Battery baking method and apparatus, and readable storage medium

Abstract

The present application relates to the technical field of batteries. Provided are a battery baking method and apparatus, and a readable storage medium. The method comprises: during a battery baking process, acquiring a plurality of pressure values in a furnace cavity at different moments; and on the basis of the plurality of pressure values, determining whether the water content of a battery meets a requirement, so as to stop baking the battery. A plurality of pressure values in a furnace cavity at different moments are acquired during a battery baking process, and on the basis of the plurality of pressure values, pressure changes in the furnace cavity can be determined, such that on the basis of the pressure changes in the furnace cavity, whether the water content of a battery all meets a requirement can be determined. When the water content of the battery meets the requirement, baking can be stopped in a timely manner, thereby shortening baking time, and therefore baking efficiency can be improved.

Description

Battery baking method, device and readable storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 31, 2023, with application number 202310952776.2 and invention name “Battery Baking Method, Device and Readable Storage Medium”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] The water content of batteries significantly impacts their initial capacity, cycle performance, and internal resistance. Therefore, during battery manufacturing, it's necessary to reduce the water content through baking. During baking, the batteries are placed in a vacuum furnace chamber for baking, and the chamber is repeatedly evacuated to fully evaporate the water in the battery under vacuum conditions, thereby reducing the water content.

[0004] During the battery baking process, it's difficult to accurately measure the water content of the battery, making it difficult to determine whether the water content meets the required requirements. To prevent excessive water content, a longer baking time is often used to allow the water in the battery to fully evaporate after a long baking period. While this method can reduce the risk of excessive water content, it fails to stop baking immediately when the water content reaches the required level, resulting in longer baking times and lower baking efficiency.

[0005] Application Contents

[0006] 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. Technical Solutions

[0007] The technical solution adopted in the embodiment of this application is:

[0008] In a first aspect, a battery baking method is provided, the method comprising:

[0009] During the battery baking process, multiple pressure values ​​in the furnace chamber at different times are obtained;

[0010] 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.

[0011] In some embodiments, determining whether the water content of the battery meets the requirement according to the multiple pressure values ​​includes:

[0012] determining a rate of change of pressure in the furnace cavity based on the plurality of pressure values;

[0013] The water content of the battery is determined to meet the requirement based on the pressure change rate in the furnace chamber.

[0014] 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, and determining whether 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 in the current baking cycle is less than or equal to a preset change rate, determining that the water content of the battery meets the requirement.

[0015] In some embodiments, the method further includes: determining that the water content of the battery does not meet the requirement when the pressure change rate of the current baking cycle is greater than a preset change rate.

[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 whether 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 of the multiple consecutive baking cycles is less than or equal to a preset rate.

[0017] In some embodiments, the method further includes: determining that the water content of the battery does not meet the requirement when the pressure change rate of the multiple consecutive baking cycles is greater than a preset rate.

[0018] 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.

[0019] In some embodiments, determining the pressure change rate in the furnace cavity according to the multiple pressure values ​​includes:

[0020] calculating a pressure difference between the first pressure value and the second pressure value;

[0021] Calculating a time difference between a sampling moment of the first pressure value and a sampling moment of the second pressure value;

[0022] The ratio between the pressure difference and the time difference is calculated and determined as the pressure change rate in the furnace chamber.

[0023] 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.

[0024] In some embodiments, determining whether the water content of the battery meets the requirement according to the multiple pressure values ​​includes:

[0025] The multiple pressure values ​​are input into a pre-trained neural network model, so that the neural network model determines that the water content of the battery meets the requirement based on the multiple pressure values.

[0026] In some embodiments, the method further comprises: introducing drying gas into the furnace chamber at regular intervals.

[0027] In some embodiments, the introducing dry gas into the oven cavity once at regular intervals includes: introducing dry gas into the oven cavity once before each baking cycle begins.

[0028] In some embodiments, the 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 the current baking cycle reaches a target number of cycles.

[0029] In a second aspect, a battery baking device is provided, the device comprising:

[0030] An acquisition module is used to obtain multiple pressure values ​​in the furnace chamber at different times during the battery baking process;

[0031] A determination module is configured to determine, based on the multiple pressure values, whether the water content of the battery meets a requirement, so as to stop baking the battery.

[0032] In some embodiments, the determination module is specifically configured to determine a 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.

[0033] 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, 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 the preset change rate.

[0034] 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 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.

[0035] 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.

[0036] In some embodiments, the acquisition module is further configured 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.

[0037] In some embodiments, the device further comprises: an introduction module for introducing dry gas into the furnace chamber once at regular intervals.

[0038] In some embodiments, the introduction module is specifically configured to introduce dry gas into the oven cavity once before each baking cycle begins.

[0039] In some embodiments, the introduction module is specifically configured to introduce primary drying gas into the oven cavity when the number of cycles of the current baking cycle reaches a target number of cycles.

