Waterproof structure of lithium battery used in deep water

Abstract

The utility model discloses a waterproof structure of a lithium battery used in deep water, which is characterized in that the waterproof structure comprises a shell and a cover body, a cavity is arranged in the shell, one end of the shell is provided with an integrally formed sealed bottom, the other end of the shell is provided with an opening, and the opening is used for placing the lithium battery and a circuit board into the cavity in the shell; the cover body is connected to the opening in a buckled mode and forms a sealed state. A conductive terminal is arranged on the cover body; the circuit board is electrically connected with the lithium battery and the conductive terminal respectively; the remaining space in the cavity is filled with sealant, and the gap between the cover body and the shell is filled with the sealant. In conclusion, the battery still has the waterproof capability under the conditions of deep water and relatively large water pressure, so that the battery can be normally used, water inlet damage is avoided, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of waterproof batteries, in particular to a waterproof structure for using lithium batteries in deep water. Background Art

[0002] With the development of science and technology, the in-depth underwater exploration, the development of underwater equipment is becoming more and more common. Most underwater equipment such as underwater cameras and underwater boosters require power support, which brings about the demand for underwater power supplies. The shell of the underwater power supply is equipped with corresponding positive and negative output terminals. The end outside the shell is used to connect external equipment, and the other end inside the shell is directly connected to the circuit board on the battery pack.

[0003] However, in the traditional production process, due to structural limitations, the battery pack and the positive and negative output terminals need to be connected by wire welding before the battery pack is placed in the shell, and then the positive and negative output terminals are fixedly connected to the shell. Therefore, most of the fixed connections between the positive and negative output terminals and the shell are screwed or glued. These two methods not only have the problems of cumbersome assembly process and low production efficiency, but also because of the gaps between the positive and negative output terminals and the shell, the sealing of the shell is reduced. When the battery is working in deep water areas, under the action of strong water pressure, seawater may penetrate from the assembly gap, causing electrochemical corrosion, and even seawater may penetrate into the shell, causing the entire battery to be scrapped.

[0004] A Chinese patent document with a publication (announcement) number of CN208690334U discloses a waterproof structure for a battery pack, including a battery shell composed of a battery upper shell and a battery lower shell, wherein a space for installing a battery pack is arranged in the battery shell, and a plurality of battery cells are installed in the battery lower shell through a first bracket and a second bracket, wherein the first bracket and the second bracket are arranged in parallel, and a plurality of support holes for installing the battery cells are opened on the first bracket and the second bracket, and the two ends of the battery cells pass through the support holes on the first bracket and the second bracket respectively, and a first nickel sheet and a third nickel sheet are respectively installed on the outer sides of the first bracket and the second bracket, and the inner sides of the first nickel sheet and the third nickel sheet are in contact with the ends of the battery cells, and are used for directly connecting the plurality of battery cells in series or / and in parallel, and the first nickel sheet and the third nickel sheet are electrically connected with waterproof rubber plug terminal wires with an integrated structure.

[0005] As in the above technical solution, waterproofing is mainly achieved by waterproof rubber plugs, and its waterproof effect is limited. When used in deep water areas with a certain water pressure, it is more likely to cause the waterproof effect to fail, thereby causing battery damage.

[0006] In addition, the current underwater lithium battery waterproofing solution can also be to seal the upper and lower shell covers with glue, but some customers have waterproofing requirements of 20 meters or even deeper underwater. At this time, it is necessary to improve the relevant structure and process to achieve the expected waterproof effect. Utility Model Content

[0007] The utility model aims to overcome the above-mentioned shortcomings and provide a technical solution that can solve the above-mentioned problems.

[0008] The utility model provides a waterproof structure for using lithium batteries in deep water, comprising a shell and a cover body, wherein a cavity is arranged inside the shell, one end of the shell is provided with an integrally formed sealing bottom, and the other end of the shell is provided with an opening, wherein the opening is used to place the lithium battery and a circuit board into the inner cavity of the shell; the cover body is snap-fitted and connected to the opening to form a sealed state; the cover body is provided with conductive terminals, and the circuit board is electrically connected to the lithium battery and the conductive terminals respectively; the remaining space in the cavity is filled with sealant, and the sealant fills the gap between the cover body and the shell.

