Battery baking method, device, and readable storage medium

Abstract

The application provides a battery baking method, device and readable storage medium, and relates to the technical field of batteries. The method comprises the following steps: in a battery baking process, a plurality of pressure values at different moments in a furnace cavity are acquired, and the water content of the battery is determined to meet a requirement according to the plurality of pressure values, so that the baking of the battery is stopped. In the battery baking process, the plurality of pressure values at different moments in the furnace cavity are acquired, the pressure change in the furnace cavity can be determined according to the plurality of pressure values, and then whether the water content of the battery meets the requirement can be determined according to the pressure change in the furnace cavity. When the water content of the battery meets the requirement, the baking can be stopped in time, the baking time is shortened, and then the baking efficiency can be improved.

Description

TECHNICAL FIELD

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

[0002] The water content of a battery has an important influence on the capacity, initial efficiency, cycle performance and internal resistance of the battery. Therefore, in the manufacturing process of the battery, the water content of the battery needs to be reduced through baking. In the baking process, the battery is placed in a furnace cavity of a vacuum furnace for baking, and the furnace cavity is repeatedly evacuated to make the water in the battery fully volatilize in a vacuum state, so as to reduce the water content of the battery.

[0003] In the battery baking process, it is difficult to accurately determine the water content of the battery, so it is difficult to determine whether the water content of the battery meets the requirements. In order to avoid the situation that the water content exceeds the standard, a relatively long baking time is usually set, so that the water in the battery fully volatilizes after a long time of baking. Although this method can reduce the situation that the water content exceeds the standard, it cannot stop baking in time when the water content meets the requirements, resulting in a long baking time and low baking efficiency. SUMMARY

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

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

[0006] In the battery baking process, a plurality of pressure values at different times in the furnace cavity are obtained;

[0007] The water content of the battery is determined to meet the requirements according to the plurality of pressure values, so as to stop baking the battery.

[0008] In the embodiments of the present application, a plurality of pressure values at different times in the furnace cavity are obtained in the battery baking process. According to the plurality of pressure values, the pressure change in the furnace cavity can be determined, so that whether the water content of the battery meets the requirements can be determined according to the pressure change in the furnace cavity, and the baking of the battery is stopped when the water content meets the requirements. In this way, the baking can be stopped in time when the water content of the battery meets the requirements, the baking time is shortened, and the baking efficiency can be improved.

[0009] Moreover, the water content of the battery does not need to be determined by experimental batteries in the baking process, 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 in the baking process, thereby reducing the baking cost.

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

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

[0012] determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity.

[0013] In the embodiments of the present application, the pressure change rate in the furnace cavity is detected during the baking process. The determination of the pressure change rate in the furnace cavity can indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the 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 furnace cavity comprises a pressure change rate of a current baking period in the furnace cavity. The determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity comprises: determining that the water content of the battery meets the requirement in a case where the pressure change rate of the current baking period is less than or equal to a preset change rate.

[0015] In the embodiments of the present application, the pressure change rate of the current baking period in the furnace cavity is detected during the baking process. The determination of the pressure change rate in the furnace cavity can indirectly determine whether the water content of the battery meets the requirement. Since the pressure change rate can accurately reflect the 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 furnace cavity comprises pressure change rates of a plurality of continuous baking periods in the furnace cavity. The determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity comprises: determining that the water content of the battery meets the requirement in a case where the pressure change rates of the plurality of continuous baking periods are less than or equal to a preset rate.

[0017] In the embodiments of the present application, the pressure change rates of the plurality of continuous baking periods in the furnace cavity are determined during the baking process. The pressure change rates of the plurality of continuous baking periods can be used to more accurately determine the pressure change in the furnace cavity during the baking process, so as to accurately determine the water content in the battery, and further more accurately determine whether the water content in the battery meets the requirement.

[0018] In some embodiments, the plurality of pressure values comprise a first pressure value at the beginning of a baking period and a second pressure value at the end of the baking period.

[0019] In the embodiments of the present application, in the process of acquiring a plurality of pressure values at different moments in the furnace cavity, a first pressure value at the beginning of a baking cycle and a second pressure value at the end of the baking cycle are acquired, and the pressure change rate of the baking cycle is determined according to the first pressure value and the second pressure value, which can reduce the amount of data and improve the detection efficiency.

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

[0021] In the embodiments of the present application, the current baking cycle is determined to end when the pressure in the furnace cavity rises to the preset pressure, which can ensure that the pressure in the furnace cavity 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 dry gas into the furnace cavity every certain period of time.

[0023] In the embodiments of the present application, dry gas is introduced into the furnace cavity every certain period of time, which can periodically introduce dry gas into the furnace cavity to reduce the water content in the furnace cavity, thereby facilitating the evaporation of moisture in the battery into the furnace cavity during the baking process, and improving the baking efficiency of the battery.

[0024] In some embodiments, the dry gas is introduced into the furnace cavity every certain period of time, which comprises: introducing dry gas into the furnace cavity before the start of each baking cycle.

[0025] In the embodiments 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 evaporation of moisture in the battery into the furnace cavity during the baking cycle, and improving the baking efficiency of the battery.

[0026] In some embodiments, the dry gas is introduced into the furnace cavity every certain period of time, which comprises: introducing dry gas into the furnace cavity when the number of cycles of the current baking cycle reaches a target cycle number.

[0027] In the embodiments of the present application, dry gas is introduced into the furnace cavity when the number of cycles of the current baking cycle reaches the target cycle number, which can improve the evaporation efficiency of moisture in the battery while reducing the frequency of introducing dry gas into the furnace cavity, thereby improving the baking efficiency.

