Waterproof package shell for special lithium battery

Abstract

The utility model discloses a waterproof package shell for special lithium battery, including upper casing and lower casing, the butt joint of upper casing and lower casing forms the containing chamber, the butt joint end surface of upper casing is provided with the flange edge of extending outward in the circumference, the lower surface of flange edge is provided with the sealing groove, the butt joint end surface of lower casing is provided with the flange of extending upward in the circumference, the outside wall and the inside wall of flange between form secondary sealing cavity, the secondary sealing cavity is filled with the water -swelling sealant strip of meeting, forms emergency sealing layer. Through multiple sealing structure further improves the waterproof effect of structure, and the interference fit of main seal ring and flange inside high plane, the combination pressure tight boss intensifies the lamination, realizes daily efficient waterproof dustproof, the water -swelling adhesive tape in secondary sealing cavity can automatically expand and block the water seepage when the main seal fails, forms reliable bottom -up protection, and the waterproof reliability is improved greatly.

Description

Technical Field

[0001] This utility model relates to the field of battery packaging shell technology, specifically a waterproof packaging shell for special lithium batteries. Background Technology

[0002] Specialty lithium batteries are widely used in special scenarios such as outdoor communications, mining equipment, and underwater exploration. These scenarios often involve harsh conditions such as rain, wading, salt spray, and strong vibration, placing extremely high demands on the waterproof sealing, structural stability, and environmental tolerance of the battery packaging shell. Current lithium battery packaging shell waterproofing designs mostly rely on a single sealing ring. The reliability of the seal is easily affected by sealing ring aging, assembly errors, or vibration wear. Once the seal fails, external water and dust can directly seep into the shell, easily causing battery short circuits, module damage, and other malfunctions. Furthermore, there is a lack of effective emergency protection mechanisms to cope with the risk of sudden water leakage after seal failure. Utility Model Content

[0003] In order to overcome the shortcomings of existing technical solutions, this utility model provides a waterproof packaging shell for special lithium batteries, which can effectively solve the problems mentioned in the background art.

[0004] The technical solution adopted by this utility model to solve its technical problem is:

[0005] A waterproof packaging shell for a special lithium battery includes an upper shell and a lower shell. The upper shell and the lower shell are joined to form a receiving cavity. The joining end face of the upper shell is provided with an outwardly extending flange edge in the circumferential direction. A sealing groove is formed on the lower surface of the flange edge.

[0006] The mating end face of the lower housing is provided with an upwardly extending flange in the circumferential direction. A secondary sealing cavity is formed between the outer wall of the flange and the inner wall of the flange edge. The secondary sealing cavity is filled with a water-swellable sealing strip to form an emergency sealing layer.

[0007] The sealing groove is fitted with a main sealing ring, and the bottom surface of the main sealing ring and the top surface of the flange are interference-fitted to form the main sealing surface.

[0008] As a further description of the above technical solution, a stepped portion is provided on one side of the flange, the stepped portion including an inner high plane and an outer low plane, the bottom surface of the main sealing ring is interference-fitted with the inner high plane, the outer low plane and the lower surface of the flange edge form an upper space of the secondary sealing cavity, and the water-swellable sealing strip is fixedly bonded to the outer low plane.

[0009] As a further description of the above technical solution, the flange edge of the upper housing has an annular pressure groove that is adapted to the outer contour, and the inner sidewall of the annular pressure groove extends downward to form a pressing boss.

[0010] As a further description of the above technical solution, an elastic buffer gasket is provided between the flange edges of the upper housing and the lower housing.

[0011] As a further description of the above technical solution, the inner sidewalls of the upper and lower housings are provided with anti-vibration limiting clips for fixing the lithium battery module, and the contact surface of the anti-vibration limiting clips is covered with a shock-absorbing rubber layer.

[0012] As a further description of the above technical solution, at least one drainage channel is provided on the bottom outer side of the lower housing, the inlet of the drainage channel is located at the bottom of the lower housing, and the outlet of the drainage channel is provided with a one-way vent valve.

