Sealed battery and underwater robot

Abstract

The invention discloses a sealed battery and an underwater robot, the sealed battery comprises a battery compartment, a placement rack is arranged in the battery compartment, a plurality of battery cells are arranged on the placement rack, an opening is formed in one end of the battery compartment, and the sealed battery further comprises a thickened sealing cover used for sealing the opening of the battery compartment; the thickened sealing cover is provided with the first expansion part; the battery compartment is provided with the second extension part close to the opening; the surrounding cover is arranged at the top end of the first extension part; the encircling sleeve is arranged on the outer side of the second extension part; the first connecting holes are formed in the first extension part, the second extension part and the surrounding cover; the surrounding cover and the surrounding sleeve are both provided with the second connecting holes. The surrounding cover and the surrounding sleeve are combined to form a rectangular sleeve, so that the rectangular sleeve is arranged on the outer sides of the first expansion part and the second expansion part in a sleeving mode, the sealing path is prolonged, binding force to the first expansion part can be enhanced, and therefore the problem of seawater leakage caused by deformation of the first expansion part is avoided.

Description

Technical Field

[0001] This application relates to the field of battery sealing technology, and in particular to a sealed battery and an underwater robot. Background Technology

[0002] Underwater robots are extreme-operation robots that work underwater, capable of diving to perform certain tasks in place of humans; they are also known as submersibles. Underwater robots are playing an increasingly important role in fields such as oil development, geological surveying, scientific research, aquaculture, underwater ship hull maintenance and cleaning, diving recreation, and urban pipeline inspection, and the underwater robot market is booming.

[0003] Energy systems are one of the key technologies limiting the development of underwater robots. Currently, underwater robots are powered by either shore-based power or self-contained power. While shore-based power offers unlimited range, the power cables generate significant drag, severely impacting the robot's maneuverability and speed, increasing energy consumption, and significantly increasing the operational complexity. Therefore, self-contained power or a hybrid system of shore-based and self-contained power is gradually becoming the mainstream power supply method for underwater robots.

[0004] The self-powered power supply mode requires carrying a power source. An external battery compartment is one way for underwater robots to carry a power source. The external battery compartment can be in direct contact with seawater, and the battery can be cooled by the seawater. This reduces the need for cooling structures and thus reduces the weight of the external battery compartment. Therefore, it has been widely used in the field of underwater robots.

[0005] However, the impact of water pressure on the sealing of the attached battery compartment is one of the most critical challenges in the design of underwater robot battery compartments. In related technologies, ultrasonic welding is used to form annular grooves to improve the fit between the sealing ring and the groove, thereby enhancing the sealing effect. However, the welding process generates extremely high heat, which alters the heat treatment state of the compartment metal, leading to a decrease in the mechanical properties of the weld heat-affected zone, stress generation, and even microcracks. These microcracks may not be visible on land, but in the high-pressure environment of deep water, they can become the starting point for stress corrosion cracking (SCC) or directly cause high-pressure water infiltration, completely compromising the battery compartment's seal.

[0006] Therefore, it is necessary to propose a sealed battery and an underwater robot to improve the sealing performance of the battery compartment, which has become an important technical problem that needs to be solved urgently. Summary of the Invention

[0007] This application provides a sealed battery and an underwater robot, aiming to solve the problem in the prior art where annular grooves are formed by ultrasonic welding to improve the fit between the sealing ring and the annular groove, thereby improving the sealing effect. However, the welding process generates extremely high heat, which alters the heat treatment state of the battery compartment metal, leading to a decrease in the mechanical properties of the weld heat-affected zone, stress generation, and even microcracks. These microcracks may not be visible on land, but in the high-pressure environment of deep water, they can become the starting point for stress corrosion cracking (SCC) or directly cause high-pressure water to seep in, completely destroying the sealing performance of the battery compartment.

[0008] To achieve the above objectives, this application proposes a sealed battery, including a battery compartment, a shelf inside the battery compartment, a plurality of battery cells on the shelf, and an opening at one end of the battery compartment. The battery compartment also includes: a thickened cover for sealing the opening of the battery compartment; a first extension portion provided on the thickened cover; a second extension portion provided on the battery compartment near the opening; a surrounding cover provided at the top of the first extension portion; a surrounding sleeve provided on the outside of the second extension portion; a first connecting hole provided on the first extension portion, the second extension portion, and the surrounding cover; and a second connecting hole provided on the surrounding cover and the surrounding sleeve.

