A cell baking method and apparatus

Abstract

The present disclosure relates to a kind of electric core baking method and equipment, electric core baking method includes: test electric core is placed into baking chamber;According to the preheating operation of first vacuum level of the vacuum value of the baking chamber;Cyclic execution at least n times the preheating operation;Wherein, n is greater than or equal to 1 Positive integer;According to the drying operation of second vacuum level of the vacuum value of the baking chamber to the test electric core;Wherein, the first vacuum level is atmospheric pressure, the first vacuum level is greater than the second vacuum level.The present disclosure is advantageous to shorten baking heating time, in turn, reduce energy consumption, improve drying efficiency.

Description

Technical Field

[0001] This disclosure relates to the field of battery technology, and in particular to a method and apparatus for baking battery cells. Background Technology

[0002] Cell baking technology is mainly used in the lithium battery production process to dry the battery electrodes to ensure electrochemical and safety performance. Baking is a key process in battery manufacturing, so the water content inside the cell is related to the final performance of the cell.

[0003] In traditional baking processes, heating is divided into contact thermal radiation heating and hot air circulation heating. The internal temperature of the battery cell generally takes a long time to rise. In the later stages of baking, the moisture removal rate of the battery cell is slow, which leads to an extension of the overall baking time. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a cell baking method and apparatus, including:

[0005] Place the test cell into the baking chamber;

[0006] Preheating is performed according to the vacuum level of the baking chamber, which is the first vacuum level.

[0007] The preheating process is performed at least n times; where n is a positive integer greater than or equal to 1.

[0008] The test cell is dried according to the vacuum level of the baking chamber, which is the second vacuum level.

[0009] Wherein, the first vacuum level is at atmospheric pressure, and the first vacuum level is greater than the second vacuum level.

[0010] In some embodiments, the preheating process according to the vacuum value of the baking chamber as a first vacuum level includes:

[0011] The vacuum pump is controlled to evacuate the baking chamber;

[0012] The baking chamber is filled with inert gas to the first vacuum level to perform the preheating process.

[0013] In some embodiments, the preheating process includes:

[0014] The baking chamber is preheated to a preset temperature and maintained for a first preset duration;

[0015] The vacuum pump is controlled to evacuate the baking chamber and inert gas is introduced into the baking chamber to the first vacuum level.

[0016] In some embodiments, the drying operation of the test cell according to the vacuum value of the baking chamber as a second vacuum level includes:

[0017] The vacuum pump is controlled to evacuate the baking chamber until the vacuum value of the baking chamber is the second vacuum value;

[0018] Maintain the vacuum value within the baking chamber unchanged and continue heating for a second preset time;

[0019] The inert gas in the baking chamber is replaced to bring the vacuum level in the baking chamber to the first vacuum level.

[0020] In some embodiments, after drying the test cell according to the vacuum level of the baking chamber (second vacuum level), the process further includes:

[0021] The drying operation is performed at least m times, where m is a positive integer greater than or equal to 2.

[0022] In some embodiments, the cell baking apparatus includes at least one vacuum pump and a plurality of baking chambers, wherein one of the vacuum pumps is connected to at least two of the baking chambers;

[0023] Before performing the drying operation on the test cell according to the second vacuum level of the baking chamber, the method further includes:

[0024] The vacuum pump is controlled to evacuate one of the baking chambers until the vacuum value of the baking chamber is a third vacuum value, and the vacuum value is maintained for a third preset time.

[0025] Within a third preset time period, the vacuum pump is controlled to perform vacuuming on the other baking chambers;

[0026] The third vacuum value is greater than the second vacuum level and less than the first vacuum level.

[0027] In some embodiments, after drying the test cell according to the vacuum level of the baking chamber (second vacuum level), the process further includes:

[0028] The baking chamber is controlled to maintain the second vacuum level for a time that meets the fourth preset duration.