[0013] As a further description of the above technical solution, the upper shell and the lower shell are integrally injection molded from glass fiber reinforced nylon or PPS engineering plastic, and their outer surfaces are coated with an anti-corrosion and insulating coating.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model discloses a waterproof packaging shell for a special lithium battery, which has at least one of the following beneficial effects during use:

[0016] The multi-layered sealing structure further enhances the waterproof performance. The main sealing ring is interference-fitted with the inner high-level plane of the flange, and the pressing boss reinforces the fit, achieving efficient daily waterproofing and dustproofing. The water-swellable rubber strip in the secondary sealing cavity automatically expands to block water leakage when the main seal fails, forming a reliable safety net and significantly improving waterproof reliability. Elastic buffer gaskets compensate for assembly errors, absorb vibrations, and prevent loosening of the sealing surface. The shock-absorbing limit latch with a shock-absorbing rubber layer can firmly fix the battery module and reduce vibration damage. The drainage channel in the lower shell works in conjunction with the one-way vent valve to drain accumulated water and balance air pressure, preventing shell deformation. The shell is made of glass fiber reinforced nylon or PPS through one-piece injection molding, with an outer anti-corrosion and insulating coating, combining high strength, high and low temperature resistance, and corrosion resistance, making it suitable for harsh environments such as outdoors and mines, and comprehensively ensuring the long-term stable operation of special lithium batteries. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a waterproof packaging shell for a special lithium battery according to the present invention;

[0018] Figure 2 This is a partial structural schematic diagram of a waterproof packaging shell for a special lithium battery according to the present invention;

[0019] Figure 3 This is a first perspective structural diagram of a waterproof packaging shell for a special lithium battery according to the present invention.

[0020] Figure 4This is a second perspective structural diagram of a waterproof packaging shell for a special lithium battery according to the present invention.

[0021] Numbering on the map:

[0022] 1. Upper housing; 101. Sealing groove; 102. Main sealing ring; 103. Elastic buffer pad; 104. Secondary sealing cavity; 2. Lower housing; 201. Anti-vibration limiting latch; 202. Flange; 203. Stepped section; 204. Receiving cavity; 205. Drainage channel; 206. One-way vent valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1-4 As shown, this utility model provides a waterproof packaging shell for special lithium batteries, including an upper shell 1 and a lower shell 2. The upper shell 1 and the lower shell 2 are joined to form a receiving cavity 204. The joining end face of the upper shell 1 is provided with an outwardly extending flange edge in the circumferential direction. A sealing groove 101 is provided on the lower surface of the flange edge.

[0025] The lower housing 2 has an upwardly extending flange 202 circumferentially arranged on the mating end face. A secondary sealing cavity 104 is formed between the outer wall of the flange 202 and the inner wall of the flange edge. The secondary sealing cavity 104 is filled with a water-swellable sealing strip to form an emergency sealing layer.

[0026] The outer low-level plane of the flange 202 of the lower housing 2 and the inner side wall of the flange edge of the upper housing 1 form a "secondary sealing cavity 104", which is filled with a water-swellable sealing strip. When the main seal fails due to aging, wear or other accidents, and a small amount of water seeps into the secondary sealing cavity 104, the sealing strip expands rapidly upon contact with water, filling the gaps in the cavity and automatically blocking further water penetration, forming an emergency backup defense line.

[0027] The sealing groove 101 is embedded with a main sealing ring 102, and the bottom surface of the main sealing ring 102 is interference-fitted with the top surface of the flange 202 to form a main sealing surface.

[0028] This embodiment achieves efficient sealing through structural interference fit and sealing element compression. The upper housing 1 has an outwardly extending flange edge on the circumferential mating end face. The sealing groove 101 on the lower surface of the flange edge is embedded with the main sealing ring 102, forming the basic sealing structure. The lower housing 2 has an upwardly extending flange 202 on the circumferential mating end face. One side of the flange 202 is designed as a stepped part 203, and its inner high plane forms a precise interference fit with the bottom surface of the main sealing ring 102.

