Battery cell baking device

Abstract

The utility model relates to the technical field of battery cell processing equipment, in particular to a battery cell baking device. The utility model discloses a battery cell baking device which comprises a baking box, an inert gas heating assembly, a vacuumizing assembly and a gas conveying piece, the baking box is used for placing and baking a battery cell; the inert gas heating assembly comprises an inert gas conveying channel and a heating element, and the heating element is used for heating inert gas in the inert gas conveying channel to a set temperature; the vacuum pumping assembly is connected with the baking box and used for conducting vacuum pumping on the baking box. According to the battery cell baking device, the temperature rise time of the battery cell can be shortened, the preheating efficiency, the baking effect and the baking efficiency of the battery cell are improved, and the baking energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric core processing equipment, in particular to an electric core baking device. BACKGROUND

[0002] Lithium ion battery as a kind of high-performance power supply device, with its light, high energy density, long cycle life etc. Characteristics, in mobile communication, electric vehicle, energy storage equipment etc. Field has been widely applied. In the production process of lithium battery, baking process is a vital link. The main purpose of this step is to reduce the water content in the electric core, to improve the overall performance of electric core.

[0003] The moisture in the electric core will react with electrolyte, produce harmful substances, affect the stability and service life of battery. Therefore, in the production process of electric core, electric core needs to be baked to remove excess moisture. In the baking process, electric core will be treated for a long time under certain temperature and humidity conditions to ensure that moisture is fully evaporated.

[0004] Through baking, the water content of electric core can be effectively controlled, thereby reducing the internal resistance of battery and improving the charge-discharge performance of battery. In addition, reducing water content can also reduce the swelling phenomenon that may occur during the cycle of battery, improve the safety and reliability of battery. In the implementation process of baking process, baking temperature and time need to be strictly controlled to avoid high temperature causing damage to electric core materials and affecting battery performance.

[0005] The current battery core baking is heated / contact type heating baking by using hot air circulation heating system, and the heating efficiency is low, the heating time is long, the energy consumption is large during the baking process, and the baking efficiency is low. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an electric core baking device to shorten baking time and improve baking efficiency.

[0007] To solve the above technical problems, the utility model provides an electric core baking device.

[0008] The electric core baking device of the utility model comprises:

[0009] An oven is used for placing electric core and baking in the oven;

[0010] An inert gas heating assembly comprises an inert gas delivery channel and a heating element, one end of the inert gas delivery channel is connected with an inert gas source, the other end is connected with the oven, a valve for controlling the on-off of the inert gas delivery channel is arranged on the inert gas delivery channel, and the heating element is used for heating the inert gas in the inert gas delivery channel to a set temperature;

[0011] A vacuumizing assembly is connected to the baking oven for vacuumizing the baking oven;

[0012] A gas conveying member is used for introducing inert gas in the inert gas conveying passage into the baking oven, so that the pressure in the baking oven is positive pressure.

[0013] Further, the heating element is a heating resistance wire.

[0014] Further, the baking oven comprises a box body and a positive pressure resistant door arranged on the box body, and the positive pressure resistant door and the box body are sealed by a sealing member.

[0015] Further, a positive pressure resistant observation window is arranged on the positive pressure resistant door.

[0016] Further, one side of the positive pressure resistant door is hinged to the box body by a hinge, and the other side is detachably fixedly connected to the box body by a bolt.

[0017] Further, the sealing member is an annular sealing strip.

[0018] Further, the vacuumizing assembly comprises a vacuum pump and an air exhaust pipeline, one end of the air exhaust pipeline is connected to the baking oven, and the other end is connected to the vacuum pump.

[0019] Further, the gas conveying member is a blower.

[0020] Further, the baking oven is provided with a clamp for clamping the battery cell.

[0021] Further, the clamp has a plurality of clamping cavities enclosed by a plurality of heat-conducting plates, and the size of the clamping cavities is matched with the size of the battery cell.