[0028] In a second aspect, a battery baking device is provided, which comprises:

[0029] acquire a plurality of pressure values at different time points in the oven cavity during the battery baking process;

[0030] determine that the water content of the battery reaches a requirement to stop baking the battery according to the plurality of pressure values.

[0031] In some embodiments, the determining module is specifically configured to determine a pressure change rate in the oven cavity according to the plurality of pressure values; and determine that the water content of the battery reaches the requirement according to the pressure change rate in the oven cavity.

[0032] In some embodiments, the pressure change rate in the oven cavity includes a pressure change rate of a current baking cycle in the oven cavity, and the determining module is specifically configured to determine that the water content of the battery reaches the requirement in a case where the pressure change rate of the current baking cycle is less than or equal to a preset change rate.

[0033] In some embodiments, the pressure change rate in the oven cavity includes pressure change rates of a plurality of continuous baking cycles in the oven cavity, and the determining module is specifically configured to determine that the water content of the battery reaches the requirement in a case where the pressure change rates of the plurality of continuous baking cycles are 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 a baking cycle and a second pressure value at the end of the baking cycle.

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

[0036] In some embodiments, the apparatus further includes a passing-in module configured to pass dry gas into the oven cavity once every certain period of time.

[0037] In some embodiments, the passing-in module is specifically configured to pass dry gas into the oven cavity once before the beginning of each baking cycle.

[0038] In some embodiments, the passing-in module is specifically configured to pass dry gas into the oven cavity once in a case where the number of periods of a current baking cycle reaches a target number of periods.

[0039] In a third aspect, a readable storage medium is provided, and the readable storage medium has a computer program stored thereon, the computer program, when executed on a battery baking apparatus, causing the battery baking apparatus to perform 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 computer program causes the battery baking device to perform the battery baking method provided in the first aspect.

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

[0042] In a sixth aspect, a chip is provided, comprising: a processor configured to invoke and run a computer program from a memory, so that a battery baking device installed with the chip performs the battery baking method provided in the first aspect.

[0043] It can be understood that the battery baking device provided in the second aspect and the fourth aspect, 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 perform the battery baking method provided in the first aspect, and thus the beneficial effects achieved thereby can refer to the beneficial effects provided in the corresponding method, which will not be described herein again. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A schematic diagram of a baking system is shown.

[0045] Figure 2 A flowchart of steps of a battery baking method is shown.

[0046] Figure 3 A schematic diagram of pressure change rate in a baking process is shown.

[0047] Figure 4 A control flowchart in a baking process is shown.

[0048] Figure 5 A schematic diagram of another baking system is shown.

[0049] Figure 6 A schematic diagram of pressure change in a baking process is shown.

[0050] Figure 7 A flowchart of a battery baking method is shown.

[0051] Figure 8A structural diagram of a battery baking device is shown.

[0052] Figure 9 A structural diagram of a battery baking device is shown. DETAILED DESCRIPTION

[0053] The technical solutions in the present application will be described below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments.

[0054] In the following description, specific details are set forth in connection with the particular systems, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. However, persons skilled in the art will understand that the present application can be practiced without these specific details. In other instances, well-known systems, structures, circuits, and techniques have not been shown in detail in order not to obscure the present application.

[0055] The term "comprising" is intended to indicate, and pass on the meaning of, a "non-exclusive inclusion", and the term "including" is also intended to indicate, and pass on the meaning of, a "non-exclusive inclusion", unless otherwise explicitly specified. The terms "including", "containing", "having" and their variants are meant to be "including but not limited to", unless otherwise explicitly specified. In the following description, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, "a plurality of" means two or more, unless otherwise specified.

[0056] The term "and / or" in the present application is only a description of the association relationship between the associated objects, and means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0057] The battery is also called battery monomer or battery core (hereinafter referred to as battery), and the water content of the battery has an important influence on the capacity, initial efficiency, cycle performance and internal resistance of the battery. Taking lithium battery as an example, when the water content of the battery is large, the excess water will react with lithium salt in the electrolyte, consume lithium ions, shorten the discharge time of the battery, and thus reduce the capacity and initial efficiency of the battery. At the same time, the excess water will react with lithium salt to produce precipitates, which will cover the surface of the pole piece, hinder the entry and exit of lithium ions, and make the cycle performance of the battery worse and the internal resistance larger.

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

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

[0060] During the baking process, the sealed furnace cavity is repeatedly evacuated, and each evacuation corresponds to the start of a baking cycle. That is, the furnace cavity is evacuated once before the start of each baking cycle, and the end time of the evacuation is the start time of the baking cycle. The water in the battery continuously evaporates in the vacuum state during the baking cycle.

[0061] After each baking cycle ends, the furnace cavity is evacuated again to start the next adjacent baking cycle. After baking for a plurality of baking cycles, the experimental battery in the furnace 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 is a certain difference 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 conditions, 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 that the water content exceeds the standard, after the water content of the experimental battery meets the requirements, the battery is continued to be baked for a period of time, so that the water in the battery can be fully evaporated to reduce the probability of the battery exceeding the water content standard.

[0064] Although the above method can reduce the probability of exceeding the water content standard, since the measurement of the water content is not accurate, it is difficult to stop baking in time when the water content of the battery meets the requirements, and the battery needs to be baked for a long time, resulting in low baking efficiency. At the same time, when measuring the water content by the experimental battery, the experimental battery may need to be taken out from the furnace cavity multiple times during the baking process to measure the water content, which is relatively cumbersome, further reducing the baking efficiency. Moreover, when the baking time increases, a large amount of energy needs to be consumed during the baking process, resulting in high baking cost.

[0065] To solve the above problems, the application provides a battery baking method, comprising: obtaining a plurality of pressure values at different time in a furnace cavity during a battery baking process, and determining that the water content of the battery reaches a requirement according to the plurality of pressure values, so as to stop baking the battery.

