Lithium battery pack air pressure expansion sealed box structure and method thereof

Abstract

The application discloses a kind of lithium battery pack air pressure expansion sealed box structure and method thereof.Structure includes bearing box, rubber box cover, gas charging and discharging mechanism and hook lock mechanism, and the top inner wall of bearing box is provided with convex edge;Rubber box cover is sleeved in the inner wall of bearing box, and the bottom end of rubber box cover is provided with extended eave, and the middle part of extended eave is concave and bent to form wrapping groove, and wrapping groove is interference fit with convex edge;Gas charging and discharging mechanism is connected in the inside of bearing box;Hook lock mechanism is movably arranged on bearing box and / or rubber box cover.The scheme not only relies on the rubber characteristics of rubber box cover and bearing box to carry out elastic extrusion fitting, but also fills the inside of bearing box by the way of air, to ensure that the flexible connection between rubber box cover and bearing box is always fitted, and under the filling and expansion of air pressure, to ensure that rubber box cover and bearing box are fitted, and then to ensure the sealing of the connection between the two, to ensure waterproof and dustproof effect.

Description

Technical Field

[0001] This invention relates to the field of battery sealing boxes, and in particular to a structure and method for a lithium battery pack gas pressure expansion sealing box. Background Technology

[0002] In the field of new energy battery technology, protective boxes are used to protect the battery cells of lithium battery packs. The sealing performance of the protective box is directly related to the electrical safety and service life of the battery system.

[0003] In existing technologies, battery pack housings and covers are mostly constructed using bent metal sheets or welded aluminum alloy profiles, and are mechanically secured by multiple circumferentially distributed bolts. This housing encapsulation solution requires tightening each bolt individually during the housing assembly process, which is cumbersome. It also requires consistent bolt torque to prevent the connection from warping and affecting the seal. Furthermore, under the vibration and impact conditions of long-term vehicle operation, the bolts are prone to loosening, resulting in uneven compression of the sealing gasket between the cover and the housing, which in turn creates tiny gaps. This reduces the waterproof and dustproof performance of the housing.

[0004] To address these issues, some existing technologies employ highly elastic rubber or inflatable rubber rings to fill the connection between the lid and the body of the container. However, relying solely on the interference fit between the rubber and the body limits the sealing pressure to the initial pre-compression of the rubber or inflatable rubber ring. Furthermore, after deformation occurs at the connection between the body and the lid, the rubber and inflatable rubber ring structures deform due to the pressure at this connection. When the deformation of the body or lid no longer exerts pressure on the rubber and inflatable rubber rings, without the force that promotes the deformation, existing containers and lids cannot guarantee a tight seal at the connection, resulting in a decrease in the waterproof and dustproof performance of the container.

[0005] In view of this, this solution proposes a structure and method for a lithium battery pack gas pressure expansion sealing box to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a structure and method for a lithium battery pack gas pressure expansion sealing housing to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a lithium battery pack gas pressure expansion sealed housing structure for sealed storage of the lithium battery pack body, comprising: The lithium battery pack body is loaded into the carrier housing, and the top inner wall of the carrier housing is provided with a raised edge; A rubber box cover is fitted onto the inner wall of the bearing box. The bottom end of the rubber box cover is provided with an extended lower edge. The middle part of the extended lower edge is concave and bent to form a wrapping groove. The wrapping groove is interference-fitted with the protruding edge to form a flexible connection between the bearing box and the rubber box cover. An inflation / deflation mechanism is connected through the interior of the support box and is used to inflate or deflate the support box. The hook-lock mechanism is movably mounted on the bearing box and / or the rubber box cover. When the inflation mechanism is inflated, it expands the extended lower edge, causing the wrapping groove to tightly adhere to the raised edge to form a sealing and pressing force. At the same time, it drives the hook-lock mechanism to extend and insert into the connection between the raised edge and the wrapping groove, forming a mechanical anti-detachment constraint.

[0008] Preferably, a locking air passage is provided on the inner wall of the bearing box at the protruding edge, both ends of the locking air passage are connected to the bearing box, the hook and lock mechanism is connected to the locking air passage, and a locking groove is provided on the concave surface of the wrapping groove.

