Drying device and battery cell production line

Abstract

The utility model relates to battery technical field discloses drying device and electric core production line, drying device includes: drying assembly and detection component, drying assembly has drying cavity, detection component includes measurement gas chamber, input optical fiber, output optical fiber and control unit, measurement gas chamber has measurement cavity, input optical fiber and output optical fiber are connected with measurement gas chamber respectively and communicate with measurement cavity, input optical fiber and output optical fiber are connected with control unit respectively, the utility model installs measurement gas chamber in drying cavity, and makes measurement cavity and drying cavity direct intercommunication, and control unit can respectively introduce and output light beam in measurement cavity through input optical fiber and output optical fiber, and the change of light beam is detected through control unit, and the state parameter in current drying cavity can be reacted, and then can real -time obtain the water content in drying cavity, can realize the real -time monitoring of water content to the electric core baking process, not only the detection speed is faster, and the result measured is also more accurate.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a drying device and a battery cell production line. Background Technology

[0002] As the capacity and size of battery cells continue to increase, the drying time in the corresponding drying process also increases significantly. In the battery cell drying process, an oven is typically used to heat the cells. To prevent over- or under-drying from affecting the reliability of subsequently manufactured batteries, it is necessary to monitor the degree of drying of the cells.

[0003] Currently, in the existing battery cell baking process, operators typically use the Karl Fischer method to manually test the water content of the battery cells after baking. This testing process is not only time-consuming and labor-intensive, but also prone to deviations in test results due to differences in the testing techniques of the operators. Therefore, the existing battery cell drying test method suffers from poor testing reliability. Utility Model Content

[0004] In view of this, the present invention provides a drying device and a battery cell production line to solve the problem of poor detection reliability in existing battery cell drying and testing methods.

[0005] In a first aspect, this utility model provides a drying device, comprising: a drying component and a detection component; the drying component having a drying chamber for placing battery cells; the detection component including a measuring chamber, an input optical fiber, an output optical fiber, and a control unit; the measuring chamber is disposed in the drying chamber and has a measuring cavity, the measuring cavity being connected to the drying chamber and having a reflective surface on its inner wall; the input optical fiber and the output optical fiber are respectively connected to the measuring chamber and connected to the measuring cavity, the input optical fiber and the output optical fiber passing through the drying chamber and respectively connected to the control unit; the control unit can input a light beam into the measuring cavity through the input optical fiber, and the control unit can receive the light beam reflected multiple times by the reflective surface through the output optical fiber, thereby detecting the water content in the drying chamber.

[0006] Beneficial effects: The measuring chamber is installed in the drying chamber and directly connected to it. The control unit can introduce and output light beams into the measuring chamber through input and output optical fibers, respectively. By detecting changes in the light beams, the control unit can reflect the current state parameters in the drying chamber, thereby enabling real-time acquisition of the water content in the drying chamber. This allows for real-time monitoring of the water content during the battery cell baking process. Compared to manual measurement by operators, the drying device in this embodiment not only has a faster detection speed but also provides more accurate results, effectively solving the problem of poor detection reliability in existing battery cell drying test methods.

[0007] In one optional embodiment, the drying device further includes a sealing component, the outer wall of which is provided with a through hole communicating with the drying chamber, the sealing component being sealed to the through hole, and the input optical fiber and the output optical fiber being connected to the control unit through the sealing component.

[0008] Beneficial effects: The sealing components can effectively improve the sealing reliability at the through holes, preventing heat loss caused by the drying chamber being connected to the outside.

[0009] In one optional embodiment, the sealing assembly includes a sealing cylinder, a first transition structure, and a second transition structure. The sealing cylinder is disposed around the through hole on the outer wall of the drying assembly, and the sealing cylinder is sealed to the drying assembly. The interior of the sealing cylinder has a transition cavity communicating with the through hole. The first and second adapter structures are respectively sealed and connected to the sealing cylinder. The input optical fiber and the output optical fiber pass through the through hole and enter the adapter cavity. The input optical fiber is connected to the control unit through the first adapter structure, and the output optical fiber is connected to the control unit through the second adapter structure.

[0010] Beneficial effects: The sealing component has a simple and reliable structure. It can support both the first and second transition structures with a single sealing cylinder, and the sealing requirements of the input and output optical fibers can be met with a single sealing component.

