Lithium battery protection structure and circuit of an underwater working robot

Abstract

The present invention relates to the technical field of lithium battery protection, and specifically to a lithium battery protection structure and its circuit for an underwater working robot, including a protection base and a protection top cover. An expansion airbag chamber is provided inside the braking groove, and an expansion airbag is arranged inside the expansion airbag chamber. The expansion airbag is communicated with the braking airbag through an air pipe; a battery box is arranged inside the protection 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 inside the protection base, and the wire passes through the fixing block and extends to the outside of the protection base. After the robot gradually enters the water, the gas inside the braking airbag is squeezed into the expansion airbag after being squeezed, and the expansion airbag squeezes the top cover slider to improve the waterproof performance. After water enters the protection base, the two misaligned immersion gold pads on the water inlet pad will be short-circuited, and the fuse will be opened, further improving the protection performance of the lithium battery.

Description

Technical Field

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

[0002] A lithium battery is a battery with a 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 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 chemical reaction rate inside the battery will increase sharply, generating a large amount of heat and rapidly rising the temperature. If this heat cannot be effectively dissipated, the battery temperature will continue to rise, resulting in an increase in internal pressure. Eventually, the battery may rupture or explode. Especially when the lithium battery on an underwater robot short-circuits, it not only affects the normal operation of the work but also causes great damage. Especially with the increase in pressure, the protection of the lithium battery is particularly important.

[0004] Therefore, it is urgent to improve the lithium battery protection structure and its circuit to solve the above existing problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a lithium battery protection structure and its circuit for an underwater working robot. After the robot gradually penetrates into the water, as the depth increases, the pressure gradually increases. The gas inside the braking airbag enters the inside of the expansion airbag after being squeezed, and the expansion airbag squeezes the top cover slider to improve the waterproof performance. After water enters the inside of the protection base, the two misaligned immersion gold pads on the water inlet pad will short-circuit and cause the fuse to blow, further improving the protection performance of the lithium battery.

[0006] To achieve the above purpose, the main technical solutions adopted by the present invention include:

[0007] A lithium battery protection structure for an underwater working robot, comprising a protection base and a protection top cover clamped on the protection base. An extrusion airbag chamber and a braking groove are communicated with each other inside the protection base. A top cover slider is connected to the bottom of the protection top cover, and a braking block is connected to the bottom of the top cover slider. The top cover slider is slidably arranged inside the braking groove, and the braking block is slidably arranged inside the extrusion airbag chamber. A braking airbag is fixedly arranged inside the extrusion airbag chamber, and an expansion airbag chamber is arranged inside the braking groove. An expansion airbag is fixedly arranged inside the expansion airbag chamber, and the expansion airbag is communicated with the braking airbag through an air pipe;

[0008] A battery box is fixedly arranged inside the protection base. A circuit board is electrically connected to the battery box, and a wire is electrically connected to the circuit board. A fixing block is fixedly arranged inside the protection base, and the wire penetrates through the fixing block and extends to the outside of the protection base.

[0009] 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 communicated with the braking airbag through a cylindrical airbag connecting pipe, and the wire penetrates through the cylindrical airbag.

[0010] Preferably, a heat dissipation fixing plate is fixedly arranged on the bottom side surface of the protection base. A plurality of heat dissipation support columns are fixedly arranged on the heat dissipation fixing plate. The heat dissipation support columns penetrate through the protection base and are arranged inside the protection base. Heat dissipation holes are arranged at the connection part of the heat dissipation support columns and the heat dissipation fixing plate. A semiconductor refrigeration ring is fixedly arranged on the outer side surface of the heat dissipation support column, and the heat dissipation surface of the semiconductor refrigeration ring is fixedly connected to the heat dissipation support column.

[0011] Preferably, a sealing plate groove is arranged on the protection top cover. A sealing plate is slidably arranged inside the sealing plate groove. The sealing plate is slidably clamped and connected to the sealing plate groove through a sealing plate clamping block;

[0012] A sealing pad that abuts against the sealing plate groove is arranged on the sealing plate clamping block.

