Battery baking apparatus and baking method thereof

Abstract

The embodiment of the application provides a battery baking device and a baking method thereof, and relates to the technical field of battery manufacturing. The device is used for the coordinated drying of a battery in multiple physical fields. A generator is connected in parallel to an oven, a vacuum pump is connected in series to the oven, a valve assembly is used for switching the working states of the vacuum pump and the generator, and a heating plate is arranged in the oven and is in contact with the battery for heat conduction. The battery baking device and the baking method thereof can efficiently drive the desorption and migration of strongly adsorbed moisture in the battery, and improve the drying depth and time economy of the baking process.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery baking apparatus and baking method thereof. Background Technology

[0002] Heating components are widely used in battery manufacturing processes to remove internal moisture before electrolyte injection into the battery cell, thereby ensuring the battery's electrochemical performance and safety.

[0003] In related technologies, a baking device is used to dry the battery, including an oven, a vacuum pump, an inert gas supply unit, and a valve assembly. The oven has a cavity for accommodating the battery, the vacuum pump is used to evacuate the cavity, the inert gas supply unit is used to introduce nitrogen into the cavity and perform multiple cycles of replacement, and the valve assembly is used to control the gas flow between the vacuum pump and the oven, and between the inert gas supply unit and the oven.

[0004] However, the drying devices in the aforementioned technologies have poor drying effects on batteries, which affects battery performance. Summary of the Invention

[0005] This application provides a battery baking device and a baking method to improve the drying effect of the battery and thus ensure battery performance.

[0006] A first aspect of this application provides a battery baking apparatus, comprising: an oven having a cavity for accommodating a battery; a vacuum pump connected to the oven for evacuating the interior of the oven; a generator connected to the oven for ionizing dry gas into ionized wind and filling the oven; and a valve assembly for controlling the gas flow between the vacuum pump and the oven, and the valve assembly also for controlling the gas flow between the generator and the oven.

[0007] The battery baking device provided in this application embodiment uses a generator to ionize dry gas into ionized wind, which is then introduced into the oven. The high-speed purging and charge effect of the ionized wind disrupt the air boundary layer on the battery surface and weaken the binding energy of water molecules, thereby improving the desorption efficiency of strongly adsorbed moisture inside the battery. A valve assembly is used to uniformly control the on / off of the vacuum pump, generator, and oven, enabling rapid switching between vacuum and ionized wind modes on the same gas channel, avoiding the structural complexity and leakage risks caused by multiple pipelines. The vacuum pump and generator share a single interface path for connecting to the oven, improving the device integration and space utilization, and reducing equipment manufacturing and maintenance costs. The ionized wind is introduced under positive pressure, subjecting the oven cavity to a micro-compression action from the outside in, ensuring sealing reliability under high-temperature conditions.

[0008] In one possible implementation, it also includes:

[0009] The main gas pipeline is connected at one end to the interior of the oven;

[0010] The first branch pipeline is connected to the vacuum pump at one end and to the main gas pipeline at the other end.

[0011] The second branch pipeline is connected to the generator at one end and to the main gas pipeline at the other end.

[0012] The valve assembly includes a first valve and a second valve;

[0013] The first valve is located in the first branch and is used to control the connection and disconnection between the vacuum pump and the main gas pipeline.

[0014] The second valve is installed in the second branch pipeline and is used to control the connection and disconnection between the generator and the main gas pipeline.

[0015] In one possible implementation, both the first valve and the second valve are high-vacuum valves.

[0016] In one possible implementation, the generator includes:

[0017] The housing has an air inlet for receiving dry gas and an air outlet connected to the oven.

[0018] An electrode assembly is disposed within the housing and is used to ionize the dry gas entering the housing into an ion wind;

[0019] A power source, connected to the electrode assembly, is used to provide electrical energy to the electrode assembly.

[0020] In one possible implementation, the electrode assembly includes:

[0021] The launcher is positioned near the air inlet;

[0022] The collector electrode is located near the air outlet. The emitter and the collector electrode work together to ionize the air inside the housing and generate ion wind.

[0023] In one possible implementation, a vacuum gauge is also included;

[0024] The vacuum gauge is installed in the oven and is used to detect the air pressure value inside the cavity in real time.

[0025] In one possible implementation, a controller is also included;

[0026] The controller is electrically connected to the vacuum gauge and the valve assembly, respectively.

[0027] The controller is configured to control the opening and closing state of the valve assembly based on the air pressure value detected by the vacuum gauge, so that one of the vacuum pump and the generator is connected to the oven.

[0028] In one possible implementation, the oven is provided with a clamp for holding the battery, and a heating plate is provided on the clamp for heating the battery.

[0029] This application also provides a battery baking method using the battery baking apparatus described above, comprising:

[0030] Oven, vacuum pump, and generator are provided;

[0031] Place the battery into the oven, turn on the vacuum pump and evacuate the oven to a first preset threshold, then turn off the vacuum pump;

[0032] Turn on the generator and inject ion air into the evacuated oven. When the air pressure inside the oven rises to the second preset threshold, turn off the generator and perform the first stage of pressure holding.

[0033] The battery inside the oven, which has reached the second preset threshold, is heated to the target baking temperature;

[0034] While maintaining the target baking temperature in the oven, the vacuum pump is turned on and the oven is evacuated to the first preset threshold. Then, the vacuum pump is turned off and a second stage of pressure holding is performed.

[0035] Repeat steps three and five above.

[0036] In one possible implementation, after repeating steps three and five above until drying is complete, the process further includes:

[0037] Stop heating the battery and perform at least one vacuuming and / or ionization air injection operation on the oven to lower the battery temperature and perform a third stage of pressure holding.

[0038] In one possible implementation, after stopping the heating of the battery and performing at least one vacuuming and / or ionizing air injection operation on the oven to lower the battery temperature and perform a third-stage pressure holding, the method further includes:

[0039] Heat the battery in the oven again to the target baking temperature, and repeat steps three and five above.

[0040] In one possible implementation, the first preset threshold is less than or equal to 10 Pa;

[0041] And / or, the second preset threshold is greater than or equal to 90 kPa and less than or equal to 100 kPa;

[0042] And / or, the target baking temperature is greater than or equal to 90°C and less than or equal to 105°C. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the structure of a battery drying device provided in an embodiment of this application;

[0045] Figure 2 This is a schematic diagram of the structure of a transmitter provided in an embodiment of this application;

[0046] Figure 3 A flowchart illustrating a drying method using the battery drying apparatus of this application is provided as an embodiment of this application;

[0047] Figure 4 A flowchart illustrating a second drying method using the battery drying apparatus of this application, provided as an embodiment of this application;

[0048] Figure 5 A flowchart illustrating a third drying method using the battery drying apparatus of this application, provided as an embodiment of this application.

