Battery baking method and device and readable storage medium

Abstract

The invention provides a battery baking method and device and a readable storage medium, and relates to the technical field of batteries. The method comprises the steps that in the battery baking process, multiple pressure values at different moments in a furnace cavity are obtained, and it is determined that the water content of a battery meets the requirement according to the multiple pressure values so that baking of the battery can be stopped. In the battery baking process, the multiple pressure values at different moments in the oven cavity are obtained, the pressure change in the oven cavity can be judged according to the multiple pressure values, and therefore whether the water content of the battery meets the requirement or not can be determined according to the pressure change in the oven cavity. When the water content of the battery meets the requirement, baking can be stopped in time, the baking time is shortened, and the baking efficiency can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery baking method, device and readable storage medium. Background Art

[0002] The water content of the battery has an important impact on the battery's capacity, cycle performance, and internal resistance. Therefore, in the battery manufacturing process, it is necessary to reduce the water content of the battery by baking. During the baking process, the battery is placed in the furnace chamber of a vacuum furnace for baking, and the furnace chamber is evacuated cyclically to allow the water in the battery to fully evaporate under vacuum to reduce the water content of the battery.

[0003] Among them, it is difficult to accurately measure the water content of the battery during the battery baking process, so it is difficult to judge whether the water content of the battery meets the requirements. In order to avoid the situation where the water content exceeds the standard, a longer baking time is usually set to allow the water in the battery to fully evaporate after a long period of baking. Although this method can reduce the situation where the water content exceeds the standard, it is impossible to stop baking in time when the water content reaches the requirement, resulting in a longer baking time and thus lower baking efficiency. Summary of the invention

[0004] The embodiments of the present application provide a battery baking method, device and readable storage medium, which can shorten the baking time during the battery baking process and improve the baking efficiency.

[0005] In a first aspect, a battery baking method is provided, the method comprising:

[0006] During the battery baking process, multiple pressure values ​​at different times in the furnace chamber are obtained;

[0007] It is determined according to the multiple pressure values ​​that the water content of the battery meets the requirement, so as to stop baking the battery.

[0008] In the embodiment of the present application, multiple pressure values ​​at different times in the oven cavity are obtained during the battery baking process, and the pressure change in the oven cavity can be judged according to the multiple pressure values, so that it can be determined whether the water content of the battery meets the requirement according to the pressure change in the oven cavity, and the battery baking is stopped when it is determined that the water content meets the requirement. In this way, the baking can be stopped in time when the water content of the battery meets the requirement, shortening the baking time, thereby improving the baking efficiency.

[0009] Moreover, during the baking process, it is not necessary to test the water content of the battery by an experimental battery, which simplifies the baking process and can further improve the baking efficiency. At the same time, the shortening of the baking time can also reduce the energy consumed during the baking process, thereby reducing the baking cost.

[0010] In some embodiments, determining that the water content of the battery meets the requirement according to the multiple pressure values ​​includes:

[0011] determining a rate of change of pressure in the furnace chamber according to the plurality of pressure values;

[0012] The water content of the battery is determined to meet the requirement according to the pressure change rate in the furnace chamber.

[0013] In an embodiment of the present application, the pressure change rate in the furnace cavity is detected during the baking process. By judging the pressure change rate in the furnace cavity, it is possible to indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the amount of water content in the battery, the pressure change rate can be used to more accurately determine whether the water content of the battery meets the requirement.

[0014] In some embodiments, the pressure change rate in the oven cavity includes the pressure change rate in the oven cavity during a current baking cycle, and determining that the water content of the battery meets the requirement based on the pressure change rate in the oven cavity includes: determining that the water content of the battery meets the requirement when the pressure change rate in the current baking cycle is less than or equal to a preset change rate.

[0015] In an embodiment of the present application, the pressure change rate of the current baking cycle in the inner furnace cavity is detected during the baking process. By judging the pressure change rate in the furnace cavity, it is possible to indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the amount of water content in the battery, the pressure change rate can be used to more accurately determine whether the water content of the battery meets the requirement.

[0016] In some embodiments, the pressure change rate in the oven cavity includes the pressure change rate of multiple consecutive baking cycles in the oven cavity, and determining that the water content of the battery meets the requirement based on the pressure change rate in the oven cavity includes: when the pressure change rate of the multiple consecutive baking cycles is less than or equal to a preset rate, determining that the water content of the battery meets the requirement.

[0017] In an embodiment of the present application, the pressure change rate of multiple consecutive baking cycles in the furnace cavity is determined during the baking process. Based on the pressure change rate of multiple consecutive baking cycles, the pressure change in the furnace cavity during the baking process can be determined more accurately, thereby accurately determining the water content in the battery, and further more accurately determining whether the water content in the battery meets the requirements.

[0018] In some embodiments, the plurality of pressure values ​​include a first pressure value at the beginning of the toasting cycle and a second pressure value at the end of the toasting cycle.

[0019] In an embodiment of the present application, in the process of obtaining multiple pressure values ​​at different times in the oven cavity, a first pressure value at the beginning of the baking cycle and a second pressure value at the end of the baking cycle are obtained, and the pressure change rate of the baking cycle is determined based on the first pressure value and the second pressure value, which can reduce the amount of data and improve detection efficiency.

[0020] In some embodiments, the method further includes: in each baking cycle, if it is detected that the pressure in the oven cavity reaches a preset pressure, determining that the baking cycle is over, and determining the detected pressure value as a second pressure value at the end of the baking cycle.

[0021] In the embodiment of the present application, the end of the current baking cycle is determined when the pressure in the furnace chamber rises to a preset pressure, so that the pressure in the furnace chamber in each baking cycle is not higher than the preset pressure, so that the moisture in the battery can evaporate at a higher rate in each baking cycle, thereby improving the baking efficiency of the battery.

[0022] In some embodiments, the method further comprises: introducing drying gas into the furnace chamber at regular intervals.

[0023] In the embodiment of the present application, dry gas is introduced into the furnace cavity once at regular intervals. Dry gas can be introduced into the furnace cavity periodically to reduce the water content in the furnace cavity, which can facilitate the volatilization of moisture in the battery into the furnace cavity during the baking process, thereby improving the baking efficiency of the battery.

[0024] In some embodiments, the step of introducing dry gas into the oven cavity once at regular intervals includes: introducing dry gas into the oven cavity once before each baking cycle starts.

[0025] In the embodiment of the present application, dry gas is introduced into the furnace cavity before the start of each baking cycle, which can reduce the water content in the furnace cavity during the baking cycle, thereby facilitating the volatilization of moisture in the battery into the furnace cavity during the baking cycle, thereby improving the baking efficiency of the battery.

[0026] In some embodiments, the step of introducing dry gas into the oven cavity once at regular intervals includes: introducing dry gas into the oven cavity once when the number of cycles of a current baking cycle reaches a target number of cycles.

[0027] In an embodiment of the present application, when the number of cycles of the current baking cycle is the target number of cycles, dry gas is introduced into the furnace cavity. While improving the volatilization efficiency of water in the battery, the frequency of introducing dry gas into the furnace cavity can be reduced, thereby improving the baking efficiency.