[0013] Preferably, the circuit board is fixedly arranged inside the protection base through circuit board support columns. A base clamping part is fixedly arranged on the bottom side surface of the protection base, and a plurality of assembly holes are arranged on the base clamping part.

[0014] A lithium battery protection circuit for an underwater working robot, comprising a protection circuit. The protection circuit is coupled to the circuit board. The protection circuit includes a chip U1 and a chip U2 that are electrically connected. The CO pin of the chip U1 is connected to a detection water ingress pad through a feedback circuit. The feedback circuit includes a transistor Q1 and a transistor Q3 connected in series;

[0015] A fuse is electrically connected to the VDD pin of the chip U1. One end of the detected water inlet pad is electrically connected to the pin 1 of the fuse, and the other end of the detected water inlet pad is electrically connected to the transistor Q3.

[0016] Preferably, the transistor Q1 and the transistor Q3 are connected in series and then connected in parallel with the detected water inlet pad. The detected water inlet pad is electrically connected to the pin 1 of the transistor Q3 through the resistor R22.

[0017] A resistor R7, a capacitor C3 and a diode DZ1 are connected in parallel on the pin 1 and pin 2 of the transistor Q3.

[0018] The pin 3 of the transistor Q3 is electrically connected to the pin 3 of the transistor Q1. The pin 1 of the transistor Q1 is electrically connected to the chip U1 through the resistor R7. A capacitor C8 and a resistor R9 are connected in parallel on the pin 1 and pin 2 of the transistor Q1.

[0019] Preferably, the pin 3 of the transistor Q3 is electrically connected to the pin 2 of the fuse.

[0020] The detected water inlet pad includes two immersion gold pads and is arranged in a staggered and nested manner.

[0021] Preferably, a positive connection line P+ and a negative connection line P- are electrically connected to the chip U2. A resistor R16, a diode D1 and a rectifier diode VD1 are connected in series on one side of the positive connection line P+ and the negative connection line P-. A capacitor C16 and a capacitor C19 are connected in parallel on the resistor R16, the diode D1 and the rectifier diode VD1.

[0022] Preferably, a battery Cell1 is electrically connected to the pin VC1 of the chip U2, a battery Cell2 is electrically connected to the pin VC2 of the chip U2, a battery Cell3 is electrically connected to the pin VC3 of the chip U2, a battery Cell4 is electrically connected to the pin VC4 of the chip U2, a battery Cell5 is electrically connected to the pin VC5 of the chip U2, and a battery Cell6 is electrically connected to the pin VC6 of the chip U2. The battery Cell1, the battery Cell2, the battery Cell3, the battery Cell4, the battery Cell5 and the battery Cell6 are all fixedly arranged inside the battery box.

[0023] The present invention has at least the following beneficial effects:

[0024] 1. The protective top cover at the bottom of the protective top cover is slidably arranged inside the braking groove. After the robot gradually dives into the water, as the depth increases, the pressure gradually increases and squeezes the protective top cover. After the protective top cover is squeezed, the top cover slider on the protective top cover slides inside the braking groove and squeezes the braking airbag inside the extrusion airbag chamber through the braking block. After the braking airbag is squeezed, the gas inside enters the expansion airbag through the air pipe, causing the expansion airbag to expand. The expansion airbag squeezes the top cover slider. On the one hand, it 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 is beneficial to protecting the electrical components inside the protective base. On the other hand, the braking airbag can play a certain buffering role for 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.

[0025] 2. First, the fixing block can play a certain role in fixing the wire and improve the stability of the wire. In addition, a cylindrical airbag is fixedly arranged inside the fixing block, and the wire passes through the inside of the cylindrical airbag, and the cylindrical airbag wraps around the outer side of the wire. Therefore, it can not only improve the stability of the wire but also play a certain waterproof role. Moreover, the cylindrical airbag is connected to the braking airbag through the cylindrical airbag connecting pipe. After the braking 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 becomes greater. 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.

[0026] 3. A heat dissipation fixing plate is fixed at the bottom of the protective base. There are several heat dissipation support columns on the heat dissipation fixing plate and they penetrate the protective base and extend into the inside of the protective base. The semiconductor refrigeration ring on the heat dissipation support column absorbs the heat inside the protective base and then transfers it to the inside of the heat dissipation holes through the heat dissipation support columns. After the device is put into the water, the water will enter the inside of the protective base, which is convenient for dissipating the heat inside the protective base and greatly improves the cooling efficiency.

