Annealing process and annealing equipment for battery film layer

Abstract

The invention relates to the field of batteries, in particular to an annealing process and annealing equipment for a battery film layer, and aims to solve the technical problem that temperature control is inaccurate or a battery light absorption layer is damaged when a large-size battery is annealed in the prior art. The annealing process of the battery film layer comprises the following steps: placing a battery piece, namely placing the battery piece to be annealed on an upper heat conducting plate of a mounting mechanism; the annealing and temperature control module respectively controls the contact type heat source modules to start; monitoring: an infrared thermal imaging temperature measurement module monitors the temperature of the whole area of the upper heat conduction plate and sends a temperature monitoring result to a temperature control module; and the temperature control module adjusts the heating power of the contact type heat source modules corresponding to different positions according to the temperature values of the different positions of the upper heat conduction plate. According to the process, the large-size battery is subjected to contact annealing, the problem that the material of the light absorption layer is decomposed due to excessive irradiation does not exist, the heating power of the contact heat source modules at different positions of the upper heat conduction plate is respectively controlled, and the temperature balance of the positions of the upper heat conduction plate is ensured.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to an annealing process and annealing equipment for a battery film layer. Background Art

[0002] At present, non-contact infrared or ultraviolet heating is generally used in the production of large-size batteries. Infrared annealing is fast and easy to operate, but because the infrared light first acts on the glass substrate and then anneals the battery light-absorbing layer through heat conduction, the temperature control of the glass substrate is not precise; ultraviolet annealing can accurately heat the light-absorbing layer, but the light-absorbing layer material is sensitive to ultraviolet light, and excessive ultraviolet radiation will cause the light-absorbing layer material to decompose. Summary of the invention

[0003] The purpose of the present invention is to provide an annealing process and annealing equipment for a battery film layer, so as to solve the technical problems in the related art of inaccurate temperature control or damage to the battery light-absorbing layer during annealing of large-size batteries.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: In a first aspect, the present invention provides an annealing process for a battery film layer, comprising: placing a battery cell to be annealed on an upper heat conducting plate of a mounting mechanism; Annealing, the temperature control module controls each contact heat source module to start up; Monitoring: the infrared thermal imaging temperature measurement module monitors the temperature of the entire area of ​​the upper heat conducting plate and sends the temperature monitoring result to the temperature control module; Temperature adjustment: the temperature control module adjusts the heating power of the contact heat source module corresponding to different positions according to the temperature values ​​of different positions of the upper heat conducting plate.

[0005] Furthermore, in the temperature adjustment step, the temperature control module sets a heating temperature X and a deviation temperature Y; When the temperature value of a certain position of the upper heat conducting plate is lower than XY, the temperature control module increases the heating power of the contact heat source module at the position and lasts for a preset time; When the temperature value of a certain position of the upper heat conducting plate is higher than X+Y, the temperature control module reduces the heating power of the contact heat source module at this position and keeps it for a preset time.

[0006] Furthermore, during the entire annealing process, except for the time periods of increasing and decreasing the heating power, the contact heat source module is maintained at a standby power.

[0007] Furthermore, the annealing process of the battery membrane layer also includes a transport step, in which a conveyor belt transports the installation mechanism from an upper material position to a lower material position.

[0008] In a second aspect, the present invention further provides an annealing device for a battery membrane layer, the annealing device is used to implement the above-mentioned annealing process for the battery membrane layer, comprising: An installation mechanism, the installation mechanism comprising an upper heat conducting plate, the upper heat conducting plate being divided into at least three heat conducting areas connected in sequence from the inside to the outside, each of the heat conducting areas being provided with a contact heat source module; A temperature control module, the temperature control module is electrically connected to the contact heat source module; The infrared thermal imaging temperature measurement module is arranged on the mounting mechanism, is located directly above the upper heat conducting plate, and is electrically connected to the temperature control module.

[0009] Further, the contact heat source module includes a sub-heating module; From inside to outside, the sub-heating modules corresponding to each heat transfer area become increasingly dense.

