Heating device, battery drying device and control method

Abstract

The invention provides a heating device, a battery drying device and a control method, and belongs to the technical field of batteries. The heating device comprises a silica gel heating film and a PTC heating assembly, the silica gel heating film is used for heating an object to be heated to a preset temperature, the PTC heating assembly covers the upper surface of the silica gel heating film, and the PTC heating assembly is used for heating the object to be heated which is heated to the preset temperature. Wherein the PTC heating assembly comprises an upper electrode plate, a PTC heating element and a lower electrode plate, and the upper electrode plate and the lower electrode plate are located on the upper surface and the lower surface of the PTC heating element respectively.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a heating device, a battery drying device and a control method. Background Art

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] During the production process of batteries, the batteries need to be dried. In some battery drying devices, the batteries are heated by a heating device to achieve battery drying. However, the temperature uniformity of the heating device is difficult to control during use, which can easily cause battery damage. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the background technology. To this end, one object of the present application is to provide a heating device, a battery drying device and a control method to reduce the heating time and improve the production capacity.

[0005] An embodiment of the first aspect of the present application provides a heating device, which includes a silicone heating film and a PTC heating component. The silicone heating film is used to heat the object to be heated to a preset temperature. The PTC heating component covers the upper surface of the silicone heating film. The PTC heating component is used to heat the object to be heated to the preset temperature. The PTC heating component includes an upper electrode sheet, a PTC heating element and a lower electrode sheet. The upper electrode sheet and the lower electrode sheet are respectively located on the upper and lower surfaces of the PTC heating element.

[0006] In the technical solution of the embodiment of the present application, a heating device is formed by combining a silicone heating film and a PTC heating component. The principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high temperature stage is adopted to divide the entire heating process into two stages. This not only can achieve rapid heating in the first heating stage, but also improves the temperature uniformity in the second heating stage, thereby increasing the average temperature of the heating device, reducing the heating time, and increasing production capacity.

[0007] In some embodiments, the projection size of the PTC heating component on the upper surface of the silicone heating film is not greater than the size of the upper surface of the silicone heating film. The projection size of the PTC heating component on the upper surface of the silicone heating film is not greater than the size of the upper surface of the silicone heating film, which can increase the contact area between the PTC heating component and the silicone heating film, and increase the probability of the PTC heating component and the silicone heating film achieving stable contact when the placement position of the PTC heating component deviates, thereby reducing the risk of poor contact between the PTC heating component and the silicone heating film.

[0008] In some embodiments, the upper electrode sheet and the lower electrode sheet are respectively overlapped with the upper and lower surfaces of the PTC heating element through silica gel. The gap between the PTC heating element and the upper electrode sheet and the lower electrode sheet is filled with thermally conductive silica gel, which solves the problem of heat transfer air isolation of the silica gel heating film upward, thereby realizing rapid preheating of the PTC heating component.

[0009] In some embodiments, the PTC heating component further includes an insulating layer, which is located on the upper surface of the upper electrode sheet. The provision of the insulating layer can reduce the risk of direct contact between the upper electrode sheet and the conductive member during use, thereby reducing the risk of short circuits and improving the stability of the performance of the heating device.

[0010] In some embodiments, the PTC heating element is a ceramic sheet. The ceramic sheet has a positive temperature coefficient characteristic. The PTC heating element is a ceramic sheet so that the PTC heating element will not continue to heat when overheated, reducing the risk of safety accidents such as fire and improving the safety of the PTC heating component.

[0011] In some embodiments, the number of PTC heating elements is multiple. Using multiple PTC heating elements can increase power, improve efficiency, enhance safety performance, adapt to different working conditions and voltage ranges, and extend the service life of the PTC heating component.

[0012] In some embodiments, multiple PTC heating elements are arranged at intervals. By arranging multiple PTC heating elements at intervals, the heat dissipation effect and heat uniformity can be significantly improved, thereby extending the service life and improving the working efficiency.

[0013] In some embodiments, the electrode sheet is made of copper, which makes the electrode sheet have excellent conductivity, good chemical stability, plasticity and price advantage.