[0009] As a further solution of the utility model: a welding groove is provided on the inner wall of the opening end of the shell, and a welding protrusion is provided on the cover body corresponding to the welding groove. The welding groove and the welding protrusion cooperate with each other to fix the cover body to the opening end of the shell.

[0010] As a further solution of the utility model: the cover body is provided with an integrally formed cylindrical boss, the interior of the cylindrical boss is hollow, one end of the conductive terminal is fixedly connected to the circuit board, and the other end is inserted into the internal hollow of the cylindrical boss and fixedly connected with the cylindrical boss.

[0011] As a further solution of the utility model: an annular groove is provided at one end of the cylindrical boss close to the circuit board, a sealing ring is provided in the annular groove, the sealing ring is sleeved on the conductive terminal, and its outer wall abuts against the inner wall of the annular groove, the inner wall diameter of the sealing ring is slightly smaller than the outer wall diameter of the conductive terminal, and the outer wall diameter of the sealing ring is slightly larger than the inner wall diameter of the annular groove.

[0012] As a further solution of the utility model: an annular stopper is provided at one end of the cylindrical boss away from the circuit board, and the annular stopper abuts against the conductive terminal, thereby limiting the conductive terminal.

[0013] As a further solution of the utility model: a docking groove is further provided on the outer periphery of one end of the cylindrical boss away from the circuit board, and the docking groove is used to accommodate a docking protrusion of an electrical terminal of an external electrical appliance.

[0014] As a further solution of the utility model: a reinforcing rib is further provided on the inner side of the bottom of the shell, and the reinforcing rib is fixedly connected to the inner wall of the bottom of the shell.

[0015] As a further solution of the utility model: the outer side wall of the shell is further provided with a reinforcement ring, and the reinforcement ring is fixedly connected to the outside of the side wall of the shell, so as to strengthen the side wall of the shell.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. By filling the entire cavity inside the shell with sealant, the sealant can fill all the gaps between the cover and the shell, thereby achieving complete sealing of the joints and achieving a better waterproof effect. In addition, all gaps are filled with sealant, and after the sealant has solidified for a certain period of time, stress conduction can be formed inside the shell, thereby evenly conducting the water pressure in the deep water area to the inner wall of the shell, thereby avoiding the problem of deformation of the shell or cover under pressure, which leads to water seepage.

[0018] 2. A welding groove may be provided on the shell, and a welding protrusion may be provided on the cover. The welding groove and the welding protrusion cooperate with each other and are welded together by ultrasonic welding technology to form a fixed connection with stronger force, thereby further improving the pressure bearing capacity of the joint between the cover and the shell.

[0019] 3. A sealing ring can also be set between the conductive terminal and the cylindrical boss, and the annular groove can be used to limit the sealing ring. At the same time, the size of the sealing ring can be set to be slightly larger, so that the sealing ring can be squeezed into the annular groove, and a better abutment can be formed with the conductive terminal, further improving the waterproof ability.

[0020] Therefore, after the above-mentioned improvements, the utility model can provide a waterproof structure for using lithium batteries in deep water, so that the battery can still have waterproof capabilities when in deep water with relatively high water pressure, so that it can be used normally, avoid water seepage damage, and extend its service life.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 It is a schematic diagram of the structure of the shell and cover body of the utility model after being decomposed;

[0024] Figure 2 It is a schematic cross-sectional view of the entirety of the utility model;

[0025] Figure 3 It is a cross-sectional schematic diagram of the conductive terminal and the sealing ring of the utility model;

[0026] Figure 4 It is a schematic diagram of the exploded structure of the conductive terminal and the sealing ring of the utility model;

[0027] Figure 5 It is a schematic diagram of the structure of the conductive terminal of the utility model;

[0028] Figure 6 It is a structural schematic diagram of the cover body of the utility model;

[0029] Figure 7 It is a structural schematic diagram of the shell of the utility model.