[0011] In one alternative embodiment, a first connecting flange is provided at one end of the sealing cylinder near the drying assembly, and a first mating flange is provided around the through hole on the outer wall of the drying assembly. The first connecting flange and the first mating flange are detachably connected by a first clamp.

[0012] Beneficial effects: The sealing cylinder and the drying component are detachably connected. When maintenance is required, the sealing component can be removed entirely by unlocking the first clamp. In addition, during assembly, the sealing component can be assembled and then installed as a whole on the drying component, which can effectively improve the assembly flexibility of the sealing component.

[0013] In one optional embodiment, the sealing cylinder includes a first cylinder section and a second cylinder section. The first cylinder section extends axially along the through hole and is connected to the outer wall of the drying assembly. The second cylinder section is disposed on the outer peripheral surface of the first cylinder section, and the inner cavity of the first cylinder section and the inner cavity of the second cylinder section together form a transition cavity. The first transition structure is connected to the first cylinder section, and the second transition structure is connected to the second cylinder section.

[0014] Beneficial effects: This type of sealing cylinder can be installed on both the first and second adapter structures simultaneously, which not only ensures the sealing effect but also avoids interference during the installation or disassembly of the first and second adapter structures, allowing the first and second adapter structures to be installed or disassembled independently.

[0015] In one optional embodiment, the first adapter structure includes a first adapter and a first connecting plate. The first adapter is fixedly inserted in the first connecting plate and is used to connect to the input optical fiber. A second connecting flange is provided at the end of the first cylinder section away from the outer wall of the drying assembly. The first connecting plate and the second connecting flange are detachably connected by a second clamp. The second adapter structure includes a second adapter and a second connecting plate. The second adapter is fixedly installed in the second connecting plate and is used to connect to the output optical fiber. A third connecting flange is provided at the end of the second tube segment away from the first tube segment. The second connecting plate and the third connecting flange are detachably connected by a third clamp.

[0016] Beneficial effects: The connection between the first and second transition structures is simple and reliable. The clamp connection can effectively clamp the flange and the connecting plate, ensuring a tight fit between the flange and the connecting plate and guaranteeing the sealing reliability of the connection position.

[0017] In one optional embodiment, the input optical fiber includes a first input segment and a second input segment. The measuring gas chamber is connected to one end of a first adapter through the first input segment, and the other end of the first adapter is connected to a control unit through the second input segment. And / or, the output optical fiber includes a first output segment and a second output segment, the measuring gas chamber is connected to one end of the second adapter through the first output segment, and the other end of the second adapter is connected to the control unit through the second output segment.

[0018] Beneficial effects: The external optical fiber can reliably transmit the light beam to the internal optical fiber through the adapter. Compared with the optical fiber being directly installed on the outer wall of the drying component, this can effectively improve the sealing reliability and greatly reduce the possibility of sealing failure.

[0019] In one optional embodiment, the drying assembly further includes an air extraction structure, and an air extraction hole is provided on the inner wall of the drying chamber for communicating with the air extraction structure. There is one measuring chamber, which is connected to the inner wall of the drying chamber and located on one side of the air extraction hole.

[0020] Beneficial effects: Since a vacuuming step needs to be performed simultaneously when heating the drying chamber, this arrangement of measuring chambers can not only reduce the number of measuring chambers, but also make the data measured by the measuring chambers more efficient and accurate.

[0021] In one optional embodiment, there are multiple measuring chambers, all of which are connected to the same control unit, and the multiple measuring chambers are spaced apart on the inner wall of the drying chamber.

[0022] Beneficial effects: This arrangement of measuring chambers allows for more comprehensive monitoring of the state at different locations within the drying chamber, improving the accuracy and reliability of measurements.

[0023] Secondly, this utility model also provides a battery cell production line, which includes the aforementioned drying device. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a simplified structural diagram of a drying device according to an embodiment of the present utility model; Figure 2 for Figure 1 A three-dimensional schematic diagram of the measuring gas chamber of the drying device shown; Figure 3 for Figure 1 A cross-sectional schematic diagram of the detection and sealing components of the drying device shown; Figure 4 for Figure 1 The schematic diagram of the detection component of the drying device shown is shown. Figure 5 for Figure 1 The diagram shows the connection of the drying device.