[0009] In some embodiments, the sleeve further includes a sealing bladder, wherein the sealing bladder is disposed on the inner side of the sleeve.

[0010] In some embodiments, the device further includes: an injection hole provided on the sleeve; a valve body provided on the sleeve, the injection hole communicating with the valve body, and a sealing bladder communicating with the valve body; a valve block movably provided inside the valve body; and an elastic element provided between the valve block and the valve body.

[0011] In some embodiments, it further includes: a first arcuate portion, which is disposed within the sleeve; and a second arcuate portion, which is disposed at the bottom end of the cover.

[0012] In some embodiments, it further includes: a pressure relief valve disposed in the sleeve, the pressure relief valve communicating with the sealing bladder.

[0013] In some embodiments, the device further includes: a partition disposed within the battery compartment, with a mounting bracket located on one side of the partition; and a rubber component disposed at the top of the partition, the rubber component abutting against a thickened cover.

[0014] In some embodiments, the battery compartment further includes a plurality of heat dissipation strips, with a plurality of heat dissipation strips spaced apart at both ends of the battery compartment.

[0015] In some embodiments, the device further includes a mounting bracket, wherein the bottom of the battery compartment is provided with the mounting bracket, and the battery compartment is mounted to the underwater robot via the mounting bracket.

[0016] In some embodiments, it further includes: a positioning element, wherein the positioning element is disposed at the bottom of the second extension, and the positioning element is used to position the sleeve.

[0017] In view of another objective of the present invention, the present invention provides the following technical solution: an underwater robot, wherein the underwater robot uses a sealed battery as described above.

[0018] This application proposes a sealed battery, including a battery compartment with a rack inside, on which several battery cells are arranged. One end of the battery compartment has an opening. The battery compartment also includes: a thickened cover for sealing the opening; a first extension portion; a second extension portion near the opening; a surrounding cover at the top of the first extension portion; a surrounding sleeve on the outside of the second extension portion; a first connecting hole on the first extension portion, the second extension portion, and the surrounding cover; and a second connecting hole on the surrounding cover and the surrounding sleeve. Specifically, the thickened cover resists water pressure and reduces its deformation, thus preventing seawater leakage due to deformation. The first and second extension portions extend the sealing path between the cover and the battery compartment, requiring high-pressure water to undergo multiple expansions, contractions, and sharp turns before theoretically entering the battery compartment, thereby improving the sealing performance of the battery compartment. The cover and sleeve combine to form a rectangular sleeve, which fits over the outside of the first and second extensions, further extending the sealing path. This forces high-pressure water to undergo more expansion, contraction, and sharp turns before theoretically entering the battery compartment, thus further improving the battery compartment's sealing performance. Furthermore, it enhances the binding force on the first extension, reducing its deformation under high-pressure seawater, thereby preventing seawater leakage caused by deformation of the first extension. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a three-dimensional structural diagram of a sealed battery according to an embodiment of this application; Figure 2 This is a bottom view of a sealed battery according to an embodiment of this application; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 2 Sectional view at point BB; Figure 5 for Figure 4 A magnified view of a section at point C; Figure 6 This is a schematic diagram of the disassembly structure of a sealed battery according to one embodiment of this application; Figure 7 This is a schematic diagram of the disassembly structure of a sealed battery after removing the sealing capsule in one embodiment of this application; Figure 8 for Figure 7 A magnified view of a section at point D; Figure 9 This is a schematic diagram of another disassembly structure of a sealed battery according to one embodiment of this application; Figure 10 This is a schematic diagram of the connection structure between the compensation valve and the sealing bladder in one embodiment of this application.

[0020] In the diagram: Battery compartment 1, heat sink 11, second extension 12, positioning part 121, abutment part 13, hanging part 2, third connecting hole 21, fourth mounting hole 22, second connecting hole 31, first connecting hole 32, cover 33, sleeve 34, injection hole 35, compensation valve 36, elastic part 361, connecting through hole 362, valve body 363, valve block 364, sealing bladder 37, injection port 371, first arc-shaped part 38, thickened cover 41, reinforcing rib 42, first extension 43, first electrical connector 5, locking nut 51, partition 6, rubber part 61, second electrical connector 62, placement rack 7, battery cell 8, sealing part 9. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0023] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0024] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0025] Example 1 See Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 and Figure 9 As shown, this application proposes a sealed battery, including a battery compartment 1, a placement rack 7 inside the battery compartment 1, and a plurality of battery cells 8 placed on the placement rack 7. One end of the battery compartment 1 has an opening. The battery compartment 1 also includes: a thickened cover 41 for sealing the opening of the battery compartment 1; a first extension 43 provided on the thickened cover 41; a second extension 12 provided on the battery compartment 1 near the opening; a cover 33 provided at the top of the first extension 43; a sleeve 34 provided on the outside of the second extension 12; a first connecting hole 32 provided on the first extension 43, the second extension 12, and the cover 33; and a second connecting hole 31 provided on the cover 33 and the sleeve 34.