[0014] In some embodiments, the silicone heating film includes a first heating area, a second heating area and a third heating area, wherein the second heating area surrounds the first heating area, and the third heating area surrounds the second heating area. The silicone heating film is divided into the first heating area, the second heating area and the third heating area, and the second heating area surrounds the first heating area, and the third heating area surrounds the second heating area, which improves the heat dissipation effect of the silicone heating film, enhances the structural strength, and optimizes the heat conduction, so that the silicone heating film can be used efficiently, stably and safely.

[0015] In some embodiments, the power density of the third heating zone is greater than the power density of the second heating zone, and the power density of the second heating zone is greater than the power density of the first heating zone. The power density of the third heating zone is greater than the power density of the second heating zone, and the power density of the second heating zone is greater than the power density of the first heating zone, which solves the problem of low temperature of the outer ring of the silicone heating film and improves the temperature uniformity of the silicone heating film.

[0016] In some embodiments, the heating device further includes a heating control component, which is electrically connected to the silicone heating film and the PTC heating component, and is used to control the silicone heating film and the PTC heating component to heat the heated object. The heating control component is used to realize electrical automation control of precise temperature adjustment of multiple heating stages of the heating device.

[0017] The embodiment of the second aspect of the present application provides a battery drying device, which includes a battery clamp and a heating device of any of the above embodiments, wherein the battery clamp is used to hold the battery, the battery clamp includes a heat-conducting bottom plate, and the heating device is installed on the heat-conducting bottom plate. The battery drying device includes the heating device provided by any of the above embodiments, which can be formed by combining a silicone heating film and a PTC heating component, and the whole heating process is divided into two stages by using the principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high temperature stage, which can not only achieve rapid heating in the first heating stage, but also improve the temperature uniformity of the second heating stage, thereby increasing the average temperature of the heating device, reducing the heating time, and increasing production capacity.

[0018] The embodiment of the third aspect of the present application provides a heating control method, which is applied to the heating device and battery drying device of any of the aforementioned embodiments, and the heating control method includes: controlling the silicone heating film to heat the object to be heated; in response to the temperature of the object to be heated being a preset temperature, controlling the PTC heating film to heat the object to be heated. The heating device is formed by combining the silicone heating film and the PTC heating component, and the principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high temperature stage is adopted to divide the entire heating process into two stages, which can not only achieve rapid heating in the first heating stage, but also improve the temperature uniformity in the second heating stage, thereby increasing the average temperature of the heating device, reducing the heating time, and increasing production capacity.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0021] Figure 1This is a schematic diagram of the structure of a heating device in some embodiments of the present application; Figure 2 A temperature and resistance curve diagram of a PTC heating component in some embodiments of the present application; Figure 3 A schematic diagram of the exploded structure of a PTC component of some embodiments of the present application; Figure 4 This is a schematic diagram of the distribution structure of PTC heating elements in some embodiments of the present application; Figure 5 This is a schematic diagram of the structure of the silicone heating film of some embodiments of the present application; Figure 6 This is a flow chart of a heating control method according to some embodiments of the present application.

[0022] Description of reference numerals: 1000. Heating device; 100, PTC heating component; 200, silicone heating film; 110, upper electrode sheet; 120, PTC heating element; 130, lower electrode sheet; 140, insulating layer; 210, first heating zone; 220, second heating zone; 230, third heating zone. DETAILED DESCRIPTION

[0023] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0028] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0029] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0030] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0031] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0032] In the manufacturing process of batteries, especially lithium batteries, moisture will have a great impact on the performance of the battery, such as affecting the capacity, internal resistance, self-discharge, power density, cycle life, charge and discharge rate and other indicators, and the moisture content of the battery will also have an adverse effect on the stability and consistency of the battery. Therefore, the battery needs to be dried. In the related art, the battery is dried by a battery drying device so that the moisture inside the battery is fully discharged.

[0033] In the related art, the battery drying device uses vacuum baking as the key process to remove the water content inside the battery. The temperature uniformity of the battery drying device for baking the battery is generally ±5°C, which limits the upper limit of the process temperature, prolongs the process time, and the water content detection adds additional equipment costs. How to effectively improve the temperature uniformity and increase the upper limit of the process temperature has become a problem that needs to be solved.