[0027] 4. An inlet solder pad is connected to the protection circuit through a feedback circuit. The detection inlet solder pad includes two immersion gold solder pads and is arranged in a misaligned and nested manner. After the water enters the inside of the protective base, the water droplets will adhere to the inlet solder pad, and the two misaligned immersion gold solder pads on the inlet solder pad will be short-circuited. After the short circuit, the inlet solder pad will push the information to the feedback circuit and cause the fuse to break. After the fuse breaks, the power supply inside the battery box will stop supplying power, improving the protection performance of the lithium battery. Description of the Drawings

[0028] The accompanying 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 of the present application. In the drawings:

[0029] Figure 1 is a cross-sectional view of the protective base of the present invention;

[0030] Figure 2 is a cross-sectional view of the fixing block of the present invention;

[0031] Figure 3 is a partial structure of the present invention Figure 1 ;

[0032] Figure 4 is a partial structure of the present invention Figure 2 ;

[0033] Figure 5 is the protection circuit diagram of the present invention;

[0034] Figure 6 is the effect diagram of the circuit board of the present invention;

[0035] Figure 7 is the three-dimensional view of the present invention Figure 1 ;

[0036] Figure 8 is the three-dimensional view of the present invention Figure 2 .

[0037] In the figure, 1. protective base; 101. extrusion airbag chamber; 102. expansion airbag chamber; 103. braking groove; 104. ventilation pipe; 2. protective top cover; 201. top cover slider; 202. braking block; 203. sealing plate groove; 3. braking airbag; 301. cylindrical airbag connecting pipe; 4. expansion airbag; 5. sealing plate; 501. sealing plate clamping block; 6. fixing block; 601. cylindrical airbag; 7. heat dissipation fixing plate; 701. heat dissipation support column; 703. heat dissipation hole; 704. semiconductor refrigeration ring; 8. circuit board; 801. circuit board support column; 9. wire; 10. battery box; 11. base clamping part; 12. assembly hole; 13. protection circuit; 14. feedback circuit; 15. water detection pad; 16. fuse. Detailed implementation manners

[0038] The following will describe in detail the implementation manners of the present application in conjunction with the accompanying drawings and embodiments, so as to fully understand the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects and implement accordingly. Embodiment

[0039] As Figures 1-8As shown in the figure, 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, playing a certain buffering role. When the pressure is relatively high, the protection top cover 2 gradually approaches the protection base 1. A connected extrusion airbag chamber 101 and a braking groove 103 are provided inside the protection base 1. A top cover slider 201 is connected to the bottom of the protection top cover 2, and a braking block 202 is connected to the bottom of the top cover slider 201. The top cover slider 201 is slidably arranged inside the braking groove 103, and the braking block 202 is slidably arranged inside the extrusion airbag chamber 101. A braking airbag 3 is fixedly arranged inside the extrusion airbag chamber 101, and an expansion airbag chamber 102 is provided inside the braking groove 103. An expansion airbag 4 is fixedly arranged inside the expansion airbag chamber 102. The expansion airbag 4 is connected to the braking airbag 3 through a ventilation pipe 104. The top cover slider 201 at the bottom of the protection top cover 2 is slidably arranged inside the braking groove 103. After the robot gradually descends into the water, as the depth increases, the pressure gradually increases, and the protection top cover 2 is extruded. After the protection top cover 2 is extruded, the top cover slider 201 on the protection top cover 2 slides inside the braking groove 103 and squeezes the braking airbag 3 inside the extrusion airbag chamber 101 through the braking block 202. After the braking airbag 3 is squeezed, the gas inside enters the expansion airbag 4 through the ventilation pipe 104, causing the expansion airbag 4 to expand. 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 is beneficial to protecting the electrical components inside the protection base 1. On the other hand, the braking airbag 3 can play a certain buffering role for the protection top cover 2, prevent excessive pressure from damaging the protection base 1 or the protection top cover 2, and reduce the service life of the protection base 1 or the protection top cover 2;

