Cylindrical battery heating device and system

Abstract

This application provides a cylindrical battery heating device and system, relating to the field of cylindrical battery pack technology, for heating cylindrical batteries. It includes: two fixing seats, each with a mounting through-hole in its center, through which the fixing seats are fitted onto the ends of the cylindrical battery; a connecting nickel sheet disposed inside the fixing seats and electrically connected to an external power source; and two heating films with arc-shaped cross-sections, symmetrically covering the outer periphery of the cylindrical battery and extending along the axial direction of the battery. The two ends of each heating film are inserted into the mounting through-holes of the two fixing seats and connected to the connecting nickel sheet. This cylindrical battery heating device and system can heat and maintain the temperature of cylindrical batteries, providing uniform overall temperature distribution and effective contact between the heating films and the cylindrical battery, preventing the heating films from dry-burning.

Description

Technical Field

[0001] This application relates to the field of cylindrical battery pack technology, and in particular to a cylindrical battery heating device and system. Background Technology

[0002] Some goods require storage in cryogenic warehouses to maintain their quality. Handling vehicles used in cryogenic warehouses, such as pallet trucks and forklifts, sometimes use new energy batteries, specifically lithium batteries. However, the minimum operating temperature for lithium batteries is -20°C, while the temperature in cryogenic warehouses can drop below -20°C. Prolonged use in such low-temperature environments can cause battery malfunctions in handling vehicles using lithium batteries. For example, the low temperature can cause short circuits, and the electrolyte can crystallize at low temperatures, puncturing the separator between the positive and negative electrodes and causing a short circuit. Therefore, heating the batteries is necessary.

[0003] Currently, some lithium batteries are cylindrical. Due to their unique shape, the sides and bottom of cylindrical batteries are not flat, making it difficult to find effective heating solutions for either the dispensing or bracketing processes. Furthermore, when cylindrical batteries are arranged side-by-side and covered with a heating film, gaps appear between the heating film at the contact points between two batteries. This results in uneven heating of the cylindrical batteries, and the heating film in these gaps does not make effective contact with the battery, meaning it lacks contact with the load. Prolonged heating can lead to dry burning of the heating film, causing it to age prematurely. This can easily lead to safety hazards such as short circuits and thermal runaway. Utility Model Content

[0004] The purpose of this application is to address the above problems by providing a cylindrical battery heating device and system that can heat and keep cylindrical batteries warm, with uniform overall heating temperature distribution and effective adhesion of the heating film to the cylindrical battery, thus preventing the heating film from burning dry.

[0005] In a first aspect, this application provides a cylindrical battery heating device for heating a cylindrical battery, comprising: two fixing seats, each fixing seat having a mounting through hole in its middle, the fixing seat being sleeved on the end of the cylindrical battery through the mounting through hole; a connecting nickel sheet disposed inside the fixing seat and electrically connected to an external power source; and two heating films, each heating film having an arc-shaped cross-section, the two heating films symmetrically covering the outer peripheral surface of the cylindrical battery, and both heating films extending along the axial direction of the cylindrical battery, the two ends of the heating films being respectively inserted into the mounting through holes of the two fixing seats and connected to the connecting nickel sheet.

[0006] According to the technical solutions provided in certain embodiments of this application, the connecting nickel sheet is arc-shaped, and the arc-shaped ends of the connecting nickel sheet have bent connecting feet.

[0007] According to the technical solutions provided in certain embodiments of this application, the side wall of the fixing base is provided with a connecting hole that communicates with the assembly through hole. The position of the connecting hole corresponds to the position of the connecting foot, so that the connecting foot can extend out of the connecting hole and extend in a direction away from the cylindrical battery.

[0008] According to the technical solutions provided in certain embodiments of this application, metal contacts are provided at both ends of the outer surface of the heating film, and the metal contacts are connected to the connecting nickel sheet through the connecting hole.

[0009] According to the technical solutions provided in certain embodiments of this application, the fixing seat has four spaced-apart abutment portions, each abutment portion covering at least part of the area of ​​the mounting through hole, so that when the fixing seat is sleeved on the end of the cylindrical battery, the abutment portion can abut against the end face of the cylindrical battery and the end face of the heating film.

[0010] According to the technical solutions provided in certain embodiments of this application, the inner wall of the assembly through hole is provided with an assembly groove extending along its axial direction, and the assembly groove allows the end of the heating film to be inserted.