[0028] In a second aspect, a battery baking device is provided, the device comprising:

[0029] An acquisition module is used to obtain multiple pressure values ​​in the furnace chamber at different times during the battery baking process;

[0030] The determination module is used to determine whether the water content of the battery meets the requirement according to the multiple pressure values, so as to stop baking the battery.

[0031] In some embodiments, the determination module is specifically used to determine the pressure change rate in the furnace cavity according to the multiple pressure values; and determine whether the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity.

[0032] In some embodiments, the pressure change rate in the oven cavity includes the pressure change rate in the oven cavity during a current baking cycle, and the determination module is specifically used to determine that the water content of the battery meets the requirements when the pressure change rate in the current baking cycle is less than or equal to a preset change rate.

[0033] In some embodiments, the pressure change rate in the furnace cavity includes the pressure change rate of multiple consecutive baking cycles in the furnace cavity, and the determination module is specifically used to determine that the water content of the battery meets the requirements when the pressure change rate of the multiple consecutive baking cycles is less than or equal to a preset rate.

[0034] In some embodiments, the plurality of pressure values ​​include a first pressure value at the beginning of the toasting cycle and a second pressure value at the end of the toasting cycle.

[0035] In some embodiments, the acquisition module is further used to determine that the baking cycle is over if it is detected that the pressure in the oven cavity reaches a preset pressure during each baking cycle, and determine the detected pressure value as a second pressure value at the end of the baking cycle.

[0036] In some embodiments, the device further comprises: an introduction module, configured to introduce dry gas into the furnace chamber once at regular intervals.

[0037] In some embodiments, the introduction module is specifically used to introduce dry gas into the oven cavity once before each baking cycle starts.

[0038] In some embodiments, the introduction module is specifically used to introduce a primary drying gas into the oven cavity when the number of cycles of the current baking cycle reaches a target number of cycles.

[0039] In a third aspect, a readable storage medium is provided, on which a computer program is stored. When the computer program is executed on a battery baking device, the battery baking device executes the battery baking method provided in the first aspect.

[0040] In a fourth aspect, a battery baking device is provided, comprising: a processor; a memory; and a computer program, wherein the computer program is stored in the memory, and when the computer program is executed by the processor, the screening device executes the battery baking method provided in the first aspect.

[0041] In a fifth aspect, a computer program product is provided, comprising: a computer program code, when the computer program code is run on a battery baking device, the battery baking device executes the battery baking method provided in the first aspect.

[0042] In a sixth aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that a battery baking device equipped with the chip executes the battery baking method provided in the aforementioned first aspect.

[0043] It can be understood that the battery baking devices provided in the second and fourth aspects, the readable storage medium provided in the third aspect, the computer program product provided in the fifth aspect, and the chip provided in the sixth aspect are all used to execute the battery baking method provided in the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the composition of a baking system provided in some examples of the present application is shown.

[0045] Figure 2 A flow chart of the steps of a battery baking method provided in some embodiments of the present application is shown.

[0046] Figure 3 A schematic diagram showing the pressure change rate during a baking process provided in some examples of the present application is shown.

[0047] Figure 4 A control flow diagram of a baking process provided by some embodiments of the present application is shown.

[0048] Figure 5 A schematic diagram of the composition of another baking system provided in some examples of the present application is shown.

[0049] Figure 6 A schematic diagram of pressure changes in a furnace chamber during a baking process provided in some examples of the present application is shown.

[0050] Figure 7 A schematic flow chart of a battery baking method provided in some embodiments of the present application is shown.

[0051] Figure 8A schematic structural diagram of a battery baking device provided in an embodiment of the present application is shown.

[0052] Fig. 9 A structural block diagram of a battery baking device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0053] The technical solution in the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0054] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0055] The term "comprising" herein indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. Below, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, the meaning of "multiple" is two or more.

[0056] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0057] Batteries are also called battery cells or cells (hereinafter referred to as batteries). The water content of batteries has an important impact on the battery's capacity first effect, cycle performance and internal resistance. Taking lithium batteries as an example, when the water content of the battery is high, excess water will react with the lithium salt in the electrolyte, consume lithium ions, shorten the battery's discharge time, and thus reduce the battery's capacity first effect. At the same time, excess water will react with lithium salts to produce precipitates, which will cover the surface of the pole piece, hindering the entry and exit of lithium ions, and will deteriorate the battery's cycle performance and increase the internal resistance.

[0058] In order to reduce the water content of the battery, during the battery manufacturing process, the battery needs to be baked before liquid injection and packaging so that the water content of the battery is less than or equal to the specified value.

[0059] In the related art, in order to measure the water content of the battery during the baking process, the battery to be baked and the experimental battery are usually placed in the furnace chamber of a vacuum furnace at the same time, and the experimental battery is usually a defective product in the manufacturing process.

[0060] During the baking process, the sealed oven cavity is evacuated cyclically. Each evacuation corresponds to the beginning of a baking cycle, and the period between two adjacent evacuations is a baking cycle. That is, the oven cavity is evacuated once before each baking cycle, and the time when the evacuation ends is the start time of the baking cycle. During the baking cycle, the moisture in the battery evaporates continuously under vacuum.

[0061] After each baking cycle, the oven cavity is evacuated again and the next baking cycle is started. After baking for multiple baking cycles, the experimental battery in the oven cavity is taken out and the water content of the experimental battery is measured.

[0062] When the water content of the experimental battery is greater than the specified value, it is determined that the water content of the battery does not meet the requirements, and the experimental battery is placed in the furnace cavity to continue baking the battery. When the water content of the experimental battery is less than or equal to the specified value, it is determined that the water content of the battery meets the requirements.

[0063] Generally, there are some differences between the experimental battery and the battery to be baked. Although the experimental battery and the battery to be baked are baked at the same time and the baking conditions are the same, when the water content of the experimental battery meets the requirements, there is a certain probability that the water content of the battery to be baked does not meet the requirements. In order to avoid the situation where the water content exceeds the standard, after the water content of the experimental battery is determined to meet the requirements, it will continue to be baked for a period of time so that the water in the battery can fully evaporate, so as to reduce the probability of the battery having excessive water content.

[0064] Although the above method can reduce the probability of excessive water content, it is difficult to stop baking in time when the water content of the battery reaches the requirement because the water content is not accurately determined. The battery needs to be baked for a long time, resulting in low baking efficiency. At the same time, when measuring the water content through the experimental battery, it may be necessary to take out the experimental battery from the furnace cavity several times during the baking process to measure the water content. The operation is cumbersome, which further reduces the baking efficiency. Moreover, when the baking time increases, more energy is consumed during the baking process, resulting in a higher baking cost.

[0065] In order to solve the above problems, an embodiment of the present application provides a battery baking method, including: obtaining multiple pressure values ​​in the furnace chamber at different times during the battery baking process, and determining whether the water content of the battery meets the requirements based on the multiple pressure values ​​to stop baking the battery.

[0066] During the battery baking process, the water volatilized from the battery enters the vacuum chamber, which will cause the pressure in the chamber to change. The greater the water content of the battery, the more water volatilizes, and the more water volatilizes, the greater the pressure change in the chamber. Therefore, the amount of water volatilized from the battery can be determined based on the change in the chamber pressure, thereby determining whether the water content of the battery meets the requirements.

