A battery cell heating device

Abstract

The present invention relates to the technical field of lithium battery production, and particularly relates to a battery cell heating device, which includes a fixing part and a conveying part. The conveying part conveys the battery cells along a first direction; a first microwave suppressor is fixedly arranged on the fixing part, and the first microwave suppressor surrounds the conveying part to form a heating cavity. A heating element is built in the first microwave suppressor, and a plurality of heating elements are fixedly arranged on the fixing part along the first direction; a first fan, a plurality of first fans built in the first microwave suppressor are fixedly arranged on the fixing part along the first direction. The first fan is configured to form a two-way air flow channel along a second direction. A plurality of first ventilation holes are opened on the side wall of the first microwave suppressor close to the first fan. In this application, the microwave heating element built in the first microwave suppressor directly acts on the inside of the battery cell, so that the inside of the battery cell is uniformly heated. At the same time, the first fan is arranged along the conveying direction, so that hot air flows efficiently in the heating cavity and uniformly covers the outside of the battery cell, significantly reducing the temperature difference between the inside and the outside of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a battery core heating device. Background Art

[0002] In the field of battery manufacturing and processing technology, the performance of the battery cell, as the core unit of the energy storage system, is closely related to the manufacturing process. In order to ensure that the battery cell has good structural stability and electrical connectivity in subsequent packaging, assembly and other processes, it is usually necessary to make the battery cell reach a specific hot-pressing state, that is, to achieve a close fit between the pole piece and the diaphragm through the hot pressing process, eliminate internal bubbles or gaps, and improve the overall consistency of the battery. However, the traditional method of directly heating the battery cell through a heat source has significant technical bottlenecks:

[0003] Since the battery cell is composed of multiple layers of positive and negative electrode materials, electrolyte, diaphragm and other complex structures, direct heating by heat source can easily lead to uneven temperature distribution. Local overheating may cause electrolyte decomposition, diaphragm shrinkage or electrode material structural damage, thereby affecting the electrochemical performance and safety of the battery. In addition, direct contact of the heat source with the battery cell may also cause uneven stress inside the battery cell due to the difficulty in accurately controlling the heating rate, increasing the risk of cycle life attenuation of the battery after packaging. Summary of the invention

[0004] The purpose of the present invention is to provide a battery core heating device to solve the problem in the prior art that direct heat source heating of the battery core leads to uneven battery core temperature.

[0005] The technical solution of the present invention is: a battery core heating device, comprising: a conveyor belt, comprising a fixed part and a conveying part, the conveying part conveys the battery core along a first direction; a first microwave suppressor, fixedly arranged on the fixed part, the first microwave suppressor surrounds the conveying part to form a heating cavity, the first microwave suppressor is provided with an input hole and an output hole for unidirectional conveying of the battery core along the first direction; a heating element, built into the first microwave suppressor, a plurality of heating elements are fixedly arranged on the fixed part along the first direction, and are used for microwave heating of the battery core entering the first microwave suppressor; a first fan, a plurality of first fans built into the first microwave suppressor are fixedly arranged on the fixed part along the first direction, the first fan is located on the side of the heating element away from the conveying part, the first fan is configured as a bidirectional airflow channel along the second direction, and a plurality of first ventilation holes are provided on the side wall of the first microwave suppressor close to the first fan.

[0006] Preferably, the heating chamber is divided into a heat treatment chamber and a temperature adjustment chamber which are interconnected along the second direction, the temperature adjustment chamber is located above the conveying part, the heat treatment chamber is formed by extending the first microwave suppressor along the second direction, and constitutes an independent heating space protruding outside the conveying part, and the heating element and the first fan are both arranged in the heat treatment chamber.

[0007] Preferably, a partition is fixedly arranged inside the first microwave suppressor. The partition is higher than the top of the conveying part. The partition divides the heat treatment cavity into an upper second cavity and a lower first cavity. The partition is provided with a plurality of second fans and a plurality of power supplies. Both the second fans and the power supplies are arranged inside the second cavity. The second fans are configured to form a two-way air flow channel in the second direction. The side wall of the first microwave suppressor is provided with second ventilation holes. The second fans are located on the side of the power supply close to the temperature control cavity.