[0066] In the battery baking process, the water vaporized from the battery enters the furnace cavity in a vacuum state, which changes the pressure in the furnace cavity. The more water vaporized from the battery, the greater the change in the pressure in the furnace cavity. Therefore, the change in the pressure in the furnace cavity can be used to determine the amount of water vaporized from the battery, and thus determine whether the water content of the battery reaches a requirement.

[0067] In the application, the plurality of pressure values at different time in the furnace cavity during the battery baking process are obtained, and the change in the pressure in the furnace cavity can be determined according to the plurality of pressure values. Thus, whether the water content of the battery reaches a requirement can be determined according to the change in the pressure in the furnace cavity, and the baking of the battery is stopped when the water content reaches a requirement. In this way, the baking can be stopped in time when the water content of the battery reaches a requirement, and the baking time is shortened, thereby improving the baking efficiency.

[0068] In addition, the water content of the battery does not need to be determined by an experimental battery during the baking process, which simplifies the baking process and further improves the baking efficiency. At the same time, the shortening of the baking time also reduces the energy consumed during the baking process, thereby reducing the baking cost.

[0069] Figure 1 A composition diagram of a baking system provided by some examples of the application is shown. As shown in the figure, 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, a vacuum pumping system, etc.

[0070] The host computer 20 can be a computer, a touch screen, an industrial computer, etc. The host computer 20 is in communication connection with the controller 12, and can send instructions to the controller 12 to control the controller 12 to control the operation of the baking device 10.

[0071] The controller 12 can be 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, such as an aluminum plate, is arranged in the furnace cavity of the vacuum furnace 11 for placing the battery 18. The bottom of the tray 17 is provided with heating elements (not shown in the figure), such as heating films, heating pipes, etc. The heating elements are connected with the controller 12, which can control the heating elements to start or stop.

[0073] The vacuum system includes a vacuum pump 13 connected with the furnace cavity of the vacuum furnace 11 through a vacuum pipeline 19, and a vacuum valve 14 arranged on the vacuum pipeline 19. The controller 12 is connected with the vacuum pump 13 and the vacuum valve 14, and can control the vacuum pump 13 to start or stop, and control the vacuum valve 14 to open or close. After the vacuum valve 14 is opened and the vacuum pump 13 is started, the vacuum pump 13 can perform vacuumization on the vacuum furnace 11.

[0074] The data sampling device includes a temperature sensor 15, such as a temperature probe, arranged in the furnace cavity of the vacuum furnace 11 to sample the temperature in the furnace cavity, and a pressure sensor 16, such as a vacuum gauge, connected with the furnace cavity to sample the pressure (also referred to as the vacuum value) in the furnace cavity. The controller 12 is connected with 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] In 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 elements to start heating the furnace cavity, that is, heating the battery 18 in the furnace cavity. Before the start of each baking cycle, the controller 12 first controls the vacuum valve 14 to open and controls the vacuum pump 13 to start, and then controls the vacuum valve 14 to close and controls the vacuum pump 13 to stop, so as to start a baking cycle and make the battery 18 bake in a vacuum state.

[0076] After the end of each baking cycle, the controller 12 again controls the vacuum valve 14 to open and controls the vacuum pump 13 to start to perform vacuumization on the furnace cavity of the vacuum furnace 11, so as to start the adjacent next baking cycle.

[0077] It should be noted that, Figure 1 Only for example, the composition of the baking system can include but is not limited to the above examples.

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

[0079] Step 21: During the battery baking process, obtain multiple pressure values ​​at different times inside the oven cavity.

[0080] In some embodiments, before starting the baking process for the battery cells, the controller can activate the heating element within the oven cavity. The heating element operates continuously during each baking cycle to heat the batteries placed within the oven cavity. Before the start of each baking cycle, the controller can open the vacuum valve and activate the vacuum pump to evacuate the oven cavity, creating a vacuum state. During the baking cycle, the batteries are heated in a vacuum environment, and moisture from the batteries continuously evaporates into the oven cavity. After the end of each baking cycle, the controller can reopen the vacuum valve and activate the vacuum pump again to evacuate the oven cavity, thus beginning the next adjacent baking cycle.

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

[0082] For example, after the start of each baking cycle, the controller 12 can sample the pressure value inside the oven cavity at different sampling times using the pressure sensor 16 to obtain multiple pressure values ​​inside the oven cavity at different times. Alternatively, the controller 12 can continuously sample the pressure inside the oven cavity at different sampling times using the pressure sensor 16 during a period of time before the end of each baking cycle, with a certain time interval between two adjacent sampling times, thereby obtaining multiple pressure values ​​inside the oven cavity at different times during a period of time before the end of the baking cycle.

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

[0084] Step 22: Determine the water content of the battery based on multiple pressure values ​​to stop baking the battery.

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

[0086] For example, if the obtained multiple pressure values at different times include multiple pressure values in a baking cycle, a pressure change curve in the furnace chamber can be fitted according to the multiple pressure values in the baking cycle, and it can be determined that the water content of the battery meets the requirement according to the slope of the pressure change curve, or it can be determined that the water content of the battery does not meet the requirement according to the slope of the pressure change curve.

[0087] For example, if the obtained multiple pressure values include pressure values in different baking cycles, the multiple pressure values can be input into a neural network model trained in advance, and the neural network model can determine that the water content of the battery meets the requirement according to the multiple pressure values, or the neural network model can determine that the water content of the battery does not meet the requirement according to the multiple pressure values.

[0088] The above is only an example, and the method for determining that the water content of the battery meets the requirement according to the multiple pressure values can include but is not limited to the above examples.

[0089] In some embodiments, after determining that the water content of the battery meets the requirement, the baking of the battery can be stopped directly. For example, after determining that the water content of the battery meets the requirement, the controller can control the heating member to stop running, stop starting the vacuum pump to vacuum the furnace chamber, and then output notification information to notify the staff that the battery baking is completed.