[0030] The reference numerals and names in the figures are as follows:

[0031] 10 housing; 11 cavity; 12 bottom; 13 opening; 14 welding groove; 15 reinforcing rib; 16 reinforcing ring; 20 cover; 21 conductive terminal; 22 welding protrusion; 30 cylindrical protrusion; 31 annular groove; 32 sealing ring; 33 annular block; 34 docking groove; 41 lithium battery; 42 circuit board; 43 insulating support plate; 44 conductive welding plate. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 7 In an embodiment of the utility model, a waterproof structure for using lithium batteries in deep water includes a shell 10 and a cover 20. The shell 10 is provided with a cavity 11 inside, one end of which is provided with an integrally formed sealing bottom 12, and the other end of which is provided with an opening 13, the opening 13 is used to place a lithium battery 41 and a circuit board 42 into the cavity 11 inside the shell 10; the cover 20 is snap-fitted and connected to the opening 13 to form a sealed state; the cover 20 is provided with a conductive terminal 21, and the circuit board 42 is electrically connected to the lithium battery 41 and the conductive terminal 21 respectively; the remaining space in the cavity 11 is filled with sealant, and the sealant fills the gap between the cover 20 and the shell 10.

[0034] Specifically, in order to use the corresponding battery in water with a certain depth, it is necessary to design it to be waterproof and pressure-resistant. Preferably, the bottom 12 is made by an integral injection molding process, so that the waterproof and pressure-resistant ability of the bottom 12 can be guaranteed to the greatest extent. In order to place components such as the lithium battery 41 and the circuit board 42, an opening 13 is also required to be provided at one end of the housing 10, so as to facilitate assembly and production.

[0035] Secondly, before fixing the cover 20, liquid insulating sealant can be filled into the internal cavity 11 of the housing 10 so that it can fill the gap between the inner wall of the housing 10 and other installed parts. Of course, the filling amount of sealant should not be too much, so as to avoid overflow when the cover 20 is buckled; of course, the filling amount should not be too little, and it is preferred to reach the maximum filling amount that the housing 10 can withstand. After filling a certain amount of sealant, the cover 20 can be buckled at the opening 13 of the housing 10, and the conductive terminal 21 can be located at the correct position of the cover 20, so that the external electrical appliance can be powered.

[0036] Next, the cover body 20 and the shell 10 can be ultrasonically welded after being buckled, forming a fixed connection with stronger force, further improving the pressure-bearing capacity of the joint between the cover body 20 and the shell 10. After ultrasonic welding, there may be a certain tiny gap at the joint between the cover body 20 and the shell 10, which may have waterproof ability under normal water pressure, but after being in a deep water area, under the influence of water pressure, the tiny gap may become larger, and even water seepage may occur. Therefore, the sealant filled before the cover body 20 is buckled can now play the role of sealing the tiny gap, so that the battery can still have the effect of pressure resistance and waterproof even after being in a deep water area. In addition, the above-mentioned ultrasonic welding process preferably makes a full circle of weld lines, so as to minimize the generation of tiny gaps from a technological perspective.

[0037] Moreover, in order to further improve the effect of the sealant on sealing the tiny gap between the cover 20 and the shell 10 to resist pressure and waterproof, the cover 20 can be ultrasonically welded during the production process while the sealant is still in a liquid state. After the welding is completed, the entire battery assembly can be turned upside down, that is, after the shell 10 is turned upside down, the cover 20 is located at the bottom, so that the sealant can flow to the cover 20 position, thereby filling the circuit board 42 area of ​​the battery head and filling the connection between the cover 20 and the shell 10 after ultrasonic welding, and filling and blocking the tiny gap after the connection to the maximum extent. Continue to maintain the inverted state until the sealant is completely cured, so that the area between the cover 20 and the opening 13 can be waterproof and pressure-resistant to the maximum extent.

[0038] like Figure 1 and Figure 4As shown, preferably, a welding groove 14 is provided on the inner wall of the opening 13 end of the shell 10, and a welding protrusion 22 is provided at a position of the cover body 20 corresponding to the welding groove 14. The welding groove 14 and the welding protrusion 22 cooperate with each other to fix the cover body 20 to the opening 13 end of the shell 10.

[0039] Specifically, in order to further improve the stability and pressure resistance of ultrasonic welding, corresponding welding grooves 14 and welding protrusions 22 may be provided so that when ultrasonic welding is performed, the welding grooves 14 and welding protrusions 22 may be welded together to form a more stable connection. Figure 2 In the state shown in the middle cross section, after the welding protrusion 22 is fixedly welded to the corresponding welding groove 14, the possibility of the generation of tiny gaps can be further reduced.