[0022] Compared with the prior art, the utility model has at least the following beneficial effects:

[0023] The utility model discloses a battery core baking device, through heating element, inert gas is heated to the set temperature, through the advance preheating of inert gas, like this inert gas enters and will not consume the heat of battery core itself, like this, the battery core will not lose temperature because of the addition of inert gas, will not affect the baking efficiency because of the addition of inert gas, to realize the even heating of battery core, the vacuumizing component is used to the vacuumizing of baking oven to negative pressure before or during baking, removes the moisture and impurity in the inside, improves the baking effect, after the vacuumizing is completed, gas delivery spare transports the inert gas of heating to the set temperature to the baking oven and makes the pressure in the baking oven be positive pressure, to destroy the water balance of battery core, compared with the prior art in the vacuumizing, the pressure in the baking oven is maintained at negative pressure after the inert gas is passed in, the application passes in the heated inert gas after the vacuumizing, and the pressure in the baking oven is maintained at positive pressure, more beneficial to the moisture volatilization from the chip, to improve the baking efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is structural schematic diagram of one embodiment of the battery core baking device of the utility model;

[0025] Figure 2 It is structural schematic diagram of another view of the battery core baking device in Figure 1 .

[0026] Reference signs:

[0027] 10, baking oven; 11, box body; 12, positive pressure resistant door; 13, positive pressure resistant observation window; 21, inert gas delivery channel; 30, air blower; 41, air extraction pipeline. DETAILED DESCRIPTION

[0028] The battery core baking device of the utility model will be described below in conjunction with the schematic diagram, wherein the preferred embodiment of the utility model is shown, and it should be understood that the utility model described herein can be modified by the person skilled in the art, and the advantageous effects of the utility model are still achieved. Therefore, the following description should be understood as extensive knowledge for the person skilled in the art, and not as a limitation on the utility model.

[0029] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "electrical connection" can be a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0032] The present invention will be described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0033] The following is in conjunction with the instruction manual appendix. Figure 1 and attached Figure 2 This paper introduces the battery cell baking device of this utility model.

[0034] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery cell baking apparatus of this application includes a baking oven 10, an inert gas heating component, a vacuuming component, and a gas conveying component.

[0035] The baking oven 10 is used for placing the battery cell and baking. The inert gas heating assembly comprises an inert gas delivery channel 21 and a heating element. One end of the inert gas delivery channel 21 is connected with an inert gas source, and the other end is connected with the baking oven 10. The inert gas delivery channel 21 is provided with a valve for controlling the on-off of the inert gas delivery channel 21. The heating element is used for heating the inert gas in the inert gas delivery channel 21 to a set temperature. The vacuum pumping assembly is connected with the baking oven 10 and is used for pumping the baking oven 10 to a negative pressure. The gas delivery member is used for introducing the inert gas in the inert gas delivery channel 21 into the baking oven 10, so that the pressure in the baking oven 10 is a positive pressure.

[0036] Further, the inert gas can be nitrogen, argon or helium, or other inert gas. The set temperature refers to the same temperature as the baking temperature of the battery cell, so that the inert gas will not consume the heat of the battery cell itself after being heated to the set temperature and entering the baking oven 10. The vacuum pump in the vacuum pumping assembly can be a rotary vane vacuum pump, which is used for pumping the baking oven 10.

[0037] Specifically, the baking oven 10 provides a closed environment for placing the battery cell and baking. The inert gas heating assembly delivers the inert gas from the source end to the baking oven 10 through the inert gas delivery channel 21, and heats the inert gas to a set temperature through the heating element. By preheating the inert gas in advance, the inert gas will not consume the heat of the battery cell itself after entering, so that the battery cell will not lose temperature due to the addition of the inert gas, and the baking efficiency will not be affected due to the addition of the inert gas, thereby achieving uniform heating of the battery cell. The valve can control the on-off of the inert gas, ensuring accurate control of the baking process. The vacuum pumping assembly is used for pumping the baking oven 10 to a negative pressure, such as -0.95 MPa, before or during baking, to remove internal moisture and impurities and improve baking efficiency. After the vacuum pumping is completed, the gas delivery member delivers the inert gas heated to the set temperature to the baking oven 10 and makes the pressure in the baking oven 10 a positive pressure, such as 0.2 MPa, and of course other positive pressure values, thereby breaking the water balance of the battery cell. Compared with the prior art, after pumping, the inert gas is introduced to maintain the pressure in the baking oven 10 at a negative pressure, such as 0.6 MPa. In the present application, after pumping, the heated inert gas is introduced to maintain the pressure in the baking oven 10 at a positive pressure, which is more conducive to the evaporation of moisture from the chip, thereby improving the baking efficiency.