[0090] In other embodiments, after determining that the water content of the battery meets the requirement, the baking of the battery can be stopped after baking the battery for a period of time. For example, after determining that the water content of the battery meets the requirement, the controller can continue to control the heating member to run for a period of time, and continue to control the vacuum valve to open and control the vacuum pump to start to vacuum the furnace chamber. After continuing to bake the battery for several baking cycles, the baking of the battery is stopped.

[0091] In this way, after determining that the water content of the battery meets the requirement, if the battery is baked for a period of time, the water content of the battery can be further reduced, and thus the probability of the battery having excessive water content can be reduced.

[0092] It should be noted that the above method can be derived from... Figure 1 The controller 12 shown can also be implemented by the host computer 20. When implemented by the host computer 20, the host computer 20 can send control commands to the controller 12. After receiving the control commands, 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 this embodiment, multiple pressure values ​​are acquired at different times within the oven cavity during the battery baking process. Based on these multiple pressure values, pressure changes within the oven cavity can be determined. This allows for the assessment of whether the battery's water content meets the requirements. Baking is stopped when the required water content is reached. This timely cessation of baking when the battery's water content is within the required range shortens the baking time and improves baking efficiency.

[0094] Furthermore, the baking process eliminates the need to measure the water content of the battery through experimental testing, simplifying the process and further improving baking efficiency. Simultaneously, the reduced baking time decreases energy consumption during baking, thereby lowering baking costs.

[0095] Optionally, step 22 may include:

[0096] The rate of pressure change within the furnace cavity is determined based on multiple pressure values;

[0097] The water content of the battery is determined based on the rate of pressure change within the furnace cavity.

[0098] For example, if the acquired pressure values ​​include pressure values ​​from different baking cycles, the rate of pressure change within the oven cavity during baking can be calculated based on these multiple pressure values. For instance, if two pressure values ​​are acquired at different times, and these two pressure values ​​are located in different baking cycles, the pressure difference between the two pressure values ​​can be calculated, along with the time difference between the sampling times of one pressure value and the other. Then, the ratio between the pressure difference and the time difference is calculated, and this calculated ratio is determined as the rate of pressure change within the oven cavity during baking.

[0099] For 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 is then calculated to obtain a pressure change rate, thus obtaining 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 inside the oven cavity during the baking process.

[0100] For example, if multiple pressure values ​​are obtained at different times, the pressure difference between the earliest and latest sampled 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 rate of pressure change in the oven cavity during baking.

[0101] In some embodiments, after obtaining the rate of pressure change within the oven cavity during baking, the rate of pressure change can be compared with a preset rate of change. If the rate of pressure change is less than or equal to the preset rate of change, it is determined that the water content in the battery is below a specified amount, and the water content of the battery meets the requirements. Conversely, if the rate of pressure change is greater than the preset rate of change, it is determined that the water content of the battery does not meet the requirements.

[0102] During the battery baking process, the moisture that evaporates from the battery enters the vacuum chamber, causing the pressure inside the chamber to rise. The more moisture evaporates, the greater the rate of pressure change within the chamber. When the rate of pressure change within the chamber drops below the preset rate, it indicates that the battery's water content is low and has fallen below the specified value, meaning the battery's water content meets the requirements.

[0103] Figure 3 A schematic diagram illustrating the rate of pressure change during a baking process, provided by some examples of this application, is shown. Figure 3 The horizontal axis represents time in minutes (min), and the vertical axis represents the rate of pressure change in Pascals per minute (Pa / min). Curve 31 represents the rate of pressure change inside the furnace cavity.

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

[0105] In this embodiment of the application, the rate of pressure change in the oven cavity is detected during the baking process. By judging the rate of pressure change in the oven cavity, it can be indirectly determined whether the water content of the battery meets the requirements. Since the rate of pressure change can accurately reflect the amount of water in the battery, it can be determined more accurately whether the water content of the battery meets the requirements.

[0106] Optionally, the determined pressure change rate in the furnace cavity comprises a pressure change rate in a current baking cycle in the furnace cavity, and the step of determining whether the water content of the battery reaches the requirement according to the pressure change rate in the furnace cavity can comprise: determining that the water content of the battery reaches the requirement in a case where the pressure change rate in the current baking cycle is less than or equal to the preset change rate.

[0107] In some embodiments, the obtained multiple pressure values can comprise multiple pressure values at different time points in a current baking cycle, the pressure change rate in the current baking cycle in the furnace cavity can be determined according to the multiple pressure values at different time points in the current baking cycle, and whether the water content of the battery reaches the requirement can be determined according to the pressure change rate in the current baking cycle. The current baking cycle is a baking cycle being currently performed, and the current baking cycle can be any baking cycle in the baking process.

[0108] For example, if the obtained multiple pressure values comprise two pressure values at different time points 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 of the pressure values 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 in the current baking cycle in the furnace cavity.

[0109] For another example, if the obtained multiple pressure values comprise multiple pressure values at different time points 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, and the time difference between the sampling time of the two pressure values can be calculated, the ratio between the pressure difference and the time difference is calculated to obtain a pressure change rate, so as 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 in the current baking cycle in the furnace cavity.

[0110] For another example, if the obtained multiple pressure values comprise multiple pressure values at different time points 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 in the multiple pressure values can be determined, and the time difference between the sampling time 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 furnace cavity.

[0111] After obtaining the pressure change rate in the current baking cycle in the furnace cavity, the pressure change rate in the current baking cycle can be compared with the preset change rate, and in a case where the pressure change rate in 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 reaches the requirement. On the contrary, in a case where the pressure change rate in the current baking cycle is greater than the preset change rate, it is determined that the water content of the battery does not reach the requirement.