[0049] Explanation of reference numerals in the attached figures:

[0050] 10. Battery;

[0051] 100. Oven;

[0052] 110. Cavity;

[0053] 200. Vacuum pump;

[0054] 300. Generator;

[0055] 310. Housing; 320. Electrode assembly; 330. Power supply;

[0056] 311. Air inlet; 312. Air outlet; 321. Emitter; 322. Collector;

[0057] 400. Valve assembly;

[0058] 410. First valve; 420. Second valve;

[0059] 500. Main gas pipeline;

[0060] 600. First branch pipeline;

[0061] 700. Second branch pipeline;

[0062] 800, Vacuum gauge;

[0063] 900, Controller.

[0064] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0065] As described in the background section, the drying devices in the aforementioned related technologies have poor drying effects on batteries, which affects battery performance.

[0066] The reason for this problem is that traditional baking devices rely on static vacuum desorption and macroscopic airflow replacement, without constructing a multi-physics synergistic mechanism: although vacuum can reduce water vapor partial pressure, it has limited effect on weakening the hydrogen bond and electrostatic binding energy between strongly adsorbed water molecules and electrode materials; simple positive pressure purging airflow lacks charge disturbance capability, making it difficult to destroy the static boundary layer on the battery surface and regulate the interface potential.

[0067] This application provides a battery baking device and method. A generator is used to ionize dry gas into ionized air, which is then introduced into an oven. The high-speed purging and charge effect of the ionized air disrupts the air boundary layer on the battery surface and weakens the binding energy of water molecules, thereby improving the desorption efficiency of strongly adsorbed moisture inside the battery. A valve assembly is used to uniformly control the on / off connection between the vacuum pump, generator, and oven, enabling rapid switching between vacuum and ionized air modes on the same gas channel, avoiding the structural complexity and leakage risks associated with multiple pipelines. The vacuum pump and generator share a single interface path for connecting to the oven, improving device integration and space utilization, and reducing equipment manufacturing and maintenance costs. The ionized air is introduced under positive pressure, subjecting the oven cavity to a slight inward compression, ensuring reliable sealing under high-temperature conditions.

[0068] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0069] refer to Figure 1 , Figure 2 and Figure 3 In some embodiments, this application provides a battery 10 baking apparatus, which may include an oven 100, a vacuum pump 200, a generator 300, and a valve assembly 400.

[0070] Oven 100 is used to house battery 10, and its interior has a cavity 110 for housing battery 10. Vacuum pump 200 is connected to oven 100 for evacuating the interior of oven 100. Generator 300 is connected to oven 100 for ionizing dry gas into ionized wind and filling oven 100. Valve assembly 400 is used to control the gas flow between vacuum pump 200 and oven 100, and valve assembly 400 is also used to control the gas flow between generator 300 and oven 100.

[0071] Oven 100 refers to a heat treatment device with a sealed cavity 110 structure, capable of withstanding vacuum and positive pressure conditions, and equipped with temperature control functions. Its cavity 110 is made of stainless steel or aluminum alloy, and the inner wall is polished or passivated to reduce surface adhesion. The door of oven 100 is equipped with double silicone sealing rings and a vacuum flange interface to ensure airtightness under vacuum and positive pressure conditions.

[0072] The vacuum pump 200 refers to a mechanical or molecular pumping device that can extract gas from the sealed cavity 110 to reduce the gas pressure. It is one of a rotary vane vacuum pump 200, a molecular pump, or a dry screw vacuum pump 200, and the pumping speed is matched with the volume of the cavity 110.

[0073] The generator 300 refers to an ionization device capable of ionizing the incoming dry gas to generate a high-speed gas flow containing positive and negative ions. The dry gas introduced into the generator 300 is high-purity nitrogen, dry compressed air, or argon.

[0074] The valve assembly 400 refers to an integrated multi-port vacuum valve or a discrete dual-valve structure, used to independently control the gas flow between the vacuum pump 200 and the oven 100, and between the generator 300 and the oven 100. When the valve assembly 400 is in its first operating state, it connects only the vacuum pump 200 and the oven 100 to achieve vacuuming. When the valve assembly 400 is in its second operating state, it connects only the generator 300 and the oven 100 to achieve ionization air filling.

[0075] The above technical solution achieves the following technical effects: A generator 300 is installed to ionize the dry gas into ion wind, which is then introduced into the oven 100. The high-speed purging and charge effect of the ion wind disrupt the air boundary layer on the surface of the battery 10 and weaken the binding energy of water molecules, thereby improving the desorption efficiency of strongly adsorbed moisture inside the battery 10. A valve assembly 400 is installed to uniformly control the connection between the vacuum pump 200, the generator 300, and the oven 100, enabling rapid switching between vacuum and ion wind modes on the same gas channel, avoiding the structural complexity and leakage risks caused by multiple pipelines. The vacuum pump 200 and the generator 300 share a common interface path for connecting to the oven 100, improving device integration and space utilization, and reducing equipment manufacturing and maintenance costs. The ion wind is introduced under positive pressure, subjecting the oven 100 cavity 110 to a slight inward compression, ensuring sealing reliability under high-temperature conditions.

[0076] refer to Figures 1 to 3 In some embodiments, the battery 10 baking device provided in this application also includes a main gas pipeline 500, a first branch pipeline 600, a second branch pipeline 700, a first valve 410, and a second valve 420.

[0077] One end of the main gas line 500 is connected to the interior of the oven 100. One end of the first branch line 600 is connected to the vacuum pump 200, and the other end is connected to the main gas line 500. One end of the second branch line 700 is connected to the generator 300, and the other end is connected to the main gas line 500. A first valve 410 is located in the first branch line and is used to control the connection between the vacuum pump 200 and the main gas line 500. A second valve 420 is located in the second branch line 700 and is used to control the connection between the generator 300 and the main gas line 500.

[0078] The main gas pipeline 500 refers to a stainless steel rigid pipe or a flexible corrugated metal pipe, the inner diameter of which is set according to the actual gas flow requirements. One end of the main gas pipeline 500 is sealed to an interface on the side wall of the oven 100 via a flange or welding. The location of this interface is selected according to the structural layout of the oven 100, either at the top, side, or bottom, and is set in the upper part of the oven 100 cavity 110 to facilitate uniform gas distribution. The main gas pipeline 500 serves as a gas manifold shared by the vacuum pump 200 and the generator 300, reducing the number of openings in the oven 100 body and improving overall sealing reliability.

[0079] The first branch pipe 600 refers to a branch pipe section made of the same material as the main gas pipe 500. One end of it is connected to the main gas pipe 500 via a tee connector, and the other end is connected to the exhaust port of the vacuum pump 200 via a quick-connect fitting or flange structure. The first valve 410 installed in the first branch pipe 600 is a high-vacuum butterfly valve, a high-vacuum angle valve, or a high-vacuum solenoid valve, and its sealing level meets the requirement of ≤1×10 -9 Pa·m 3 The leakage rate requirement is set at / s to ensure that the system can achieve an ultimate vacuum of less than 10 Pa during the vacuuming stage. The opening and closing of the first valve 410 is driven by an electrical signal from the controller 900, or it can be operated locally using a manual knob.

