Battery pack

Abstract

The utility model relates to the technical field of battery waterproofing, and provides a battery pack which comprises a box body, an exhaust balance valve, a control unit and an inflating device, the box body is provided with a containing cavity used for containing a battery cell stacking body, an exhaust hole communicated with the containing cavity and the outside atmosphere is formed in the box body, the exhaust balance valve is arranged at the exhaust hole and is in communication connection with the control unit, and the inflation device is used for inflating the containing cavity and is in communication connection with the control unit. The control unit is configured to be capable of closing the exhaust balance valve and starting the inflation device to maintain the positive pressure in the containing cavity. Positive pressure in the containing cavity is maintained through the inflation device, and therefore external moisture is prevented from entering the containing cavity. Even if a slight leakage point exists in the battery pack, the positive pressure in the accommodating cavity can effectively discharge the water or prevent the water from entering. And the exhaust balance valve and the inflation device are matched, so that the battery pack can actively keep internal pressure in the normal use process, and the active waterproof effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of battery waterproofing technology, and in particular to a battery pack. Background Technology

[0002] With the rapid development of new energy vehicles and energy storage equipment, the safe operation of power battery packs, as the core energy carrier, has become a focus of industry attention. In the safety protection system of new energy vehicle power battery systems, seal integrity management, pressure balance control, and environmental humidity regulation constitute the core protection mechanisms.

[0003] The battery pack is equipped with an exhaust balance valve. When passing through waterlogged roads or when the outside humidity is high, water or humid air may enter the battery pack, which may cause a short circuit in the battery cells inside the battery pack. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to propose a battery pack to improve the waterproof capability of the battery pack.

[0005] To achieve the above and other related objectives, this utility model provides a battery pack, comprising:

[0006] The housing has a cavity for accommodating the battery cell stack, and the housing has an exhaust port that connects the cavity to the outside atmosphere;

[0007] An exhaust balance valve and a control unit, wherein the exhaust balance valve is disposed at the exhaust port and is communicatively connected to the control unit;

[0008] An inflation device for inflating the receiving cavity, the inflation device being communicatively connected to the control unit;

[0009] The control unit is configured to close the exhaust balance valve and activate the inflation device to maintain positive pressure within the containment cavity.

[0010] In an optional embodiment of this utility model, a liquid level sensor for detecting the water level outside the battery pack is further included. The control unit is communicatively connected to the liquid level sensor. The control unit is configured to close the exhaust balance valve and start the inflation device to maintain positive pressure in the containment cavity based on the water level detected by the liquid level sensor.

[0011] In an optional embodiment of this utility model, a pressure sensor is provided inside the receiving cavity. The pressure sensor can detect the pressure inside the receiving cavity and is communicatively connected to the control unit.

[0012] In an optional embodiment of this utility model, the control unit is configured to: close the exhaust balance valve, start the inflation device until the air pressure in the containment cavity reaches the target threshold, and measure the rate of decrease of the air pressure in the containment cavity through the air pressure sensor to determine whether the airtightness of the battery pack is intact.

[0013] In an optional embodiment of this utility model, a humidity sensor is provided inside the receiving cavity. The humidity sensor is capable of detecting the humidity inside the receiving cavity and is communicatively connected to the control unit.

[0014] In an optional embodiment of the present invention, the inflation device includes a dry hot air source, and the control unit is configured to: open the exhaust balance valve according to the humidity information detected by the humidity sensor, and start the inflation device to introduce dry hot air into the receiving cavity through the dry hot air source.

[0015] In an optional embodiment of this utility model, multiple humidity sensors are provided in different areas of the receiving cavity, and multiple exhaust balance valves are provided corresponding to different areas of the receiving cavity.

[0016] In an optional embodiment of this utility model, the exhaust balance valve includes a valve seat and a valve core. The valve seat has a through hole covered with a breathable membrane. The valve core is arranged coaxially with the through hole and is connected to a drive unit. The drive unit is used to drive the valve core to block the through hole or disengage from the through hole.