[0010] Furthermore, the mounting mechanism further comprises a lower heat conducting plate, and the lower heat conducting plate is directly opposite to the upper heat conducting plate; The contact heat source module is clamped between the lower heat conducting plate and the upper heat conducting plate.

[0011] Furthermore, the mounting mechanism also includes a mounting frame; The mounting frame includes a base and a top plate, four columns are fixed to the four corners of the base respectively, and the top plate is fixed to the top ends of the four columns; The infrared thermal imaging temperature measurement module is fixed to the top plate; The four columns are passed through the upper heat conducting plate and the lower heat conducting plate, and each column is threadedly connected with an adjusting nut, and the adjusting nut abuts against the upper surface of the upper heat conducting plate; A heat insulation layer is sandwiched between the lower heat conducting plate and the base.

[0012] Furthermore, a windshield is provided around the mounting frame, and the windshield, the base and the top plate are combined to form a heating chamber; The two opposite windshields are both hinged to the mounting frame and can open the heating chamber when rotating around the hinge axis.

[0013] Furthermore, the annealing equipment for the battery membrane layer also includes a conveyor belt, and the conveyor belt is used to convey the installation mechanism.

[0014] In summary of the above technical solutions, the technical effects that can be achieved by the annealing process of the battery film layer provided by the present invention are: In the annealing process of the battery film layer, the contact heat source module generates heat and transfers it to the upper heat conducting plate, so that the upper heat conducting plate realizes contact heating of the battery; the infrared thermal imaging temperature measurement module monitors the temperature of the entire area of ​​the upper heat conducting plate and sends the temperature monitoring result to the temperature control module; the temperature control module controls the corresponding contact heat source modules according to the temperature values ​​at different positions of the upper heat conducting plate. For positions below the set temperature, the temperature control module increases the heating power of the contact heat source module at this position. Conversely, for positions above the set temperature, the temperature control module reduces the heating power of the contact heat source module at this position.

[0015] It can be seen that compared with the existing technology, the annealing process of the battery film layer performs contact annealing on large-size batteries, and there is no problem of decomposition of the light-absorbing layer material due to excessive radiation; in addition, the heat sources at different positions of the heating table (i.e., the upper heat conduction plate + each contact heat source module) of the annealing process are independently set, and through the feedback of the infrared thermal imaging temperature measurement module and the regulation of the temperature control module, the temperature at each position of the heating table is guaranteed to be balanced, so that the battery cell can be evenly heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of the structure of an annealing device for a battery membrane layer provided in an embodiment of the present invention; Figure 2 A schematic diagram of the connection between the mounting mechanism provided in an embodiment of the present invention and the contact heat source module and the infrared thermal imaging temperature measurement module; Figure 3 A schematic diagram of an embodiment of a contact heat source module provided by an embodiment of the present invention; Figure 4 A schematic diagram of another embodiment of a contact heat source module provided by an embodiment of the present invention; Figure 5 A schematic diagram of the electrical control of the annealing equipment for the battery membrane layer provided in an embodiment of the present invention; Figure 6 A schematic diagram of the distribution of the heat conduction area of ​​the upper heat conduction plate provided in an embodiment of the present invention; Figure 7 Thermal imaging of the upper heat conducting plate provided by an embodiment of the present invention; Figure 8 This is the data table for the comparison group; Fig. 9 This is the data table when the experimental group uses heating wire and double heat conducting plates; Fig.10 This is the data table when the experimental group uses heating wire and single heat conducting plate; Fig.11 This is the data table when the experimental group uses heating rods and double heat conducting plates; Fig.12 This is the data table when the experimental group uses a heating rod and a single heat conductive plate.

[0018] Icon: 100-cell to be annealed; 200-installation mechanism; 210-upper heat conducting plate; 220-lower heat conducting plate; 230-installation frame; 240-adjusting nut; 250-insulation layer; 260-wind shield; 231-base; 232-top plate; 233-column; 300-temperature control module; 400-contact heat source module; 410-heating wire; 420-heating rod; 500-infrared thermal imaging temperature measurement module; 600-conveyor belt. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0022] At present, non-contact infrared or ultraviolet heating is generally used in the production of large-size batteries. Infrared annealing is fast and easy to operate, but because the infrared light first acts on the glass substrate and then anneals the battery light-absorbing layer through heat conduction, the temperature control of the glass substrate is not precise; ultraviolet annealing can accurately heat the light-absorbing layer, but the light-absorbing layer material is sensitive to ultraviolet light, and excessive ultraviolet radiation will cause the light-absorbing layer material to decompose.