[0040] In a third aspect, a readable storage medium is provided, on which a computer program is stored. When the computer program is run on a battery baking device, the battery baking device executes the battery baking method provided in the first aspect.

[0041] 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.

[0042] In a fifth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a battery baking device, enables the battery baking device to execute the battery baking method provided in the first aspect.

[0043] In a sixth aspect, a chip is provided, comprising: a processor configured to call and run a computer program from a memory, so that a battery baking device equipped with the chip executes the battery baking method provided in the first aspect. Beneficial effects

[0044] The first aspect of the present invention provides a beneficial effect of obtaining multiple pressure values ​​at different times within the oven cavity during the battery baking process. Based on these multiple pressure values, the pressure change within the oven cavity can be determined. Therefore, based on the pressure change within the oven cavity, it can be determined whether the water content of the batteries has met the requirements. Baking of the batteries can be stopped when it is determined that the water content has met the requirements. In this way, baking can be stopped promptly when the water content of the batteries has met the requirements, shortening the baking time and thereby improving baking efficiency.

[0045] Furthermore, during the baking process, there is no need to test the water content of the battery using a test cell, which simplifies the baking process and can further improve baking efficiency. At the same time, the shortened baking time can also reduce the energy consumed during the baking process, thereby reducing baking costs.

[0046] 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

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] FIG1 shows a schematic diagram of the composition of a baking system provided in some examples of the present application.

[0049] FIG2 shows a flowchart of the steps of a battery baking method provided in some embodiments of the present application.

[0050] FIG3 is a schematic diagram showing a pressure change rate during a baking process provided in some examples of the present application.

[0051] FIG4 shows a schematic diagram of a control flow in a baking process provided by some embodiments of the present application.

[0052] FIG5 shows a schematic diagram of the composition of another baking system provided in some examples of the present application.

[0053] FIG6 is a schematic diagram showing pressure changes in a furnace cavity during a baking process provided in some examples of the present application.

[0054] FIG7 shows a schematic flow chart of a battery baking method provided in some embodiments of the present application.

[0055] FIG8 shows a schematic structural diagram of a battery baking device provided in an embodiment of the present application.

[0056] FIG9 shows a structural block diagram of a battery baking device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0057] The technical solutions of this application will be described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them.

[0058] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may 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 avoid obscuring the description of the present application with unnecessary detail.

[0059] 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 collections thereof. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. In the following, 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 technical features indicated. 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, "multiple" means two or more.

[0060] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0061] Batteries are also called battery cells or battery cells (hereinafter referred to as batteries). The water content of batteries has a significant impact on the battery's initial capacity, 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, consuming lithium ions and shortening the battery's discharge time, thereby reducing the battery's initial capacity. At the same time, excess water will react with the lithium salt to produce precipitates, which will cover the surface of the electrode, hindering the entry and exit of lithium ions, causing the battery's cycle performance to deteriorate and increasing the internal resistance.

[0062] 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.

[0063] 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 test battery are usually placed in the furnace chamber of a vacuum furnace at the same time. The test battery is usually a defective product in the manufacturing process.

[0064] During the baking process, the sealed oven chamber is evacuated cyclically. Each vacuuming step corresponds to the start of a baking cycle, and the time between two vacuuming steps is a baking cycle. That is, the oven chamber is evacuated once before each baking cycle, and the time when vacuuming ends is the start of the baking cycle. During the baking cycle, the moisture in the battery continuously evaporates under vacuum.

[0065] After each baking cycle, the oven cavity is vacuumed again and the next baking cycle begins. After baking through multiple baking cycles, the experimental battery in the oven cavity is removed and the water content of the experimental battery is measured.

[0066] When the water content of the test battery is greater than the specified value, it is determined that the water content of the battery does not meet the requirements, and the test battery is placed in the oven cavity and the battery is continued to be baked. When the water content of the test battery is less than or equal to the specified value, it is determined that the water content of the battery meets the requirements.

[0067] 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 under the same baking conditions, when the water content of the experimental battery meets the requirement, there is a certain probability that the water content of the battery to be baked will not meet the requirement. To avoid the situation where the water content of the experimental battery meets the requirement, it will continue to be baked for a period of time after the water content of the experimental battery is determined to meet the requirement to allow the water in the battery to fully evaporate, thereby reducing the probability of the battery having excessive water content.

[0068] While the above method can reduce the probability of excessive water content, the inaccurate water content measurement makes it difficult to stop baking when the battery's water content reaches the required level. This requires a prolonged baking time, resulting in low baking efficiency. Furthermore, when measuring water content using a test cell, it may be necessary to remove the test cell from the oven chamber multiple times during the baking process to measure the water content. This is a cumbersome operation and further reduces baking efficiency. Furthermore, as the baking time increases, more energy is consumed during the baking process, increasing baking costs.

[0069] 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.