[0080] The second branch line 700 refers to a stainless steel rigid pipe or a metal flexible pipe, one end of which is connected to the main gas line 500 via a tee connector, and the other end is connected to the gas outlet 312 of the generator 300. The second valve 420 installed in the second branch line 700 has the same type and sealing performance requirements as the first valve 410. When working together, they achieve complete time-time isolation between the vacuum pump 200 and the generator 300. When closed, the second valve 420 can withstand pressure fluctuations in the ion wind output by the generator 300, and its rated operating pressure range is 0 kPa-120 kPa, with the specific value set according to the maximum output gas pressure of the generator 300.

[0081] When a vacuuming operation is required in the oven 100, the controller 900 closes the second valve 420 and opens the first valve 410, connecting the vacuum pump 200 to the oven 100 via the first branch pipe 600 and the main gas pipe 500. At this time, the generator 300 is disconnected. When ionizing air needs to be introduced into the oven 100, the controller 900 closes the first valve 410 and opens the second valve 420, allowing the generator 300 to supply ionizing air to the oven 100 via the second branch pipe 700 and the main gas pipe 500. At this time, the vacuum pump 200 is completely isolated. The first valve 410 and the second valve 420 are not opened simultaneously to prevent reverse airflow or ionized gas backflow into the vacuum pump 200 due to pressure difference, which could cause contamination or damage.

[0082] Through the above technical solution, this application achieves the following: Because a shared main gas pipeline 500 is provided, and independently controlled first valves 410 and second valves 420 are configured respectively, the connection timing of the vacuum pump 200 and generator 300 can be precisely controlled, preventing mutual interference between functional modules. Since both first valves 410 and second valves 420 adopt high-vacuum sealing structures, stable operation of the system under low-pressure conditions can be ensured. Because the main gas pipeline 500 reduces the number of openings in the oven 100 body, the overall sealing performance and structural strength of the cavity 110 are improved.

[0083] refer to Figures 1 to 3 In some embodiments, both the first valve 410 and the second valve 420 are high vacuum valves.

[0084] The first valve 410 is suitable for vacuum levels not lower than 10. -3 For Pa operation, it can be a high-vacuum butterfly valve, high-vacuum angle valve, or high-vacuum slide gate valve. Its sealing surface is made of fluororubber, all-metal (such as stainless steel / oxygen-free copper), or ceramic composite material, and it can achieve ≤1×10 Pa at a cavity pressure of 110 Pa. -9 Pa·m 3 / s leakage rate. The first valve 410 is installed in the first branch pipeline 600 to reliably cut off the passage between the vacuum pump 200 and the main gas pipeline 500 during the vacuuming stage, preventing the pressure of the cavity 110 from rising due to poor sealing.

[0085] The second valve 420 may be of the same or different type as the first valve 410. It can be a high-vacuum bellows-sealed shut-off valve or a high-vacuum solenoid valve. Its valve body is made of stainless steel, and its inner surface is electrolytically polished to reduce the outgassing rate and the risk of particle shedding. The second valve 420 is installed in the second branch pipeline 700 to quickly establish a low-resistance passage between the generator 300 and the main gas pipeline 500 during the ion wind charging stage, and to maintain the static sealing of the oven 100 cavity 110 at a gas pressure of 90 kPa-100 kPa when closed.

[0086] In this process, the first valve 410 and the second valve 420 work together to achieve the timing switch between the vacuum pump 200 and the generator 300 on the main gas pipeline 500 under the command of the controller 900: when the vacuum gauge 800 detects that the gas pressure in the cavity 110 is higher than the first preset threshold (≤10 Pa), the controller 900 controls the first valve 410 to open and the second valve 420 to close, initiating the vacuuming process. When the gas pressure drops below the first preset threshold and remains stable, the controller 900 controls the first valve 410 to close and the second valve 420 to open, switching to the ion wind charging process. This switching process is completed within ≤2 seconds and is repeated no less than 5 times during the entire baking cycle, while maintaining the consistency of vacuum degree and charging pressure in each cycle.

[0087] Through the above technical solution, this application achieves the following: since both the first valve 410 and the second valve 420 are high vacuum valves, the leakage rate can be effectively suppressed during the vacuuming stage, ensuring that the cavity 110 can stably maintain a vacuum level of ≤10 Pa.

[0088] refer to Figures 1 to 3 In some embodiments, generator 300 includes housing 310, electrode assembly 320, and power supply 330.

[0089] The housing 310 has an air inlet 311 for receiving dry gas and an air outlet 312 for connecting to the oven 100; the electrode assembly 320 is disposed inside the housing 310 and is used to ionize the dry gas entering the housing 310 into ion wind; the power supply 330 is connected to the electrode assembly 320 and is used to provide electrical energy to the electrode assembly 320.

[0090] The housing 310 refers to a sealed cavity 110 structure made of insulating and pressure-resistant material. For example, it can be a stainless steel shell lined with a polytetrafluoroethylene (PTFE) coating, or it can be a one-piece molded structure of ceramic or polymer composite material, forming a channel for the flow of drying gas. The air inlet 311 of the housing 310 is connected to an external source of dry compressed air. A filter is installed at the air inlet 311 to further remove particles and residual moisture. A pressure regulating valve and a flow meter are installed in the pipeline between the air inlet 311 and the dry air source to control the pressure and flow rate of the dry gas entering the housing 310. The specific parameters are set according to the actual situation.

[0091] The air outlet 312 is located at the end of the housing 310 away from the air inlet 311, and its opening direction faces the battery 10 arrangement area inside the oven 100 so that the ion wind can directly act on the surface of the battery 10. The overall size, wall thickness, and internal cavity cross-sectional shape (e.g., circular, rectangular, or elliptical) of the housing 310 are adjusted according to the installation space of the generator 300 and the ion wind output requirements, and this application embodiment does not impose any special limitations on these aspects.

[0092] The electrode assembly 320 is a high-voltage discharge structure. The electrode assembly 320 is fixed to the inner wall of the housing 310 or suspended by an insulating bracket to ensure electrical isolation from the metal parts of the housing 310. The specific configuration, material, geometry, and relative position of the electrode assembly 320 can be adaptively adjusted according to the type, flow rate, and required ion wind intensity of the drying gas; this embodiment does not impose any special limitations on these aspects.

[0093] Here, power supply 330 refers to a power supply module capable of outputting DC high voltage or pulsed high voltage. For example, it can be a high-voltage DC power supply 330 with an output voltage range of ±5 kV to ±30 kV and an output current of no more than 1 mA, or a high-frequency pulse power supply 330 with a frequency of 1 kHz to 100 kHz and an adjustable duty cycle. The positive and negative terminals of power supply 330 are connected to the emitter and collector 322, respectively, thereby establishing a stable and controllable strong electric field between them.