[0026] Explanation of reference numerals in the attached figures: 1. Drying assembly; 101. Drying chamber; 102. Through hole; 103. Fitting flange; 2. Detection components; 201. Measuring gas chamber; 2011. Measuring cavity; 202. Input optical fiber; 2021. First input segment; 2022. Second input segment; 203. Output optical fiber; 2031. First output segment; 2032. Second output segment; 204. Control unit; 3. Sealing assembly; 301. Sealing cylinder; 3011. First connecting flange; 3012. First cylinder section; 3013. Second cylinder section; 3014. Second connecting flange; 3015. Third connecting flange; 302, First adapter structure; 3021, First adapter; 3022, First connecting plate; 303, Second adapter structure; 3031, Second adapter; 3032, Second connecting plate; 4. First clamp; 5. Second clamp; 6. Third clamp; 7. Communication cable; 8. PLC; 9. Host computer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] Currently, in related technologies, when manually testing the water content of battery cells after baking, it is necessary to destructively disassemble the battery cells and cut off the electrode sheets, which will cause a certain amount of battery cells to be scrapped, affecting production. In addition, due to different batches of incoming materials and the lack of baking process management methods, when using the same baking parameters to bake different batches of materials, over-baking or under-baking will still occur, which will lead to low initial charge and discharge efficiency, low cycle life, and poor interface of the battery cells in that batch.

[0029] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0030] According to an embodiment of the present invention, a drying device is provided, comprising: a drying component 1 and a detection component 2; The drying assembly 1 has a drying chamber 101 for placing the battery cells; The detection component 2 includes a measuring air chamber 201, an input optical fiber 202, an output optical fiber 203, and a control unit 204; the measuring air chamber 201 is disposed in the drying chamber 101 and has a measuring cavity 2011, the measuring cavity 2011 is connected to the drying chamber 101 and has a reflective surface on its inner wall; The input optical fiber 202 and the output optical fiber 203 are respectively connected to the measuring air chamber 201 and communicate with the measuring cavity 2011. The input optical fiber 202 and the output optical fiber 203 pass through the drying cavity 101 and are respectively connected to the control unit 204. The control unit 204 can input a light beam into the measuring cavity 2011 through the input optical fiber 202, and the control unit 204 can receive the light beam that has been reflected multiple times by the reflective surface through the output optical fiber 203, thereby detecting the water content in the drying cavity 101.

[0031] In the drying device of this embodiment, the measuring chamber 201 is installed in the drying chamber 101, and the measuring chamber 2011 is directly connected to the drying chamber 101. The control unit 204 can introduce and output light beams into the measuring chamber 2011 through the input optical fiber 202 and the output optical fiber 203, respectively. By detecting the change of the light beam, the control unit 204 can reflect the current state parameters in the drying chamber 101, and thus obtain the water content in the drying chamber 101 in real time. This enables real-time monitoring of the water content during the cell baking process. Compared with manual measurement by operators, the drying device of this embodiment not only has a faster detection speed, but also obtains more accurate results, effectively solving the problem of poor detection reliability in existing cell drying test methods.

[0032] Specifically, the control unit 204 can communicate with the PLC8 via the communication line 7. After the PLC8 is connected to the host computer 9, the host computer 9 can display the temperature, pressure and data collected by the measuring air chamber 201 in the drying chamber 101 in real time, and can represent them through curves to realize real-time monitoring and data visualization.

[0033] Furthermore, such as Figure 1 As shown, the drying device also includes a baking clamp, which is used to load the battery cells and heat the drying chamber 101. The baking clamp, which is full of battery cells, can be sent into the drying chamber 101 by RGV or forklift. During the baking process, the drying chamber 101 is heated by electricity through the heating film on the baking clamp.

[0034] In addition, such as Figure 4 As shown, the form of the components inside the control unit 204 is not limited. The control unit 204 includes modules such as a drive circuit, a diode laser generator, a detector, a lock-in amplifier, and a signal output module, which are used to generate a light beam and process and analyze the received light beam.

[0035] The measuring chamber 201 is typically made of a high-transmittance material, such as quartz, sapphire, or infrared optical glass, to ensure that the laser beam can pass through effectively.

[0036] In one possible implementation, such as Figure 3 As shown, the drying device also includes a sealing component 3. The outer wall of the drying component 1 is provided with a through hole 102 that communicates with the drying chamber 101. The sealing component 3 is sealed to the through hole 102. The input optical fiber 202 and the output optical fiber 203 are connected to the control unit 204 through the sealing component 3. The sealing component 3 can effectively improve the sealing reliability at the through hole 102 and prevent the drying chamber 101 from communicating with the outside world, thus preventing heat loss.