[0070] During the battery baking process, the water volatilized from the battery enters the vacuum chamber, causing the pressure inside the chamber to change. The greater the water content in the battery, the more water volatilizes, and the more water volatilizes, the greater the pressure change inside the chamber. Therefore, the change in chamber pressure can be used to determine the amount of water volatilized from the battery and, therefore, whether the battery's water content meets the required level.

[0071] In the embodiment of the present application, multiple pressure values ​​at different times within the oven cavity are obtained during the battery baking process. Pressure changes within the oven cavity can be determined based on these multiple pressure values. Consequently, it can be determined based on the pressure changes within the oven cavity whether the water content of the batteries has met the required level. Baking of the batteries can be stopped when it is determined that the water content has met the required level. In this way, baking can be stopped promptly when the water content of the batteries has met the required level, shortening the baking time and thereby improving baking efficiency.

[0072] Furthermore, during the baking process, there is no need to test the water content of the battery using a test cell, which simplifies the baking process and can further improve baking efficiency. At the same time, the shortened baking time can also reduce the energy consumed during the baking process, thereby reducing baking costs.

[0073] Figure 1 shows a schematic diagram of a baking system provided in some examples of this application. As shown in Figure 1, 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, and a vacuum system.

[0074] The host computer 20 can be a device with control functions such as a computer, a touch screen, an industrial computer, etc. The host computer 20 is in communication with the controller 12 and can send instructions to the controller 12 to enable the controller 12 to control the operation of the baking device 10.

[0075] 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 during the baking process from the host computer 20 to control the operation of the entire baking device 10.

[0076] A tray 17, such as an aluminum plate, is placed within the chamber of the vacuum furnace 11 to hold batteries 18. A heating element (not shown) is located at the bottom of the tray 17. The heating element may be a heating film or heating tube. The heating element is connected to the controller 12, which can start or stop the heating element.

[0077] 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 via a vacuum pipe 19, and the vacuum valve 14 is mounted on the vacuum pipe 19. A controller 12 is connected to the vacuum pump 13 and the vacuum valve 14 to control the start and stop of the vacuum pump 13 and the opening and 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.

[0078] 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 disposed within the furnace chamber of the vacuum furnace 11 and can sample the temperature within the furnace chamber. The pressure sensor 16 is, for example, a vacuum gauge. The vacuum gauge is connected to the furnace chamber and can sample the pressure within the furnace chamber (pressure is also called the vacuum value). 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.

[0079] During the battery baking process, batteries 18 are first placed on tray 17 and the chamber of vacuum furnace 11 is sealed. Controller 12 then activates the heating element to heat the chamber, heating the chamber and, consequently, the batteries 18 within. Before each baking cycle begins, controller 12 opens vacuum valve 14 and starts vacuum pump 13, evacuating the chamber of vacuum furnace 11. Controller 12 then closes vacuum valve 14 and stops vacuum pump 13, beginning a new baking cycle and baking the batteries 18 under vacuum.

[0080] After each baking cycle is completed, 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 to start the next adjacent baking cycle.

[0081] It should be noted that FIG1 is only an illustrative example, and the composition of the baking system may include but is not limited to the above example.

[0082] FIG2 shows a flowchart of a method for baking a battery according to some embodiments of the present application. The method can be implemented by the controller 12 shown in FIG1 and can include steps 21 and 22.

[0083] Step 21: During the battery baking process, obtain multiple pressure values ​​in the furnace chamber at different times.

[0084] In some embodiments, before starting to bake the battery cells, the controller can activate the heating element in the furnace cavity. The heating element continues to operate during each baking cycle to heat the batteries placed in the furnace cavity. Before each baking cycle begins, the controller can open the vacuum valve and start the vacuum pump to evacuate the furnace cavity of the vacuum furnace, placing the furnace cavity in a vacuum state. During the baking cycle, the batteries are heated in a vacuum environment, and the moisture in the batteries 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.

[0085] As shown in FIG1 , during the baking process, the controller 12 can sample the pressure in the oven cavity at different sampling times via the pressure sensor 16 to obtain multiple pressure values ​​at different times in the oven cavity. For example, during the baking process, the controller 12 can sample a pressure value in the oven cavity via the pressure sensor 16 at regular intervals to obtain multiple pressure values ​​at different times in the oven cavity.

[0086] For another example, the controller 12 may sample the pressure value within the oven cavity at different sampling times via the pressure sensor 16 after each baking cycle begins, thereby obtaining multiple pressure values ​​within the oven cavity at different times. Alternatively, the controller 12 may continuously sample the pressure within the oven cavity at different sampling times via the pressure sensor 16 within a period of time before the end of each baking cycle, with a predetermined time interval between two adjacent sampling times. This allows the controller 12 to obtain multiple pressure values ​​within the oven cavity at different times within a period of time before the end of the baking cycle.

[0087] 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.

[0088] Step 22: Determine, based on the multiple pressure values, whether the water content of the battery meets the requirement, and stop baking the battery.