[0026] Among them, the placement rack 7 is equipped with Each battery cell 8 has a voltage of 3.6V-3.7V. Multiple battery cells 8 are connected in series. The battery compartment 1 is fixed with a battery management system by screws, which monitors key parameters such as battery voltage, current, and temperature in real time. Since the battery management system and the mounting rack 7 are mature existing technologies and are not the inventive point of this application, no specific limitations are made on the structure of the battery management system and the mounting rack 7.

[0027] The thickened cover 41 is used to seal the opening at the top of the battery compartment 1. The thickness of the thickened cover 41 is significantly greater than the thickness of the first extension 43 to resist the influence of water pressure on the thickened cover 41 and reduce the deformation of the thickened cover 41 under water pressure. A large deformation of the thickened cover 41 would have a fatal impact on the sealing structure.

[0028] In this embodiment, the bottom end of the thickened cover 41 is also provided with a plurality of spaced reinforcing ribs 42. The reinforcing ribs 42 are integrally formed with the thickened cover 41. The reinforcing ribs 42 can enhance the strength of the thickened cover 41 and share the stress received by the thickened cover 41, reducing the deformation range of the thickened cover 41. In addition, the reinforcing ribs 42 also abut against the placement frame 7. The four sides of the placement frame 7 are also provided with corresponding abutment members 13. Combined with the reinforcing ribs 42 and the limiting of the bottom surface of the battery compartment 1 on the placement frame 7, the position of the placement frame 7 is fixed, preventing the placement frame 7 from shaking during the movement of the underwater robot.

[0029] The first extension 43 and the second extension 12 extend the sealing path between the thickened cover 41 and the opening of the battery compartment 1. A sealing element 9 is provided between the first extension 43 and the second extension 12, preferably a shaped sealing ring. Both the first extension 43 and the second extension 12 have grooves for positioning the sealing ring. By extending the sealing path, multiple sealing elements 9 can be provided between the first extension 43 and the second extension 12, so that high-pressure water theoretically needs to undergo multiple expansions, contractions, and sharp turns before it can enter the interior of the battery compartment 1, thereby improving the sealing performance of the battery compartment 1.

[0030] The cover 33 and sleeve 34 are the core structure of a sealed battery. They are assembled together via a second connecting hole 31 and screws, forming a rectangular sleeve. This rectangular sleeve is fitted over the outside of the first extension 43 and the second extension 12, thus placing the connecting seam between the first extension 43 and the second extension 12 inside the rectangular sleeve. A sealing element 9 is provided between the cover 33 and the sleeve 34, and also between the sleeve 34 and the second extension 12. These sealing elements 9 are preferably shaped sealing rings. The installation method of these sealing elements 9 is the same as that between the first extension 43 and the second extension 12, and will not be repeated here. The cover 33 and sleeve 34 further extend the sealing path, requiring high-pressure water to undergo more expansion, contraction, and sharp turns before theoretically entering the battery compartment 1, thereby improving the sealing performance of the battery compartment 1. Furthermore, since the first extension 43 and the second extension 12 are connected by screws and the first connecting hole 32, under water pressure, the thickened cover 41 is recessed into the battery compartment 1, and the first extension 43 is raised outward. Because the binding force on the first extension 43 between the two screws is relatively weak, the first extension 43 between the two screws may undergo significant deformation, thereby reducing the compression of the sealing ring. This allows the high-pressure seawater to deform the sealing ring, enabling seawater to flow into the battery compartment 1. The cover 33 and the sleeve 34 effectively strengthen the binding force on the first extension 43 between the two screws, reduce the deformation amplitude of the first extension 43, and even completely eliminate the deformation of the first extension 43.

