Heating Device, Battery Drying Device and Control Method

Abstract

The present application provides a heating device, a battery drying device and a control method, which belong to the field of battery technology. The heating device 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 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 the preset temperature. Among them, 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.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, 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 keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.

[0003] During the production process of batteries, it is necessary to dry the batteries. In some battery drying devices, the batteries are heated by a heating device to achieve drying of the batteries. However, it is difficult to control the temperature uniformity during the use of the heating device, which easily causes battery damage. Summary of the Invention

[0004] The present application aims to at least solve one of the technical problems existing in the background art. To this end, an 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 an article to be heated to a preset temperature, and the PTC heating component covers the upper surface of the silicone heating film. The PTC heating component is used to heat the article to be heated that has been heated to the preset temperature. Among them, 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.

[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. By using the principle of rapid preheating of the silicone heating film and rapid adjustment of power output in the high-temperature stage of the PTC heating component, the entire heating process is divided into two stages, which can not only achieve rapid temperature rise 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 improving the 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 not being greater than the size of the upper surface of the silicone heating film can increase the contact area between the PTC heating component and the silicone heating film, improve the probability of stable contact between the PTC heating component and the silicone heating film when the placement position of the PTC heating component is deviated, and thus reduce 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 laminated with the upper and lower surfaces of the PTC heating element through silica gel. The gaps between the PTC heating element and the upper and lower electrode sheets are filled with thermally conductive silica gel, which solves the problem of air isolation in the upward heat transfer of the silica gel heating film, thereby enabling the rapid preheating of the PTC heating assembly.

[0009] In some embodiments, the PTC heating assembly further includes an insulating layer located on the upper surface of the upper electrode sheet. The setting of the insulating layer can reduce the risk of direct contact between the upper electrode sheet and the conductive part during use, thereby reducing the risk of circuit short - circuit and improving the stability of the use 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 fact that the PTC heating element is a ceramic sheet enables the PTC heating element not to continue heating when overheated, reduces the risk of safety accidents such as fires, and improves the safety of the PTC heating assembly.

[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 assembly.

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

[0013] In some embodiments, the material of the electrode sheet is copper. The fact that the material of the electrode sheet is copper endows the electrode sheet with excellent electrical conductivity, good chemical stability, plasticity and price advantages.

[0014] In some embodiments, the silica gel heating film includes a first heating zone, a second heating zone and a third heating zone. Among them, the second heating zone surrounds the first heating zone, and the third heating zone surrounds the second heating zone. Dividing the silica gel heating film into the first heating zone, the second heating zone and the third heating zone, and the second heating zone surrounding the first heating zone and the third heating zone surrounding the second heating zone improves the heat dissipation effect of the silica gel heating film, enhances the structural strength, and optimizes the heat conduction, thereby enabling the silica gel heating film to be used efficiently, stably and safely.

[0015] In some embodiments, the power density of the third heating zone is greater than that of the second heating zone, and the power density of the second heating zone is greater than that of the first heating zone. The power density of the third heating zone being greater than that of the second heating zone and the power density of the second heating zone being greater than that of the first heating zone solves the problem of relatively low temperature at the outer ring of the silica gel heating film and improves the temperature uniformity of the silica gel heating film.

[0016] In some embodiments, the heating device further includes a heating control component, which is electrically connected to the silica gel heating film and the PTC heating component. The heating control component is used to control the silica gel heating film and the PTC heating component to heat the item to be heated. By adopting the heating control component, electrical automation control for precise temperature adjustment in multiple heating stages of the heating device is achieved.

[0017] An embodiment of the second aspect of the present application provides a battery drying device, which includes a battery fixture and the heating device according to any one of the foregoing embodiments. The battery fixture is used to hold the battery, and the battery fixture 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 in any one of the above embodiments. A heating device can be formed by combining a silica gel heating film and a PTC heating component. By using the principle that the silica gel heating film rapidly preheats and the PTC heating component rapidly adjusts the power output in the high-temperature stage, the entire heating process is divided into two stages. Not only can rapid temperature rise 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 improving the production capacity.

