Infrared temperature compensation device outside lithium battery cathode coating oven

Abstract

The utility model discloses an infrared temperature compensation device outside a lithium battery cathode coating oven, which is used for being mounted on a transmission path at an outlet of the coating oven, and comprises a base, a pair of lifting adjusting mechanisms, a pair of connecting brackets, a reflecting lampshade assembly, an infrared lamp tube group and a shading device, and the lifting adjusting mechanisms are mounted on the base; the connecting bracket is mounted on the lifting adjusting mechanism; the reflecting lampshade assembly is installed on the connecting support and comprises a reflecting lampshade unit, and the reflecting lampshade unit is provided with a lamp tube installation cavity extending in the length direction; the infrared lamp tube set comprises a plurality of infrared lamp tubes, and the infrared lamp tubes are detachably installed in the lamp tube installation cavity. The drying oven can effectively solve the problems of insufficient drying capacity caused by the heating mode of a traditional drying oven and cracking of a single-side coated pole piece caused by too fast convection drying, meanwhile, the drying efficiency is improved, the energy consumption is reduced, and the drying oven meets the production requirements of products with different widths.

Description

Technical Field

[0001] This utility model relates to an external infrared heating device for a lithium battery negative electrode coating oven, belonging to the field of battery production technology. Background Technology

[0002] In the coating process of lithium-ion batteries, the drying process of the electrode coating has a decisive impact on battery performance. Traditional drying ovens achieve moisture evaporation through hot air convection or non-contact heating, but they suffer from low thermal efficiency and insufficient penetration depth. Hot air circulation systems have high energy loss, with approximately 30% to 40% of heat being discharged with the exhaust gas, and the heat transfer rate is limited by air flow, making it difficult to meet the rapid drying requirements of aqueous anodes with high water content. At the same time, contact heating only acts on the surface of the electrode and cannot achieve efficient migration of internal moisture.

[0003] Excessively rapid convection drying leads to frequent single-sided cracking of the negative electrode. When the negative electrode is heated on one side, the solvent on the heated side evaporates preferentially, and the surface slurry quickly solidifies to form a dense layer. Meanwhile, the solvent residue on the back side creates a concentration gradient, resulting in directional shrinkage during drying. Furthermore, in silicon-carbon systems, during the drying process, silicon particles expand locally due to the difference in interfacial wettability between the surface oxide layer and the binder. This expansion compresses the surrounding silicon volume and the bonding network, ultimately making single-sided electrodes more prone to cracking under traditional oven heating conditions.

[0004] After searching the existing technology, Chinese patent CN109378442A was found to disclose an automated production line for lithium battery cells, which uses a double-layer drying device. This technical solution includes a slurry conveying system, a coating device, and a double-layer drying device. The positive and negative electrode sheets are coated using a double-sided simultaneous extrusion coating machine, and then dried using the double-layer drying device. However, during use, it was found that due to the small size of some production lines, the length of the drying oven is limited, making it difficult to fully dry the electrode sheets while ensuring the required coating speed. The electrode sheets often exit the oven in a semi-wet film state. Furthermore, the traditional hot air convection drying method easily causes rapid solidification of the negative electrode surface while leaving internal moisture, leading to cracking problems in electrode sheets coated on one side. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the shortcomings of existing technologies and provide an external infrared heating device for lithium battery negative electrode coating ovens. This device effectively addresses the insufficient drying capacity and cracking of single-sided coated electrodes caused by excessively rapid convection drying, as well as the problems associated with traditional oven heating methods. Simultaneously, it improves drying efficiency, reduces energy consumption, and adapts to the production needs of products with varying widths.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: an external infrared heating device for a lithium battery negative electrode coating oven, used to be installed on the transmission path at the outlet of the coating oven, comprising:

[0007] Base;

[0008] A pair of lifting and adjusting mechanisms, wherein the lifting and adjusting mechanisms are mounted on the base;

[0009] A pair of connecting brackets, the connecting brackets being mounted on the lifting and adjusting mechanism;

[0010] A reflector lampshade assembly is mounted on the connecting bracket. The reflector lampshade assembly includes a reflector lampshade unit, and the reflector lampshade unit has a lamp tube mounting cavity extending along the length direction.

