Lithium iron phosphate battery negative electrode pre-lithiation mechanical calendaring molding device

Abstract

The utility model discloses a lithium iron phosphate battery negative electrode pre-lithiation mechanical calendaring molding device, which comprises a calender, an adjusting mechanism and a protection mechanism, both sides of the bottom end of the calender are provided with supporting legs, the surface of the calender is provided with an adjusting and controlling panel, one side of the surface of the calender is provided with an indicating lamp, and the other side of the calender is provided with an indicating lamp. A statistical panel is arranged at one end of the surface of the calender, and a speed adjusting knob is arranged on one side of the bottom end of the surface of the calender. According to the lithium iron phosphate battery negative electrode pre-lithiation mechanical calendaring forming device, through the arrangement of the protection mechanism, when a lithium battery pole piece is subjected to calendaring forming, the lithium battery pole piece is conveniently pushed between a calendaring roller and a heat conduction roller through a material guide groove formed in the surface of a protection cover in the protection mechanism; the lithium battery pole piece is sucked through rotation of the heat conduction roller for calendaring processing, external dust and sundries can be effectively prevented from adhering to the heat conduction roller and the calendaring roller through the protective cover, and the production quality of the pole piece is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium iron phosphate batteries, specifically to a mechanical calendering and forming device for pre-lithiation of the negative electrode of a lithium iron phosphate battery. Background Technology

[0002] Lithium iron phosphate (LFP) batteries are lithium-ion batteries that use lithium iron phosphate as the positive electrode material and carbon as the negative electrode material. A single cell has a rated voltage of 3.2V and a charging cut-off voltage of 3.6V–3.65V. During charging, some lithium ions in the lithium iron phosphate are released and transferred to the negative electrode via the electrolyte, embedding into the negative electrode carbon material. Simultaneously, electrons are released from the positive electrode and travel from the external circuit to the negative electrode, maintaining the chemical reaction balance. During discharging, lithium ions are released from the negative electrode and travel from the electrolyte to the positive electrode, while electrons are released from the negative electrode and travel from the external circuit to the positive electrode, providing energy to the outside world. A calendering device is required when calendering the electrodes of lithium iron phosphate batteries; therefore, a mechanical calendering device for pre-lithiation of the negative electrode of lithium iron phosphate batteries is urgently needed.

[0003] Currently used mechanical calendering and forming equipment for pre-lithiation of lithium iron phosphate battery negative electrodes lacks external protective measures for the calendering tank, making it easy for dust and debris to enter the calendering rollers. When calendering lithium battery electrodes, the entrained dust and debris will press onto the electrodes, affecting their quality. Furthermore, traditional calenders are not convenient for adjusting according to the thickness of the electrodes. Utility Model Content

[0004] The purpose of this invention is to provide a mechanical calendering and forming device for pre-lithiation of lithium iron phosphate battery negative electrode, in order to solve the problems mentioned in the background art. The calendering tank of the currently used mechanical calendering and forming device for pre-lithiation of lithium iron phosphate battery negative electrode has no external protective measures, which easily leads to dust and debris entering the calendering roller. When calendering the lithium battery electrode sheet, the dust and debris that are rolled in will press onto the electrode sheet, affecting the quality of the electrode sheet. In addition, traditional calendering machines are not convenient to adjust according to the thickness of the electrode sheet.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mechanical calendering and forming device for pre-lithiation of the negative electrode of a lithium iron phosphate battery, comprising a calender, an adjustment mechanism, and a protective mechanism. Support feet are provided on both sides of the bottom of the calender, and a control panel is provided on the surface of the calender. An indicator light is provided on one side of the surface of the calender, and a statistics panel is provided at one end of the surface of the calender. A speed adjustment knob is provided on one side of the bottom of the surface of the calender, and an emergency stop button is provided on one side of the bottom of the surface of the calender. A control knob is provided at the bottom of the surface of the calender. A power switch is provided at the bottom of the surface of the calender. A calendering groove is provided at the other end of the surface of the calender, and a heat-conducting roller is provided at the bottom of the calendering groove. The adjustment mechanism is provided at the top of the inner wall of the calendering groove. A cylinder is provided at the top of the calendering machine. The protective mechanism is installed at the front end of the calendering groove. The protective mechanism includes a protective cover, a guide groove, and a fixing rod. The protective cover is installed at the front end of the calendering groove. A guide groove is provided on the inner wall of the protective cover, and a fixing rod is installed on the outer wall of the protective cover. Heat dissipation side plates are provided at both ends of the outer wall of the calendering machine, and limit rods are installed on the inner walls of the heat dissipation side plates.

[0006] Preferably, the adjusting mechanism includes a calendering roller, a slider, and a lifting rod. The calendering roller is disposed at the top of the inner wall of the calendering groove, and sliders are disposed at both ends of the outer wall of the calendering roller, with a lifting rod disposed at the top of the slider.

[0007] Preferably, the calendering roll forms a lifting structure with the calendering groove via a lifting rod, and the lifting rod is arranged symmetrically about the central axis of the calendering roll.