[0011] According to the technical solutions provided in certain embodiments of this application, the two outer side walls of the fixing base are provided with sliding protrusions extending along the axial direction of the cylindrical battery, and the two outer side walls of the fixing base without the sliding protrusions are provided with sliding grooves extending along the axial direction of the cylindrical battery, and the sliding protrusions can be slidably connected with the sliding grooves.

[0012] According to the technical solutions provided in certain embodiments of this application, the projections of the sliding protrusion and the sliding groove on a plane perpendicular to the axial direction of the cylindrical battery are both trapezoidal, and the upper base of the trapezoid is connected to the outer wall of the fixing seat.

[0013] Secondly, this application provides a cylindrical battery heating system, wherein the cylindrical battery heating system is electrically connected to an external power source through the connecting pin of the connecting nickel sheet, and includes: a plurality of cylindrical battery heating devices, wherein the cylindrical battery heating devices are any of the cylindrical battery heating devices described in the first aspect above, the plurality of cylindrical battery heating devices are slidably connected to the sliding groove through the sliding protrusion, and the plurality of cylindrical battery heating devices are electrically connected to each other through the connecting pin of the connecting nickel sheet.

[0014] According to the technical solutions provided in certain embodiments of this application, the cylindrical battery heating system further includes: a nickel electrode sheet, wherein the nickel electrode sheet electrically connects a plurality of cylindrical batteries through the assembly through hole.

[0015] Compared with existing technologies, the advantages of this application are as follows: The cylindrical battery is fixed in position by having two mounting brackets respectively fitted onto both ends; and the cylindrical battery is uniformly heated by two symmetrical heating films covering it, ensuring uniform temperature distribution. Furthermore, the connection method between the two ends of the heating films and the connecting nickel sheets reduces the complexity of the overall circuit layout. Using two heating films that at least partially cover the outer surface of the cylindrical battery ensures effective connection between the heating films and the battery, meaning each heating film has an effective load, preventing damage and safety hazards caused by dry burning of the heating films.

[0016] It should be understood that the descriptions of technical features, technical solutions, beneficial effects, or similar language in this application do not imply that all features and advantages can be achieved in any single embodiment. Rather, it is understood that the description of a feature or beneficial effect means that a specific technical feature, technical solution, or beneficial effect is included in at least one embodiment. Therefore, the descriptions of technical features, technical solutions, or beneficial effects in this specification do not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions, and beneficial effects described in this embodiment can be combined in any suitable manner. Those skilled in the art will understand that embodiments can be implemented without one or more specific technical features, technical solutions, or beneficial effects of a particular embodiment. In other embodiments, additional technical features and beneficial effects may be identified in specific embodiments that do not embody all embodiments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural schematic diagram of a cylindrical battery heating device provided in the first aspect embodiment of this application; Figure 2 An exploded perspective view of a cylindrical battery heating device provided in the first aspect of this application; Figure 3 A three-dimensional structural diagram of a mounting base for a cylindrical battery heating device provided in the first aspect of this application; Figure 4 A three-dimensional structural diagram of a mounting base for a cylindrical battery heating device provided in the first aspect of this application, from another angle; Figure 5A three-dimensional structural schematic diagram of the connecting nickel sheet of a cylindrical battery heating device provided in the first aspect embodiment of this application; Figure 6 for Figure 1 Enlarged view of a portion of point A in the middle; Figure 7 A three-dimensional structural schematic diagram of the heating film of a cylindrical battery heating device provided in the first aspect embodiment of this application; Figure 8 A three-dimensional structural schematic diagram of a cylindrical battery heating system provided in the second aspect of this application; Figure 9 This is a three-dimensional structural diagram of a cylindrical battery heating system provided in the second aspect of this application.

[0019] The text labels in the image represent: 1000. Cylindrical battery heating system; 100. Cylindrical battery heating device; 10. Fixture; 101. Assembly through hole; 102. Connecting hole; 103. Abutment part; 104. Assembly slot; 105. Sliding protrusion; 106. Sliding groove; 20. Connecting nickel plate; 201. Connecting pin; 30. Heating film; 301. Metal contacts; 200, nickel electrode sheet; 300, circuit board; 2000, cylindrical battery. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The descriptions in this section are merely illustrative and explanatory, and should not be construed as limiting the scope of protection of this application. Specifically, the described embodiments are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort should fall within the scope of protection of this application.

[0021] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such process, method, product, or apparatus.

