Heating structure and cell hole scalding device

Abstract

The utility model is applicable to the field of lithium ion batteries, and provides a heating structure and a battery cell hole ironing device, the heating structure comprises a heating box and a heating cylinder arranged in the heating box, and the heating cylinder is used for inserting an ironing needle; the heating box comprises a heating body, a first sealing plate and a second sealing plate, the first sealing plate and the second sealing plate are located on the two sides of the heating body and detachably connected with the heating body, the two ends of the heating cylinder are sleeved with a first bearing and a second bearing, and the first bearing and the second bearing are arranged in the heating body and fixed through the first sealing plate and the second sealing plate. A clamping piece is arranged on the side, away from the first sealing plate, of the first bearing of the heating cylinder, the clamping piece is used for limiting movement of the heating cylinder in the axial direction of the heating cylinder, and the clamping piece is detachably connected with the heating cylinder. And after the first sealing plate is detached from the heating main body, the first bearing, the clamping piece and the heating cylinder can be separated from the heating main body. According to the heating structure, the replacement efficiency of the heating cylinder can be effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of lithium-ion batteries, and in particular relates to a heating structure and a battery cell perforation device. Background Art

[0002] The cylindrical battery cell is formed by winding. After forming, there is often a section of diaphragm across the center hole of the battery cell. During the welding process of the wound battery cell and the bottom of the battery shell, the welding needle needs to pass through the center hole of the battery cell, or a conductive needle needs to be inserted into the center hole of the battery cell as needed. At this time, the welding needle or conductive needle inserted into the center hole is very likely to damage the diaphragm and cause an internal resistance short circuit. Therefore, after the battery cell is wound, the diaphragm needs to be shaped and attached to the hole wall of the center hole.

[0003] The applicant inserts a hot needle into the central hole to press the diaphragm against the hole wall and heats the diaphragm to shape it. Since the size specifications of the battery cells are different, the hot needle needs to be replaced according to different battery cells.

[0004] The heating structure is used to heat the ironing pins. The heating structure has a heating cylinder that matches the size of the ironing pins. The heating cylinder is a heat-conducting component, and heat conduction is achieved through the contact between the heating cylinder and the ironing pins. As the size of the ironing pins changes, the corresponding heating cylinder also needs to be replaced. The heating cylinder is fixed in the heating structure, and how to improve the replacement efficiency has become a technical problem that needs to be solved in this field. Utility Model Content

[0005] The purpose of the present application is to overcome the deficiencies of the above-mentioned prior art and to provide a heating structure and a battery core perforating device, which are intended to improve the efficiency of replacing the heating tube.

[0006] A heating structure for heating the ironing pins, comprising a heating box and a heating cylinder arranged in the heating box, the heating cylinder being plugged into the ironing pins;

[0007] The heating box comprises a heating body, and a first sealing plate and a second sealing plate located on both sides of the heating body and detachably connected to the heating body, a first bearing and a second bearing are sleeved at both ends of the heating cylinder, the first bearing and the second bearing are placed in the heating body and fixed by the first sealing plate and the second sealing plate;

[0008] The heating tube is provided with a clamping piece on the side of the first bearing away from the first sealing plate, the clamping piece is used to limit the movement of the heating tube along its axial direction, and the clamping piece is detachably connected to the heating tube;

[0009] Wherein, after the first sealing plate is disassembled from the heating body, the first bearing, the clamping member and the heating tube can be separated from the heating body.

[0010] Optionally, the heating tube is provided with a limiting portion on the side of the first bearing facing the first sealing plate, and a limiting groove which is engaged with the clamping piece is opened at a corresponding position of the clamping piece, and an assembly area for the first bearing to be sleeved is formed between the limiting groove and the limiting portion.

[0011] Optionally, the clamping member is a clamping ring and is sleeved on the limiting groove of the heating tube.

[0012] Optionally, the clamping member rotates synchronously with the heating tube, and the heating body is provided with an assembly groove for the clamping member to be inserted into, and the assembly groove and the clamping member are clearance-matched.

[0013] Optionally, the inner surface size of the heating cylinder is matched with the ironing needle.

[0014] Optionally, the heating cylinder rotates synchronously with the ironing needle.

[0015] Optionally, the heating body and the heating cylinder are gap-fitted.

[0016] Optionally, the heating box further comprises a heating element and a temperature sensor disposed in the heating body, and the heating element is used to heat the heating body.

