Lithium iron phosphate battery low-temperature preheating protective sleeve

Abstract

This utility model relates to the technical field of battery low-temperature preheating components, specifically to a low-temperature preheating protective sleeve for lithium iron phosphate batteries. It includes an outer insulation sleeve, a heat-conducting box fixedly installed on the inner wall of the outer insulation sleeve, an inner transverse heat-conducting plate fixedly installed between the left and right side plates of the heat-conducting box, and multiple longitudinal heat-conducting plates fixedly installed between the inner transverse heat-conducting plate and the front and rear side plates of the outer insulation sleeve. A heat-insulating top cover is detachably connected to the top surface of the outer insulation sleeve. Outer insulation boxes are fixedly installed on both the left and right sides of the outer insulation sleeve. A heat-conducting plate with its rear end attached to the side of the heat-conducting box is fixedly installed on the rear side wall of the outer insulation box. A temperature-controlling heating wire is detachably connected inside the outer insulation box, and a cover plate is detachably connected to the outer side of the outer insulation box, protecting the temperature-controlling heating wire inside. This utility model facilitates the installation and removal of the temperature-controlling heating wire, promotes uniform heat transfer, and facilitates the smooth low-temperature preheating of the battery.

Description

Technical Field

[0001] This utility model relates to the technical field of battery low-temperature preheating components, and more specifically, to a low-temperature preheating protective sleeve for lithium iron phosphate batteries. Background Technology

[0002] Lithium iron phosphate (LFP) batteries have been widely used in electric vehicles, energy storage systems, and other fields due to their advantages such as high safety, long cycle life, and environmental friendliness. However, the performance of LFP batteries is greatly affected by temperature, especially in low-temperature environments. At low temperatures, the internal resistance of the battery increases, the battery capacity decays significantly, the charging and discharging efficiency decreases, and there may even be situations where normal charging and discharging cannot occur. This not only limits the application of LFP batteries in cold regions but also affects their performance in winter and other low-temperature seasons. To solve the performance problem of LFP batteries in low-temperature environments, the common method is to install heating devices in the battery pack, such as heating wires or heating films.

[0003] The invention patent with authorization announcement number CN117673574B discloses a lithium battery module with low-temperature preheating function, including an outer frame, an inner frame, a winding chamber, a guide block, a heating element, and a moving component. The inner frame is located in the middle of the outer frame, and the gap between the inner frame and the outer frame forms a thermal power chamber. Multiple temperature sensors are provided on the inner sidewall of the inner frame. The winding chamber is symmetrically installed on both sides of the thermal power chamber. The winding chamber contains a heat-dissipating heating element. This invention solves the problems of existing technologies where some structures can only preheat the battery but cannot reduce heat loss during or after preheating, resulting in low preheating efficiency. Furthermore, while ensuring reduced heat loss during preheating, it cannot simultaneously address battery heat dissipation in high-temperature environments, preventing the battery from maintaining its optimal operating temperature in all environments and reducing battery life.

[0004] While the above-mentioned technical solutions have their respective advantages, most heating devices installed inside lithium iron phosphate batteries also have some shortcomings. On the one hand, traditional heating devices are often directly installed inside the battery pack mounting box. Due to the small internal space and complex structure, the battery pack may obstruct or block the heating device, making installation and maintenance inconvenient. Each time an operation is performed, the battery pack must be disassembled to expose the heating device for inspection and maintenance. This operation is cumbersome and can easily damage the battery.