[0022] As mentioned in the background section, some goods need to be stored in cryogenic warehouses to maintain their quality. Handling vehicles used in cryogenic warehouses, such as pallet trucks and forklifts, sometimes use new energy batteries, specifically lithium batteries. However, the minimum operating temperature for lithium batteries is -20°C, while the temperature in cryogenic warehouses can drop below -20°C. Prolonged use in such low-temperature environments can cause battery malfunctions in handling vehicles using lithium batteries. For example, the low temperature may cause short circuits, and the electrolyte may crystallize at low temperatures, puncturing the separator between the positive and negative electrodes, leading to a short circuit. Therefore, it is necessary to heat the battery.

[0023] Currently, some lithium batteries are cylindrical. Due to their unique shape, the sides and bottom of cylindrical batteries are not flat, making it difficult to find effective heating solutions for either the dispensing or bracketing processes. Furthermore, when cylindrical batteries are arranged side-by-side and covered with a heating film, gaps appear between the heating film at the contact points between two batteries. This results in uneven heating of the cylindrical batteries, and the heating film in these gaps does not make effective contact with the battery, meaning it lacks contact with the load. Prolonged heating can lead to dry burning of the heating film, causing it to age prematurely. This can easily lead to safety hazards such as short circuits and thermal runaway.

[0024] To address the problems in the prior art, this application proposes a cylindrical battery heating device 100 and a system 1000. The following description, in conjunction with the appendix to the specification, will be provided. Figures 1-7 A cylindrical battery heating device 100 according to the first aspect of this application is described in detail.

[0025] like Figure 2 As shown, this embodiment provides a cylindrical battery heating device 100 for heating a cylindrical battery 2000, including a connecting nickel sheet 20, two fixing seats 10 and two heating films 30.

[0026] Specifically, such as Figure 1 and Figure 2As shown, the mounting base 10 has a mounting through hole 101 in the middle, and the mounting base 10 is sleeved on the end of the cylindrical battery 2000 through the mounting through hole 101. By having two mounting bases 10 respectively sleeved on both ends of the cylindrical battery 2000, a stable limit can be formed on the position of the cylindrical battery 2000, which facilitates the subsequent placement of the cylindrical battery 2000.

[0027] like Figure 2 and Figure 5 As shown, the connecting nickel plate 20 is located inside the mounting base 10 and is electrically connected to an external power source. The metal material of the connecting nickel plate 20 serves as a conductive structure, allowing the circuitry of the external power source to be supplied to the cylindrical heating device, i.e., energizing the heating film 30 to achieve the heating function. A cylindrical battery heating device 100 has two mounting bases 10, therefore each mounting base 10 contains a connecting nickel plate 20. For example... Figure 1 In the middle, the connecting nickel sheet 20 is not shown. It is located inside the fixing base 10. The fixing base 10 protects the connecting nickel sheet 20 and prevents it from being exposed to the outside for a long time and causing damage.

[0028] Furthermore, such as Figure 2 and Figure 7 As shown, the heating film 30 has an arc-shaped cross-section, allowing it to be assembled along the curvature of the mounting through-hole 101 of the mounting base 10. Two heating films 30 symmetrically cover the outer peripheral surface of the cylindrical battery 2000, and both heating films 30 extend along the axial direction of the cylindrical battery 2000, i.e. Figure 1 and Figure 2 As shown in the diagram. The axial direction of the cylindrical battery 2000 is as follows. Figure 2 The extension direction is shown by the central axis L1. The heating film 30 can cover the outer circumferential surface of the cylindrical battery 2000 along its length, and through a symmetrical arrangement, it can heat the cylindrical battery 2000 on both axial sides, thereby ensuring uniform temperature distribution during heating. This also reduces the difficulty of arranging the wiring 300 in the overall structure. Furthermore, using two heating films 30 symmetrically covering the outer circumferential surface of the cylindrical battery 2000 ensures that both heating films 30 are effectively connected to the cylindrical battery 2000, meaning both heating films 30 have effective load capacity, preventing damage and safety hazards caused by dry burning of the heating films 30. like Figure 1 and Figure 2 As shown, the two ends of the heating film 30 are respectively inserted into the assembly through holes 101 of the two fixing seats 10, so that the heating film 30 can maintain a stable position with the cylindrical battery 2000 and be connected to the connecting nickel sheet 20, and power is supplied through the connecting nickel sheet 20.