[0038] Therefore, the battery cell baking device of the present application can effectively improve the heating efficiency, shorten the heating time, reduce the energy consumption, and improve the baking efficiency, thereby solving the technical problems of low heating efficiency, long heating time, high energy consumption and low baking efficiency in the battery cell baking process.

[0039] In one of the embodiments, the heating element is a heating resistance wire.

[0040] Specifically, the heating resistance wire is a preferred heating element, which works by heating the inert gas in the inert gas delivery channel 21 through the heat generated by the current passing through the resistance wire. The material of the heating resistance wire is usually selected to be an alloy with high resistivity and good heat resistance, such as nickel-chromium alloy. This design can provide uniform and efficient heating effect, so that the inert gas can be uniformly and quickly preheated to the set temperature.

[0041] In this embodiment, the gas delivery member is preferably a blower 30, which can blow the heated inert gas into the cavity of the baking oven 10.

[0042] In one of the embodiments, the baking oven 10 comprises a box body 11 and a positive pressure resistant oven door 12 arranged on the box body 11, and the positive pressure resistant oven door 12 and the box body 11 are sealed by a sealing element.

[0043] Specifically, the positive pressure resistant oven door 12 is designed to maintain the sealing of the baking oven 10 in a positive pressure environment. The sealing element can take various forms, such as a ring-shaped sealing strip, to ensure the tight contact between the oven door and the box body 11 and prevent gas leakage. The ring-shaped sealing strip can be made of various materials, such as silicone rubber, fluororubber, or polytetrafluoroethylene, which have good high-temperature resistance, corrosion resistance, and elastic recovery performance, and can ensure effective sealing effect in a high-temperature baking environment. The ring-shaped sealing strip can be installed by embedding, i.e., embedding the sealing strip in the sealing groove of the oven door of the baking oven 10.

[0044] Therefore, through the above technical means, the sealing of the baking oven 10 in a positive pressure environment is effectively guaranteed. Specifically, the box body 11 and the positive pressure resistant oven door 12 are sealed by a sealing element, which ensures the sealing of the baking oven 10 in a positive pressure environment and prevents gas leakage, so as to more easily destroy the water balance in the battery cell and ensure that the moisture in the battery cell can be effectively removed during the baking process, thereby improving the overall performance of the battery cell.

[0045] In one of the embodiments, the positive pressure resistant oven door 12 is provided with a positive pressure resistant observation window 13.

[0046] Specifically, the positive pressure resistant observation window 13 can be made of high transparency and high temperature resistant material, such as quartz glass or special polymer material, to ensure good transparency and pressure resistance under high temperature environment. The size and shape of the observation window can be designed according to actual needs to adapt to different sizes and shapes of the battery cell oven 10. The design of the observation window should consider the pressure resistance under positive pressure environment to ensure that it will not break or deform under high pressure. In addition, the installation method of the observation window can be embedded or surface attached to ensure close combination with the positive pressure resistant oven door 12 to prevent gas leakage.

[0047] Therefore, the setting of the positive pressure resistant observation window 13 enables the operator to directly observe the inside of the oven 10 during the baking process without opening the oven door. This design avoids temperature fluctuations and pressure changes caused by frequent opening of the oven door, ensuring the stability and efficiency of the baking process. Specifically, through the observation window, the operator can monitor the baking state of the battery cell in real time and adjust the baking parameters in time, thereby improving the baking effect and the quality of the battery cell.