[0023] In view of this, the present invention provides an annealing process for a battery film layer, including placing a battery cell 100 to be annealed on an upper heat conducting plate 210 of a mounting mechanism 200; annealing, a temperature control module 300 controls each contact heat source module 400 to start up; monitoring, an infrared thermal imaging temperature measurement module 500 monitors the temperature of the entire area of ​​the upper heat conducting plate 210, and sends the temperature monitoring result to the temperature control module 300; and temperature adjustment, the temperature control module 300 adjusts the heating power of the contact heat source module 400 corresponding to different positions according to the temperature values ​​at different positions of the upper heat conducting plate 210.

[0024] In the annealing process of the battery film layer, the contact heat source module 400 generates heat and transfers it to the upper heat conducting plate 210, so that the upper heat conducting plate 210 can achieve contact heating of the battery; the infrared thermal imaging temperature measurement module 500 monitors the temperature of the entire area of ​​the upper heat conducting plate 210, and sends the temperature monitoring result to the temperature control module 300; the temperature control module 300 controls the corresponding contact heat source module 400 according to the temperature values ​​at different positions of the upper heat conducting plate 210. For positions below the set temperature, the temperature control module 300 increases the heating power of the contact heat source module 400 at this position. Conversely, for positions above the set temperature, the temperature control module 300 reduces the heating power of the contact heat source module 400 at this position.

[0025] It can be seen that compared with the prior art, the annealing process of the battery film layer performs contact annealing on large-size batteries, and there is no problem of decomposition of the light-absorbing layer material due to excessive irradiation; in addition, the heat sources at different positions of the heating platform (i.e., the upper heat conduction plate 210 + each contact heat source module 400) of the annealing process are independently set, and through the feedback of the infrared thermal imaging temperature measurement module 500 and the regulation of the temperature control module 300, the temperature at each position of the heating platform is guaranteed to be balanced, so that the battery cell can be evenly heated.

[0026] The annealing process of the battery film layer provided in this embodiment is described in detail below: Furthermore, in the temperature adjustment step, the temperature control module 300 sets the heating temperature X and the deviation temperature Y; when the temperature value at a certain position of the upper heat conducting plate 210 is lower than XY, the temperature control module 300 increases the heating power of the contact heat source module 400 at that position and continues for a preset time; when the temperature value at a certain position of the upper heat conducting plate 210 is higher than X+Y, the temperature control module 300 reduces the heating power of the contact heat source module 400 at that position and continues for a preset time.

[0027] Specifically, during the entire annealing process, the contact heat source module 400 maintains a relatively low power, namely, the standby power, so as to ensure a relatively low temperature fluctuation rate. According to the distribution of each contact heat source module 400, the entire area of ​​the upper heat conducting plate 210 is divided into a plurality of heat conducting zones. Figure 6 ; When the infrared thermal imaging temperature measurement module 500 is monitoring, refer to Figure 7 , its lens unit performs thermal imaging of the entire area, and then its shooting signal processing circuit corrects the output image signal or compresses the data, and then its computer overall control and calculation unit reads the image data of each heat transfer area and calculates the average temperature of the corresponding heat transfer area; reference Figure 5 The infrared thermal imaging temperature measurement module 500 sends the average temperature of each heat transfer area to the temperature control module 300, and the temperature control module 300 automatically adjusts the heating power of the contact heat source module 400 at different positions according to the received information.