[0089] For example, if the multiple pressure values ​​obtained include multiple pressure values ​​within a period before the end of a baking cycle, the controller can determine whether the multiple pressure values ​​within the period before the end of the baking cycle are greater than a preset pressure value. If the multiple pressure values ​​are all greater than the preset pressure value, it can be determined that a large amount of water has evaporated from the battery into the oven cavity, and thus it can be determined that the battery contains a large amount of water and the water content of the battery does not meet the requirement. Conversely, if the multiple pressure values ​​are all less than or equal to the preset pressure value, it can be determined that a small amount of water has evaporated from the battery into the oven cavity, and thus it can be determined that the water content of the battery meets the requirement.

[0090] For example, if the multiple pressure values ​​obtained at different times include multiple pressure values ​​within a baking cycle, a 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 requirements based on the slope of the pressure change curve, or the water content of the battery can be determined to not meet the requirements based on the slope of the pressure change curve.

[0091] For example, 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.

[0092] The above examples are merely illustrative. Specific methods for determining whether the water content of a battery meets the requirements based on multiple pressure values ​​may include but are not limited to the above examples.

[0093] In some embodiments, after determining that the battery water content meets the requirement, the battery baking process can be stopped directly. For example, after determining that the battery water content meets the requirement, the controller can control the heating element to stop operating, 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 complete.

[0094] In other embodiments, after determining that the water content of the battery has met the requirement, the battery baking process may be stopped after a period of time. For example, after determining that the water content of the battery has met the requirement, the controller may continue to control the operation of the heating element for a period of time, and continue to cyclically control the opening of the vacuum valve and the start of the vacuum pump to evacuate the oven chamber, and then stop baking the battery after several baking cycles.

[0095] 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.

[0096] It should be noted that the above method can be implemented by the controller 12 shown in Figure 1, or by the host computer 20. When implemented by the host computer 20, the host computer 20 can send control instructions to the controller 12. After receiving the control instructions, 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.

[0097] In the embodiment of the present application, multiple pressure values ​​at different times within the oven cavity are obtained during the battery baking process. Pressure changes within the oven cavity can be determined based on these multiple pressure values. Consequently, it can be determined based on the pressure changes within the oven cavity whether the water content of the batteries has met the required level. Baking of the batteries can be stopped when it is determined that the water content has met the required level. In this way, baking can be stopped promptly when the water content of the batteries has met the required level, shortening the baking time and thereby improving baking efficiency.

[0098] Furthermore, during the baking process, there is no need to test the water content of the battery using a test cell, which simplifies the baking process and can further improve baking efficiency. At the same time, the shortened baking time can also reduce the energy consumed during the baking process, thereby reducing baking costs.

[0099] Optionally, step 22 may include:

[0100] determining a rate of change of pressure within the furnace chamber based on the plurality of pressure values;

[0101] The water content of the battery meets the requirements based on the pressure change rate in the furnace chamber.

[0102] For example, if the multiple pressure values ​​obtained include pressure values ​​within different baking cycles, the rate of change of pressure within the oven cavity during the baking process can be calculated based on the multiple pressure values. For example, if two pressure values ​​are obtained at different times, each within a different 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 calculated ratio is used as the rate of change of pressure within the oven cavity during the baking process.

[0103] For another example, if multiple pressure values ​​are obtained at different times, and the number of pressure values ​​is greater than two, the pressure difference between two adjacent pressure values ​​at the sampling time can be calculated, and the time difference between the sampling times of the two pressure values ​​can be calculated. The ratio of the pressure difference to the time difference can be calculated to obtain a pressure change rate, thereby obtaining multiple pressure change rates. After obtaining the multiple pressure change rates, the average of the multiple pressure change rates is calculated and determined as the pressure change rate in the oven cavity during the baking process.

[0104] For example, if multiple pressure values ​​are obtained at different times, the pressure difference between the earliest and latest pressure values ​​can be determined, and the time difference between the two pressure values ​​can be calculated. The ratio of the pressure difference to the time difference can then be calculated to determine the rate of change of pressure in the oven cavity during the baking process.

[0105] In some embodiments, after obtaining the pressure change rate within the oven cavity during baking, the pressure change rate can be compared with a preset change rate. If 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 battery water content meets the requirement. Conversely, if the pressure change rate is greater than the preset change rate, it is determined that the battery water content does not meet the requirement.

[0106] During the battery baking process, the water volatilized from the battery enters the vacuum chamber, causing the pressure inside the chamber to increase. The more water volatilized, the greater the rate of pressure change. When the rate of pressure change in the chamber drops below a preset rate, it indicates that the battery's water content is low and has fallen below the specified value, meeting the required water content.

[0107] Figure 3 shows a schematic diagram of the pressure change rate during a baking process provided in some examples of this application. In Figure 3, the horizontal axis represents time in minutes (min), the vertical axis represents the pressure change rate in Pascals per minute (Pa / min), and curve 31 represents the pressure change rate within the oven cavity.