[0040] 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. A circuit board 8 is electrically connected to the battery box 10, and a wire 9 is electrically connected to the circuit board 8. 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 and is electrically connected to the circuit board 8. 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 arranged at the connection between the wire 9 and the protective base 1. 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 communicated with the braking airbag 3 through a cylindrical airbag connecting pipe 301. The wire 9 passes through the cylindrical airbag 601. First of all, the fixing block 6 can play a certain role in fixing the wire 9 and improve the stability of the wire 9. In addition, a cylindrical airbag 601 is fixedly arranged inside the fixing block 6. The wire 9 passes through the inside of the cylindrical airbag 601, and the cylindrical airbag 601 wraps around the outer side surface of the wire 9. Therefore, it can not only improve the stability of the wire 9, but also play a certain waterproof role;

[0041] Moreover, the cylindrical airbag 601 is communicated with the braking airbag 3 through the cylindrical airbag connecting pipe 301. After the braking 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 becomes greater. 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;

[0042] In addition, when the pressure on the braking 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 braking airbag 3 decreases, and the pressure between the cylindrical airbag 601 and the wire 9 also decreases accordingly. The heat inside the protective base 1 can completely dissipate through the gap between the cylindrical airbag 601 and the wire 9, which is convenient for dissipating the heat inside the protective base 1;

[0043] In order to further improve the waterproof performance of the device, a heat dissipation fixing plate 7 is fixedly arranged on the bottom side of the protective base 1. A number of heat dissipation support columns 701 are fixedly arranged on the heat dissipation fixing plate 7. The heat dissipation support columns 701 penetrate through the protective base 1 and are arranged inside the protective base 1. Heat dissipation holes 703 are formed at the connection between the heat dissipation support columns 701 and the heat dissipation fixing plate 7. A semiconductor refrigeration ring 704 is fixedly arranged on the outer side surface of the heat dissipation support column 701. The heat dissipation surface of the semiconductor refrigeration ring 704 is fixedly connected with the heat dissipation support column 701. A heat dissipation fixing plate 7 is fixedly arranged at the bottom of the protective base 1. A number of heat dissipation support columns 701 are arranged on the heat dissipation fixing plate 7 and penetrate through the protective base 1 and extend into the inside of the protective base 1. The semiconductor refrigeration ring 704 on the heat dissipation support column 701 absorbs the heat inside the protective base 1 and then transfers 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, which is convenient for dissipating the heat inside the protective base 1 and greatly improves the cooling efficiency.

[0044] In addition, a sealing plate groove 203 is formed on the protective top cover 2. A sealing plate 5 is slidably arranged inside the sealing plate groove 203. The sealing plate 5 is slidably clamped and connected with the sealing plate groove 203 through a sealing plate clamping block 501. A sealing pad 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. By sliding the sealing plate 5, it is convenient to repair the components inside the protective base 1, and at the same time, it is convenient to seal the protective base 1 and the protective top cover 2. The structure is simple and the convenience of use is improved.

[0045] Furthermore, as Figure 1 and Figure 7 shown, the circuit board 8 is fixedly arranged inside the protective base 1 through circuit board support columns 801. A base clamping part 11 is fixedly arranged on the bottom side of the protective base 1. A number of assembly holes 12 are formed on the base clamping part 11. The circuit board 8 is fixedly arranged inside the protective base 1 through circuit board support columns 801, which improves the stability of the circuit board 8. Through the base clamping part 11 and the assembly holes 12 on the protective base 1, it is convenient to install the protective base 1 and the convenience of use is improved. Embodiment