[0029] According to the first aspect of this application, a cylindrical battery heating device 100 can fix the position of the cylindrical battery 2000 by means of two fixing seats 10 respectively sleeved on both ends of the cylindrical battery 2000, and by means of two heating films 30 symmetrically covering the cylindrical battery 2000, uniform heating of the cylindrical battery 2000 can be achieved, ensuring uniform temperature distribution. In addition, the connection form between the two ends of the two heating films 30 and the connecting nickel sheet 20 can reduce the difficulty of the overall circuit layout 300. Using two heating films 30 to at least partially cover the outer peripheral surface of the cylindrical battery 2000 can ensure that the heating films 30 are effectively connected to the cylindrical battery 2000, that is, the heating films 30 have effective load, preventing damage and safety hazards caused by dry burning of the heating films 30.

[0030] In some embodiments of this application, the heating film 30 can be bonded to the outer peripheral surface of the cylindrical battery 2000 with 3M adhesive to ensure that the position between the heating film 30 and the cylindrical battery 2000 is stable and that the heating film 30 can stably heat the cylindrical battery 2000.

[0031] In some embodiments of this application, such as Figure 5 As shown, the connecting nickel plate 20 is arc-shaped, and both ends of the arc-shaped connecting nickel plate 20 have bent connecting feet 201. The arc-shaped design of the connecting nickel plate 20 allows it to fit the shape of the circular mounting through hole 101. The bent structure at both ends of the connecting feet 201 facilitates electrical connection with an external power source. At the same time, when multiple cylindrical battery 2000 devices are assembled in series or parallel, electrical connection can be achieved by the abutting between the connecting feet 201.

[0032] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the side wall of the fixing base 10 has a connecting hole 102 that communicates with the assembly through hole 101. For example... Figure 6 As shown, the position of the connecting hole 102 corresponds to the position of the connecting foot 201, allowing the connecting foot 201 to extend out of the connecting hole 102 and in a direction away from the cylindrical battery 2000. That is, the connecting foot 201 extends outward from the connecting hole 102. This allows for electrical connection through the contact between the connecting feet 201 when multiple cylindrical battery 2000 fixing devices are connected. It is convenient, quick, space-saving, and has a compact structure.

[0033] In some embodiments of this application, such as Figure 7As shown, metal contacts 301 are provided at both ends of the outer surface of the heating film 30. The outer surface of the heating film 30 is the surface that faces away from the cylindrical battery 2000, or in other words, it is not connected to the surface of the cylindrical battery 2000. As mentioned above, the connecting hole 102 communicates with the mounting through hole 101. Therefore, when the end of the heating film 30 is connected to the fixing base 10, the metal contacts 301 of the heating film 30 can connect to the connecting nickel plate 20 located at the connecting hole 102 through the communicating hole, thereby connecting the external power supply to the heating film 30 through the connecting nickel plate 20 to realize the heating function. By connecting the metal contacts 301 to the heating wire inside the heating film 30, the compactness of the heating film 30 can be ensured. The metal contacts 301 are connected to the connecting nickel plate 20 through the connecting hole 102. Compared with the existing method of connecting the heating wire of the heating film to the outside through a wire, the wiring difficulty is reduced and the connection with the connecting nickel plate 20 is facilitated.

[0034] In some embodiments of this application, the metal contact 301 can also be a nickel contact. Nickel has good conductivity, solderability, connection stability, chemical stability and corrosion resistance. Therefore, using nickel contacts is easy to weld, the operation process is mature, and the service life is long, reducing the later maintenance cost.

[0035] like Figure 3 and Figure 4 As shown, the mounting base 10 has four spaced-apart abutment portions 103, each abutment portion 103 covering at least a portion of the area of ​​the mounting through hole 101. Specifically, the abutment portions 103 extend from the mounting base 10 toward the area of ​​the mounting through hole 101 and cover that area. When the mounting base 10 is fitted onto the end of the cylindrical battery 2000, the abutment portions 103 can abut against the end face of the cylindrical battery 2000 and the end face of the heating film 30. Thus, when two mounting bases 10 are fitted onto both ends of the cylindrical battery 2000, the abutment portions 103 can abut against the end face of the cylindrical battery 2000, stabilizing the position of the cylindrical battery 2000 and preventing it from slipping off from the mounting through hole 101 of the mounting base 10. Correspondingly, the abutment portions 103 can limit the position of the heating film 30, ensuring stable positioning between the heating film 30 and the cylindrical battery 2000, and also ensuring stable heating function.

