Lithium battery protection plate with waterproof function

Abstract

The present application relates to the field of lithium battery, specifically relates to a lithium battery protection plate with waterproof function, including lithium battery body, one end of the lithium battery body is connected with the plug connector through the wire, the side wall of the lithium battery body is equipped with the protection plate body, one end of the protection plate body is equipped with the connecting port matched with the plug connector, the protection plate body includes the frame, the frame is arranged on the side wall of the lithium battery body, the inner chamber of the frame is equipped with the circuit board, one side of the frame is sealedly installed with the cover plate, the cover plate is equipped with the air duct, the heat conduction assembly and the sealing assembly are linked in the present application, the heat of the integrated heat sink is conducted to the sealing rubber ring in the low temperature environment, the characteristics of the copper sheet are used for quickly absorbing heat and the heat conduction oil is used for uniformly radiating heat, the sealing rubber ring temperature is accurately controlled, the waterproof failure caused by hardening and brittleness of the traditional silica gel sealing ring in the prior art in the low temperature environment is solved, and then the problems such as element short circuit, solder corrosion and the like are caused.

Description

Technical Field

[0001] This invention relates to the field of lithium batteries, and more specifically to a waterproof lithium battery protection board. Background Technology

[0002] A lithium battery protection board and a lithium battery are disclosed in application number CN201911101844.4. The lithium battery protection board includes: an FPC flexible board; electronic components are disposed on one side of the FPC flexible board in the thickness direction; the FPC flexible board includes copper foil; two extended copper foils are provided on one side of the copper foil, and the two extended copper foils are respectively used to connect the positive and negative electrodes of the battery cell; the extended copper foils and the copper foil are integrally formed; the purpose is to solve the problem that the existing lithium battery protection board has insufficient area for placing electronic components on the main board, which leads to high production costs of the battery protection board.

[0003] In the prior art including the aforementioned patents, the widespread application of lithium batteries in low-temperature scenarios such as outdoor and cold chain environments makes the waterproof performance of lithium battery protection boards crucial. Although traditional silicone sealing rings are commonly used for waterproof sealing, they harden and become brittle due to the restricted activity of molecular chain segments when exposed to low-temperature environments for extended periods. They are also prone to cracking under mechanical stress or thermal expansion and contraction, leading to moisture intrusion into the protection board and causing faults such as component short circuits and solder joint corrosion. Existing improvement methods are insufficient to completely solve this defect.

[0004] Therefore, it is necessary to invent a waterproof lithium battery protection board to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a waterproof lithium battery protection board. Through the linkage design of the heat conduction component and the sealing component, the heat of the integrated heat sink is conducted to the sealing ring in a low-temperature environment. By utilizing the characteristics of rapid heat absorption by the copper sheet and uniform heat dissipation by the heat-conducting oil, the temperature of the sealing ring is precisely controlled. This solves the problem that the traditional silicone sealing ring in the prior art fails to waterproof due to hardening and brittleness in a low-temperature environment, which in turn leads to short circuits of components and corrosion of solder joints.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A waterproof lithium battery protection board includes a lithium battery body, one end of which is connected to a connector via a wire, a protection board body is provided on the side wall of the lithium battery body, and one end of the protection board body is provided with a connection port that mates with the connector. The protection board body includes a frame, which is disposed on the side wall of the lithium battery body. The inner cavity of the frame is provided with a circuit board. A cover plate is sealed and installed on one side of the frame. An air duct is provided on the cover plate. A fan is connected to one end of the air duct. An installation plate is provided on one side of the air duct. The cover plate is provided with an integrated heat sink, which is attached to the surface of the heat-generating element on the circuit board, and multiple heat conduction components are provided through the integrated heat sink; The top of the frame is provided with multiple annular grooves, and the inner cavity of each annular groove is provided with a sealing component that is connected to the heat conduction component.

