Spiral heat-conducting electrode device for low-temperature lithium battery
Patent Information
- Application Number
- CN202522328611.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-03
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-03
AI Technical Summary
锂电池的性能受温度影响较大，在低温环境下，电池内部的化学反应速率减慢，电解液的离子电导率降低，电极材料的活性下降，限制了锂电池在寒冷地区或低温环境下的应用
风机工作配合加热片将吸入的风加热处理，形成热风吹到输送管以及通气管，通过通气管供输至电极体内部的螺旋风道，热风在螺旋风道内部均匀分布，且热量会通过螺旋导热片传导至电极片内侧完成导热，且电极片外侧会通过螺旋风道内部的热风穿过相变层完成导热，整个螺旋式导热电极装置使得电极导热受热更加均匀，便于电池低温时进行导热处理，提高低温锂电池的充放电效率、容量保持率和寿命，使锂电池在低温条件下仍能保持较好的性能表现。
Smart Images
Figure CN224862301U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of low-temperature lithium batteries, specifically a spiral heat-conducting electrode device for low-temperature lithium batteries. Background Technology
[0002] With the development of technology, lithium batteries have been widely used in electric vehicles, energy storage systems, and portable electronic devices due to their advantages such as high energy density and long cycle life. The performance of lithium batteries is significantly affected by temperature. In low-temperature environments, the internal chemical reaction rate slows down, the ionic conductivity of the electrolyte decreases, and the activity of the electrode materials declines, limiting the application of lithium batteries in cold regions or low-temperature environments. Existing methods to improve the low-temperature performance of lithium batteries mainly include optimizing the electrolyte formulation and using heating devices for external heating of the battery. However, the overall external heating device increases the complexity and cost of the battery system, and uneven heating of the battery electrodes also leads to lower charge-discharge efficiency and capacity retention. Utility Model Content
[0003] The purpose of this invention is to provide a spiral thermally conductive electrode device for low-temperature lithium batteries to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a spiral thermally conductive electrode device for low-temperature lithium batteries, comprising a frame, an electrode body installed inside the frame, a vent pipe extending into the electrode body installed on one side of the frame, a conveying pipe fixedly connected to one end of the vent pipe, an installation box provided on one side of the conveying pipe, a fan fixedly installed inside the installation box, an input pipe connected to the input end of the fan, an output pipe connected to the conveying pipe, a heating element fixedly installed inside the input pipe, the electrode body comprising an electrode sheet and a spiral thermally conductive sheet wound around the inner side of the electrode sheet, the electrode sheet and the spiral thermally conductive sheet spirally surrounding each other, and a spiral air channel provided between each pair of electrode sheets, an active material layer provided on one side of the spiral thermally conductive sheet, the spiral thermally conductive sheet being located between the electrode sheet and the spiral thermally conductive sheet, and a phase change layer provided on the outer side of the electrode sheet.
[0005] Preferably, one side of the spiral heat-conducting sheet is connected to the inner wall of the electrode sheet, the other side of the electrode sheet is connected to the active material layer, one end of the delivery pipe is connected to the interior of the output pipe, the other end of the output pipe is connected to the vent pipe, and one end of the vent pipe extends into the interior of the spiral air duct.
[0006] Preferably, the top of the frame is provided with a dustproof cover, and the top of the mounting box is provided with a top cover for sealing and protecting the top of the mounting box.
[0007] Preferably, a fixing plate is fixedly connected to the bottom of the mounting box, and a mounting bracket is fixedly connected to the bottom of the inner wall of the mounting box. The input pipe extends through the mounting box to the outside, and a filter screen is snapped onto one end of the input pipe. A temperature sensor is installed inside the output pipe to detect the air temperature.