[0008] Preferably, an air pipe is arranged at the top of the first microwave suppressor. The air pipe is connected to a fan. The first microwave suppressor is fixedly provided with a sensor for detecting the temperature inside the heating cavity.

[0009] Preferably, a third microwave suppressor and a second microwave suppressor are fixedly arranged on the conveyor belt. Both the third microwave suppressor and the second microwave suppressor surround the conveying part. The third microwave suppressor is communicated with the input hole of the first microwave suppressor. The second microwave suppressor is communicated with the output hole of the first microwave suppressor. The third microwave suppressor, the first microwave suppressor and the second microwave suppressor form a channel through which the power supply core passes. The cross-sectional area of the cavity of the third microwave suppressor and the cross-sectional area of the cavity of the second microwave suppressor are both smaller than the cross-sectional area of the cavity of the first microwave suppressor.

[0010] Preferably, the temperature control cavity includes an upper cavity and a lower cavity which are vertically communicated. The first cavity is horizontally communicated with the lower cavity. The second cavity is horizontally communicated with the upper cavity. The conveying part is located in the lower cavity.

[0011] Preferably, an observation window is rotatably connected to the side wall of the first microwave suppressor. A metal mesh is fixedly arranged on the observation window. The inner wall of the first microwave suppressor is made of heat-conducting metal.

[0012] Preferably, an adjusting assembly and a guiding strip are arranged at the output end of the conveyor belt. The adjusting assembly is adjustably arranged in the second direction and the vertical direction on the fixing part. The guiding strip is fixedly arranged at the output end of the adjusting assembly. The guiding strip is located at the tail of the conveying part.

[0013] Preferably, the adjusting assemblies are arranged in pairs on both sides of the conveying part. The guiding strips are arranged in pairs on the top of the conveying part. The two guiding strips form a channel for positioning the power supply core in the first direction.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] Through the coordination of microwave heating and fan air flow, the problem of uneven temperature of the battery cells caused by traditional heat source heating is effectively solved. The microwave heating element built into the first microwave suppressor directly acts on the inside of the battery cells, causing the inside of the battery cells to heat up evenly. At the same time, the first fan is arranged along the conveying direction to form a two-way air flow channel. In cooperation with the ventilation holes on the side wall of the first microwave suppressor, hot air flows efficiently in the heating cavity and evenly covers the outside of the battery cells. This way of synchronous internal and external heating significantly reduces the temperature difference between the inside and outside of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments:

[0017] Figure 1 is a schematic structural diagram of a battery cell heating device according to the present invention;

[0018] Figure 2 is a schematic diagram of the internal structure of the heating cavity according to the present invention;

[0019] Figure 3 is a schematic diagram of the internal structure of the heat treatment cavity according to the present invention;

[0020] Figure 4 is a schematic diagram of the internal structure of the temperature adjustment cavity according to the present invention;

[0021] Figure 5 is a schematic structural diagram of the positioning mechanism according to the present invention.

[0022] DESCRIPTION OF THE REFERENCE NUMERALS:

[0023] 1. Conveyor belt; 11. Fixed part; 12. Conveying part; 2. First microwave suppressor; 21. Heating cavity; 211. Temperature adjustment cavity; 2111. Upper cavity; 2112. Lower cavity; 212. Heat treatment cavity; 2121. First cavity; 2122. Second cavity; 22. Air pipe; 23. First fan; 24. Second fan; 25. First ventilation hole; 26. Second ventilation hole; 27. Input hole; 28. Output hole; 31. Heating element; 32. Transformer; 33. Power supply; 34. Partition board; 35. Support platform; 36. Sensor; 41. Blower; 51. Third microwave suppressor; 52. Second microwave suppressor; 6. Positioning mechanism; 61. Adjusting component; 611. First adjusting seat; 612. First adjusting rod; 613. First adjusting knob; 614. Second adjusting seat; 615. Second adjusting knob; 616. Second adjusting rod; 62. Guide bar; 63. Limit block; 71. Observation window; 72. Metal mesh; 100. Battery cell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work fall within the scope of protection of the present invention.