[0037] It is understood that, as an alternative implementation, the through hole 102 may not be provided. The outer wall of the drying assembly 1 is provided with an adapter that penetrates into the drying chamber 101. The external input optical fiber 202 is connected to the input optical fiber 202 in the drying chamber 101 through the adapter, and the external output optical fiber 203 is connected to the output optical fiber 203 in the drying chamber 101 through the adapter, so as to avoid the sealing problem caused by the perforation.

[0038] In one possible implementation, such as Figure 3 As shown, the sealing assembly 3 includes a sealing cylinder 301, a first transition structure 302 and a second transition structure 303. The sealing cylinder 301 is disposed around the through hole 102 on the outer wall of the drying assembly 1. The sealing cylinder 301 is sealed to the drying assembly 1. The interior of the sealing cylinder 301 has a transition cavity that communicates with the through hole 102. The first adapter structure 302 and the second adapter structure 303 are respectively sealed and connected to the sealing cylinder 301. The input optical fiber 202 and the output optical fiber 203 pass through the through hole 102 and enter the adapter cavity. The input optical fiber 202 is connected to the control unit 204 through the first adapter structure 302, and the output optical fiber 203 is connected to the control unit 204 through the second adapter structure 303.

[0039] The sealing component 3 has a simple and reliable structure. The first adapter structure 302 and the second adapter structure 303 can be supported by a single sealing cylinder 301. The sealing requirements of the input optical fiber 202 and the output optical fiber 203 can be met by using a single sealing component 3.

[0040] It is understood that, as an alternative implementation, the sealing component 3 may also be a sealing plug disposed in the through hole 102, with the input optical fiber 202 and the output optical fiber 203 passing through the hole of the sealing plug and being squeezed and sealed by the sealing plug.

[0041] In one possible implementation, such as Figure 3 As shown, the sealing cylinder 301 has a first connecting flange 3011 at one end near the drying assembly 1, and a first mating flange 103 is provided around the through hole 102 on the outer wall of the drying assembly 1. The first connecting flange 3011 and the first mating flange 103 are detachably connected by a first clamp 4. The sealing cylinder 301 is detachably connected to the drying assembly 1. When maintenance is required, the sealing assembly 3 can be completely removed by unlocking the first clamp 4. In addition, during assembly, the sealing assembly 3 can also be assembled and then installed as a whole on the drying assembly 1, which can effectively improve the assembly flexibility of the sealing assembly 3.

[0042] It is understood that, as an alternative implementation, a sealing gasket can be placed between the sealing cylinder 301 and the outer wall of the drying component 1, and the two can be detachably connected by connecting bolts or other connecting components. Alternatively, the sealing cylinder 301 and the outer wall of the drying component 1 can be directly fixedly connected by welding or other connection methods, as long as the sealing effect can be guaranteed.

[0043] In one possible implementation, such as Figure 3 As shown, the sealing cylinder 301 includes a first cylinder section 3012 and a second cylinder section 3013. The first cylinder section 3012 extends axially along the through hole 102 and is connected to the outer wall of the drying assembly 1. The second cylinder section 3013 is disposed on the outer peripheral surface of the first cylinder section 3012, and the inner cavity of the first cylinder section 3012 and the inner cavity of the second cylinder section 3013 together form a transition cavity. The first transition structure 302 is connected to the first cylindrical section 3012, and the second transition structure 303 is connected to the second cylindrical section 3013.

[0044] This type of sealing cylinder 301 can be installed on both the first adapter structure 302 and the second adapter structure 303 simultaneously. This ensures a good sealing effect while preventing interference during the installation or removal of the first adapter structure 302 and the second adapter structure 303. It also allows the first adapter structure 302 and the second adapter structure 303 to be installed or removed independently.

[0045] It is understood that, as an alternative implementation, the second cylindrical section 3013 may not be provided, and the first transition structure 302 and the second transition structure 303 may be installed on the first cylindrical section 3012 at the same time.