[0017] In an optional embodiment of this utility model, the valve seat is provided with a mounting hole, the valve core is provided with a valve stem for inserting into the mounting hole, the valve stem is connected to the drive unit, and the drive unit is used to drive the valve stem to slide in the mounting hole so that the valve core blocks the through hole or disengages from the through hole.

[0018] In an optional embodiment of this utility model, a radial sealing ring is provided between the peripheral wall of the valve stem and the inner wall of the mounting hole, an inner sealing ring is provided between the end of the valve stem near the receiving cavity and the end of the mounting hole near the receiving cavity, and an outer sealing ring is provided between the side of the valve core near the receiving cavity and the valve seat.

[0019] In an optional embodiment of the present invention, the inflation device includes an air inlet, which is disposed on the side wall of the box, and the exhaust hole and the air inlet are disposed on different side walls of the box.

[0020] The technical advantage of this invention lies in the fact that it maintains positive pressure within the containment cavity through an inflation device, thereby preventing external moisture from entering. Even if there are minor leaks in the battery pack, the positive pressure within the containment cavity can effectively expel moisture or prevent it from entering. The combination of the exhaust balance valve and the inflation device allows the battery pack to actively maintain internal pressure during normal use, thus achieving an active waterproofing effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery pack structure in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the exhaust balance valve of the battery pack in one embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the exhaust balance valve and drive unit of the battery pack in one embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of the exhaust balance valve of the battery pack in the closed state according to one embodiment of the present invention;

[0026] Figure 5 This is a cross-sectional view of the exhaust balance valve of the battery pack in one embodiment of the present invention in the open state.

[0027] Explanation of reference numerals in the attached drawings: 10, housing; 11, air inlet; 12, exhaust port; 20, exhaust balance valve; 21, valve seat; 211, mounting hole; 22, valve core; 23, breathable membrane; 24, through hole; 25, drive unit; 26, valve stem; 27, radial sealing ring; 28, inner sealing ring; 29, outer sealing ring. Detailed Implementation

[0028] 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, and 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. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0029] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations 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 the actual implementation. In the 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.

[0030] With the rapid development of new energy vehicles globally, the market is experiencing explosive growth due to their significant energy-saving and emission-reduction advantages and high level of intelligence. However, along with this growth, the failure rate of battery packs is also rising, particularly posing serious challenges to the sealing and safety of battery packs. How to detect battery pack failures early and effectively reduce the severity of accidents has become a critical issue that the industry urgently needs to address.

[0031] Currently, battery pack sealing tests primarily rely on rigorous battery inspection during manufacturing to ensure the battery pack has good airtightness upon leaving the factory. However, after the battery pack is installed in the vehicle, its airtightness cannot be continuously monitored. If the battery pack leaks or becomes damp, it is usually only discovered when the internal insulation monitoring system detects the problem and triggers an alarm. By then, the battery pack has often already suffered some damage, potentially leading to more serious safety issues such as battery thermal runaway, endangering the safety of the vehicle's occupants.

[0032] To maintain pressure balance within the battery pack, traditional battery pack designs typically incorporate a balancing valve. However, in extreme water-related environments, the airtightness of the battery pack can be challenged, leading to seal failure and consequently affecting the pack's safety and reliability.

[0033] In addition, to reduce condensation caused by excessive humidity inside the battery pack, some battery packs are equipped with desiccants. These desiccants maintain a dry environment inside the battery pack by absorbing moisture. However, the moisture absorption capacity of desiccants is limited. When the battery pack is exposed to a humid environment for a long time, the desiccant easily becomes saturated and ineffective, failing to provide sustained moisture protection. As a result, the internal humidity of the battery pack may gradually increase, thus accelerating the damage to the battery pack.

[0034] Therefore, current technologies for monitoring the waterproofing, moisture resistance, and airtightness of battery packs still have certain shortcomings. Especially in harsh environments, battery packs may face risks such as airtightness failure, excessive humidity, and moisture infiltration, severely impacting their performance and safety. How to achieve real-time monitoring and active protection of battery packs during operation, ensuring their sealing and stability under various environments, has become an important research topic in the field of new energy vehicles.