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0027] As Figure 1 and Figure 2 shown, a battery cell heating device includes a conveyor belt 1 and a first microwave suppressor 2. The conveyor belt 1 includes a fixed part 11 and a conveying part 12, and the conveying part 12 conveys the battery cell 100 in a first direction. The first microwave suppressor 2 is fixedly arranged on the fixed part 11, and the first microwave suppressor 2 surrounds the conveying part 12 to form a heating cavity 21. A heating element 31 is arranged in the heating cavity 21 for heating the battery cell 100 in the first microwave suppressor 2. The first microwave suppressor 2 is provided with an input hole 27 and an output hole 28 for unidirectional conveying of the battery cell 100 along the first direction. During the process of the battery cell 100 moving from one end of the conveyor belt 1 to the other end, the battery cell 100 is heated in the heating cavity 21, so that the battery cell 100 reaches a state where it can be hot-pressed.

[0028] In this embodiment, the conveyor belt 1 is a chain plate line. Preferably, the conveyor belt 1 is a metal chain plate line, that is, the metal chain plate line is a metal chain conveyor, that is, the conveying part 12 is a heat-conducting metal. The high heat conductivity of the metal chain plate enables the battery cell 100 to maintain heat exchange with the chain plate during the conveying process, reducing local temperature fluctuations and avoiding too large a temperature difference between the surface and the inside of the battery cell 100 due to excessive heat dissipation. In other embodiments, the conveyor belt 1 can use a metal mesh belt 72 or a carbon fiber composite conveyor belt 1 to convey the battery cell 100.

[0029] In this embodiment, the fixing portion 11 extends in the second direction to form a support platform 35, so that the heating chamber 21 is not limited to the cavity at the top of the conveying portion 12, but also covers the space at the top of the support platform 35. The heating chamber 21 is divided into a heat treatment chamber 212 and a temperature adjustment chamber 211 that communicate with each other along the second direction. The temperature adjustment chamber 211 is located above the conveying portion 12, and the heat treatment chamber 212 is located on the top of the support platform 35.

[0030] A plurality of first fans 23 are fixedly provided on the support platform 35. The plurality of first fans 23 are configured as a two-way air flow channel along the second direction to control the air flow to flow bidirectionally along the second direction. It should be noted that "bidirectional flow" means that the air flow flows in the positive direction along the second direction, or the air flow flows in the reverse direction along the second direction. The plurality of first fans 23 are evenly distributed along the first direction, the heating elements 31 are evenly distributed along the first direction, the plurality of first fans 23 generate an air curtain in the first direction, and the plurality of first fans 23 cooperate with the plurality of heating elements 31 to continuously heat the battery cell 100 along the first direction. Preferably, the first fans 23 and the heating elements 31 are in one-to-one correspondence. A plurality of first ventilation holes 25 are provided on the side wall of the first microwave suppressor 2. Preferably, the first ventilation holes 25 are provided on the side wall of the first microwave suppressor 2 that is close to the first fans 23 along the second direction.

[0031] Preferably, the two-way air flow channel formed by the first fans 23 can adopt a fan with two-way blowing. More preferably, the blowing direction of some of the first fans 23 is the positive direction along the second direction, and the blowing direction of the other part of the first fans 23 is the reverse direction along the second direction. The first fans 23 with blowing in two directions are arranged alternately. The heat treatment chamber 212 and the temperature adjustment chamber 211 communicate with each other in the second direction. In order to quickly change the temperature rise in the temperature adjustment chamber 211, preferably, the heat treatment chamber 212 and the temperature adjustment chamber 211 are separated by a metal mesh 72 or a perforated metal plate. When the first fans 23 blow towards the first ventilation holes 25, the first fans 23 dissipate heat from the heating elements 31 and slow down the air flow generated inside the temperature adjustment chamber 211 due to gas expansion; when the first fans 23 blow in the direction away from the first ventilation holes 25, the air flow in the temperature adjustment chamber 211 is promoted.