[0048] The setting of the positive pressure resistant observation window 13 also improves the convenience and safety of operation. During the baking process, the operator does not need to frequently approach the high temperature oven 10, reducing the operation risk. At the same time, the transparency and pressure resistance of the observation window ensure that the operator can clearly observe the inside of the oven 10, improving the accuracy and efficiency of the operation.

[0049] As a preferred embodiment, the positive pressure resistant observation window 13 can also be equipped with an automatic cleaning device to prevent dust and dirt from affecting the observation effect. The automatic cleaning device can clean by spraying cleaning agent or using a mechanical brush to ensure that the observation window always remains clear and transparent.

[0050] In one embodiment, one side of the positive pressure resistant oven door 12 is hinged to the oven body 11 through a hinge, and the other side is detachably fixedly connected to the oven body 11 through a bolt.

[0051] Specifically, the hinge allows the oven door to be easily opened and closed, while the detachable fixed connection of the bolt ensures the stability and sealing of the oven door during the baking process, preventing the oven door from being accidentally opened due to positive pressure. As a preferred embodiment, the hinge can be made of metal material, which has high corrosion resistance and high temperature resistance to adapt to the high temperature conditions of the baking environment. The bolt can be made of stainless steel to ensure its firmness and durability under high temperature and positive pressure environment. In addition, the design of the bolt can also include an anti-loose structure to prevent loosening due to vibration during the baking process.

[0052] The design solves the convenience and sealing of the box door when the battery cell needs to be frequently checked or replaced during the baking process, and ensures the firmness of the box door in the positive pressure environment. Compared with the prior art, the technical scheme of the application not only improves the convenience of the box door, but also enhances the stability and sealing of the box door during the baking process, thereby improving the overall performance of the battery cell baking device.

[0053] In one embodiment, the vacuum pumping assembly includes a vacuum pump and an air exhaust pipe 41, one end of the air exhaust pipe 41 being connected with the baking oven 10 and the other end being connected with the vacuum pump.

[0054] Specifically, the vacuum pump can generate sufficient negative pressure to exhaust the air in the baking oven 10 through the air exhaust pipe 41, thereby achieving the purpose of vacuumizing. As a preferred embodiment, the vacuum pump can be a rotary vane vacuum pump or a screw vacuum pump, which has high air exhaust efficiency and stability. The air exhaust pipe 41 can be made of high-temperature-resistant and corrosion-resistant materials, such as stainless steel or Teflon, to ensure long-term use in high-temperature baking environment.

[0055] The vacuum pumping assembly realizes the vacuumizing function of the baking oven 10 through the design of the vacuum pump and the air exhaust pipe 41. This design helps to quickly and effectively remove the air in the baking oven 10 during the battery cell baking process, providing a low-pressure environment for the battery cell, which is beneficial to the evaporation and removal of moisture, thereby improving the baking effect and quality of the battery cell.

[0056] Preferably, the gas delivery member is a blower 30. Specifically, the blower 30 can more effectively deliver inert gas into the baking oven 10 through forced convection, so that the pressure in the baking oven 10 is maintained at positive pressure. As a preferred embodiment, the blower 30 can adopt a centrifugal or axial flow structure to ensure efficient delivery of gas. Further, the selection of the blower 30 can be adjusted according to the size of the baking oven 10 and the required gas flow to meet the baking needs of different specifications of battery cells. In addition, the blower 30 can also be equipped with a frequency converter to realize precise control of the gas flow, thereby optimizing the gas distribution and temperature uniformity in the baking process.

[0057] By using the blower 30 as the gas delivery member, the application can significantly improve the delivery efficiency of inert gas, which helps to heat the battery cell more quickly and uniformly, thereby improving the baking efficiency and overall performance of the battery cell.

[0058] In one embodiment, the baking oven 10 is provided with a clamp for clamping the battery cell.

[0059] Specifically, the clamp can have multiple clamping cavities formed by multiple heat-conducting plates, and the size of the clamping cavities is matched with the size of the battery cell. The design of the clamp can ensure that the battery cell maintains a stable position during the baking process, thereby improving the baking effect and the overall performance of the battery cell. The use of the clamp helps to uniformly distribute heat and ensure that all parts of the battery cell are evenly heated, avoiding uneven baking problems caused by unstable position.