[0031] Specifically, the thickened cap 41 resists water pressure and reduces its deformation, thus preventing seawater leakage caused by deformation of the cap 41. The first extension 43 and the second extension 12 extend the sealing path between the cap and the battery compartment 1, requiring high-pressure water to undergo multiple expansions, contractions, and sharp turns before theoretically entering the battery compartment 1, thereby improving the sealing performance of the battery compartment 1. The cover 33 and the sleeve 34 combine to form a rectangular sleeve, which is fitted over the outside of the first extension 43 and the second extension 12, further extending the sealing path. This requires high-pressure water to undergo even more expansions, contractions, and sharp turns before theoretically entering the battery compartment 1, further improving the sealing performance of the battery compartment 1. Furthermore, it strengthens the binding force on the first extension 43, reducing its deformation under high-pressure seawater, thus preventing seawater leakage caused by deformation of the first extension 43.

[0032] The battery compartment 1 is also provided with two first electrical connectors 5. Each of the two first electrical connectors 5 on the battery compartment 1 is provided with a limiting plate and a threaded section. The limiting plate on the first electrical connector 5 abuts against the outer wall of the battery compartment 1, and a locking nut 51 is screwed onto the first electrical connector 5. The locking nut 51 abuts against the inner wall of the battery compartment 1 to realize the connection between the first electrical connector 5 and the battery compartment 1. A sealing element 9 is provided between the first electrical connector 5 and the battery compartment 1. The sealing element 9 is preferably a sealing ring.

[0033] Among them, the battery compartment 1, the thickened cover 41, the first extension part 43, the second extension part 12, the cover 33, and the sleeve 34 are all made of 6061-T6 aluminum alloy. 6061-T6 aluminum alloy has a certain strength and its density is about 1 / 3 that of steel, which helps to reduce the overall weight. In addition, 6061-T6 aluminum alloy has excellent thermal conductivity, which helps to conduct the heat generated by the battery to the compartment wall and then carry it away by seawater.

[0034] See Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6As shown, in some embodiments, a sealing bladder 37 is also included, with the sealing bladder 37 disposed inside the sleeve 34. High-pressure seawater is injected into the sealing bladder 37, providing a strong outward expansion force. This allows the sealing bladder 37 to fully enter the gaps between the cover 33 and the sleeve 34, between the sleeve 34 and the second extension 12, and between the cover 33 and the first extension 43, effectively sealing these gaps and forming an effective seal. Furthermore, due to the high pressure inside the sealing bladder 37, it is difficult for the high-pressure seawater to deform, preventing it from entering the battery compartment 1. This improves the sealing performance of the battery compartment 1 and adapts it to harsh underwater operating environments.

[0035] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 10As shown, in some embodiments, it further includes: an injection hole 35, which is provided on the sleeve 34; a valve body 363, which is provided on the sleeve 34; the injection hole 35 communicates with the valve body 363; a sealing bladder 37 communicates with the valve body 363; the valve body 363 is bonded to the sleeve 34 with waterproof adhesive; both ends of the valve body 363 are provided with connection ports; the connection port at one end of the valve body 363 coincides with the injection hole 35; the connection port at the other end of the valve body 363 is connected to the sealing bladder 37; the sealing bladder 37 is provided with an injection port 371, which is bonded to the valve body 363; specifically, the sealing bladder 37 is made of one or more combinations of polyester fiber, nylon fiber, and aramid fiber; the outer part of the injection port 371 of the sealing bladder 37 is melted to bond to the connection port at the other end of the valve body 363, thereby forming a connection between the sealing bladder 37 and the injection port 371. 7. After the valve body 363 is installed, waterproof adhesive is filled between the injection port 371 and the sleeve 34 to prevent seawater from flowing in. The valve body 363 is provided with a stepped hole, which includes a large hole and a small hole. The valve body 363 can be formed by welding two sub-valve bodies 363. Valve block 364 is movably provided inside the valve body 363. Valve block 364 includes a plug head, an inflow section and a guide section. The guide section is provided with an inflow hole that extends to the inflow section. The inflow section is provided with a connecting through hole 362 that communicates with the inflow hole. The outer diameter of the plug head is equal to the inner diameter of the small hole. The outer diameter of the inflow section is greater than the inner diameter of the small hole but less than the inner diameter of the large hole. The outer diameter of the guide section is equal to the inner diameter of the large hole. A sealing element 9, which is a sealing ring, is provided between the plug section and the small hole. Elastic element 361 is provided between the valve block 364 and the valve body 363. The elastic element 361 is preferably a spring. The valve body 363, valve block 364, and elastic element 361 together form the compensation valve 36. When the underwater water pressure is greater than the pressure inside the sealing bladder 37, a pressure difference is created across the valve block 364. This causes the valve block 364 to move against the elastic force of the elastic element 361. When the pressure difference reaches a certain value, the sealing head disengages from the small hole, allowing high-pressure seawater to flow into the large hole and into the inlet hole through the connecting through-hole 362 on the inlet section, ultimately flowing into the sealing bladder 37. This increases the water pressure inside the sealing bladder 37, providing a greater outward expansion force to the sealing bladder 37, thus ensuring the battery compartment 1 maintains its sealing performance under high-pressure conditions, even under lower external water pressure. When the underwater robot emerges from the water, a drain needle can be inserted into the compensation valve 36, and the valve block 364 can be moved by external force, allowing the high-pressure seawater inside the sealing bladder 37 to flow out. This prevents the sealing bladder 37 from being constantly under high pressure, extending its service life.