[0007] One end of the integrated heat sink is connected to a heat-conducting plate, which is attached to the heat-generating element on the circuit board via thermally conductive silicone. Fixing strips are provided on both sides of the integrated heat sink, and the fixing strips are mounted on the circuit board by bolts.

[0008] As a preferred embodiment of the present invention, the fan is provided with a plurality of exhaust pipes, and a cooling fan is provided inside the plurality of exhaust pipes.

[0009] As a preferred embodiment of the present invention, the air duct is provided with an air inlet and an air outlet, the air inlet of the air duct is connected to a fan, and the air outlet of the air duct is provided with dust-blocking louvers.

[0010] As a preferred embodiment of the present invention, the heat conduction component includes a metal heat conduction rod and a metal sleeve. One end of the metal heat conduction rod is mounted on an integrated heat sink, and the other end of the metal heat conduction rod has a slot. An insulation sleeve is provided on the outer wall of the metal heat conduction rod. The metal sleeve is installed on the inner wall of the frame. One end of the metal sleeve is provided with multiple heat-conducting strips, and the other end of the metal sleeve is slidably connected to a metal telescopic rod. One end of the metal telescopic rod is provided with a metal block that mates with the slot of the metal heat-conducting rod. The top of the metal telescopic rod is provided with a hydraulic telescopic rod. One end of the hydraulic telescopic rod is connected to a hydraulic cylinder. The inner cavity of the hydraulic cylinder is filled with oil. The top end of the hydraulic cylinder is threadedly connected to a threaded pressure rod. One end of the threaded pressure rod located in the inner cavity of the hydraulic cylinder is provided with a sealing plug. The other end of the threaded pressure rod is drivenly connected to a driver.

[0011] In a preferred embodiment of the present invention, two drivers are provided, and the two drivers are symmetrically arranged on the cover plate; The driver includes a motor, the power output shaft of which is drivenly connected to two threaded pressure rods.

[0012] In a preferred embodiment of the present invention, the sealing assembly includes a copper sheet, the copper sheet, the heat-conducting oil and the sealing ring are all located in the inner cavity of the annular groove, one end of the copper sheet is connected to the heat-conducting strip, the heat-conducting oil is in contact with the copper sheet, the sealing ring is located on one side of the heat-conducting oil, and a groove wall is provided between the sealing ring and the heat-conducting oil.

[0013] In a preferred embodiment of the present invention, the connection port is mounted on the circuit board, and one end of the connection port penetrates through the side wall of the frame.

[0014] Compared with the prior art, the technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. By linking the heat conduction component and the sealing component, the heat from the integrated heat sink is accurately transferred to the sealing ring in a low-temperature environment. The copper sheet and heat-conducting oil are used to control the temperature evenly, preventing the sealing ring from hardening and becoming brittle and cracking. This solves the problem of low-temperature waterproof failure of traditional silicone sealing rings from the root, and effectively prevents moisture intrusion from causing component failure.

[0015] 2. Through the efficient cooperation of the fan, air duct and integrated heat sink, when the equipment is running at high temperature, the cold air is quickly drawn in to cool the integrated heat sink. The heat is then conducted and dissipated in time through the heat conduction plate, avoiding the risk of performance degradation, shortened life and thermal runaway of the components due to high temperature. This effectively improves the safety and stability of the equipment in high temperature environment and makes up for the shortcomings of traditional protection boards in heat dissipation at high temperature. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the protective plate body structure of the present invention; Figure 3 This is a schematic diagram of the fan structure of the present invention; Figure 4 This is a schematic cross-sectional view of the air duct structure of the present invention; Figure 5 This is a schematic cross-sectional view of the frame structure of the present invention. Figure 1 ; Figure 6 This is a schematic cross-sectional view of the frame structure of the present invention. Figure 2 ; Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is a schematic diagram of the heat conduction component structure of the present invention; Figure 9 This is a schematic diagram of the metal heat-conducting rod and metal block structure of the present invention; Figure 10 This is a schematic cross-sectional view of the heat conduction component of the present invention; Figure 11 This is a schematic diagram of the connection structure between the driver and the threaded pressure rod of the present invention.