[0029] In some embodiments, the method further includes: after drying the test cell according to the vacuum value of the baking chamber at a second vacuum level, the method further includes:

[0030] A portion of the test cells were removed from the baking chamber for testing, while maintaining the vacuum level in the baking chamber at the fourth vacuum level.

[0031] The fourth vacuum level is lower than the first vacuum level.

[0032] In a second aspect, this disclosure provides a battery cell baking apparatus, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of any of the battery cell baking methods provided in the first aspect.

[0033] In some embodiments, it further includes: at least one vacuum pump and multiple baking chambers;

[0034] One of the vacuum pumps is connected to at least two of the baking chambers.

[0035] The technical solution provided in this disclosure has the following advantages compared with the prior art:

[0036] The battery cell baking method disclosed herein includes placing a test battery cell into a baking chamber; performing a preheating treatment operation according to the vacuum value of the baking chamber as a first vacuum level; cyclically performing the preheating treatment operation at least n times; where n is a positive integer greater than or equal to 1; and performing a drying operation on the test battery cell according to the vacuum value of the baking chamber as a second vacuum level; wherein the first vacuum level is atmospheric pressure and is greater than the second vacuum level. Compared with traditional baking processes, this disclosure performs multiple preheating treatment operations on the baking chamber and removes the water vapor generated during the preheating process, thereby achieving the purpose of rapidly releasing and removing water vapor inside the battery cell. This avoids insufficient preheating that would prevent the water inside the battery cell from being removed, affecting the baking effect of the battery cell, and helps to shorten the baking heating time, thereby reducing energy consumption and improving drying efficiency. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0038] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A schematic flowchart of a battery cell baking method provided in an embodiment of this disclosure;

[0040] Figure 2 A comparative schematic diagram of moisture testing of battery cells under different baking environments provided in this embodiment of the present disclosure;

[0041] Figure 3This is a schematic diagram of the structure of a battery cell baking device provided in an embodiment of the present disclosure;

[0042] Figure 4 This is a schematic diagram of another battery cell baking device provided in an embodiment of the present disclosure. Detailed Implementation

[0043] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0044] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0045] To address the aforementioned problems, this disclosure provides a method for baking battery cells. Figure 1 This is a schematic flowchart of a battery cell baking method provided in an embodiment of the present disclosure, with reference to... Figure 1 The cell baking methods include:

[0046] S101. Place the test cell into the baking chamber.

[0047] S102. Perform preheating treatment according to the vacuum level of the baking chamber as the first vacuum level.

[0048] S103. Execute the preheating operation at least n times in a loop; where n is a positive integer greater than or equal to 1.

[0049] S104. Dry the test cells according to the second vacuum level of the baking chamber.

[0050] The first vacuum level is at atmospheric pressure, and the first vacuum level is greater than the second vacuum level.

[0051] For example, a battery cell baking device is typically used to bake the test battery cells. This device includes a baking chamber and a vacuum pump. The baking chamber is used to place the test battery cells and heat them, while the vacuum pump is used to adjust the vacuum level (which can be understood as the vacuum value or pressure value; in this embodiment, it can be understood as the pressure value within the baking chamber) within the baking chamber. Different vacuum levels require different amounts of energy to bake the test battery cells. For example, a lower vacuum level indicates a lower pressure value, belonging to a high vacuum environment, where water vapor evaporation requires lower temperatures and energy; conversely, a higher vacuum level indicates a higher pressure value, belonging to a low vacuum environment.

[0052] In this embodiment, when baking the test cells, multiple test cells are first placed into the baking chamber, and the door of the baking chamber is closed once it is full. Then, a preheating process is performed on the baking chamber. At this time, the vacuum value of the baking chamber is only the first vacuum level, i.e., the preheating process is performed under normal pressure. During the preheating process, some moisture inside the test cells evaporates into the baking chamber. The evaporated water vapor leads to high humidity in the baking chamber, so the water vapor is discharged from the baking chamber, and the vacuum value of the baking chamber is controlled again to the first vacuum level. The preheating process continues, and this cycle is repeated. The preheating process is repeated at least n times, where n is a positive integer greater than or equal to 1. For example, each preheating session lasts 40 minutes, and at least two preheating processes are performed to gradually evaporate the moisture inside the test cells and discharge it from the baking chamber.

