Lithium battery protection structure of underwater working robot and circuit thereof

Abstract

The invention relates to the technical field of lithium battery protection, in particular to a lithium battery protection structure of an underwater working robot and a circuit thereof.The lithium battery protection structure comprises a protection base and a protection top cover, an expansion airbag bin is formed in a brake groove, an expansion airbag is arranged in the expansion airbag bin, and the expansion airbag communicates with a brake airbag through a ventilation pipe; a battery box is arranged in the protective base, a circuit board is electrically connected to the battery box, a wire is electrically connected to the circuit board, a fixing block is arranged in the protective base, and the wire penetrates through the fixing block and extends to the outer side of the protective base. After the robot gradually goes deep into water, after a brake air bag is extruded, air in the brake air bag enters an expansion air bag, the expansion air bag extrudes a top cover sliding block, the waterproof performance is improved, and after water enters a protection base, two gold immersion bonding pads arranged on a water inlet bonding pad in a staggered mode can be short-circuited, so that the robot is prevented from being damaged. Therefore, the protection performance of the lithium battery is further improved.

Description

Technical Field

[0001] The present invention relates to a lithium battery protection structure and a circuit thereof, in particular to a lithium battery protection structure and a circuit thereof for an underwater working robot, belonging to the technical field of lithium battery protection. Background Art

[0002] A lithium battery is a battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. It can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium metal batteries generally use manganese dioxide as the positive electrode material, metallic lithium or its alloy metal as the negative electrode material, and a non-aqueous electrolyte solution; while lithium ion batteries generally use lithium alloy metal oxides as the positive electrode material, graphite as the negative electrode material, and a non-aqueous electrolyte.

[0003] When a lithium battery short-circuits, the rate of chemical reactions inside the battery increases dramatically, generating a large amount of heat and rapidly raising the temperature. If this heat cannot be effectively dissipated, the battery temperature will continue to rise, causing internal pressure to increase. Eventually, the battery may rupture or explode. Especially when a lithium battery on an underwater robot short-circuits, it will not only affect the normal operation, but also cause huge damage. Especially as the pressure increases, the protection of the lithium battery is particularly important.

[0004] Therefore, there is an urgent need to improve the lithium battery protection structure and its circuit to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to provide a lithium battery protection structure and circuit of an underwater working robot. After the robot gradually goes deeper into the water, the pressure gradually increases with the increase of depth. After the brake airbag is squeezed, the internal gas enters the interior of the expansion airbag. The expansion airbag squeezes the top cover slider to improve the waterproof performance. After water enters the interior of the protection base, the two staggered immersion gold pads on the water inlet pad will short-circuit and cause the fuse to open, further improving the protection performance of the lithium battery.

[0006] In order to achieve the above object, the main technical solutions adopted by the present invention include: A lithium battery protection structure for an underwater working robot, comprising a protection base and a protection top cover clamped on the protection base, wherein the protection base is provided with a connected extrusion airbag bin and a brake groove, the bottom of the protection top cover is connected with a top cover slider, the bottom of the top cover slider is connected with a brake block, the top cover slider is slidably arranged in the brake groove, the brake block is slidably arranged in the extrusion airbag bin, a brake airbag is fixedly arranged in the extrusion airbag bin, an expansion airbag bin is provided in the brake groove, an expansion airbag is fixedly arranged in the expansion airbag bin, and the expansion airbag is connected with the brake airbag through a ventilating pipe; A battery box is fixedly arranged inside the protective base, a circuit board is electrically connected to the battery box, a wire is electrically connected to the circuit board, a fixing block is fixedly arranged inside the protective base, and the wire passes through the fixing block and extends to the outside of the protective base.

[0007] Preferably, a cylindrical airbag is fixedly arranged inside the fixing block, the outer side surface of the cylindrical airbag is fixedly connected to the fixing block, the cylindrical airbag is connected to the brake airbag through a cylindrical airbag connecting tube, and the wire passes through the cylindrical airbag.