[0112] The above is only an example, and the method of calculating the pressure change rate of the current baking cycle according to the plurality of pressure values in the current baking cycle can include but is not limited to the above example.

[0113] In the embodiments of the present application, the pressure change rate of the baking cycle in the inner oven cavity is detected during the baking process. The water content of the battery can be indirectly determined by judging the pressure change rate in the oven cavity. Since the pressure change rate can accurately reflect the water content in the battery, the water content of the battery can be more accurately determined by the pressure change rate.

[0114] Optionally, the pressure change rate in the oven cavity includes the pressure change rate of a plurality of consecutive baking cycles in the oven cavity. The step of determining that the water content of the battery meets the requirement according to the pressure change rate in the oven cavity can include: determining that the water content of the battery meets the requirement when the pressure change rates of the plurality of consecutive baking cycles are less than or equal to the preset rate.

[0115] In some embodiments, the plurality of pressure values obtained include pressure values at different times in a plurality of 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, respectively. When the pressure change rates of the plurality of consecutive baking cycles are all less than or equal to the preset change rate, it is determined that the water content of the battery meets the requirement.

[0116] For example, in the process of obtaining a plurality of pressure values, two pressure values at different times or a plurality of pressure values at different times can be obtained in each baking cycle. In the process of calculating the pressure change rate, the pressure change rate of each baking cycle can be calculated according to the pressure values at different times in each baking cycle, respectively.

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

[0118] After the pressure change rate of each baking cycle is calculated, 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 reaches the requirement.

[0119] In the embodiments of the present application, the pressure change rates of the continuous multiple baking cycles in the furnace cavity are determined during the baking process. According to the pressure change rates of the continuous multiple baking cycles, the pressure change in the furnace cavity during the baking process can be more accurately determined, so that the water content in the battery can be accurately determined, and then whether the water content in the battery reaches the requirement can be more accurately determined.

[0120] Optionally, the multiple 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 the pressure change rate of the baking cycle.

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

[0122] For example, before the beginning of each baking cycle, the pressure in the furnace cavity can be vacuumed to below a first preset pressure P1. As shown in FIG. 1, before the beginning of each baking cycle, the controller 12 controls the vacuum valve 14 to open and controls the vacuum pump 13 to start, so as to vacuum the furnace cavity by the vacuum pump 13. After the vacuum pump 13 is started, the controller 12 can sample the pressure in the furnace cavity in real time by the pressure sensor 16, so as to continuously monitor the pressure in the furnace cavity. Figure 1

[0123] In the case that the pressure in the furnace cavity obtained by sampling is less than or equal to the first preset pressure P1, it is determined that the pressure in the furnace cavity drops to below the first preset pressure P1, the controller 12 can control the vacuum valve 14 to close and control the vacuum pump 13 to stop, so as to stop vacuuming the furnace cavity. When the vacuum pump 13 is stopped, a baking cycle starts, at this time, the controller 12 can take the sampled pressure value as the first pressure value P3 at the beginning of the baking cycle, or sample the pressure in the furnace cavity again by 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 continuously operates to heat the battery 18, the vacuum valve 14 is in a closed state, the vacuum pump 13 is in a stopped state, and the moisture in the battery 18 volatilizes into the furnace cavity under the vacuum state, so that the pressure in the furnace cavity continuously rises.​

[0125] In some embodiments, the controller can control each baking cycle by a time length. For example, the time length of each baking cycle can be preset as ΔT, the controller starts timing after each time the vacuum valve is controlled to be closed and the vacuum pump is controlled to be stopped, determines the end of the baking cycle when the timing time length reaches ΔT, and samples the pressure in the furnace cavity by the pressure sensor to determine the second pressure value P4 in the furnace cavity at the end of the baking cycle as the sampled pressure value.

[0126] In some embodiments, the controller can control each baking cycle by a time length. For example, the time length of each baking cycle can be preset as ΔT, the controller starts timing after each time the vacuum valve is controlled to be closed and the vacuum pump is controlled to be stopped, determines the end of the baking cycle when the timing time length reaches ΔT, and samples the pressure in the furnace cavity by the pressure sensor to determine the second pressure value P4 in the furnace cavity at the end of the baking cycle as the sampled pressure value.

[0127] In some embodiments, the controller can control each baking cycle by a time length. For example, the time length of each baking cycle can be preset as ΔT, the controller starts timing after each time the vacuum valve is controlled to be closed and the vacuum pump is controlled to be stopped, determines the end of the baking cycle when the timing time length reaches ΔT, and samples the pressure in the furnace cavity by the pressure sensor to determine the second pressure value P4 in the furnace cavity at the end of the baking cycle as the sampled pressure value.

[0128] In the embodiments of the present application, in the process of obtaining a plurality of pressure values at different times in the furnace cavity, the first pressure value at the beginning of the baking cycle and the second pressure value at the end of the baking cycle are obtained, and the pressure change rate of the baking cycle is determined according to the first pressure value and the second pressure value, which can reduce the amount of data and improve the detection efficiency.

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

[0130] Figure 4 A control flow diagram in a baking process provided by some embodiments of the present application is shown. As shown in FIG. 1, before the beginning of each baking cycle, the controller 12 first controls the vacuum valve to be opened and the vacuum pump to be started, so as to vacuum the pressure in the furnace cavity to below the first preset pressure P1, and then controls the vacuum valve to be closed and the vacuum pump to be stopped. After vacuuming the pressure in the furnace cavity to below the first preset pressure P1, the controller determines the beginning of the baking cycle and starts timing. Figure 4

[0131] ​Then, the controller 12 continues to sample the pressure in the furnace cavity through the pressure sensor 16. In the case that the pressure in the furnace cavity obtained by a sampling is greater than or equal to a preset pressure (for the sake of distinction, the preset pressure is referred to as a second preset pressure P2), it can be determined that the roasting period ends, and the pressure value obtained by the sampling is taken as the second pressure value P4 at the end of the roasting period. Alternatively, the controller can again sample the pressure in the furnace cavity through the pressure sensor 16, and determine the pressure value obtained by the sampling as the second pressure value P4 at the end of the roasting period. At the same time, the timing duration, which is the period duration of the roasting period, can be ended.

