Lithium battery electromagnetic induction heating device and temperature control circuit thereof

Abstract

The utility model relates to a lithium battery electromagnetic induction heating device and a temperature control circuit thereof. The device comprises an oven, a plurality of guide rails symmetrically and fixedly arranged on the inner wall of the oven in parallel, a battery heating tray assembly borne by the guide rails, vacuum equipment and a temperature control circuit, the heating tray assembly is composed of a battery heating tray, a square shell lithium battery placed on the battery heating tray, four interlayers which are arranged in the battery heating tray and are used for mounting excitation coils, and a heating plate; a magnet exciting coil in the battery heating tray is connected with an alternating current power supply to generate variable current, then a variable magnetic field is generated, a battery on the upper portion of the battery heating tray generates eddy current under the action of the magnetic field, and the lithium battery is heated through the Joule effect generated by the eddy current.

Description

Technical Field

[0001] The utility model belongs to the technical field of electromagnetic induction heating, and particularly relates to a lithium battery electromagnetic induction heating device and a temperature control circuit thereof. Background Art

[0002] In the current lithium battery manufacturing process, the control requirements for the water content inside the lithium battery are very strict. This is because if the water content is too high during the lithium battery filling process, it will affect the battery's discharge performance, overall life and even the safety of the battery itself. This requires that in the lithium battery baking process before the filling, the water control requirements are quite high. In the current market, the traditional lithium battery baking method is to transfer heat through the bottom heating plate directly in contact with the battery to achieve the process of heating the battery. However, there are a series of problems in this process, including low heat transfer efficiency, high energy consumption, unstable temperature uniformity, etc. The lithium battery baking method currently used in the market is to complete the battery baking through integral heating, which takes longer time than local baking using electromagnetic induction heating and requires more energy consumption. Utility Model Content

[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a lithium battery electromagnetic induction heating device that bakes moisture from the inside of a battery through an electromagnetic heating tray, which has a higher heat transfer efficiency; a battery heating tray can carry more batteries and has an improved energy consumption ratio; another purpose of the utility model is to provide a temperature control circuit for a battery heating tray that is connected to a temperature controller through an infrared temperature measuring probe and controls the temperature of an oven heating tray through PID, thereby ensuring temperature uniformity during the heating process.

[0004] The technical solution of the utility model is the lithium battery electromagnetic induction heating device, which is special in that it consists of an oven, a plurality of guide rails symmetrically and parallelly fixed on the inner wall of the oven, a battery heating tray assembly carried by the guide rails, a vacuum device and a temperature control circuit; the heating tray assembly consists of a battery heating tray, a square-shell lithium battery placed on the battery heating tray, four compartments inside the battery heating tray for installing an excitation coil, and a heating plate; the excitation coil inside the battery heating tray is connected to an AC power supply to generate a changing current, thereby generating a changing magnetic field, and the battery on the upper part of the battery heating tray generates eddy currents under the action of the magnetic field, and the lithium battery is heated by the Joule effect generated by the eddy currents.

[0005] As a preference: it also includes an infrared temperature monitoring sensor and a vacuum sensor; the infrared temperature monitoring sensor is arranged in the middle of the battery heating tray bracket, the vacuum sensor is arranged on the outer wall, the vacuum sensor is connected to the vacuum flange straight-through joint reserved on the side wall of the oven, and is connected to the inside of the oven to display the internal vacuum degree in real time.

[0006] Preferably, the battery heating tray is provided with four slots for installing excitation coils, which separate the four excitation coils to prevent overheating. After the excitation coils are installed, the lithium battery is placed horizontally on the battery heating tray; the battery heating tray is located at the tail end of a pair of heating plate side brackets and is connected to the power flange through an insulating sleeve.

[0007] Preferably, the power flange is composed of a flange body, a pair of through holes formed in the flange body, insulating sleeves respectively mounted on the top and bottom surfaces of the flange body from both ends of the pair of through holes, a power flange adapter fixed on the top surface of the flange body, and a power copper needle mounted in the insulating sleeve of the power flange adapter.