[0034] Based on this, an embodiment of the present application discloses a heating device, which includes a silicone heating film and a positive temperature coefficient (PTC) heating component, the PTC heating component covering the upper surface of the silicone heating film, the silicone heating film being used to heat the object to be heated to a preset temperature, and the PTC heating component being used to heat the object to be heated that is heated to the preset temperature, wherein the PTC heating component includes an upper electrode sheet, a PTC heating element and a lower electrode sheet, and the upper electrode sheet and the lower electrode sheet are respectively located on the upper and lower surfaces of the PTC heating element.

[0035] The heating device is formed by combining a silicone heating film and a PTC heating component. The principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high-temperature stage is adopted to divide the entire heating process into two stages. This not only achieves rapid heating in the first heating stage, but also improves the temperature uniformity in the second heating stage, thereby providing space for increasing the upper limit of the process temperature, reducing the heating time and increasing production capacity.

[0036] The heating device disclosed in the embodiment of the present application can be used in a battery drying device or other drying device using the heating device as a heat source. The battery drying device can be, but is not limited to, a battery tunnel drying device, a battery mobile drying device, a vacuum drying device, and the like.

[0037] The embodiment of the present application provides a heating device, Figure 1 This is a schematic diagram of the structure of the heating device in some embodiments of the present application. Figure 2 The temperature and resistance curves of the PTC heating components in some embodiments of the present application are as follows: Figure 3 This is a schematic diagram of the decomposed structure of the PTC component of some embodiments of the present application. Figure 4This is a schematic diagram of the distribution structure of PTC heating elements in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the silicone heating film in some embodiments of the present application. Figures 1 to 5 As shown, the heating device 1000 includes a silicone heating film 200 and a PTC heating component 100, the PTC heating component 100 covers the upper surface of the silicone heating film 200, the silicone heating film 200 is used to heat the object to be heated to a preset temperature, and the PTC heating component 100 is used to heat the object to be heated heated to the preset temperature, wherein the PTC heating component 100 includes an upper electrode sheet 110, a PTC heating element 120 and a lower electrode sheet 130, and the upper electrode sheet 110 and the lower electrode sheet 130 are respectively located on the upper and lower surfaces of the PTC heating element.

[0038] The silicone heating film 200 can be a flexible electric heating film element formed by laminating silicone rubber, high temperature resistant, high thermal conductivity, good insulation performance, and good strength, and glass fiber material that is resistant to high temperatures and metal heating sheets. The silicone heating film 200 can be electrically connected to an external power source through a power cord, and the silicone heating film 200 converts electrical energy into thermal energy to achieve a heating effect. The silicone heating element has a uniform and stable temperature when heated, and can reach the expected temperature range in a relatively short time.

[0039] The upper electrode sheet 110 and the lower electrode sheet 130 can serve as the positive and negative electrodes of the PTC heating component 100 respectively. The upper electrode sheet 110 and the lower electrode sheet 130 are responsible for introducing electrical energy into the PTC heating element 120 to generate heat. The upper electrode sheet 110 and the lower electrode sheet 130 are usually made of conductive materials to ensure smooth passage of current.

[0040] The PTC heating element 120 is usually made of a ceramic sheet having a positive temperature coefficient characteristic, and its resistance can increase when the temperature rises, thereby realizing an automatic constant temperature function.

[0041] In the embodiment of the present application, the PTC heating component 100 includes an upper electrode sheet 110, a PTC heating element 120 and a lower electrode sheet 130. The PTC heating component 100 is easy to process and assemble without damaging the structure, thereby improving the stability of the working performance of the PTC heating component 100.

[0042] The PTC heating component 100 may further include an insulating layer 140, which is located on the upper surface of the upper electrode sheet 110. The PTC heating component 100 generates heat based on the PTC heating element 120. The PTC heating component 100 can be electrically connected to an external power source through a power cord. By utilizing its positive temperature coefficient effect, when current passes through the PTC heating element 120, the PTC heating element 120 will heat up due to its own heating. When the temperature of the PTC heating element 120 reaches the temperature threshold, the resistance increases sharply, causing the current flowing through the heating circuit to decrease rapidly. The reduction in current will reduce the temperature, and the temperature reduction will in turn reduce the resistance of the PTC heating element 120. The resistance reduction will increase the current and increase the temperature, and this cycle repeats, thereby achieving the temperature control of the PTC heating component 100 within a certain range, with a simple structure and low cost.