[0011] An infrared lamp assembly, comprising multiple infrared lamps, wherein the infrared lamps are detachably installed inside the lamp mounting cavity;

[0012] A light-shielding device is installed at the open end of the reflective lampshade assembly, and the light-shielding device is provided with a light-shielding plate that is suitable for moving along the length direction of the reflective lampshade assembly;

[0013] The reflector assembly is adapted to adjust its height relative to the base via the lifting adjustment mechanism.

[0014] Furthermore, a specific structure for a lifting and adjusting mechanism is provided, the lifting and adjusting mechanism comprising:

[0015] A lower bracket, which is mounted on the base;

[0016] An upper bracket is adjustablely mounted on a lower bracket. At least one of the upper bracket and the lower bracket is provided with an arc-shaped guide groove, and the corresponding end of the other bracket is provided with a connecting hole.

[0017] A fixing mechanism that passes through the connecting hole and engages with the arc-shaped guide groove;

[0018] The connecting bracket is a telescopic rod, which is hinged to the upper end of the upper bracket, and the reflector lampshade assembly is installed at the free end of the telescopic rod.

[0019] Furthermore, the reflector assembly includes a pair of reflector units arranged side by side, and the inner wall of the reflector unit is provided with a reflective coating extending along the length direction.

[0020] Furthermore, the reflective coating is a gold-plated reflective coating.

[0021] Furthermore, the infrared lamp assembly is a mid-wave infrared lamp assembly with a wavelength of 2-4μm.

[0022] Furthermore, the light-shielding device includes:

[0023] A pair of guide rods, the guide rods being mounted on the reflector assembly;

[0024] The light-shielding plate is detachably mounted on the guide rod, and the light-shielding plate is adapted to slide along the guide rod.

[0025] Furthermore, the width of the light-shielding plate is 1 cm.

[0026] Furthermore, the infrared heat compensation device for the lithium battery negative electrode coating oven also includes a heat preservation control mechanism, which includes:

[0027] A temperature sensing device is installed at a predetermined distance along the transmission path at the outlet of the coating oven.

[0028] A controller, which is connected to the temperature sensing device and the infrared lamp assembly, respectively.

[0029] The controller is adapted to receive the temperature signal emitted by the temperature sensing device and control the switching of the infrared lamp group according to the temperature signal.

[0030] By adopting the above technical solution, this utility model has the following beneficial effects:

[0031] In this invention, during operation, the lifting and adjusting mechanism adjusts the height of the reflector lampshade assembly relative to the base, enabling the reflector lampshade assembly to adapt to the heating requirements of electrode sheets of different thicknesses. The connecting bracket connects the lifting and adjusting mechanism to the reflector lampshade assembly. The infrared lamp tube group inside the reflector lampshade assembly generates infrared radiation to supplement the heating of the electrode sheets. The light-shielding device adjusts the movement of the light-shielding plate to block areas that do not need to be heated, thereby achieving uniform supplementary heating of the electrode sheets and reducing the cracking rate of the electrode sheets.

[0032] The lifting and adjusting mechanism can adapt to the processing needs of electrode sheets of different specifications; the reflective lamp cover assembly is equipped with a gold-plated reflective coating, which can focus infrared radiation onto the surface of the electrode sheet and improve the utilization rate of radiation energy; the light shield of the light shielding device has a width of 1cm and can slide along the guide rod, and can be used in combination to cover protection areas of different widths.

[0033] In summary, this utility model, through the modular structural design of the infrared heating device, solves the technical problems of insufficient drying capacity and electrode cracking in traditional ovens, realizes the supplementary heating of coated electrodes for lithium battery negative electrodes, improves coating quality and production efficiency, and has the beneficial effects of reasonable structure, convenient use and strong applicability. Attached Figure Description

[0034] Figure 1 This is a three-dimensional structural diagram of the infrared heating device for the lithium battery negative electrode coating oven of this utility model. Figure 1 ;

[0035] Figure 2 for Figure 1 A magnified view of part A in the middle;

[0036] Figure 3 This is a three-dimensional structural diagram of the infrared heating device for the lithium battery negative electrode coating oven of this utility model. Figure 2 ;

[0037] Figure 4 for Figure 3 A magnified view of part B in the middle section. Detailed Implementation

[0038] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0039] like Figure 1-4 As shown, an external infrared temperature compensation device for a lithium battery negative electrode coating oven is installed on the transmission path at the outlet of the coating oven, comprising:

[0040] Base 1;

[0041] A pair of lifting and adjusting mechanisms 2 are mounted on the base 1;

[0042] A pair of connecting brackets 3 are mounted on the lifting and adjusting mechanism 2;

[0043] The reflector assembly 4 is mounted on the connecting bracket 3. The reflector assembly 4 includes a reflector unit, which has a lamp tube mounting cavity extending along the length direction.