[0046] In one possible implementation, such as Figure 3 As shown, the first adapter structure 302 includes a first adapter 3021 and a first connecting plate 3022. The first adapter 3021 is fixedly inserted into the first connecting plate 3022 and is used to connect to the input optical fiber 202. The first cylindrical section 3012 is provided with a second connecting flange 3014 at one end away from the outer wall of the drying assembly 1. The first connecting plate 3022 and the second connecting flange 3014 are detachably connected by a second clamp 5. The second adapter structure 303 includes a second adapter 3031 and a second connecting plate 3032. The second adapter 3031 is fixedly inserted into the second connecting plate 3032 and is used to connect with the output optical fiber 203. The end of the second cylindrical section 3013 away from the first cylindrical section 3012 is provided with a third connecting flange 3015. The second connecting plate 3032 and the third connecting flange 3015 are detachably connected by a third clamp 6.

[0047] The connection between the first transition structure 302 and the second transition structure 303 is simple and reliable. The connection method using clamps can effectively clamp the flange and the connecting plate, ensuring a tight fit between the flange and the connecting plate and guaranteeing the sealing reliability of the connection position.

[0048] It is understandable that, as an alternative implementation, a sealing gasket can be placed between the flange and the connecting plate, and the two can be detachably connected by connecting bolts or other connecting components, as long as the sealing effect can be guaranteed.

[0049] In one possible implementation, such as Figure 3 and Figure 5 As shown, the input optical fiber 202 includes a first input segment 2021 and a second input segment 2022. The measuring gas chamber 201 is connected to one end of the first adapter 3021 through the first input segment 2021, and the other end of the first adapter 3021 is connected to the control unit 204 through the second input segment 2022. And / or, the output fiber optic cable 203 includes a first output segment 2031 and a second output segment 2032. The measuring gas chamber 201 is connected to one end of the second adapter 3031 through the first output segment 2031, and the other end of the second adapter 3031 is connected to the control unit 204 through the second output segment 2032.

[0050] The external optical fiber can reliably transmit the light beam to the internal optical fiber through the adapter. Compared with the optical fiber being directly installed on the outer wall of the drying component 1, this can effectively improve the sealing reliability and greatly reduce the possibility of sealing failure.

[0051] like Figure 3 As shown, the first connecting plate 3022 has a mounting hole, and the first adapter 3021 passes through the mounting hole and is welded and fixed to the first connecting plate 3022. The first adapter structure 302 formed by this assembly method is stable and reliable. It can solve the problem that the conventional first adapter 3021 cannot be assembled with the sealing cylinder 301, and at the same time, it can ensure its own sealing reliability. The second adapter structure 303 is similar in form to the first adapter structure 302, and will not be described in detail here.

[0052] In one possible implementation, the drying assembly 1 further includes an air extraction structure, and an air extraction hole is provided on the inner wall of the drying chamber 101 for communicating with the air extraction structure. There is one measuring chamber 201. The measuring chamber 201 is connected to the inner wall of the drying chamber 101 and is located on one side of the air extraction hole. Since the drying chamber 101 needs to be heated simultaneously with the vacuuming process, this arrangement of the measuring chamber 201 can not only reduce the number of measuring chambers 201, but also make the data measured by the measuring chamber 201 more efficient and accurate.

[0053] Specifically, the air extraction structure is a vacuum pump, which extracts air and moisture from the drying chamber 101 to create a vacuum state inside the drying chamber 101, which can lower the boiling point of water and accelerate the drying speed.

[0054] The vaporization temperature of water is positively correlated with saturated vapor pressure and negatively correlated with vacuum level. The lower the saturated vapor pressure, the lower the vaporization temperature of water. Similarly, the higher the vacuum level, the lower the vaporization temperature of water. Water vaporizes more easily at low temperatures in a vacuum environment. When the temperature is kept at a certain value, increasing the vacuum level in the drying chamber can convert more moisture on the surface of the material into water vapor, which can also accelerate the drying process.

[0055] In one possible implementation, there are multiple measuring chambers 201, all of which are connected to the same control unit 204. The multiple measuring chambers 201 are spaced apart on the inner wall of the drying chamber 101. This arrangement of measuring chambers 201 can more comprehensively monitor the status of different positions in the drying chamber 101, thereby improving the accuracy and reliability of the measurement.

[0056] The aforementioned light beam is a laser. The following describes the moisture content detection method of the drying apparatus in this embodiment: According to molecular spectroscopy theory, the motion within a molecule can be divided into three forms, each corresponding to a different quantized energy level: the motion of electrons relative to the atomic nucleus corresponds to the electronic energy level; the continuous vibration of the atomic nucleus corresponds to the vibrational energy level; and the rotation of the molecule around its center of gravity corresponds to the rotational energy level. These three energy levels constitute the structure of the quantized molecular energy levels. These three types of motion within the molecule are not independent but rather mutually influential and constraining.