[0053] After the preheating stage, the test cells are dried according to the second vacuum level of the baking chamber. The second vacuum level is lower than the first vacuum level; for example, the first vacuum level is atmospheric pressure (98000-103000 Pa), while the second vacuum level is lower than atmospheric pressure (e.g., 15-30 Pa). A vacuum level of the second vacuum level constitutes a high vacuum environment. Drying the test cells in a high vacuum environment helps reduce energy consumption. Furthermore, due to the multiple preheating processes, the moisture inside the test cells is thoroughly dried out, resulting in a shorter drying time. Overall, this shortens the baking time of the test cells and ensures more thorough drying, thus improving the drying effect.

[0054] Compared to traditional baking processes, this embodiment performs multiple preheating operations on the baking chamber and removes the moisture generated during the preheating process, thereby achieving the goal of rapidly releasing and expelling moisture from inside the battery cell. This avoids insufficient preheating that could prevent moisture from being expelled from the battery cell, affecting the baking effect, and helps to shorten the baking time, thereby reducing energy consumption and improving drying efficiency.

[0055] In some embodiments, the preheating process is performed according to the vacuum level of the baking chamber as a first vacuum level, including:

[0056] The vacuum pump is controlled to evacuate the baking chamber.

[0057] Inert gas is introduced into the baking chamber to the first vacuum level for preheating.

[0058] Specifically, after the test battery is placed in the baking chamber, which is filled with air and at atmospheric pressure, an inert gas is used to replace the air in the baking chamber to prevent chemical reactions during the baking process. First, a vacuum pump is controlled to evacuate the baking chamber, for example, to 1000 Pa and then stopped. Then, inert gas is introduced into the baking chamber to the first vacuum level for preheating. It should be noted that the timing of stopping the vacuuming can be chosen according to actual needs. In this embodiment, 1000 Pa is chosen to shorten the vacuuming time; this value is only for illustrative purposes.

[0059] In some embodiments, the preheating process includes:

[0060] Control the baking chamber to preheat to the preset temperature and maintain it for the first preset time;

[0061] The vacuum pump is controlled to evacuate the baking chamber and inert gas is introduced into the baking chamber to the first vacuum level.

[0062] Specifically, the preheating process includes controlling the heating of the baking chamber to reach a preset temperature, such as 90-110℃, and maintaining this temperature for a first preset duration, such as 1800s-2400s. After the first preset preheating duration is met, some moisture inside the test battery evaporates into the baking chamber. The high moisture content in the baking chamber can affect subsequent heating. Therefore, a vacuum pump is used to evacuate the baking chamber, removing the inert gas containing a large amount of moisture. For example, evacuation lasts for 1-30s. After evacuation, inert gas is refilled into the baking chamber to the first vacuum level, completing one preheating cycle. Subsequent cycles of preheating can be repeated, for example, 1-3 times.

[0063] The key feature of this disclosure is the cyclic preheating process. In each preheating operation, the moisture produced during baking is discharged and replaced with dry inert gas for repeated preheating. This improves the preheating effect and the drying effect of the tested battery, reducing the time required for subsequent drying operations. Furthermore, it helps to shorten the overall baking and heating time, thereby reducing energy consumption and improving drying efficiency.

[0064] In some embodiments, the test cell is dried according to the vacuum level of the baking chamber as a second vacuum level, including:

[0065] The vacuum pump is controlled to evacuate the baking chamber until the vacuum value of the baking chamber reaches the second vacuum value.