[0032] Such as Figure 2 and Figure 3As shown in the figure, a plurality of transformers 32 and a plurality of power supplies 33 are fixedly provided on the bearing platform, and the power supply 33, the transformer 32 and the heating element 31 are electrically connected. In this embodiment, the heating element 31 is a magnetron. While the magnetron heats the battery cell 100 through microwaves, the magnetron itself also generates heat. The heat generated by the magnetron itself is approximately 40% - 70% of the microwave energy it generates. The transformer 32 boosts the 220V voltage generated by the power supply 33 to high voltage and inputs it into the magnetron. The magnetron generates high-power microwaves, and the microwaves heat the battery cell 100 in the temperature control chamber 211. The microwaves directly act on the polar molecules (such as electrolyte, binder, etc.) inside the battery cell 100, heating from the inside of the battery cell 100, so that the battery cell 100 (after winding / laminating) gradually reaches the target temperature, softens the diaphragm, and makes the electrode sheets fit more tightly, facilitating subsequent hot pressing and shaping. Preferably, a part of the bearing platform is lower than the conveying part 12, and the heating element 31 fixedly provided on the bearing platform heats the conveying part 12 and the battery cell 100 on the conveying part 12, and the conveying part 12 pre-heats the battery cell 100. Preferably, the heating of the battery cell 100 slightly exceeds the target temperature to ensure that the battery cell 100 is at the target temperature when it reaches the hot pressing process.

[0033] A partition plate 34 is provided inside the first microwave suppressor 2. The partition plate 34 is located in the heat treatment chamber 212. The outer peripheral side of the partition plate 34 is fixedly connected to the inner wall of the first microwave suppressor 2. The partition plate 34 is higher than the top of the conveying part 12, and the partition plate 34 does not extend to the temperature control chamber 211. Preferably, the partition plate 34 is horizontally arranged. The partition plate 34 divides the heat treatment chamber 212 into a second chamber 2122 and a first chamber 2121 along the up and down directions. The first air pipe 22 is communicated with the first chamber 2121, that is, the first air pipe 22 is communicated with the temperature control chamber 211 through the first chamber 2121. The temperature control chamber 211 includes an upper chamber 2111 and a lower chamber 2112 that are vertically communicated. The first chamber 2121 is horizontally communicated with the lower chamber 2112 along the second direction, and the second chamber 2122 is horizontally communicated with the upper chamber 2111 along the second direction. The conveying part 12 is located at the bottom near the lower chamber 2112, and the heating element 31 is close to the conveying part 12. The first fan 23 blows the heat generated by the heating element 31 itself towards the battery cell 100 in the form of hot air.

[0034] A plurality of second fans 24 are fixedly provided on the partition plate 34. A plurality of power supplies 33 are fixedly provided on the partition plate 34, and both the second fans 24 and the power supplies 33 are built in the second chamber 2122, that is, the second fans 24 and the power supplies 33 are placed in the upper layer. The plurality of second fans 24 are arranged in an array along the first direction, and the plurality of power supplies 33 are arranged in an array along the first direction. The second fans 24 are located on the side of the power supplies 33 close to the temperature control chamber 211. The plurality of power supplies 33 are fixedly provided on the partition plate 34 along the first direction, and the plurality of heating elements 31 are fixedly provided on the bearing platform along the first direction. Preferably, the second fans 24 and the power supplies 33 correspond one by one along the second direction.