[0029] During the assembly of the packaging shell, as the upper shell 1 and lower shell 2 are joined, the main sealing ring 102 is constrained by the flange sealing groove 101 and squeezed by the high-level plane inside the flange 202 of the lower shell 2, resulting in elastic deformation and fully filling the gap between the flange edge and the flange 202. At the same time, the pressing boss formed by the extension of the inner wall of the annular pressing groove that matches the outer contour of the flange edge of the upper shell 1 further applies pressure to the flange edge, ensuring a tight fit between the main sealing ring 102 and the sealing surface, thereby directly preventing external water, dust and other impurities from entering the receiving cavity 204, forming the first stable and reliable waterproof defense line.

[0030] The secondary emergency sealing system serves as a fallback protection structure after the main seal fails, achieving passive emergency sealing through a "chamber design + water-swellable material". Based on the stepped portion 203 design of the flange 202 of the lower shell 2, a closed "secondary sealing cavity 104" is formed between its outer low plane and the inner sidewall of the flange edge of the upper shell 1, and a water-swellable sealing strip is pre-fixed and bonded inside the cavity.

[0031] Under normal operating conditions, the secondary sealing cavity 104 is in standby mode. When the main seal fails to adhere due to aging, wear, or impact from external forces after long-term use, a small amount of external water may seep into the secondary sealing cavity 104. At this time, the water-swellable sealing strip inside the cavity quickly comes into contact with the water and expands in volume. The expanded strip fills the entire gap space of the secondary sealing cavity 104, forming a tight sealing barrier layer, effectively blocking further water penetration, providing emergency protection for the lithium battery, and avoiding damage to core components due to seal failure.

[0032] Furthermore, a stepped portion 203 is provided on one side of the flange 202. The stepped portion 203 includes an inner high plane and an outer low plane. The bottom surface of the main sealing ring 102 is interference-fitted with the inner high plane. The outer low plane and the lower surface of the flange edge form the upper space of the secondary sealing cavity 104. The water-swellable sealing strip is fixedly bonded to the outer low plane.

[0033] The main sealing ring 102 is embedded in the sealing groove 101 of the flange edge of the upper housing 1, and the inner high plane of the flange 202 of the lower housing 2 forms an interference fit with the bottom surface of the main sealing ring 102. After assembly, the main sealing ring 102 is squeezed to fill the gap, directly blocking external water and dust from entering the receiving cavity 204, forming the first and main waterproof defense line in daily use.

[0034] Furthermore, the flange edge of the upper housing 1 has an annular pressure groove that is adapted to the outer contour of the flange, and the inner wall of the annular pressure groove extends downward to form a pressing boss.

[0035] The elastic buffer gasket 103 between the quick-release gland and the flange edge can absorb structural deformation caused by vibration or temperature changes, while filling small assembly gaps, thus enhancing sealing stability and avoiding wear on the housing caused by rigid contact.

[0036] Furthermore, an elastic buffer gasket 103 is provided between the flange edges of the upper housing 1 and the lower housing 2.

[0037] The elastic buffer gasket 103 provided between the flange edges of the upper housing 1 and the lower housing 2 can compensate for the processing and assembly errors of the flange edges and the flange 202 during the assembly process, ensuring uniform contact of the main sealing surface; at the same time, when subjected to vibration or impact, the buffer gasket can absorb energy, reduce stress damage to the sealing structure, and maintain sealing stability.

[0038] Furthermore, the inner walls of the upper housing 1 and the lower housing 2 are provided with anti-vibration limiting clips 201 for fixing the lithium battery module, and the contact surface of the anti-vibration limiting clips 201 is covered with a shock-absorbing rubber layer.