[0036] See Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, in some embodiments, it further includes: a first arc-shaped portion 38, which is disposed within the sleeve 34; and a second arc-shaped portion, which is disposed at the bottom end of the cover 33. The first arc-shaped portion 38 and the second arc-shaped portion can further increase the sealing path without adding extra weight, making it more difficult for high-pressure seawater to enter the interior of the battery compartment 1, thereby improving the sealing performance of the battery compartment 1.

[0037] See Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, a pressure relief valve is also included, which is disposed in the sleeve 34 and connected to the sealing bladder 37. Since the sealing bladder 37 has a limit pressure, a pressure relief valve is provided to prevent the water pressure inside the sealing bladder 37 from exceeding the limit pressure. When the water pressure inside the sealing bladder 37 exceeds the set pressure, the pressure relief valve opens to release the high-pressure water inside the sealing bladder 37. The connection method of the pressure relief valve is the same as that of the compensation valve 36, and the pressure relief valve is a mature existing technology, which is not specifically limited here.

[0038] See Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7 As shown, in some embodiments, it further includes: a partition 6, which is disposed within the battery compartment 1, with a placement rack 7 located on one side of the partition 6; the partition 6 is used to separate the battery compartment 1, wherein the placement rack 7 and the battery cell 8 are located on one side of the partition 6, and the battery management system is located on the other side of the partition 6; a second electrical connector 62 is provided on the partition 6, and the connection method between the second electrical connector 62 and the partition 6 is the same as the connection method between the first electrical connector 5 and the battery compartment 1, which will not be repeated here. A rubber component 61 is provided at the top of the partition 6, and the rubber component 61 is bonded to the partition 6, abutting against the thickened cover 41. The separator 6 abuts against the thickened cover 41 through the rubber part 61 to provide support for the thickened cover 41 and prevent the thickened cover 41 from deforming significantly under water pressure. The separator 6 also divides the battery compartment 1 into two spaces to prevent the battery cells 8 and the placement rack 7 from affecting the installation of the battery management system and to provide a buffer for the battery cells 8 and the placement rack 7. When the first electrical connector 5 fails and seawater leaks, the separator 6 can continue to block the seawater and prevent the seawater from corroding the battery cells 8 and causing a safety accident.

[0039] See Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 9As shown, in some embodiments, the battery compartment 1 also includes a plurality of heat dissipation strips 11, with a plurality of heat dissipation strips 11 spaced apart at both ends. The heat dissipation strips 11 help to enhance the heat exchange efficiency between seawater and the side wall of the battery compartment 1. The front and rear ends of the heat dissipation strips 11 are provided with arc transition portions to reduce the increase in operating resistance caused by the heat dissipation strips 11.

[0040] In this embodiment, the thickness of the heat dissipation strip 11 gradually decreases along the direction away from the side wall of the battery compartment 1. At the end where the heat dissipation strip 11 connects to the side wall of the battery compartment 1, the cross-sectional area of ​​the heat dissipation strip 11 is increased, thereby increasing the connection area between the heat dissipation strip 11 and the side wall of the battery compartment 1. This facilitates the flow of heat to the heat dissipation strip 11 and into the seawater. At the end of the heat dissipation strip 11 away from the side wall of the battery compartment 1, the cross-sectional area of ​​the heat dissipation strip 11 is reduced, resulting in less operating resistance from the heat dissipation strip 11.