[0008] Compared with the prior art, the beneficial effects of this utility model are: The fan, in conjunction with the heating element, heats the intake air, creating hot air that is blown onto the delivery pipe and ventilation pipe. The hot air is then supplied to the spiral air duct inside the electrode body through the ventilation pipe. The hot air is evenly distributed inside the spiral air duct, and the heat is conducted to the inner side of the electrode plate through the spiral heat-conducting plate. The outer side of the electrode plate is also heated by the hot air passing through the phase change layer inside the spiral air duct. The entire spiral heat-conducting electrode device makes the electrode heat conduction and heating more uniform, which is convenient for heat conduction treatment at low temperatures. This improves the charge and discharge efficiency, capacity retention rate, and lifespan of low-temperature lithium batteries, allowing them to maintain good performance even at low temperatures. Attached Figure Description
[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a top view of the electrode body of this utility model; Figure 3 This is a structural diagram of the electrode sheet and the spiral heat-conducting sheet of this utility model; Figure 4 This is a structural diagram of one side of the electrode sheet of this utility model; Figure 5 This is a diagram showing the internal structure of the mounting box of this utility model.
[0010] In the diagram: 1. Frame; 2. Electrode body; 3. Vent pipe; 4. Delivery pipe; 5. Mounting box; 6. Dustproof cover; 7. Top cover; 8. Fixing plate; 9. Electrode plate; 10. Spiral heat-conducting plate; 11. Spiral air duct; 12. Active material layer; 13. Phase change layer; 14. Fan; 15. Output pipe; 16. Temperature sensor; 17. Input pipe; 18. Heating element; 19. Filter screen; 20. Mounting bracket. Detailed Implementation
[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0012] Please see Figure 1-5 This utility model provides a spiral thermally conductive electrode device for low-temperature lithium batteries, including a frame 1, an electrode body 2 installed inside the frame 1, a vent pipe 3 extending into the electrode body 2 installed on one side of the frame 1, a conveying pipe 4 fixedly connected to one end of the vent pipe 3, an installation box 5 provided on one side of the conveying pipe 4, a fan 14 fixedly installed inside the installation box 5, an input pipe 17 connected to the input end of the fan 14, an output pipe 15 connected to the conveying pipe 4, a heating element 18 fixedly installed inside the input pipe 17, an electrode body 2 including an electrode sheet 9 and a spiral thermally conductive sheet 10 wound around the inner side of the electrode sheet 9, with the electrode sheet 9 and the spiral thermally conductive sheet 10 spirally surrounding each other, and a spiral air channel 11 provided between each two sides of the electrode sheet 9, an active material layer 12 provided on one side of the spiral thermally conductive sheet 10, the spiral thermally conductive sheet 10 being located between the electrode sheet 9 and the spiral thermally conductive sheet 10, and a phase change layer 13 provided on the outer side of the electrode sheet 9.
[0013] See Figure 1-5 One side of the spiral heat-conducting plate 10 is connected to the inner wall of the electrode plate 9, and the other side of the electrode plate 9 is connected to the active material layer 12. One end of the conveying pipe 4 is connected to the inside of the output pipe 15, and the other end of the output pipe 15 is connected to the vent pipe 3. One end of the vent pipe 3 extends into the inside of the spiral air duct 11. The top of the frame 1 is covered with a dustproof cover 6, and the top of the mounting box 5 is covered with a top cover 7. In this embodiment, the mounting box 5 is installed on the outside of the battery. The fan 14 inside the mounting box 5 works and, together with the heating element 18, heats the air drawn in, forming hot air that is blown onto the delivery pipe 4 and the ventilation pipe 3. The hot air is then supplied to the spiral air duct 11 inside the electrode body 2 through the ventilation pipe 3, and the hot air is evenly distributed inside the spiral air duct 11.
[0014] See Figure 1-5 The bottom of the mounting box 5 is fixedly connected to a fixing plate 8, the bottom of the fan 14 is connected to a mounting bracket 20 which is fixedly connected to the bottom of the inner wall of the mounting box 5, the input pipe 17 extends through the mounting box 5 to the outside, one end of the input pipe 17 is snapped with a filter screen 19, and a temperature sensor 16 is installed inside the output pipe 15. In this embodiment, the heat inside the spiral air duct 11 is conducted to the inner side of the electrode sheet 9 through the spiral heat-conducting sheet 10 to complete the heat conduction, and the outer side of the electrode sheet 9 is conducted to the phase change layer 13 through the hot air inside the spiral air duct 11 to complete the heat conduction, so that the electrode heat conduction and heating are more uniform. In this example, the phase change layer 13 is PCM, and the active material layer 12 is LiFePO4 or NCM811.