[0035] A plurality of second fans 24 are configured for a two-way air flow channel in the second direction, that is, the second fans 24 blow air in the forward or reverse direction along the second direction. In this embodiment, the second fans 24 are axial fans, and the second fans 24 blow air unidirectionally. A plurality of second fans 24 are alternately arranged in part of the blowing directions along the first direction, that is, some of the second fans 24 blow air in the forward direction of the second direction, and some of the second fans 24 blow air in the direction towards the second direction. In other embodiments, the second fans 24 adopt double impeller reverse fans or electromagnetic drive swing blade fans to blow air in two directions along the second direction. A plurality of second ventilation holes 26 are formed in the side wall of the first microwave suppressor 2, and the plurality of second ventilation holes 26 are arranged in an array. Preferably, the conduction direction of the second ventilation holes 26 is the second direction.

[0036] An air pipe 22 and a blower 41 are formed in the top of the first microwave suppressor 2. The air pipe 22 communicates with the heating chamber 21 and the blower 41, and the blower 41 adsorbs and collects harmful substances generated in the temperature control chamber 211. The first microwave suppressor 2 is provided with a sensor 36 for detecting the temperature in the heating chamber 21. Preferably, the sensor 36 detects the temperature of the upper chamber 2111. More preferably, the sensor 36 detects the temperature of the lower chamber 2112. In this embodiment, the first fan 23, the second fan 24, the sensor 36 and the blower 41 are controlled by a control system (not shown in the figure) to control the temperature inside the heating chamber 21.

[0037] In this embodiment, the inner wall of the first microwave suppressor 2 is made of heat-conducting metal to eliminate local hot spots or cold spots inside the first microwave suppressor 2 and ensure uniform temperature distribution. The metal inner wall and the air inside the box transfer heat through natural convection and radiation to enhance the passive heat exchange efficiency. An observation hole communicating with the temperature control chamber 211 is formed in the side wall of the first microwave suppressor 2. The first microwave suppressor 2 is rotatably connected with an observation window 71 for an operator to observe the state of the battery cell 100. Specifically, the frame of the observation window 71 is made of heat-conducting metal, and the middle of the observation window 71 is made of glass for an operator to visually observe. A metal mesh 72 is fixedly arranged inside the observation window 71 to improve the temperature radiation efficiency inside the temperature control chamber 211.

[0038] Such as Figure 4As shown, the conveyor belt 1 is fixedly provided with a third microwave suppressor 51 and a second microwave suppressor 52. The third microwave suppressor 51 is connected to the input end of the first microwave suppressor 2, and the second microwave suppressor 52 is connected to the output end of the first microwave suppressor 2. The third microwave suppressor 51 surrounds the conveying part 12 to form a first heat preservation cavity, and the second microwave suppressor 52 surrounds the conveying part 12 to form a second heat preservation cavity. The third microwave suppressor 51, the heating box and the second microwave suppressor 52 are connected in the first direction to form a channel for heating the battery cell 100. Specifically, the cross-sectional area of the cavity of the third microwave suppressor 51 and the cross-sectional area of the cavity of the second microwave suppressor 52 are both smaller than the cross-sectional area of the cavity of the first microwave suppressor 2. Preferably, both the third microwave suppressor 51 and the second microwave suppressor 52 are directly connected to the lower cavity 2112, and both the third microwave suppressor 51 and the second microwave suppressor 52 are indirectly connected to the upper cavity 2111 through the lower cavity 2112.

[0039] In this embodiment, the cross-section of the cavity of the third microwave suppressor 51 is a rectangular strip-shaped channel, and the cross-section of the cavity of the second microwave suppressor 52 is a rectangular strip-shaped channel. That is, the cross-sectional area of the cavity of the third microwave suppressor 51 and the cross-sectional area of the cavity of the second microwave suppressor 52 remain unchanged in the first direction. In other embodiments, the cross-sectional areas of the cavities of the third microwave suppressor 51 and the second microwave suppressor 52 both gradually decrease in the direction away from the temperature control cavity 211. By reducing the cross-sectional area, the air flow velocity is increased, and the convective heat transfer efficiency is enhanced.

[0040] The third microwave suppressor 51 and the temperature control cavity 211 form a gradually increasing temperature area. The battery cell 100 enters the third microwave suppressor 51 for preheating, and then enters the temperature control cavity 211 for continuous clamping. The temperature gradually rises in the third microwave suppressor 51. The expansion coefficients of the various layers of materials (positive electrode / diaphragm / negative electrode) inside the lithium battery cell 100 are different, and the gradually increasing temperature can reduce the interlayer shear stress.