[0018] An embodiment of the third aspect of the present application provides a heating control method, which is applied to the heating device and the battery drying device according to any one of the foregoing embodiments. The heating control method includes: controlling the silica gel heating film to heat the item to be heated; in response to the temperature of the item to be heated reaching a preset temperature, controlling the PTC heating film to heat the item to be heated. By combining a silica gel heating film and a PTC heating component to form a heating device, and using the principle that the silica gel heating film rapidly preheats and the PTC heating component rapidly adjusts the power output in the high-temperature stage, the entire heating process is divided into two stages. Not only can rapid temperature rise 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 improving the production capacity.

[0019] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

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

[0021] Figure 1Schematic diagram of the structure of the heating device according to some embodiments of the present application;

[0022] Figure 2 Temperature and resistance curve diagram of the PTC heating component according to some embodiments of the present application;

[0023] Figure 3 Exploded schematic diagram of the PTC component according to some embodiments of the present application;

[0024] Figure 4 Schematic diagram of the distribution structure of the PTC heating element according to some embodiments of the present application;

[0025] Figure 5 Schematic diagram of the structure of the silicone heating film according to some embodiments of the present application;

[0026] Figure 6 Flow chart of the heating control method according to some embodiments of the present application.

[0027] Description of reference numerals:

[0028] 1000, heating device;

[0029] 100, PTC heating component; 200, silicone heating film;

[0030] 110, upper electrode plate; 120, PTC heating element; 130, lower electrode plate; 140, insulating layer;

[0031] 210, first heating area; 220, second heating area; 230, third heating area. Detailed implementation manners

[0032] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0034] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means more than two unless otherwise specifically defined.

[0035] Reference to "embodiments" in this specification means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0038] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0039] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication 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 specific circumstances.

[0040] At present, from the perspective of the development of the market situation, 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 plants, but also widely used in electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0041] In the manufacturing process of batteries, especially lithium batteries, moisture has a great impact on the performance of the batteries. For example, it affects indicators such as capacity, internal resistance, self-discharge, power density, cycle life, charge-discharge rate, etc. Moreover, the moisture content of the batteries will also have an adverse impact on the stability and consistency of the batteries. Therefore, it is necessary to dry the batteries. In related technologies, the batteries are dried by a battery drying device to fully discharge the moisture inside the batteries.

[0042] In related technologies, the battery drying device uses vacuum baking as the key process for removing the water content inside the batteries. The temperature uniformity of the battery drying device for baking the batteries is generally within ±5°C, which limits the upper limit of the process temperature, prolongs the process time, and the water content detection increases the additional equipment cost. How to effectively improve the temperature uniformity and increase the upper limit of the process temperature has become a problem to be solved.

[0043] Based on this, the embodiments of the present application disclose a heating device. The heating device includes a silica gel heating film and a positive temperature coefficient (PTC) heating component. The PTC heating component covers the upper surface of the silica gel heating film. The silica gel heating film is used to heat the item to be heated to a preset temperature, and the PTC heating component is used to heat the item to be heated that has been heated to the preset temperature. Among them, 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.

[0044] By combining the silica gel heating film and the PTC heating component to form a heating device, and adopting the principle of rapid preheating of the silica gel heating film and rapid adjustment of power output in the high-temperature stage of the PTC heating component, the entire heating process is divided into two stages. It can not only achieve rapid temperature rise in the first heating stage, but also improve the temperature uniformity in the second heating stage, thereby providing room for increasing the upper limit of the process temperature, reducing the heating time, and improving the production capacity.

[0045] The heating device disclosed in the embodiments of the present application can be used in a battery drying device or other drying devices that use this 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, etc.

[0046] An embodiment of the present application provides a heating device. Figure 1 It is a schematic structural diagram of the heating device according to some embodiments of the present application. Figure 2 It is a temperature-resistance curve graph of the PTC heating component according to some embodiments of the present application. Figure 3 It is a schematic exploded view of the PTC component according to some embodiments of the present application. Figure 4 It is a schematic distribution structure diagram of the PTC heating element according to some embodiments of the present application. Figure 5 It is a schematic structural diagram of the silicone heating film according to some embodiments of the present application. As Figures 1 to 5 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 item to be heated to a preset temperature, and the PTC heating component 100 is used to heat the item to be heated that has reached the preset temperature. Among them, the PTC heating component 100 includes an upper electrode sheet 110, a PTC heating element 120, and a lower electrode sheet 130. 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.