[0132] In the process of calculating the pressure change rate of the roasting period, 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 furnace cavity in the roasting period.

[0133] In the embodiments of the present application, the current roasting period is determined to end when the pressure in the furnace cavity rises to the preset pressure, which can make the pressure in the furnace cavity in each roasting period not higher than the preset pressure, so that the moisture in the battery in each roasting period can be volatilized at a higher rate, thereby improving the roasting efficiency of the battery.

[0134] Optionally, the method can further include: introducing dry gas into the furnace cavity every certain period of time.

[0135] Figure 5 A composition schematic diagram of another roasting system provided by some examples of the present application is shown. As shown in the figure, Figure 5 The furnace cavity of the vacuum furnace 11 can be connected to a dry gas source 111 through a gas supplement valve 110, the gas supplement valve 110 is connected to the controller 12, and the controller 12 can introduce the dry gas in the dry gas source 111 into the furnace cavity of the vacuum furnace 11 after controlling the gas supplement valve 110 to open. The dry gas can be dry inert gas, such as nitrogen.

[0136] Exemplarily, a gas supplement duration, for example, 1 hour, can be set in advance. The controller 12 starts timing after entering the first roasting period, 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 to vacuum the pressure in the furnace cavity to the first preset pressure P1. After the timing starts, when the timing duration reaches 1 hour, the controller 12 controls the gas supplement valve 110 to open for the gas supplement duration and then to close, to introduce a certain amount of dry gas into the furnace cavity.

[0137] Then, the controller 12 can clear the timing duration, and restart timing, and control the air supplement valve 110 to open for the air supplement duration and then close when the next timing duration reaches 1 hour. The controller 12 circulates timing, and controls the air supplement valve 110 to open to introduce dry gas into the furnace cavity until the baking is completed when the timing duration reaches 1 hour.

[0138] In the process of introducing dry gas into the furnace cavity every other period of time, if the timing duration reaches the air supplement duration when a baking period starts, the controller can first introduce dry gas into the furnace cavity, and then control the vacuum pump to start vacuumizing the furnace cavity.

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

[0140] In the process of vacuumizing, the dry gas can be mixed with the moisture in the furnace cavity, and 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 is beneficial to the evaporation of the moisture in the battery into the furnace cavity, thereby improving the baking efficiency of the battery.

[0141] In the embodiments of the present application, dry gas is introduced into the furnace cavity every other period of time, which can periodically introduce dry gas into the furnace cavity, reduce the water content in the furnace cavity, and facilitate the evaporation of the 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 can be introduced into the furnace cavity before each baking period starts, and dry gas can be introduced into the furnace cavity every other baking period.

[0143] As shown in FIG. 1, Figure 5 Before each baking period starts, the controller 12 can first control the air supplement valve 110 to open to introduce dry gas into the furnace cavity, and control the air supplement valve 110 to close after the air supplement valve 110 is opened for a preset air supplement duration, so as to introduce a certain amount of dry gas into the furnace cavity. After the air supplement valve 110 is closed, the controller 12 can control the vacuum valve 14 to open, and control the vacuum pump 13 to start vacuumizing the furnace cavity, so as to vacuumize the pressure in the furnace 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 period.

[0144] In the process of introducing dry gas into the furnace cavity, the controller can also control the amount of inert gas introduced into the furnace cavity by other ways.

[0145] As shown in FIG. 1, Figure 5As shown, the controller 12 determines the end of the baking cycle when the pressure in the furnace chamber reaches the second preset pressure P2, at which time the controller 12 can control the air supplement valve 110 to open, and detect the pressure in the furnace chamber through the pressure sensor 16, and when the pressure in the furnace chamber reaches the third preset pressure, the air supplement valve 110 is closed to stop the dry gas from being introduced into the furnace chamber. Then, the controller 12 can control the vacuum valve 14 to open, and control the vacuum pump 13 to start vacuumizing the furnace chamber to below the first preset pressure PI to start the next adjacent baking cycle. It should be understood that the method of introducing dry gas into the furnace chamber can include but is not limited to the above examples.

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

[0147] In some embodiments, the dry gas can be introduced into the furnace chamber when the number of the current baking cycle reaches the target number of cycles.

[0148] For example, the target number of cycles can be an even number, and the controller can control the air supplement valve to open to introduce dry gas into the furnace chamber before the start of the current baking cycle when the number of the current baking cycle is determined to be an even number. For example, after entering the first baking cycle, the controller can determine that the number of the current baking cycle is an even number when the number of the baking cycle is determined to be 1, 3, 5, 7, etc. odd number after the end of the baking cycle, and the controller can control the air supplement valve to open to introduce dry gas into the furnace chamber when the number of the current baking cycle is an even number.

[0149] For example, the controller can introduce dry gas into the furnace chamber every preset number of baking cycles to introduce dry gas into the furnace chamber when the number of the current baking cycle reaches the target number of cycles. For example, the preset number is 4, and before the start of the first baking cycle, the controller can 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, the controller can control the air supplement valve to open to introduce dry gas into the furnace chamber before the start of the current baking cycle when the number of the current baking cycle is determined to be 4, 8, 12, 16, etc. target number of cycles, and then control the vacuum valve to open and control the vacuum pump to start vacuumizing the furnace chamber.