[0067] In the embodiment of the present application, multiple pressure values ​​at different times in the oven cavity are obtained during the battery baking process, and the pressure change in the oven cavity can be judged according to the multiple pressure values, so that it can be determined whether the water content of the battery meets the requirement according to the pressure change in the oven cavity, and the battery baking is stopped when it is determined that the water content meets the requirement. In this way, the baking can be stopped in time when the water content of the battery meets the requirement, shortening the baking time, thereby improving the baking efficiency.

[0068] Moreover, during the baking process, it is not necessary to test the water content of the battery by an experimental battery, which simplifies the baking process and can further improve the baking efficiency. At the same time, the shortening of the baking time can also reduce the energy consumed during the baking process, thereby reducing the baking cost.

[0069] Figure 1 The schematic diagram of the composition of a baking system provided in some examples of the present application is shown. Figure 1 As shown, the baking system includes a baking device 10 and a host computer 20. The baking device 10 includes a vacuum furnace 11, a controller 12, a data sampling device, a vacuum system, and the like.

[0070] The host computer 20 can be a device with control function such as a computer, a touch screen, an industrial computer, etc. The host computer 20 is connected to the controller 12 for communication and can send instructions to the controller 12 so that the controller 12 controls the operation of the baking device 10 .

[0071] The controller 12 is, for example, a programmable logic controller (PLC) or other types of devices with control functions. The controller 12 can obtain various parameters required in the baking process from the host computer 20 to control the operation of the entire baking device 10.

[0072] A tray 17 is provided in the furnace chamber of the vacuum furnace 11. The tray 17 is, for example, an aluminum plate, for placing the battery 18. A heating element (not shown in the figure) is provided at the bottom of the tray 17. The heating element is, for example, a heating film and a heating tube. The heating element is connected to the controller 12, and the controller 12 can control the heating element to start or stop.

[0073] The vacuum pumping system includes a vacuum pump 13 and a vacuum valve 14. The vacuum pump 13 is connected to the furnace chamber of the vacuum furnace 11 through a vacuum pipe 19. The vacuum valve 14 is arranged on the vacuum pipe 19. The controller 12 is connected to the vacuum pump 13 and the vacuum valve 14, and can control the start or stop of the vacuum pump 13 and the opening or closing of the vacuum valve 14. When the vacuum valve 14 is opened and the vacuum pump 13 is started, the vacuum pump 13 can evacuate the vacuum furnace 11.

[0074] The data sampling device includes a temperature sensor 15 and a pressure sensor 16. The temperature sensor 15 is, for example, a temperature probe. The detection end of the temperature probe is arranged in the furnace chamber of the vacuum furnace 11, and the temperature in the furnace chamber can be sampled. The pressure sensor 16 is, for example, a vacuum gauge. The vacuum gauge is connected to the furnace chamber, and the pressure in the furnace chamber (pressure is also called vacuum value) can be sampled. The controller 12 is connected to the temperature sensor 15 and the pressure sensor 16 respectively, and can obtain the temperature value sampled by the temperature sensor 15 and the pressure value sampled by the pressure sensor 16.

[0075] During the battery baking process, the battery 18 is first placed on the tray 17, and the furnace cavity of the vacuum furnace 11 is sealed. Then, the controller 12 can control the heating element to start heating the furnace cavity, and heating the furnace cavity means heating the battery 18 in the furnace cavity. Before each baking cycle starts, the controller 12 first controls the vacuum valve 14 to open and controls the vacuum pump 13 to start, and vacuumizes the furnace cavity of the vacuum furnace 11 through the vacuum pump 13, and then controls the vacuum valve 14 to close and controls the vacuum pump 13 to stop, starting a baking cycle, so that the battery 18 is baked in a vacuum state.

[0076] After each baking cycle is finished, the controller 12 controls the vacuum valve 14 to open again, and controls the vacuum pump 13 to start evacuating the furnace chamber of the vacuum furnace 11, and starts the next adjacent baking cycle.

[0077] It should be noted that Figure 1 For illustrative purposes only, the components of the baking system may include but are not limited to the above examples.

[0078] Figure 2 A flowchart of a battery baking method provided by some embodiments of the present application is shown. The method can be Figure 1 The controller 12 implementation shown may include steps 21 and 22 .

[0079] Step 21: During the battery baking process, multiple pressure values ​​in the furnace chamber at different times are obtained.

[0080] In some embodiments, before starting to bake the battery cells, the controller can start the heating element in the furnace cavity, and the heating element continues to operate during each baking cycle to heat the battery placed in the furnace cavity. Before each baking cycle starts, the controller can open the vacuum valve and start the vacuum pump to evacuate the furnace cavity of the vacuum furnace so that the furnace cavity is in a vacuum state. During the baking cycle, the battery is heated in a vacuum environment, and the moisture in the battery continuously evaporates into the furnace cavity. After each baking cycle, the controller can open the vacuum valve again and start the vacuum pump to evacuate the furnace cavity of the vacuum furnace to start the next adjacent baking cycle.

[0081] like Figure 1 As shown, during the baking process, the controller 12 can sample the pressure in the oven cavity through the pressure sensor 16 at different sampling times to obtain multiple pressure values ​​in the oven cavity at different times. For example, during the baking process, the controller 12 can sample a pressure value in the oven cavity through the pressure sensor 16 at regular intervals to obtain multiple pressure values ​​in the oven cavity at different times.

[0082] For another example, the controller 12 may sample the pressure value in the oven cavity at different sampling times through the pressure sensor 16 after each baking cycle starts, so as to obtain multiple pressure values ​​in the oven cavity at different times. Alternatively, the controller 12 may continuously sample the pressure in the oven cavity at different sampling times through the pressure sensor 16 within a period of time before the end of each baking cycle, with a certain time interval between two adjacent sampling times, so as to obtain multiple pressure values ​​of the pressure in the oven cavity at different times within a period of time before the end of the baking cycle.

[0083] The above are merely illustrative examples, and specific methods for obtaining multiple pressure values ​​in the furnace chamber at different times may include but are not limited to the above examples.

[0084] Step 22: Determine, based on the multiple pressure values, whether the water content of the battery has reached the requirement, so as to stop baking the battery.

[0085] For example, if the multiple pressure values ​​obtained include multiple pressure values ​​within a period of time before the end of a baking cycle, the controller can determine whether the multiple pressure values ​​within a period of time before the end of the baking cycle are greater than the preset pressure value. If the multiple pressure values ​​are all greater than the preset pressure value, it can be determined that more water in the battery evaporates into the oven cavity, so that it can be determined that the battery contains more water and the water content of the battery does not meet the requirement. On the contrary, if the multiple pressure values ​​are all less than or equal to the preset pressure value, it can be determined that less water in the battery evaporates into the oven cavity, so that it can be determined that the water content of the battery meets the requirement.

[0086] For example, if the multiple pressure values ​​acquired at different times include multiple pressure values ​​within a baking cycle, the pressure change curve in the furnace cavity can be fitted according to the multiple continuous pressure values ​​within a baking cycle, and the water content of the battery can be determined to meet the requirement according to the slope of the pressure change curve, or the water content of the battery can be determined to not meet the requirement according to the slope of the pressure change curve.