[0041] The second microwave suppressor 52 and the temperature control cavity 211 form a gradually decreasing temperature area. After the battery cell 100 is heated in the temperature control cavity 211, it passes through the second microwave suppressor 52, and the temperature gradually decreases, thereby avoiding the risk of internal stress concentration in the materials that may be caused by direct rapid cooling after high-temperature heating. For example, it avoids the risk of delamination between electrode layers or cracking of the ceramic electrolyte, enables materials with different thermal expansion coefficients to contract in coordination, and reduces the thermal stress.

[0042] It should be clarified that in the structure involved in this embodiment, the direction is defined as follows: the direction determined along the running trajectory of the conveyor belt is defined as the first direction, and the direction perpendicular to the first direction is defined as the second direction. In this embodiment, the first direction and the second direction are both on the same horizontal plane, wherein the positive direction of the second direction is set to the direction in which the air outlet direction of the first fan 23 points to the heating element 31; correspondingly, the reverse direction of the second direction is the direction in which the air outlet direction of the second fan 24 points to the first ventilation hole 25.

[0043] This embodiment has multiple temperature control methods, and two temperature control methods are shown here as examples, but are not limited to the specific implementation methods described in this embodiment:

[0044] Temperature control method 1:

[0045] The heating element 31 heats the conveying portion 12, and due to the radiation heat in the first microwave suppressor 2, the conveying portion 12 has a higher temperature than the outside, and the temperature of the space inside the third microwave suppressor 51, the first microwave suppressor 2 and the second microwave suppressor 52 is higher than the outside temperature. The battery cell 100 is placed in the conveying portion 12, and the conveying portion 12 passes through the third microwave suppressor 51, the first microwave suppressor 2 and the second microwave suppressor 52 in sequence at a uniform speed. The conveyor belt preheats the battery cell 100 through heat conduction, and the third microwave suppressor 51 preheats the surface of the battery cell 100, so that the temperature of the surface of the battery cell 100 is slightly higher than the temperature inside the battery cell 100. When the battery cell 100 enters the temperature control cavity, the heating element 31 performs microwave heating on the battery cell 100, so that the internal and surface temperatures of the battery cell 100 reach a balanced heating state.

[0046] When the battery cell 100 passes through the temperature adjustment chamber 211, the heating element 31 performs microwave heating on the battery cell 100, and the interior of the battery cell 100 is heated first. Since the battery cell 100 passes through the third microwave suppressor 51 and the preheating of the conveyor belt, the surface temperature of the battery cell 100 before heating is slightly higher than the internal temperature. When the interior of the battery cell 100 is heated up and the surface heat is heated up by conduction, the overall temperature of the battery cell 100 is more balanced. In this process, the first fan 23 blows air in the positive direction of the second direction, that is, the first fan 23 blows air toward the heating element 31, and blows the heat generated by the heating element 31 itself to the lower chamber 2112 of the temperature adjustment chamber 211, thereby heating the interior of the temperature adjustment chamber 211 and directly heating the battery cell 100. The hot air flows from the lower chamber 2112 to the third microwave suppressor 51 and the second microwave suppressor 52, and heats the interior of the third microwave suppressor 51 and the second microwave suppressor 52.

[0047] The second fan 24 blows air in the reverse direction of the second direction, that is, the second fan 24 blows air towards the power supply 33. On the one hand, the second fan 24 generates a negative pressure on the upper cavity 2111, and the moisture and other volatile gases in the heating cavity 21 flow upward under the influence of the negative pressure. The fan 41 rotates and collects the gas. On the other hand, the second fan 24 cools down the power supply 33.