[0108] As shown in FIG3 , during the entire baking process, the pressure change rate in the oven chamber gradually decreases. 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 met the requirement, and the battery baking can be stopped.

[0109] 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 requirements. 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 requirements.

[0110] Optionally, the determined pressure change rate in the oven cavity includes the pressure change rate in the current baking cycle in the oven cavity, and the step of determining whether the water content of the battery meets the requirements based on the pressure change rate in the oven cavity may include: when the pressure change rate in the current baking cycle is less than or equal to the preset change rate, determining that the water content of the battery meets the requirements.

[0111] In some embodiments, the multiple pressure values ​​obtained may include multiple pressure values ​​at different times within the current baking cycle. The pressure change rate within the oven cavity during the current baking cycle can be determined based on the multiple pressure values ​​at different times within the current baking cycle, and whether the water content of the battery meets the requirement can be determined based on the pressure change rate during 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 during the baking process.

[0112] For example, if the multiple pressure values ​​obtained include two pressure values ​​at different times during 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.

[0113] For another example, if the multiple pressure values ​​obtained include multiple pressure values ​​at different times within the current baking cycle, and the number of pressure values ​​is greater than two, the pressure difference between two adjacent pressure values ​​at the sampling time can be calculated, and the time difference between the sampling times of the two pressure values ​​can be calculated. The ratio of the pressure difference to the time difference can be calculated to obtain a pressure change rate, thereby obtaining multiple pressure change rates. After obtaining the multiple pressure change rates, the average of the multiple pressure change rates is calculated and determined as the pressure change rate of the current baking cycle in the oven cavity.

[0114] For another example, if the multiple pressure values ​​obtained include pressure values ​​at different times during the current baking cycle, the pressure difference between the earliest sampled value and the latest sampled value can be determined, and the time difference between the sampling times of the two pressure values ​​can be calculated. The ratio of the pressure difference to the time difference can then be calculated to determine the rate of change of pressure in the oven cavity during the current baking cycle.

[0115] After obtaining the pressure change rate in the oven cavity during the current baking cycle, the pressure change rate during the current baking cycle can be compared with a preset pressure change rate. If the pressure change rate during the current baking cycle is less than or equal to the preset pressure change rate, it is determined that the water content in the battery is low, and thus the water content in the battery meets the requirement. Conversely, if the pressure change rate during the current baking cycle is greater than the preset pressure change rate, it is determined that the water content in the battery does not meet the requirement.

[0116] The above examples are merely illustrative. Specific methods for calculating the pressure change rate of the current baking cycle based on multiple pressure values ​​in the current baking cycle may include but are not limited to the above examples.

[0117] 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 requirements. 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 requirements.

[0118] Optionally, the pressure change rate in the oven cavity includes the pressure change rate of multiple consecutive baking cycles in the oven cavity, 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 of multiple consecutive baking cycles is less than or equal to a preset rate.

[0119] 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 based on the pressure values ​​at different times in each baking cycle. When 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.

[0120] 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.

[0121] 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 for the Nth baking cycle can be calculated, the pressure change rate in the oven cavity for the (N+1)th baking cycle can be calculated, the pressure change rate in the oven cavity for the (N+2)th baking cycle can be calculated, and the pressure change rate in the oven cavity for 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.

[0122] 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.

[0123] 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.

[0124] 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 during the baking cycle.

[0125] 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.

[0126] For example, before each baking cycle begins, the pressure within the oven cavity can be evacuated to below a first preset pressure P1. As shown in Figure 1, before each baking cycle begins, the controller 12 controls the vacuum valve 14 to open and the vacuum pump 13 to start, thereby evacuating the oven cavity. After controlling the vacuum pump 13 to start, the controller 12 can sample the pressure within the oven cavity in real time via the pressure sensor 16 to continuously monitor the pressure within the oven cavity.

[0127] If the pressure in the oven cavity obtained from a certain sampling is less than or equal to the first preset pressure P1, the controller 12 determines that the pressure in the oven cavity has dropped below the first preset pressure P1, and can control the vacuum valve 14 to close and the vacuum pump 13 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 sampled pressure value as the first pressure value P3 at the beginning of the baking cycle, or use the pressure sensor 16 to sample the pressure in the oven cavity again to obtain the first pressure value P3 at the beginning of the baking cycle.

[0128] 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, and the vacuum pump 13 is in a stopped state. The moisture in the battery 18 evaporates into the oven cavity under a vacuum state, and the pressure in the oven cavity continues to rise.

[0129] 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. 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. The pressure sensor samples the pressure in the oven cavity, and the sampled pressure value is determined as the second pressure value P4 in the oven cavity at the end of the baking cycle.

[0130] 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 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 oven cavity during the current baking cycle.

[0131] 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 separately based on the first pressure value P3 and the second pressure value P4 in each baking cycle.

[0132] 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.