[0043] For example, Figure 2 The temperature and resistance curves of the PTC heating component 100 of some embodiments of the present application are shown in FIG. Figure 2 As shown in the figure, within the range of 0-90℃, the resistivity of PTC decreases with increasing temperature, and the rate of change is extremely small. P=U² / R shows that the output voltage U remains unchanged, the resistance decreases, and the power increases, but the increase is very small, which is not conducive to rapid temperature rise; in the range of 90-150℃, the resistivity of PTC increases with the increase of temperature, and the rate of change is extremely large. The output voltage U remains unchanged, the temperature rises, the resistance increases, and the power decreases, which can suppress the control of high temperature. The extremely large rate of change determines the response time of power changes, thereby achieving fast and precise temperature control.

[0044] In the embodiment of the present application, the PTC heating component 100 is covered on the upper surface of the silicone heating film 200. When the heating device 1000 heats the item to be heated, the heating process can be divided into two stages, wherein the first stage can be a preheating stage, and the second stage can be a vacuum stage. In the preheating stage, the silicone heating film 200 is used for heating, and the item to be depyrogenic is heated to a preset temperature, and the PTC heating component 100 is also heated to a preset temperature. In the vacuum stage, the PTC heating component 100 is used to heat the item to be heated to a preset temperature.

[0045] For example, during the preheating stage, i.e., during RT-90°C, the temperature is quickly raised to 90°C by heating through the silicone heating film 200. During the vacuum stage, i.e., during 90°C-140°C, the temperature is heated by the PTC heating component 100, and the power in the high temperature area is low (e.g., Figure 2 As shown in the figure), the low temperature area has high power, and the temperature average is adjusted quickly, so that the temperature average in the vacuum stage is greatly improved.

[0046] In the embodiment of the present application, a heating device 1000 is formed by combining a silicone heating film 200 and a PTC heating component 100. The entire heating process is divided into two stages by adopting the principle of rapid preheating of the silicone heating film 200 and rapid adjustment of power output of the PTC heating component 100 in the high temperature stage. This not only achieves rapid heating in the first heating stage, but also improves the temperature uniformity in the second heating stage, thereby increasing the average temperature of the heating device 1000, reducing the heating time, and increasing production capacity.

[0047] According to some embodiments of the present application, the projection size of the PTC heating component 100 on the upper surface of the silicone heating film 200 is not larger than the size of the upper surface of the silicone heating film 200 .

[0048] The PTC heating component 100 is covered on the upper surface of the silicone heating film 200 to form a heating device 1000. When the silicone heating film 200 is used to heat the item to be cooled to a preset temperature, the PTC heating component 100 is also heated to a preset temperature. In order to ensure that the entire PTC heating component 100 can be heated to a preset temperature and the temperature of the PTC heating component 100 is uniform, it is necessary to ensure that the entire PTC heating component 100 is covered on the upper surface of the silicone heating film 200, that is, the projection size of the PTC heating component 100 on the upper surface of the silicone heating film 200 is not greater than the size of the upper surface of the silicone heating film 200.

[0049] In the embodiment of the present application, the projection size of the PTC heating component 100 on the upper surface of the silicone heating film 200 is not larger than the size of the upper surface of the silicone heating film 200, which can increase the contact area between the PTC heating component 100 and the silicone heating film 200, and improve the probability of the PTC heating component 100 and the silicone heating film 200 achieving stable contact when the placement position of the PTC heating component 100 deviates, thereby reducing the risk of poor contact between the PTC heating component 100 and the silicone heating film 200.

[0050] According to some embodiments of the present application, the upper electrode sheet 110 and the lower electrode sheet 130 are respectively overlapped with the upper and lower surfaces of the PTC heating element 120 through silica gel.

[0051] There may be gaps between the PTC heating element 120 and the upper electrode sheet 110 and the lower electrode sheet 130, which may cause the problem of hot air isolation during the heat transfer process, thereby causing uneven heat conduction between the PTC heating element 120 and the upper electrode sheet 110 and the lower electrode sheet 130. Therefore, in order to make the heat conduction between the PTC heating element 120 and the upper electrode sheet 110 and the lower electrode sheet 130 more uniform, the upper electrode sheet 110 and the lower electrode sheet 130 are attached to the upper and lower surfaces of the PTC heating element 120 through silica gel.