[0048] Temperature control method two:

[0049] When heating the battery cells 100 of different sizes, the temperature in the temperature adjustment cavity 211 is regulated according to the size change of the battery cells 100 to heat the two battery cells 100 in sequence. Taking the case where the size of the second battery cell 100 is smaller than that of the first battery cell 100 as an example, both the first fan 23 and the second fan 24 blow air in the reverse direction of the second direction, and the fan 41 blows air towards the outside, so that a negative pressure is generated in the temperature adjustment cavity 211, and the temperature in the temperature adjustment cavity 211 is reduced.

[0050] As Figure 5 shown, the input end of the conveyor belt 1 in the first direction protrudes relative to the third microwave suppressor 51 for the previous process to transfer the battery cell 100 onto the conveyor belt 1. The output end of the conveyor belt 1 in the first direction protrudes relative to the second microwave suppressor 52. A positioning mechanism 6 for positioning and guiding the battery cell 100 is provided at the output end of the conveyor belt 1. The positioning mechanism 6 includes an adjustment assembly 61. The adjustment assembly 61 with multiple degrees of freedom is fixedly arranged on the fixed part 11 of the conveyor belt 1. In this embodiment, the adjustment assembly 61 has degrees of freedom in the second direction and the vertical direction. Specifically, the adjustment assembly 61 includes a first adjustment seat 611 and a first adjustment rod 612. The first adjustment seat 611 is fixedly arranged on the fixed part 11. The first adjustment rod 612 is slidably connected to the first adjustment seat 611 in the vertical direction. The first adjustment seat 611 is threadedly connected with a first adjustment knob 613. The traveling direction of the first adjustment knob 613 intersects with the traveling direction of the first adjustment rod 612. The first adjustment knob 613 adjusts the height of the first adjustment rod 612 and fixes it.

[0051] A second adjustment seat 614 is fixedly arranged at the top of the first adjustment rod 612. A second adjustment rod 616 is slidably connected to the second adjustment seat 614. The second adjustment rod 616 slides in the second direction. The second adjustment seat 614 is threadedly connected with a second adjustment knob 615. The moving direction of the second adjustment knob 615 intersects with the moving direction of the second adjustment rod 616. The second adjustment knob 615 adjusts the feeding length of the second adjustment rod 616 above the conveying part 12 and fixes it.

[0052] A guide bar 62 is fixedly installed at the output end of the second adjusting rod 616. The operator adjusts the first adjusting rod 612 and the second adjusting rod 616, so that the height and position of the guide bar 62 at the top of the conveying part 12 can be adjusted to adapt to the cores 100 of different shapes and control the movement track of the cores 100. In this embodiment, there are two sets of adjusting assemblies 61. The paired adjusting assemblies 61 are respectively arranged on the fixing parts 11 on both sides of the conveying part 12. A guide bar 62 is fixedly installed at the output end of each of the two adjusting assemblies 61 to position the cores 100 that have completed heating in the second direction. Preferably, the guide bar 62 is a strip-shaped structure along the first direction, and the parts of the two guide bars 62 close to the second microwave suppressor 52 are bent in opposite directions. The fixing part 11 is fixedly installed with a limiting block 63. The limiting block 63 is close to the top of the end of the conveying part 12. The limiting block 63 is between the two guide bars 62. The guide bar 62 cooperates with the limiting block 63 to position the cores 100 that have completed heating, which is convenient for accurate hot pressing in the next step.

[0053] The above embodiments are only used to illustrate the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