[0008] As a preferred embodiment: the temperature control circuit includes an infrared temperature monitoring sensor, a temperature controller, a temperature control switch, a power controller and a heating plate, and the thermal resistance temperature probe circuit is led out from the heating plate and connected in series with the temperature controller and the power controller in sequence, so as to monitor the temperature of the battery in real time through the infrared temperature monitoring sensor; the temperature control circuit uses the infrared temperature monitoring sensor to monitor the surface temperature of the battery, and the temperature of the heating plate and the temperature of the battery surface are detected in real time through the infrared temperature sensor installed on the heating plate, and the temperature signal is transmitted to the temperature control switch, and the temperature control switch performs PID adjustment internally according to two pre-set process parameters, and the two process parameters are the predetermined temperature of the heating plate and the predetermined temperature of the battery surface. After the battery surface temperature detected by the infrared temperature monitoring sensor reaches the set value, the temperature signal is transmitted to the power controller, and a stable voltage is output to the excitation coil in the heating plate, and the voltage will change the inductance strength of the excitation heating plate, and then change the magnetic field strength; similarly, if the temperature exceeds the set value, the voltage is reduced, the magnetic field is weakened, and the temperature is lower than the set value, the voltage is increased to ensure that the current temperature always meets the set temperature.

[0009] Another technical solution of the utility model is the temperature control circuit of the battery heating tray, which is special in that it includes an infrared temperature monitoring sensor, a temperature controller, a temperature control switch, a power controller and a heating plate, and a thermal resistance temperature probe line is led out from the heating plate and connected in series with the temperature controller and the power controller in sequence, so as to monitor the temperature of the battery in real time through the infrared temperature monitoring sensor; the temperature control circuit uses the infrared temperature monitoring sensor to monitor the surface temperature of the battery, and the temperature of the heating plate and the temperature of the battery surface are detected in real time through the infrared temperature sensor installed on the heating plate, and the temperature signal is transmitted to the temperature control switch, and the temperature control switch performs PID adjustment internally according to two pre-set process parameters, which are the predetermined temperature of the heating plate and the predetermined temperature of the battery surface. After the battery surface temperature detected by the infrared temperature monitoring sensor reaches the set value, the temperature signal is transmitted to the power controller, and a stable voltage is output to the excitation coil in the heating plate, and the voltage will change the inductance strength of the excitation heating plate, and then change the magnetic field strength; similarly, if the temperature exceeds the set value, the voltage is reduced, the magnetic field is weakened, and the temperature is lower than the set value, the voltage is increased to ensure that the current temperature always meets the set temperature.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] ⑴ Improved temperature uniformity: Vacuum baking and electromagnetic induction technology are used to precisely control the heat transfer method so that the metal material inside the lithium battery is evenly heated during the entire heating process. This uniform heating method can ensure temperature uniformity and ensure that all parts inside the battery reach the same temperature, thereby improving the crystallinity of the electrode material, optimizing the performance parameters of the battery, and enhancing its cycle life and safety.

[0012] ⑵ Reduced energy consumption: The lithium battery electromagnetic induction heating device combines vacuum baking and electromagnetic induction technology to achieve efficient energy utilization. The vacuum environment reduces convection and convective heat transfer in heat transfer, reducing energy loss. At the same time, the electromagnetic induction heating tray can directly transmit energy to the inside of the lithium battery material, avoiding energy waste in traditional heating methods. Therefore, this combination of technologies can not only reduce overall energy consumption, but also help improve the energy utilization efficiency of the production line and reduce production costs.

[0013] ⑶ Improved production efficiency: The rapid heating characteristics of electromagnetic induction heating technology can significantly shorten the baking cycle, thereby increasing the production rate of the production line. By accurately controlling the temperature during the heating process, efficient and continuous production can be achieved, reducing the idle time of the production line and improving equipment utilization. This not only improves production efficiency, but also increases the flexibility and adaptability of the production line, making it more competitive and productive.