[0008] Preferably, a heat dissipation fixing plate is fixedly provided on the bottom side surface of the protective base, a plurality of heat dissipation support columns are fixedly provided on the heat dissipation fixing plate, the heat dissipation support columns penetrate the protective base and are arranged inside the protective base, heat dissipation holes are opened at the connection between the heat dissipation support columns and the heat dissipation fixing plate, a semiconductor refrigeration coil is fixedly provided on the outer side surface of the heat dissipation support columns, and the heat dissipation surface of the semiconductor refrigeration coil is fixedly connected to the heat dissipation support columns.

[0009] Preferably, a sealing plate groove is provided on the protective top cover, a sealing plate is slidably provided inside the sealing plate groove, and the sealing plate is slidably engaged with the sealing plate groove through a sealing plate clamping block; The sealing plate clamping block is provided with a sealing gasket which abuts against the sealing plate groove.

[0010] Preferably, the circuit board is fixedly arranged inside the protective base through a circuit board support column, a base clamp is fixedly arranged on the bottom side of the protective base, and a plurality of assembly holes are opened on the base clamp.

[0011] A lithium battery protection circuit for an underwater working robot, comprising a protection circuit, the protection circuit being coupled to the circuit board, the protection circuit comprising an electrically connected chip U1 and a chip U2, a CO pin of the chip U1 being connected to a water inlet detection pad via a feedback circuit, the feedback circuit comprising a transistor Q1 and a transistor Q3 being arranged in series; A fuse is electrically connected to the VDD pin of the chip U1 , one end of the water inlet detection pad is electrically connected to pin 1 of the fuse, and the other end of the water inlet detection pad is electrically connected to the transistor Q3 .

[0012] Preferably, the transistor Q1 and the transistor Q3 are connected in series and then connected in parallel with the water inlet detection pad, and the water inlet detection pad is electrically connected to the pin 1 of the transistor Q3 via a resistor R22; A resistor R7, a capacitor C3 and a diode DZ1 are connected in parallel to the pins 1 and 2 of the transistor Q3; Pin 3 of the transistor Q3 is electrically connected to pin 3 of the transistor Q1 , pin 1 of the transistor Q1 is electrically connected to the chip U1 via resistor R7 , and capacitor C8 and resistor R9 are connected in parallel to pin 1 and pin 2 of the transistor Q1 .

[0013] Preferably, the pin 3 of the transistor Q3 is electrically connected to the pin 2 of the fuse; The water inlet detection pad includes two immersion gold pads, which are arranged in a staggered and embedded manner.

[0014] Preferably, the chip U2 is electrically connected to a positive connection line P+ and a negative connection line P-, a resistor R16, a diode D1 and a rectifier diode VD1 are arranged in series on one side of the positive connection line P+ and the negative connection line P-, and capacitors C16 and C19 are arranged in parallel on the resistor R16, the diode D1 and the rectifier diode VD1.

[0015] Preferably, pin VC1 of the chip U2 is electrically connected to battery Cell1, pin VC2 of the chip U2 is electrically connected to battery Cell2, pin VC3 of the chip U2 is electrically connected to battery Cell3, pin VC4 of the chip U2 is electrically connected to battery Cell4, pin VC5 of the chip U2 is electrically connected to battery Cell5, pin VC6 of the chip U2 is electrically connected to battery Cell6, and battery Cell1, battery Cell2, battery Cell3, battery Cell4, battery Cell5 and battery Cell6 are all fixedly arranged inside the battery box.

[0016] The present invention has at least the following beneficial effects: 1. The protective top cover at the bottom of the protective top cover is slidingly arranged inside the brake groove. After the robot gradually goes deeper into the water, the pressure gradually increases with the increase of depth, and the protective top cover is squeezed. After the protective top cover is squeezed, the top cover slider on the protective top cover slides inside the brake groove and squeezes the brake airbag inside the squeezing airbag compartment through the brake block. After the brake airbag is squeezed, the internal gas enters the expansion airbag through the vent pipe, causing the expansion airbag to expand. The expansion airbag squeezes the top cover slider, which can increase the resistance between the expansion airbag and the top cover slider, prevent the top cover slider from sliding quickly, improve the waterproof performance, and help protect the electrical components inside the protective base. On the other hand, the brake airbag can play a certain buffering role on the protective top cover, prevent excessive pressure from damaging the protective base or the protective top cover, and reduce the service life of the protective base or the protective top cover.