[0028] Continuing from the above, for the heating temperature X and the deviation temperature Y, for example, the heating temperature is set to 150°C and the deviation temperature is set to 1.5°C. The actual calculation results of each heat transfer zone are: Heat transfer zone 1 ( Figure 6 The average temperature of the left part is 148.2℃, and the average temperature of the heat transfer zone 2 ( Figure 6 The average temperature of the right part is 150.1℃, and the heat transfer zone 3 ( Figure 6 The average temperature of the square ring part is 150.6℃, and the heat transfer zone 4 ( Figure 6 The average temperature of the middle part is 151.7°C; after calculation, the temperature control module 300 sends a signal to the contact heat source module 400, so that the heating power of the contact heat source module 400 in one place of the heat transfer area is increased by 0.05W and maintained for 10s, and then the standby power is restored, and the heating power of the contact heat source modules 400 in four places of the heat transfer area is reduced by 0.05W and maintained for 2s, and then the standby power is restored.

[0029] Continuing with the above, the infrared thermal imaging temperature measurement module 500 monitors the temperature of the heat transfer area again. If the temperature is within the range of 150±1.5° C., the existing power is maintained. Otherwise, the heating power of the corresponding contact heat source module 400 is continuously adjusted.

[0030] Furthermore, the annealing process of the battery film layer also includes a transport step, in which the conveyor belt 600 transports the installation mechanism 200 from the upper material position to the lower material position to transport the battery cells. Here, the battery cells are annealed during transportation, and the annealing time can be adjusted by changing the speed of the conveyor belt 600.

[0031] By adopting this battery film annealing process, contact annealing of large-size perovskite batteries is achieved, and the annealing process of the perovskite film layer is better controlled and heated evenly, thereby achieving better crystallization. In addition, the interface between the perovskite film layer and the transport layer is improved, and the perovskite film layer is more uniform.

[0032] The present invention also provides a battery film annealing device, referring to Figures 1 to 4 , and combined with Figure 6 The annealing equipment is used to implement the annealing process of the battery film layer, including: The mounting mechanism 200 includes an upper heat conducting plate 210, which is divided into at least three heat conducting areas connected in sequence from the inside to the outside, and each heat conducting area is provided with a contact heat source module 400; the upper surface of the upper heat conducting plate 210 is smooth, which is convenient for contact with the battery cell, and thermal conductive silicone grease is provided between the lower surface and the contact heat source module 400; the temperature control module 300 is electrically connected to the contact heat source module 400; the infrared thermal imaging temperature measurement module 500 is arranged on the mounting mechanism 200, and is located directly above the upper heat conducting plate 210, and is electrically connected to the temperature control module 300; the conveyor belt 600 is used to convey the mounting mechanism 200.

[0033] Specifically, the contact heat source module 400 generates heat and transfers it to the upper heat conducting plate 210. The upper heat conducting plate 210 carries and heats PSC (Perovskite Solar Cells) to achieve contact heating of PSC. The infrared thermal imaging temperature measurement module 500 monitors the temperature of the entire area of ​​the upper heat conducting plate 210 and sends the temperature monitoring result to the temperature control module 300. The temperature control module 300 controls the corresponding contact heat source module 400 according to the temperature values ​​at different positions of the upper heat conducting plate 210. For positions below the set temperature, the temperature control module 300 increases the heating power of the contact heat source module 400 at that position. Conversely, for positions above the set temperature, the temperature control module 300 reduces the heating power of the contact heat source module 400 at that position. The conveyor belt 600 heats the cell at the set temperature for a certain period of time and then transfers it to the unloading position. In this way, the entire annealing process is completed.

[0034] In the above design, the upper heat conducting plate 210 and each contact heat source module 400 form a heating platform. Since each contact heat source module 400 is independent of each other and corresponds to a heat transfer zone one by one, the temperature of each position of the heating platform can be controlled separately. In this way, the problem of large temperature difference between the center and edge of the heating platform caused by large and small amounts of contact air is avoided, and the uniformity of heating is ensured. In addition, the infrared thermal imaging temperature measurement module 500 is used to monitor the temperature of the heating platform as a whole, avoiding the problem of inaccurate temperature monitoring caused by test errors when monitoring each heat transfer zone separately.