[0087] Exemplarily, if the multiple pressure values ​​obtained include pressure values ​​within different baking cycles, the multiple pressure values ​​can be input into a pre-trained neural network model, and the neural network model determines through the multiple pressure values ​​whether the water content in the battery meets the requirements, or determines through the multiple pressure values ​​whether the water content in the battery does not meet the requirements.

[0088] The above are merely illustrative examples, and specific methods for determining that the water content of a battery meets the requirements based on multiple pressure values ​​may include but are not limited to the above examples.

[0089] In some embodiments, after determining that the water content of the battery has reached the requirement, the baking of the battery can be stopped directly. For example, after determining that the water content of the battery has reached the requirement, the controller can control the heating element to stop running, stop starting the vacuum pump to evacuate the furnace chamber, and then output a notification message to inform the staff that the battery baking is completed.

[0090] In other embodiments, after determining that the water content of the battery has reached the requirement, the battery can be stopped from being baked for a period of time. For example, after determining that the water content of the battery has reached the requirement, the controller can continue to control the heating element to operate for a period of time, and continue to cyclically control the vacuum valve to open, and control the vacuum pump to start to evacuate the furnace chamber, and stop baking the battery after continuing to bake the battery for several baking cycles.

[0091] Among them, after determining that the water content of the battery meets the requirement, if the battery is continued to be baked for a period of time, the water content of the battery can be further reduced, thereby reducing the probability of the water content of the battery exceeding the standard.

[0092] It should be noted that the above method can be Figure 1 The controller 12 shown is implemented, and can also be implemented by the host computer 20. When implemented by the host computer 20, the host computer 20 can send a control instruction to the controller 12. After receiving the control instruction, the controller 12 controls the vacuum valve 14 to open or close, and controls the vacuum pump 13 to start or stop. At the same time, the host computer 20 can obtain the temperature value sampled by the temperature sensor 15 and the pressure value sampled by the pressure sensor 16 through the controller 12.

[0093] In the embodiment of the present application, multiple pressure values ​​at different times in the oven cavity are obtained during the battery baking process, and the pressure change in the oven cavity can be judged according to the multiple pressure values, so that it can be determined whether the water content of the battery meets the requirement according to the pressure change in the oven cavity, and the battery baking is stopped when it is determined that the water content meets the requirement. In this way, the baking can be stopped in time when the water content of the battery meets the requirement, shortening the baking time, thereby improving the baking efficiency.

[0094] Moreover, during the baking process, it is not necessary to test the water content of the battery by an experimental battery, which simplifies the baking process and can further improve the baking efficiency. At the same time, the shortening of the baking time can also reduce the energy consumed during the baking process, thereby reducing the baking cost.

[0095] Optionally, step 22 may include:

[0096] determining a rate of change of pressure within the furnace chamber based on a plurality of pressure values;

[0097] The water content of the battery meets the requirement according to the pressure change rate in the furnace chamber.

[0098] For example, if the multiple pressure values ​​obtained include pressure values ​​in different baking cycles, the pressure change rate in the oven cavity during the baking process can be calculated and determined based on the multiple pressure values. For example, if two pressure values ​​at different times are obtained, and the two pressure values ​​are respectively in different baking cycles, the pressure difference between the two pressure values ​​can be calculated, and the time difference between the sampling time of one pressure value and the sampling time of the other pressure value can be calculated. Then, the ratio between the pressure difference and the time difference is calculated, and the calculated ratio is determined as the pressure change rate in the oven cavity during the baking process.

[0099] For another example, if multiple pressure values ​​at different times are obtained, and the number of pressure values ​​is greater than 2, the pressure difference between two adjacent pressure values ​​at the sampling time can be calculated respectively, and the time difference between the sampling times of the two pressure values ​​can be calculated, and the ratio between the pressure difference and the time difference can be calculated to obtain a pressure change rate to obtain multiple pressure change rates. After obtaining multiple pressure change rates, the average value of the multiple pressure change rates is calculated, and the average value is determined as the pressure change rate in the oven cavity during the baking process.

[0100] For another example, if multiple pressure values ​​at different times are obtained, the pressure difference between the earliest pressure value and the latest pressure value can be determined, and the time difference between the sampling times of the two pressure values ​​can be calculated. Then, the ratio between the pressure difference and the time difference is calculated to obtain the pressure change rate in the oven cavity during the baking process.

[0101] In some embodiments, after obtaining the pressure change rate in the oven cavity during baking, the pressure change rate can be compared with a preset change rate. When the pressure change rate is less than or equal to the preset change rate, it is determined that the water content in the battery is lower than a specified amount and the water content of the battery meets the requirement. On the contrary, when the pressure change rate is greater than the preset change rate, it is determined that the water content of the battery does not meet the requirement.

[0102] During the battery baking process, the water volatilized from the battery enters the vacuum chamber, which will increase the pressure in the chamber. The more water volatilized, the greater the pressure change rate in the chamber. When the pressure change rate in the chamber drops below the preset change rate, it means that the water content of the battery is low and has dropped below the specified value, and the water content of the battery meets the requirement.

[0103] Figure 3 A schematic diagram showing the pressure change rate during a baking process provided in some examples of the present application is shown. Figure 3 The horizontal axis is time, the unit is minute (min), the vertical axis is the pressure change rate, the unit is Pa per minute (Pa / min), and the curve 31 is the pressure change rate in the furnace chamber.

[0104] like Figure 3 As shown, during the entire baking process, the pressure change rate in the oven cavity gradually decreases, and the pressure change rate V2 is a pressure change rate at the end of baking. When the pressure change rate is less than or equal to the preset change rate V, it can be determined that the water content of the battery has reached the requirement, so as to stop baking the battery.

[0105] In an embodiment of the present application, the pressure change rate in the furnace cavity is detected during the baking process. By judging the pressure change rate in the furnace cavity, it is possible to indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the amount of water content in the battery, the pressure change rate can be used to more accurately determine whether the water content of the battery meets the requirement.

[0106] Optionally, the determined pressure change rate in the oven cavity includes the pressure change rate in the oven cavity during the current baking cycle, and the step of determining whether the water content of the battery meets the requirement based on the pressure change rate in the oven cavity may include: determining that the water content of the battery meets the requirement when the pressure change rate in the current baking cycle is less than or equal to a preset change rate.

[0107] In some embodiments, the multiple pressure values ​​obtained may include multiple pressure values ​​at different times in the current baking cycle, and the pressure change rate of the current baking cycle in the oven cavity can be determined according to the multiple pressure values ​​at different times in the current baking cycle, and whether the water content of the battery meets the requirements can be determined according to the pressure change rate of the current baking cycle. The current baking cycle is the baking cycle currently in progress, and the current baking cycle can be any baking cycle in the baking process.

[0108] For example, if the multiple pressure values ​​obtained include two pressure values ​​at different times in the current baking cycle, the pressure difference between the two pressure values ​​can be calculated, and the time difference between the sampling time of one pressure value and the sampling time of the other pressure value can be calculated. Then, the ratio between the pressure difference and the time difference is calculated, and the ratio is determined as the pressure change rate of the current baking cycle in the oven cavity.