[0040] like Figures 1 to 5 As shown, preferably, the cover body 20 is provided with an integrally formed cylindrical boss 30, the interior of the cylindrical boss 30 is hollow, one end of the conductive terminal 21 is fixedly connected to the circuit board 42, and the other end thereof is inserted into the internal hollow of the cylindrical boss 30 and is fixedly connected to the cylindrical boss 30. An annular groove 31 is provided at one end of the cylindrical boss 30 close to the circuit board 42, and a sealing ring 32 is provided in the annular groove 31. The sealing ring 32 is sleeved on the conductive terminal 21, and its outer wall abuts against the inner wall of the annular groove 31. The inner wall diameter of the sealing ring 32 is slightly smaller than the outer wall diameter of the conductive terminal 21, and the outer wall diameter of the sealing ring 32 is slightly larger than the inner wall diameter of the annular groove 31.

[0041] Specifically, in order to provide the power in the battery assembly to external devices, corresponding conductive terminals 21 need to be provided. It is understandable that in order to connect the conductive terminals 21, corresponding through holes need to be provided on the cover 20 for external connection of the conductive terminals 21. If the through holes are not specially treated, there is also a risk of water seepage.

[0042] Therefore, the corresponding cylindrical protrusion 30 can be made on the cover body 20 by an integrated molding process, and the cylindrical protrusion 30 is sleeved on the outer periphery of the conductive terminal 21 to reduce the risk of water leakage. However, since the conductive terminal 21 and the cover body 20 are made of different materials, and both are relatively hard materials, there is also a risk of water seepage on the contacting surfaces. Therefore, a sealing ring 32 with a certain elasticity and better sealing performance can be sleeved on the conductive terminal 21.

[0043] A corresponding annular groove 31 can also be provided at the position of the cylindrical boss 30 facing the inside of the housing 10 to accommodate and fix the sealing ring 32. The size of the sealing ring 32 is made to have a certain margin, so that it can be compressed and filled into the annular groove 31 to achieve the best waterproof and pressure-resistant effect. At the same time, in the above-mentioned production process, when the battery assembly is inverted to cure the sealant, the sealant can also be prevented from flowing out after inversion. In addition, the sealing ring 32 is preferably a waterproof and pressure-resistant rubber ring with glue to further improve its waterproof and pressure-resistant effect.

[0044] like Figure 3 As shown, preferably, an annular stopper 33 is provided at one end of the cylindrical boss 30 away from the circuit board 42, and the annular stopper 33 abuts against the conductive terminal 21, thereby limiting the conductive terminal 21. A docking groove 34 is also provided on the outer periphery of one end of the cylindrical boss 30 away from the circuit board 42, and the docking groove 34 is used to accommodate the docking protrusion of the power terminal of the external electrical appliance.

[0045] Specifically, in order to prevent the conductive terminal 21 from shifting and causing a gap during the plugging and unplugging of the external device, thereby preventing the risk of water seepage, an annular stopper 33 may be provided at the outermost end of the cylindrical boss 30, and the conductive terminal 21 may be limited by the annular stopper 33 so that the conductive terminal 21 may be firmly held in the corresponding position. In addition, it should be noted that the conductive terminal 21 preferably has an isolation portion (not shown in the figure) inside, so as to prevent water leakage from the hole of the conductive terminal 21 itself.

[0046] In addition, in order to strengthen the docking with the power terminal of the external device, a corresponding docking groove 34 can be provided on the outer periphery of the cylindrical protrusion 30, and a corresponding docking protrusion (not shown in the figure) is provided on the power terminal of the external device (not shown in the figure). After the power terminal is inserted into the conductive terminal 21, the docking protrusion and the docking groove 34 are engaged with each other, thereby further improving the waterproof effect.

[0047] like Figure 2 , Figure 6 and Figure 7 As shown, preferably, a reinforcing rib 15 is further provided on the inner side of the bottom 12 of the shell 10, and the reinforcing rib 15 is fixedly connected to the inner wall of the bottom 12 of the shell 10 and is substantially in the shape of a cross. A reinforcing ring 16 is further provided on the outer side wall of the shell 10, and the reinforcing ring 16 is fixedly connected to the outside of the side wall of the shell 10, so as to strengthen the side wall of the shell 10.