[0066] Maintain the vacuum value inside the baking chamber and continue heating for the second preset time;

[0067] The inert gas in the baking chamber is replaced to bring the vacuum level in the baking chamber to the first vacuum level.

[0068] For example, after the preheating stage, the drying stage begins. During the drying stage, the test cells are typically baked at high temperature under a high vacuum environment to rapidly evaporate any remaining moisture. For instance, a vacuum pump is controlled to evacuate the baking chamber until the vacuum value reaches a second vacuum level. This vacuum level is maintained while heating continues for a second preset time. Once the second preheating time is met, the moisture content in the baking chamber is high. The vacuum pump can then be controlled to evacuate the baking chamber, removing the inert gas containing a large amount of moisture and filling it with inert gas to a first vacuum level. The drying operation is then complete. When the baking chamber reaches the first vacuum level (at atmospheric pressure), the door can be opened, and the test cells can be removed to test the baking effect.

[0069] In some embodiments, after drying the test cell according to the vacuum level of the baking chamber as a second vacuum level, the process further includes:

[0070] The drying operation is performed at least m times in a loop, where m is a positive integer greater than or equal to 2.

[0071] For example, considering practical application scenarios, the drying operation can be performed multiple times to achieve a better drying effect. After performing one drying operation, the moisture inside the test battery may not be completely released. The test cell can then be dried again at the second vacuum level of the baking chamber, and this drying operation can be repeated at least m times. Here, m is a positive integer greater than or equal to 2. For example, after 2-5 cycles of drying operations, the moisture inside the test cell will be fully evaporated, completing the baking process for the test cell.

[0072] This embodiment of the invention employs multiple drying operations. In each drying operation, the moisture generated during baking is discharged and replaced with dry inert gas for the next drying operation, thereby improving the drying effect and reducing the time required for subsequent operations. Furthermore, it helps to shorten the overall baking and heating time, thereby reducing energy consumption and improving drying efficiency.

[0073] In some embodiments, the cell baking equipment includes at least one vacuum pump and a plurality of baking chambers, wherein the vacuum pump is connected to at least two baking chambers;

[0074] Before drying the test cells according to the second vacuum level of the baking chamber, the process also includes:

[0075] The vacuum pump is controlled to evacuate one of the baking chambers until the vacuum value of the baking chamber is the third vacuum value, and the vacuum value is maintained for the third preset time.

[0076] Within the third preset time period, the vacuum pump is controlled to perform vacuuming on the other baking chambers;

[0077] The third vacuum level is greater than the second vacuum level but less than the first vacuum level.

[0078] In this embodiment of the disclosure, the battery cell baking device used for baking the battery cells includes at least one vacuum pump and multiple baking chambers. One vacuum pump is connected to at least two baking chambers, meaning that each vacuum pump is capable of providing a vacuum environment for at least two baking chambers. However, it should be understood that the vacuum pump cannot provide a sufficient vacuum value to two baking chambers simultaneously, so typically only one baking chamber is evacuated at a time.

[0079] Based on the above structure, before drying the test cells according to the second vacuum level of the baking chamber, the vacuum pump is controlled to evacuate one of the baking chambers until the vacuum level reaches the third vacuum level, and this evacuation is maintained for a third preset time. Since the second vacuum level is lower than the third vacuum level, directly reaching the second vacuum level from the first vacuum level would take too long and affect the normal operation of other baking chambers corresponding to that vacuum pump. Therefore, after the preheating process, the vacuum level of the baking chamber is adjusted from the first vacuum level to the third vacuum level as a transition, and this adjustment is maintained for a third preset time, such as 900-1800 seconds. During this time, the vacuum pump is controlled to evacuate other baking chambers to avoid affecting their operation. After the third preset time has elapsed, the vacuum pump is controlled again to evacuate the baking chamber, adjusting its vacuum level from the third vacuum level back to the second vacuum level. The third vacuum level is greater than the second vacuum level but less than the first vacuum level; for example, the second vacuum level is 15-30 Pa, and the third vacuum level is 100-300 Pa.