Claims

1. A battery cell heating device, characterized in that, include: A conveyor belt (1) comprising a fixing portion (11) and a conveying portion (12), wherein the conveying portion (12) conveys the battery cell (100) along a first direction; A first microwave suppressor (2) is fixedly mounted on the fixing portion (11), the first microwave suppressor (2) surrounds the conveying portion (12) to form a heating cavity (21), and the first microwave suppressor (2) is provided with an input hole (27) and an output hole (28) for unidirectional conveying of the power core (100) along a first direction; A heating element (31) is built into the first microwave suppressor (2), and a plurality of heating elements (31) are fixed to the fixing portion (11) along a first direction, and are used to perform microwave heating on the electric core (100) entering the first microwave suppressor (2) while the heating elements (31) themselves dissipate heat; a first fan (23), wherein a plurality of first fans (23) built into the first microwave suppressor (2) are fixedly arranged on the fixing portion (11) along a first direction, the first fans (23) are located on a side of the heating element (31) away from the conveying portion (12), the first fans (23) are configured as a bidirectional airflow channel along a second direction, and a plurality of first ventilation holes (25) are provided on a side wall of the first microwave suppressor (2) close to the first fans (23); The heating chamber (21) is divided into a heat treatment chamber (212) and a temperature adjustment chamber (211) which are interconnected along the second direction; the temperature adjustment chamber (211) is located above the conveying portion (12); the heat treatment chamber (212) is formed by extending the first microwave suppressor (2) along the second direction, and constitutes an independent heating space protruding outside the conveying portion (12); the heating element (31) and the first fan (23) are both arranged in the heat treatment chamber (212); A partition (34) is fixedly arranged in the first microwave suppressor (2), the partition (34) being higher than the top of the conveying portion (12), the partition (34) dividing the heat treatment chamber (212) into a second chamber (2122) and a first chamber (2121) from top to bottom, the partition (34) being provided with a plurality of second fans (24) and a plurality of power supplies (33), the second fans (24) and the power supplies (33) being both built into the second chamber (2122), the second fans (24) being configured as a bidirectional airflow channel along a second direction, the side wall of the first microwave suppressor (2) being provided with a second ventilation hole (26), the second fans (24) being located on a side of the power supply (33) close to the temperature adjustment chamber (211).

2. The electric core heating device according to claim 1, characterized in that: An air pipe (22) is provided at the top of the first microwave suppressor (2), the air pipe (22) being connected to a fan (41), and a sensor (36) for detecting the temperature in the heating cavity (21) is fixedly provided on the first microwave suppressor (2).

3. The electric core heating device according to claim 1, characterized in that: A third microwave suppressor (51) and a second microwave suppressor (52) are fixedly arranged on the conveyor belt (1). Both the third microwave suppressor (51) and the second microwave suppressor (52) surround the conveying part (12). The third microwave suppressor (51) is communicated with the input hole (27) of the first microwave suppressor (2), and the second microwave suppressor (52) is communicated with the output hole (28) of the first microwave suppressor (2). The third microwave suppressor (51), the first microwave suppressor (2) and the second microwave suppressor (52) form a channel through which the power supply core (100) passes. The cross-sectional area of the cavity of the third microwave suppressor (51) and the cross-sectional area of the cavity of the second microwave suppressor (52) are both smaller than the cross-sectional area of the cavity of the first microwave suppressor (2).

4. The cell heating device according to claim 1, wherein: The temperature adjustment cavity (211) includes an upper cavity (2111) and a lower cavity (2112) that are vertically communicated. The first cavity (2121) is horizontally communicated with the lower cavity (2112), the second cavity (2122) is horizontally communicated with the upper cavity (2111), and the conveying part (12) is located in the lower cavity (2112).

5. The cell heating device according to claim 1, wherein: A viewing window (71) is rotatably connected to the side wall of the first microwave suppressor (2). A metal mesh (72) is fixedly arranged on the viewing window (71), and the inner wall of the first microwave suppressor (2) is made of metal.

6. The cell heating device according to claim 1, characterized in that: An adjusting assembly (61) and a guiding strip (62) are arranged at the output end of the conveyor belt (1). The adjusting assembly (61) is adjustably arranged in the second direction and the vertical direction on the fixing part (11). The guiding strip (62) is fixedly arranged at the output end of the adjusting assembly (61), and the guiding strip (62) is located at the tail of the conveying part (12).

7. The cell heating device according to claim 6, characterized in that: The adjusting assemblies (61) are arranged in pairs on both sides of the conveying part (12), and the guiding strips (62) are arranged in pairs on the top of the conveying part (12). The two guiding strips (62) form a channel for positioning the cell (100) in the first direction.

Images