[0009] Preferably, the hook-lock mechanism includes: A hook-shaped airbag is inserted through one end of the locking airway. After the hook-shaped airbag is inflated, it is inserted into the locking slot and locked with the locking slot. At the same time, it presses down the extended lower edge close to the supporting box. A filter plug is fitted onto the other end of the locking airway.

[0010] Preferably, the air inlet end of the hook-shaped airbag is provided with a connecting ring, which is sleeved inside the locking airway. The ring arm of the connecting ring is threadedly connected with multiple positioning bolts, which are threadedly connected to the protruding edge for communication between the air inlet and outlet of the hook-shaped airbag and the locking airway.

[0011] Preferably, the outer wall of the filter plug is provided with a sealing ring, which is sleeved inside the locking air passage to seal the gap between the locking air passage and the outer wall of the filter plug.

[0012] Preferably, a handle is fixedly connected to the top of the rubber box cover, and an inflation / deflation port is provided on the side wall of the carrying box. The inflation / deflation mechanism is connected to the carrying box through the inflation / deflation port.

[0013] Preferably, the inflation / deflation mechanism includes: A valve seat is inserted into the inflation / deflation port and its bottom is connected to the support box. An airflow channel is provided in the middle of the valve seat, and a sealing plug is provided on the inner wall of the airflow channel. A valve stem is slidably connected within the airflow channel. A sealing plug is fixedly connected to the stem wall of the valve stem. The valve stem slides within the airflow channel to engage or disengage with the sealing plug, thereby controlling the opening and closing of the airflow channel.

[0014] Preferably, the inner wall diameter of the sealing plug increases linearly from top to bottom, and the outer wall diameter of the sealing plug increases linearly from top to bottom. The maximum diameter of the outer wall of the sealing plug is less than or equal to the maximum diameter of the inner wall of the sealing plug, and greater than the minimum diameter of the inner wall of the sealing plug.

[0015] Preferably, a support spring is provided between the valve stem wall and the airflow channel. The support spring is located above the sealing plug and is used to drive the valve stem to move upward so that the sealing plug and the sealing plug fit together in a static state. A valve cover is detachably connected to the top of the valve seat.

[0016] A sealing method for a lithium battery pack gas pressure expansion sealing housing structure, employing the aforementioned lithium battery pack gas pressure expansion sealing housing structure, includes the following sealing method: The first step is to seal the lithium battery pack body using a potting process, and then load the sealed lithium battery pack body into the carrier box. The second step is to assemble the rubber box cover onto the top of the supporting box by using the interference fit between the groove and the raised edge. The third step is to connect the inflation mechanism to the inflation equipment and inflate the carrier box with air. After the air enters the carrier box, the rubber cover expands under the air pressure. At this time, the cover expands and fits tightly against the protruding edge after wrapping the groove, forming a seal. At the same time, the airflow enters the hook and lock mechanism, which inflates and extends to intersect at the connection between the wrapping groove and the raised edge. By blocking the wrapping groove, it restricts the extension of the lower edge from detaching from the supporting box. The fourth step is to stop inflating once the rubber cover has bulged and completely squeezed and wrapped around the connection with the carrier box. This completes the inflation and sealing of the lithium battery pack inside the carrier box.

[0017] The technical effects and advantages of this invention are as follows: (1) This solution not only relies on the rubber properties of the rubber box cover to elastically squeeze and fit with the carrier box, but also ensures that the flexible connection between the rubber box cover and the carrier box is always in place by inflating the carrier box with air. By the pressure of the air on the rubber box cover inside the carrier box, it is ensured that even after deformation occurs at the connection between the carrier box and the rubber box cover, the rubber box cover and the carrier box can still fit together under the expansion of the air pressure, thereby ensuring the sealing of the connection between the two and ensuring waterproof and dustproof effects.

[0018] (2) This solution uses a hook-shaped airbag to achieve a state change where the hook-shaped structure becomes more stable as it is inflated, thus ensuring that the hook-shaped airbag binds the rubber box cover and prevents the rubber box cover from slipping off the bearing box under the air pressure expansion state. This ensures that the connection between the rubber box cover and the bearing box is tight under the air pressure expansion, further ensuring the sealing performance of the rubber box cover and the bearing box. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a cross-sectional view of the overall structure of the present invention.