[0080] In some embodiments, after drying the test cell according to the vacuum level of the baking chamber as a second vacuum level, the process further includes:

[0081] The time for which the baking chamber maintains the second vacuum level meets the fourth preset duration.

[0082] For example, after the drying operation is completed, the baking chamber can be controlled to maintain a second vacuum level until the duration meets a fourth preset time, such as 3000-3600 seconds, at which point the entire baking process is complete. This step avoids the problem of residual moisture caused by incomplete removal of moisture from the test cells during the previous drying operation. By controlling the baking chamber to maintain a second vacuum level, drying can be performed again without replacing the inert gas, which would carry away heat and cause heat loss. Therefore, the baking effect can be further improved by testing the battery.

[0083] In some embodiments, after drying the test cell according to the vacuum level of the baking chamber as a second vacuum level, the method further includes:

[0084] Remove some test cells from the baking chamber for testing, and maintain the vacuum level of the baking chamber at the fourth vacuum level.

[0085] The fourth vacuum level is lower than the first vacuum level.

[0086] For example, after drying, the vacuum level in the baking chamber is adjusted to atmospheric pressure. The door of the baking chamber is opened, and some test cells are removed for testing. However, some untested test cells remain in the baking chamber. To avoid affecting the baking effect, the vacuum level inside the baking chamber is maintained at the fourth vacuum level. The fourth vacuum level is lower than the low vacuum level, meaning it is also in a high vacuum environment, where heat preservation is better. The fourth vacuum level can be 300-500 Pa; if a lower pressure is required, it can be 15-30 Pa for even better heat preservation.

[0087] This disclosure primarily achieves the goal of rapidly releasing and expelling moisture from inside the battery cell by performing multiple preheating processes on the baking chamber and discharging the moisture generated during the preheating process. The specific operating steps are explained below using a complete embodiment:

[0088] S201. Place the test cell into the baking chamber, and close the chamber door after it is full.

[0089] S202. Control the vacuum pump to evacuate the baking chamber to 1000Pa, and then fill the baking chamber with inert gas to the first vacuum level.

[0090] S203. Control the baking chamber to preheat to the preset temperature and maintain it for a first preset time, such as 1800-2400s.

[0091] S204. Control the vacuum pump to evacuate the baking chamber, for example, for 1-30 seconds, and fill the baking chamber with inert gas to the first vacuum level.

[0092] S205, repeat S203 and S204, looping 1-3 times.

[0093] S206. Control the vacuum pump to evacuate the baking chamber until the vacuum value of the baking chamber is the third vacuum value, and maintain it for the third preset time, such as 900-1800s.

[0094] S207. Control the vacuum pump again to evacuate the baking chamber until the vacuum value of the baking chamber is the second vacuum value, and maintain it for the second preset time, such as 4500-6000s.

[0095] S208. Replace the inert gas in the baking chamber to make the vacuum value in the baking chamber the first vacuum level.

[0096] S209, repeat S207 and S208, repeating 2-5 times.

[0097] S210, control the baking chamber to maintain the second vacuum level for a time that meets the fourth preset duration, such as 3000-3600s.

[0098] S211. Remove some test cells from the baking chamber for testing, and maintain the vacuum level in the baking chamber at the fourth vacuum level.

[0099] The vacuum levels are as follows: Level 1 is atmospheric pressure, 98000-103000 Pa; Level 2 is 15-30 Pa; Level 3 is 100-300 Pa; and Level 4 is 300-500 Pa. Nitrogen can be used as the inert gas, with a moisture content ≤0.06 g / cm³. 3 Furthermore, the temperature during both the preheating and heating processes can be 90-110℃.