[0008] Preferably, the protective cover is threadedly connected to the calender via a fixing rod, and both the outer wall of the fixing rod and the inner wall of the calender are threaded.

[0009] Preferably, the heat dissipation side plate is threadedly connected to the calender via a limiting rod, and both the outer wall of the limiting rod and the inner wall of the calender are threaded.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. The pre-lithiation mechanical calendering and forming device for lithium iron phosphate battery negative electrode, through the setting of a protective mechanism, facilitates the feeding of lithium battery electrode sheets into the space between the calendering roller and the heat-conducting roller during the calendering and forming of lithium battery electrode sheets. The rotation of the heat-conducting roller draws the lithium battery electrode sheet into the calendering process. The protective cover can effectively prevent external dust and debris from adhering to the heat-conducting roller and the calendering roller, thereby improving the production quality of the electrode sheets.

[0012] 2. This mechanical calendering and forming device for pre-lithiation of lithium iron phosphate battery negative electrode, through the setting of an adjustment mechanism, facilitates the raising and lowering of the slider and calendering roller by a cylinder driven by the lifting rod in the adjustment mechanism according to the thickness of the electrode material during the calendering and forming of lithium battery electrode sheets. This allows for fine adjustment of the distance between the calendering roller and the heat-conducting roller, thereby enabling the calendering and forming of electrode sheets with different material thicknesses and improving the adjustability of the device. Attached Figure Description

[0013] Figure 1 This is a front view of the present utility model;

[0014] Figure 2 This is a side view of the present invention;

[0015] Figure 3 This is a drawing of the protective mechanism parts of this utility model.

[0016] In the diagram: 1. Calender; 2. Support foot; 3. Control panel; 4. Indicator light; 5. Statistics panel; 6. Speed ​​control knob; 7. Emergency stop button; 8. Control knob; 9. Power switch; 10. Calendering trough; 11. Heat-conducting roller; 12. Adjustment mechanism; 1201. Calendering roller; 1202. Slider; 1203. Lifting rod; 13. Cylinder; 14. Protective mechanism; 1401. Protective cover; 1402. Guide trough; 1403. Fixing rod; 15. Heat dissipation side plate; 16. Limiting rod. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3This utility model provides a technical solution: a mechanical calendering and forming device for pre-lithiation of the negative electrode of a lithium iron phosphate battery, including a calender 1, an adjusting mechanism 12, and a protective mechanism 14. Support feet 2 are provided on both sides of the bottom end of the calender 1, and an adjustment panel 3 is provided on the surface of the calender 1. An indicator light 4 is provided on one side of the surface of the calender 1, and a statistics panel 5 is provided at one end of the surface of the calender 1. A speed adjustment knob 6 is provided on one side of the bottom end of the surface of the calender 1, and an emergency stop button 7 is provided on one side of the bottom end of the surface of the calender 1. A control knob 8 is provided on the bottom end of the surface of the calender 1, and a power switch 9 is provided on the bottom end of the surface of the calender 1. A calendering groove 10 is formed at the other end of the surface of the calender 1, and a heat-conducting roller 11 is provided at the bottom end of the calendering groove 10. The adjusting mechanism 12 is located at the top of the inner wall of the calendering groove 10, and the adjusting mechanism 12 includes a calendering roller 1201. The device includes a slider 1202 and a lifting rod 1203. The calendering roller 1201 is located at the top of the inner wall of the calendering groove 10. Slider 1202s are provided at both ends of the outer wall of the calendering roller 1201, and a lifting rod 1203 is provided at the top of the slider 1202. The calendering roller 1201 and the calendering groove 10 form a lifting structure through the lifting rod 1203. The lifting rod 1203 is symmetrically arranged about the central axis of the calendering roller 1201. Through the adjustment mechanism 12, it is convenient to adjust the distance between the calendering roller 1201 and the heat-conducting roller 11 by driving the lifting rod 1203 in the adjustment mechanism 12 according to the thickness of the electrode material during the calendering of lithium battery electrode sheets. This allows for the calendering of electrode sheets with different material thicknesses and improves the adjustability of the device.

[0019] A cylinder 13 is installed at the top of the calender 1. A protective mechanism 14 is installed at the front end of the calender 10. The protective mechanism 14 includes a protective cover 1401, a guide chute 1402, and a fixing rod 1403. The protective cover 1401 is installed at the front end of the calender 10. The guide chute 1402 is opened on the inner wall of the protective cover 1401, and the fixing rod 1403 is installed on the outer wall of the protective cover 1401. The protective cover 1401 is threadedly connected to the calender 1 through the fixing rod 1403, and the outer wall of the fixing rod 1403 and the inner wall of the calender 1 are both threaded. The heat dissipation side plate 15 is threadedly connected to the calender 1 through a limiting rod 16, and the outer wall of the limiting rod 16 is threaded. The inner wall of the calender 1 is threaded, and both ends of the outer wall of the calender 1 are provided with heat dissipation side plates 15. The inner wall of the heat dissipation side plates 15 is equipped with limit rods 16. With the provision of the protective mechanism 14, it is convenient to push the lithium battery electrode sheet into the space between the calendering roller 1201 and the heat-conducting roller 11 through the guide groove 1402 opened on the surface of the protective cover 1401 in the protective mechanism 14 during the calendering process. The lithium battery electrode sheet is sucked in by the rotation of the heat-conducting roller 11 for calendering. The protective cover 1401 can effectively prevent external dust and debris from sticking to the heat-conducting roller 11 and the calendering roller 1201, thereby improving the production quality of the electrode sheet.