[0021] Figure 3 This is a schematic diagram of the overall structure of the present invention without the lithium battery pack body.

[0022] Figure 4 This is a cross-sectional view of the connection between the load-bearing box and the hook-locking mechanism of the present invention.

[0023] Figure 5 This is a schematic diagram of the top structure of the support box of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the rubber box cover of the present invention.

[0025] Figure 7 This is a cross-sectional view of the inflation / deflation mechanism of the present invention.

[0026] Figure 8 This is a schematic diagram of the hook-shaped airbag of the present invention.

[0027] Figure 9 This is a schematic diagram of the structure of the filter plug of the present invention.

[0028] In the diagram: 1. Carrying box; 101. Inflation / discharge port; 102. Raised edge; 103. Locking air passage; 2. Rubber box cover; 201. Extended lower edge; 202. Enclosing groove; 203. Locking hanging groove; 204. Handle; 3. Lithium battery pack body; 4. Valve seat; 401. Sealing plug; 5. Valve stem; 501. Sealing plug; 6. Top support spring; 7. Valve cover; 8. Hook-shaped airbag; 801. Connecting ring; 802. Positioning bolt; 9. Filter plug; 901. Sealing ring. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1: The present invention provides as follows Figure 1 - Figure 9 The diagram illustrates a pressure-expansion sealed enclosure structure for a lithium battery pack, used for the sealed storage of the lithium battery pack body 3. It includes a support enclosure 1, a rubber cover 2, a charging / discharging mechanism, and a hook-locking mechanism. The lithium battery pack body 3 is loaded into the support enclosure 1. The lithium battery pack body 3 is sealed using an encapsulation process before being loaded into the support enclosure 1. An installation structure for limiting the position of the lithium battery pack body 3 is provided within the support enclosure 1, thereby ensuring stable placement of the lithium battery pack body 3 within the support enclosure 1. The side of the support enclosure 1... The wall has an inflation / deflation port 101, which is a recessed area on the side wall of the sealing line 1. The bottom inner wall of this recessed area is connected to the interior of the bearing housing 1, allowing inflation / deflation operations to be performed into the bearing housing 1 through this connection. A raised flange 102 is provided on the top inner wall of the bearing housing 1. The raised flange 102 is integrally connected to the bearing housing 1 and is made of aluminum alloy. The side cross-section of the raised flange 102 consists of a raised structure at the top and a recessed structure at the bottom, as detailed below. Figure 4 As shown; specifically, a locking air passage 103 is provided on the inner wall of the supporting housing 1 at the protruding edge 102. Both ends of the locking air passage 103 are connected to the supporting housing 1. The locking air passage 103 passes through the middle of the protruding edge 102 structure, and one port of the locking air passage 103 is opened at the protruding structure at the top of the protruding edge 102, with the opening of the locking air passage 103 facing the center of the supporting housing 1. The other port of the locking air passage 103 is opened at the bottom of the concave structure at the bottom of the protruding edge 102. In the actual setting, the protruding edge 102 and the locking air passage 103 are positioned much higher than the inflation / deflation port 101. Because of the connection with the carrier box 1, when the air is filled through the air inlet 101, the high-pressure gas enters the interior of the carrier box 1 and gradually diffuses towards the top of the carrier box 1. At this time, the high-pressure gas will enter through the port of the locking air passage 103 located in the concave structure at the bottom of the protruding edge 102, and then be discharged from the end of the protruding structure at the top of the protruding edge 102.