[0005] On the other hand, during the heating process, since the heating device is directly installed in a specific location and lacks corresponding uniform heat-conducting components, uneven heat distribution will occur, affecting the preheating effect and further impacting the normal use of lithium iron phosphate batteries. Utility Model Content

[0006] The purpose of this invention is to provide a low-temperature preheating protective sleeve for lithium iron phosphate batteries, in order to solve the defects mentioned in the background art, such as the inconvenience of disassembly and assembly of most heating devices and the uneven heat distribution.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A low-temperature preheating protection sleeve for lithium iron phosphate batteries includes an outer insulation sleeve. A heat-conducting box is fixedly installed on the inner wall of the outer insulation sleeve. An inner transverse heat-conducting plate is fixedly installed between the left and right side plates of the heat-conducting box. Multiple longitudinal heat-conducting plates are fixedly installed between the inner transverse heat-conducting plate and the front and rear side plates of the outer insulation sleeve. An insulated top cover is detachably connected to the top surface of the outer insulation sleeve. An outer insulation box is fixedly installed on both the left and right side surfaces of the outer insulation sleeve. A heat conduction plate with its rear end attached to the side of the heat-conducting box is fixedly installed on the rear side wall of the outer insulation box. A temperature-controlling heating wire is detachably connected inside the outer insulation box. A cover plate is detachably connected to the outer side surface of the outer insulation box, and the cover plate protects the temperature-controlling heating wire inside.

[0009] Preferably, the height of both the inner transverse heat-conducting plate and the longitudinal heat-conducting plate is less than the depth of the heat-conducting box, and the distance between the top surface of the inner transverse heat-conducting plate and the longitudinal heat-conducting plate and the top surface of the heat-conducting box is between 3cm and 6cm.

[0010] The above configuration allows for ventilation space above the inner horizontal and vertical heat-conducting plates, which promotes airflow and provides a channel for airflow during both preheating and heat dissipation.

[0011] Preferably, the top surface of the inner transverse heat-conducting plate is provided with a plurality of first wiring holes, and the top surface of the longitudinal heat-conducting plate is provided with a second wiring hole, wherein the cross-section of the first wiring hole and the second wiring hole is arc-shaped;

[0012] The first and second wiring holes described above allow cables to pass through for wiring operations, and the arc-shaped structure matches the contour of the cable, which can reduce wear on the cable.

[0013] Preferably, a temperature sensor is fixedly installed on the inner wall of the heat conduction box, and two symmetrical wire holes are provided on the heat-insulating top cover.

[0014] This feature allows the use of a temperature sensor to detect temperature, and the wire hole is used for internal cables to pass through for wiring operations.

[0015] Preferably, a ventilation pipe is fixedly installed on the insulated top cover, a fan is fixedly installed on the pipe wall of the ventilation pipe, and an electric valve is also fixedly installed on the ventilation pipe;

[0016] The above settings enable the electric valve to open and the fan to work to dissipate heat when the temperature is too high.

[0017] Preferably, a rectangular frame in the shape of a rectangular ring is fixedly installed on the inner wall of the outer insulation box, and a rectangular frame is fixedly installed on the temperature control heating wire. The rectangular frame is fixedly installed on the front side of the rectangular frame by a plurality of fastening screws.

[0018] The above settings enable convenient installation and easy disassembly for maintenance of the temperature-controlled heating wire.

[0019] Preferably, a cable hole is provided on one inner wall of the outer insulation box, and a cable protection sleeve is fixedly installed on the cover plate at the position corresponding to the cable hole, and the cable protection sleeve is inserted into the cable hole.

[0020] The above setup facilitates the rational arrangement of cables by routing the cables on the temperature-controlled heating wire through the cable hole and passing them out through the cable protective sleeve.

[0021] Preferably, two symmetrical and horizontally arranged guide posts are fixedly installed on the front side of the top plate of the outer insulation box, and two symmetrical guide holes are provided on the top plate of the cover plate. The guide posts are located in the guide holes and are inserted into the guide holes.

[0022] This setting enables the cover plate to be guided and positioned, ensuring precise alignment during installation.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. This utility model achieves uniform heat conduction by setting an outer heat insulation sleeve, a heat conduction box, and an inner transverse heat conduction plate and a longitudinal heat conduction plate to form a heat conduction structure, which is combined with a temperature-controlled heating wire to heat the battery. This avoids local overheating or uneven preheating of the battery, thereby improving the preheating effect and performance of the lithium iron phosphate battery.