[0057] Molecular spectroscopy is formed by the absorption or emission of photons during transitions between energy levels of molecules. When a molecule transitions from its ground state to an excited state, it absorbs light energy from its surroundings. Recording the intensity of the absorbed radiation in order of wavelength yields the absorption spectrum. According to the condition for a transition, the absorbed energy must be exactly the energy difference between the two energy levels. Therefore, only photons that satisfy the energy level transition condition will be absorbed by gas molecules. Since gases with different structures have different energy levels, they absorb photons of different frequencies, forming the principle of gas spectral absorption detection.

[0058] TDLAS (Tunable Spectrophotometry) is an infrared absorption spectroscopy technique that utilizes the principle of frequency-selective absorption to generate an absorption spectrum, enabling high-resolution quantitative analysis of molecular concentrations. It allows for in-situ, non-contact measurement and features high precision and high selectivity.

[0059] The semiconductor laser source used has a spectral width much smaller than the broadening of the gas absorption spectral line, resulting in a single-line absorption spectrum. Therefore, TDLAS technology is a high-resolution absorption spectroscopy technique. When selecting this absorption line, it should be ensured that there are no absorption lines of background gas components in the measurement environment within approximately 10 times the linewidth of the selected absorption line frequency. This avoids interference from these background gas components on the measured gas and ensures measurement accuracy.

[0060] The calculation of water content utilizes the Lambert-Beer Law, which describes the relationship between light transmittance and the absorptivity of the medium, the thickness of the medium, and the concentration of the medium. The specific formula can be expressed as:

[0061] in: It: Light intensity after passing through the medium; I0: Initial intensity of incident light; α: Absorption coefficient, which is a measure of a substance's ability to absorb light at a specific wavelength; c: Concentration of the medium; L: The path length of light through the medium.

[0062] The concentration of water vapor to be measured is determined by detecting changes in laser light intensity.

[0063] Since the two PPMs are not the same definition—one is a volume ratio and the other is a mass ratio—a process model or experimental calibration is needed to establish a relationship between them.

[0064] Step 1: Convert gas PPMV to absolute humidity (mass concentration); According to the ideal gas law, the mass concentration (μg / m3) of water vapor in the gas is:

[0065] P: Total gas pressure (Pa); MH20: Molar mass of water (18 g / mol); R: gas constant (8.314 J / (mol·K)); T: Gas temperature (K); R: gas constant (J / (mol·K) matches E in J / mol); Step 2: Correlate residual moisture in the electrode with the humidity of the cavity; The residual moisture content (PPMw) of the electrode depends on: the water vapor concentration (PPMV) in the baking chamber, the baking temperature, time, gas flow rate, and the hygroscopic properties of the electrode material.

[0066] The following empirical formula can be established through experiments:

[0067] k: Process constant (related to materials and airflow); t: Baking time; E: Electrode dehydration activation energy; T: Baking temperature.

[0068] Example: Baking conditions assumed: cavity water vapor concentration: 10 PPMv (25°C, atmospheric pressure); Baking time: 2 hours; Experimental calibration coefficient k = 0.05 PPMw / (PPMV) h); The residual moisture on the electrode is: PPMw = 0.05 × 10 × 2 = 1 PPMw.

[0069] According to an embodiment of the present invention, another aspect provides a battery cell production line, which includes the drying device described above.

[0070] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A drying apparatus, characterized in that, include: Drying component (1) and detection component (2); The drying assembly (1) has a drying chamber (101) for placing the battery cells. The detection component (2) includes a measuring gas chamber (201), an input optical fiber (202), an output optical fiber (203), and a control unit (204). The measuring chamber (201) is disposed in the drying chamber (101) and has a measuring chamber (2011). The measuring chamber (2011) is connected to the drying chamber (101) and has a reflective surface on its inner wall. The input optical fiber (202) and the output optical fiber (203) are respectively connected to the measuring air chamber (201) and communicate with the measuring cavity (2011). The input optical fiber (202) and the output optical fiber (203) pass through the drying cavity (101) and are respectively connected to the control unit (204). The control unit (204) can input a light beam into the measuring cavity (2011) through the input optical fiber (202), and the control unit (204) can receive the light beam that has been reflected multiple times by the reflective surface through the output optical fiber (203), thereby detecting the water content in the drying cavity (101).