[0017] A battery core punching device, applicable to a battery core having a central hole, comprising:

[0018] The hot pressing needle extends along a first direction, and the front end of the hot pressing needle along the first direction is a cone with a decreasing cross-sectional diameter;

[0019] A clamping structure, used for clamping the battery core and making the central hole of the battery core coaxial with the ironing needle;

[0020] A heating structure, used for heating the hot needles, wherein the heating structure is the heating structure as described above;

[0021] A driving structure, used for driving the hot needle to move back and forth along the first direction;

[0022] Wherein, the heating structure is located between the driving structure and the clamping structure. After the ironing needle is heated by the heating structure, the driving structure drives the ironing needle to extend into the central hole of the battery cell to iron and round the battery cell.

[0023] Optionally, the battery core perforation mechanism further includes a driver for driving the perforation needle to rotate;

[0024] The output shaft of the driver is connected to the ironing needle, and the driving structure drives the driver to move back and forth along the first direction to drive the ironing needle to move.

[0025] In the heating structure provided by the present application, when the heating cartridge needs to be replaced, the first sealing plate is removed from the heating body, at which time the opening of the first accommodating cavity is opened, and the heating cartridge and the clamping member and the first bearing thereon can be removed from the opening of the first accommodating cavity together. Then, a new heating cartridge with the clamping member and the first bearing is inserted from the opening of the first accommodating cavity, and the first sealing plate is fixedly connected to the heating body, and the replacement of the heating cartridge is completed.

[0026] As described above, by adopting the heating structure provided in the present application and the battery cell perforating device adopting the heating structure, the replacement of the heating tube only requires disassembling the connection between the first sealing plate and the heating body, without disassembling the second sealing plate, thereby effectively improving the replacement efficiency of the heating tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 is a schematic diagram of a battery cell before rounding in an embodiment of the present application;

[0029] Figure 2 It is a structural schematic diagram of a battery core punching device provided in an embodiment of the present application;

[0030] Figure 3 is a structural disassembly diagram of the heating structure in the embodiment of the present application;

[0031] Figure 4 It is a cross-sectional schematic diagram of the heating structure in the embodiment of the present application.

[0032] Description of Figure Numbers:

[0033] 10. Heating structure; 11. Heating box; 111. Heating body; 112. First sealing plate; 113. Second sealing plate; 101. Assembly groove; 114. Protective shell; 12. Heating tube; 121. Limiting part; 122. Limiting groove; 13. First bearing; 14. Second bearing; 15. Connecting piece; 20. Hot needle; 30. Clamping structure; 50. Rotator; 60. Fixing frame; 61. Pushing slide rail; 80. Battery cell; 801. Center hole; 81. Diaphragm. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] It should also be noted that the directional terms such as left, right, up and down in the embodiments of the present application are merely relative concepts or are based on the normal use status of the product, and should not be considered as restrictive.

[0038] Please combine Figures 1 to 4 Now, the heating structure 10 provided in the present application and the battery core punching device using the heating structure 10 are exemplarily described.

[0039] Combination Figure 1 The cylindrical battery cell 80 is formed by winding. After forming, a section of diaphragm 81 is often present in the center hole 801 of the battery cell 80 , which is horizontal to the center hole 801 .

[0040] In this embodiment, the cell punching device inserts the punching needle 20 into the central hole 801 of the cell 80 so that the diaphragm 81 adheres to the hole wall of the central hole 801 , and heats the diaphragm 81 through the punching needle 20 to shape the diaphragm 81 .

[0041] For details, please refer to Figure 2 The battery cell hole hot stamping device includes a hot stamping needle 20, a clamping structure 30, a heating structure 10 and a driving structure 40.

[0042] The hot pin 20 extends along the first direction, and the front end of the hot pin 20 along the first direction is a cone with a decreasing cross-sectional diameter. The clamping structure 30 is used to clamp the battery cell 80 and make the central hole 801 of the battery cell 80 coaxial with the hot pin 20. The heating structure 10 is used to heat the hot pin 20. The driving structure 40 is used to drive the hot pin 20 to move back and forth along the first direction.

[0043] After the ironing needle 20 is heated by the heating structure 10 , the driving structure 40 drives the ironing needle 20 to extend into the central hole 801 of the battery cell 80 to iron and round the battery cell 80 .