[0018] Explanation of reference numerals in the attached figures: 1. Lithium battery body; 11. Connector; 12. Circuit board; 13. Connection port; 2. Protection board body; 21. Frame; 22. Cover plate; 23. Air duct; 24. Fan; 25. Integrated heat sink; 251. Heat conduction plate; 252. Fixing strip; 26. Heat conduction component; 261. Metal heat conduction rod; 262. Metal sleeve; 263. Heat conduction strip; 264. Metal telescopic rod; 265. Metal block; 266. Hydraulic telescopic rod; 267. Hydraulic cylinder; 268. Threaded pressure rod; 27. Sealing component; 271. Copper sheet; 272. Heat transfer oil; 273. Sealing ring; 28. Driver; 281. Motor. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] This invention provides, for example Figures 1-11 The diagram shows a waterproof lithium battery protection board, comprising a lithium battery body 1, one end of which is connected to a connector 11 via a wire, and a protection board body 2 on the side wall of the lithium battery body 1, one end of which has a connection port 13 that mates with the connector 11. Connecting the connector 11 to the lithium battery body 1 via a wire makes it easier to connect the lithium battery to external devices. The mating of the connection port 13 and the connector 11 ensures the stability of the circuit connection and provides the basic conditions for the normal operation of the lithium battery protection board. The protection board body 2 includes a frame 21, which is located on the side wall of the lithium battery body 1. The inner cavity of the frame 21 contains a circuit board 12. A cover plate 22 is sealed and installed on one side of the frame 21. An air duct 23 is provided on the cover plate 22. One end of the air duct 23 is connected to a fan 24. A mounting plate is provided on one side of the air duct 23. The frame 21 protects the circuit board 12 from external physical damage. The sealed cover plate 22, together with the air duct 23 and the fan 24, forms a good heat dissipation channel, which can effectively cope with the high temperature of the equipment working environment and ensure the stable operation of the circuit board 12. The cover plate 22 is provided with an integrated heat sink 25, which is attached to the surface of the heat-generating element on the circuit board 12. Multiple heat conduction components 26 are provided through the integrated heat sink 25. The integrated heat sink 25 is attached to the heat-generating element, which can quickly conduct the heat generated by the heat-generating element to itself. With the help of the heat conduction components 26, the temperature of the circuit board 12 can be effectively controlled, whether it is heat dissipation in a high-temperature environment or heat reuse in a low-temperature environment, thus improving the overall performance of the protection board. The top of the frame 21 has multiple annular grooves, and the inner cavity of the multiple annular grooves is provided with sealing components 27 connected to the heat conduction component 26. The arrangement of the annular grooves and sealing components 27 enables the heat conduction component 26 to conduct heat to the sealing component 27. In low-temperature environments, the sealing ring 273 can be heated to prevent it from hardening and causing a decrease in waterproof performance, thus ensuring the waterproof effect of the protective plate in different temperature environments.

[0021] Furthermore, one end of the integrated heat sink 25 is connected to a heat-conducting plate 251. The heat-conducting plate 251 is attached to the heating element on the circuit board 12 through thermally conductive silicone. Fixing strips 252 are provided on both sides of the integrated heat sink 25, and the fixing strips 252 are installed on the circuit board 12 by bolts. The cooperation between the heat-conducting plate 251 and the thermally conductive silicone enhances the heat conduction efficiency from the heating element to the integrated heat sink 25. The fixing strips 252 are fixed by bolts to ensure the firmness of the integrated heat sink 25 installation and ensure the stable operation of the heat dissipation function.