[0047] The silicone heating film 200 can be a flexible electric heating film element formed by pressing high-temperature resistant, high-thermal conductivity, good insulation performance, high-strength silicone rubber, high-temperature resistant glass fiber material, and a metal heating sheet. The silicone heating film 200 can be electrically connected to an external power source through a power cord. The silicone heating film 200 converts electrical energy into heat energy to achieve a heating effect. The silicone heating body has a uniform and stable temperature during heating and can reach the expected temperature range in a short time.

[0048] The upper electrode sheet 110 and the lower electrode sheet 130 can respectively serve as the positive and negative electrodes of the PTC heating component 100. 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 the smooth passage of current.

[0049] The PTC heating element 120 is usually made of a ceramic sheet. The ceramic sheet has a positive temperature coefficient characteristic and can increase the resistance when the temperature rises, thereby realizing an automatic constant temperature function.

[0050] 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, and does not damage the structure, which can improve the stability of the working performance of the PTC heating component 100.

[0051] The PTC heating component 100 may further include an insulating layer 140 located on the upper surface of the upper electrode plate 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 supply through a power cord. 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 heat generation. 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 rapidly decrease. The decrease in current will cause the temperature to drop, and the drop in temperature will in turn cause the resistance of the PTC heating element 120 to decrease. The decrease in resistance will cause the current to increase and the temperature to rise. This cycle repeats to control the temperature of the PTC heating component 100 within a certain range, with a simple structure and low cost.

[0052] Exemplarily, Figure 2 is the temperature and resistance value curve graph of the PTC heating component 100 in some embodiments of the present application. As Figure 2 shown, in the range of 0 - 90 °C, the resistivity of the PTC decreases with the increase in temperature, and the change rate is extremely small. From P = U² / R, it can be known that with the output voltage U remaining unchanged, when the resistance decreases, the power increases, but the increase amplitude is extremely small, which is not conducive to rapid heating. In the range of 90 - 150 °C, the resistivity of the PTC increases with the increase in temperature, and the change rate is extremely large. With the output voltage U remaining unchanged, as the temperature rises and the resistance increases, the power decreases, which can inhibit the control of high temperature. The extremely large change rate determines the response time of the power change, thus achieving fast and precise temperature control.

[0053] In the embodiments of the present application, the PTC heating component 100 covers the upper surface of the silicone heating film 200. During the process of the heating device 1000 heating the item to be heated, the heating process can be divided into two stages. The first stage can be the preheating stage, and the second stage can be the vacuum stage. In the preheating stage, the silicone heating film 200 is used for heating to heat the item to be heated to the preset temperature, and at the same time, the PTC heating component 100 is also heated to the preset temperature. In the vacuum stage, the PTC heating component 100 is used to heat the item to be heated that has been heated to the preset temperature.

[0054] Exemplarily, during the preheating stage, that is, during the period of RT - 90 °C, heating is carried out through the silicone heating film 200 to rapidly heat up to 90 °C. During the vacuum stage, that is, during the period of 90 °C - 140 °C, heating is carried out through the PTC heating component 100. The power in the area with a higher temperature is small (as Figure 2 shown), and the power in the area with a lower temperature is large, which can rapidly adjust the temperature uniformity and extremely improve the temperature uniformity during the vacuum stage.

[0055] In the embodiments of the present application, a heating device 1000 is formed by combining a silicone heating film 200 and a PTC heating component 100. According to the principle that the silicone heating film 200 preheats quickly and the PTC heating component 100 quickly adjusts the power output in the high-temperature stage, the entire heating process is divided into two stages. This not only enables rapid temperature rise 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 improving the production capacity.

[0056] 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 greater than the size of the upper surface of the silicone heating film 200.

[0057] The PTC heating component 100 covers the upper surface of the silicone heating film 200 to form the heating device 1000. When using the silicone heating film 200 to heat the item to be heated to a preset temperature, the PTC heating component 100 is also heated to the preset temperature. To ensure that the entire PTC heating component 100 can be heated to the preset temperature and the temperature uniformity of the PTC heating component 100, it is necessary to ensure that the entire PTC heating component 100 covers 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.

[0058] In the 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 greater 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, improve the probability of stable contact between the PTC heating component 100 and the silicone heating film 200 when the placement position of the PTC heating component 100 is deviated, and thus reduce the risk of poor contact between the PTC heating component 100 and the silicone heating film 200.

[0059] According to some embodiments of the present application, the upper electrode plate 110 and the lower electrode plate 130 are respectively laminated with the upper and lower surfaces of the PTC heating element 120 through silicone.