[0094] In this process, dry gas (such as compressed air with a dew point below -40°C or high-purity nitrogen) enters the housing 310 through the air inlet 311. Under the action of the high-voltage electric field formed by the electrode assembly 320, the gas molecules are ionized, generating a large number of positive and negative ions and a small number of active particles (such as ozone and hydroxyl radicals). Driven by the electric field force, the ions accelerate along the direction of the electric field and collide with neutral gas molecules to form a macroscopic directional airflow, i.e., ion wind. This ion wind carries kinetic energy and charge characteristics, and after being ejected from the air outlet 312, it enters the cavity 110 of the oven 100, acting on the surface and gap area of ​​the battery 10. Through a combination of physical and chemical mechanisms, such as high-speed purging, turbulent disturbance, electrostatic adsorption, and weakening the binding energy of water molecules, it promotes the migration and removal of moisture inside the battery 10.

[0095] Through the above technical solution, this application achieves the following: Since the generator 300 adopts a closed shell 310 structure and integrates an air inlet 311 and an air outlet 312, it is easy to connect with the air circuit system of the oven 100, thus improving the overall airtightness and integration of the device; Since the electrode assembly 320 is arranged in a specific spatial relationship inside the shell 310, and the power supply 330 can output high voltage in an adjustable manner, it can stably generate ion wind with sufficient energy and activity, ensuring the effective removal of moisture inside the battery 10.

[0096] refer to Figures 1 to 3 In some embodiments, electrode assembly 320 includes emitter 321 and collector 322.

[0097] The emitter 321 is positioned near the air inlet 311; the collector 322 is positioned near the air outlet 312. The emitter 321 and the collector 322 work together to ionize the air inside the housing 310 and generate ion wind.

[0098] The emitter 321 is a high-voltage discharge electrode disposed inside the housing 310 near the air inlet 311. Its structure is a needle-shaped, tooth-shaped, or sawtooth-shaped electrode, which is used to generate a strong electric field and induce tip corona discharge when high voltage is applied, so as to ionize the dry gas molecules entering the housing 310. The emitter 321 is made of stainless steel, tungsten, or molybdenum alloy, and its surface is chromium-plated or nitrided to enhance its resistance to electro-erosion. Its size and shape are set according to the actual required ionization intensity and airflow velocity. For example, the radius of curvature of the needle tip is 0.1 mm-0.5 mm. This application embodiment does not make any special limitation on this.

[0099] The collector electrode 322 is a grounded or low-potential electrode disposed within the housing 310 near the outlet 312. Its structure is annular, mesh, or flat, used to receive charged particles generated by the emitter 321 and guide the ion wind to accelerate directionally along the airflow direction under the action of the electric field gradient. The collector electrode 322 is made of aluminum alloy, copper, or stainless steel, and its surface is anodized or passivated to improve insulation stability. The distance between it and the emitter 321 is set according to the internal space of the housing 310 and the target ion wind velocity, for example, 10mm-50mm; this embodiment does not impose any special limitation on this.

[0100] The emitter 321 and the collector 322 together form a DC or pulsed high-voltage electric field region, which covers the main airflow path inside the casing 310 from the inlet 311 to the outlet 312. When dry gas flows into the casing 310 through the inlet 311, it is first ionized near the emitter 321 to generate positive and negative ions. Then, driven by the electric field, the ions migrate towards the collector 322, continuously colliding with neutral gas molecules and transferring momentum, thus forming an ion wind with macroscopic directional flow characteristics. This ion wind not only contains charged particles, but also a large number of neutral gas molecules that are dragged and move at high speed. The overall flow velocity is 3 m / s-15 m / s, and its directionality is better than that of ordinary airflow.

[0101] The arrangement of the emitter 321 near the inlet 311 ensures that the newly entered dry gas is immediately ionized in its initial state—undisturbed, with the lowest humidity and highest molecular density—which is beneficial for improving the ionization conversion rate per pass. The arrangement of the collector 322 near the outlet 312 provides a stable potential reference surface at the end of the ion migration path. This not only constrains the electric field distribution and prevents edge breakdown but also captures some of the reverse-escaping charged particles through electrostatic adsorption, reducing charge loss and thus improving the current density and energy utilization of the ion wind.

[0102] Through the above technical solutions, this application achieves the following: Because the emitter 321 is positioned close to the air inlet 311, efficient ionization can be achieved in the initial stage of gas entry, increasing the ion yield per unit volume of gas. Because the collector 322 is positioned close to the air outlet 312, the electric field area can be effectively constrained and ion output can be guided, enhancing the velocity stability and directional concentration of the ion wind. Since the emitter 321 and collector 322 are arranged front and back along the airflow direction, they collaboratively construct a continuous and controllable ionization-acceleration-output link, reducing the proportion of unionized gas and improving the efficiency of ion wind in replacing moisture on the surface of the battery 10.

[0103] refer to Figures 1 to 3 In some embodiments, the battery 10 baking apparatus provided in this application also includes a vacuum gauge 800; the vacuum gauge 800 is disposed in the oven 100 and is used to detect the air pressure value in the cavity 110 in real time.

[0104] The vacuum gauge 800 is a sensor used to measure gas pressure below atmospheric pressure, with a measurement range covering the low to high vacuum range. The vacuum gauge 800 is directly mounted to the side wall or top cover of the oven 100 housing 310 via a flange or threaded interface, with its sensing end extending into the cavity 110 to ensure that the measured gas pressure value accurately reflects the actual pressure state of the environment in which the battery 10 is located. This mounting position can be adjusted according to the uniformity of airflow distribution inside the oven 100, for example, by placing it in the upper part of the cavity 110 near the air outlet 312, or in the middle of the cavity 110 to avoid the direct path of heat radiation from the heating plate, thus preventing temperature drift from affecting measurement accuracy.

[0105] The vacuum gauge 800 continuously collects real-time air pressure data within the cavity 110 and transmits this data to the control system in real time. When the air pressure drops to a first preset threshold (e.g., ≤10 Pa), the controller 900 triggers the closure of the first valve 410 on the vacuum pump 200 side. When the air pressure rises to a second preset threshold (e.g., ≥90 kPa and ≤100 kPa), the controller 900 triggers the closure of the second valve 420 on the generator 300 side. This closed-loop feedback mechanism ensures that both the vacuuming and ionization processes are under control, avoiding over-vacuuming, under-filling, or pressure overshoot caused by manual judgment or timing control. During multiple baking cycles, the vacuum gauge 800 can also record pressure change curves at each stage for process parameter traceability and quality analysis.