[0035] To achieve the above objectives and other related objectives, such as Figure 1 As shown, this utility model proposes a battery pack, including a housing 10, an exhaust balance valve 20, a control unit, and an inflation device. The housing 10 of the battery pack has a receiving cavity for accommodating a stack of battery cells. The receiving cavity provides sufficient space for the battery pack to accommodate and secure the stack of battery cells, and ensures that each cell of the stack is in the proper position and environment during normal operation.

[0036] The housing 10 has an exhaust port 12 that connects the receiving cavity to the outside atmosphere. An exhaust balance valve 20 is located at the exhaust port 12, and the exhaust balance valve 20 is mainly used to regulate the balance of air pressure inside and outside the battery pack. The exhaust balance valve 20 is connected to the control unit and can automatically adjust according to the operating status of the battery pack.

[0037] The control unit is specifically the Battery Management System (BMS), which can be located in the electrical compartment of the battery pack (not shown in the figure). The control unit is responsible for managing and monitoring various operating parameters of the battery pack, including battery temperature, voltage, charge / discharge status, and airtightness. Based on the battery pack's operating conditions, the control unit can control the opening and closing of the exhaust balance valve 20, thereby regulating the air pressure environment of the battery pack.

[0038] The inflation device is used to inflate the containment cavity. Specifically, the inflation device can be an electric compressor or gas tank located within the vehicle. The inflation device communicates with and connects to the control unit. When the battery pack faces external water pressure threats, the control unit can activate the inflation device to inflate the battery pack with gas (such as air). By increasing the air pressure inside the battery pack, it ensures that the internal air pressure is higher than the external water pressure, preventing moisture from seeping into the battery pack.

[0039] The control unit is configured to close the exhaust balance valve 20 and activate the inflation device to maintain positive pressure within the containment cavity. When the battery pack is submerged in water, the exhaust balance valve 20 can be closed and air can be actively injected into the battery pack to ensure that the pressure inside the battery pack is greater than or equal to the external water pressure, thus preventing water from entering the battery pack.

[0040] When the battery pack faces external water pressure (such as in a flooded environment or during rainy weather) or when the driver issues a wading command, the control unit will instruct the exhaust balance valve 20 to close, cutting off the entry of external air. Simultaneously, the control unit activates the inflation device to inflate the containment cavity, adjusting the air pressure inside the battery pack to a level higher than the external water pressure, thereby effectively preventing moisture from entering the battery pack through the vent 12. Through this active inflation method, the battery pack can continuously maintain a sealed and dry environment, significantly improving its resistance to water penetration.

[0041] In an optional embodiment of this invention, a liquid level sensor is further included for detecting the water level outside the battery pack. The liquid level sensor is a sensing device used to detect the water level outside the battery pack. It can accurately sense changes in the water level around the battery pack, especially when the battery pack faces the risk of wading or immersion, and promptly provide feedback on the water level. Liquid level sensors typically operate based on technologies such as float sensors, pressure sensors, ultrasonic sensors, or capacitor sensors, and can effectively detect changes in water level.

[0042] The control unit communicates with the liquid level sensor, which feeds back the real-time water level data. Upon receiving the data, the control unit determines whether waterproofing measures are necessary based on a preset water level threshold.

[0043] The control unit monitors the water accumulation outside the battery pack in real time by receiving feedback information from the liquid level sensor. When the liquid level sensor detects that the external water level has reached a certain threshold, the control unit responds and actively controls the battery pack's waterproofing system. Specific measures include:

[0044] Close the exhaust balance valve 20: Once the water level exceeds the preset threshold, the control unit will close the exhaust balance valve 20 to cut off the connection between the outside air and the inner cavity of the battery pack, preventing moisture from entering the battery pack through the exhaust port 12.

[0045] Start inflation device: At the same time, the control unit starts the inflation device to inflate the battery pack, maintain positive pressure in the battery pack cavity, and ensure that the air pressure inside the battery pack is greater than the external water pressure, thereby preventing moisture from seeping into the battery pack through any gaps.