[0025] 2. This utility model achieves convenient disassembly and assembly of the temperature-controlling heating wire by installing it inside the external insulation box and using a rectangular frame and a rectangular frame to fix it with fastening screws. It allows for maintenance without disassembling the battery pack, thus simplifying maintenance operations and reducing the risk of battery damage.

[0026] 3. This utility model achieves active heat dissipation when the temperature is too high by setting ventilation pipes, fans and electric valves on the heat-insulating top cover, and reserving ventilation space above the inner horizontal heat-conducting plate and the vertical heat-conducting plate. Combined with the heat-conducting structure to promote air flow, it can ensure that the battery can operate stably under different temperature environments and extend the battery life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0029] Figure 3 This is one of the partial structural schematic diagrams of this utility model;

[0030] Figure 4 This is a second schematic diagram of a partial structure of this utility model;

[0031] The meanings of the labels in the diagram are as follows:

[0032] 1. Outer insulation jacket; 10. Heat conduction box; 11. Inner transverse heat conduction plate; 111. First wiring hole; 12. Longitudinal heat conduction plate; 121. Second wiring hole; 13. Temperature sensor; 14. Insulated top cover; 141. Wiring hole; 15. Ventilation duct; 151. Fan; 152. Electric valve;

[0033] 2. External insulation box; 20. Heat transfer plate; 21. Rectangular frame; 22. Cable hole; 23. Guide post; 24. Rectangular frame; 241. Temperature control heating wire; 25. Cover plate; 251. Guide hole; 26. Cable protection sleeve. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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.

[0035] Please see Figures 1-4This utility model provides a technical solution: a low-temperature preheating protective sleeve for lithium iron phosphate batteries, including an outer insulation sleeve 1. A heat-conducting box 10 is fixedly installed on the inner wall of the outer insulation sleeve 1. An inner transverse heat-conducting plate 11 is fixedly installed between the left and right side plates of the heat-conducting box 10. Multiple longitudinal heat-conducting plates 12 are fixedly installed between the inner transverse heat-conducting plate 11 and the front and rear side plates of the outer insulation sleeve 1. A heat-insulating top cover 14 is detachably connected to the top surface of the outer insulation sleeve 1. The height of the inner transverse heat-conducting plate 11 and the longitudinal heat-conducting plates 12 is less than the depth of the heat-conducting box 10. The distance between the top surface of the heat-conducting plate 12 and the top surface of the heat-conducting box 10 is between 3cm and 6cm, which allows for ventilation space above the inner horizontal heat-conducting plate 11 and the vertical heat-conducting plate 12. This promotes airflow and provides a channel for airflow during both preheating and heat dissipation. In addition, the outer insulation sleeve 1 provides overall protection and heat preservation, the heat-conducting box 10 concentrates heat, and the inner horizontal heat-conducting plate 11 and the vertical heat-conducting plate 12 form a heat-conducting network, which enables heat to be evenly conducted to all parts of the battery, avoiding local overheating or insufficient preheating, and effectively improving the battery preheating effect and performance.

[0036] In this embodiment, as Figures 1-3 As shown, an outer insulation box 2 is fixedly installed on both the left and right sides of the outer insulation sleeve 1. A heat conduction plate 20 with its rear end attached to the side of the heat conduction box 10 is fixedly installed on the rear side wall of the outer insulation box 2, so that the heat conduction plate 20 can transfer heat to the heat conduction box 10, the inner transverse heat conduction plate 11 and the longitudinal heat conduction plate 12. A rectangular frame 21 in the shape of a rectangular ring is fixedly installed on the inner wall of the outer insulation box 2. A temperature control heating wire 241 is detachably connected inside the outer insulation box 2. The outer side of the outer insulation box 2... A cover plate 25 is detachably connected to the upper part, which protects the temperature-controlled heating wire 241 inside. A rectangular frame 24 is fixedly installed on the temperature-controlled heating wire 241. The rectangular frame 24 is fixedly installed on the front side of the rectangular frame 21 by multiple fastening screws. By installing the temperature-controlled heating wire 241 inside the outer insulation box 2, and with the rectangular frame 21, the rectangular frame 24 and the fastening screws, the temperature-controlled heating wire 241 can be independently installed and removed, and can be inspected without disassembling the battery pack, simplifying the maintenance process.