[0022] Furthermore, the fan 24 is equipped with multiple exhaust pipes, each containing a cooling fan. The exhaust pipes and cooling fans accelerate airflow and quickly dissipate heat from the integrated heat sink 25. When the equipment is running at high temperatures, this helps to reduce the temperature of the circuit board 12 in a timely manner, preventing electronic components from experiencing performance degradation and shortened lifespan due to overheating.

[0023] Furthermore, the air duct 23 is provided with an air inlet and an exhaust end. The air inlet of the air duct 23 is connected to the fan 24, and the exhaust end of the air duct 23 is provided with dust-proof louvers. The air inlet is connected to the fan 24, and the exhaust end is provided with dust-proof louvers. While realizing air circulation and heat dissipation, it can effectively block dust from entering the air duct 23 and the interior of the protective plate, prevent dust accumulation from affecting equipment performance, and extend the service life of the equipment.

[0024] Furthermore, the heat conduction assembly 26 includes a metal heat-conducting rod 261 and a metal sleeve 262. One end of the metal heat-conducting rod 261 is mounted on the integrated heat sink 25, and the other end of the metal heat-conducting rod 261 has a slot. An insulation sleeve is provided on the outer side wall of the metal heat-conducting rod 261. The metal sleeve 262 is mounted on the inner side wall of the frame 21. One end of the metal sleeve 262 has multiple heat-conducting strips 263, and the other end of the metal sleeve 262 is slidably connected to a metal telescopic rod 264. One end of the metal telescopic rod 264 has a metal block 265 that mates with the slot of the metal heat-conducting rod 261. The top of the metal telescopic rod 264 has a hydraulic telescopic rod 266, which is hydraulically telescopic. One end of the rod 266 is connected to a hydraulic cylinder 267, the inner cavity of the hydraulic cylinder 267 is filled with oil, and the top end of the hydraulic cylinder 267 is threadedly connected to a threaded pressure rod 268. One end of the threaded pressure rod 268 located in the inner cavity of the hydraulic cylinder 267 is provided with a sealing plug, and the other end of the threaded pressure rod 268 is drivenly connected to a driver 28. The heat conduction component 26 controls the heat conduction path by connecting and disconnecting the metal block 265 and the metal heat conduction rod 261. In low-temperature environments, the heat of the integrated heat sink 25 can be conducted to the sealing component 27 to prevent the sealing ring 273 from hardening. When heat conduction is not required, heat transfer can be blocked to ensure the flexibility of equipment temperature control.

[0025] Furthermore, there are two actuators 28, which are symmetrically arranged on the cover plate 22. Each actuator 28 includes a motor 281, and the power output shaft of the motor 281 is connected to two threaded pressure rods 268. The two symmetrically arranged actuators 28 can drive the threaded pressure rods 268 to rotate more stably, accurately control the pressure in the hydraulic cylinder 267, and thus accurately control the connection state between the metal block 265 and the metal heat-conducting rod 261, ensuring the accuracy and reliability of heat conduction control.

[0026] Furthermore, the sealing assembly 27 includes a copper sheet 271, with the copper sheet 271, heat-conducting oil 272, and sealing ring 273 all located within the annular groove. One end of the copper sheet 271 is connected to the heat-conducting strip 263, the heat-conducting oil 272 is in contact with the copper sheet 271, and the sealing ring 273 is located on one side of the heat-conducting oil 272. A groove wall is provided between the sealing ring 273 and the heat-conducting oil 272. The copper sheet 271 can quickly absorb the heat conducted in, and the heat-conducting oil 272 distributes the heat evenly, preventing the sealing ring 273 from being too hot or too cold in some areas. This effectively prevents the sealing ring 273 from hardening or melting due to temperature issues, ensuring that the protective plate still has good waterproof performance in low-temperature environments.

[0027] Furthermore, the connector 13 is mounted on the circuit board 12, and one end of the connector 13 penetrates the side wall of the frame 21. The connector 13 is mounted on the circuit board 12 and penetrates the side wall of the frame 21, making the circuit connection between the connector 11 and the circuit board 12 more direct and efficient, reducing signal transmission loss, and ensuring the stability and reliability of the connection between the lithium battery and external devices.