[0046] The battery pack uses a liquid level sensor to monitor the height of external water in real time, preventing unforeseen water seepage when the water level is too high. The combination of the liquid level sensor and the control unit allows the battery pack to react quickly to water accumulation, adjusting internal and external air pressure to ensure its safety in wet environments. The control unit responds automatically based on real-time data without manual intervention. The intelligent linkage between the liquid level sensor, the inflation device, and the exhaust balance valve 20 makes the battery pack's waterproofing system more intelligent and automated. Users need not worry about the battery pack's safety in wet or water-filled environments; the system will automatically detect and take appropriate protective measures.

[0047] In an optional embodiment of this invention, a pressure sensor is installed inside the receiving cavity. The pressure sensor detects the pressure within the cavity and is communicatively connected to the control unit. The primary function of the pressure sensor is to actively monitor changes in the battery pack's pressure. During normal operation of the battery pack, the pressure should remain stable and not fluctuate significantly due to changes in the external environment or internal leaks. By continuously monitoring the pressure within the receiving cavity, the system can promptly detect any abnormalities, such as pressure drops or leaks, thereby determining whether the airtightness is satisfactory.

[0048] In an optional embodiment of this invention, the control unit processes the real-time data fed back by the pressure sensor and determines the airtightness. The control unit is configured to: close the exhaust balance valve 20, start the inflation device until the air pressure in the containment cavity reaches the target threshold, and measure the rate of decrease of the air pressure in the containment cavity using the pressure sensor to determine whether the airtightness of the battery pack is intact.

[0049] Specifically, when the battery pack needs to undergo an airtightness test, the vehicle control unit (VCU) sends a command to the control unit, instructing the control unit to switch to the "active airtightness test" mode.

[0050] Once the pressure sensor and control unit establish communication, the control unit will close the exhaust balance valve 20, cutting off the connection between the external air and the inner cavity of the battery pack, and perform an inflation operation by controlling the inflation device to inject gas (usually air) into the battery pack until the air pressure inside the battery pack reaches the set target threshold.

[0051] The vehicle-controlled compressor begins inflating the battery pack. The inflation pressure, relative to atmospheric pressure (typically 101.3 kPa), typically ranges from 0.1 kPa to 20 kPa, and is usually set to 3.5 kPa. The inflation pressure setting must consider the pressure-bearing capacity of the battery pack materials and structure. Within this pressure range, airtightness testing is possible without damaging the battery pack. The inflation process lasts for a period of time, typically 60 seconds, but the specific time can be set as needed, ranging from 1 second to 10 minutes. The holding time depends on actual application requirements, environmental conditions, and other factors. Too short a time may be insufficient to detect leaks, while too long a time may waste energy and testing time.

[0052] If there is a leak inside the battery pack (e.g., due to poor sealing or damage to certain components), the air pressure will gradually decrease. Using real-time feedback from the air pressure sensor, the control unit calculates the rate of pressure change and the total amount of change. Based on the leakage rate, the amount of gas leaking can be estimated (usually expressed as gas flow rate per unit time).

[0053] If the leakage exceeds the preset standard (such as the set allowable leakage amount), it indicates that the battery pack is not airtight and needs to be repaired or replaced. Conversely, if the leakage is within the normal range, it indicates that the battery pack is airtight.

[0054] Once the airtightness test is complete, the exhaust balance valve 20 will reopen, restoring the normal ventilation function of the battery pack and ensuring that the battery pack can continue to operate under normal environmental conditions.

[0055] The above solution monitors the battery pack's airtightness in real time. If a leak or other sealing problem occurs, the pressure sensor immediately reports data, and the control unit detects the pressure change and triggers a warning. This allows vehicle owners to receive timely warnings and take action before the problem escalates, preventing battery damage, fire, or other safety hazards caused by airtightness issues. When the system detects an airtightness failure, the owner can repair or replace the battery pack's sealing components at an early stage. This not only prevents larger failures but also reduces repair costs and downtime through timely repairs. For example, a minor sealing failure may only require replacing the sealing ring or performing localized repairs, while a serious leak might necessitate replacing the entire battery pack.

