adjusts the cooling power of the cooler to maintain the preset temperature difference, ensuring the condensation effect of water vapor and effectively saving energy.

[0043] Please see Figures 1 to 3In an optional embodiment of this invention, the battery management system is communicatively connected to the vehicle's high-voltage charging interface circuit or vehicle controller to obtain the charging status signal of the battery pack. The battery management system is configured to control the start and stop of the cooling module 200 based on the charging status or state of charge (SOC) parameter of the battery pack. Specifically, during the charging phase or when the SOC value is higher than a certain set threshold (which can be preset according to battery characteristics and environmental conditions), the system has sufficient energy supply and more stringent requirements for the dryness of the internal environment. At this time, the battery management system starts the cooling module 200 to perform dehumidification. During the discharging or resting phase, the cooling module 200 is controlled to reduce its operating power or stop working to achieve energy-saving operation. Based on the condition-based on-demand start and stop control, the overall energy utilization efficiency of the system is significantly improved, which helps to extend the driving range of electric vehicles.

[0044] Please see Figures 1 to 3 In an optional embodiment of this utility model, the drainage module 300 includes a condensate collector 310, a drainage channel 320, and a liquid level sensor. The condensate collector 310 is connected to the condensate outlet side of the refrigeration module 200 to collect the condensate flowing down from the refrigeration module 200. The drainage channel 320 is connected to the outlet of the condensate collector 310. The liquid level sensor is disposed in the condensate collector 310 and / or the condensate collection channel 321 to detect the condensate level. The arrangement of the condensate collector 310 ensures that all condensate can be effectively captured. Its connection with the drainage channel 320 forms a complete drainage path. Combined with the arrangement of the liquid level sensor, it provides key status information for realizing drainage automation and fault diagnosis, making the entire drainage process monitorable and manageable, and enabling intelligent control.

[0045] Please see Figures 1 to 3 In an optional embodiment of this utility model, the drainage channel 320 includes a condensate collection channel 321 and a one-way valve 322. The outlet of the condensate collector 310 is connected to the inlet of the one-way valve 322 through the condensate collection channel 321, and the outlet of the one-way valve 322 leads to the outside of the battery pack housing 100. The condensate collection channel 321 is responsible for orderly outflowing the collector's effluent. The one-way valve 322 is, for example, a one-way solenoid valve, which is designed to allow condensate to flow out of the battery pack in only one direction, while reliably preventing external liquids, dust, and other contaminants from reversing through the drain outlet and invading the sealed battery pack interior, greatly enhancing the system's sealing safety and environmental adaptability. It is understood that the structure of the drainage channel 320 is not limited, and other optional structures can also be adopted, as long as reliable discharge of condensate and sealing protection can be achieved. For example, a mechanical one-way valve 322 can also be used, which utilizes the fluid's own pressure to achieve opening and closing, without the need for external power control, and has a simple structure and high reliability.

[0046] Please see Figures 1 to 3 In an optional embodiment of this utility model, the condensate drainage channel 321 can be a pipe 400 with a certain inclination angle or an integrated flow channel formed in the battery pack bottom plate 120, utilizing gravity to promote the natural flow of condensate and avoid water accumulation; a portion of the drainage channel can also be configured as a U-shaped or V-shaped bend structure to form a liquid seal, further preventing the intrusion of external gases and pollutants. Furthermore, a heating element can be added to the outer wall of the drainage channel or at the one-way valve 322, electrically connected to the battery management system, and activated by the battery management system in low-temperature environments to prevent condensate from freezing and clogging in the drainage channel 320, ensuring the normal operation of the drainage system in extremely cold environments. Through the structural design of the drainage channel 320, while achieving effective drainage, the sealing integrity of the battery pack housing 100 is reliably maintained, and the adaptability and reliability of the dehumidification system under different environmental conditions are improved.

[0047] Please see Figures 1 to 3 In an optional embodiment of this utility model, the liquid level sensor and the one-way valve 322 are electrically connected to the battery management system. When the water level reaches a certain height, the liquid level sensor will send a signal to automatically open the one-way valve 322 to drain the water until the water level drops to a suitable height. This process is controlled by the BMS. If drainage cannot be completed or the water level sensor malfunctions, the BMS will issue a fault alarm, thereby achieving intelligent control and reliable system management.

[0048] Please see Figures 1 to 3 In an optional embodiment of this utility model, the battery management system integrates a fault diagnosis circuit and an alarm signal generation circuit. The input terminal of the fault diagnosis circuit is electrically connected to the signal output terminal of the liquid level sensor, and the output terminal of the fault diagnosis circuit is connected to the alarm signal generation circuit. The fault diagnosis circuit is used to continuously monitor the logical relationship between the liquid level sensor signal and the control command issued to the one-way valve 322. For example, when the liquid level sensor continuously emits a high water level signal but the system does not trigger the drain valve to open, it can be determined that the drainage system is blocked or faulty. Subsequently, the alarm signal generation circuit is triggered to work, and a clear fault alarm signal is sent to the dashboard in the cockpit via the vehicle CAN bus or a separate hard-wired signal, thereby realizing the system's online self-diagnosis and active safety warning functions.