[0028] Working principle: First, when the ambient temperature of the equipment is high and it is necessary to cool down the protection board body 2, the cooling fan inside the fan 24 can be started. The fan will draw air in through the dust-proof louvers of the air duct 23. After the cold air enters the air duct 23, it will cool the surface of the integrated heat sink 25 located in the air duct 23. The cooled air will be discharged through the exhaust pipe on the fan 24. After the temperature of the integrated heat sink 25 drops, the heat generated by the heat-generating components on the circuit board 12 will be conducted to the integrated heat sink 25 through the heat conduction plate 251 for cooling. When the circuit board 12 is running for a long time, the resistance will generate heat. Especially when the lithium battery is charging and discharging at a high current, the power consumption of these components will increase and the heat generated will be even greater. This structure can enhance air circulation and conduct heat through the integrated heat sink 25 for rapid cooling. This avoids the performance degradation and lifespan shortening of the electronic components in the protection board due to excessively high temperatures, as well as safety issues such as thermal runaway, thus improving the safety of equipment use. Secondly, when the operating temperature of the equipment is low, to address the poor waterproofing effect caused by the hardening of the sealing rubber ring 273 due to low temperature, the driver 28 can drive the two adjacent threaded pressure rods 268 to rotate. Through the interaction between the threads, the threaded pressure rods 268 push the sealing plug to pressurize the inner cavity of the hydraulic cylinder 267, causing the oil in the inner cavity of the hydraulic cylinder 267 to be squeezed into the inner cavity of the hydraulic telescopic rod 266. At this time, the hydraulic telescopic rod 266 extends, pushing the metal block 265 into the slot of the metal heat-conducting rod 261, causing the metal block 265 to come into contact with the metal heat-conducting rod 261. At this time, the fan 24 can be turned off, and the heat on the integrated heat sink 25 will be transferred through the metal heat-conducting rod 261. Heat is conducted to the metal block 265, and then further conducted through the metal sleeve 262 and the heat-conducting strip 263 to the copper sheet 271. The heat from the copper sheet 271 then heats the heat-conducting oil 272, raising the temperature of the sealing ring 273. The copper sheet 271 can quickly absorb the heat conducted by the metal sleeve 262 and the heat-conducting strip 263. When the heat-conducting oil 272 is in contact with the copper sheet 271, because the oil is oily, it absorbs the heat and distributes it evenly to avoid uneven temperature distribution. Furthermore, the oily nature of the heat-conducting oil 272 prevents localized overheating that could cause the sealing ring 273 to melt. It should be noted that when heat conduction is not required to increase the temperature of the sealing ring 273, the threaded pressure rod 268 can be driven to rotate and move to the top by the driver 28, which reduces the pressure inside the hydraulic cylinder 267. The oil enters the inner cavity of the hydraulic cylinder 267 through the pressure difference, causing the hydraulic telescopic rod 266 to contract and disconnect the connection between the metal block 265 and the metal heat-conducting rod 261, thereby achieving the effect of blocking heat conduction. This structure uses the disconnection and connection between the metal block 265 and the metal heat-conducting rod 261 to heat the sealing ring 273 through conduction. This avoids the problem of reduced sealing effect and loss of waterproof function caused by the sealing ring 273 hardening due to low ambient temperature, so that the equipment can still have high waterproof performance in low temperature environment.