[0015] In practical use, this utility model provides a spiral heat-conducting electrode device for low-temperature lithium batteries. When the lithium battery is at a low temperature, the electrode body 2 is heated. The mounting box 5 is installed on the outside of the battery. The fan 14 inside the mounting box 5 works, and the heating element 18 heats the drawn-in air, forming hot air that is blown onto the delivery pipe 4 and the ventilation pipe 3. The hot air is supplied to the spiral air duct 11 inside the electrode body 2 through the ventilation pipe 3. The hot air is evenly distributed inside the spiral air duct 11, and the heat is conducted to the inside of the electrode plate 9 through the spiral heat-conducting element 10. The outside of the electrode plate 9 is also heated by the hot air inside the spiral air duct 11 through the phase change layer 13. The entire spiral heat-conducting electrode device makes the electrode heat conduction and heating more uniform, which is convenient for heat conduction treatment when the battery is at a low temperature. This improves the charge and discharge efficiency, capacity retention rate and life of the low-temperature lithium battery, allowing the lithium battery to maintain good performance under low-temperature conditions.
[0016] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A spiral thermally conductive electrode device for low-temperature lithium batteries, comprising a frame (1), characterized in that: An electrode body (2) is installed inside the frame (1). A vent pipe (3) extending into the electrode body (2) is installed on one side of the frame (1). One end of the vent pipe (3) is fixedly connected to a delivery pipe (4). A mounting box (5) is provided on one side of the delivery pipe (4). A fan (14) is fixedly installed inside the mounting box (5). An input pipe (17) is connected to the input end of the fan (14). An output pipe (15) connected to the delivery pipe (4) is connected to the output end of the fan (14). The input pipe (17) The electrode body (2) is fixedly installed with a heating element (18). The electrode body (2) includes an electrode sheet (9) and a spiral heat-conducting sheet (10) wound around the inner side of the electrode sheet (9). The electrode sheet (9) and the spiral heat-conducting sheet (10) are spirally surrounded. A spiral air duct (11) is provided between each two sides of the electrode sheet (9). An active material layer (12) is provided on one side of the spiral heat-conducting sheet (10). The spiral heat-conducting sheet (10) is located between the electrode sheet (9) and the spiral heat-conducting sheet (10). A phase change layer (13) is provided on the outer side of the electrode sheet (9).
2. The spiral thermally conductive electrode device for low-temperature lithium batteries according to claim 1, characterized in that: One side of the spiral heat-conducting plate (10) is connected to the inner wall of the electrode plate (9), and the other side of the electrode plate (9) is connected to the active material layer (12).
3. The spiral thermally conductive electrode device for low-temperature lithium batteries according to claim 1, characterized in that: One end of the delivery pipe (4) is connected to the interior of the output pipe (15), and the other end of the output pipe (15) is connected to the ventilation pipe (3). One end of the ventilation pipe (3) extends into the interior of the spiral air duct (11).
4. The spiral thermally conductive electrode device for low-temperature lithium batteries according to claim 1, characterized in that: The top of the frame (1) is covered with a dustproof cover (6), and the top of the mounting box (5) is covered with a top cover (7).
5. The spiral thermally conductive electrode device for low-temperature lithium batteries according to claim 1, characterized in that: The bottom of the mounting box (5) is fixedly connected to a fixing plate (8), and the bottom of the fan (14) is connected to a mounting bracket (20) that is fixedly connected to the bottom of the inner wall of the mounting box (5).
6. The spiral thermally conductive electrode device for low-temperature lithium batteries according to claim 1, characterized in that: The input tube (17) extends to the outside through the mounting box (5), and a filter screen (19) is snapped onto one end of the input tube (17). A temperature sensor (16) is installed inside the output tube (15).