[0100] It should be noted that the above-mentioned vacuum level, various durations, temperatures, and inert gas types can all be set according to actual needs. The inert gas in this embodiment is only for illustrative purposes.

[0101] Optionally, this disclosure also provides three embodiments of baking test cells using different preheating treatment operations. By comparing the baking effects of the three embodiments, the beneficial effects brought by this disclosure can be more intuitively demonstrated.

[0102] Specifically, in Example 1, the specific steps are as follows:

[0103] S301. Place the 864 test cells into the baking chamber.

[0104] S302. Test cell preheating, preheating time is 80-120min, preheating temperature rise to 95℃;

[0105] S303. Control the vacuum pump to perform vacuuming operation, vacuum to 30-100Pa, and bake for 100-150 minutes.

[0106] S304, replace with nitrogen, fill with 60-100KPa nitrogen, and heat with circulating air for 5-10 minutes;

[0107] S305, steps S303, and S304 are repeated 3 times;

[0108] S306, maintain pressure to 30-100Pa until the baking process is complete.

[0109] At the end of the baking process, the test cells were removed and the moisture content was tested using a Karl Fischer moisture analyzer. The moisture content was <250 ppm. The test conditions included: temperature 170℃, test time 600s, gas flow rate 80mL / min; sample mass 0.8-1.2g, and relative drift value 8ug / min.

[0110] In Example 2, a 120Ah short-blade lithium iron phosphate cell with a cell length of 500mm was used for testing. The specific steps are as follows:

[0111] S311. After stacking 864 test cells, place them into the baking chamber.

[0112] S312. Test cell preheating, preheating time is 40 minutes, preheating temperature rises to 90℃.

[0113] S313. Control the vacuum pump to perform a vacuuming operation, vacuum for 10-30 seconds, and then fill with 100 kPa nitrogen gas and heat for 5 minutes.

[0114] Steps S314, S312, and S313 are repeated once to repeat the preheating process.

[0115] S315. Keep the vacuum environment dry, evacuate to 30-100Pa, and bake for 120 minutes.

[0116] S316. Perform nitrogen purging, fill with 60-100 kPa nitrogen, and circulate air for heating for 10 minutes.

[0117] Steps S317, S315, and S316 are repeated 3 times.

[0118] S318, maintain pressure to 30-100Pa until the baking process is complete.

[0119] At the end of the baking process, the test cells were removed and the moisture content was tested using a Karl Fischer moisture analyzer. The moisture content was <250 ppm. The test conditions included: temperature 170℃, test time 600s, gas flow rate 80mL / min; sample mass 0.8-1.2g, and relative drift value 8ug / min.

[0120] In Example 3, a 150Ah short-blade lithium iron phosphate cell with a cell length of 600mm was used for testing. The specific steps are as follows:

[0121] S321. After stacking 864 test cells, place them into the baking chamber.

[0122] S322. Test cell preheating, preheating time is 40 minutes, preheating temperature rises to 90℃.

[0123] S323. Control the vacuum pump to perform a vacuuming operation, vacuum for 10-30 seconds, and then fill with 100 kPa nitrogen gas and heat for 5 minutes.

[0124] Steps S324, S322, and S323 are repeated twice to repeat the preheating process.

[0125] S325. Keep the vacuum environment dry, evacuate to 30-100Pa, and bake for 100 minutes.

[0126] S326. Perform nitrogen replacement by filling with 60-100 kPa nitrogen and circulating the air for 10 minutes.

[0127] Steps S327, S325, and S326 are repeated 3 times.

[0128] S328, maintain pressure to 30-100Pa until the baking process is complete.

[0129] At the end of the baking process, the test cells were removed and the moisture content was tested using a Karl Fischer moisture analyzer. The moisture content was <250 ppm. The test conditions included: temperature 170℃, test time 600s, gas flow rate 80mL / min; sample mass 0.8-1.2g, and relative drift value 8ug / min.