[0029] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A waterproof lithium battery protection board, characterized in that: The lithium battery body (1) is provided with a connector (11) connected to one end of the lithium battery body (1) via a wire. A protective plate body (2) is provided on the side wall of the lithium battery body (1). A connection port (13) that mates with the connector (11) is provided at one end of the protective plate body (2). The protective plate body (2) includes a frame (21), which is located on the side wall of the lithium battery body (1). The inner cavity of the frame (21) is provided with a circuit board (12). A cover plate (22) is sealed and installed on one side of the frame (21). An air duct (23) is provided on the cover plate (22). A fan (24) is connected to one end of the air duct (23). An installation plate is provided on one side of the air duct (23). The cover plate (22) is provided with an integrated heat sink (25), which is attached to the surface of the heat-generating element on the circuit board (12), and multiple heat conduction components (26) are provided through the integrated heat sink (25). The top of the frame (21) is provided with multiple annular grooves, and the inner cavity of the multiple annular grooves is provided with a sealing component (27) connected to the heat conduction component (26). The heat conduction component (26) includes a metal heat conduction rod (261) and a metal sleeve (262). One end of the metal heat conduction rod (261) is mounted on the integrated heat sink (25), and the other end of the metal heat conduction rod (261) is provided with a slot. An insulation sleeve is provided on the outer wall of the metal heat conduction rod (261). The metal sleeve (262) is installed on the inner wall of the frame (21). One end of the metal sleeve (262) is provided with multiple heat-conducting strips (263), and the other end of the metal sleeve (262) is slidably connected to a metal telescopic rod (264). One end of the metal telescopic rod (264) is provided with a metal block (265) that mates with a slot in the metal heat-conducting rod (261). The top of the metal telescopic rod (264) is provided with a hydraulic telescopic rod (266), and one end of the hydraulic telescopic rod (266) is connected to a hydraulic cylinder (267). The inner cavity of the pressure cylinder (267) is filled with oil. The top end of the hydraulic pressure cylinder (267) is threadedly connected to a threaded pressure rod (268). One end of the threaded pressure rod (268) located in the inner cavity of the hydraulic pressure cylinder (267) is provided with a sealing plug. The other end of the threaded pressure rod (268) is driven to be connected to a driver (28). The driver (28) drives the threaded pressure rod (268) to extend and retract the hydraulic telescopic rod (266), thereby controlling the insertion and separation of the metal block (265) and the slot of the metal heat-conducting rod (261), and realizing the controllable opening and closing of the heat conduction path. The sealing assembly (27) includes a copper sheet (271), the copper sheet (271), the heat-conducting oil (272) and the sealing ring (273) are all located in the inner cavity of the annular groove. One end of the copper sheet (271) is connected to the heat-conducting strip (263). The heat-conducting oil (272) is in contact with the copper sheet (271). The sealing ring (273) is located on one side of the heat-conducting oil (272). A groove wall is provided between the sealing ring (273) and the heat-conducting oil (272).

2. The waterproof lithium battery protection board according to claim 1, characterized in that: One end of the integrated heat sink (25) is connected to a heat-conducting plate (251). The heat-conducting plate (251) is attached to the heating element on the circuit board (12) by thermally conductive silicone. Fixing strips (252) are provided on both sides of the integrated heat sink (25). The fixing strips (252) are installed on the circuit board (12) by bolts.

3. A waterproof lithium battery protection board according to claim 1, characterized in that: The fan (24) is provided with multiple exhaust pipes, and each of the multiple exhaust pipes is provided with a cooling fan.

4. A waterproof lithium battery protection board according to claim 3, characterized in that: The air duct (23) is provided with an air inlet and an air outlet. The air inlet of the air duct (23) is connected to the fan (24), and the air outlet of the air duct (23) is provided with dust-proof louvers.

5. A waterproof lithium battery protection board according to claim 1, characterized in that: Two drivers (28) are provided, and the two drivers (28) are symmetrically arranged on the cover plate (22); The driver (28) includes a motor (281), the power output shaft of which is connected to two threaded rods (268) in a transmission connection.

6. A waterproof lithium battery protection board according to claim 1, characterized in that: The connector (13) is mounted on the circuit board (12), and one end of the connector (13) penetrates the side wall of the frame (21).

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