[0106] Through the above technical solution, this application achieves accurate, continuous and reliable sensing of the air pressure state inside the cavity 110 of the oven 100; since a vacuum gauge 800 is set and directly integrated into the oven 100 body, the real pressure information of the microenvironment where the battery 10 is located can be obtained in real time, thereby solving the problem of misjudgment of process timing caused by lack of real-time pressure feedback, and improving the consistency, controllability and automation level of the baking process.

[0107] refer to Figures 1 to 3 In some embodiments, the battery 10 baking apparatus provided in this application further includes a controller 900. The controller 900 is electrically connected to a vacuum gauge 800 and a valve assembly 400, respectively. The controller 900 is configured to control the opening and closing state of the valve assembly 400 according to the air pressure value detected by the vacuum gauge 800, so that one of the vacuum pump 200 and the generator 300 is connected to the oven 100.

[0108] The controller 900 refers to an embedded microcontroller 900, a programmable logic controller 900 (PLC), or an industrial computer. It possesses data acquisition, logic operation, and output control functions, receiving real-time pressure signals from the vacuum gauge 800 and generating corresponding control commands based on preset pressure threshold ranges and process timing logic. The input port of the controller 900 is electrically connected to the analog or digital output terminal of the vacuum gauge 800 to obtain continuously or periodically updated pressure values ​​within the cavity 110. The output port of the controller 900 is electrically connected to the drive circuits of the first valve 410 and the second valve 420, enabling independent control of the opening or closing of each valve, thereby selectively switching the access paths of the vacuum pump 200 and the generator 300.

[0109] The controller 900 internally stores at least two sets of gas pressure judgment conditions: a first preset threshold is used to determine whether to start the vacuuming operation, and this threshold is less than or equal to 10 Pa. A second preset threshold is used to determine whether to start the ion wind charging operation, and this threshold is greater than or equal to 90 kPa and less than or equal to 100 kPa. The controller 900 can also automatically shield the responses of non-associated valves according to the current process stage. For example, it can lock the opening permission of the second valve 420 during vacuuming and lock the opening permission of the first valve 410 during ion wind charging to avoid gas path conflicts. The control logic of the controller 900 can be set according to actual conditions, such as supporting manual / automatic mode switching, online parameter modification, fault alarm output, and operation log recording functions. This application embodiment does not impose special limitations on these aspects.

[0110] The controller 900 is configured to: when the vacuum gauge 800 detects that the air pressure inside the cavity 110 is higher than a first preset threshold (e.g., 10 Pa), output a control signal to open the first valve 410 and keep the second valve 420 closed, thereby connecting the vacuum pump 200 and the oven 100 to perform a vacuuming operation. When the air pressure drops below the first preset threshold and remains stable for a set time (e.g., 30 s), the controller 900 outputs a signal to close the first valve 410, cutting off the vacuum pump 200's path. Subsequently, when the controller 900 determines that the ion wind replacement stage has begun, it outputs a signal to open the second valve 420 and keep the first valve 410 closed, connecting the generator 300 and the oven 100 to begin charging ion wind. When the vacuum gauge 800 detects that the air pressure inside the cavity 110 rises to a second preset threshold (e.g., 100 kPa), the controller 900 outputs a signal to close the second valve 420, terminating the ion wind charging. Throughout the process, the controller 900 continuously collects data from the vacuum gauge 800 and dynamically adjusts the valve status, forming a closed-loop feedback control mechanism to ensure that the pressure changes at each process stage conform to the preset trajectory.

[0111] Through the above technical solution, this application achieves the following: Since the controller 900 can respond in real time to the pressure changes detected by the vacuum gauge 800 and precisely control the opening and closing timing of the first valve 410 and the second valve 420 accordingly, the problem of unstable process cycle caused by the difficulty in coordinating multiple actuators during manual operation is solved. The controller has built-in multi-level pressure criteria and interlocking logic, thus avoiding short circuits or abnormal pressure caused by simultaneous connection of the vacuum pump 200 and the generator 300. The controller 900 can support repeated execution of the vacuuming → ionizing air cycle according to preset logic, thus ensuring the reliable execution of complex baking processes. The controller 900 has configurable parameters, thus adapting to different battery specifications 10 and differentiated baking process requirements.

[0112] refer to Figures 1 to 3 In some embodiments, the battery 10 baking apparatus provided in this application includes a clamp inside the oven 100 for supporting the battery 10, and a heating plate on the clamp for heating the battery 10.

[0113] The clamp refers to a support frame or tray structure made of metal, such as aluminum alloy, stainless steel, or copper alloy, which have good thermal conductivity and mechanical strength. Its shape and size can be adapted to the specifications of the battery 10 to be baked; for example, it can be a rectangular array of support slots, an arc-shaped fitting bracket, or an adjustable-spacing slide rail structure. This application does not impose special limitations on the specific structural form of the clamp, as long as it can stably support the battery 10 and achieve effective thermal contact with the heating plate.

[0114] The heating plate refers to an electric heating element embedded inside the fixture, such as a resistance wire heating plate, a PTC ceramic heating plate, a silicone heating sheet, or a flexible printed circuit heating film. The rated operating temperature range of the heating plate can be set according to the baking process requirements of the battery 10, for example, 80℃~120℃; its surface can be covered with an insulating high-temperature resistant coating to ensure electrical safety. This application does not impose special limitations on the specific type, power density, or installation method of the heating plate.

[0115] The heating plate is used to heat the battery 10 by directly conducting heat to the battery 10 casing 310 or the tab area through physical contact, thereby increasing the overall temperature of the battery 10 and promoting the migration of internal moisture. This heating method is different from the traditional air convection heating in the cavity of the oven 100, and has the characteristics of fast thermal response, small temperature gradient, high energy utilization and low risk of local overheating. Under the synergistic effect of vacuum and ion wind, the stable heat source provided by the heating plate can accelerate the desorption of water molecules from the pores of the electrode material and be carried out by the ion wind, forming a multi-physical field coupled drying mechanism of heat-driven, vacuum suction, electric field activation and airflow replacement.

[0116] When the heating plate is powered on, it generates Joule heat, which is conducted through the clamp to the bottom or side of the battery 10 in contact with it. During the heating process of the battery 10, the binding energy of the adsorbed water and the crystal water inside decreases with the increase of temperature. At the same time, the vacuum environment further reduces the vaporization pressure of water, making it easier for water to change from solid / liquid phase to gas phase. At this time, the ion wind introduced not only provides the gas replacement power, but its charged particles can also weaken the electrostatic adsorption force between water molecules and electrode materials, and destroy the static air boundary layer on the surface of the battery 10 through turbulent disturbance, which significantly improves the mass transfer rate of water vapor diffusion into the oven cavity 110.

[0117] Through the above technical solution, this application achieves the following: Since the fixture integrates a heating plate, the heating method of the battery 10 changes from external convection to internal contact conduction, improving heat transfer efficiency and temperature uniformity; because the heating plate acts directly on the load-bearing parts of the battery 10, heat loss within the cavity 110 is reduced, lowering system energy consumption. The heating plate can operate in conjunction with the vacuum and ion wind processes, thus constructing a deep dehydration mode with four coupled fields: heat, vacuum, electric field, and airflow, significantly improving baking efficiency and the thoroughness of moisture removal.