[0044] In this embodiment, the hot pin 20 extends along the first direction. For the convenience of description, the first direction is defined as the front-to-back direction. The front end of the hot pin 20 is conical, in other words, the front end of the hot pin 20 is a sharp tip. This setting can reduce the difficulty of the hot pin 20 entering the center hole 801. More importantly, since the front end of the hot pin 20 is a sharp tip, it is not easy to collide with the diaphragm 81 when the tip is inserted into the center hole 801 compared to the design in which the front end surface is a table. Even if there is a collision, the diaphragm 81 is easy to deform after the collision and avoid the hot pin 20, ensuring that the hot pin 20 is smoothly inserted into the center hole 801.

[0045] After entering the central hole 801, the ironing needle 20 presses the membrane 81 against the wall of the central hole 801, and irons the membrane 81 by the heated ironing needle 20, thereby achieving the effect of ironing and shaping. Compared with a single pressing, the effect of the membrane 81 being attached to the wall of the central hole 801 can be maintained for a longer period of time, thereby ensuring the shaping quality.

[0046] The hot pin 20 is heated before entering the central hole 801 of the battery cell 80. In other words, the hot pin 20 is heated outside the battery cell 80 to facilitate the arrangement of the heating structure 10 and the clamping structure.

[0047] In the illustrated structure, the heating structure 10 is located behind the clamping structure along the first direction, and the ironing needle 20 moves forward after being heated by the heating structure 10 and extends into the central hole 801 of the battery cell 80 fixed by the clamping structure.

[0048] The clamping structure is used to clamp the battery cell 80 and make the center hole 801 of the battery cell 80 coaxial with the ironing needle 20. After the clamping structure clamps the battery cell 80, since the center hole 801 of the battery cell 80 is coaxial with the ironing needle 20, the ironing needle 20 only needs to move forward to be inserted into the center hole 801 of the battery cell 80, and move backward to reset, thereby simplifying the control.

[0049] In this embodiment, the clamping structure 30 includes two battery cell clamping jaws arranged opposite to each other and a clamping jaw driver for controlling the opening and closing of the two battery cell clamping jaws. The opposing surfaces of the two battery cell clamping jaws are arc surfaces.

[0050] The two battery cell clamps are arranged opposite to each other, and the battery cell 80 can be taken in and out by opening and closing. The surfaces of the two battery cell clamps are arc surfaces, which are adapted to the battery cell 80, so that when the two battery cell clamps are close to each other, the battery cell 80 can be adaptively moved to the central axis of the cylindrical surface formed by the two arc surfaces, thereby realizing the centering of the battery cell 80. The central axis of the cylindrical surface is coaxial with the ironing needle 20, so as to ensure that the ironing needle 20 moves forward and can be inserted into the central hole 801 of the battery cell 80.

[0051] Please refer to Figure 2The battery cell perforating device further includes a fixing frame 60, which provides a fixed support for the heating structure 10, the clamping structure 30 and the driving structure 40 and ensures that the relative position relationship between them is fixed.

[0052] In another embodiment of the present application, please refer to Figure 2 The battery cell perforating device also includes a driver 50 for driving the hot pin 20 to rotate; the output shaft of the driver 50 is connected to the hot pin 20, and the driving structure 40 drives the driver 50 to move back and forth along the first direction to drive the hot pin 20 to move.

[0053] Figure 2 In the structure shown, a push rail 61 is provided on the fixed frame 60, and the push rail 61 extends forward and backward, and a push slider is slidably connected to the push rail 61, and the drive rotator 50 is fixed on the push slider. The driving structure 40 drives the push slider to move forward, thereby driving the ironing needle 20 to move forward.

[0054] After the clamping structure 30 clamps the battery cell 80 and makes the central hole 801 of the battery cell 80 coaxial with the ironing needle 20, the driving structure 40 drives the ironing needle 20 to move forward, and at the same time, the driving device 50 drives the ironing needle 20 to rotate, so that the ironing needle 20 is screwed into the battery cell 80. Under this setting, if the ironing needle 20 conflicts with the diaphragm 81 when moving forward, the rotation of the ironing needle 20 also causes the diaphragm 81 to deviate to the peripheral side of the ironing needle 20, thereby further reducing the risk of damaging the diaphragm 81 due to the conflict. In addition, after the ironing needle 20 enters the battery cell 80, the ironing needle 20 abuts against the hole wall of the central hole 801 of the battery cell 80, and the rotation of the ironing needle 20 can help reduce the adhesion between the ironing needle 20 and the diaphragm 81, thereby ensuring the ironing effect.