[0031] A rubber box cover 2 is fitted onto the inner wall of the supporting box 1. The rubber box cover 2 is made of the same material as automobile tires and can be expanded by inflating it to follow its structural shape. An extended lower edge 201 is provided at the bottom of the rubber box cover 2. The extended lower edge 201 is made of the same material as the rubber box cover 2 and is integrally cast. The middle part of the extended lower edge 201 is concave and bent to form a wrapping groove 202. The wrapping groove 202 is interference-fitted with the raised edge 102. The concave shape and curvature of the wrapping groove 202 are adapted to the raised structure at the top of the raised edge 102, forming a flexible connection between the supporting box 1 and the rubber box cover 2. When the rubber box cover 2 is attached to the supporting box... When the body 1 is connected, the elasticity of the rubber box cover 2 structure allows for deformation and recovery, resulting in an interference fit between the top protrusion of the wrapping groove 202 and the top protrusion of the raised edge 102. Simultaneously, the bottom of the extended lower edge 201 fits into the bottom concave structure area of ​​the raised edge 102. This creates a flexible connection between the rubber box cover 2 and the supporting box 1, eliminating the need for repeated screw tightening and allowing for faster and more convenient assembly of the supporting box 1 and the rubber box cover 2. A locking groove 203 is provided on the concave surface of the wrapping groove 202. The opening direction of the locking groove 203 is opposite to the opening direction of the locking air passage 103 located at the top protrusion of the raised edge 102. A handle 204 is fixedly connected to the top of the rubber box cover 2. The handle 204 is made of the same material as the rubber box cover 2 and is integrally cast or bonded to it.

[0032] The inflation / deflation mechanism is connected to the interior of the carrier housing 1 and is used to inflate or deflate the carrier housing 1. The inflation / deflation mechanism is connected to the carrier housing 1 through the inflation / deflation port 101. Specifically, the inflation / deflation mechanism includes a valve seat 4 and a valve stem 5. The valve seat 4 is inserted into the inflation / deflation port 101 and its bottom is connected to the carrier housing 1. The bottom of the valve seat 4 is inserted into the connection between the inflation / deflation port 101 and the carrier housing 1, and the valve seat 4 is sealed and fixed to the connection. This ensures the position of the valve seat 4 and ensures that the gas in the carrier housing 1 can only pass through the opening at the top of the carrier housing 1 and the connection at the inflation / deflation port 101. With this structure, when the top opening of the carrier housing 1 is sealed with a rubber cover 2, the inflation / deflation operation of the carrier housing 1 can only be performed through the valve seat 4. An airflow channel is provided in the middle of the valve seat 4. The airflow channel is used to connect the valve seat 4 and the carrier housing 1, ensuring that the inflation / deflation operation of the carrier housing 1 is performed through the airflow channel. A sealing plug 401 is installed on the inner wall of the airflow channel. The outer wall of the sealing plug 401 is fixedly connected to the inner wall of the airflow channel, and the connection is sealed with glue to ensure that gas can only flow along the central opening of the sealing plug 401. The valve stem 5 is slidably connected in the airflow channel. A guide structure is provided between the valve stem 5 and the airflow channel to ensure that the valve stem 5 always slides and intersects in the central area of ​​the airflow channel. At the same time, the guide structure will not block the airflow channel, ensuring gas flow in the airflow channel. The stem wall of the valve stem 5 is intersected with the central opening of the sealing plug 401, and the diameter of the stem wall of the valve stem 5 is smaller than the diameter of the central opening of the sealing plug 401, ensuring that the central opening of the sealing plug 401 has a sealing function. The valve stem 5 is fixedly connected to a sealing plug 501 to the valve stem 5, which is a channel for gas flow. The fixing method between the sealing plug 501 and the valve stem 5 depends on the materials used to manufacture the valve stem 5 and the sealing plug 501. The goal is to ensure that the sealing plug 501 moves synchronously with the valve stem 5 and that the connection between the sealing plug 501 and the valve stem 5 is sealed. The sealing plug 501 slides within the airflow channel and engages or disengages from the sealing plug 401, controlling the opening and closing of the airflow channel. When the sealing plug 501 slides synchronously with the valve stem 5 within the airflow channel, the sealing plug 501 follows the valve stem 5. As the sealing plug 501 slides closer to the sealing plug 401, the outer wall of the sealing plug 501 gradually contacts the sealing plug 401. The inner wall of the sealing plug 501 is fitted to seal the channel of the sealing plug 401, blocking the flow of air. When the sealing plug 501 slides away from the sealing plug 401, the fit between the sealing plug 501 and the sealing plug 401 is released, and the middle part of the sealing plug 401 is opened for gas to flow, allowing gas to enter and exit normally. Furthermore, the inner wall diameter of the sealing plug 401 increases linearly from top to bottom, and the outer wall diameter of the sealing plug 501 increases linearly from top to bottom. The maximum diameter of the outer wall of the sealing plug 501 is less than or equal to the maximum diameter of the inner wall of the sealing plug 401, and greater than the minimum diameter of the inner wall of the sealing plug 401. It should be noted that both the sealing plug 501 and the sealing plug 401 are made of rubber material. The sealing plug 501 and the sealing plug 401 both have trapezoidal side cross-sectional profiles. Through the matching of their diameters, as the sealing plug 501 gradually approaches the sealing plug 401 through sliding, the trapezoidal interlocking action allows the sealing plug 501 to gradually seal the sealing plug 401. Furthermore, through the elastic deformation of the rubber material, the sealing plug 501 ensures that the opening in the middle of the sealing plug 401 is sealed after it fits into the middle of the sealing plug 401. The shape settings of the sealing plug 501 and the opening of the sealing plug 401 ensure that the sealing plug 501 forms a barrier after interlocking with the sealing plug 401, thus ensuring the stable filling and sealing of the sealing plug 501 at the sealing plug 401.