[0017] 2. First of all, the fixing block can play a certain role in fixing the wire and improving the stability of the wire. In addition, a cylindrical airbag is fixed inside the fixing block. The wire runs through the inside of the cylindrical airbag, and the cylindrical airbag is wrapped around the outer side of the wire. Therefore, it can improve the stability of the wire and play a certain waterproof role. Moreover, the cylindrical airbag is connected to the brake airbag through the cylindrical airbag connecting tube. After the brake airbag is squeezed, the cylindrical airbag will expand and wrap the wire in all directions. As the pressure increases, the pressure of the cylindrical airbag on the wire increases. That is to say, as the depth of the robot increases, the pressure between the cylindrical airbag and the wire will increase, and the waterproof performance will be greatly improved.

[0018] 3. A heat dissipation fixing plate is fixed at the bottom of the protective base. A number of heat dissipation support columns are arranged on the heat dissipation fixing plate and extend through the protective base to the inside of the protective base. The semiconductor refrigeration coil on the heat dissipation support column absorbs the heat inside the protective base and then transfers it to the inside of the heat dissipation hole through the heat dissipation support column. After the device is put into water, water will enter the inside of the protective base, thereby facilitating the heat dissipation of the inside of the protective base and greatly improving the cooling efficiency.

[0019] 4. A water inlet pad is connected to the protection circuit through a feedback circuit to detect the water inlet pad. The water inlet pad includes two immersion gold pads, which are arranged in a staggered manner. After water enters the interior of the protection base, water droplets will adhere to the water inlet pad, and the two staggered immersion gold pads on the water inlet pad will short-circuit. After the short-circuit occurs, the water inlet pad pushes the information to the feedback circuit and causes the fuse to open. After the fuse opens, the power supply inside the battery box stops supplying power, thereby improving the protection performance of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings: Figure 1 It is a cross-sectional view of the protective base of the present invention; Figure 2 is a cross-sectional view of a fixing block of the present invention; Figure 3 The local structure of the present invention Figure 1 ; Figure 4 The local structure of the present invention Figure 2 ; Figure 5 is a protection circuit diagram of the present invention; Figure 6 This is a circuit board effect diagram of the present invention; Figure 7 The three-dimensional Figure 1 ; Figure 8 The three-dimensional Figure 2 .

[0021] In the figure, 1. protective base; 101. extrusion airbag compartment; 102. expansion airbag compartment; 103. brake groove; 104. ventilation pipe; 2. protective top cover; 201. top cover slider; 202. brake block; 203. sealing plate groove; 3. brake airbag; 301. cylindrical airbag connecting pipe; 4. expansion airbag; 5. sealing plate; 501. sealing plate block; 6. fixing block; 601. cylindrical airbag; 7. heat dissipation fixing plate; 701. heat dissipation support column; 703. heat dissipation hole; 704. semiconductor refrigeration coil; 8. circuit board; 801. circuit board support column; 9. wire; 10. battery box; 11. base clamp; 12. assembly hole; 13. protection circuit; 14. feedback circuit; 15. water inlet detection pad; 16. fuse. DETAILED DESCRIPTION