[0035] For further reference, Figure 3 and Figure 4 The contact heat source module 400 includes sub-heating modules; from the inside to the outside, the sub-heating modules corresponding to each heat transfer zone become increasingly dense.

[0036] Specifically, the sub-heating module can be a heating rod 420, a resistance wire, an electric heating wire or other devices or apparatuses having the function of generating heat. When the sub-heating module is a heating wire 410, the outer ring heating wire 410 is wound more tightly, such as Figure 3 When the sub-heating module is a heating rod 420, a larger number of heating rods 420 are arranged in the outer ring, such as Figure 4 This design can prevent the edge of the heating platform from losing temperature too quickly and ensure the overall temperature balance of the heating platform.

[0037] Regarding the mounting mechanism 200, specifically: refer to Figure 2 The mounting mechanism 200 further includes a lower heat conducting plate 220, which is opposite to the upper heat conducting plate 210. Both are made of materials with high thermal conductivity, such as copper, aluminum and other materials with good thermal conductivity. The contact heat source module 400 is clamped between the lower heat conducting plate 220 and the upper heat conducting plate 210. Such a design can improve temperature uniformity and reduce the efficiency non-uniformity of the battery.

[0038] Continuing from the above, the mounting mechanism 200 also includes a mounting frame 230; the mounting frame 230 includes a base 231 and a top plate 232, four columns 233 are fixed to the four corners of the base 231, and the top plate 232 is fixed to the top of the four columns 233; the infrared thermal imaging temperature measurement module 500 is fixed to the top plate 232; the four columns 233 are penetrated by the upper heat conducting plate 210 and the lower heat conducting plate 220, and each column 233 is threadedly connected with an adjusting nut 240, and the adjusting nut 240 is in contact with the upper surface of the upper heat conducting plate 210; an insulating layer 250 is sandwiched between the lower heat conducting plate 220 and the base 231.

[0039] In the above design, there is a large friction coefficient between the base 231 and the conveyor belt 600, which can ensure the stability of the conveying process without bumps and the like; the heat insulation layer 250 is made of materials such as asbestos and glass fiber, which are not limited here, and can isolate the heat transfer between the contact heat source module 400 and the base 231; during installation, from bottom to top, the heat insulation layer 250 (through holes are provided at the four corners to penetrate the pillars 233), the lower heat conduction plate 220 (through holes are provided at the four corners to penetrate the pillars 233), the contact heat source module 400, and the upper heat conduction plate 210 (through holes are provided at the four corners to penetrate the pillars 233) are placed on the base 231 in sequence, and then the adjusting nuts 240 are tightened to fasten the four to the base 231. Here, by loosening and tightening the adjusting nuts 240, the upper heat conduction plate 210 can be ensured to be placed horizontally.

[0040] Continuing with the above, the mounting frame 230 is provided with a windshield plate 260 ( Figure 2 Only one side is shown in the figure), the wind shield 260, the base 231 and the top plate 232 enclose a heating chamber; the two opposite wind shields 260 are hinged to the mounting frame 230, and can open the heating chamber under the condition of rotating around the hinge axis.

[0041] The above design can reduce the air flow in the battery cell area. When loading and unloading materials, the battery cells can be taken out and placed by turning over the wind shield 260.

[0042] To further illustrate the annealing effect of the battery film layer annealing equipment, an annealing equipment for battery film layer provided by the present invention is compared with a traditional heating table (traditional annealing equipment) through an experiment (the following S1-S6 are the production steps of perovskite batteries, which are mature processes. Here it is only used to illustrate the position of the annealing process in the battery production process).

[0043] S1, cleaning of conductive glass: After cutting the laser-etched 10 cm*10 cm FTO conductive glass into the required size, ultrasonically clean it with detergent solution, acetone and isopropanol for 30 min respectively, and then place it in a UV-ozone device for treatment for 30 min.

[0044] S2, preparation of titanium dioxide electron transport layer: take 1g of commercially available TiO2 slurry, dilute it with 10mL of anhydrous ethanol, stir it evenly with a magnetic bar to obtain a TiO2 diluted slurry. -1 Spin coat 35 μL of TiO2 diluted slurry for 15 s at an acceleration of 1000 rpm. -1 Immediately after spin coating, the substrate was annealed on a heating stage at 80°C for 30 min and then slowly heated to 500°C for 20 min to remove organic components.