[0033] A support spring 6 is installed between the stem wall of the valve stem 5 and the airflow channel. The support spring 6 is located above the sealing plug 501. The support spring 6 is used to drive the valve stem 5 to move upward, so that the sealing plug 501 and the sealing block 401 can fit together in the static state. A sealing ring is fixedly connected to the top stem wall of the valve stem 5. The sealing ring, together with the sealing block 401, restricts the support spring 6. In the static state, since the sealing block 401 is not moving, the support spring 6 drives the valve stem 5 to move away from the valve seat 4 by supporting the sealing ring. At this time, the valve stem 5 drives the sealing plug 501 to move synchronously, so that the sealing plug 501 is inserted into the middle opening of the sealing block 401 and fits together. The airflow channel is now sealed. Therefore, when it is necessary to vent air into the carrier box 1 through the airflow channel, the valve stem 5 needs to be pressed down to release the seal between the sealing plug 501 and the sealing plug 401. At this time, the operation of filling or releasing air into the carrier box 1 can be realized. The top of the valve seat 4 is detachably connected to the valve cover 7. The outer wall of the top of the valve seat 4 is provided with an external thread structure, and the inner wall of the valve cover 7 is provided with an internal thread structure. Through the threaded engagement between the internal thread structure and the external thread structure, the valve cover 7 is detachably connected to the top of the valve seat 4, thereby covering and protecting the top of the valve seat 4 and avoiding the problem of air filling and releasing interference caused by the accumulation of debris in the airflow channel of the valve seat 4.