[0052] In the embodiment of the present application, the gap between the PTC heating element 120 and the upper electrode sheet 110 and the lower electrode sheet 130 is filled with thermally conductive silicone, which solves the problem of isolating the heat transfer air upward of the silicone heating film 200, thereby achieving rapid preheating of the PTC heating component 100.

[0053] According to some embodiments of the present application, the PTC heating component 100 further includes an insulating layer 140 , and the insulating layer 140 is located on the upper surface of the upper electrode sheet 110 .

[0054] When the heating device 1000 heats the article to be heated, the article to be heated needs to be placed on the heating device 1000, that is, the article to be heated needs to be placed on the upper surface of the PTC heating component 100. If the upper surface of the PTC heating component 100 is the upper electrode sheet 110, since the upper electrode sheet 110 needs to be connected to a power source for conductivity, there is a risk of conductivity when the article to be heated is in direct contact with the upper electrode sheet 110, that is, there may be safety issues. In order to make the heating device 1000 safer, the PTC heating component 100 also includes an insulating layer 140, which is located on the upper surface of the upper electrode sheet 110 and serves as an insulator.

[0055] The insulating layer 140 may be made of an insulating polymer, and the insulating polymer may be at least one of polyurethane, silicone rubber, high-density polyethylene and acrylonitrile-butadiene-styrene copolymer. The present application has no particular limitation on the source of the insulating polymer.

[0056] In the embodiment of the present application, the provision of the insulating layer 140 can reduce the risk of direct contact between the upper electrode sheet 110 and the conductive member during use, thereby reducing the risk of circuit short circuit and improving the stability of the performance of the heating device 1000.

[0057] According to some embodiments of the present application, the PTC heating element 120 is a ceramic sheet.

[0058] The ceramic sheet has a PTC characteristic, which makes the resistance value of the ceramic sheet increase sharply as the temperature rises after power is applied, thereby limiting the further increase of the current and achieving the effect of automatic temperature control. At the same time, the ceramic material can withstand higher temperatures and is suitable for use in high temperature environments; the ceramic sheet has a fast response speed, which makes the thermal response speed of the PTC heating element 120 fast and can quickly reach the set temperature.

[0059] In the embodiment of the present application, the ceramic sheet has a positive temperature coefficient characteristic, and the PTC heating element 120 is a ceramic sheet so that the PTC heating element 120 will not continue to heat when overheated, reducing the risk of safety accidents such as fire and improving the safety of the PTC heating component 100.

[0060] According to some embodiments of the present application, there are multiple PTC heating elements 120 .

[0061] By using multiple PTC heating elements 120, the overall power output can be increased to meet application scenarios with higher power requirements. In addition, multiple PTC heating elements 120 can disperse heat and improve heat exchange efficiency, thereby improving overall efficiency. The PTC heating element 120 has the characteristic of automatic constant temperature. When the temperature reaches the Curie temperature, the resistance value will increase sharply, thereby automatically reducing the power to prevent overheating. The use of multiple PTC heating elements 120 can further enhance this automatic constant temperature effect and ensure that the equipment can maintain safe operation under various working conditions. By using multiple PTC heating elements 120, it can be flexibly adjusted according to specific working conditions and application requirements. Multiple PTC heating elements 120 can disperse the workload and reduce the burden of a single element, thereby extending the overall service life. The PTC heating element 120 can operate in a wide voltage range, ranging from 12V to 380V. By using multiple PTC heating elements 120, it can better adapt to different voltage requirements and ensure that the equipment can work normally under different voltage conditions.

[0062] In the embodiment of the present application, the use of multiple PTC heating elements 120 can increase power, improve efficiency, enhance safety performance, adapt to different working conditions and voltage ranges, and extend the service life of the PTC heating component 100.

[0063] According to some embodiments of the present application, a plurality of PTC heating elements 120 are arranged at intervals.

