Improved cylindrical lithium battery monomer based on heat pipe cooling and lithium battery pack

Abstract

The invention provides an improved cylindrical lithium battery monomer based on heat pipe cooling and a lithium battery pack, the improved cylindrical lithium battery monomer comprises a ventilation assembly, the ventilation assembly comprises a shell, an electrode material layer, a hollow reel and a heat dissipation heat pipe, the ventilation assembly is arranged in an inner cavity of a box body, a battery assembly is arranged on the surface of the box body, and the heat dissipation heat pipe is arranged in the inner cavity of the box body. The battery assembly comprises a fan, a temperature detection module and a controller, a fixing assembly is arranged on the surface of the box body, the fixing assembly comprises a rotary knob, the rotary knob is movably connected to the front side of the box body, and by arranging the ventilation assembly, the effect of rapidly cooling the interior of the electrode material layer is achieved; therefore, the problem that the overall service life of the battery is shortened due to the fact that the interior of the single battery is in a high-temperature state for a long time caused by heat accumulation in the electrode material layer is solved, and the battery assembly is arranged to effectively avoid that heat dissipated by the ventilation assembly is accumulated in the inner cavity of the box body and cannot be discharged.

Description

Technical Field

[0001] The present invention relates to an improved cylindrical lithium battery cell and a lithium battery pack based on heat pipe cooling, belonging to the technical field of lithium batteries. Background Art

[0002] Lithium-ion power batteries have become the main choice for power devices of new energy vehicles and large-scale energy storage systems because of their advantages such as high energy density, long cycle life, and environmental friendliness. However, as an electrochemical power source, during the charging and discharging process of lithium-ion batteries, excessive temperature caused by self-heating and thermal runaway caused by misuse of working conditions will pose serious safety hazards, which is exactly the main problem faced by lithium-ion batteries during large-scale applications at present.

[0003] However, due to the internal layered structure of cylindrical lithium-ion batteries and the poor thermal conductivity of the contact thermal resistance between layers and the electrode functional layers themselves, the overall internal thermal resistance of the battery is large and the self-cooling performance is poor. In this way, during the actual use and operation of cylindrical lithium batteries, when using conventional external cooling methods for temperature reduction, although the outer surface of the battery can be cooled and dissipated heat in a timely and effective manner, the heat generated inside the battery will continuously accumulate to form internal high temperature due to the inability to quickly dissipate. During the long-term operation under such a large temperature difference between the inside and outside, the battery capacity attenuation rate will accelerate, shortening the overall battery life. At the same time, the batteries in the battery pack are usually fixed with glue, cable ties or screws, making the disassembly and assembly of the batteries in the battery pack cumbersome and inconvenient, and not convenient for operators to use.

[0004] Therefore, an improved cylindrical lithium battery cell and a lithium battery pack based on heat pipe cooling are proposed. Summary of the Invention

[0005] In view of this, the present invention provides an improved cylindrical lithium battery cell and a lithium battery pack based on heat pipe cooling to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial option.

[0006] The technical solution of the present invention is implemented as follows: An improved cylindrical lithium battery monomer and lithium battery pack based on heat pipe cooling, including a ventilation component. The ventilation component includes a housing, an electrode material layer, a hollow reel, and heat dissipation heat pipes. The electrode material layer is fixedly installed in the inner cavity of the housing, the electrode material layer is wound around the surface of the hollow reel, a foam metal skeleton is fixedly installed in the inner cavity of the hollow reel, the evaporation section at the bottom of the heat dissipation heat pipe is fixedly installed inside the foam metal skeleton, the inner cavity of the hollow reel and the inside of the foam metal skeleton are filled with thermal conductive silicone grease, an insulating and heat conductive coating is applied on the surface of the heat dissipation heat pipe, fins are fixedly installed at the condensation sections at the top of the heat dissipation heat pipes, a positive electrode tab is fixedly installed at the positive electrode end of the electrode material layer, and a positive electrode end cover is fixedly installed at the top of the housing.

[0007] Further preferably, a fastener is fixedly installed at the top of the positive electrode end cover, and the heat dissipation heat pipe penetrates through the inside of the fastener and extends to the top of the housing.

[0008] Further preferably, a partition is fixedly installed in the inner cavity of the housing, a safety valve is fixedly installed at the top of the partition, and a ventilation hole is opened at the top of the positive electrode end cover.