[0020] Working principle: When calendering the electrode sheets of lithium iron phosphate batteries, first press the power switch 9 on the surface of the calender 1 to start the equipment, and set the heating temperature of the heat-conducting roller 11 through the control panel 3. The heat-conducting roller 11 is heated by the heater inside the calender 1, and the rotation speed and direction of the heat-conducting roller 11 are set by the speed adjustment knob 6 and the control knob 8. Then, according to the thickness of the electrode material, the cylinder 13 drives the lifting rod 1203 in the adjustment mechanism 12, thereby driving the slider 1202 and the calendering roller 1201 to rise and fall, thus finely adjusting the distance between the calendering roller 1201 and the heat-conducting roller 11. The device improves the adjustability of the electrode sheet by calendering electrodes of different material thicknesses. The lithium battery electrode sheet material is then pushed into the space between the calendering roller 1201 and the heat-conducting roller 11 through the guide groove 1402 on the surface of the protective cover 1401 in the protective mechanism 14. The lithium battery electrode sheet is sucked in by the rotation of the heat-conducting roller 11 for calendering. The protective cover 1401 can effectively prevent external dust and debris from sticking to the heat-conducting roller 11 and the calendering roller 1201, thus improving the production quality of the electrode sheet. In addition, the limiting rod 16 can facilitate the disassembly and assembly of the heat dissipation side plate 15, which is convenient for maintenance and repair, and also facilitates heat dissipation during equipment operation.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mechanical calendering apparatus for pre-lithiation of the negative electrode of a lithium iron phosphate battery, characterized in that, The calender (1) includes a calender (1), an adjustment mechanism (12), and a protective mechanism (14). Support feet (2) are provided on both sides of the bottom of the calender (1). An adjustment panel (3) is provided on the surface of the calender (1). An indicator light (4) is provided on one side of the surface of the calender (1). A statistics panel (5) is provided at one end of the surface of the calender (1). A speed adjustment knob (6) is provided on one side of the bottom of the surface of the calender (1). An emergency stop button (7) is provided on one side of the bottom of the surface of the calender (1). A control knob (8) is provided at the bottom of the surface of the calender (1). A power switch (9) is provided at the bottom of the surface of the calender (1). A calendering groove (10) is opened at the other end of the surface of the calender (1). The bottom of the calendering groove (10)... A heat-conducting roller (11) is provided at the end of the calender (10). The adjustment mechanism (12) is provided at the top of the inner wall of the calender (10). A cylinder (13) is provided at the top of the calender (1). The protective mechanism (14) is installed at the front end of the calender (10). The protective mechanism (14) includes a protective cover (1401), a guide groove (1402), and a fixing rod (1403). The protective cover (1401) is installed at the front end of the calender (10). The inner wall of the protective cover (1401) is provided with a guide groove (1402), and the outer wall of the protective cover (1401) is provided with a fixing rod (1403). Both ends of the outer wall of the calender (1) are provided with heat dissipation side plates (15), and the inner wall of the heat dissipation side plates (15) is provided with a limit rod (16).

2. The mechanical calendering and forming apparatus for pre-lithiation of the negative electrode of a lithium iron phosphate battery according to claim 1, characterized in that: The adjustment mechanism (12) includes a calendering roller (1201), a slider (1202), and a lifting rod (1203). The calendering roller (1201) is located at the top of the inner wall of the calendering groove (10). Sliders (1202) are provided at both ends of the outer wall of the calendering roller (1201), and a lifting rod (1203) is provided at the top of the slider (1202).

3. The mechanical calendering and forming apparatus for pre-lithiation of the negative electrode of a lithium iron phosphate battery according to claim 2, characterized in that: The calendering roll (1201) forms a lifting structure with the calendering groove (10) through the lifting rod (1203), and the lifting rod (1203) is symmetrical about the central axis of the calendering roll (1201).

4. The mechanical calendering and forming apparatus for pre-lithiation of the negative electrode of a lithium iron phosphate battery according to claim 1, characterized in that: The protective cover (1401) is threadedly connected to the calender (1) via a fixing rod (1403), and both the outer wall of the fixing rod (1403) and the inner wall of the calender (1) are threaded.

5. The mechanical calendering apparatus for pre-lithiation of the negative electrode of a lithium iron phosphate battery according to claim 1, characterized in that: The heat dissipation side plate (15) is threadedly connected to the calender (1) via a limiting rod (16), and both the outer wall of the limiting rod (16) and the inner wall of the calender (1) are threaded.

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