[0044] Infrared lamp assembly 5, which includes multiple infrared lamps, is detachably installed inside the lamp mounting cavity.

[0045] The light-shielding device 6 is installed at the open end of the reflector lampshade assembly 4. The light-shielding device 6 is provided with a light-shielding plate 61 that is suitable for moving along the length direction of the reflector lampshade assembly 4.

[0046] The reflector lampshade assembly 4 is adapted to adjust its height relative to the base 1 via the lifting adjustment mechanism 2.

[0047] In this embodiment, as Figure 1 and Figure 3As shown, during operation, the lifting adjustment mechanism 2 adjusts the height of the reflector lamp cover assembly 4 relative to the base 1, enabling the reflector lamp cover assembly 4 to adapt to the heating requirements of electrode sheets of different thicknesses. The connecting bracket 3 connects the lifting adjustment mechanism 2 to the reflector lamp cover assembly 4. The infrared lamp tube group 5 inside the reflector lamp cover assembly 4 generates infrared radiation to supplement the heating of the electrode sheet. The light shielding device 6 adjusts the movement of the light shielding plate 61 to shield the area that does not need to be heated, thereby achieving uniform supplementary heating of the electrode sheet and reducing the cracking rate of the electrode sheet.

[0048] Specifically, such as Figure 1-2 As shown, the lifting adjustment mechanism 2 includes:

[0049] Lower bracket 21, which is mounted on base 1;

[0050] The upper bracket 22 is adjustablely mounted on the lower bracket 21. At least one of the upper bracket 22 and the lower bracket 21 is provided with an arc-shaped guide groove 23, and the corresponding end of the other is provided with a connecting hole 24.

[0051] Fixing mechanism 25 passes through connecting hole 24 and engages with arc-shaped guide groove 23;

[0052] Among them, the connecting bracket 3 is a telescopic rod, which is hinged to the upper end of the upper bracket 22, and the reflector lampshade assembly 4 is installed on the free end of the telescopic rod.

[0053] In this embodiment, as Figure 1-2 As shown, both the lower bracket 21 and the upper bracket 22 are provided with arc-shaped guide grooves and connecting holes. Two fixing mechanisms 25 pass through the corresponding connecting holes and cooperate with the arc-shaped guide grooves. Specifically, the lower bracket 21 is provided with a connecting hole 24, and the upper bracket 22 is provided with an arc-shaped guide groove 23. The first fixing mechanism 25 passes through the connecting hole 24 and cooperates with the arc-shaped guide groove 23. At the same time, the upper bracket 22 is also provided with another connecting hole, and the lower bracket 21 is also provided with another arc-shaped guide groove. The second fixing mechanism passes through this connecting hole and cooperates with this arc-shaped guide groove.

[0054] The working process of the lifting and adjusting mechanism 2 is as follows: The operator simultaneously loosens the two fixing mechanisms 25, causing them to disengage from the corresponding arc-shaped guide groove. At this time, the upper bracket 22 can move in an arc shape relative to the lower bracket 21 along the arc-shaped guide groove. By adjusting the position of the upper bracket 22 in the arc-shaped guide groove, the height of the upper bracket 22 relative to the lower bracket 21 is changed. After reaching the desired position, the two fixing mechanisms 25 are tightened again, so that the connecting hole and the arc-shaped guide groove are re-fixed. The connecting bracket 3 serves as a telescopic rod structure. One end of it is connected to the upper end of the upper bracket 22 by a hinge, and the other end is fixedly installed with the reflector lampshade assembly 4. By adjusting the length of the telescopic rod, the lateral position of the reflector lampshade assembly 4 can be further adjusted.