[0009] Further preferably, it includes a box body. Ventilation components are arranged in the inner cavity of the box body, a battery component is arranged on the surface of the box body. The battery component includes a fan, a temperature detection module, and a controller. The three fans are all fixedly installed on the left side of the inner cavity of the fan, a controller is fixedly installed at the rear side of the inner cavity of the box body, a temperature detection module is fixedly installed at the middle of the rear side of the inner cavity of the box body, a fixing component is arranged on the surface of the box body. The fixing component includes a knob, the knob is movably connected to the front side of the box body, a bidirectional screw is fixedly connected to the rear side of the knob, screw plates are threadedly connected to both the front and rear sides of the surface of the bidirectional screw, additional plates are fixedly installed inside both screw plates, and the twelve additional plates are all attached to the front and rear sides of the six ventilation components.

[0010] Further preferably, a control module and a fan speed regulation module are arranged in the inner cavity of the controller. The output end of the temperature detection module is electrically connected to the input end of the control module, the output end of the control module is electrically connected to the input end of the fan speed regulation module, and the output end of the fan speed regulation module is electrically connected to the input end of the fan.

[0011] Further preferably, the thread directions on the front and rear sides of the bidirectional screw are opposite, and the thread pitches on the front and rear sides of the bidirectional screw are the same.

[0012] Further preferably, guide rods are fixedly installed on both the left and right sides of the inner cavity of the box body, and the left and right sides of both screw plates are slidably connected to the surfaces of the two guide rods.

[0013] Further preferably, a fixing bolt is threadedly connected to the surface of the knob, and the rear side of the fixing bolt is threadedly connected to the inner surface of the box body.

[0014] Due to the adoption of the above technical solutions in the embodiments of the present invention, it has the following advantages:

[0015] 1. By providing a ventilation component in the present invention, the hollow reel is used to install the heat dissipation heat pipe, and the evaporation section of the heat dissipation heat pipe is extended into the interior of the hollow reel, and the condensation section of the heat dissipation heat pipe is extended out of the exterior of the housing. At this time, the heat generated during the operation of the electrode material layer can be directly and quickly led out to the exterior of the housing by using the heat dissipation heat pipe, realizing the direct and rapid release of the heat inside the electrode material layer, achieving the effect of quickly cooling the inside of the electrode material layer, thereby avoiding the problem that the heat accumulation inside the electrode material layer causes the inside of the battery cell to be in a high temperature state for a long time, accelerating the attenuation rate of the battery capacity, and shortening the overall life of the battery. By providing a safety valve and a ventilation hole, and when the heat dissipation heat pipe is damaged and the high-pressure and low-temperature refrigerant inside instantly forms a high-pressure gas and leaks into the hollow reel, the pores of the foam metal skeleton can be used as the leakage channel of the high-pressure gas, and the high-pressure gas can be discharged to the outside of the housing through the ventilation hole and the safety valve, avoiding the impact and vibration damage of the high-pressure gas on the electrode material layer, thereby improving the safety and reliability when the heat dissipation heat pipe is directly extended into the battery cell for heat extraction operation.

[0016] 2. By providing a battery component in the present invention, the temperature detection module detects the heat dissipated by the ventilation component in the inner cavity of the box body. At this time, the temperature detection module transmits the detected value to the control module, and the control module controls the fan speed regulation module to operate. The fan speed regulation module outputs to the fans, and the three fans respectively send air to cool the housing and the heat dissipation heat pipe, effectively avoiding the situation that the heat dissipated by the ventilation component accumulates in the inner cavity of the box body and cannot be discharged, resulting in damage to the components of the ventilation component, and improving the stability of the ventilation component during use.

[0017] 3. By providing a fixing component in the present invention, through the rotation of the knob, the clamping plate clamps and fixes the ventilation component. This method can quickly disassemble and assemble the ventilation component, improving the convenience and efficiency of disassembling and assembling the ventilation component, facilitating the quick replacement of a damaged ventilation component in the box body, and being convenient for the operator to use. By providing a guide rod, the movement of the fixing bolt can be limited, avoiding the deviation of the fixing bolt during movement, thereby affecting the fixing work of the ventilation component. By providing a fixing bolt, the knob can be positioned, avoiding accidental rotation of the knob, thereby affecting the stability of fixing the ventilation component.