[0045] S3, preparation of perovskite film: 159 mg MAI and 461 mg PbI2 were dissolved in 1 mL DMSO solvent to obtain 1 mL perovskite precursor solution. The substrate obtained in step S2 was treated on a UV-ozone device for 30 min. In a glove box filled with nitrogen, the pre-prepared perovskite precursor solution was heated at 4000 rpm. -1 The treated substrate was spin-coated for 30 seconds at a rotation speed of 0.50 rpm. After spin coating, the perovskite film was immediately annealed on a heating table at 100° C. for 10 minutes to obtain a perovskite film.

[0046] S4, preparation of hole transport layer: 91 mg spiro-OMeTAD was dissolved in 1 mL chlorobenzene, wherein the additive was 21 µL LiTFSI stock solution (520 mg dissolved in 1 mL acetonitrile), and the additive was added to the spiro-OMeTAD solution to prepare a hole transport layer solution. -1 The above solution was spin-coated onto the surface of the perovskite film at a rotation speed of , and the spin-coating time was 20 s.

[0047] S5, preparation of metal electrode: depositing a 80 nm thick gold electrode on the above-prepared substrate by thermal evaporation to complete the preparation of the perovskite cell.

[0048] S6, Efficiency test: The current-voltage (JV) characteristics were recorded by applying an external potential bias to the assembled cell device, and the generated photocurrent was recorded using a digital source meter (Keithley 2400). The light source used was a 450W xenon lamp equipped with a daylight filter to make the emission spectrum of the lamp conform to the AM1.5G standard.

[0049] The prepared solar cell was tested for efficiency non-uniformity at 25 different points. The non-uniformity calculation formula is: (PCEmax-PCEmin) / (PCEmax+PCEmin)*100%, where PCEmax is the maximum value of the photoelectric conversion efficiency among the 25 points, and PCEmin is the minimum value of the photoelectric conversion efficiency among the 25 points.

[0050] The data of the control group (traditional heating stage) are as follows Figure 8 As shown, Jsc is the current density of the short-circuit current, Voc is the open-circuit voltage, and FF is the fill factor. Through calculation, it can be obtained that the average photoelectric conversion efficiency is 18.54% and the efficiency non-uniformity is 5.21%.

[0051] The experimental group (annealing equipment for battery film layer) conducted experiments on the sub-heating module using heating wire 410, heating rod 420, and single and double heat conducting plates. Fig. 9The data of the sub-heating module using the heating wire 410 and the double heat conducting plates (upper heat conducting plate 210 and lower heat conducting plate 220) are calculated to obtain: the average photoelectric conversion efficiency is 19.53%, and the efficiency non-uniformity is 1.90%; Fig.10 The data of the sub-heating module using the heating wire 410 and a single heat conducting plate (only the upper heat conducting plate 210) is calculated to obtain: the average photoelectric conversion efficiency is 19.07%, and the efficiency non-uniformity is 2.94%; Fig.11 The data of the sub-heating module using the heating rod 420 and the double heat conducting plates (upper heat conducting plate 210 and lower heat conducting plate 220) are calculated to obtain: the average photoelectric conversion efficiency is 19.29%, and the efficiency non-uniformity is 2.79%; Fig.12 The data of the sub-heating module using the heating rod 420 and a single heat conducting plate (only the upper heat conducting plate 210) is calculated to obtain: the average photoelectric conversion efficiency is 19.09%, and the efficiency non-uniformity is 4.38%.