[0055] In this embodiment, the driver 50 is a motor, and the rotating shaft of the driver 50 is fixedly connected to the ironing needle 20 via a coupling.

[0056] In another embodiment of the present application, the outer surface of the ironing pin 20 is coated with a heat-conductive anti-sticking adhesive to further reduce the risk of adhesion between the ironing pin 20 and the diaphragm 81.

[0057] In another embodiment of the present application, please refer to Figure 3 and Figure 4 The heating structure 10 includes a heating box 11 and a heating tube 12 disposed in the heating box 11 . The heating tube 12 is rotatably connected to the heating box 11 . The heating tube 12 is plugged into the ironing needle 20 and is matched with the ironing needle 20 .

[0058] The length of the ironing needle 20 is not less than twice the length of the heating box 11, and the front and rear of the ironing needle 20 are divided into a heating zone and an extension zone. In the initial state, the heating zone of the ironing needle 20 is located in the heating box 11 and heated to a preset temperature. After the clamping structure 30 clamps the battery cell 80, the ironing needle 20 moves forward so that the heating zone of the ironing needle 20 extends into the battery cell 80 to iron the battery cell 80. At this time, the extension zone is located in the heating box 11.

[0059] Considering that the ironing pin 20 needs to move forward and backward and rotate relative to the heating box 11, a heating cylinder 12 is sleeved on the ironing pin 20, and the ironing pin 20 can move forward and backward relative to the heating cylinder 12, and the heating cylinder 12 can rotate relative to the heating cylinder 12. The setting of the heating cylinder 12 separates the functions of relative rotation and relative movement between the heating structure 10 and the ironing pin 20. The movement relative to the heating structure 10 is achieved by the sliding connection between the ironing pin 20 and the heating cylinder 12, and the rotation of the ironing pin 20 relative to the heating structure 10 is achieved by the rotation of the heating cylinder 12 and the heating box 11. In addition, the heating cylinder 12 is a heat transfer component, preferably a metal component. The heating cylinder 12 contacts the surface of the ironing pin 20 to achieve heat conduction, which has a higher conduction efficiency than air heat transfer.

[0060] In this embodiment, the heating cylinder 12 is rotatably connected to the heating box 11 via a bearing.

[0061] Considering that the size of the ironing pin 20 needs to be changed according to the size of the battery cell 80, the heating tube 12 needs to be matched with the ironing pin 20. Therefore, when the size of the ironing pin 20 changes, the heating tube 12 also needs to be replaced accordingly. However, since the heating tube 12 is arranged inside the heating box 11, it is inconvenient to disassemble and replace.

[0062] In order to improve the replacement efficiency of the heating tube 12, in this embodiment, the heating box 11 includes a heating body 111, and a first sealing plate 112 and a second sealing plate 113 located on both sides of the heating body 111 and detachably connected to the heating body 111. The first bearing 13 and the second bearing 14 are sleeved at both ends of the heating tube 12, and the first bearing 13 and the second bearing 14 are placed in the heating body 111 and fixed by the first sealing plate 112 and the second sealing plate 113. The heating tube 12 is provided with a clamping member 15 on the side of the first bearing 13 away from the first sealing plate 112, and the clamping member 15 is used to limit the movement of the heating tube 12 along its axial direction, and the clamping member 15 is detachably connected to the heating tube 12. After the first sealing plate 112 is removed from the heating body 111, the first bearing 13, the clamping member 15 and the heating tube 12 can be separated from the heating body 111.

[0063] Specifically, the heating body 111 has an assembly space that is arranged to pass through from front to back, and the assembly space is divided into a first accommodating chamber for accommodating the first bearing 13, a second accommodating chamber for accommodating the second bearing 14, and a heating chamber located between the first bearing 13 and the second bearing 14 according to the function. The heating chamber is provided with an assembly groove 101 for assembling the clamping member 15 adjacent to the first bearing 13, and the assembly groove 101 is communicated with the first accommodating chamber.

[0064] The two ends of the heating tube 12 are respectively plugged with the first bearing 13 and the second bearing 14. The first bearing 13 and the second bearing 14 limit the heating tube 12 to have only the freedom of moving in the front-back direction and rotating along the axial direction. The clamping member 15 limits the front-back movement of the heating tube 12. From then on, the heating tube 12 only has the freedom of rotating around the axis.