[0109] For another example, if the multiple pressure values ​​obtained include multiple pressure values ​​at different times in the current baking cycle, and the number of pressure values ​​is greater than 2, the pressure difference between two adjacent pressure values ​​at the sampling time can be calculated respectively, and the time difference between the sampling times of the two pressure values ​​can be calculated, and the ratio between the pressure difference and the time difference can be calculated to obtain a pressure change rate to obtain multiple pressure change rates. After obtaining the multiple pressure change rates, the average value of the multiple pressure change rates is calculated, and the average value is determined as the pressure change rate of the current baking cycle in the oven cavity.

[0110] For another example, if the multiple pressure values ​​obtained include multiple pressure values ​​at different times in the current baking cycle, the pressure difference between the pressure value with the earliest sampling time and the pressure value with the latest sampling time among the multiple pressure values ​​can be determined, and the time difference between the sampling times of the two pressure values ​​can be calculated. Then, the ratio between the pressure difference and the time difference is calculated to obtain the pressure change rate in the current baking cycle in the oven cavity.

[0111] After obtaining the pressure change rate of the current baking cycle in the oven cavity, the pressure change rate of the current baking cycle can be compared with the preset change rate. When the pressure change rate of the current baking cycle is less than or equal to the preset change rate, it is determined that the water content in the battery is low, so that it can be determined that the water content of the battery meets the requirement. On the contrary, when the pressure change rate of the current baking cycle is greater than the preset change rate, it is determined that the water content of the battery does not meet the requirement.

[0112] The above are merely illustrative examples, and the specific method for calculating the pressure change rate of the current baking cycle based on multiple pressure values ​​in the current baking cycle may include but is not limited to the above examples.

[0113] In an embodiment of the present application, the pressure change rate of the baking cycle in the inner furnace cavity is detected during the baking process. By judging the pressure change rate in the furnace cavity, it is possible to indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the amount of water content in the battery, the pressure change rate can be used to more accurately determine whether the water content of the battery meets the requirement.

[0114] Optionally, the pressure change rate in the furnace cavity includes the pressure change rate of multiple consecutive baking cycles in the furnace cavity, and the step of determining whether the water content of the battery meets the requirement based on the pressure change rate in the furnace cavity may include: when the pressure change rate of multiple consecutive baking cycles is less than or equal to a preset rate, determining that the water content of the battery meets the requirement.

[0115] In some embodiments, the multiple pressure values ​​obtained include pressure values ​​at different times in multiple consecutive baking cycles. The pressure change rate of each baking cycle in the oven cavity can be determined according to the pressure values ​​at different times in each baking cycle. If the pressure change rate of multiple consecutive baking cycles is less than or equal to the preset change rate, it is determined that the water content of the battery meets the requirements.

[0116] For example, in the process of obtaining multiple pressure values, two pressure values ​​at different times or multiple pressure values ​​at different times may be obtained in each baking cycle. In the process of calculating the pressure change rate, the pressure change rate of each baking cycle may be calculated based on the pressure values ​​at different times in each baking cycle.

[0117] For example, if the multiple pressure values ​​obtained include multiple pressure values ​​in the Nth (N is an integer greater than or equal to 1) baking cycle, multiple pressure values ​​in the (N+1)th baking cycle, multiple pressure values ​​in the (N+2)th baking cycle, and multiple pressure values ​​in the (N+3)th baking cycle. The pressure change rate in the oven cavity during the Nth baking cycle can be calculated, the pressure change rate in the oven cavity during the (N+1)th baking cycle can be calculated, the pressure change rate in the oven cavity during the (N+2)th baking cycle can be calculated, and the pressure change rate in the oven cavity during the (N+3)th baking cycle can be calculated. The method for calculating the pressure change rate of each baking cycle is the same as the method for calculating the pressure change rate of the current baking cycle.

[0118] After calculating the pressure change rate of each baking cycle, if the pressure change rate of the Nth baking cycle, the pressure change rate of the (N+1)th baking cycle, the pressure change rate of the (N+2)th baking cycle, and the pressure change rate of the (N+3)th baking cycle are all less than or equal to the preset change rate, it is determined that the water content in the battery meets the requirements.

[0119] In an embodiment of the present application, the pressure change rate of multiple consecutive baking cycles in the furnace cavity is determined during the baking process. Based on the pressure change rate of multiple consecutive baking cycles, the pressure change in the furnace cavity during the baking process can be determined more accurately, thereby accurately determining the water content in the battery, and further more accurately determining whether the water content in the battery meets the requirements.

[0120] Optionally, the plurality of pressure values ​​include a first pressure value at the beginning of the baking cycle and a second pressure value at the end of the baking cycle, and the first pressure value and the second pressure value are used to determine a pressure change rate of the baking cycle.

[0121] In some embodiments, in the process of obtaining multiple pressure values ​​at different times in the oven cavity, a first pressure value at the beginning of the baking cycle and a second pressure value at the end of the baking cycle can be obtained to obtain multiple pressure values ​​at different times.

[0122] For example, before each baking cycle begins, the pressure in the oven cavity may be evacuated to below the first preset pressure P1. Figure 1 As shown, before each baking cycle starts, the controller 12 controls the vacuum valve 14 to open and controls the vacuum pump 13 to start, and evacuates the oven cavity through the vacuum pump 13. After controlling the vacuum pump 13 to start, the controller 12 can sample the pressure in the oven cavity in real time through the pressure sensor 16 to continuously monitor the pressure in the oven cavity.

[0123] When the pressure in the oven cavity obtained by a certain sampling is less than or equal to the first preset pressure P1, it is determined that the pressure in the oven cavity drops below the first preset pressure P1, and the controller 12 can control the vacuum valve 14 to close and control the vacuum pump 13 to stop, so as to stop evacuating the oven cavity. When the vacuum pump 13 stops, a baking cycle begins. At this time, the controller 12 can use the pressure value obtained by sampling as the first pressure value P3 at the beginning of the baking cycle, or sample the pressure in the oven cavity again through the pressure sensor 16 to obtain the first pressure value P3 at the beginning of the baking cycle.

[0124] After the battery 18 enters a baking cycle, the heating element continues to operate to heat the battery 18, the vacuum valve 14 is in a closed state, the vacuum pump 13 is in a stopped state, the moisture in the battery 18 evaporates into the furnace cavity under a vacuum state, and the pressure in the furnace cavity continues to rise.

[0125] In some embodiments, the controller can control each baking cycle by duration. For example, the duration of each baking cycle can be preset to ΔT, and the controller starts timing each time the vacuum valve is closed and the vacuum pump is stopped. When the timing reaches ΔT, the baking cycle is determined to be over, and the pressure in the oven cavity is sampled by the pressure sensor, and the sampled pressure value is determined as the second pressure value P4 in the oven cavity at the end of the baking cycle.

[0126] Among them, when it is necessary to determine whether the water content of the battery meets the requirement based on the pressure change rate of the current baking cycle, after obtaining the first pressure value P3 at the beginning of the current baking cycle and the second pressure value P4 at the end of the current baking cycle, the controller can calculate the pressure difference between the second pressure value P4 and the first pressure value P3, and then calculate the ratio between the pressure difference and the cycle length ΔT to obtain the rate of change of the pressure in the furnace cavity during the current baking cycle.