[0055] In this embodiment, both the lower bracket 21 and the upper bracket 22 are provided with arc-shaped guide grooves 23 and connecting holes 24, and two fixing mechanisms 25 are also provided.

[0056] In this embodiment, the fixing mechanism 25 is a bolt and nut combination, but in other embodiments it can also be a quick-release handle, a buckle or other fasteners.

[0057] Specifically, such as Figure 1 As shown, the reflector assembly 4 includes a pair of reflector units arranged side by side, and the inner wall of the reflector unit is provided with a reflective coating extending along the length direction.

[0058] Specifically, the reflective coating is a gold-plated reflective coating.

[0059] Specifically, such as Figure 3 As shown, infrared lamp group 5 is a mid-wave infrared lamp group with a wavelength of 2-4μm.

[0060] In this embodiment, as Figure 1 and Figure 3 As shown, the two reflective lampshade units of the reflective lampshade assembly 4 are arranged side by side along the electrode transmission direction. Each reflective lampshade unit has a semi-circular or parabolic reflective cavity inside. The reflective coating is formed into a uniform metal thin film layer on the inner wall surface of the reflective lampshade unit through an electroplating process. When the infrared lamp tube assembly 5 is working, infrared radiation energy is emitted in all directions. Among them, the infrared radiation emitted upward and laterally is reflected by the reflective coating and refocused onto the electrode surface, reducing the loss of radiation energy.

[0061] The 2-4μm wavelength infrared light emitted by the infrared lamp tube group 5 resonates and absorbs with the molecular vibration frequency of water molecules. The infrared lamp tubes and the reflector unit are detachably connected, allowing for quick replacement via plug-in power connection. The specific plug-in structure is a snap-on lamp holder, which is existing technology and will not be described in detail in this embodiment.

[0062] In other embodiments, the number of reflector units is not limited to a pair and can be set according to the specific electrode width and heating requirements. The power and number of infrared lamps can be configured according to different drying process requirements.

[0063] Specifically, such as Figure 1 and Figure 4 As shown, the light-shielding device 6 includes:

[0064] A pair of guide rods 62 are mounted on the reflector lampshade assembly 4;

[0065] The light-shielding plate 61 is detachably mounted on the guide rod 62, and the light-shielding plate 61 is adapted to slide along the guide rod 62.

[0066] Specifically, such as Figure 1-2As shown, the width of the light-shielding plate 61 is 1 cm.

[0067] In this embodiment, as Figure 1 and Figure 4 As shown, guide rods 62 extend along the length of the reflector assembly 4. Two guide rods 62 are installed parallel to each other on both sides of the opening end of the reflector assembly 4, and the guide rods 62 are fixed to the reflector assembly 4. A light-shielding plate 61 has a sliding groove that mates with the guide rods 62. It is fitted onto the guide rods 62 and can slide freely along the length of the guide rods 62 to the desired position. Operators can combine multiple light-shielding plates 61 on the guide rods 62 according to the requirements of different width electrode products, and can block areas that do not need heating by adjusting the position and number of the light-shielding plates 61.

[0068] When the infrared lamp assembly 5 is working, the light-shielding plate 61 can block infrared radiation from directly hitting the blank and thinned areas of the electrode sheet. The 1cm width of each light-shielding plate 61 allows for combined use, and multiple light-shielding plates 61 arranged side by side can cover protective areas of different widths. The light-shielding plate 61 and the guide rod 62 are in a sliding fit, and the position can be manually adjusted without tools.

[0069] In other embodiments, the width of the light-shielding plate 61 is not limited to 1 cm, and can be set to different widths according to specific protection requirements. In addition to round rods, the guide rod 62 can also be a square rod or a guide rail structure in other embodiments, and the light-shielding plate 61 is provided with a matching sliding structure accordingly.

[0070] Specifically, such as Figure 3 As shown, the infrared heating device outside the lithium battery negative electrode coating oven also includes a heat preservation control mechanism, which includes:

[0071] A temperature sensing device is installed at a preset distance along the transmission path at the outlet of the coating oven.

[0072] The controller is connected to the temperature sensing device and the infrared lamp group 5 respectively;

[0073] The controller is adapted to receive temperature signals from the temperature sensing device and control the switching of the infrared lamp group 5 according to the temperature signals.