[0150] Exemplarily, the target cycle number can be a preset cycle number. For example, the target cycle number can be preset as 4, 6, 11, 16, 20, etc. Before starting of each baking cycle, the controller can count the cycle number of the baking cycle, and in the case that the cycle number of the current baking cycle is the target cycle number of 4, 6, 11, 16, 20, etc., the controller can control the air supplement valve to open before starting of the current baking cycle, so as to introduce dry gas into the furnace chamber, and then control the vacuum valve to open and control the vacuum pump to start vacuumizing the furnace chamber.

[0151] Figure 6 A schematic diagram of pressure variation in the furnace chamber in a baking process is shown. Figure 6 The horizontal coordinate is time, in minutes, and the vertical coordinate is pressure, in Pa. The curve 61 is a pressure variation curve in the furnace chamber.

[0152] Taking one of the baking cycles as an example, the starting time of the baking cycle is time T1 shown in Figure 6 and the ending time is time T2 shown in Figure 6 Before starting of the baking cycle, the controller controls the vacuum valve to open and controls the vacuum pump to start, and the pressure in the furnace chamber is vacuumized to the first preset pressure P1 at time T1. The controller controls the vacuum valve to close and controls the vacuum pump to stop, and the baking cycle starts. Meanwhile, the controller detects that the pressure in the furnace chamber rises to the second preset pressure P2 at time T2, and determines that the baking cycle ends. In the baking cycle, the pressure in the furnace chamber rises from the first preset pressure P1 to the second preset pressure P2.

[0153] Taking another of the baking cycles as an example, the starting time of the baking cycle is time T3 shown in Figure 6 and the ending time is time T4 shown in Figure 6 and the cycle number of the baking cycle is a preset target cycle number. Before starting of the baking cycle, the controller controls the air supplement valve to open, so as to introduce dry gas into the furnace chamber, and then controls the vacuum valve to open and controls the vacuum pump to start, and the pressure in the furnace chamber is vacuumized to the first preset pressure P1 at time T3. The baking cycle starts. At time T4, the controller detects that the pressure in the furnace chamber rises to the second preset pressure P2, and the controller determines that the baking cycle ends.

[0154] Before starting of the baking cycle, the pressure in the furnace chamber rises to above the pressure P5 first, and then is vacuumized to the first preset pressure P1, and then rises from the first preset pressure P1 to the second preset pressure P2.

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

[0156] The above is only an example, and the target number of cycles can be flexibly set according to requirements, and can include but is not limited to the above examples.

[0157] In the embodiment of the present application, the dry gas is introduced into the furnace cavity when the number of cycles of the current baking cycle is the target number of cycles, which can reduce the frequency of introducing dry gas into the furnace cavity while improving the volatilization efficiency of moisture in the battery, thereby improving the baking efficiency.

[0158] Figure 7 A flowchart of a battery baking method provided by some embodiments of the present application is shown. As shown in Figure 7 The method can include steps 71 to 77.

[0159] Step 71, preheat the battery.

[0160] In some embodiments, the battery in the furnace cavity can be preheated before the first baking cycle starts. For example, the controller can first start the heating member to heat the furnace cavity, and when the temperature in the furnace 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 is started, and the battery is formally baked.

[0161] As shown in Figure 1 After the battery 18 is placed in the vacuum furnace 11, the controller 12 can first start the heating member at the bottom of the tray 17 to heat the furnace cavity, that is, to heat 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, and when the timing duration reaches the preset heating duration, it is determined that the temperature in the furnace cavity is stabilized at the preset temperature.

[0162] After it is determined that the temperature in the furnace cavity is stabilized at the preset temperature, the controller 12 can control the vacuum valve 14 to open and control the vacuum pump 13 to start to vacuumize the furnace cavity. During the vacuumizing process, after detecting that the pressure in the furnace 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 is started.

[0163] Among them, since the temperature change in the battery is slow, during the preheating process, when the temperature in the furnace cavity just rises to the preset temperature, the temperature in 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 the embodiment, the batteries in the furnace chamber are preheated for a period of time before starting the baking cycle, so that the temperature inside the batteries approaches or equals the temperature in the furnace chamber, thereby improving the evaporation efficiency of the moisture in the batteries, and further improving the baking efficiency.

[0165] Step 72, vacuumize the pressure in the furnace chamber to the first preset pressure.

[0166] In the embodiment, after the batteries in the furnace chamber are preheated, the first baking cycle can be started. Before starting each baking cycle, the controller can control the vacuum valve to open and control the vacuum pump to start, and vacuumize the furnace chamber.

[0167] At the same time, the pressure in the furnace chamber is sampled by the pressure sensor, and when the sampled pressure value is less than or equal to the first preset pressure, it is determined that the pressure in the furnace chamber is vacuumized 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 vacuumizing. At the same time, the sampled pressure value can be determined as the first pressure value at the start 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 the second preset pressure.

[0170] In the embodiment, after starting each baking cycle, the controller can continuously sample the pressure in the furnace chamber through the pressure sensor, and determine whether the sampled pressure value is greater than the second preset pressure. When the sampled pressure value is less than the second preset pressure, it is determined that the current baking cycle has not ended, and steps 73 and 74 can be returned to be executed.

[0171] On the contrary, when the pressure value obtained in a certain sampling is greater than or equal to the second preset pressure, it is determined that the pressure in the furnace chamber rises to above the second preset pressure, and it is determined that the current baking cycle ends, and step 75 is executed. At the same time, the sampled pressure value 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 the preset change rate.

[0174] In this embodiment, after determining that the current baking cycle ends, the controller can calculate the pressure change rate of the current baking cycle in the furnace cavity according to the first pressure value and the second pressure value, and determine that the water content of the battery placed in the furnace cavity is higher than a specified value when the pressure change rate is greater than a preset change rate, that is, 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 step 72 can be returned to start the adjacent next 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 performed.