[0018] The above summary is for the purpose of the specification only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 Schematic structural diagram of the battery assembly of the present invention;

[0021] Figure 2 Schematic structural diagram of the safety valve of the present invention;

[0022] Figure 3 Schematic structural diagram of the electrode material layer of the present invention;

[0023] Figure 4 Schematic structural diagram of the hollow reel of the present invention;

[0024] Figure 5 Schematic structural diagram of the ventilation assembly of the present invention;

[0025] Figure 6 Schematic structural diagram of the fixing assembly of the present invention;

[0026] Figure 7 Schematic structural diagram of the system of the present invention.

[0027] Reference numerals: 1, box body; 2, battery assembly; 201, fan; 202, temperature detection module; 203, controller; 204, control module; 205, fan speed regulation module; 3, ventilation assembly; 301, housing; 302, electrode material layer; 303, hollow reel; 304, foam metal skeleton; 305, heat dissipation heat pipe; 306, fin; 307, partition plate; 308, positive end cover; 309, fastener; 310, safety valve; 311, vent hole; 312, positive electrode tab; 4, fixing assembly; 401, knob; 402, bidirectional screw; 403, screw plate; 404, additional plate; 405, guide rod; 406, fixing bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In the following text, only some exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present invention. Therefore, the drawings and the description are to be regarded as illustrative in nature and not restrictive.

[0029] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Embodiment 1

[0031] As Figures 1-4 shown, the embodiment of the present invention provides an improved cylindrical lithium battery cell and a lithium battery pack based on heat pipe cooling, including a ventilation component 3. The ventilation component 3 includes a housing 301, an electrode material layer 302, a hollow reel 303, and a heat dissipation heat pipe 305. The electrode material layer 302 is fixedly installed in the inner cavity of the housing 301, the electrode material layer 302 is wound around the surface of the hollow reel 303, a foam metal skeleton 304 is fixedly installed in the inner cavity of the hollow reel 303, the evaporation section at the bottom of the heat dissipation heat pipe 305 is fixedly installed inside the foam metal skeleton 304, the inner cavity of the hollow reel 303 and the inside of the foam metal skeleton 304 are filled with thermal conductive silicone grease, an insulating and thermally conductive coating is applied to the surface of the heat dissipation heat pipe 305, fins 306 are fixedly installed at the condensation sections at the top of the heat dissipation heat pipe 305, a positive electrode tab 312 is fixedly installed at the positive end of the electrode material layer 302, a positive end cover 308 is fixedly installed at the top of the housing 301, a fastener 309 is fixedly installed at the top of the positive end cover 308, the heat dissipation heat pipe 305 passes through the inside of the fastener 309 and extends to the top of the housing 301, a partition 307 is fixedly installed in the inner cavity of the housing 301, a safety valve 310 is fixedly installed at the top of the partition 307, and a vent hole 311 is formed at the top of the positive end cover 308.

[0032] By setting up the ventilation component 3, the hollow reel 303 is used to install the heat dissipation heat pipe 305, and the evaporation section of the heat dissipation heat pipe 305 is extended into the interior of the hollow reel 303, while the condensation section of the heat dissipation heat pipe 305 is extended outside the housing 301. At this time, by using the heat dissipation heat pipe 305, the heat generated during the operation of the electrode material layer 302 can be directly and quickly led out to the outer surface of the housing 301, realizing the direct and rapid release of the heat inside the electrode material layer 302, achieving the effect of quickly cooling the inside of the electrode material layer 302, thereby avoiding the problem that the heat accumulation inside the electrode material layer 302 causes the inside of the battery cell to be in a high temperature state for a long time, accelerating the attenuation rate of the battery capacity, and shortening the overall life of the battery. By setting up the safety valve 310 and the ventilation hole 311, and when the heat dissipation heat pipe 305 is damaged and the high-pressure and low-temperature refrigerant inside instantly forms high-pressure gas and leaks into the hollow reel 303, the pores of the foam metal skeleton 304 can be used as the leakage channel for the high-pressure gas, and the high-pressure gas is discharged to the outside of the housing 301 through the ventilation hole 311 and the safety valve 310, avoiding the impact and vibration damage of the high-pressure gas to the electrode material layer 302, thereby improving the safety and reliability when the heat dissipation heat pipe 305 is directly extended into the battery cell to conduct the heat extraction operation.