[0049] Please see Figures 1 to 3In an optional embodiment of this utility model, the refrigeration module 200, the condensate collector 310, and the condensate manifold 321 are fixedly installed on the base plate 120 of the battery pack housing 100. By integrating the main components of the dehumidification system into a compact whole through a modular and integrated installation method, not only is the assembly process simplified and manufacturing costs reduced, but the structural stability and reliability of the entire component under vehicle driving vibration environments are also enhanced, avoiding leakage or functional failure that may result from loose components.

[0050] Please see Figures 1 to 3 In one optional embodiment of this utility model, external air is introduced into the cooling module 200 for condensation and dehumidification via the vent valve 110 and the dedicated pipe 400. The dry air enters the battery pack, and the condensate generated is collected and discharged through the anti-backflow drainage channel 320. Throughout the process, the BMS intelligently controls the system, dynamically adjusting the cooling power and system start / stop based on information such as the battery's minimum temperature and charge / discharge status, while simultaneously monitoring the drainage status and triggering fault alarms. The entire system efficiently solves the dehumidification problem of the battery pack through the collaboration of its various sub-modules.

[0051] This utility model also proposes a battery pack, including a built-in dehumidification system as described in any of the above embodiments. This dehumidification system is integrated within the battery pack housing 100, forming an organic whole with the battery pack body. This allows the battery pack to resist moisture intrusion from the source, ensuring the long-term dryness and safe operation of key components such as internal battery modules and high-voltage connectors. Furthermore, due to the deep collaboration between the dehumidification system and the BMS, the energy management of the entire pack is greatly optimized, demonstrating higher reliability, safety, and intelligence.

[0052] In summary, the battery pack of this utility model integrates a dehumidification system and a battery pack. Through the refrigeration module 200 and dedicated pipe 400 located at the front end of the airflow inlet, it achieves active interception and pretreatment of intruding moisture, fundamentally eliminating the safety hazards caused by dehumidification lag. Through electrical connection and coordinated control with the BMS, it achieves precise temperature control and intelligent start-stop based on the actual thermal state of the battery and vehicle operating conditions, significantly improving control accuracy and system energy efficiency. Through the design of the intelligent drainage module 300 with fault diagnosis function, it achieves automatic monitoring and safety warning of the drainage process, greatly improving the reliability and safety of the system.

[0053] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0054] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0055] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention described and illustrated herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0056] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0057] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0058] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0059] The above description of the embodiments shown in this utility model (including the content set forth in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments described herein, and such modifications will be within the spirit and scope of the utility model.

[0060] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0061] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A battery pack built-in dehumidification system, characterized in that, include: A battery pack housing, wherein a vent valve is provided on the battery pack housing; A cooling module is installed inside the battery pack housing. The output end of the vent valve is connected to the air inlet side of the cooling module through a pipe. The external airflow entering through the vent valve is guided to the cooling module for condensation and dehumidification before entering the battery pack housing. A drainage module is installed on the condensate outlet side of the refrigeration module to collect and discharge the condensate generated by the refrigeration module.

2. The battery pack built-in dehumidification system according to claim 1, characterized in that, The cooling module is electrically connected to the battery management system; The battery management system is configured to adjust the cooling power of the cooling module based on the lowest temperature value collected inside the battery pack, so that the cooling surface temperature of the cooling module is maintained at a level lower than the lowest temperature value inside the battery pack by a preset temperature difference value.

3. The battery pack built-in dehumidification system according to claim 2, characterized in that, The refrigeration module includes a condenser, the refrigeration surface of which is inclined or vertical relative to the horizontal plane.

4. The battery pack built-in dehumidification system according to claim 3, characterized in that, The drainage module includes a condensate collector and a drainage channel; The condensate collector is connected to the condensate outlet side of the refrigeration module to collect the condensate flowing down from the refrigeration module, and the drainage channel is connected to the outlet of the condensate collector.

5. The battery pack built-in dehumidification system according to claim 4, characterized in that, The drainage channel includes a condensate collection channel and a one-way valve; The outlet of the condensate collector is connected to the inlet of the one-way valve through the condensate collection channel, and the outlet of the one-way valve leads to the outside of the battery pack casing.

6. The battery pack built-in dehumidification system according to claim 5, characterized in that, The drainage module also includes a liquid level sensor, which is disposed in the condensate collector and / or the condensate manifold to detect the condensate level. The liquid level sensor and the one-way valve are electrically connected to the battery management system.

7. The battery pack built-in dehumidification system according to claim 6, characterized in that, The refrigeration module, the condensate collector, and the condensate collection channel are fixedly installed on the bottom plate of the battery pack housing.

8. The battery pack built-in dehumidification system according to claim 7, characterized in that, The battery management system is communicatively connected to the charging interface circuit or the vehicle controller to obtain the charging status signal of the battery pack. The battery management system is configured to control the start and stop of the cooling module based on the charging state or state of charge parameters of the battery pack.

9. The battery pack built-in dehumidification system according to claim 7, characterized in that, The battery management system includes a fault diagnosis circuit. The input terminal of the fault diagnosis circuit is electrically connected to the signal output terminal of the liquid level sensor, and the output terminal of the fault diagnosis circuit is connected to an alarm signal generation circuit.

10. A battery pack, characterized in that, Includes a battery pack built-in dehumidification system as described in any one of claims 1 to 9.

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