[0022] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly. Example

[0023] like Figure 1-Figure 8As shown, the lithium battery protection structure of the underwater working robot provided in this embodiment includes a protection base 1 and a protection top cover 2 clamped on the protection base 1. By directly clamping the protection top cover 2 on the protection base 1, the structure is simple, the protection top cover 2 can slide relative to the protection base 1, and play a certain buffering role. When the pressure is large, the protection top cover 2 gradually approaches the protection base 1. The protection base 1 is provided with a connected extrusion airbag bin 101 and a brake groove 103. The bottom of the protection top cover 2 is connected to a top cover slider 201, and the bottom of the top cover slider 201 is connected to a brake block 202. The top cover slider 201 is slidably arranged in the brake groove 103, and the brake block 202 is slidably arranged in the extrusion airbag bin 101. The brake airbag 3 is fixedly arranged in the extrusion airbag bin 101, and the brake groove 103 is provided with an expansion airbag bin 102. The expansion airbag 4 is fixedly arranged in the expansion airbag bin 102. The expansion airbag 4 is connected to the brake airbag 3 through the vent 104. The top cover slider 201 is slidably arranged inside the brake groove 103. After the robot gradually goes deeper into the water, the pressure gradually increases with the increase of depth, and the protective top cover 2 is squeezed. After the protective top cover 2 is squeezed, the top cover slider 201 on the protective top cover 2 slides inside the brake groove 103 and squeezes the brake airbag 3 inside the squeezing airbag warehouse 101 through the brake block 202. After the brake airbag 3 is squeezed, the internal gas enters the expansion airbag 4 through the vent pipe 104, so that the expansion airbag 4 expands. The expansion airbag 4 squeezes the top cover slider 201. On the one hand, it can increase the resistance between the expansion airbag 4 and the top cover slider 201, prevent the top cover slider 201 from sliding quickly, improve the waterproof performance, and help protect the electrical components inside the protective base 1. On the other hand, the brake airbag 3 can play a certain buffering role on the protective top cover 2, prevent excessive pressure from damaging the protective base 1 or the protective top cover 2, and reduce the service life of the protective base 1 or the protective top cover 2; In addition, since the wire 9 needs to pass through the protective base 1, it is necessary to ensure the waterproof performance of the wire 9. A battery box 10 is fixedly arranged inside the protective base 1. The battery box 10 is electrically connected to the circuit board 8. The circuit board 8 is electrically connected to the wire 9. A fixing block 6 is fixedly arranged inside the protective base 1. The wire 9 passes through the fixing block 6 and extends to the outside of the protective base 1. The wire 9 electrically connected to the circuit board 8 needs to pass through the protective base 1. Therefore, a waterproof sealing device needs to be provided at the connection between the wire 9 and the protective base 1. A cylindrical fixing block 6 is fixedly arranged inside the fixing block 6. The airbag 601, the outer side of the cylindrical airbag 601 is fixedly connected to the fixing block 6, the cylindrical airbag 601 is connected to the brake airbag 3 through the cylindrical airbag connecting tube 301, the wire 9 runs through the cylindrical airbag 601, firstly, the fixing block 6 can play a certain fixing role on the wire 9, and improve the stability of the wire 9. In addition, the cylindrical airbag 601 is fixedly arranged inside the fixing block 6, and the wire 9 runs through the inside of the cylindrical airbag 601. The cylindrical airbag 601 is wrapped around the outer side of the wire 9, so that the stability of the wire 9 can be improved, and a certain waterproof effect can be played; Moreover, the cylindrical airbag 601 is connected to the brake airbag 3 through the cylindrical airbag connecting tube 301. After the brake airbag 3 is squeezed, the cylindrical airbag 601 will expand and wrap the wire 9 in all directions. As the pressure increases, the pressure of the cylindrical airbag 601 on the wire 9 increases. That is to say, as the depth of the robot increases, the pressure between the cylindrical airbag 601 and the wire 9 will increase, and the waterproof performance will be greatly improved. In addition, when the pressure on the brake airbag 3 decreases, the pressure on the cylindrical airbag 601 decreases. In other words, when the robot is taken out of the water, the pressure on the brake airbag 3 decreases, and the pressure between the cylindrical airbag 601 and the wire 9 also decreases. The heat inside the protective base 1 can be completely dissipated through the gap between the cylindrical airbag 601 and the wire 9, which is convenient for heat dissipation inside the protective base 1. In order to further improve the waterproof performance of the device, a heat dissipation fixing plate 7 is fixedly provided on the bottom side of the protective base 1, and a plurality of heat dissipation support columns 701 are fixedly provided on the heat dissipation fixing plate 7. The heat dissipation support column 701 penetrates the protective base 1 and is arranged inside the protective base 1. A heat dissipation hole 703 is provided at the connection between the heat dissipation support column 701 and the heat dissipation fixing plate 7. A semiconductor refrigeration coil 704 is fixedly provided on the outer side of the heat dissipation support column 701. The heat dissipation surface of the semiconductor refrigeration coil 704 is fixedly connected to the heat dissipation support column 701. A heat dissipation fixing plate 7 is fixed at the bottom of the protective base 1. A plurality of heat dissipation support columns 701 are arranged on the heat dissipation fixing plate 7 and penetrate the protective base 1 and extend to the inside of the protective base 1. The semiconductor refrigeration coil 704 on the heat dissipation support column 701 absorbs the heat inside the protective base 1 and then transmits it to the inside of the heat dissipation hole 703 through the heat dissipation support column 701. After the device is put into water, water will enter the inside of the protective base 1, thereby facilitating the heat dissipation of the inside of the protective base 1, thereby greatly improving the cooling efficiency. In addition, a sealing plate groove 203 is opened on the protective top cover 2, and a sealing plate 5 is slidably arranged inside the sealing plate groove 203. The sealing plate 5 is slidably engaged with the sealing plate groove 203 through a sealing plate clamping block 501. A sealing gasket that abuts against the sealing plate groove 203 is arranged on the sealing plate clamping block 501. The sealing plate 5 is slidably arranged on the protective top cover 2. The sliding sealing plate 5 facilitates the inspection of components inside the protective base 1, and at the same time, the protective base 1 and the protective top cover 2 can be conveniently sealed. The structure is simple, and the convenience of use is improved.