[0036] In some embodiments of this application, the fixing base 10 is a rectangular fixing base with a mounting through hole 101 in the middle and abutment portions 103 at each of its four apex positions. This allows the cylindrical battery 2000 to be limited by the abutment portions 103 against the end face of the cylindrical battery 2000 when it is sleeved on the end of the cylindrical battery 2000.

[0037] In some embodiments of this application, such as Figure 4As shown, the inner wall of the mounting through hole 101 has a mounting groove 104 extending along its axial direction. As mentioned above, the mounting through hole 101 is fitted onto the end of the cylindrical battery 2000, therefore its axis coincides with the axis of the cylindrical battery 2000. Figure 2 As shown in the diagram, L1. Therefore, it can be seen that the mounting slot 104 is opened along the axial direction, and the mounting slot 104 allows the end of the heating film 30 to be inserted. Thus, the position of the heating film 30 can be fixed at both ends of the heating film 30 by the fixing seat 10.

[0038] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the two outer sidewalls of the fixing base 10 are provided with sliding protrusions 105 extending along the axial direction of the cylindrical battery 2000, and the two outer sidewalls of the fixing base 10 without sliding protrusions 105 are provided with sliding grooves 106 extending along the axial direction of the cylindrical battery 2000. In other words, the fixing base 10 has four sidewalls, two sidewalls of the fixing base 10 are provided with sliding protrusions 105, and the other two sidewalls are provided with sliding grooves 106. The sliding protrusions 105 can be slidably connected with the sliding grooves 106, so that when multiple cylindrical battery heating devices 100 are connected, the connection between the sliding protrusions 105 and the sliding grooves 106 can be conveniently and quickly achieved.

[0039] Furthermore, such as Figure 3 and Figure 4 As shown, a single sidewall of the fixing base 10 is provided with two sliding protrusions 105 and two sliding grooves 106. Therefore, when multiple cylindrical battery heating devices 100 are connected, the two sliding protrusions 105 and the two sliding grooves 106 can slide and engage simultaneously to ensure assembly accuracy and prevent disengagement after connection.

[0040] In some embodiments of this application, such as Figure 4 As shown, the projections of the sliding protrusion 105 and the sliding groove 106 onto a plane perpendicular to the axial direction of the cylindrical battery 2000 are both trapezoidal, with the upper base of the trapezoid connected to the outer wall of the fixing seat 10. Therefore, the side of the sliding protrusion 105 that mates with the sliding groove 106 is longer than the side connecting the sliding protrusion 105 to the side wall of the fixing seat 10. Thus, after sliding assembly between the trapezoidal protrusion and the trapezoidal groove, they can be locked to prevent the two fixing seats 10 from separating laterally after connection.

[0041] According to the second aspect of this application, a cylindrical battery heating system 1000 is provided, such as... Figure 8 and Figure 9 As shown, the cylindrical battery heating system 1000 is electrically connected to an external power source via the connecting pin 201 of the connecting nickel plate 20, specifically as follows: Figure 9As shown, the outermost cylindrical battery heating device 100 of the cylindrical battery heating system 1000 is connected to an external power source via a line 300 through a connecting pin 201. The cylindrical battery heating system 1000 includes multiple cylindrical battery heating devices 100, which are cylindrical battery heating devices 100 according to any embodiment of the first aspect described above. The multiple cylindrical battery heating devices 100 are slidably connected to the sliding groove 106 through sliding protrusions 105, and the multiple cylindrical battery heating devices 100 are electrically connected to each other through the connecting pin 201 of the connecting nickel sheet 20.

[0042] According to a second aspect of this application, a cylindrical battery heating system 1000, having the cylindrical battery heating device 100 of the first aspect described above, has the same beneficial effects as the cylindrical battery heating device 100 of the first aspect. The cylindrical battery 2000 can be fixed in position by two fixing seats 10 respectively fitted onto both ends of the cylindrical battery 2000, and uniform heating of the cylindrical battery 2000 can be achieved by two symmetrical heating films 30 covering the cylindrical battery 2000, ensuring uniform temperature distribution. Furthermore, the form of two heating films 30 reduces the complexity of the overall circuit layout 300. Using two heating films 30 that at least partially cover the outer peripheral surface of the cylindrical battery 2000 ensures that both heating films 30 are effectively connected to the cylindrical battery 2000, i.e., both heating films 30 have effective load, preventing damage and safety hazards caused by dry burning of the heating films 30.