[0060] There may be gaps between the PTC heating element 120 and the upper electrode plate 110 and the lower electrode plate 130, which will form a problem of hot air isolation during the heat transfer process, and may thus lead to uneven heat conduction between the PTC heating element 120 and the upper and lower electrode plates 130. Therefore, to make the heat conduction between the PTC heating element 120 and the upper electrode plate 110 and the lower electrode plate 130 more uniform, the upper electrode plate 110 and the lower electrode plate 130 are attached to the upper and lower surfaces of the PTC heating element 120 through silicone.

[0061] In the embodiment of the present application, the gaps between the PTC heating element 120, the upper electrode plate 110 and the lower electrode plate 130 are filled with thermally conductive silica gel, which solves the problem of air isolation in the upward heat transfer of the silica gel heating film 200, thereby enabling rapid preheating of the PTC heating assembly 100.

[0062] According to some embodiments of the present application, the PTC heating assembly 100 further includes an insulating layer 140, and the insulating layer 140 is located on the upper surface of the upper electrode plate 110.

[0063] During the process of the heating device 1000 heating the item to be heated, the item to be heated needs to be placed on the heating device 1000, that is to say, the item to be heated needs to be placed on the upper surface of the PTC heating assembly 100. If the upper surface of the PTC heating assembly 100 is the upper electrode plate 110, since the upper electrode plate 110 needs to be connected to the power supply for conduction, there is a risk of conduction when the item to be heated is in direct contact with the upper electrode plate 110, that is to say, there may be safety problems. To make the heating device 1000 safer, the PTC heating assembly 100 further includes an insulating layer 140, and the insulating layer 140 is located on the upper surface of the upper electrode plate 110, and the insulating layer 140 plays an insulating role.

[0064] The insulating layer 140 can be made of an insulating polymer, and the insulating polymer can be at least one of polyurethane, silicone rubber, high-density polyethylene and acrylonitrile-butadiene-styrene copolymer. The present application has no special limitation on the source of the insulating polymer.

[0065] In the embodiment of the present application, the setting of the insulating layer 140 can reduce the risk of direct contact between the upper electrode plate 110 and the conductive part during use, and further reduce the risk of short circuit of the circuit, improving the stability of the use performance of the heating device 1000.

[0066] According to some embodiments of the present application, the PTC heating element 120 is a ceramic sheet.

[0067] The ceramic sheet has PTC characteristics. This characteristic enables the ceramic sheet to have a sharp increase in resistance value with the increase of temperature after being powered on, thereby limiting the further increase of current and achieving the effect of automatic temperature control. At the same time, the ceramic material can withstand a relatively high temperature and is suitable for use in a high-temperature environment; the ceramic sheet has a fast response speed, so that the PTC heating element 120 has a fast thermal response speed and can quickly reach the set temperature.

[0068] In the embodiment of the present application, the ceramic sheet has a positive temperature coefficient characteristic. The fact that the PTC heating element 120 is a ceramic sheet makes the PTC heating element 120 not continue to heat up when overheated, reducing the risk of safety accidents such as fires and improving the safety of the PTC heating assembly 100.

[0069] According to some embodiments of the present application, the number of PTC heating elements 120 is multiple.

[0070] By using multiple PTC heating elements 120, the overall power output can be increased to meet the application scenarios with higher power requirements. In addition, multiple PTC heating elements 120 can disperse heat, improve the heat exchange efficiency, and thus enhance the 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 and preventing overheating. Using multiple PTC heating elements 120 can further enhance this automatic constant temperature effect to ensure the safe operation of the device under various working conditions. By using multiple PTC heating elements 120, flexible adjustment can be made according to specific working conditions and application requirements. Multiple PTC heating elements 120 can disperse the working load, reduce the burden on a single element, and thus extend the overall service life. The PTC heating element 120 can work within a wide voltage range, ranging from 12V to 380V. By using multiple PTC heating elements 120, different voltage requirements can be better adapted to ensure the normal operation of the device under different voltage conditions.

[0071] In the embodiments of the present application, adopting 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.

[0072] According to some embodiments of the present application, multiple PTC heating elements 120 are arranged at intervals.