[0056] In an optional embodiment of this invention, a humidity sensor is installed inside the housing cavity. The humidity sensor detects the humidity within the housing cavity and is communicatively connected to the control unit. The humidity sensor monitors humidity changes within the battery pack housing cavity. Under normal circumstances, the battery pack should be kept in a dry environment. If the internal humidity is too high, moisture may seep into the battery, causing a short circuit, or even leading to overheating or fire. Excessive humidity can also cause corrosion of internal metal components, shortening the battery's lifespan. A high humidity environment may affect the battery's chemical reaction efficiency, thereby impacting its performance and lifespan.

[0057] In an optional embodiment of this utility model, the inflation device includes a dry hot air source, the main function of which is to provide dry hot air to the battery pack. Specifically, the dry hot air source can be an electric hot air blower, a vehicle hot air system, etc. The inflation device can be connected to the dry hot air source. The control unit is configured to open the exhaust balance valve 20 based on humidity information detected by the humidity sensor and start the inflation device to introduce dry hot air into the receiving cavity through the dry hot air source. By cooperating with the dry hot air source, the inflation device inflates dry hot air into the battery pack, removing condensate from inside the battery pack and thus preventing moisture from affecting the battery system. The dry hot air source (such as an electric hot air blower or a vehicle hot air system) is mainly used to heat and dry the gas inside the battery pack, ensuring that the humidity of the battery pack remains within a safe range and preventing electronic component failure due to moisture.

[0058] Specifically, when the humidity sensor of the battery pack or the vehicle system detects abnormal humidity (such as excessive humidity or excessive temperature difference), the vehicle control and management system (VCU) will send a "drying and draining" command to the control unit to activate the "active drying and draining" mode.

[0059] The air filling device begins operation, filling the battery pack with dry, hot air. The temperature of the hot air is typically set between 40°C and 55°C. This temperature range helps to quickly evaporate moisture without placing an excessive heat load on the battery.

[0060] At the same time, the exhaust balance valve 20 discharges moisture containing water vapor, avoiding safety hazards caused by excessive humidity inside the battery pack.

[0061] Once the humidity sensor inside the battery pack detects that the humidity inside the battery pack has returned to normal levels, the control unit will automatically stop the inflation device and end the "drying and draining" mode.

[0062] In one optional embodiment of this invention, multiple humidity sensors are installed in different areas of the receiving cavity to monitor humidity changes in each area in real time. Since moisture may accumulate in certain areas of the battery pack, a single sensor may not be able to fully reflect the humidity status of the entire battery pack. Multiple sensors can provide more refined humidity data, helping the system to more accurately adjust the drying process.

[0063] Multiple exhaust balance valves 20 are provided for different areas of the receiving cavity. Used in conjunction with a humidity sensor, these valves can individually control the airflow and moisture discharge in different areas. Based on feedback from the humidity sensor, the control unit can activate the exhaust balance valve 20 of a specific area to ensure timely moisture removal from each area, preventing excessive localized moisture that could lead to condensation or short circuits within the battery pack.

[0064] like Figures 2-5As shown, the exhaust balance valve 20 includes a valve seat 21 and a valve core 22. The valve seat 21 is a key part of the exhaust balance valve; it is part of the valve body and is usually made of corrosion-resistant material, used to support and fix the valve core 22. The valve seat 21 has a through hole 24, which is covered with a breathable membrane 23. The main function of the breathable membrane 23 is to prevent moisture or impurities from entering the battery pack. The breathable membrane 23 is made of microporous polymer material (such as PTFE) or other breathable materials, characterized by allowing gas to pass freely while effectively preventing the infiltration of moisture and liquids. The breathable membrane 23 can also resist the entry of external dust or other particulate contaminants, thereby protecting the internal components of the battery pack. The valve core 22 is arranged coaxially with the through hole 24. The drive unit 25 is responsible for controlling the movement of the valve core 22, and is usually composed of an electric drive, pneumatic drive, or hydraulic drive mechanism. In some cases, the drive unit 25 can also control a pressure sensor through circuitry to sense pressure changes inside the battery pack and automatically adjust the state of the valve core 22. The valve core 22 is connected to the drive unit 25, which is used to drive the valve core 22 to block or disengage from the through hole 24.