[0037] like Figure 3 As shown, two symmetrical guide posts 23, both horizontally arranged, are fixedly installed on the front side of the top plate of the outer insulation box 2. Two symmetrical guide holes 251 are provided on the top plate of the cover plate 25. The guide posts 23 are located in the guide holes 251 and are inserted into the guide holes 251 to realize the guiding and positioning operation of the cover plate 25. This allows the cover plate 25 to be accurately aligned during installation, improving the efficiency of disassembly and assembly and reducing the operational risk.

[0038] Specifically, such as Figure 2As shown, the top surface of the inner transverse heat-conducting plate 11 is provided with a plurality of first wiring holes 111, and the top surface of the longitudinal heat-conducting plate 12 is provided with a second wiring hole 121. The cross-sections of the first wiring holes 111 and the second wiring holes 121 are both arc-shaped. The first wiring holes 111 and the second wiring holes 121 can allow cables to pass through for wiring operations, and the arc-shaped structure is adapted to the contour of the cable, which can reduce wear on the cable.

[0039] like Figure 1 and Figure 2 As shown, the heat-insulating top cover 14 is provided with two symmetrical wire holes 141 on the left and right sides. The wire holes 141 are used for internal cables to pass out for wiring operations. A cable hole 22 is provided on one side of the inner wall of the outer heat-insulating box 2. A cable protection sleeve 26 is fixedly installed on the cover plate 25 at the position corresponding to the cable hole 22. The cable protection sleeve 26 is inserted into the cable hole 22. The depth of the cable protection sleeve 26 is less than the depth of the cable hole 22, so that the cable on the temperature control heating wire 241 is arranged from the cable hole 22 and passes out from the cable protection sleeve 26, which is conducive to the reasonable arrangement of the cable.

[0040] In addition, such as Figure 1 and Figure 2 As shown, a ventilation pipe 15 is fixedly installed on the insulated top cover 14, a fan 151 is fixedly installed on the pipe wall of the ventilation pipe 15, and an electric valve 152 is also fixedly installed on the ventilation pipe 15, so that when the temperature is too high, the electric valve 152 opens and the fan 151 works to dissipate heat.

[0041] It is worth noting that, such as Figure 2 As shown, a temperature sensor 13 is fixedly installed on the inner wall of the heat conduction box 10. The temperature sensor 13 is electrically connected to the central control host in the vehicle. The temperature sensor 13 is used to monitor the temperature in real time. When the temperature is too high, the central control host in the vehicle can control the temperature control heating wire 241, the electric valve 152 and the fan 151 to work and perform reasonable heat dissipation.

[0042] Finally, it should be noted that the temperature-controlled heating wire 241, electric valve 152, fan 151, vehicle central control unit, and vehicle power supply involved in this utility model are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the spare parts of this device, all the above-mentioned electrical components, which refer to power elements, electrical components, and adapted controllers and power supplies, are connected by wires. The specific connection method should refer to the working principle of this utility model. The electrical connections between each electrical component are completed in the order of operation. The detailed connection methods are all technologies known in the art.

[0043] When using the low-temperature preheating protective cover for lithium iron phosphate batteries of this utility model, the overall encapsulation is completed by the detachable connection between the heat insulation top cover 14 and the top surface of the outer heat insulation cover 1. The rectangular frame 24 of the temperature control heating wire 241 is fixed to the rectangular frame 21 inside the outer heat insulation box 2 by fastening screws. The guide post 23 is inserted into the guide hole 251 of the cover plate 25 to complete the guidance of the cover plate 25, thereby protecting the temperature control heating wire 241 inside.