[0118] refer to Figures 1 to 3 In some embodiments, this application provides a battery baking method using the battery baking apparatus as described above, which includes the following steps.

[0119] S100 provides oven 100, vacuum pump 200, and generator 300.

[0120] S200, put the battery 10 into the oven 100, turn on the vacuum pump 200 and evacuate the oven 100 to the first preset threshold, then turn off the vacuum pump 200.

[0121] S300, turn on generator 300 and inject ion air into the vacuum oven 100. When the air pressure inside oven 100 rises to the second preset threshold, turn off generator 300 and perform the first stage of pressure holding.

[0122] S400 heats the battery 10 inside the oven 100, which has reached the second preset threshold, to the target baking temperature.

[0123] S500: While maintaining the target baking temperature inside the oven 100, the vacuum pump 200 is turned on and the oven 100 is evacuated to the first preset threshold. Then, the vacuum pump 200 is turned off and the second stage of pressure holding is performed.

[0124] S600, repeat steps three and five above until baking is complete.

[0125] The first preset threshold is a technical parameter used to characterize the extreme low-pressure state required to complete the initial degassing stage within the cavity 110 of the oven 100; this parameter is a pressure value ≤10 Pa, such as 5 Pa, 8 Pa, or 10 Pa. Its function is to significantly reduce the saturated vapor pressure of water molecules within the cavity 110, causing the adsorbed water inside the battery 10 to undergo a phase change and migrate to the surface. In step S200, the vacuum pump 200 is connected to the oven 100 through the main gas path 500 and the first branch line 600, establishing a suction path with the first valve 410 open, thus achieving rapid depressurization of the cavity 110. When the vacuum gauge 800 detects that the gas pressure inside the cavity 110 has stably reached the first preset threshold, the controller 900 outputs a command to close the first valve 410 and stop the vacuum pump 200, thereby blocking the suction path and preparing for the subsequent filling stage.

[0126] The second preset threshold is a technical parameter used to characterize the pressure of the target cavity 110 corresponding to the end of the ion wind charging stage and the entry into the pressure holding reaction stage. This parameter is a pressure value ≥90 kPa and ≤100 kPa, such as 90 kPa, 95 kPa, or 100 kPa. Its function is to ensure that the ion wind has sufficient kinetic energy to sweep the surface of the battery 10, destroy the static boundary layer, and maintain the sealing of the cavity 110 in a positive pressure environment slightly lower than atmospheric pressure to prevent external moisture from seeping back. In step S300, with the second valve 420 open, the generator 300 supplies ion wind to the main gas pipeline 500 through the second branch pipeline 700. The ion wind enters the cavity 110 of the oven 100 through the main gas pipeline, pushing the residual gas in the cavity out. At the same time, the charged particle group directly acts on the moisture on the surface of the battery 10, weakening its electrostatic binding energy with the electrode material.

[0127] The target baking temperature is a technical parameter used to characterize the intensity of thermal excitation received by the battery 10 during the ion wind pressure holding stage. This parameter can be a temperature value greater than or equal to 90°C and less than or equal to 105°C, such as 90°C, 95°C, 100°C, or 105°C. Its function is to provide the necessary thermal energy for the phase change of water, and at the same time, it works synergistically with the electric field effect of the ion wind to enhance the kinetic energy of water molecules, prompting them to overcome the surface barrier of the material and detach. In step S400, the heating plate is embedded inside the fixture, and heat is directionally transferred to the bottom of the battery 10 through thermal conduction, avoiding uneven temperature field caused by air convection in the cavity 110. The heating process is started at the second preset threshold pressure to ensure that the ion wind continuously acts on the surface of the battery 10 during the heating process, forming an electric-thermal-gas multi-field coupled drying condition.

[0128] Maintaining the target baking temperature within the oven 100 means simultaneously keeping the heating plate working during the vacuuming process, keeping the temperature fluctuation of the battery 10 within ±1℃. This state serves two purposes: firstly, it maintains the continuous vaporization capacity of the water inside the battery 10, preventing vaporization interruption due to cooling; secondly, it allows newly generated water vapor to quickly detach from the surface of the battery 10 under vacuum negative pressure and be extracted from the cavity 110, preventing it from re-condensing or being blown back by the ion wind. In step S500, the first valve 410 reopens, the vacuum pump 200 restarts, and the pressure in the cavity 110 quickly drops from the second preset threshold to the first preset threshold. Due to continuous heating, newly vaporized water vapor is always present in the cavity 110; the vacuuming process is essentially a dynamic dehydration process involving simultaneous vaporization and extraction.

[0129] The process of repeating steps three (S300) and five (S500) until baking is complete means that the above (ion wind injection + pressure holding) and (constant temperature vacuuming + pressure holding) are performed as a complete drying cycle unit, continuously at least once. The purpose of this cycle is that each round of ion wind injection actively removes water from the newly exposed internal interfaces of the battery 10 after the previous round of vacuuming, and each stage of vacuuming removes newly vaporized water in a timely manner, thus forming a progressive dehydration chain of exposure-removal-expansion. Compared to a single cycle, multiple cycles can penetrate deeper into the electrode pores layer by layer, effectively addressing the challenge of moisture gradient distribution in thick cells. By repeatedly performing steps three and five, the baking process of the battery 10 is completed only when the moisture content of the battery 10 reaches the target requirement, ensuring the dryness and performance of the battery 10.

[0130] Through the above technical solution, this application, by evacuating to a first preset threshold and then injecting ion wind to a second preset threshold and maintaining pressure, allows the charge and kinetic energy carried by the ion wind to act on the surface and near-field region of the battery 10, weakening the binding energy between water molecules and electrode materials and disrupting the mass transfer boundary layer. Then, while maintaining the target baking temperature, evacuation is repeated, allowing newly vaporized water to quickly detach from the battery 10 and be removed under negative pressure. By repeating this combination of ion wind injection and constant-temperature vacuuming, the layer-by-layer exposure, active expulsion, and immediate removal of moisture inside the battery 10 are achieved. The entire process relies on the aforementioned device structure, requiring no additional equipment or changes to the basic process logic, and can significantly improve the efficiency of deep moisture removal, shorten the overall baking cycle, and meet the stringent moisture control requirements of high-consistency power battery 10 manufacturing.

[0131] refer to Figures 1 to 4 In some embodiments, after repeating steps three (S300) and five (S500) as described above, the following steps are also included:

[0132] S700, stop heating the battery 10 and perform at least one vacuuming and / or ionizing air injection operation on the oven 100 to lower the temperature of the battery 10 and perform the third stage of pressure holding.