[0130] Figure 2 This is a comparative schematic diagram of moisture testing of battery cells under different baking environments, provided by an embodiment of this disclosure. (Refer to...) Figure 2 The horizontal axis represents the cell group, with each group including multiple test cells, and the vertical axis represents the average moisture content of the test cells within each group. L1 represents the test result of Example 1, L2 represents the test result of Example 2, and L3 represents the test result of Example 3. The graph shows that Example 1 has the highest moisture content, while Example 3 has the lowest. During the baking process, Example 1 underwent only one preheating operation, Example 2 underwent two preheating operations, and Example 3 underwent three preheating operations. Therefore, it can be seen that the baking effects of Examples 2 and 3 are better than those of Example 1. With the increase in the number of preheating operations, the drying effect of the test cells is better, and the moisture content is lower. It should be noted that the above embodiments are only one comparative result provided by this disclosure; test time, air pressure, number of cycles, etc., will all affect the baking effect.

[0131] This disclosure also provides a battery cell baking device. Figure 3 This is a schematic diagram of a battery cell baking device provided in an embodiment of the present disclosure, with reference to... Figure 3 The battery cell baking device includes a processor 401 and a memory 402. The memory 402 stores a computer program. When the processor 401 executes the computer program, it implements the steps of any of the battery cell baking methods described in the above embodiments.

[0132] Specifically, such as Figure 3 As shown, the battery cell baking device includes at least one processor 401, at least one memory 402, and at least one communication interface 403. The various components in the battery cell baking device are coupled together via a bus system 404. The communication interface 403 is used for information transmission with external devices. It is understood that the bus system 404 is used to realize communication between these components. In addition to a data bus, the bus system 404 also includes a power bus, a control bus, and a status signal bus. However, for clarity, ... Figure 3 The general designated all buses as Bus System 404.

[0133] It is understood that the memory 402 in this embodiment may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. In some embodiments, the memory 402 stores elements such as executable units or data structures, or subsets thereof, or extended sets thereof, operating systems, and applications. In embodiments of this disclosure, the processor 401 executes the steps of the various embodiments of the methods provided in this disclosure by invoking programs or instructions stored in the memory 402.

[0134] The method provided in this disclosure can be applied to, or implemented by, processor 401. Processor 401 can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by integrated logic circuits in the hardware of processor 401 or by instructions in software form. The processor 401 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor.

[0135] The steps of the method provided in this disclosure can be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software units in the decoding processor. The software units can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other storage media mature in the art. This storage medium is located in memory 402, and processor 401 reads information from memory 402 and combines it with its hardware to complete the steps of the method.

[0136] Figure 4 This is a schematic diagram of another battery cell baking device provided in an embodiment of the present disclosure, with reference to... Figure 4 The cell baking equipment also includes: at least one vacuum pump 50 and a plurality of baking chambers 60; wherein, one vacuum pump 50 is connected to at least two baking chambers 60.

[0137] For example, Figure 4 The system includes four vacuum pumps: vacuum pump 51, vacuum pump 52, vacuum pump 53, and vacuum pump 54, and fourteen baking chambers (see attached diagram for labeling). Vacuum pump 51 is connected to baking chambers 61-64 to meet their vacuum requirements; vacuum pump 52 is connected to baking chambers 65-68 to meet their vacuum requirements; vacuum pump 53 is connected to baking chambers 69-71 to meet their vacuum requirements; and vacuum pump 54 is connected to baking chambers 72-74 to meet their vacuum requirements. This structure allows for the rational allocation of vacuum pump priorities, preventing vacuum pump resources from being occupied by adjacent ovens for extended periods or from remaining idle for long periods. Vacuum pump 50 can create different vacuum levels within the baking chambers, and different vacuum levels can have different priorities. For example, priority can be determined by pressure value; the lower the pressure value, the longer the evacuation time, and the lower the priority. Therefore, when multiple baking chambers corresponding to a vacuum pump 50 all need to be evacuated, the priority of the vacuum level will determine which baking chamber's vacuum requirement will be met first, thus rationally allocating vacuum pump resources and avoiding excessive waiting time.