[0052] From the comparison between the control group and the experimental group, it can be seen that compared with the traditional heating table, the average efficiency of the battery film annealing equipment is improved and the efficiency non-uniformity is significantly reduced. In addition, from the comparison between the experimental groups, it can be seen that compared with the use of a single heat conducting plate, the double heat conducting plate can improve the temperature uniformity and reduce the efficiency non-uniformity of the battery.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An annealing process for a battery film layer, characterized in that: The following steps are involved: Placing the cell sheet (100) to be annealed on the upper heat conducting plate (210) of the mounting mechanism (200); Annealing, the temperature control module (300) controls each contact heat source module (400) to start; Monitoring, the infrared thermal imaging temperature measurement module (500) monitors the temperature of the entire area of ​​the upper heat conducting plate (210), and sends the temperature monitoring result to the temperature control module (300); Temperature adjustment, the temperature control module (300) adjusting the heating power of the contact heat source module (400) corresponding to different positions according to the temperature values ​​at different positions of the upper heat conducting plate (210); In the temperature adjustment step, the temperature control module (300) sets a heating temperature X and a deviation temperature Y; When the temperature value of a certain position of the upper heat conducting plate (210) is lower than XY, the temperature control module (300) increases the heating power of the contact heat source module (400) at the position and continues for a preset time; When the temperature value of a certain position of the upper heat conducting plate (210) is higher than X+Y, the temperature control module (300) reduces the heating power of the contact heat source module (400) at the position and keeps doing so for a preset time.

2. The annealing process of the battery film layer according to claim 1, characterized in that: During the entire annealing process, except for the time periods of increasing and decreasing the heating power, the contact heat source module (400) is maintained at the standby power.

3. The annealing process of the battery film layer according to any one of claims 1 to 2, characterized in that: The annealing process of the battery membrane layer also includes a transport step, wherein a conveyor belt (600) transports the installation mechanism (200) from an upper material position to a lower material position.

4. An annealing device for a battery film layer, characterized in that: The annealing process for implementing the battery film layer according to any one of claims 1 to 3 comprises: A mounting mechanism (200), the mounting mechanism (200) comprising an upper heat conducting plate (210), the upper heat conducting plate (210) being divided into at least three heat conducting areas connected in sequence from the inside to the outside, each of the heat conducting areas being provided with a contact heat source module (400); A temperature control module (300), the temperature control module (300) being electrically connected to the contact heat source module (400); An infrared thermal imaging temperature measurement module (500), wherein the infrared thermal imaging temperature measurement module (500) is arranged on the mounting mechanism (200), is located directly above the upper heat conducting plate (210), and is electrically connected to the temperature control module (300).

5. The annealing device for battery membrane layer according to claim 4, characterized in that: The contact heat source module (400) comprises a sub-heating module; From inside to outside, the sub-heating modules corresponding to each heat transfer area become increasingly dense.

6. The annealing device for battery membrane layer according to claim 4, characterized in that: The mounting mechanism (200) further comprises a lower heat conducting plate (220), wherein the lower heat conducting plate (220) faces the upper heat conducting plate (210); The contact heat source module (400) is clamped between the lower heat conducting plate (220) and the upper heat conducting plate (210).

7. The annealing device for battery membrane layer according to claim 6, characterized in that: The mounting mechanism (200) further comprises a mounting frame (230); The mounting frame (230) comprises a base (231) and a top plate (232); four columns (233) are respectively fixed at four corners of the base (231); and the top plate (232) is fixed to the top ends of the four columns (233); The infrared thermal imaging temperature measurement module (500) is fixed to the top plate (232); The four columns (233) are inserted through the upper heat conducting plate (210) and the lower heat conducting plate (220), and each column (233) is threadedly connected with an adjusting nut (240), and the adjusting nut (240) abuts against the upper surface of the upper heat conducting plate (210); A heat insulation layer (250) is sandwiched between the lower heat conducting plate (220) and the base (231).

8. The annealing device for battery membrane layer according to claim 7, characterized in that: A windshield (260) is provided around the mounting frame (230), and the windshield (260), the base (231) and the top plate (232) enclose a heating chamber; The two opposite windshields (260) are both hinged to the mounting frame (230) and are capable of opening the heating chamber when rotating around the hinge axis.

9. The annealing device for battery membrane layer according to claim 4, characterized in that: The battery film layer annealing device further comprises a conveyor belt (600), wherein the conveyor belt (600) is used to convey the installation mechanism (200).

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