[0024] Further, such as Figure 1 and Figure 7 As shown, the circuit board 8 is fixedly arranged inside the protective base 1 by means of the circuit board support column 801, a base clamp 11 is fixedly arranged on the bottom side of the protective base 1, and a plurality of assembly holes 12 are opened on the base clamp 11. The circuit board 8 is fixedly arranged inside the protective base 1 by means of the circuit board support column 801, so that the stability of the circuit board 8 is improved, and the protective base 1 is conveniently installed through the base clamp 11 and the assembly holes 12 on the protective base 1, thereby improving the convenience of use. Example

[0025] The lithium battery protection circuit of the underwater working robot provided in this embodiment is as follows: Figure 5As shown, the protection circuit 13 includes a protection circuit 13, which is coupled to the circuit board 8. The protection circuit 13 includes a chip U1 and a chip U2 that are electrically connected. The CO pin of the chip U1 is connected to a water inlet detection pad 15 through a feedback circuit 14. The feedback circuit 14 includes a transistor Q1 and a transistor Q3 that are arranged in series. A fuse 16 is electrically connected to the VDD pin of the chip U1. One end of the water inlet detection pad 15 is electrically connected to a pin 1 of the fuse 16, and the other end of the water inlet detection pad 15 is electrically connected to the transistor Q3. The pin 3 of the transistor Q3 is electrically connected to the pin 2 of the fuse 16. A water inlet detection pad 15 is connected to the protection circuit 13 through a feedback circuit 14. The water inlet detection pad 15 includes two immersion gold pads, which are arranged in a staggered manner. After water enters the interior of the protection base 1, water droplets will adhere to the water inlet detection pad 15, and the two staggered immersion gold pads on the water inlet detection pad 15 will short-circuit. After the short-circuit occurs, the water inlet detection pad 15 pushes information to the feedback circuit 14 and triggers the fuse 16 to open. After the fuse 16 opens, the power supply inside the battery box 10 stops supplying power, thereby improving the protection performance of the lithium battery.