[0048] Specifically, in order to further improve the pressure resistance of the entire battery assembly, corresponding reinforcing ribs 15 can be provided on the inner side of the bottom 12 of the shell 10. The cross-shaped reinforcing ribs 15 can strengthen the pressure bearing capacity of the bottom 12, prevent the bottom 12 from deforming, and eliminate the risk of water seepage caused by breaking the cover 20. In addition, since the battery assembly is in an elongated shape as a whole, and has a relatively long plate-like structure on both sides of the shell 10, in order to improve the pressure resistance of the plate-like structure, a corresponding reinforcing ring 16 can be provided on the plate-like structure. The arc structure of the reinforcing ring 16 can resist the pressure of the external equipment on the plate-like structure, thereby preventing the plate-like structure from deforming.

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A waterproof structure using lithium batteries in deep water, characterized in that: The invention comprises a shell (10) and a cover (20), wherein a cavity (11) is arranged inside the shell (10), one end of which is provided with an integrally formed sealing bottom (12), and the other end of which is provided with an opening (13), wherein the opening (13) is used to place a lithium battery (41) and a circuit board (42) into the cavity (11) inside the shell (10); the cover (20) is buckled and connected to the opening (13) to form a sealed state; the cover (20) is provided with a conductive terminal (21), and the circuit board (42) is electrically connected to the lithium battery (41) and the conductive terminal (21) respectively; and the remaining space in the cavity (11) is filled with a sealant, and the sealant fills the gap between the cover (20) and the shell (10).

2. A waterproof structure for deep-water lithium batteries according to claim 1, characterized in that: A welding groove (14) is provided on the inner wall of the opening (13) end of the shell (10), and a welding protrusion (22) is provided on the cover body (20) at a position corresponding to the welding groove (14). The welding groove (14) and the welding protrusion (22) cooperate with each other so that the cover body (20) is fixedly connected to the opening (13) end of the shell (10).

3. A waterproof structure for deep-water lithium batteries according to claim 1, characterized in that: The cover body (20) is provided with an integrally formed cylindrical convex column (30), the interior of the cylindrical convex column (30) is hollow, one end of the conductive terminal (21) is fixedly connected to the circuit board (42), and the other end is inserted into the hollow interior of the cylindrical convex column (30) and is fixedly connected to the cylindrical convex column (30).

4. A waterproof structure for deep-water lithium batteries according to claim 3, characterized in that: An annular groove (31) is provided at one end of the cylindrical protrusion (30) close to the circuit board (42), a sealing ring (32) is provided in the annular groove (31), the sealing ring (32) is sleeved on the conductive terminal (21), and its outer wall abuts against the inner wall of the annular groove (31), the inner wall diameter of the sealing ring (32) is slightly smaller than the outer wall diameter of the conductive terminal (21), and the outer wall diameter of the sealing ring (32) is slightly larger than the inner wall diameter of the annular groove (31).

5. A waterproof structure for deep-water lithium batteries according to claim 3, characterized in that: An annular stopper (33) is provided at one end of the cylindrical protrusion (30) away from the circuit board (42); the annular stopper (33) abuts against the conductive terminal (21), thereby limiting the conductive terminal (21).

6. A waterproof structure for deep-water lithium batteries according to claim 3, characterized in that: A docking groove (34) is also provided on the outer periphery of one end of the cylindrical protrusion (30) away from the circuit board (42), and the docking groove (34) is used to accommodate a docking protrusion of an electrical terminal of an external electrical appliance.

7. A waterproof structure for deep-water lithium batteries according to claim 1, characterized in that: A reinforcing rib (15) is also provided on the inner side of the bottom (12) of the shell (10), and the reinforcing rib (15) is fixedly connected to the inner wall of the bottom (12) of the shell (10).

8. The waterproof structure for deep-water lithium battery according to claim 1, characterized in that: The outer side wall of the shell (10) is further provided with a reinforcement ring (16), and the reinforcement ring (16) is fixedly connected to the outside of the side wall of the shell (10), thereby strengthening the side wall of the shell (10).

Images