[0043] In some embodiments of this application, such as Figure 8 and Figure 9 As shown, the cylindrical battery heating system 1000 also includes: a nickel electrode sheet 200, which electrically connects multiple cylindrical batteries 2000 through mounting through holes 101. This enables the electrical connection of the cylindrical batteries 2000 of the multiple cylindrical battery heating devices 100 in the cylindrical battery heating system 1000, forming a battery pack assembly.

[0044] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above are only preferred embodiments of this application. It should be noted that due to the limitations of textual expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the application to other occasions without modification, should all be considered within the scope of protection of this application.

Claims

1. A cylindrical battery heating device, characterized by, For heating cylindrical batteries (2000), including: Two fixing seats (10) are provided, and the fixing seats (10) are provided with a mounting through hole (101) in the middle. The fixing seats (10) are sleeved on the end of the cylindrical battery (2000) through the mounting through hole (101); A connecting nickel plate (20) is provided inside the fixing base (10) and is electrically connected to an external power source; Two heating films (30) have an arc-shaped cross-section. The two heating films (30) symmetrically cover the outer peripheral surface of the cylindrical battery (2000), and both heating films (30) extend along the axial direction of the cylindrical battery (2000). The two ends of the heating films (30) are respectively inserted into the assembly through holes (101) of the two fixing seats (10) and connected to the connecting nickel sheet (20).

2. The cylindrical battery heating device of claim 1, wherein, The connecting nickel sheet (20) is arc-shaped, and the two ends of the arc shape of the connecting nickel sheet (20) have bent connecting feet (201).

3. The cylindrical battery heating device according to claim 2, characterized in that, The side wall of the fixing base (10) is provided with a connecting hole (102) that communicates with the assembly through hole (101). The position of the connecting hole (102) corresponds to the position of the connecting foot (201) so that the connecting foot (201) can extend out of the connecting hole (102) and extend in a direction away from the cylindrical battery (2000).

4. The cylindrical battery heating apparatus according to claim 3, characterized by The heating film (30) has metal contacts (301) at both ends of its outer surface, and the metal contacts (301) are connected to the connecting nickel sheet (20) through the connecting hole (102).

5. The cylindrical battery heating device according to any one of claims 1-4, wherein, The mounting base (10) has four spaced abutment portions (103), each abutment portion (103) covering at least part of the area of ​​the mounting through hole (101) so that when the mounting base (10) is fitted onto the end of the cylindrical battery (2000), the abutment portion (103) can abut against the end face of the cylindrical battery (2000) and the end face of the heating film (30).

6. The cylindrical battery heating apparatus according to claim 5, wherein The inner wall of the assembly through hole (101) is provided with an assembly groove (104) extending along its axial direction, the assembly groove (104) allowing the end of the heating film (30) to be inserted.

7. The cylindrical battery heating device according to claim 6, characterized in that, The two outer side walls of the fixing base (10) are provided with sliding protrusions (105) extending along the axial direction of the cylindrical battery (2000), and the two outer side walls of the fixing base (10) without the sliding protrusions (105) are provided with sliding grooves (106) extending along the axial direction of the cylindrical battery (2000). The sliding protrusions (105) can be slidably connected with the sliding grooves (106).

8. The cylindrical battery heating device of claim 7, wherein, The projections of the sliding protrusion (105) and the sliding groove (106) on a plane perpendicular to the axial direction of the cylindrical battery (2000) are both trapezoidal, and the upper bottom edge of the trapezoid is connected to the outer wall of the fixing seat (10).

9. A cylindrical battery heating system, characterized by, The cylindrical battery heating system (1000) is electrically connected to an external power source via the connecting pin (201) of the connecting nickel plate (20), and includes: A plurality of cylindrical battery heating devices (100) are cylindrical battery heating devices (100) as described in any one of claims 1-8. The plurality of cylindrical battery heating devices (100) are slidably connected to the sliding groove (106) via the sliding protrusion (105). The plurality of cylindrical battery heating devices (100) are electrically connected to each other via the connecting foot (201) of the connecting nickel sheet (20).

10. The cylindrical battery heating system of claim 9, wherein, Also includes: A nickel electrode sheet (200) electrically connects a plurality of the cylindrical cells (2000) through the assembly through-hole (101).

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