[0026] Further, such as Figure 5 As shown, transistor Q1 and transistor Q3 are connected in series and then connected in parallel with the water inlet detection pad 15. The water inlet detection pad 15 is electrically connected to pin 1 of transistor Q3 through resistor R22. Resistor R7, capacitor C3 and diode DZ1 are connected in parallel to pin 1 and pin 2 of transistor Q3. Pin 3 of transistor Q3 is electrically connected to pin 3 of transistor Q1, pin 1 of transistor Q1 is electrically connected to chip U1 through resistor R7, capacitor C8 and resistor R9 are arranged in parallel on pin 1 and pin 2 of transistor Q1, pin 3 of transistor Q3 and transistor Q1 are used for detection, rectification, amplification, switching, voltage stabilization and other functions. In the common emitter circuit, a small change in base current can control a larger change in collector current, thereby realizing signal amplification and improving circuit stability.

[0027] Furthermore, the chip U2 is electrically connected with a positive connection line P+ and a negative connection line P-, and a resistor R16, a diode D1 and a rectifier diode VD1 are arranged in series on one side of the positive connection line P+ and the negative connection line P-. Capacitors C16 and C19 are arranged in parallel on the resistor R16, the diode D1 and the rectifier diode VD1. The series resistor R16 can limit the current to prevent other components in the circuit from being damaged due to excessive current, thereby protecting the stable operation of the circuit. The diode D1 is connected in series with a current limiting resistor in the voltage stabilizing circuit by utilizing the unidirectional conductivity of the diode, so that the current does not exceed the allowable value after the voltage stabilizing tube is broken down, thereby providing a stable output voltage and also playing a protective role. The rectifier diode VD1 only allows current to be conducted in one direction and blocks current in the other direction, thereby providing a stable DC power supply for the electronic device. The series resistor R16, the diode D1 and the rectifier diode VD1 each have a unique role and function in the electronic circuit, and together realize the efficient and stable operation of the circuit; Pin VC1 of chip U2 is electrically connected to battery Cell1, pin VC2 of chip U2 is electrically connected to battery Cell2, pin VC3 of chip U2 is electrically connected to battery Cell3, pin VC4 of chip U2 is electrically connected to battery Cell4, pin VC5 of chip U2 is electrically connected to battery Cell5, pin VC6 of chip U2 is electrically connected to battery Cell6, battery Cell1, battery Cell2, battery Cell3, battery Cell4, battery Cell5 and battery Cell6 are all fixedly arranged inside the battery box 10, and multiple batteries are electrically connected to the pins of chip U2 to ensure the stability of circuit power supply. At the same time, the structure is simple and the production cost is low.

[0028] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0029] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0030] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A lithium battery protection structure for an underwater working robot, comprising a protection base (1) and a protection top cover (2) clamped on the protection base (1), characterized in that: The protection base (1) is provided with an extrusion airbag compartment (101) and a brake groove (103) which are connected to each other; the bottom of the protection top cover (2) is connected with a top cover slider (201); the bottom of the top cover slider (201) is connected with a brake block (202); the top cover slider (201) is slidably arranged inside the brake groove (103); the brake block (202) is slidably arranged inside the extrusion airbag compartment (101); a brake airbag (3) is fixedly arranged inside the extrusion airbag compartment (101); an expansion airbag compartment (102) is provided inside the brake groove (103); an expansion airbag (4) is fixedly arranged inside the expansion airbag compartment (102); the expansion airbag (4) is connected to the brake airbag (3) via a vent pipe (104); A battery box (10) is fixedly arranged inside the protective base (1), a circuit board (8) is electrically connected to the battery box (10), a wire (9) is electrically connected to the circuit board (8), a fixing block (6) is fixedly arranged inside the protective base (1), and the wire (9) passes through the fixing block (6) and extends to the outside of the protective base (1).

2. The lithium battery protection structure of an underwater working robot according to claim 1, characterized in that: A cylindrical airbag (601) is fixedly arranged inside the fixing block (6), the outer side surface of the cylindrical airbag (601) is fixedly connected to the fixing block (6), the cylindrical airbag (601) is connected to the brake airbag (3) via a cylindrical airbag connecting tube (301), and the wire (9) passes through the cylindrical airbag (601).