[0033] Embodiment 2

[0034] As Figures 5-7 shown, in one embodiment, it includes a box body 1. A ventilation component 3 is provided in the inner cavity of the box body 1, and a battery component 2 is provided on the surface of the box body 1. The battery component 2 includes a fan 201, a temperature detection module 202, and a controller 203. The three fans 201 are all fixedly installed on the left side of the inner cavity of the fan 201. The controller 203 is fixedly installed at the rear of the inner cavity of the box body 1, and the temperature detection module 202 is fixedly installed at the middle end of the rear side of the inner cavity of the box body 1. A control module 204 and a fan speed regulation module 205 are provided in the inner cavity of the controller 203. The output end of the temperature detection module 202 is electrically connected to the input end of the control module 204, the output end of the control module 204 is electrically connected to the input end of the fan speed regulation module 205, and the output end of the fan speed regulation module 205 is electrically connected to the input end of the fan 201.

[0035] By setting up the battery component 2, the temperature detection module 202 detects the heat dissipated by the ventilation component 3 in the inner cavity of the box body 1. At this time, the temperature detection module 202 transmits the detected value to the control module 204, and the control module 204 controls the fan speed regulation module 205 to operate. The fan speed regulation module 205 outputs to the fan 201, and the three fans 201 respectively send air to cool the housing 301 and the heat dissipation heat pipe 305, effectively avoiding the situation that the heat dissipated by the ventilation component 3 accumulates in the inner cavity of the box body 1 and cannot be discharged, resulting in damage to the components of the ventilation component 3, and improving the stability of the ventilation component 3 during use.

[0036] Example 3

[0037] As Figures 5-6 shown, in one embodiment, a fixing component 4 is provided on the surface of the box body 1. The fixing component 4 includes a knob 401 which is movably connected to the front side of the box body 1. A bidirectional screw 402 is fixedly connected to the rear side of the knob 401. Threaded plates 403 are threadedly connected to both the front and rear sides of the surface of the bidirectional screw 402. Reinforcing plates 404 are fixedly installed on the inner sides of the two threaded plates 403. The twelve reinforcing plates 404 are all in contact with the front and rear sides of the six ventilation components 3. The thread directions on the front and rear sides of the bidirectional screw 402 are opposite, and the thread pitches on the front and rear sides of the bidirectional screw 402 are the same. Guide rods 405 are fixedly installed on both the left and right sides of the inner cavity of the box body 1. The left and right sides of the two threaded plates 403 are slidably connected to the surfaces of the two guide rods 405. A fixing bolt 406 is threadedly connected to the surface of the knob 401, and the rear side of the fixing bolt 406 is threadedly connected to the inner surface of the box body 1.

[0038] By providing the fixing component 4, through the rotation of the knob 401, the reinforcing plates 404 clamp and fix the ventilation component 3. This method can quickly disassemble and assemble the ventilation component 3, improving the convenience and efficiency of disassembling and assembling the ventilation component 3, and facilitating the quick replacement of a damaged ventilation component 3 in the box body 1, making it convenient for the operator to use. By providing the guide rods 405, the movement of the fixing bolt 406 can be limited to prevent the fixing bolt 406 from shifting during movement, thus affecting the fixing work of the ventilation component 3. By providing the fixing bolt 406, the knob 401 can be positioned to prevent the knob 401 from accidentally rotating, thus affecting the stability of fixing the ventilation component 3.

[0039] When the present invention is in operation: The heat dissipated by the electrode material layer 302 during operation is conducted to the evaporation section of the heat dissipation heat pipe 305 through the hollow reel 303 and the thermal conductive silicone grease filled inside the foam metal skeleton 304. At this time, the heat is conducted to the condensation section of the heat dissipation heat pipe 305 through the heat dissipation heat pipe 305. At this time, the heat accumulated in the condensation section of the heat dissipation heat pipe 305 is dissipated into the air through the fins 306, thereby completing the heat dissipation work inside the housing 301. The temperature detection module 202 detects the temperature in the inner cavity of the box body 1. When the temperature is relatively high, the value is transmitted to the control module 204 through the temperature detection module 202. The control module 204 controls the fan speed regulation module 205 to output, so that the blower 201 outputs. As the blower 201 rotates, the blower 201 discharges the external air to the surface of the ventilation component 3. As the air circulates, the air carries the heat dissipated from the surface of the ventilation component 3, thereby realizing the cooling work of the inner cavity of the box body 1 and the surface of the ventilation component 3. When it is necessary to install the ventilation component 3, by rotating the knob 401, at this time, the bidirectional screw 402 rotates synchronously, so that the screw plate 403 and the adding plate 404 move inward. After the adding plate 404 fixes the ventilation component 3, the knob 401 is fixed through the fixing bolt 406, thereby completing the overall installation and fixing work of the ventilation component 3.