[0127] Among them, when it is necessary to determine whether the water content of the battery meets the requirements based on the pressure change rate of multiple consecutive baking cycles, after obtaining the first pressure value P3 and the second pressure value P4 in multiple consecutive baking cycles, the pressure change rate of each baking cycle can be calculated respectively according to the first pressure value P3 and the second pressure value P4 in each baking cycle.

[0128] In an embodiment of the present application, in the process of obtaining multiple pressure values ​​at different times in the oven cavity, a first pressure value at the beginning of the baking cycle and a second pressure value at the end of the baking cycle are obtained, and the pressure change rate of the baking cycle is determined based on the first pressure value and the second pressure value, which can reduce the amount of data and improve detection efficiency.

[0129] In some embodiments, in each baking cycle, if it is detected that the pressure in the oven cavity reaches a preset pressure, it is determined that the baking cycle is ended, and the detected pressure value is determined as a second pressure value at the end of the baking cycle.

[0130] Figure 4 A schematic diagram of a control flow in a baking process provided by some embodiments of the present application is shown. Figure 4 As shown, before each baking cycle starts, the controller 12 first controls the vacuum valve to open and the vacuum pump to start, and evacuates the pressure in the oven cavity to below the first preset pressure P1, and then controls the vacuum valve to close and the vacuum pump to stop. After the pressure in the oven cavity is evacuated to below the first preset pressure P1, the controller determines that the baking cycle starts and starts timing.

[0131] Then, the controller 12 continuously samples the pressure in the oven cavity through the pressure sensor 16. When the pressure in the oven cavity obtained by a certain sampling is greater than or equal to the preset pressure (for the convenience of distinction, the preset pressure is called the second preset pressure P2), it can be determined that the baking cycle is over, and the pressure value obtained by sampling is used as the second pressure value P4 at the end of the baking cycle. Alternatively, the controller can sample the pressure in the oven cavity again through the pressure sensor 16, and determine the pressure value obtained by sampling as the second pressure value P4 at the end of the baking cycle. At the same time, the timing can be ended to obtain the timing duration, which is the cycle duration of the baking cycle.

[0132] In the process of calculating the pressure change rate of the baking cycle, the controller 12 can calculate the pressure difference between the first pressure value P3 and the second pressure value P4, and calculate the ratio between the pressure difference and the timing duration to obtain the change rate of the pressure in the oven cavity during the baking cycle.

[0133] In the embodiment of the present application, the end of the current baking cycle is determined when the pressure in the furnace chamber rises to a preset pressure, so that the pressure in the furnace chamber in each baking cycle is not higher than the preset pressure, so that the moisture in the battery can evaporate at a higher rate in each baking cycle, thereby improving the baking efficiency of the battery.

[0134] Optionally, the method may further include: introducing drying gas into the furnace chamber once at regular intervals.

[0135] Figure 5 FIG. 2 shows a schematic diagram of another baking system provided in some examples of the present application. Figure 5 As shown, the furnace chamber of the vacuum furnace 11 can be connected to a dry gas source 111 through a gas supply valve 110, and the gas supply valve 110 is connected to a controller 12. After the controller 12 controls the gas supply valve 110 to open, the dry gas in the dry gas source 111 can be introduced into the furnace chamber of the vacuum furnace 11. The dry gas can be a dry inert gas, such as nitrogen.

[0136] For example, the gas replenishment time can be preset, for example, 1 hour. The controller 12 starts timing after entering the first baking cycle, that is, the controller 12 starts timing after controlling the vacuum valve 14 to open for the first time and controlling the vacuum pump 13 to start evacuating the pressure in the furnace chamber to the first preset pressure P1. After the timing starts, when the timing reaches 1 hour, the controller 12 controls the gas replenishment valve 110 to open for the gas replenishment time and then close, and a certain amount of dry gas is introduced into the furnace chamber.

[0137] Then, the controller 12 can reset the timing time and restart the timing, and when the timing time reaches 1 hour next time, the controller 12 controls the air supply valve 110 to open for the air supply time and then close. The controller 12 performs timing in a cycle, and when the timing time reaches 1 hour, the controller controls the air supply valve 110 to open to introduce dry gas into the oven cavity until the baking is completed.

[0138] Among them, in the process of introducing dry gas into the furnace cavity at regular intervals, if the timing time reaches the gas replenishment time at the beginning of a baking cycle, dry gas can be introduced into the furnace cavity first, and then the vacuum pump can be controlled to start vacuuming the furnace cavity.

[0139] It should be understood that the duration of the gas replenishment can be 1 hour, 0.5 hours, or 1.5 hours, and the specific value of the gas replenishment time can include but is not limited to the above examples.

[0140] Among them, the dry gas can be mixed with the moisture in the furnace cavity. During the vacuum extraction process, the dry gas and the moisture can be discharged from the furnace cavity together, which can reduce the water content in the furnace cavity and facilitate the volatilization of moisture in the battery into the furnace cavity, thereby improving the baking efficiency of the battery.

[0141] In the embodiment of the present application, dry gas is introduced into the furnace cavity once at regular intervals. Dry gas can be introduced into the furnace cavity periodically to reduce the water content in the furnace cavity, which can facilitate the volatilization of moisture in the battery into the furnace cavity during the baking process, thereby improving the baking efficiency of the battery.

[0142] In some embodiments, dry gas may be introduced into the oven cavity once before each baking cycle, so that dry gas may be introduced into the oven cavity once every other baking cycle.

[0143] like Figure 5 As shown, before each baking cycle starts, the controller 12 can first control the air supply valve 110 to open, to introduce dry gas into the oven cavity, and then control the air supply valve 110 to close after the air supply valve 110 is opened for a preset air supply time, so as to introduce a certain amount of dry gas into the oven cavity. After the air supply valve 110 is closed, the controller 12 can control the vacuum valve 14 to open, and control the vacuum pump 13 to start to evacuate the oven cavity, evacuate the pressure in the oven cavity to below the first preset pressure P1, and then control the vacuum valve 14 to close, and control the vacuum pump 13 to stop, so as to start a baking cycle.

[0144] In the process of introducing the dry gas into the furnace chamber, the controller may also control the amount of the inert gas introduced into the furnace chamber in other ways.

[0145] like Figure 5As shown, the controller 12 determines that the baking cycle ends when it detects that the pressure in the furnace cavity reaches the second preset pressure P2. At this time, the controller 12 can control the air supply valve 110 to open, and detect the pressure in the furnace cavity through the pressure sensor 16. When the pressure in the furnace cavity reaches the third preset pressure, the air supply valve 110 is closed to stop the introduction of dry gas into the furnace cavity. Then, the controller 12 can control the vacuum valve 14 to open, and control the vacuum pump 13 to start evacuating the furnace cavity, and evacuate the pressure in the furnace cavity to below the first preset pressure P1 to start the next adjacent baking cycle. It should be understood that the method of introducing dry gas into the furnace cavity may include but is not limited to the above examples.

[0146] In the embodiment of the present application, dry gas is introduced into the furnace cavity before the start of each baking cycle, which can reduce the water content in the furnace cavity during the baking cycle, thereby facilitating the volatilization of moisture in the battery into the furnace cavity during the baking cycle, thereby improving the baking efficiency of the battery.

[0147] In some embodiments, when the number of cycles of the current baking cycle reaches the target number of cycles, a drying gas may be introduced into the oven cavity.