[0133] Stopping the heating of battery 10 means cutting off the electrical energy supplied to the heating plate installed on the internal fixture of oven 100, causing the heating plate to stop heating and enter a natural cooling state. This action directly terminates the continuous input of heat to battery 10 and is the starting control command that triggers the reconstruction of the internal temperature gradient of battery 10.

[0134] The operation of performing at least one vacuuming and / or ionizing air introduction on the oven 100 refers to switching the gas path on / off state through the valve assembly 400 after heating stops, connecting at least one of the vacuum pump 200 or generator 300 to the oven 100, and performing the corresponding gas handling action. This operation does not change the structure of the oven 100 cavity 110 or the heat conduction path, but only removes heat through gas flow, reduces the ambient temperature inside the cavity 110 and the heat exchange boundary layer temperature on the surface of the battery 10, thereby achieving a controllable decrease in the overall temperature of the battery 10. Vacuuming reduces the gas molecule density, weakening the convective heat transfer capacity while promoting the radiative dissipation of heat accumulated on the surface of the battery 10. Introducing ionizing air utilizes a high-speed, low-humidity, charged particle-rich dry airflow to enhance forced convective heat transfer, and disturbs the microenvironment on the surface of the battery 10 through ion adsorption, synergistically accelerating cooling. "And / or" indicates that the two operations can be performed individually, alternately, or simultaneously, and their combination is dynamically determined by the current gas pressure, temperature, and cooling rate requirements inside the cavity 110.

[0135] The temperature drop of battery 10 refers to a decrease in the overall average temperature of battery 10 by 5°C to 30°C, or optionally by 10°C to 20°C, compared to the target baking temperature at the end of the process. This temperature drop is sufficient to break the stagnation of moisture diffusion caused by continuous high temperature, and promote the migration of high-concentration moisture in the pores inside battery 10 to the electrode / separator interface, thereby rebuilding the concentration gradient and mass transfer driving force for moisture migration.

[0136] The third stage of pressure holding refers to the period after cooling is completed, during which all gas passages are closed, keeping the oven 100 in a sealed state and maintaining a constant pressure under the current gas pressure and temperature conditions. This pressure holding period provides sufficient time for moisture to redistribute from the inside of the battery 10 to the surface, avoiding uneven dehydration caused by rapid evaporation of surface moisture while internal moisture remains due to immediate subsequent heating; the pressure holding time is 30 min-120 min, with 60 min being an option.

[0137] Through the above technical solution, this application triggers heat source removal by stopping heating, and coordinates the internal thermal environment of the oven 100 by using two heat exchange mechanisms: vacuuming and / or introducing ion wind, causing the temperature of the battery 10 to decrease in stages. Based on this, a third-stage pressure holding mechanism maintains a stable pressure and temperature field, providing the necessary time and driving force for the reverse diffusion of moisture from the inside of the battery 10 to the surface. Ultimately, without introducing additional drying media or increasing the temperature, this effectively alleviates the phenomenon of surface migration due to vaporization, improving the efficiency and uniformity of moisture removal in subsequent baking stages.

[0138] refer to Figures 1 to 5 In some embodiments, after stopping heating of the battery 10 and performing at least one vacuuming and / or ionizing air operation on the oven 100 to lower the temperature of the battery 10 and perform a third stage of pressure holding, the following steps are also included.

[0139] S800, reheat the battery 10 in the oven 100 to the target baking temperature, and repeat steps three and five above.

[0140] The step of reheating the battery 10 inside the oven 100 to the target baking temperature means that after the third stage of pressure holding (i.e., the cooling and pressure holding stage) has been completed, the heating function inside the oven 100 is restarted, causing the temperature of the battery 10 to rise back to the set temperature range defined in this application for the main baking stage. In this embodiment, this technical feature restores the internal heat supply to the battery 10, enabling the newly enriched water that has migrated to the surface and near-surface layers after cooling to obtain sufficient energy to undergo a phase change and detach from the electrode material. This action constitutes a necessary closed loop for the cooling-re-migration process, providing an effective dehydration prerequisite for the subsequent round of vacuuming and ion wind replacement.

[0141] The repetition of steps three and five is a new technical feature, meaning that: starting from the state after completion, the following steps are re-executed as defined in this application: heating the battery 10 in the oven 100, which has reached the second preset threshold, to the target baking temperature (this step has been covered by the above, so it essentially refers to its subsequent action logic) and: while maintaining the target baking temperature in the oven 100 unchanged, turning on the vacuum pump 200 and evacuating the oven 100 to the first preset threshold, turning off the vacuum pump 200 and performing the second stage of pressure holding; the role of this technical feature in this embodiment is to: continue and strengthen the multi-cycle dynamic baking logic, and immediately start a new round of vacuum desorption-ion wind replacement synergy after the moisture is redistributed due to the thermal gradient, to ensure that the newly exposed moisture is removed in time and to avoid its re-adsorption or formation of local micro-condensation in the low temperature zone; this action together with the above constitutes a closed-loop control unit of thermal shock drive + airflow replacement response.

[0142] Through the above technical solution, this application achieves an active response to the dynamic changes in the internal moisture distribution of the battery 10 by restarting heating after the third stage of pressure holding and replicating the cyclic operation of vacuuming and introducing ion wind. By leveraging the coupling relationship between the moisture re-migration caused by cooling and the phase change driving force activated by reheating, the directional transport efficiency of moisture from deep layers to the surface is enhanced. This allows the ion wind to more fully contact and remove newly enriched moisture during the next round of replacement. Ultimately, without extending the single heat holding time, the total amount and uniformity of moisture removal from the entire batch of batteries 10 are significantly improved, making it particularly suitable for battery types with high areal density electrodes or stacked structures, which have high heat and mass transfer resistance.

[0143] refer to Figures 1 to 3 In some embodiments, the first preset threshold is less than or equal to 10 Pa; and / or, the second preset threshold is greater than or equal to 90 kPa and less than or equal to 100 kPa; and / or, the target baking temperature is greater than or equal to 90°C and less than or equal to 105°C.

[0144] The first preset threshold refers to the upper limit of the target gas pressure reached by the vacuum pump 200 in evacuating the cavity 110 of the oven 100 during the baking method of the battery 10. This first preset threshold is a key control parameter reflecting the residual gas density inside the cavity 110. The smaller the value, the more rarefied the gas inside the cavity 110, the longer the mean free path of water molecules, the lower the heat conduction efficiency, and the easier it is to break through the saturated vapor pressure required for the phase change of water. In this embodiment, the first preset threshold is used to limit the termination condition of the vacuuming stage. When the vacuum gauge 800 detects that the gas pressure inside the cavity 110 is ≤10Pa, the controller 900 controls the first valve 410 to close, stopping the vacuuming operation. This setting makes the partial pressure of residual water vapor inside the cavity 110 significantly lower than the vapor pressure corresponding to the binding energy of water molecules on the surface of the battery 10 material, thereby driving water to migrate from the inside of the electrode material pores to the surface and vaporize.