[0065] In this embodiment, the first accommodating chamber and the second accommodating chamber have an outward opening. After the first bearing 13 and the second bearing 14 are respectively placed in the first accommodating chamber and the second accommodating chamber, the first sealing plate 112 and the second sealing plate 113 are fixedly connected to the heating body 111 to achieve the fixation of the first bearing 13 and the second bearing 14. The clamping member 15 is detachably connected to the heating cylinder 12 to avoid the assembly operation of the first bearing 13, and the first accommodating chamber communicated with the assembly groove 101, so that the clamping member 15 can enter the assembly groove 101 through the opening of the first accommodating chamber.

[0066] In this embodiment, the heating tube 12 is assembled as follows: the first bearing 13 and the clamping member 15 are inserted into the heating tube 12, and then the heating tube 12 is placed into the assembly space from the cavity opening of the first accommodating cavity. At this time, the clamping member 15 is located in the assembly groove 101 and the first bearing 13 is located in the first accommodating cavity. The first sealing plate 112 is covered on the heating body 111 and fixedly connected, thereby closing the cavity opening of the first accommodating cavity, and achieving relative fixation of the positions of the heating tube 12, the clamping member 15 and the first bearing 13 and the heating box 11. The second bearing 14 is inserted into the second accommodating cavity from the cavity opening of the second accommodating cavity and is sleeved on the heating tube 12, and then the second sealing plate 113 is covered on the heating body 111 and fixedly connected, thereby closing the cavity opening of the second accommodating cavity, and achieving fixation of the second bearing 14.

[0067] When the heating cartridge 12 needs to be replaced, the first sealing plate 112 is removed from the heating body 111. At this time, the opening of the first accommodating chamber is opened, and the heating cartridge 12 and the clamping member 15 and the first bearing 13 thereon can be removed from the opening of the first accommodating chamber. Then, a new heating cartridge 12 with the clamping member 15 and the first bearing 13 is inserted from the opening of the first accommodating chamber, and the first sealing plate 112 is fixedly connected to the heating body 111, and the replacement of the heating cartridge 12 is completed.

[0068] As can be seen from the above, with the heating structure 10 provided in this embodiment, the replacement of the heating tube 12 only requires disassembling the connection between the first sealing plate 112 and the heating body 111, without disassembling the second sealing plate 113, thereby effectively improving the replacement efficiency of the heating tube 12.

[0069] In this embodiment, the detachable connection between the first sealing plate 112, the second sealing plate 113 and the heating body 111 may be a screw connection.

[0070] In another embodiment of the present application, a limiting portion 121 is provided on the side of the first bearing 13 facing the first sealing plate 112 of the heating tube 12, and a limiting groove 122 which is engaged with the clamping member 15 is provided at a corresponding position of the clamping member 15, and an assembly area for the first bearing 13 to be sleeved is formed between the limiting groove 122 and the limiting portion 121.

[0071] The clamping member 15 partially extends into the limiting groove 122, and partially protrudes from the limiting groove 122 and is placed in the assembly groove 101. The protruding portion abuts against the groove wall of the assembly groove 101 to limit the movement of the heating tube 12 and the heating body 111 in the front-rear direction.

[0072] With the first bearing 13 being located in front of the second bearing 14 as a direction reference, a limiting portion 121 is provided at the front end of the heating tube 12 , and the limiting groove 122 , the assembly area and the limiting portion 121 are arranged from back to front.

[0073] During assembly, the first bearing 13 is first inserted into the heating tube 12 from the rear, and then the clamping member 15 is inserted into the heating tube 12 . Due to the obstruction of the limiting portion 121 , the clamping member 15 and the first bearing 13 will not fall from the front of the heating tube 12 .

[0074] The first sealing plate 112 is provided with an escape hole for escaping the limiting portion 121. When the heating tube 12 and the clamping member 15 and the first bearing 13 thereon are placed into the heating body 111, the limiting portion 121 is located in the escape hole.

[0075] In another embodiment of the present application, please refer to Figure 3 The clamping member 15 is a clamping ring. The clamping member 15 is sleeved on the limiting groove 122 of the heating tube 12 to fix the relative position of the clamping member 15 and the heating tube 12. In other embodiments, the clamping member 15 can also be a latch.

[0076] In another embodiment of the present application, the inner surface size of the heating tube 12 is matched with the ironing pin 20. This configuration allows the heating tube 12 to be in surface contact with the ironing pin 20, which is beneficial to improve the heat conduction efficiency between the heating tube 12 and the ironing pin 20.