[0176] Step 77, determining that the water content of the battery meets the requirement.

[0177] Wherein, after determining that the water content of the battery meets the requirement, the baking can be ended, or the baking of the battery can be stopped after continuing to bake the battery for a period of time.

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

[0179] The acquisition module 81 is configured to acquire a plurality of pressure values at different times in the furnace cavity during the battery baking process.

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

[0181] In some embodiments, the determination module 82 is specifically configured to determine the pressure change rate in the furnace cavity according to the plurality of pressure values, and determine that 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 furnace cavity includes the pressure change rate of the current baking cycle in the furnace cavity, and the determination module 82 is specifically configured to determine that the water content of the battery meets the requirement when the pressure change rate of the current baking cycle is less than or equal to a preset change rate.

[0183] In some embodiments, the pressure change rate in the furnace cavity includes the pressure change rate of a plurality of continuous baking cycles in the furnace cavity, and the determination module 82 is specifically configured to determine that the water content of the battery meets the requirement when the pressure change rate of the plurality of continuous baking cycles is less than or equal to a preset rate.

[0184] In some embodiments, 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.

[0185] In some embodiments, the obtaining module 81 is further configured to, in each baking cycle, if it is detected that the pressure in the furnace cavity reaches the preset pressure, determine that the baking cycle ends, 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 comprises a supplying module configured to supply dry gas into the furnace cavity at intervals.

[0187] In some embodiments, the supplying module is specifically configured to supply dry gas into the furnace cavity before the start of each baking cycle.

[0188] In some embodiments, the supplying module is specifically configured to supply dry gas into the furnace cavity in the case where the number of cycles of the current baking cycle reaches the target number of cycles.

[0189] Figure 9 A structural block diagram of a battery baking device is shown. As shown in Figure 9 the battery baking device 9 comprises a processor 91 and a memory 92, and each of the above devices can be connected through one or more buses 94.

[0190] The battery baking device 9 further comprises a computer program 93 stored in the memory 92, and when the computer program 93 is executed by the processor 91, the battery baking device 9 executes the above Figure 2 and Figure 7 the method shown. Wherein all the related contents of each step involved in the above method embodiments can be cited to the function description of the corresponding entity device, and will not be repeated here.

[0191] The embodiments of the present application also provide a readable storage medium, which comprises a computer program, and when the computer program runs on a computer, the computer executes the method provided by the above method embodiments.

[0192] The embodiments of the present application also provide a computer program product comprising instructions, and when the computer program product runs on a computer, the computer executes the method provided by the above method embodiments.

[0193] The embodiments of the present application also provide a chip system comprising a memory and a processor, 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 the battery baking device installed with the chip system executes the method provided by the above method embodiments.

[0194] Wherein, the chip system can comprise 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 appreciated that in the embodiments of the present application, the processor can be a central processing unit (CPU), and the processor can 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 gates or transistor logic components, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

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

[0197] Those skilled in the art can clearly understand that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0198] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working processes of the above-described system, device and unit can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

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

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

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

[0202] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing 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 methods described in the various embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[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 can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery baking method, characterized by, The method comprises: acquiring a plurality of pressure values at different time points in a furnace cavity during a battery baking process, wherein the plurality of pressure values comprise a first pressure value at the beginning of a baking cycle and a second pressure value at the end of the baking cycle; determining that the water content of the battery meets a requirement according to the plurality of pressure values, so as to stop baking the battery; wherein the determining that the water content of the battery meets the requirement according to the plurality of pressure values comprises: determining a pressure change rate in the furnace cavity according to the plurality of pressure values; determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity. The method further comprises: introducing dry gas into the furnace cavity at intervals.

2. The method of claim 1, wherein, The pressure change rate in the furnace cavity comprises a pressure change rate of a current baking cycle in the furnace cavity, and the determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity comprises: determining that the water content of the battery meets the requirement in a case where the pressure change rate of the current baking cycle is less than or equal to a preset change rate.

3. The method of claim 1, wherein, The pressure change rate in the furnace cavity comprises pressure change rates of a plurality of continuous baking cycles in the furnace cavity, and the determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity comprises: determining that the water content of the battery meets the requirement in a case where the pressure change rates of the plurality of continuous baking cycles are less than or equal to a preset rate.

4. The method of claim 1, wherein, The method further comprises: in each baking cycle, if it is detected that the pressure in the furnace cavity reaches a preset pressure, determining that the baking cycle ends, and determining the detected pressure value as the second pressure value at the end of the baking cycle.

5. The method of claim 1, wherein, The introducing dry gas into the furnace cavity at intervals comprises: introducing dry gas into the furnace cavity before the beginning of each baking cycle.

6. The method of claim 1, wherein, The introducing dry gas into the furnace cavity at intervals comprises: in a case where the number of the current baking cycle reaches a target number of cycles, introducing dry gas into the furnace cavity.

7. A battery baking apparatus characterized by comprising: The method comprises: an acquisition module, configured to acquire a plurality of pressure values at different time points in a furnace cavity during a battery baking process, wherein the plurality of pressure values comprise a first pressure value at the beginning of a baking cycle and a second pressure value at the end of the baking cycle; a determination module, configured to determine that the water content of the battery meets a requirement according to the plurality of pressure values, so as to stop baking the battery; wherein the determining that the water content of the battery meets the requirement according to the plurality of pressure values comprises: determining a pressure change rate in the furnace cavity according to the plurality of pressure values; and determining that the water content of the battery meets the requirement according to the pressure change rate in the furnace cavity.

8. A readable storage medium, characterized by, The computer program is stored on the readable storage medium and, when the computer program runs on a battery baking device, causes the battery baking device to perform the method according to any one of claims 1-6.

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