[0064] When the PTC heating element 120 works at high temperature, its resistance will increase sharply as the temperature rises, thereby limiting the current and preventing overheating. This characteristic enables the PTC heating element 120 to self-regulate at high temperatures to avoid damage from overheating. However, in order to ensure that this self-regulation effect is more effective, multiple PTC heating elements 120 are usually spaced apart. The spacing setting can increase the air flow between the PTC heating elements 120, which helps to quickly dissipate heat and avoid local overheating. The spacing setting can ensure that the heat is evenly distributed between the various PTC heating elements 120, avoiding the situation where some areas are overheated while other areas are at lower temperatures. This can extend the service life of the PTC heating element 120 and keep it in an efficient working state.

[0065] In the embodiment of the present application, by arranging a plurality of PTC heating elements 120 at intervals, the heat dissipation effect and heat uniformity distribution can be significantly improved, thereby extending the service life and improving the working efficiency.

[0066] According to some embodiments of the present application, the electrode sheet is made of copper.

[0067] Copper has good electrical conductivity, and electrons flow easily along the direction of the copper conductor; copper has good chemical stability at room temperature and is not easily stripped and corroded by electrochemical reactions, thereby enhancing the service life of the electrode material; copper has very good plasticity and can be made into electrode sheets of different shapes through cold processing, hot processing, forging and deep drawing; compared with other common electrode materials, such as zinc, tin, gold, silver, etc., copper is relatively cheap and more suitable for large-scale production.

[0068] In the embodiment of the present application, the electrode sheet is made of copper, so that the electrode sheet has excellent conductivity, good chemical stability, plasticity and price advantages.

[0069] According to some embodiments of the present application, the silicone heating film 200 includes a first heating area 210 , a second heating area 220 and a third heating area 230 , wherein the second heating area 220 surrounds the first heating area 210 , and the third heating area 230 surrounds the second heating area 220 .

[0070] In the embodiment of the present application, the silicone heating film 200 includes a first heating area 210, a second heating area 220 and a third heating area 230, wherein the second heating area 220 surrounds the first heating area 210, and the third heating area 230 surrounds the second heating area 220. That is to say, the silicone heating film 200 adopts a "U"-shaped structural design, which can increase the heat dissipation area and help to better dissipate heat; it can reduce the influence of thermal expansion and contraction on the heating film, prevent deformation and damage, and increase the strength and stability of the structure while increasing the heat dissipation area; it can better control the heat conduction path, ensure the uniform distribution of heat in the heating film, avoid the appearance of hot spots and cold spots, and thus improve the heating effect.

[0071] In the embodiment of the present application, the silicone heating film 200 is divided into a first heating zone 210, a second heating zone 220 and a third heating zone 230, and the second heating zone 220 surrounds the first heating zone 210, and the third heating zone 230 surrounds the second heating zone 220, thereby improving the heat dissipation effect of the silicone heating film 200, enhancing the structural strength, and optimizing the heat conduction, so that the silicone heating film 200 can be used efficiently, stably and safely.

[0072] According to some embodiments of the present application, the power density of the third heating zone 230 is greater than the power density of the second heating zone 220 , and the power density of the second heating zone 220 is greater than the power density of the first heating zone 210 .

[0073] According to Fourier's law of thermal conductivity, the direction of heat transfer is opposite to the direction of temperature increase. The outer ring temperature of the silicone heating film 200 is lower than the center temperature, which is not conducive to the temperature uniformity of the silicone heating film 200. The silicone heating film 200 includes a first heating area 210, a second heating area 220 and a third heating area 230. The power density of each heating area can be designed separately. The power density of the third heating area 230 is greater than the power density of the second heating area 220, and the power density of the second heating area 220 is greater than the power density of the first heating area 210. The power density of the outer ring area is increased, which solves the problem of low outer ring temperature of the silicone heating film 200 and improves the temperature uniformity of the silicone heating film 200.

[0074] In the embodiment of the present application, the power density of the third heating zone 230 is greater than the power density of the second heating zone 220, and the power density of the second heating zone 220 is greater than the power density of the first heating zone 210, which solves the problem of low temperature of the outer ring of the silicone heating film 200 and improves the temperature consistency of the silicone heating film 200.