[0077] In another embodiment of the present application, the heating tube 12 rotates synchronously with the ironing needle 20. This arrangement can avoid friction caused by the relative rotation of the heating tube 12 and the ironing needle 20 on the one hand, and can effectively ensure close contact between the heating tube 12 and the ironing needle 20 on the other hand, which is beneficial to heat conduction.

[0078] In another embodiment of the present application, the clamping member 15 rotates synchronously with the heating tube 12, and the assembly groove 101 is clearance-matched with the clamping member 15. This arrangement can effectively improve the friction between the clamping member 15 and the heating tube 12 and the heating body 111.

[0079] In another embodiment of the present application, the heating body 111 is equipped with a heating element, which can generate heat when powered. The heating body 111 is a heat-conducting element. The heating body 111 is also provided with a temperature sensor for detecting the temperature in the heating chamber, so as to provide feedback and control the temperature of the ironing needle 20.

[0080] In another embodiment of the present application, the heating body 111 is gap-matched with the heating tube 12. There is a gap between the cavity wall of the heating cavity and the heating tube 12 to avoid friction between the heating tube 12 and the heating box 11 due to abutment.

[0081] In another embodiment of the present application, please refer to Figure 3 The heating box 11 also includes a protective shell 114 which is sleeved on the outside of the heating body 111 .

[0082] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A heating structure for heating a hot needle, characterized in that: It comprises a heating box and a heating cylinder arranged in the heating box, and the heating cylinder is plugged into the ironing needle; The heating box comprises a heating body, and a first sealing plate and a second sealing plate located on both sides of the heating body and detachably connected to the heating body, a first bearing and a second bearing are sleeved at both ends of the heating cylinder, the first bearing and the second bearing are placed in the heating body and fixed by the first sealing plate and the second sealing plate; The heating tube is provided with a clamping piece on the side of the first bearing away from the first sealing plate, the clamping piece is used to limit the movement of the heating tube along its axial direction, and the clamping piece is detachably connected to the heating tube; Wherein, after the first sealing plate is disassembled from the heating body, the first bearing, the clamping member and the heating tube can be separated from the heating body.

2. The heating structure according to claim 1, characterized in that: The heating tube is provided with a limiting portion on the side of the first bearing facing the first sealing plate, and a limiting groove which is engaged with the clamping piece is opened at a corresponding position of the clamping piece, and an assembly area for the first bearing to be sleeved is formed between the limiting groove and the limiting portion.

3. The heating structure according to claim 2, characterized in that: The clamping member is a clamping ring and is sleeved on the limiting groove of the heating tube.

4. The heating structure according to claim 3, characterized in that: The clamping piece rotates synchronously with the heating tube, and the heating body is provided with an assembly groove for the clamping piece to be placed therein, and the assembly groove is clearance-matched with the clamping piece.

5. The heating structure according to claim 1, characterized in that: The inner surface size of the heating cylinder is matched with the ironing needle.

6. The heating structure according to claim 5, characterized in that: The heating cylinder rotates synchronously with the ironing needle.

7. The heating structure according to any one of claims 1 to 6, characterized in that: The heating body and the heating cylinder are clearance-matched.

8. The heating structure according to any one of claims 1 to 6, characterized in that: The heating box further comprises a heating element and a temperature sensor arranged in the heating body, wherein the heating element is used for heating the heating body.

9. A battery core perforation device, suitable for a battery core having a central hole, characterized in that: include: The hot pressing needle extends along a first direction, and the front end of the hot pressing needle along the first direction is a cone with a decreasing cross-sectional diameter; A clamping structure, used for clamping the battery core and making the central hole of the battery core coaxial with the ironing needle; A heating structure, used for heating the hot needle, wherein the heating structure is the heating structure according to any one of claims 1 to 8; A driving structure, used for driving the hot needle to move back and forth along the first direction; Wherein, the heating structure is located between the driving structure and the clamping structure. After the ironing needle is heated by the heating structure, the driving structure drives the ironing needle to extend into the central hole of the battery cell to iron and round the battery cell.

10. The battery core perforating device according to claim 9, characterized in that: The battery core perforation mechanism also includes a driver for driving the perforation needle to rotate; The output shaft of the driver is connected to the ironing needle, and the driving structure drives the driver to move back and forth along the first direction to drive the ironing needle to move.

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