[0065] like Figures 2-5 As shown, the valve seat 21 has a mounting hole 211, and the valve core 22 has a valve stem 26 for insertion into the mounting hole 211. The valve stem 26 is connected to the drive unit 25, which drives the valve stem 26 to slide within the mounting hole 211 to allow the valve core 22 to block or disengage from the through hole 24. The linear movement of the valve stem is directly controlled by the drive unit 25 (such as a motor or electromagnet), enabling rapid opening and closing of the through hole 24. The sliding fit design between the valve stem 26 and the mounting hole 211 simplifies the valve structure and reduces the number of parts, making it particularly suitable for scenarios where internal space is limited in a battery pack.

[0066] The drive unit 25 is a linear drive unit, specifically a worm gear structure. The worm gear structure provides precise control. Its structural characteristics include high torque, smooth transmission, and high control accuracy, making it ideal for regulating the opening and closing state of the valve core 22. This allows for precise control of the exhaust process based on changes in humidity within the battery pack, ensuring that moisture is released at the appropriate time.

[0067] like Figures 2-5As shown, a radial sealing ring 27 is provided between the peripheral wall of the valve stem 26 and the inner wall of the mounting hole 211. An inner sealing ring 28 is provided between the end of the valve stem 26 near the receiving cavity and the end of the mounting hole 211 near the receiving cavity. An outer sealing ring 29 is provided between the side of the valve core 22 near the receiving cavity and the valve seat 21. The radial sealing ring 27, the inner sealing ring 28, and the outer sealing ring 29 can be made of O-rings, fluororubber, etc. The elastic deformation of the radial sealing ring 27, the inner sealing ring 28, and the outer sealing ring 29 compensates for the wear gap between the valve stem 26 and the mounting hole 211, as well as between the valve core 22 and the valve seat 21, reducing the risk of seal failure after long-term use.

[0068] like Figure 1 As shown, the inflation device includes an air inlet 11, which is located on the side wall of the housing 10. This means that the inflation air will enter the battery pack from the side. This design generally ensures more uniform airflow and avoids concentrated airflow that could cause localized overheating or moisture buildup. The position of the air inlet 11 also facilitates smoother airflow inside the battery pack, thereby removing more moisture and condensation.

[0069] like Figure 1 As shown, the exhaust port 12 is located on the side wall of the housing 10. The exhaust port 12 and the air inlet 11 are located on different side walls of the housing 10. The openings on different side walls can flexibly match the internal air duct of the battery pack, without the need for additional airflow guiding structures. The exhaust port 12 and the air inlet 11 can work in conjunction with the exhaust balance valve 20 to expel moisture accumulated inside the battery pack. The relative positional relationship between the exhaust port 12 and the air inlet 11 allows moisture to be discharged from the housing 10 through natural convection, preventing moisture from accumulating in specific locations inside the battery pack and reducing the risk of condensation.

[0070] In summary, this invention combines an exhaust balance valve 20 with an inflation device. When the battery pack faces external water pressure threats, it actively inflates to maintain positive pressure within the battery pack, ensuring the internal air pressure is higher than the external water pressure, thus preventing water infiltration. This plays a crucial role in ensuring the safety of the battery pack in water-related environments. This invention incorporates a humidity sensor, a pressure sensor, and a liquid level sensor, enabling real-time monitoring of the battery pack's internal and external environment. The humidity sensor prevents short circuits or corrosion caused by excessive moisture, the pressure sensor detects airtightness, and the liquid level sensor provides timely feedback in water-risk environments. The inflation device, in conjunction with a drying heat source, effectively removes water vapor by heating and drying the air inside the battery pack when abnormal humidity is detected, preventing moisture damage to the battery. The airtightness detection mode in this invention monitors changes in air pressure within the containment cavity using the pressure sensor to determine if a leak is detected. If a leak is detected, the control unit can close the exhaust balance valve 20 and activate the inflation device to replenish the air, ensuring the airtightness remains within acceptable limits. This design allows for early detection of leaks, preventing major malfunctions. The entire system employs intelligent linkage, with the control unit automatically adjusting the battery pack's air pressure and humidity based on real-time sensor data. No manual intervention is required; the system automatically assesses the situation and takes appropriate protective measures, enhancing both ease of use and safety.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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”.