[0044] In low-temperature environments, the temperature-controlled heating wire 241 generates heat, which is then transferred to the heat-conducting box 10 via the heat conduction plate 20. The heat is then evenly conducted to the battery by the network formed by the inner transverse heat-conducting plate 11 and the longitudinal heat-conducting plate 12.

[0045] During operation, the temperature sensor 13 on the inner wall of the heat transfer box 10 monitors the temperature in real time and feeds it back to the vehicle's central control unit. When the temperature is too high, the central control unit controls the electric valve 152 of the ventilation pipe 15 to open and the fan 151 to start, achieving efficient heat dissipation and ensuring stable battery operation.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A low-temperature preheating protection sleeve for lithium iron phosphate batteries, comprising an outer thermal insulation sleeve (1), characterized in that: A heat-conducting box (10) is fixedly installed on the inner wall of the outer insulation sleeve (1). An inner transverse heat-conducting plate (11) is fixedly installed between the left and right side plates of the heat-conducting box (10). Multiple longitudinal heat-conducting plates (12) are fixedly installed between the inner transverse heat-conducting plate (11) and the front and rear side plates of the outer insulation sleeve (1). A heat-insulating top cover (14) is detachably connected to the top surface of the outer insulation sleeve (1). An outer insulation box (2) is fixedly installed on both the left and right sides of the outer insulation sleeve (1). A heat-conducting plate (20) with its rear end attached to the side of the heat-conducting box (10) is fixedly installed on the rear side wall of the outer insulation box (2). A temperature-controlling heating wire (241) is detachably connected inside the outer insulation box (2). A cover plate (25) is detachably connected to the outer side surface of the outer insulation box (2). The cover plate (25) protects the temperature-controlling heating wire (241) inside.

2. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 1, characterized in that: The height of the inner transverse heat-conducting plate (11) and the longitudinal heat-conducting plate (12) are both less than the depth of the heat-conducting box (10). The distance between the top surface of the inner transverse heat-conducting plate (11) and the longitudinal heat-conducting plate (12) and the top surface of the heat-conducting box (10) is between 3cm and 6cm.

3. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 1, characterized in that: The top surface of the inner transverse heat-conducting plate (11) is provided with a plurality of first wiring holes (111), and the top surface of the longitudinal heat-conducting plate (12) is provided with a second wiring hole (121). The cross-sections of the first wiring hole (111) and the second wiring hole (121) are both arc-shaped.

4. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 1, characterized in that: A temperature sensor (13) is fixedly installed on the inner wall of the heat-conducting box (10), and two symmetrical wire holes (141) are provided on the heat-insulating top cover (14).

5. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 1, characterized in that: A ventilation pipe (15) is fixedly installed on the heat-insulating top cover (14), a fan (151) is fixedly installed on the pipe wall of the ventilation pipe (15), and an electric valve (152) is also fixedly installed on the ventilation pipe (15).

6. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 1, characterized in that: A rectangular frame (21) in the shape of a rectangular ring is fixedly installed on the inner wall of the outer insulation box (2), and a rectangular frame (24) is fixedly installed on the temperature control heating wire (241). The rectangular frame (24) is fixedly installed on the front side of the rectangular frame (21) by multiple fastening screws.

7. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 6, characterized in that: A cable hole (22) is provided on one side of the inner wall of the outer insulation box (2). A cable protection sleeve (26) is fixedly installed on the cover plate (25) at the position corresponding to the cable hole (22). The cable protection sleeve (26) is inserted into the cable hole (22).

8. The low-temperature preheating protective sleeve for lithium iron phosphate batteries according to claim 7, characterized in that: The top plate of the outer insulation box (2) is fixedly installed with two symmetrical guide posts (23) arranged horizontally on the left and right sides. The top plate of the cover plate (25) is provided with two symmetrical guide holes (251). The guide posts (23) are located in the guide holes (251) and are inserted into the guide holes (251).

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