[0133] In some embodiments, in each baking cycle, if it is detected that the pressure in the oven cavity reaches a preset pressure, the baking cycle is determined to be over, and the detected pressure value is determined as the second pressure value at the end of the baking cycle.

[0134] Figure 4 shows a schematic diagram of a control flow for a baking process provided by some embodiments of the present application. As shown in Figure 4 , before each baking cycle begins, the controller 12 first controls the vacuum valve to open and the vacuum pump to start, evacuating the pressure within the oven cavity to below a first preset pressure P1. It then controls the vacuum valve to close and the vacuum pump to stop. After evacuating the pressure within the oven cavity to below the first preset pressure P1, the controller determines that the baking cycle has begun and begins timing.

[0135] 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 ease of distinction, the preset pressure is referred to as the second preset pressure P2), it can be determined that the baking cycle is over, and the sampled pressure value 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 sampled pressure value 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.

[0136] 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 pressure change rate in the oven cavity during the baking cycle.

[0137] In an 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.

[0138] Optionally, the method may further include: introducing drying gas into the furnace chamber once every period of time.

[0139] Figure 5 shows a schematic diagram of another baking system provided in some examples of this application. As shown in Figure 5, the chamber of a vacuum furnace 11 can be connected to a dry gas source 111 via a gas supply valve 110. Gas supply valve 110 is connected to a controller 12. After the controller 12 controls gas supply valve 110 to open, it can pass dry gas from dry gas source 111 into the chamber of the vacuum furnace 11. The dry gas can be a dry inert gas, such as nitrogen.

[0140] For example, the air replenishment time can be pre-set, for example, for one hour. The controller 12 begins timing after entering the first baking cycle, i.e., after the controller 12 controls the vacuum valve 14 to open for the first time and controls the vacuum pump 13 to start evacuating the pressure in the oven chamber to the first preset pressure P1. After the timing starts, when the timer reaches one hour, the controller 12 controls the air replenishment valve 110 to open for the air replenishment time and then close, introducing a certain amount of dry gas into the oven chamber.

[0141] Then, the controller 12 can reset the timing time and restart the timing. 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 closes. The controller 12 repeats the timing cycle and controls the air supply valve 110 to open when the timing time reaches 1 hour to allow dry gas to flow into the oven chamber until the baking is completed.

[0142] Among them, in the process of introducing dry gas into the furnace cavity at regular intervals, if the timing 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.

[0143] It should be understood that the duration of the inhalation can be 1 hour, 0.5 hours, or 1.5 hours, and the specific value of the inhalation time can include but is not limited to the above examples.

[0144] Among them, the dry gas can be mixed with the moisture in the furnace cavity. During the vacuuming process, the dry gas and 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.

[0145] 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.

[0146] 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.

[0147] As shown in Figure 5, before each baking cycle begins, the controller 12 can first control the air supply valve 110 to open to introduce dry gas into the oven cavity. After the air supply valve 110 is open for a preset air supply time, the controller 12 controls the air supply valve 110 to close 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 the vacuum pump 13 to start evacuating the oven cavity, reducing the pressure in the oven cavity to below a first preset pressure P1. The controller then controls the vacuum valve 14 to close and the vacuum pump 13 to stop, thereby starting a baking cycle.

[0148] 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.

[0149] As shown in Figure 5, the controller 12 determines that the baking cycle has ended when it detects that the pressure in the furnace chamber has reached 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 chamber through the pressure sensor 16. When the pressure in the furnace chamber reaches the third preset pressure, the air supply valve 110 is closed, and the supply of dry gas to the furnace chamber is stopped. The controller 12 then controls the vacuum valve 14 to open and the vacuum pump 13 to start evacuating the furnace chamber, reducing the pressure in the furnace chamber to below the first preset pressure P1, and thus starting the next baking cycle. It should be understood that methods for introducing dry gas into the furnace chamber may include, but are not limited to, the examples described above.

[0150] In an 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.

[0151] In some embodiments, when the number of cycles in the current baking cycle reaches the target number of cycles, a drying gas is introduced into the oven cavity.

[0152] For example, the target cycle number may be an even number. If the controller determines that the current baking cycle number is an even number, it may control the air supply valve to open before the current baking cycle begins, allowing dry gas to flow into the oven cavity. For example, after entering the first baking cycle, if the controller determines that the baking cycle number is an odd number such as 1, 3, 5, 7, etc., after the baking cycle ends, it may determine that the current baking cycle number is an even number. The controller may control the air supply valve to open to allow dry gas to flow into the oven cavity when the current baking cycle number is an even number.

[0153] For example, the controller may introduce dry gas into the oven cavity every preset number of baking cycles, so that dry gas is introduced into the oven cavity when the number of cycles in the current baking cycle reaches the target number. For example, if the preset number is 4, before the start of the first baking cycle, the controller may initialize the preset number of baking cycles to 0, and increment the number of baking cycles by 1 after each baking cycle. Before the start of the current baking cycle, if the controller determines that the number of cycles in the current baking cycle is the target number of cycles, such as 4, 8, 12, 16, etc., the controller first controls the air supply valve to open before the start of the current baking cycle to introduce dry gas into the oven cavity, then controls the vacuum valve to open and starts the vacuum pump to evacuate the oven cavity.