[0138] This disclosure also provides a computer-readable storage medium that stores a program or instructions that cause a computer to perform the steps of any of the methods described in the above method embodiments.

[0139] The computer-readable storage medium provided in this disclosure can execute the steps of any of the methods in the above-described battery cell baking method embodiments, and therefore can also achieve the same technical effect as the above-described battery cell baking method.

[0140] In addition to the methods and cell baking equipment described above, embodiments of this application may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the method steps of various embodiments of this application.

[0141] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0142] Furthermore, embodiments of this application may also be computer-readable storage media storing computer program instructions thereon, which, when executed by processor 401, cause processor 401 to perform the method steps of various embodiments of this application.

[0143] Computer-readable storage media may take the form of any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0144] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0145] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for baking battery cells, characterized in that, The cell baking apparatus includes at least one vacuum pump and multiple baking chambers, with one vacuum pump connected to at least two of the baking chambers; the method includes: Place the test cell into the baking chamber; Preheating is performed according to the vacuum level of the baking chamber, which is the first vacuum level. The preheating process is performed at least n times; where n is a positive integer greater than or equal to 1. The test cell is dried according to the vacuum value of the baking chamber as the second vacuum level; wherein, the first vacuum level is atmospheric pressure and the first vacuum level is greater than the second vacuum level; Before performing the drying operation on the test cell according to the second vacuum level of the baking chamber, the method further includes: The vacuum pump is controlled to evacuate one of the baking chambers until the vacuum value of the baking chamber is a third vacuum value, and the vacuum value is maintained for a third preset time. The third vacuum value is greater than the second vacuum level and less than the first vacuum level. Within a third preset time period, the vacuum pump is controlled to perform vacuuming on the other baking chambers; After drying the test cell according to the second vacuum level of the baking chamber, the process further includes: A portion of the test cells inside the baking chamber are removed for testing, while maintaining the vacuum level inside the baking chamber at the fourth vacuum level; wherein the fourth vacuum level is lower than the first vacuum level.

2. The cell baking method according to claim 1, characterized in that, The preheating process according to the vacuum value of the baking chamber as the first vacuum level includes: The vacuum pump is controlled to evacuate the baking chamber; The baking chamber is filled with inert gas to the first vacuum level to perform the preheating process.

3. The cell baking method according to claim 1, characterized in that, The preheating process includes: The baking chamber is preheated to a preset temperature and maintained for a first preset duration; The vacuum pump is controlled to evacuate the baking chamber and inert gas is introduced into the baking chamber to the first vacuum level.

4. The cell baking method according to claim 1, characterized in that, The drying operation of the test cell according to the vacuum value of the baking chamber as the second vacuum level includes: The vacuum pump is controlled to evacuate the baking chamber until the vacuum value of the baking chamber is the second vacuum value; Maintain the vacuum value within the baking chamber unchanged and continue heating for a second preset time; The inert gas in the baking chamber is replaced to bring the vacuum level in the baking chamber to the first vacuum level.

5. The cell baking method according to claim 1, characterized in that, After drying the test cell according to the second vacuum level of the baking chamber, the process further includes: The drying operation is performed at least m times, where m is a positive integer greater than or equal to 2.

6. The cell baking method according to claim 1, characterized in that, After drying the test cell according to the second vacuum level of the baking chamber, the process further includes: The baking chamber is controlled to maintain the second vacuum level for a time that meets the fourth preset duration.

7. A battery cell baking device, characterized in that, It includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the cell baking method according to any one of claims 1 to 6.

8. The cell baking equipment according to claim 7, characterized in that, Also includes: At least one vacuum pump and multiple baking chambers; One of the vacuum pumps is connected to at least two of the baking chambers.

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