[0073] When the PTC heating element 120 works at high temperature, its resistance will increase sharply with the increase of temperature, thereby limiting the current and preventing overheating. This characteristic enables the PTC heating element 120 to self-regulate at high temperature and avoid overheating damage. However, in order to ensure that this self-regulating effect is more effective, multiple PTC heating elements 120 are usually arranged at intervals. The interval arrangement can increase the air flow between the PTC heating elements 120, contribute to the rapid dissipation of heat, and avoid local overheating. The interval arrangement can ensure the uniform distribution of heat among the PTC heating elements 120, avoiding the situation where some areas are overheated while other areas have a lower temperature. This can extend the service life of the PTC heating element 120 and maintain its efficient working state.

[0074] In the embodiments of the present application, by arranging multiple PTC heating elements 120 at intervals, the heat dissipation effect and the thermal uniform distribution can be significantly improved, thereby extending the service life and increasing the working efficiency.

[0075] According to some embodiments of the present application, the material of the electrode sheet is copper.

[0076] Copper has good electrical conductivity, and the electron flow is easy to flow 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, thus enhancing the service life of the electrode material; copper has very good plasticity and can be made into electrode sheets of different shapes by methods such as cold working, hot working, forging, and deep drawing; compared with other common electrode materials such as zinc, tin, gold, and silver, copper is relatively inexpensive and more suitable for large-scale production.

[0077] In the embodiment of the present application, the electrode sheet is made of copper, so that the electrode sheet has excellent electrical conductivity, good chemical stability, plasticity, and price advantages.

[0078] 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. Among them, the second heating area 220 surrounds the first heating area 210, and the third heating area 230 surrounds the second heating area 220.

[0079] 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. Among them, 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 "hui" - shaped structure design. This structure design can increase the heat dissipation area, contribute to better heat dissipation; can reduce the influence of thermal expansion and contraction on the heating film, prevent deformation and damage, and while increasing the heat dissipation area, also increases the strength and stability of the structure; 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.

[0080] In the embodiment of the present application, the silicone heating film 200 is divided into a first heating area 210, a second heating area 220, and a third heating area 230, and the second heating area 220 surrounds the first heating area 210, and the third heating area 230 surrounds the second heating area 220, which improves the heat dissipation effect of the silicone heating film 200, enhances the structural strength, and optimizes the heat conduction, so that the silicone heating film 200 can be used efficiently, stably, and safely.

[0081] According to some embodiments of the present application, 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.

[0082] According to Fourier's law of heat conduction, the direction of heat transfer is opposite to the direction of temperature increase. The temperature of the outer ring of the silica gel heating film 200 is lower than the central temperature, which is not conducive to the temperature uniformity of the silica gel heating film 200. The silica gel 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 that of the second heating area 220, and the power density of the second heating area 220 is greater than that of the first heating area 210. By increasing the power density of the outer ring area, the problem of the low temperature of the outer ring of the silica gel heating film 200 is solved, and the temperature uniformity of the silica gel heating film 200 is improved.

[0083] In the embodiment of the present application, the power density of the third heating area 230 is greater than that of the second heating area 220, and the power density of the second heating area 220 is greater than that of the first heating area 210, solving the problem of the low temperature of the outer ring of the silica gel heating film 200 and improving the temperature uniformity of the silica gel heating film 200.

[0084] According to some embodiments of the present application, the heating device 1000 further includes a heating control component, which is electrically connected to the silica gel heating film 200 and the PTC heating component 100. The heating control component is used to control the silica gel heating film 200 and the PTC heating component 100 to heat the item to be heated.

[0085] The heating control component may include multiple electrical components such as a main control switch, a leakage circuit breaker, a contactor, a solid state relay, and a heating power cord. In different heating stages, the multiple electrical components form different circuits, thereby controlling the silica gel heating film 200 and the PTC heating component 100 to heat the item to be heated.

[0086] In the embodiment of the present application, by using the heating control component, the electrical automation control of accurately adjusting the temperature in multiple heating stages of the heating device 1000 is realized.

[0087] In the second aspect of the embodiment of the present application, a battery drying device is provided. The battery drying device includes a battery fixture and the heating device according to any one of the foregoing embodiments. The battery fixture is used to hold the battery, and the battery fixture includes a heat-conducting bottom plate, and the heating device is installed on the heat-conducting bottom plate.

[0088] In addition to the above devices, the battery drying device generally further includes an electronic control module electrically connected to the heating device for controlling the working state of the heating device (such as starting, stopping, power supply duration, etc.). In addition, the battery drying device may further include a vacuum pumping mechanism, a temperature sensing device, etc., which can be specifically determined according to the specific type of the battery drying device.