[0075] According to some embodiments of the present application, the heating device 1000 also includes a heating control component, which is electrically connected to the silicone heating film 200 and the PTC heating component 100, and the heating control component is used to control the silicone heating film 200 and the PTC heating component 100 to heat the object to be heated.

[0076] The heating control assembly may include multiple electrical components such as a main control switch, a leakage circuit breaker, an AC contactor, a solid-state relay, and a heating power line. In different heating stages, the multiple electrical components form different circuits to control the silicone heating film 200 and the PTC heating component 100, so that the silicone heating film 200 and the PTC heating component 100 heat the object to be heated.

[0077] In the embodiment of the present application, a heating control component is used to implement electrical automation control of precise temperature adjustment of multiple heating stages of the heating device 1000.

[0078] A second aspect of an embodiment of the present application provides a battery drying device, which includes a battery clamp and a heating device according to any one of the aforementioned embodiments. The battery clamp is used to hold the battery, the battery clamp includes a heat-conducting bottom plate, and the heating device is installed on the heat-conducting bottom plate.

[0079] In addition to the above devices, the battery drying device generally includes an electric control module electrically connected to the heating device, which is used to control the working state of the heating device (such as start, stop, power supply duration, etc.). In addition, the battery drying device may also include a vacuum pumping mechanism, a temperature sensing device, etc., which may be determined according to the specific type of the battery drying device.

[0080] The battery fixture can be made of multiple plates and has a cavity that can hold the battery. The thermal conductive bottom plate is generally a metal plate, such as an aluminum plate, or other plates with thermal conductivity. It is generally located at the bottom of the battery fixture and is used to hold the battery. The thermal conductive bottom plate can receive the heat conducted by the heating device and conduct the heat to the battery located on the thermal conductive bottom plate.

[0081] In an embodiment of the present application, the battery drying device includes the heating device provided by any of the above embodiments, and the heating device can be formed by combining a silicone heating film and a PTC heating component. The principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high temperature stage is adopted to divide the entire heating process into two stages. Not only can rapid heating in the first heating stage be achieved, but also the temperature uniformity in the second heating stage is improved, thereby increasing the average temperature of the heating device, reducing the heating time, and increasing production capacity.

[0082] The third aspect of the present application provides a heating control method, which is applied to the heating device and battery drying device of any one of the above embodiments. Figure 6 This is a flow chart of a heating control method according to some embodiments of the present application. Figure 6 As shown, the heating control method includes: step S610, controlling the silicone heating film to heat the object to be heated; step S620, in response to the temperature of the object to be heated being a preset temperature, controlling the PTC heating film to heat the object to be heated.

[0083] In the embodiment of the present application, the PTC heating component is covered on the upper surface of the silicone heating film. When the heating device heats the item to be heated, the heating process can be divided into two stages, wherein the first stage can be a preheating stage, and the second stage can be a vacuum stage. In the preheating stage, the silicone heating film is used for heating to heat the item to be depyrogenic to a preset temperature, and the PTC heating component is also heated to a preset temperature. In the vacuum stage, the PTC heating component is used to heat the item to be heated to the preset temperature.

[0084] For example, during the preheating stage, i.e., during RT-90°C, the temperature is quickly raised to 90°C by heating with a silicone heating film. During the vacuum stage, i.e., during 90°C-140°C, the temperature is quickly raised to 90°C by heating with a PTC heating component. The power is low in the high temperature area (e.g., Figure 2 As shown in the figure), the low temperature area has high power, and the temperature average is adjusted quickly, so that the temperature average in the vacuum stage is greatly improved.

[0085] In the embodiment of the present application, a heating device is formed by combining a silicone heating film and a PTC heating component. The principle of rapid preheating of the silicone heating film and rapid adjustment of power output of the PTC heating component in the high temperature stage is adopted to divide the entire heating process into two stages. This not only achieves rapid heating in the first heating stage, but also improves the temperature uniformity in the second heating stage, thereby increasing the average temperature of the heating device, reducing the heating time, and increasing production capacity.