[0154] For example, the target number of cycles can be a preset number of cycles. For example, the target number of cycles can be preset to 4, 6, 11, 16, and 20. Before each baking cycle begins, the controller can count the number of baking cycles. If the number of cycles in the current baking cycle is the target number of cycles, such as 4, 6, 11, 16, and 20, the controller can control the air supply valve to open before the current baking cycle begins to introduce dry gas into the oven cavity, and then control the vacuum valve to open and start the vacuum pump to evacuate the oven cavity.

[0155] Figure 6 shows a schematic diagram of pressure changes in a furnace chamber during a baking process provided in some examples of the present application. In Figure 6, the horizontal axis represents time in minutes, the vertical axis represents pressure in Pa, and curve 61 represents the pressure change curve in the furnace chamber.

[0156] Taking one baking cycle as an example, the baking cycle starts at time T1 and ends at time T2, as shown in Figure 6. Before the baking cycle begins, the controller opens the vacuum valve and starts the vacuum pump. At time T1, the pressure in the oven cavity is evacuated to a first preset pressure P1. The controller then closes the vacuum valve and stops the vacuum pump, and the baking cycle begins. Simultaneously, at time T2, the controller detects that the pressure in the oven cavity has risen to a second preset pressure P2, confirming the end of the baking cycle. During the baking cycle, the pressure in the oven cavity rises from the first preset pressure P1 to the second preset pressure P2.

[0157] Taking another baking cycle as an example, this baking cycle starts at time T3 and ends at time T4, as shown in Figure 6. The number of cycles in this baking cycle is the preset target number. Before the baking cycle begins, the controller first controls the air supply valve to open, introducing dry gas into the oven cavity. The controller then controls the vacuum valve to open and the vacuum pump to start. At time T3, the pressure in the oven cavity is evacuated to the first preset pressure P1, and the baking cycle begins. At time T4, the controller detects that the pressure in the oven cavity has risen to the second preset pressure P2, and the controller determines that the baking cycle has ended.

[0158] Before the baking cycle begins, dry gas is introduced into the oven chamber and then vacuumed. The pressure in the oven chamber first rises to above pressure P5, then is vacuumed to the first preset pressure P1, and then rises from the first preset pressure P1 to the second preset pressure P2.

[0159] As shown in FIG3 , 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.

[0160] The above are merely illustrative examples, and the target number of cycles can be flexibly set according to needs, including but not limited to the above examples.

[0161] In an embodiment of the present application, when the number of cycles in 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.

[0162] FIG7 is a flow chart showing a method for baking a battery according to some embodiments of the present application. As shown in FIG7 , the method may include steps 71 to 77 .

[0163] Step 71: Preheat the battery.

[0164] In some embodiments, the batteries in the oven cavity may be preheated before the first baking cycle begins. For example, the controller may first activate a heating element to heat the oven cavity. When the temperature in the oven cavity reaches a preset temperature and remains constant for a period of time, preheating is determined to be complete, and the first baking cycle begins, officially starting the battery baking process.

[0165] As shown in Figure 1, after batteries 18 are placed in vacuum furnace 11, controller 12 can first activate the heating element at the bottom of tray 17 to heat the furnace cavity. Heating the furnace cavity heats batteries 18 within the furnace cavity. Simultaneously, controller 12 can obtain the temperature within the furnace cavity in real time via temperature sensor 15. If the obtained temperature is greater than or equal to a preset temperature, controller 12 determines that the temperature within the furnace cavity has been heated to the preset temperature, then begins timing. When the timing reaches the preset heating time, controller 12 determines that the temperature within the furnace cavity has stabilized at the preset temperature.

[0166] 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 the vacuum pump 13 to start evacuating the oven cavity. During the evacuation process, after detecting that the pressure in the oven cavity has risen 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.

[0167] 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 yet. At this time, if the first baking cycle is directly entered for baking, the baking efficiency may be affected.

[0168] 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 moisture in the battery and further improving the baking efficiency.

[0169] Step 72: Evacuate the pressure in the furnace chamber to a first preset pressure.

[0170] In this embodiment, after the batteries in the oven cavity are preheated, the first baking cycle can be started. Before each baking cycle starts, the controller can control the vacuum valve to open and the vacuum pump to start to evacuate the oven cavity.

[0171] At the same time, the pressure in the oven cavity is sampled by a pressure sensor. If a certain sampled pressure value is less than or equal to a first preset pressure, it is determined that the pressure in the oven cavity has been 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 the vacuuming. At the same time, the sampled pressure value can be determined as the first pressure value at the beginning of the baking cycle.

[0172] Step 73: Obtain the pressure in the furnace chamber.