[0077] 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.

[0078] 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.

[0079] 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, characterized in that, include: The housing (10) has a receiving cavity for accommodating the battery cell stack, and the housing (10) has an exhaust port (12) that connects the receiving cavity to the outside atmosphere; An exhaust balance valve (20) and a control unit, wherein the exhaust balance valve (20) is disposed at the exhaust port (12) and is communicatively connected to the control unit; An inflation device for inflating the receiving cavity, the inflation device being communicatively connected to the control unit; The control unit is configured to close the exhaust balance valve (20) and activate the inflation device to maintain positive pressure in the containment cavity.

2. The battery pack according to claim 1, characterized in that, It also includes a level sensor for detecting the height of water accumulation outside the battery pack. The control unit is communicatively connected to the level sensor and is configured to close the exhaust balance valve (20) and start the inflation device to maintain positive pressure in the containment cavity based on the water accumulation height detected by the level sensor.

3. The battery pack according to claim 1, characterized in that, A pressure sensor is installed inside the cavity, which can detect the pressure inside the cavity and is communicatively connected to the control unit.

4. The battery pack according to claim 3, characterized in that, The control unit is configured to: close the exhaust balance valve (20), start the inflation device until the air pressure in the containment cavity reaches the target threshold, and measure the rate of decrease of the air pressure in the containment cavity by the air pressure sensor to determine whether the airtightness of the battery pack is intact.

5. The battery pack according to claim 1, characterized in that, A humidity sensor is installed inside the cavity, which can detect the humidity inside the cavity and is communicatively connected to the control unit.

6. The battery pack according to claim 5, characterized in that, The inflation device includes a dry hot air source, and the control unit is configured to: open the exhaust balance valve (20) according to the humidity information detected by the humidity sensor, and start the inflation device to introduce dry hot air into the receiving cavity through the dry hot air source.

7. The battery pack according to claim 6, characterized in that, Multiple humidity sensors are provided in different areas of the receiving cavity, and multiple exhaust balance valves (20) are provided in corresponding areas of the receiving cavity.

8. The battery pack according to claim 1, characterized in that, The exhaust balance valve (20) includes a valve seat (21) and a valve core (22). The valve seat (21) has a through hole (24) and a breathable membrane (23) is covered on the through hole (24). The valve core (22) is arranged coaxially with the through hole (24) and is connected to a drive unit (25). The drive unit (25) is used to drive the valve core (22) to block the through hole (24) or to disengage from the through hole (24).

9. The battery pack according to claim 8, characterized in that, The valve seat (21) is provided with a mounting hole (211), and the valve core (22) is provided with a valve stem (26) for inserting into the mounting hole (211). The valve stem (26) is connected to the drive unit (25), and the drive unit (25) is used to drive the valve stem (26) to slide in the mounting hole (211) so that the valve core (22) blocks the through hole (24) or disengages from the through hole (24).

10. The battery pack according to claim 9, characterized in that, A radial sealing ring (27) is provided between the peripheral wall of the valve stem (26) and the inner wall of the mounting hole (211). An inner sealing ring (28) is provided between the end of the valve stem (26) near the receiving cavity and the end of the mounting hole (211) near the receiving cavity. An outer sealing ring (29) is provided between the side of the valve core (22) near the receiving cavity and the valve seat (21).

11. The battery pack according to claim 1, characterized in that, The inflation device includes an air inlet (11) which is located on the side wall of the box (10), and the exhaust port (12) and the air inlet (11) are located on different side walls of the box (10).

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