[0074] In this embodiment, as Figure 3As shown, a temperature sensor is installed 10cm from the electrode surface and fixed above the transmission path by a bracket. It detects the surface temperature of the passing electrode in real time and transmits the temperature signal to the controller. The controller has a target temperature value set internally. The controller's operation is as follows: it receives the real-time temperature signal from the temperature sensor and compares it with the preset target temperature value. When the detected electrode surface temperature is lower than the set temperature, the controller outputs a control signal to power on the infrared lamp assembly 5 for heating. When the detected electrode surface temperature reaches or exceeds the set temperature, the controller switches to a heat preservation mode, maintaining a constant power output by intermittently controlling the power supply to the infrared lamp assembly 5, thus keeping the electrode surface temperature within the set range.

[0075] In this embodiment, the temperature sensing device is an infrared temperature sensor, and the controller is a PLC controller. In other embodiments, the temperature sensing device may also be a thermocouple or a resistance temperature detector (RTD) sensor, and the controller may also be a microcontroller or an industrial control computer.

[0076] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An external infrared temperature compensation device for a lithium battery negative electrode coating oven, used for installation on the transmission path at the outlet of the coating oven, characterized in that, include: Base (1); A pair of lifting adjustment mechanisms (2) are mounted on the base (1); A pair of connecting brackets (3) are mounted on the lifting and adjusting mechanism (2); A reflector lampshade assembly (4) is mounted on the connecting bracket (3). The reflector lampshade assembly (4) includes a reflector lampshade unit, which has a lamp tube mounting cavity extending along the length direction. Infrared lamp tube group (5), the infrared lamp tube group (5) includes multiple infrared lamp tubes, the infrared lamp tubes are detachably installed inside the lamp tube mounting cavity; A light-shielding device (6) is installed at the opening end of the reflective lampshade assembly (4), and the light-shielding device (6) is provided with a light-shielding plate (61) suitable for moving along the length direction of the reflective lampshade assembly (4). The reflector assembly (4) is adapted to adjust its height relative to the base (1) via the lifting adjustment mechanism (2).

2. The infrared heating device for coating the negative electrode of a lithium battery according to claim 1, characterized in that, The lifting and adjusting mechanism (2) includes: The lower bracket (21) is mounted on the base (1); The upper bracket (22) is adjustablely mounted on the lower bracket (21). At least one of the upper bracket (22) and the lower bracket (21) is provided with an arc-shaped guide groove (23), and the corresponding end of the other is provided with a connecting hole (24). A fixing mechanism (25) passes through the connecting hole (24) and engages with the arc-shaped guide groove (23); The connecting bracket (3) is a telescopic rod, which is hinged to the upper end of the upper bracket (22), and the reflector lampshade assembly (4) is installed at the free end of the telescopic rod.

3. The infrared temperature compensation device for lithium battery negative electrode coating oven according to claim 1, characterized in that, The reflector assembly (4) includes a pair of reflector units arranged side by side, the inner wall of which is provided with a reflective coating extending along the length direction.

4. The infrared heating device for coating the negative electrode of a lithium battery according to claim 3, characterized in that, The reflective coating is a gold-plated reflective coating.

5. The infrared temperature compensation device for lithium battery negative electrode coating oven according to claim 1, characterized in that, The infrared lamp group (5) is a mid-wave infrared lamp group with a wavelength of 2-4μm.

6. The infrared heating device for coating the negative electrode of a lithium battery according to claim 1, characterized in that, The light-shielding device (6) includes: A pair of guide rods (62) are mounted on the reflector assembly (4); The light-shielding plate (61) is detachably mounted on the guide rod (62), and the light-shielding plate (61) is adapted to slide along the guide rod (62).

7. The infrared heating device for coating the negative electrode of a lithium battery according to claim 1, characterized in that, The width of the light-shielding plate (61) is 1 cm.

8. The infrared heating device for coating the negative electrode of a lithium battery according to claim 1, characterized in that, It also includes a thermal insulation control mechanism, which comprises: A temperature sensing device is installed at a predetermined distance along the transmission path at the outlet of the coating oven. The controller is connected to the temperature sensing device and the infrared lamp group (5) respectively; The controller is adapted to receive the temperature signal emitted by the temperature sensing device and control the switching of the infrared lamp group (5) according to the temperature signal.

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