[0039] The anti-vibration limiting latches 201 on the inner sidewalls of the upper and lower shells 2 are precisely matched with the lithium battery module to achieve mechanical fixation of the battery module and prevent displacement during transportation or use; the shock-absorbing rubber layer on the contact surface of the latch can absorb vibration energy through its own deformation, reducing fatigue damage to the internal structure of the lithium battery caused by vibration.

[0040] Furthermore, at least one drainage channel 205 is provided on the bottom outer side of the lower housing 2. The inlet of the drainage channel 205 is located at the bottom of the lower housing 2, and a one-way vent valve 206 is provided at the outlet of the drainage channel 205.

[0041] The drainage channel 205 on the outer side of the bottom of the lower shell 2 works in concert with the one-way vent valve 206 at the outlet. When a small amount of water accidentally seeps into the bottom of the shell, it can be discharged through the drainage channel 205. The one-way vent valve 206 can achieve pressure balance inside and outside the shell, avoid the shell from expanding or contracting due to temperature changes, and prevent external water from flowing back through the vent valve.

[0042] Furthermore, the upper shell 1 and the lower shell 2 are integrally injection molded from glass fiber reinforced nylon or PPS engineering plastic, and their outer surfaces are coated with an anti-corrosion and insulating coating.

[0043] The upper and lower shells 2 are integrally injection molded from glass fiber reinforced nylon or PPS engineering plastic. Both materials have the characteristics of high strength, wear resistance, and high and low temperature resistance, and can withstand mechanical impact and temperature fluctuations in special environments. The anti-corrosion and insulating coating on the outer surface can isolate corrosive media such as acids, alkalis and salt spray, while avoiding safety hazards caused by static electricity or leakage in the shell.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A waterproof packaging shell for a special lithium battery, characterized in that, It includes an upper shell and a lower shell, the upper shell and the lower shell are joined to form a receiving cavity, the joining end face of the upper shell is provided with an outwardly extending flange edge in the circumferential direction, and a sealing groove is formed on the lower surface of the flange edge; The mating end face of the lower housing is provided with an upwardly extending flange in the circumferential direction. A secondary sealing cavity is formed between the outer wall of the flange and the inner wall of the flange edge. The secondary sealing cavity is filled with a water-swellable sealing strip to form an emergency sealing layer. The sealing groove is fitted with a main sealing ring, and the bottom surface of the main sealing ring and the top surface of the flange are interference-fitted to form the main sealing surface.

2. The waterproof packaging shell for a special lithium battery according to claim 1, characterized in that: One side of the flange is provided with a stepped portion, which includes an inner high plane and an outer low plane. The bottom surface of the main sealing ring is interference-fitted with the inner high plane. The outer low plane and the lower surface of the flange edge form the upper space of the secondary sealing cavity. The water-swellable sealing strip is fixedly bonded to the outer low plane.

3. The waterproof packaging shell for a special lithium battery according to claim 2, characterized in that: The flange edge of the upper housing has an annular pressure groove that matches the outer contour, and the inner wall of the annular pressure groove extends downward to form a pressing boss.

4. The waterproof packaging shell for a special lithium battery according to claim 1, characterized in that: An elastic buffer pad is provided between the flange edges of the upper and lower housings.

5. A waterproof packaging shell for a special lithium battery according to claim 1, characterized in that: The inner walls of the upper and lower housings are provided with anti-vibration limiting clips for fixing the lithium battery module, and the contact surface of the anti-vibration limiting clips is covered with a shock-absorbing rubber layer.

6. The waterproof packaging shell for a special lithium battery according to claim 1, characterized in that: At least one drainage channel is provided on the bottom outer side of the lower housing. The inlet of the drainage channel is located at the bottom of the lower housing, and the outlet of the drainage channel is provided with a one-way vent valve.

7. A waterproof packaging shell for a special lithium battery according to claim 1, characterized in that: The upper and lower shells are integrally injection molded from glass fiber reinforced nylon or PPS engineering plastic, and their outer surfaces are coated with an anti-corrosion and insulating coating.

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