[0145] The second preset threshold refers to the lower limit of the target air pressure reached after the generator 300 fills the oven 100 with ion wind during the ion wind replacement stage. This second preset threshold is a coordinated control parameter characterizing the ion wind penetration capability and the structural safety of the cavity 110, and its value range covers a positive pressure range slightly lower than standard atmospheric pressure. In this embodiment, the second preset threshold is used to limit the termination condition of the ion wind filling stage. When the vacuum gauge 800 detects that the air pressure inside the cavity 110 is ≥90 kPa and ≤100 kPa, the controller 900 controls the second valve 420 to close, stopping the introduction of ion wind. This setting ensures that the ion wind has sufficient kinetic energy to penetrate the stacking gaps of the battery 10 and the microporous structure of the electrode, and avoids the risk of deformation of the seal or accidental opening of the oven 100 door due to excessive pressure difference inside and outside the cavity 110.

[0146] The target baking temperature refers to the constant temperature value applied and maintained by the heating plate to the battery 10 during the pressure holding and heating stage. This target baking temperature is a core process parameter that balances heat energy supply and material thermal stability. Its lower limit must be sufficient to provide the activation energy required for moisture to detach from the electrode material, and its upper limit must be lower than the onset temperature of the separator thermal shrinkage and the decomposition temperature of the electrolyte precursor. In this embodiment, the target baking temperature is used to define the thermal boundary conditions of the heating stage. After the heating plate on the fixture raises the surface temperature of the battery 10 to the range of 90°C to 105°C and maintains it stably, the first stage of pressure holding begins. This setting allows moisture to be accelerated from the solid matrix under the dual action of ion wind disturbance and thermal drive, and then carried out by the ion wind through the gas phase.

[0147] Through the above technical solution, this application ensures that the partial pressure of water vapor in the cavity 110 is sufficiently reduced during the vacuuming stage by limiting the first preset threshold to ≤10Pa, thus creating a thermodynamic driving force for subsequent water vaporization. The second preset threshold is set to 90kPa~100kPa, allowing the ion wind to maintain high flow rate and strong disturbance characteristics under near-normal pressure conditions, enhancing its penetration ability into the gaps of the battery 10 and its ability to peel off surface-adsorbed water. By controlling the target baking temperature within the range of 90℃~105℃, sufficient energy is provided to facilitate the detachment of water from the material bonding sites, while avoiding side reactions such as separator thermal shrinkage, adhesive aging, or aluminum current collector oxidation caused by high temperatures. The synergistic effect of these three factors constitutes a closed-loop baking process window with clear physical boundaries, controllable energy input, and measurable process response, significantly improving the consistency, repeatability, and industrial adaptability of the battery 10 baking process.

[0148] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0149] It should be noted that phrases such as "in specific implementations," "in some embodiments," "in this embodiment," and "exemplarily" in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0150] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0151] It should be readily understood that “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on something” but also “on something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0152] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0153] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery baking device, characterized in that, include: An oven with an internal cavity for housing batteries; A vacuum pump, connected to the oven, is used to create a vacuum inside the oven; A generator, connected to the oven, is used to ionize dry gas into ionized wind and fill the oven; A valve assembly is used to control the gas flow between the vacuum pump and the oven, and the valve assembly is also used to control the gas flow between the generator and the oven.

2. The battery baking apparatus according to claim 1, characterized in that, Also includes: The main gas pipeline is connected at one end to the interior of the oven; The first branch pipeline is connected to the vacuum pump at one end and to the main gas pipeline at the other end. The second branch pipeline is connected to the generator at one end and to the main gas pipeline at the other end. The valve assembly includes a first valve and a second valve; The first valve is located in the first branch and is used to control the connection and disconnection between the vacuum pump and the main gas pipeline. The second valve is installed in the second branch pipeline and is used to control the connection and disconnection between the generator and the main gas pipeline.

3. The battery baking apparatus according to claim 2, characterized in that, Both the first valve and the second valve are high vacuum valves.

4. The battery baking apparatus according to claim 1, characterized in that, The generator includes: The housing has an air inlet for receiving dry gas and an air outlet connected to the oven. An electrode assembly is disposed within the housing and is used to ionize the dry gas entering the housing into an ion wind; A power source, connected to the electrode assembly, is used to provide electrical energy to the electrode assembly.

5. The battery baking apparatus according to claim 4, characterized in that, The electrode assembly includes: The launcher is positioned near the air inlet; The collector electrode is located near the air outlet. The emitter and the collector electrode work together to ionize the air inside the housing and generate ion wind.

6. The battery baking apparatus according to claim 1, characterized in that, It also includes vacuum gauges; The vacuum gauge is installed in the oven and is used to detect the air pressure value inside the cavity in real time.

7. The battery baking apparatus according to claim 6, characterized in that, It also includes the controller; The controller is electrically connected to the vacuum gauge and the valve assembly, respectively. The controller is configured to control the opening and closing state of the valve assembly based on the air pressure value detected by the vacuum gauge, so that one of the vacuum pump and the generator is connected to the oven.

8. The battery baking apparatus according to claim 1, characterized in that, The oven is equipped with a clamp for holding the battery, and a heating plate is mounted on the clamp to heat the battery.

9. A battery baking method using the battery baking apparatus as described in any one of claims 1 to 8, characterized in that, include: Oven, vacuum pump, and generator are provided; Place the battery into the oven, turn on the vacuum pump and evacuate the oven to a first preset threshold, then turn off the vacuum pump; Turn on the generator and inject ion air into the evacuated oven. When the air pressure inside the oven rises to the second preset threshold, turn off the generator and perform the first stage of pressure holding. The battery inside the oven, which has reached the second preset threshold, is heated to the target baking temperature; While maintaining the target baking temperature in the oven, the vacuum pump is turned on and the oven is evacuated to the first preset threshold. Then, the vacuum pump is turned off and a second stage of pressure holding is performed. Repeat steps three and five.

10. The battery baking method according to claim 9, characterized in that, After repeating steps three and five until drying is complete, the process further includes: stopping the heating of the battery and performing at least one vacuuming and / or ionizing air operation on the oven to lower the battery temperature and perform a third-stage pressure holding.

11. The battery baking method according to claim 10, characterized in that, After stopping the heating of the battery and performing at least one vacuuming and / or ionizing air injection operation on the oven to lower the battery temperature and perform a third-stage pressure holding, the method further includes: Heat the battery in the oven again to the target baking temperature, and repeat steps three and five above.

12. The battery baking method according to claim 9, characterized in that, The first preset threshold is less than or equal to 10 Pa; And / or, the second preset threshold is greater than or equal to 90 kPa and less than or equal to 100 kPa; And / or, the target baking temperature is greater than or equal to 90°C and less than or equal to 105°C.

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