3. The lithium battery protection structure of an underwater working robot according to claim 1, characterized in that: A heat dissipation fixing plate (7) is fixedly arranged on the bottom side of the protection base (1), and a plurality of heat dissipation support columns (701) are fixedly arranged on the heat dissipation fixing plate (7). The heat dissipation support columns (701) penetrate the protection base (1) and are arranged inside the protection base (1). Heat dissipation holes (703) are provided at the connection between the heat dissipation support columns (701) and the heat dissipation fixing plate (7). A semiconductor refrigeration coil (704) is fixedly arranged on the outer side of the heat dissipation support column (701), and the heat dissipation surface of the semiconductor refrigeration coil (704) is fixedly connected to the heat dissipation support column (701).

4. The lithium battery protection structure of an underwater working robot according to claim 1, characterized in that: The protective top cover (2) is provided with a sealing plate groove (203), a sealing plate (5) is slidably arranged inside the sealing plate groove (203), and the sealing plate (5) is slidably engaged with the sealing plate groove (203) via a sealing plate clamping block (501); The sealing plate clamping block (501) is provided with a sealing gasket which abuts against the sealing plate groove (203).

5. The lithium battery protection structure of an underwater working robot according to claim 1, characterized in that: The circuit board (8) is fixedly arranged inside the protective base (1) via a circuit board support column (801); a base clamp (11) is fixedly arranged on the bottom side of the protective base (1); and a plurality of assembly holes (12) are provided on the base clamp (11).

6. A lithium battery protection circuit for an underwater working robot, comprising the lithium battery protection structure for an underwater working robot according to claim 1, characterized in that: The invention comprises a protection circuit (13), the protection circuit (13) being coupled to the circuit board (8), the protection circuit (13) comprising a chip U1 and a chip U2 which are electrically connected, the CO pin of the chip U1 being connected to a water ingress detection pad (15) via a feedback circuit (14), the feedback circuit (14) comprising a transistor Q1 and a transistor Q3 which are arranged in series; A fuse (16) is electrically connected to the VDD pin of the chip U1, one end of the water inlet detection pad (15) is electrically connected to pin 1 of the fuse (16), and the other end of the water inlet detection pad (15) is electrically connected to the transistor Q3.

7. A lithium battery protection circuit for an underwater working robot according to claim 6, characterized in that: The transistor Q1 and the transistor Q3 are connected in series and then connected in parallel to the water inlet detection pad (15); the water inlet detection pad (15) is electrically connected to the pin 1 of the transistor Q3 via a resistor R22; A resistor R7, a capacitor C3 and a diode DZ1 are connected in parallel to the pins 1 and 2 of the transistor Q3; Pin 3 of the transistor Q3 is electrically connected to pin 3 of the transistor Q1 , pin 1 of the transistor Q1 is electrically connected to the chip U1 via resistor R7 , and capacitor C8 and resistor R9 are connected in parallel to pin 1 and pin 2 of the transistor Q1 .

8. The lithium battery protection circuit of an underwater working robot according to claim 6, characterized in that: Pin 3 of the transistor Q3 is electrically connected to pin 2 of the fuse (16); The water inlet detection pad (15) comprises two immersion gold pads, which are arranged in a staggered and embedded manner.

9. The lithium battery protection circuit of an underwater working robot according to claim 6, characterized in that: The chip U2 is electrically connected to a positive connection line P+ and a negative connection line P-, and a resistor R16, a diode D1 and a rectifier diode VD1 are arranged in series on one side of the positive connection line P+ and the negative connection line P-, and capacitors C16 and C19 are arranged in parallel on the resistor R16, the diode D1 and the rectifier diode VD1.

10. The lithium battery protection circuit of an underwater working robot according to claim 6, characterized in that: Pin VC1 of the chip U2 is electrically connected to battery Cell1, pin VC2 of the chip U2 is electrically connected to battery Cell2, pin VC3 of the chip U2 is electrically connected to battery Cell3, pin VC4 of the chip U2 is electrically connected to battery Cell4, pin VC5 of the chip U2 is electrically connected to battery Cell5, pin VC6 of the chip U2 is electrically connected to battery Cell6, and battery Cell1, battery Cell2, battery Cell3, battery Cell4, battery Cell5 and battery Cell6 are all fixedly arranged inside the battery box (10).

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