[0014] (4) The vacuum equipment described in the utility model makes the interior of the box in a vacuum state, thereby reducing the boiling point of water and improving the efficiency of removing moisture from the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the structural front view of the utility model of the lithium battery electromagnetic induction heating vacuum baking equipment;

[0016] Figure 2 This is a structural axonometric diagram of the utility model of a lithium battery electromagnetic induction heating vacuum baking device;

[0017] Figure 3 This is a structural view of a battery heating tray for electromagnetic induction heating of lithium batteries of the utility model;

[0018] Figure 4 This is a front view of a battery heating tray for electromagnetic induction heating of lithium batteries of the utility model;

[0019] Figure 5 This is a right view of the battery heating tray for electromagnetic induction heating of lithium batteries of the utility model;

[0020] Figure 6 This is a structural view of the power flange of the utility model for electromagnetic induction heating of lithium batteries;

[0021] Figure 7 This is an exploded view of the power flange of the utility model for electromagnetic induction heating of lithium batteries;

[0022] Figure 8 This is the right view of the power flange of the utility model of lithium battery electromagnetic induction heating;

[0023] Fig. 9 This is a cross-sectional view of the power flange of the utility model for electromagnetic induction heating of lithium batteries;

[0024] Fig.10 This is a temperature control circuit diagram of a battery heating tray for electromagnetic induction heating of a lithium battery of the utility model;

[0025] Fig.11 The utility model discloses a temperature control circuit of a battery heating tray.

[0026] Main component symbols:

[0027] Power flange adapter 1 First insulating sleeve 2 Power copper pin 3 Power flange 4 Insulation sleeve 5 Vacuum baking equipment10 Infrared temperature monitoring sensor 20 Heating plate side bracket 30 Excitation coil 40 Heating plate 50 Vacuum sensor 60 Heating fixture support plate 70 Second insulating sleeve 80 Power flange assembly 90 DETAILED DESCRIPTION

[0028] The utility model will be further described below in conjunction with the accompanying drawings:

[0029] See also Figure 1As shown, the lithium battery electromagnetic induction heating device consists of an oven, a plurality of guide rails symmetrically and parallelly fixed on the inner wall of the oven, a battery heating tray assembly carried by the guide rails, and a vacuum baking device 10; the heating tray assembly consists of a battery heating tray, a square-shell lithium battery placed on the battery heating tray, four compartments inside the battery heating tray for installing an excitation coil 40, and a heating plate 50; the excitation coil 40 inside the battery heating tray is connected to an AC power supply to generate a changing current, thereby generating a changing magnetic field, and the battery on the upper part of the battery heating tray generates eddy currents under the action of the magnetic field, and the eddy currents generate a Joule effect to heat the lithium battery.

[0030] Adjustment of the vacuum baking equipment 10: The real-time vacuum degree inside the oven is detected by a vacuum gauge. A vacuum value is preset before heating, and an external vacuum extraction device is connected to ensure that the vacuum degree inside the box meets the set value. If the vacuum degree is too high, gas is extracted, and if it is too low, gas is inhaled. The vacuum device makes the inside of the box in a vacuum state, thereby reducing the boiling point of water and improving the efficiency of removing moisture from the lithium battery.

[0031] It also includes an infrared temperature monitoring sensor 20 and a vacuum sensor 60; the infrared temperature monitoring sensor 20 is arranged in the middle of the battery heating tray bracket, and the vacuum sensor 60 is directly connected to the vacuum flange straight-through joint reserved on the side wall of the oven, so that it can be directly connected to the inside of the oven to display the internal vacuum degree in real time. The infrared temperature monitoring sensor 20 can be installed on the outer wall and pass through the oven wall.

[0032] The battery heating tray is provided with four slots for installing the excitation coils 40, which separate the four excitation coils 40 to prevent overheating. After the excitation coils 40 are installed, the lithium battery is placed horizontally on the battery heating tray; the battery heating tray is located at the tail end of a pair of heating plate 50 side brackets 30 and is connected to the power flange assembly 90 through a second insulating sleeve 80.

[0033] See also Figures 6 to 9 As shown, the power flange is composed of a flange body 4, a pair of through holes opened in the flange body 4, a first insulating sleeve 2 respectively mounted on the top and bottom surfaces of the flange body 4 from both ends of the pair of through holes, a power flange adapter 1 fixed on the top surface of the flange body 4, and a power copper needle 3 mounted in the first insulating sleeve 2 of the power flange adapter 1.