[0173] Step 74: Determine whether the pressure in the furnace cavity reaches a second preset pressure.

[0174] In this embodiment, after each baking cycle begins, the controller may continuously sample the pressure within the oven cavity via the pressure sensor and determine whether the sampled pressure value is greater than a 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 may return to steps 73 and 74.

[0175] Conversely, if 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 has risen above the second preset pressure, the current baking cycle is determined to have ended, and step 75 is executed. At the same time, the pressure value obtained by the sampling is determined as the second pressure value at the end of the baking cycle.

[0176] Step 75: Obtain the pressure change rate in the furnace chamber.

[0177] Step 76: Determine whether the pressure change rate is greater than a preset change rate.

[0178] In this embodiment, after determining that the current baking cycle has ended, the controller may calculate the pressure change rate within the oven cavity during the current baking cycle based on the acquired first and second pressure values. If the pressure change rate is greater than a preset pressure change rate, it is determined that the water content of the batteries placed within the oven cavity exceeds a specified value and that the water content of the batteries does not meet the required value. In this case, it can be determined that the battery baking is not complete, and the process may return to step 72 to begin the next adjacent baking cycle.

[0179] 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.

[0180] Step 77: Determine whether the water content of the battery meets the requirement.

[0181] After determining that the water content of the battery meets the requirement, the baking process may be terminated, or the battery may be continued to be baked for a period of time before the baking process is stopped.

[0182] FIG8 shows a schematic diagram of the structure of a battery baking device provided in an embodiment of the present application. As shown in FIG8 , the detection device 80 includes an acquisition module 81 and a determination module 82 .

[0183] An acquisition module 81 is used to acquire multiple pressure values ​​in the oven cavity at different times during the battery baking process;

[0184] The determination module 82 is configured to determine, based on the multiple pressure values, whether the water content of the battery has reached a requirement, so as to stop baking the battery.

[0185] In some embodiments, the determination module 82 is specifically configured to determine a 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] In some embodiments, the acquisition module 81 is further configured 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.

[0190] In some embodiments, the device 80 further includes: an introduction module for introducing drying gas into the furnace chamber once every period of time.

[0191] In some embodiments, the introduction module is specifically configured to introduce dry gas into the oven cavity once before each baking cycle begins.

[0192] In some embodiments, the introduction module is specifically configured to introduce primary drying gas into the oven cavity when the number of cycles in the current baking cycle reaches a target number of cycles.

[0193] FIG9 shows a block diagram of a battery baking device according to an embodiment of the present invention. As shown in FIG9 , the battery baking device 9 includes a processor 91 and a memory 92 , and the aforementioned components can be connected via one or more buses 94 .

[0194] The battery baking device 9 also 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 method shown in Figures 2 and 7. All relevant contents of each step involved in the above method embodiment can be referred to in the functional description of the corresponding physical device and will not be repeated here.

[0195] An embodiment of the present application further provides a readable storage medium, which includes a computer program. When the computer program is run on a computer, the computer executes the method provided in the above method embodiment.

[0196] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method provided in the above method embodiment.

[0197] 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.

[0198] 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.

[0199] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or 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 any conventional processor.

[0200] 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 SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0201] Those skilled 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 beyond the scope of this application.

[0202] Those skilled in the art will 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.

[0203] In the several embodiments provided in this 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 merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, 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.

[0204] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0205] 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.

[0206] 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, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method 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.

[0207] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery baking method, wherein: 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 of claim 1, wherein: 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 of claim 2, wherein: 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 of claim 3, wherein: The method further comprises: 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.

5. The method of claim 2, wherein: 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.

6. The method of claim 5, wherein: The method further comprises: When the pressure change rate of the plurality of consecutive baking cycles is greater than a preset rate, it is determined that the water content of the battery does not meet the requirement.

7. The method according to any one of claims 2 to 6, wherein: 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.

8. The method of claim 6, wherein: Determining the pressure change rate in the furnace chamber according to the multiple pressure values ​​includes: calculating a pressure difference between the first pressure value and the second pressure value; Calculating a time difference between a sampling time of the first pressure value and a sampling time of the second pressure value; The ratio between the pressure difference and the time difference is calculated and determined as the pressure change rate in the furnace chamber.

9. The method according to claim 7 or 8, wherein: 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.

10. The method of claim 1, wherein: The determining, according to the multiple pressure values, that the water content of the battery meets the requirement includes: The multiple pressure values ​​are input into a pre-trained neural network model, so that the neural network model determines that the water content of the battery meets the requirement according to the multiple pressure values.

11. The method according to any one of claims 1 to 10, wherein: The method further comprises: introducing drying gas into the furnace chamber once at regular intervals.

12. The method of claim 11, wherein: 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.

13. The method of claim 11, wherein: 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.

14. A battery baking device, wherein: include: An acquisition module is used to obtain 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.

15. A readable storage medium, wherein: 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 13.

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