[0040] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various changes or substitutions thereof, and these should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An improved cylindrical lithium battery cell based on heat pipe cooling, including a ventilation component (3), characterized in that, The ventilation component (3) includes a housing (301), an electrode material layer (302), a hollow reel (303), and a heat dissipation heat pipe (305). The electrode material layer (302) is fixedly installed in the inner cavity of the housing (301). The electrode material layer (302) is wound around the surface of the hollow reel (303). A foam metal skeleton (304) is fixedly installed in the inner cavity of the hollow reel (303). The evaporation section at the bottom of the heat dissipation heat pipe (305) is fixedly installed inside the foam metal skeleton (304). The inner cavity of the hollow reel (303) and the inside of the foam metal skeleton (304) are filled with thermal conductive silicone grease. An insulating and heat conductive coating is applied to the surface of the heat dissipation heat pipe (305). Fins (306) are fixedly installed at the condensation sections at the top of the heat dissipation heat pipe (305). A positive electrode tab (312) is fixedly installed at the positive electrode end of the electrode material layer (302). A positive electrode end cover (308) is fixedly installed at the top of the housing (301).

2. An improved cylindrical lithium battery cell based on heat pipe cooling according to claim 1, characterized in that: A fastener (309) is fixedly installed at the top of the positive electrode end cover (308). The heat dissipation heat pipe (305) passes through the inside of the fastener (309) and extends to the top of the housing (301).

3. An improved cylindrical lithium battery cell based on heat pipe cooling according to claim 1, characterized in that: A partition plate (307) is fixedly installed in the inner cavity of the housing (301). A safety valve (310) is fixedly installed at the top of the partition plate (307). A ventilation hole (311) is opened at the top of the positive electrode end cover (308).

4. A lithium battery pack according to any one of claims 1-3, comprising a box body (1), characterized in that: The ventilation components (3) are arranged in the inner cavity of the box body (1). A battery component (2) is arranged on the surface of the box body (1). The battery component (2) includes a fan (201), a temperature detection module (202), and a controller (203). The three fans (201) are all fixedly installed on the left side of the inner cavity of the fan (201). A controller (203) is fixedly installed at the rear side of the inner cavity of the box body (1). A temperature detection module (202) is fixedly installed in the middle of the rear side of the inner cavity of the box body (1). A fixing component (4) is arranged on the surface of the box body (1). The fixing component (4) includes a knob (401). The knob (401) is movably connected to the front side of the box body (1). A bidirectional screw rod (402) is fixedly connected to the rear side of the knob (401). Threaded plates (403) are threadedly connected to both the front and rear sides of the surface of the bidirectional screw rod (402). Reinforcing plates (404) are fixedly installed inside both of the threaded plates (403). The twelve reinforcing plates (404) are all attached to the front and rear sides of the six ventilation components (3).

5. A lithium battery pack according to claim 4, characterized in that: A control module (204) and a fan speed regulation module (205) are arranged in the inner cavity of the controller (203). The output end of the temperature detection module (202) is electrically connected to the input end of the control module (204). The output end of the control module (204) is electrically connected to the input end of the fan speed regulation module (205). The output end of the fan speed regulation module (205) is electrically connected to the input end of the fan (201).

6. A lithium battery pack according to claim 4, characterized in that: The thread directions on the front and rear sides of the bidirectional screw (402) are opposite, and the thread pitches on the front and rear sides of the bidirectional screw (402) are the same.

7. A lithium battery pack according to claim 6, characterized in that: Guide rods (405) are fixedly installed on both the left and right sides inside the cavity of the box body (1), and both the left and right sides of the two screw plates (403) are slidably connected to the surfaces of the two guide rods (405).

8. A lithium battery pack according to claim 6, wherein: A fixing bolt (406) is threadedly connected to the surface of the knob (401), and the rear side of the fixing bolt (406) is threadedly connected to the inner surface of the box body (1).

Images