[0034] The hook-lock mechanism is movably mounted on the bearing housing 1 and / or the rubber cover 2. In this configuration, the hook-lock mechanism is connected to the locking air passage 103. When the inflation / deflation mechanism is inflated, the expanding extension lower edge 201 expands, causing the wrapping groove 202 to tightly adhere to the protruding edge 102 to form a sealing and pressing force. At the same time, the hook-lock mechanism is driven to extend and intersect at the connection between the protruding edge 102 and the wrapping groove 202, forming a mechanical anti-detachment constraint. Specifically, the hook-lock mechanism includes a hook-shaped airbag 8 and a filter plug 9. The hook-shaped airbag 8 extends through one end of the locking airway 103. The hook-shaped airbag 8 is made of the same material as the inner tube of a car, and both side walls and the sealed end of the hook-shaped airbag 8 are thickened or hardened to ensure the stability of the hook shape after inflation and to ensure that the hook shape has the strength to resist bending. The air inlet of the hook-shaped airbag 8 is connected to the port of the top protruding structure of the protruding edge 102 of the locking airway 103 to realize inflation and deflation through this port. After the hook-shaped airbag 8 is inflated, it is inserted into the locking slot 203. The hook-shaped airbag 8 and the locking slot 203 are locked simultaneously. The extended lower edge 201 is pressed close to the supporting box 1. After the hook-shaped airbag 8 is inflated, its hook-shaped end bends towards the center area of ​​the supporting box 1, thus inserting into the locking groove 203 and hooking downwards onto the inner wall of the locking groove 203. This presses down on the inner wall of the locking groove 203, thereby pressing down on the extended lower edge 201. This prevents the extended lower edge 201 from detaching from the groove 202 and the protrusion edge 102 after inflation, ensuring the stability of the connection between the rubber box cover 2 and the supporting box. At the same time, during the inflation process, the structure of the hook-shaped airbag 8 expands more stably, and the downward pressure is also more stable. Within the expansion range of the rubber box cover 2, the extended lower edge 201 expands... The expansion causes the encasing groove 202 to fit more tightly with the raised edge 102, ensuring a seal at the connection between the rubber box cover 2 and the carrier box 1, thereby achieving dust and water protection; the filter plug 9 is sleeved on the other end of the locking airway 103; furthermore, the air inlet end of the hook-shaped airbag 8 is provided with a connecting ring 801, which is sleeved inside the locking airway 103. The ring arm of the connecting ring 801 is threadedly connected with multiple positioning bolts 802, which are threadedly connected to the raised edge 102, so that the air inlet and outlet of the hook-shaped airbag 8 can communicate with the locking airway 103. The locking airway 103 has an opening on the inner wall of the port of the raised structure at the top of the raised edge 102. The annular groove is adapted to the connecting ring 801. After the connecting ring 801 is inserted into the annular groove, it is locked by the insertion of the positioning bolt 802, and the connecting ring 801 is stably connected at the port of the locking airway 103. The connection between the connecting ring 801 and the hook-shaped airbag 8 is a soft connection. When the hook-shaped airbag 8 is inflated, the part of the hook-shaped airbag 8 inserted in the locking airway 103 supports the hook-shaped airbag 8, preventing the hook-shaped airbag 8 from bending under pressure. When the air is discharged, the hook-shaped airbag 8 can be squeezed when the rubber box cover 2 is removed through the soft connection of the hook-shaped airbag 8, releasing the hook lock of the hook-shaped airbag 8 on the rubber box cover 2, and ensuring the stable removal of the rubber box cover 2.A sealing ring 901 is provided on the outer wall of the filter plug 9. The sealing ring 901 is fitted inside the locking air passage 103 to seal the gap between the locking air passage 103 and the outer wall of the filter plug 9. The filter plug 9 is inserted into the port of the locking air passage 103 located in the concave structure at the bottom of the protruding edge 102. At the same time, the sealing ring 901 ensures that the gas entering the locking air passage 103 can only flow through the middle of the filter plug 9. The filter plug 9 is designed to prevent impurities from entering the locking air passage 103 and blocking it. The filter plug 9 is also designed to facilitate cleaning after removal, avoiding the inconvenience of cleaning after the locking air passage 103 is blocked.