[0086] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0087] According to one embodiment of the present application, Figures 1 to 5 As shown, a heating device is provided, the heating device 1000 includes a silicone heating film 200 and a PTC heating component 100, the PTC heating component 100 covers the upper surface of the silicone heating film 200, the projection size of the PTC heating component 100 on the upper surface of the silicone heating film 200 is not larger than the size of the upper surface of the silicone heating film 200, wherein the silicone heating film 200 is used to heat the object to be heated to a preset temperature, and the PTC heating component 100 is used to heat the object to be heated that is heated to the preset temperature.

[0088] The PTC heating component 100 includes an upper electrode sheet 110, a PTC heating element 120, a lower electrode sheet 130 and an insulating layer 140. The upper electrode sheet 110 and the lower electrode sheet 130 are respectively located on the upper and lower surfaces of the PTC heating element 120, and the insulating layer 140 is located on the upper surface of the upper electrode sheet 110. The upper electrode sheet 110 and the lower electrode sheet 130 are respectively overlapped with the upper and lower surfaces of the PTC heating element 120 through silica gel. The PTC heating element 120 is a ceramic sheet, and the number of the PTC heating elements 120 is multiple, and the multiple PTC heating elements 120 are arranged at intervals. The material of the electrode sheet is copper.

[0089] The silicone heating film 200 includes a first heating area 210, a second heating area 220 and a third heating area 230, wherein the second heating area 220 surrounds the first heating area 210, and the third heating area 230 surrounds the second heating area 220. The power density of the third heating area 230 is greater than the power density of the second heating area 220, and the power density of the second heating area 220 is greater than the power density of the first heating area 210.

[0090] The heating device 1000 also includes a heating control component, which is electrically connected to the silicone heating film 200 and the PTC heating component 100, and is used to control the silicone heating film 200 and the PTC heating component 100 to heat the object to be heated.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application 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 by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A heating device, characterized in that: The device comprises: Silicone heating film, used to heat the items to be heated to a preset temperature; and A PTC heating component, the PTC heating component is covered on the upper surface of the silicone heating film, and the PTC heating component is used to heat the object to be heated to a preset temperature; Wherein, the PTC heating component comprises an upper electrode sheet, a PTC heating element and a lower electrode sheet, and the upper electrode sheet and the lower electrode sheet are respectively located on the upper and lower surfaces of the PTC heating element.

2. The heating device according to claim 1, characterized in that The projection size of the PTC heating component on the upper surface of the silicone heating film is not larger than the size of the upper surface of the silicone heating film.

3. The heating device according to claim 1, characterized in that: The upper electrode sheet and the lower electrode sheet are respectively overlapped with the upper and lower surfaces of the PTC heating element through silica gel.

4. The heating device according to claim 1, characterized in that The PTC heating component further includes an insulating layer, and the insulating layer is located on the upper surface of the upper electrode sheet.

5. The heating device according to claim 1, characterized in that: The PTC heating element is a ceramic sheet.

6. The heating device according to claim 1, characterized in that: The number of the PTC heating elements is multiple.

7. The heating device according to claim 6, characterized in that: The plurality of PTC heating elements are arranged at intervals.

8. The heating device according to claim 1, characterized in that The electrode sheet is made of copper.

9. The heating device according to claim 1, characterized in that: The silicone heating film includes a first heating area, a second heating area and a third heating area, wherein the second heating area surrounds the first heating area, and the third heating area surrounds the second heating area.

10. The heating device according to claim 9, characterized in that The power density of the third heating zone is greater than the power density of the second heating zone, and the power density of the second heating zone is greater than the power density of the first heating zone.

11. The heating device according to claim 1, characterized in that: The heating device also includes a heating control component, which is electrically connected to the silicone heating film and the PTC heating component, and is used to control the silicone heating film and the PTC heating component to heat the object to be heated.

12. A battery drying device, characterized in that: The battery drying device comprises a battery clamp and a heating device according to any one of claims 1 to 11, wherein the battery clamp is used to hold the battery, the battery clamp comprises a heat-conducting bottom plate, and the heating device is mounted on the heat-conducting bottom plate.

13. A heating control method, characterized in that: Applicable to the heating device according to any one of claims 1 to 11 and the battery drying device according to claim 12, the heating control method comprises: Control the silicone heating film to heat the object to be heated; In response to the temperature of the object to be heated being a preset temperature, the PTC heating film is controlled to heat the object to be heated.

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