[0089] The battery fixture can be formed by splicing multiple plate bodies and has a cavity capable of holding a battery. The heat-conducting bottom plate is generally a metal plate, such as an aluminum plate, or other plate bodies with heat-conducting functions can also be used. It is generally located at the bottom of the battery fixture and is used to carry the battery. The heat-conducting bottom plate can receive the heat conducted by the heating device and conduct the heat to the battery located on the heat-conducting bottom plate.

[0090] In the embodiments of the present application, the battery drying device includes the heating device provided in any of the above embodiments. The heating device can be formed by combining a silica gel heating film and a PTC heating component. Using the principle of rapid preheating of the silica gel heating film and rapid adjustment of power output in the high-temperature stage of the PTC heating component, the entire heating process is divided into two stages. Not only can the rapid temperature rise 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 improving the production capacity.

[0091] Embodiments of the third aspect of the present application provide a heating control method, which is applied to the heating device and the battery drying device in any of the foregoing embodiments. Figure 6 It is a flowchart of the heating control method for some embodiments of the present application. As Figure 6 shown, the heating control method includes: Step S610, controlling the silica gel heating film to heat the item to be heated; Step S620, in response to the temperature of the item to be heated being the preset temperature, controlling the PTC heating film to heat the item to be heated.

[0092] In the embodiments of the present application, the PTC heating component covers the upper surface of the silica gel heating film. During the process of the heating device heating the item to be heated, the heating process can be divided into two stages. The first stage can be the preheating stage, and the second stage can be the vacuum stage. In the preheating stage, the silica gel heating film is used for heating to heat the item to be heated to the preset temperature, and at the same time, the PTC heating component is also heated to the preset temperature. In the vacuum stage, the PTC heating component is used to heat the item to be heated that has been heated to the preset temperature.

[0093] Exemplarily, during the preheating stage, that is, during RT - 90°C, heating is carried out through the silica gel heating film to quickly rise to 90°C. During the vacuum stage, that is, during 90°C - 140°C, heating is carried out through the PTC heating component. The power of the area with a higher temperature is small (as Figure 2 shown), and the power of the area with a lower temperature is large, quickly adjusting the temperature uniformity to extremely improve the temperature uniformity in the vacuum stage.

[0094] In the embodiments of the present application, a heating device is formed by combining a silicone heating film and a PTC heating component. By using the principle that the silicone heating film preheats rapidly and the PTC heating component rapidly adjusts the power output in the high-temperature stage, the entire heating process is divided into two stages. This not only enables rapid temperature rise 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 improving the production capacity.

[0095] It should be understood that although the steps in the flowcharts involved in the above-described embodiments are shown in sequence according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear indication in this article, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-described embodiments may include multiple steps or multiple stages. 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 sequential but can be executed alternately or in turn with at least a part of other steps or steps or stages in other steps.

[0096] According to an embodiment of the present application, as Figures 1 to 5 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, and 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. Among them, the silicone heating film 200 is used to heat the item to be heated to a preset temperature, and the PTC heating component 100 is used to heat the item to be heated that has been heated to the preset temperature.

[0097] The PTC heating component 100 includes an upper electrode plate 110, a PTC heating element 120, a lower electrode plate 130, and an insulating layer 140. The upper electrode plate 110 and the lower electrode plate 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 plate 110. The upper electrode plate 110 and the lower electrode plate 130 are respectively laminated with the upper and lower surfaces of the PTC heating element 120 through silicone. The PTC heating element 120 is a ceramic sheet, and the number of PTC heating elements 120 is multiple, and the multiple PTC heating elements 120 are arranged at intervals. The material of the electrode plate is copper.

[0098] The silicone heating film 200 includes a first heating area 210, a second heating area 220, and a third heating area 230. Among them, 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 that of the second heating area 220, and the power density of the second heating area 220 is greater than that of the first heating area 210.

[0099] The heating device 1000 further includes a heating control component. The heating control component is electrically connected to the silicone heating film 200 and the PTC heating component 100. The heating control component is used to control the silicone heating film 200 and the PTC heating component 100 to heat the item to be heated.

[0100] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and 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 various embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, 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 or the battery drying device according to claim 12, the heating control method comprising: 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 component is controlled to heat the object to be heated.

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