[0035] Example 2: This invention provides a sealing method for a lithium battery pack gas pressure expansion sealing housing structure, using a lithium battery pack gas pressure expansion sealing housing structure as described in Example 1, including the following sealing method: The first step is to seal the lithium battery pack body 3 using a potting process. After sealing the lithium battery pack body 3 with potting, it is ensured that the lithium battery pack body 3 has pressure resistance, thereby ensuring that the battery structure inside the lithium battery pack body 3 will not be damaged by pressure after the air is filled into the sealing structure of the carrier box 1 and the rubber box cover 2. Then, the sealed lithium battery pack body 3 is loaded into the carrier box 1. After the lithium battery pack body 3 is restrained in the carrier box 1, the sealing structure of the carrier box 1 and the rubber box cover 2 will wrap and protect the lithium battery pack body 3. The second step is to assemble the rubber box cover 2 onto the top of the carrier box 1 by using the interference fit between the wrapping groove 202 and the protrusion 102. After aligning the rubber box cover 2 with the top opening of the carrier box 1, press the rubber box cover 2 down. The extended lower edge 201 will be deformed under pressure and slide along the side wall of the protrusion 102 until the wrapping groove 202 and the protrusion 102 are fitted together. The third step involves connecting the inflation / deflation mechanism to the inflation device, which then inflates the bearing housing 1. After the gas enters the bearing housing 1, the rubber cover 2 expands under the air pressure. At this time, the wrapped groove 202 expands and then tightly adheres to the raised edge 102, forming a seal. The valve cover 7 is then unscrewed and connected to the inflation device through the top of the valve seat 4. When the air pressure of the inflation device is insufficient to drive the valve stem 5 to move down and open the airflow channel, it is necessary to assist in pressing down the valve stem 5. When the air pressure is sufficient to drive the valve stem 5 to move down, the valve stem 5 drives the sealing plug 501 to move down synchronously. During the downward movement of the sealing plug 501, it disengages from the sealing plug 401, and the airflow channel is opened. High-pressure gas enters the bearing housing 1, gradually filling the space inside the bearing housing 1 and expanding the rubber cover 2. After the rubber cover 2 expands from the inside, its lower edge 201 extends and tightly adheres to the raised edge 102, and the wrapped groove 202 tightly adheres to the raised edge 102, thus achieving a seal at the connection between the rubber cover 2 and the bearing housing 1. Simultaneously, airflow enters the hook-lock mechanism, which inflates and extends, intersecting at the connection between the wrapping groove 202 and the raised edge 102. By blocking the wrapping groove 202, it restricts the extension lower edge 201 from detaching from the carrier box 1. The gas entering the carrier box 1 fills the hook-shaped airbag 8 along the locking air passage 103. The hook-shaped airbag 8 expands and intersectes in the locking groove 203, pressing down on the inner wall of the locking groove 203 to prevent the extension lower edge 201 from slipping off the raised edge 102, further ensuring the sealing of the connection between the rubber box cover 2 and the carrier box 1. Fourth step: After the rubber box cover 2 bulges up and completely squeezes and wraps around the connection with the carrier box 1, stop the inflation. At this time, remove the inflation equipment (and release the downward pressure on the valve stem 5). The air pressure in the carrier box 1 and the top support spring 6 will drive the valve stem 5 to move upward. At this time, the sealing plug 501 is inserted into the middle of the sealing plug 401 and then blocks the airflow channel. The inflation and sealing of the lithium battery pack body 3 in the carrier box 1 is completed. Then screw the valve cover 7 on the top of the valve seat 4.

[0036] When it is necessary to open the rubber box cover 2, first unscrew the valve cover 7, then press down on the valve stem 5. After the sealing plug 501 and the sealing plug 401 are separated, the gas in the bearing box 1 will be discharged through the airflow channel. At this time, press the valve stem 5 and lift the rubber box cover 2. The hook-shaped airbag 8 will be squeezed and bend to release the gas. During the upward pulling process, the lower edge 201 of the rubber box cover 2 will slide off the protruding edge 102 through deformation until the connection between the rubber box cover 2 and the bearing box 1 is released.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pressure-expanding sealed enclosure structure for lithium battery packs, used for the sealed storage of the lithium battery pack body (3), characterized in that, include: The lithium battery pack body (3) is loaded inside the carrier box (1), and the top inner wall of the carrier box (1) is provided with a raised flange (102). A rubber box cover (2) is fitted onto the inner wall of the bearing box (1). The bottom end of the rubber box cover (2) is provided with an extended lower edge (201). The middle part of the extended lower edge (201) is concave and bent to form a wrapping groove (202). The wrapping groove (202) is interference-fitted with the protruding edge (102) to form a flexible connection between the bearing box (1) and the rubber box cover (2). An inflation / deflation mechanism is connected through the interior of the bearing housing (1) and is used to inflate or deflate the bearing housing (1). The hook-lock mechanism is movably mounted on the bearing box (1) and / or the rubber box cover (2). When the inflation mechanism is inflated, it expands the extended lower edge (201) to make the wrapping groove (202) tightly adhere to the protruding edge (102) to form a sealing and pressing force. At the same time, it drives the hook-lock mechanism to extend and insert into the connection between the protruding edge (102) and the wrapping groove (202) to form a mechanical anti-detachment constraint.

2. The lithium battery pack gas pressure expansion sealed housing structure according to claim 1, characterized in that, The inner wall of the carrying box (1) is provided with a locking air passage (103) located at the protruding edge (102). Both ends of the locking air passage (103) are connected to the carrying box (1). The hook and lock mechanism is connected to the locking air passage (103). The inner concave surface of the wrapping groove (202) is provided with a locking hanging groove (203).