2. The drying apparatus according to claim 1, characterized in that, The drying device further includes a sealing component (3). The outer wall of the drying component (1) is provided with a through hole (102) communicating with the drying chamber (101). The sealing component (3) is sealed to the through hole (102). The input optical fiber (202) and the output optical fiber (203) are connected to the control unit (204) through the sealing component (3).

3. The drying apparatus according to claim 2, characterized in that, The sealing assembly (3) includes a sealing cylinder (301), a first transition structure (302), and a second transition structure (303). The sealing cylinder (301) is disposed on the outer wall of the drying assembly (1) around the through hole (102). The sealing cylinder (301) is sealed to the drying assembly (1). The interior of the sealing cylinder (301) has a transition cavity communicating with the through hole (102). The first adapter structure (302) and the second adapter structure (303) are respectively sealed and connected to the sealing cylinder (301). The input optical fiber (202) and the output optical fiber (203) pass through the through hole (102) and enter the adapter cavity. The input optical fiber (202) is connected to the control unit (204) through the first adapter structure (302), and the output optical fiber (203) is connected to the control unit (204) through the second adapter structure (303).

4. The drying apparatus according to claim 3, characterized in that, The sealing cylinder (301) is provided with a first connecting flange (3011) at one end near the drying assembly (1), and the outer wall of the drying assembly (1) is provided with a first mating flange (103) around the through hole (102). The first connecting flange (3011) and the first mating flange (103) are detachably connected by a first clamp (4).

5. The drying apparatus according to claim 3, characterized in that, The sealing cylinder (301) includes a first cylinder section (3012) and a second cylinder section (3013). The first cylinder section (3012) extends axially along the through hole (102) and is connected to the outer wall of the drying assembly (1). The second cylinder section (3013) is disposed on the outer peripheral surface of the first cylinder section (3012). The inner cavity of the first cylinder section (3012) and the inner cavity of the second cylinder section (3013) together form the transition cavity. The first adapter structure (302) is connected to the first cylindrical section (3012), and the second adapter structure (303) is connected to the second cylindrical section (3013).

6. The drying apparatus according to claim 5, characterized in that, The first adapter structure (302) includes a first adapter (3021) and a first connecting plate (3022). The first adapter (3021) is fixedly installed in the first connecting plate (3022) and is used to connect with the input optical fiber (202). A second connecting flange (3014) is provided at one end of the first cylindrical section (3012) away from the outer wall of the drying assembly (1). The first connecting plate (3022) and the second connecting flange (3014) are detachably connected by a second clamp (5). The second adapter structure (303) includes a second adapter (3031) and a second connecting plate (3032). The second adapter (3031) is fixedly installed in the second connecting plate (3032) and is used to connect with the output optical fiber (203). The end of the second tube segment (3013) away from the first tube segment (3012) is provided with a third connecting flange (3015). The second connecting plate (3032) and the third connecting flange (3015) are detachably connected by a third clamp (6).

7. The drying apparatus according to claim 6, characterized in that, The input optical fiber (202) includes a first input segment (2021) and a second input segment (2022). The measuring gas chamber (201) is connected to one end of the first adapter (3021) through the first input segment (2021), and the other end of the first adapter (3021) is connected to the control unit (204) through the second input segment (2022). And / or, the output optical fiber (203) includes a first output segment (2031) and a second output segment (2032), the measuring gas chamber (201) is connected to one end of the second adapter (3031) through the first output segment (2031), and the other end of the second adapter (3031) is connected to the control unit (204) through the second output segment (2032).

8. The drying apparatus according to any one of claims 1 to 7, characterized in that, The drying assembly (1) further includes an air extraction structure, and an air extraction hole is provided on the inner wall of the drying chamber (101), which is used to communicate with the air extraction structure. The number of the measuring air chamber (201) is one. The measuring air chamber (201) is connected to the inner wall of the drying chamber (101) and is located on one side of the air extraction hole.

9. The drying apparatus according to any one of claims 1 to 7, characterized in that, The number of the measuring air chambers (201) is multiple and all are connected to the same control unit (204). The multiple measuring air chambers (201) are spaced apart on the inner wall of the drying chamber (101).

10. A battery cell production line, characterized in that, include: The drying apparatus according to any one of claims 1 to 9.

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