[0041] Preferably, the width direction of the heat dissipation strip 11 is parallel to the main operating direction of the underwater robot. More preferably, the inlet 371 faces the main operating direction of the underwater robot.

[0042] See Figure 1 , Figure 2 , Figure 6 , Figure 7 and Figure 9 As shown, in some embodiments, it further includes: a mounting bracket 2, which is provided at the bottom of the battery compartment 1, and the battery compartment 1 is mounted to the underwater robot via the mounting bracket 2. The mounting bracket 2 is L-shaped and includes two perpendicular mounting surfaces. One mounting surface has a third connecting hole 21, through which the mounting bracket 2 is mounted to the side of the battery compartment 1 by screws and the third connecting hole 21. The other mounting surface has a fourth mounting hole 22, through which the battery compartment 1 is connected to the underwater robot by screws and the fourth mounting hole 22. Mounting brackets 2 are provided on both sides of the battery compartment 1. Preferably, two mounting brackets 2 are provided on one side of the battery compartment 1. Both mounting surfaces of the mounting bracket 2 are parallel to the axis of the battery cell 8.

[0043] See Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, it further includes: a positioning member 121, wherein the bottom of the second extension 12 is provided with a positioning member 121, and the positioning member 121 is used to position the sleeve 34. Four positioning members 121 are provided at the bottom of the second extension 12, and the positioning members 121 are used to reduce the installation difficulty of the sleeve 34.

[0044] Example 2 In this embodiment, the parts that are the same as in Embodiment 1 are given the same reference numerals, and the same text descriptions are omitted.

[0045] This embodiment discloses an underwater robot that uses the sealed battery described in Embodiment 1.

[0046] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A sealed battery, comprising a battery compartment (1), wherein a placement rack (7) is disposed within the battery compartment (1), and a plurality of battery cells (8) are disposed on the placement rack (7), and one end of the battery compartment (1) is provided with an opening, characterized in that, Also includes: A thickened cover (41) is used to seal the opening of the battery compartment (1); The first extension (43) is provided with the thickened cover (41); The second extension (12) is provided near the opening of the battery compartment (1). Cover (33), said cover (33) is disposed at the top of the first extension (43); A sleeve (34) is provided on the outside of the second extension (12); The first connecting hole (32) is provided on the first extension (43), the second extension (12) and the cover (33). The second connecting hole (31) is provided on both the cover (33) and the sleeve (34).

2. A sealed battery according to claim 1, characterized in that, Also includes: A sealing bladder (37) is provided on the inner side of the sheath (34).

3. A sealed battery according to claim 2, characterized in that, Also includes: Injection hole (35), the injection hole (35) is provided on the sleeve (34); Valve body (363), the valve body (363) is provided on the sleeve (34), the injection hole (35) is connected to the valve body (363), and the sealing bladder (37) is connected to the valve body (363). Valve block (364), which is movably disposed within the valve body (363); An elastic element (361) is provided between the valve block (364) and the valve body (363).

4. A sealed battery according to claim 2, characterized in that, Also includes: The first arc-shaped portion (38) is provided inside the sleeve (34). The second arc-shaped portion is provided at the bottom end of the cover (33).

5. A sealed battery according to claim 2, characterized in that, Also includes: A pressure relief valve is provided on the sleeve (34) and is connected to the sealing bladder (37).

6. A sealed battery according to claim 1, characterized in that, Also includes: A partition (6) is disposed inside the battery compartment (1), and a placement rack (7) is located on one side of the partition (6); A rubber component (61) is provided at the top of the partition (6), and the rubber component (61) abuts against the thickened cover (41).

7. A sealed battery according to claim 1, characterized in that, Also includes: Several heat dissipation strips (11) are provided at intervals at both ends of the battery compartment (1).

8. A sealed battery according to claim 1, characterized in that, Also includes: The mounting bracket (2) is provided at the bottom of the battery compartment (1), and the battery compartment (1) is installed on the underwater robot through the mounting bracket (2).

9. A sealed battery according to claim 1, characterized in that, Also includes: Positioning element (121) is provided at the bottom of the second extension (12) and the positioning element (121) is used to position the sleeve (34).

10. An underwater robot, characterized in that, The underwater robot uses a sealed battery as described in any one of claims 1-9.

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