3. The lithium battery pack gas pressure expansion sealed housing structure according to claim 2, characterized in that, The hook-lock mechanism includes: A hook-shaped airbag (8) is inserted through one end of the locking airway (103). After the hook-shaped airbag (8) is inflated, it is inserted into the locking groove (203) and locked with the locking groove (203). At the same time, it presses down the extended lower edge (201) close to the supporting box (1). A filter plug (9) is fitted onto the other end of the locking airway (103).

4. The lithium battery pack gas pressure expansion sealed housing structure according to claim 3, characterized in that, The air inlet of the hook-shaped airbag (8) is provided with a connecting ring (801), which is sleeved in the locking airway (103). The ring arm of the connecting ring (801) is threadedly connected with multiple positioning bolts (802), which are threadedly connected to the protruding edge (102) for the air inlet and outlet of the hook-shaped airbag (8) to communicate with the locking airway (103).

5. The lithium battery pack gas pressure expansion sealed housing structure according to claim 3, characterized in that, The outer wall of the filter plug (9) is provided with a sealing ring (901), which is sleeved in the locking air passage (103) to block the gap between the locking air passage (103) and the outer wall of the filter plug (9).

6. The lithium battery pack gas pressure expansion sealed housing structure according to claim 1, characterized in that, The top of the rubber box cover (2) is fixedly connected to a handle (204), and the side wall of the bearing box (1) is provided with an air inlet (101). The air inlet mechanism is connected to the bearing box (1) through the air inlet (101).

7. The lithium battery pack gas pressure expansion sealed housing structure according to claim 6, characterized in that, The inflation / deflation mechanism includes: The valve seat (4) is inserted into the air inlet (101) and its bottom is connected to the bearing box (1). An airflow channel is provided in the middle of the valve seat (4), and a sealing plug (401) is provided on the inner wall of the airflow channel. The valve stem (5) is slidably connected to the airflow channel. The valve stem (5) is fixedly connected to a sealing plug (501) on its stem wall. The valve stem (5) slides within the airflow channel to engage or disengage with the sealing plug (401) to control the opening and closing of the airflow channel.

8. The lithium battery pack gas pressure expansion sealed housing structure according to claim 7, characterized in that, The inner wall diameter of the sealing plug (401) increases linearly from top to bottom, and the outer wall diameter of the sealing plug (501) increases linearly from top to bottom. The maximum diameter of the outer wall of the sealing plug (501) is less than or equal to the maximum diameter of the inner wall of the sealing plug (401), and greater than the minimum diameter of the inner wall of the sealing plug (401).

9. The lithium battery pack gas pressure expansion sealed housing structure according to claim 7, characterized in that, A top support spring (6) is provided between the stem wall of the valve stem (5) and the airflow channel. The top support spring (6) is located above the sealing plug (501). The top support spring (6) is used to drive the valve stem (5) to move upward, so that the sealing plug (501) and the sealing plug (401) can fit together in a static state. A valve cover (7) is detachably connected to the top of the valve seat (4).

10. A sealing method for a lithium battery pack gas pressure expansion sealing box structure, employing the lithium battery pack gas pressure expansion sealing box structure as described in any one of claims 1-9, characterized in that, Including the following sealing methods: The first step is to seal the lithium battery pack body (3) using a potting process, and then load the sealed lithium battery pack body (3) into the carrier box (1). The second step is to assemble the rubber box cover (2) onto the top of the supporting box body (1) by using the interference fit between the wrapping groove (202) and the protrusion (102); The third step is to connect the inflation mechanism to the inflation device and inflate the bearing box (1) with the inflation mechanism. After the gas enters the bearing box (1), the rubber box cover (2) expands under the air pressure. At this time, the wrapped groove (202) expands and then closely adheres to the protruding edge (102) to form a seal. At the same time, the airflow enters the hook and lock mechanism, the hook and lock mechanism is inflated and extends and intersects at the connection between the wrapping groove (202) and the raised edge (102), and by blocking the wrapping groove (202), it restricts the extension of the lower edge (201) from separating from the supporting box (1); Fourth step: After the rubber box cover (2) bulges up and completely squeezes and wraps around the connection with the carrier box (1), stop the inflation. The inflation and sealing of the lithium battery pack body (3) in the carrier box (1) is completed.

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