[0148] For example, the target cycle number may be an even number, and when the controller determines that the current baking cycle number is an even number, the controller may control the air supply valve to open before the current baking cycle starts, so as to introduce dry gas into the oven cavity. For example, after entering the first baking cycle, when the controller determines that the cycle number of the baking cycle is an odd number such as 1, 3, 5, 7, etc., after the baking cycle ends, the controller may determine that the cycle number of the current baking cycle is an even number, and the controller may control the air supply valve to open, so as to introduce dry gas into the oven cavity when the cycle number of the current baking cycle is an even number.

[0149] Exemplarily, the controller may introduce dry gas into the oven cavity once every preset number of baking cycles, so as to introduce dry gas into the oven cavity when the number of cycles of the current baking cycle is the target number of cycles. For example, the preset number is 4, and before the start of the first baking cycle, the controller may initialize the preset number of baking cycles to 0, and increase the number of baking cycles by 1 after each baking cycle is completed. Before the start of the current baking cycle, when the controller determines that the number of cycles of the current baking cycle is the target number of cycles such as 4, 8, 12, 16, etc., before the start of the current baking cycle, the controller first controls the air supply valve to open, introduces dry gas into the oven cavity, and then controls the vacuum valve to open, and controls the vacuum pump to start to evacuate the oven cavity.

[0150] Exemplarily, the target number of cycles may be a preset number of cycles. For example, the target number of cycles may be preset to be 4, 6, 11, 16, and 20. Before each baking cycle starts, the controller may count the number of baking cycles. When the number of cycles in the current baking cycle is a target number of cycles such as 4, 6, 11, 16, and 20, the controller may control the air supply valve to open before the current baking cycle starts, introduce dry gas into the oven cavity, and then control the vacuum valve to open and control the vacuum pump to start to evacuate the oven cavity.

[0151] Figure 6 A schematic diagram of pressure changes in a furnace chamber during a baking process provided in some examples of the present application is shown. Figure 6 The horizontal axis is time, in minutes; the vertical axis is pressure, in Pa; curve 61 is the pressure change curve in the furnace chamber.

[0152] Take one of the baking cycles as an example. The start time of the baking cycle is Figure 6 The time T1 shown, the end time is Figure 6 At the time T2 shown. Before the baking cycle starts, the controller controls the vacuum valve to open and the vacuum pump to start. At the time T1, the pressure in the oven cavity is evacuated to the first preset pressure P1. The controller controls the vacuum valve to close and the vacuum pump to stop, and the baking cycle starts. At the same time, at the time T2, the controller detects that the pressure in the oven cavity rises to the second preset pressure P2, and determines that the baking cycle ends. During the baking cycle, the pressure in the oven cavity rises from the first preset pressure P1 to the second preset pressure P2.

[0153] Take another baking cycle as an example. The start time of this baking cycle is Figure 6 The time T3 shown, the end time is Figure 6 The time T4 shown in the figure, and the number of cycles of the baking cycle is the preset target number of cycles. Before the baking cycle starts, the controller first controls the air supply valve to open, and introduces dry gas into the oven cavity. Then the controller controls the vacuum valve to open and the vacuum pump to start. At the time T3, the pressure in the oven cavity is evacuated to the first preset pressure P1, and the baking cycle starts. At the time T4, the controller detects that the pressure in the oven cavity rises to the second preset pressure P2, and the controller determines that the baking cycle ends.

[0154] Before the baking cycle starts, since dry gas is first introduced into the furnace chamber and then vacuumed, the pressure in the furnace chamber first rises to above pressure P5, is then vacuumed to the first preset pressure P1, and then rises from the first preset pressure P1 to the second preset pressure P2.

[0155] like Figure 3As shown, the pressure change rate V2 and the pressure change rate V3 are the pressure change rates in the furnace chamber after the dry gas is introduced.

[0156] The above are only illustrative examples, and the target number of cycles can be flexibly set according to needs, and may include but is not limited to the above examples.

[0157] In an embodiment of the present application, when the number of cycles of the current baking cycle is the target number of cycles, dry gas is introduced into the furnace cavity. While improving the volatilization efficiency of water in the battery, the frequency of introducing dry gas into the furnace cavity can be reduced, thereby improving the baking efficiency.

[0158] Figure 7 FIG. 1 is a flow chart of a battery baking method provided by some embodiments of the present application. Figure 7 As shown, the method may include steps 71 to 77.

[0159] Step 71: preheat the battery.

[0160] In some embodiments, before the first baking cycle begins, the battery in the oven cavity may be preheated. For example, the controller may first start the heating element to heat the oven cavity, and when the temperature in the oven cavity is heated to a preset temperature and maintained for a period of time, it is determined that the preheating is completed, and the first baking cycle begins, and the battery is officially started to be baked.

[0161] like Figure 1 As shown, after the battery 18 is placed in the vacuum furnace 11, the controller 12 can first start the heating element at the bottom of the tray 17 to heat the furnace cavity. Heating the furnace cavity means heating the battery 18 in the furnace cavity. At the same time, the controller 12 can obtain the temperature in the furnace cavity in real time through the temperature sensor 15. When the obtained temperature is greater than or equal to the preset temperature, it is determined that the temperature in the furnace cavity is heated to the preset temperature, and then the timing is started. When the timing time reaches the preset heating time, it is determined that the temperature in the furnace cavity is stable at the preset temperature.

[0162] After determining that the temperature in the oven cavity is stable at a preset temperature, the controller 12 can control the vacuum valve 14 to open and control the vacuum pump 13 to start evacuating the oven cavity. During the evacuation process, after detecting that the pressure in the oven cavity rises to a first preset pressure, the vacuum valve 14 is controlled to close and the vacuum pump 13 is controlled to stop, and the first baking cycle begins.

[0163] Among them, since the temperature inside the battery changes slowly, during the preheating process, when the temperature in the oven cavity just rises to the preset temperature, the temperature inside the battery may not have reached the preset temperature. At this time, if the first baking cycle is directly entered for baking, the baking efficiency may be affected.

[0164] In an embodiment of the present application, the battery in the oven cavity is preheated for a period of time before starting the baking cycle, so that the temperature inside the battery can be close to or equal to the temperature inside the oven cavity, thereby improving the volatilization efficiency of the water in the battery and further improving the baking efficiency.

[0165] Step 72: evacuate the pressure in the furnace chamber to a first preset pressure.

[0166] In this embodiment, after the battery in the oven cavity is preheated, the first baking cycle may be started. Before each baking cycle starts, the controller may control the vacuum valve to open and the vacuum pump to start to evacuate the oven cavity.

[0167] At the same time, the pressure in the oven cavity is sampled by the pressure sensor. When a certain pressure value obtained by sampling is less than or equal to the first preset pressure, it is determined that the pressure in the oven cavity is evacuated to below the first preset pressure. At this time, the vacuum valve can be controlled to close and the vacuum pump can be controlled to stop to stop evacuating. At the same time, the pressure value obtained by sampling can be determined as the first pressure value at the beginning of the baking cycle.

[0168] Step 73: Obtain the pressure in the furnace chamber.

[0169] Step 74: Determine whether the pressure in the furnace chamber reaches a second preset pressure.