[0046] The lithium battery protection circuit of the underwater working robot provided in this embodiment, as Figure 5As shown, it includes a protection circuit 13. The protection circuit 13 is coupled to the circuit board 8. The protection circuit 13 includes an electrically connected chip U1 and chip U2. The CO pin of the chip U1 is connected to a detected water inlet pad 15 through a feedback circuit 14. The feedback circuit 14 includes a serially arranged transistor Q1 and transistor Q3. A fuse 16 is electrically connected to the VDD pin of the chip U1. One end of the detected water inlet pad 15 is electrically connected to the pin 1 of the fuse 16, and the other end of the detected water inlet 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 detected water inlet pad 15 is connected through the feedback circuit 14 on the protection circuit 13. The detected water inlet pad 15 includes two immersion gold pads, and they are arranged in a way of offset embedding. After water enters the interior of the protection base 1, water droplets will adhere to the detected water inlet pad 15, and the two offset immersion gold pads on the detected water inlet pad 15 will be short-circuited. After the short circuit occurs, the detected water inlet pad 15 will push information to the feedback circuit 14 and cause the fuse 16 to break. After the fuse 16 breaks, the power supply inside the battery box 10 stops supplying power, improving the protection performance of the lithium battery.

[0047] Further, as Figure 5 shown, the transistor Q1 and the transistor Q3 are connected in series and are in parallel with the detected water inlet pad 15. The detected water inlet pad 15 is electrically connected to the pin 1 of the transistor Q3 through a resistor R22. A resistor R7, a capacitor C3, and a diode DZ1 are arranged in parallel on the pin 1 and the pin 2 of the transistor Q3;

[0048] The pin 3 of the transistor Q3 is electrically connected to the pin 3 of the transistor Q1. The pin 1 of the transistor Q1 is electrically connected to the chip U1 through a resistor R7. A capacitor C8 and a resistor R9 are arranged in parallel on the pin 1 and the pin 2 of the transistor Q1. The pin 3 of the transistor Q3 and the transistor Q1 are used for functions such as detection, rectification, amplification, switching, and voltage regulation. In the common emitter circuit, a small change in the base current can control a large change in the collector current, thereby realizing signal amplification and improving the stability of the circuit.

[0049] Furthermore, a positive connection line P+ and a negative connection line P- are electrically connected to the chip U2. On one side of the positive connection line P+ and the negative connection line P-, a resistor R16, a diode D1, and a rectifier diode VD1 are connected in series. A capacitor C16 and a capacitor C19 are connected in parallel to the resistor R16, the diode D1, and the rectifier diode VD1. The series resistor R16 can limit the magnitude of the current, preventing other components in the circuit from being damaged due to excessive current, thereby protecting the stable operation of the circuit. Utilizing the one-way conductivity of the diode, the diode D1 is connected in series with a current-limiting resistor in the voltage stabilization circuit, so that the current does not exceed the allowable value after the voltage regulator diode breaks down, thereby providing a stable output voltage and also playing a protective role. The rectifier diode VD1 only allows the current to conduct in one direction and blocks the current in the other direction, providing stable DC power supply for the electronic device. The series resistor R16, the diode D1, and the rectifier diode VD1 each have unique functions and roles in the electronic circuit, jointly realizing the efficient and stable operation of the circuit;

[0050] A battery Cell1 is electrically connected to the pin VC1 of the chip U2, a battery Cell2 is electrically connected to the pin VC2 of the chip U2, a battery Cell3 is electrically connected to the pin VC3 of the chip U2, a battery Cell4 is electrically connected to the pin VC4 of the chip U2, a battery Cell5 is electrically connected to the pin VC5 of the chip U2, and a battery Cell6 is electrically connected to the pin VC6 of the chip U2. The battery Cell1, the battery Cell2, the battery Cell3, the battery Cell4, the battery Cell5, and the battery Cell6 are all fixedly arranged inside the battery box 10. Connecting multiple batteries electrically to the pins of the chip U2 ensures the stability of the circuit power supply, and at the same time, the structure is simple and the production cost is low.

[0051] As used in the specification and claims, certain terms are used 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. The specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction. As mentioned throughout the specification and claims, "comprising" is an open-ended term and should be interpreted as "including but not limited to". "Substantially" means within an acceptable error range. Those skilled in the art can solve technical problems within a certain error range and basically achieve the technical effect.

[0052] It should be noted that the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, such that a commodity or system comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such commodity or system. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the commodity or system comprising the element.

[0053] The above description illustrates and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the forms disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be altered within the scope of the inventive concept described herein through the above teachings or the skills or knowledge in the relevant field. Any alterations and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of 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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