[0034] See also Fig.10As shown, it also includes a battery heating tray temperature control circuit, including an infrared temperature monitoring sensor 20, a temperature controller, a temperature control switch, a power controller and a heating plate 50. The thermal resistor temperature probe circuit is led out from the heating plate 50 and connected in series with the temperature controller and the power controller in sequence, and then the temperature of the battery is monitored in real time by the infrared temperature monitoring sensor 20; the surface temperature of the battery is monitored by the infrared temperature monitoring sensor 20; the temperature of the heating plate 50 and the surface temperature of the battery are detected in real time by the infrared temperature monitoring sensor 20 installed on the heating plate 50, and the temperature signal is transmitted to the temperature control switch, and the temperature control switch performs PID adjustment internally according to two pre-set process parameters, and the two process parameters are the predetermined temperature of the heating plate 50 and the predetermined temperature of the battery surface. After the battery surface temperature detected by the infrared temperature monitoring sensor 20 reaches the set value, the temperature signal is transmitted to the power controller, and a stable voltage is output to the excitation coil 40 in the heating plate 50. The voltage will change the inductance strength of the excitation heating plate 50, and then change the magnetic field strength. Similarly, if the temperature exceeds the set value, the voltage is reduced, the magnetic field is weakened, and the temperature is lower than the set value, the voltage is increased, and the current temperature is always guaranteed to meet the set temperature.

[0035] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.

Claims

1. A lithium battery electromagnetic induction heating device, characterized in that: The invention is composed of an oven, several guide rails symmetrically and parallelly fixed on the inner wall of the oven, a battery heating tray assembly carried by the guide rails, a vacuum device and a temperature control circuit; the heating tray assembly is composed of a battery heating tray, a square-shell lithium battery placed on the battery heating tray, four compartments inside the battery heating tray for installing an excitation coil, and a heating plate; the excitation coil inside the battery heating tray is connected to an AC power supply to generate a changing current, thereby generating a changing magnetic field, and the battery on the upper part of the battery heating tray generates eddy currents under the action of the magnetic field, and the lithium battery is heated by the Joule effect generated by the eddy currents.

2. The lithium battery electromagnetic induction heating device according to claim 1, characterized in that: It also includes an infrared temperature monitoring sensor and a vacuum sensor; the infrared temperature monitoring sensor is arranged in the middle of the battery heating tray bracket, and the vacuum sensor is arranged on the outer wall. The vacuum sensor is connected to the vacuum flange straight-through joint reserved on the side wall of the oven, and is connected to the inside of the oven to display the internal vacuum degree in real time.

3. The lithium battery electromagnetic induction heating device according to claim 1, characterized in that: The battery heating tray is provided with four slots for installing excitation coils, which separate the four excitation coils to prevent overheating. After the excitation coils are installed, the lithium battery is placed horizontally on the battery heating tray; the battery heating tray is located at the tail end of a pair of heating plate side brackets and is connected to the power flange through an insulating sleeve.

4. The lithium battery electromagnetic induction heating device according to claim 3, characterized in that: The power flange consists of a flange body, a pair of through holes formed in the flange body, insulating sleeves respectively sleeved on the top and bottom surfaces of the flange body from both ends of the pair of through holes, a power flange adapter fixed on the top surface of the flange body, and a power copper needle sleeved in the insulating sleeve of the power flange adapter.

5. The lithium battery electromagnetic induction heating device according to claim 1, characterized in that: The temperature control circuit comprises an infrared temperature monitoring sensor, a temperature controller, a temperature control switch, a power controller and a heating plate. The thermal resistance temperature probe circuit is led out from the heating plate and connected in series with the temperature controller and the power controller in sequence, and then the temperature of the battery is monitored in real time by the infrared temperature monitoring sensor. The temperature control circuit uses the infrared temperature monitoring sensor to monitor the surface temperature of the battery. The temperature of the heating plate and the temperature of the battery surface are detected in real time by the infrared temperature sensor installed on the heating plate. The temperature signal is transmitted to the temperature control switch. The temperature control switch performs PID adjustment internally according to two pre-set process parameters. The two process parameters are the predetermined temperature of the heating plate and the predetermined temperature of the battery surface. After the battery surface temperature detected by the infrared temperature monitoring sensor reaches the set value, the temperature signal is transmitted to the power controller, and a stable voltage is output to the excitation coil in the heating plate. The voltage will change the inductance strength of the excitation heating plate, and then change the magnetic field strength. Similarly, if the temperature exceeds the set value, the voltage is reduced and the magnetic field is weakened. If the temperature is lower than the set value, the voltage is increased to ensure that the current temperature always meets the set temperature.

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