[0170] In this embodiment, after each baking cycle starts, the controller can continuously sample the pressure in the oven cavity through the pressure sensor and determine whether the sampled pressure value is greater than the second preset pressure. If the sampled pressure value is less than the second preset pressure, it is determined that the current baking cycle has not ended, and the process can return to step 73 and step 74.

[0171] On the contrary, when the pressure value obtained by a certain sampling is greater than or equal to the second preset pressure, it is determined that the pressure in the oven cavity rises above the second preset pressure, the current baking cycle is determined to be over, and step 75 is executed. At the same time, the pressure value obtained by sampling is determined as the second pressure value at the end of the baking cycle.

[0172] Step 75: Obtain the pressure change rate in the furnace chamber.

[0173] Step 76: Determine whether the pressure change rate is greater than a preset change rate.

[0174] In this embodiment, after determining that the current baking cycle is over, the controller can calculate and determine the pressure change rate of the current baking cycle in the oven cavity according to the acquired first pressure value and second pressure value. When the pressure change rate is greater than the preset change rate, it is determined that the water content of the battery placed in the oven cavity is higher than the specified value, and the water content of the battery does not meet the requirement. At this time, it can be determined that the battery baking is not completed, and the process can return to step 72 to start the next adjacent baking cycle.

[0175] On the contrary, when the pressure change rate is less than or equal to the preset change rate, it is determined that the water content of the battery meets the requirement, and step 77 is executed.

[0176] Step 77: Determine whether the water content of the battery meets the requirement.

[0177] After determining that the water content of the battery reaches the requirement, the baking may be terminated, or the battery may be stopped after continuing to bake the battery for a period of time.

[0178] Figure 8 FIG. 1 is a schematic diagram showing the structure of a battery baking device provided in an embodiment of the present application. Figure 8 As shown, the detection device 80 includes an acquisition module 81 and a determination module 82 .

[0179] An acquisition module 81 is used to acquire multiple pressure values ​​at different times in the oven cavity during the battery baking process;

[0180] The determination module 82 is used to determine whether the water content of the battery meets the requirement according to the multiple pressure values, so as to stop baking the battery.

[0181] In some embodiments, the determination module 82 is specifically used to determine the pressure change rate in the furnace cavity according to a plurality of pressure values; and determine whether the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity.

[0182] In some embodiments, the pressure change rate in the oven cavity includes the pressure change rate in the current baking cycle in the oven cavity. The determination module 82 is specifically used to determine that the water content of the battery meets the requirements when the pressure change rate in the current baking cycle is less than or equal to the preset change rate.

[0183] In some embodiments, the pressure change rate in the oven cavity includes the pressure change rate of multiple consecutive baking cycles in the oven cavity. The determination module 82 is specifically used to determine that the water content of the battery meets the requirements when the pressure change rate of multiple consecutive baking cycles is less than or equal to a preset rate.

[0184] In some embodiments, the plurality of pressure values ​​includes a first pressure value at the beginning of the toasting cycle and a second pressure value at the end of the toasting cycle.

[0185] In some embodiments, the acquisition module 81 is also used to determine that the baking cycle is over if it is detected that the pressure in the oven cavity reaches a preset pressure during each baking cycle, and determine the detected pressure value as the second pressure value at the end of the baking cycle.

[0186] In some embodiments, the device 80 further includes: an introduction module for introducing dry gas into the furnace chamber at regular intervals.

[0187] In some embodiments, the introduction module is specifically used to introduce dry gas into the oven cavity once before each baking cycle starts.

[0188] In some embodiments, the introduction module is specifically used to introduce a primary drying gas into the oven cavity when the number of cycles of the current baking cycle reaches the target number of cycles.

[0189] Fig. 9 FIG. 1 shows a structural block diagram of a battery baking device provided in an embodiment of the present application. Fig. 9 As shown, the battery baking device 9 includes a processor 91 and a memory 92 , and the above-mentioned components can be connected via one or more buses 94 .

[0190] The battery baking device 9 further includes a computer program 93, which is stored in the memory 92. When the computer program 93 is executed by the processor 91, the battery baking device 9 performs the above Figure 2 and Figure 7 All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding physical device, and will not be repeated here.

[0191] An embodiment of the present application also provides a readable storage medium, which includes a computer program. When the computer program is executed on a computer, the computer executes the method provided by the above method embodiment.

[0192] An embodiment of the present application also provides a computer program product comprising instructions, and when the computer program product is run on a computer, the computer is enabled to execute the method provided by the above method embodiment.

[0193] An embodiment of the present application also provides a chip system, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a battery baking device equipped with the chip system executes the method provided in the above method embodiment.

[0194] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0195] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0196] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0197] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0198] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0199] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0200] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0201] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0202] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0203] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery baking method, characterized in that: include: During the battery baking process, multiple pressure values ​​at different times in the furnace chamber are obtained; It is determined according to the multiple pressure values ​​that the water content of the battery meets the requirement, so as to stop baking the battery.

2. The method according to claim 1, characterized in that The determining, according to the multiple pressure values, that the water content of the battery meets the requirement includes: determining a rate of change of pressure in the furnace chamber according to the plurality of pressure values; The water content of the battery is determined to meet the requirement according to the pressure change rate in the furnace chamber.

3. The method according to claim 2, characterized in that The pressure change rate in the oven cavity includes the pressure change rate in the oven cavity during the current baking cycle, and determining that the water content of the battery meets the requirement according to the pressure change rate in the oven cavity includes: When the pressure change rate of the current baking cycle is less than or equal to the preset change rate, it is determined that the water content of the battery meets the requirement.

4. The method according to claim 2, characterized in that The pressure change rate in the furnace cavity includes the pressure change rate in the furnace cavity for a plurality of consecutive baking cycles, and determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity includes: When the pressure change rate of the plurality of consecutive baking cycles is less than or equal to a preset rate, it is determined that the water content of the battery meets the requirement.

5. The method according to claim 3 or 4, characterized in that The plurality of pressure values ​​include a first pressure value at the beginning of a toasting cycle and a second pressure value at the end of the toasting cycle.

6. The method according to claim 5, characterized in that The method further comprises: In each baking cycle, if it is detected that the pressure in the oven cavity reaches a preset pressure, it is determined that the baking cycle is ended, and the detected pressure value is determined as a second pressure value at the end of the baking cycle.

7. The method according to any one of claims 1 to 6, characterized in that The method further comprises: introducing drying gas into the furnace chamber once at regular intervals.

8. The method according to claim 7, characterized in that The step of introducing dry gas into the furnace chamber at regular intervals comprises: Before each baking cycle begins, dry gas is introduced into the oven chamber.

9. The method according to claim 7, characterized in that The step of introducing dry gas into the furnace chamber at regular intervals comprises: When the number of cycles of the current baking cycle reaches the target number of cycles, primary drying gas is introduced into the oven cavity.

10. A battery baking device, characterized in that: include: An acquisition module is used to acquire multiple pressure values ​​in the furnace chamber at different times during the battery baking process; The determination module is used to determine whether the water content of the battery meets the requirement according to the multiple pressure values, so as to stop baking the battery.

11. A readable storage medium, characterized in that: The readable storage medium stores a computer program, and when the computer program is executed on the battery baking device, the battery baking device is enabled to execute the method according to any one of claims 1 to 9.

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