[0060] The heat-conducting plates can be made of metal materials such as aluminum or copper to ensure good heat-conducting performance. The design of the clamping cavities can be customized according to the specific size of the battery cell to ensure that the battery cell is uniformly heated during the baking process. In addition, the number and layout of the clamping cavities can be adjusted according to the shape and size of the battery cell to achieve the best heating effect. As a preferred embodiment, the inner wall of the clamping cavity can be provided with grooves or protrusions to increase the contact area with the battery cell, thereby improving the heat conduction efficiency.

[0061] By using multiple heat-conducting plates to form multiple clamping cavities, the clamping cavities can heat the battery cell from four sides, ensuring that the battery cell is uniformly heated during the baking process, thereby improving the baking efficiency and effect. This design helps to ensure that the battery cell remains stable during the baking process, avoiding uneven heating problems caused by size mismatch, thereby improving the overall performance and service life of the battery cell.

[0062] In operation, the battery cell is placed in the clamp of the baking oven 10, the oven door is fixed on the oven body 11 by bolts, and the baking process is started. The inert gas is heated to the set temperature by the heating resistance wire, and then the inert gas is blown into the oven body 11 of the baking oven 10 by the air blower 30 and the pressure is maintained at 0.2 MPa, and the clamp is used to preheat the battery cell. After preheating, the oven body 11 is vacuumized and baked, and after maintaining the pressure for a period of time, the heated inert gas is continuously introduced, and the subsequent vacuumization and introduction of the heated inert gas are alternately performed.

[0063] Taking a 280AH square cell as an example, the preheating temperature rise time experiment of the battery cell using the battery cell baking device of the present application is shown in Table 1 as follows:

[0064] Table 1

[0065] Heating time Conventional pre-heat (cell temperature) Current baking equipment (cell temperature) 60 min 75.1℃ 81.2℃ 90 min 82.7℃ 94.5℃ 120 min 96.2℃ 100.3℃ 150 min 99.8℃ 100.7℃

[0066] Taking a 280AH square cell as an example, the preheating temperature rise time experiment of the battery cell using the battery cell baking device of the present application is shown in Table 1 as follows:

[0067] Table 2

[0068] Baking duration Conventional baking (cell moisture) Current baking equipment (cell moisture) 6H 362 ppm 315 ppm 8H 287 ppm 240 ppm

[0069] It can be known from the above experimental results that the battery cell is preheated and baked by the battery cell baking device, so that the temperature rising time of the battery cell is reduced, the preheating efficiency, baking effect and baking efficiency of the battery cell are improved, and the baking energy consumption is reduced.

[0070] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Therefore, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. An electric cell baking apparatus characterized by comprising: The utility model relates to a kind of battery baking equipment, including: Baking oven, which is used to place battery cell and bake; Inert gas heating assembly, including inert gas delivery channel and heating element, one end of the inert gas delivery channel is connected with inert gas source, the other end is connected with the baking oven, the inert gas delivery channel is provided with valve for controlling the inert gas delivery channel on-off, the heating element is used to heat inert gas in the inert gas delivery channel to set temperature; Vacuumizing assembly, which is connected with the baking oven, is used to vacuumize the baking oven; Gas delivery part, which is used to introduce inert gas in the inert gas delivery channel into the baking oven, makes the pressure in the baking oven be positive pressure.

2. The cell baking apparatus of claim 1, wherein, The heating element is a heating resistance wire.

3. The cell baking apparatus of claim 1, wherein, The baking oven includes a box body and a positive pressure resistant door arranged on the box body, and the positive pressure resistant door and the box body are sealed by a sealing element.

4. The cell baking apparatus of claim 3, wherein, The positive pressure resistant door is provided with a positive pressure resistant observation window.

5. The cell baking apparatus of claim 3, wherein, One side of the positive pressure resistant door is hinged to the box body by a hinge, and the other side is detachably fixedly connected to the box body by a bolt.

6. The cell baking apparatus of claim 3, wherein, The sealing element is an annular sealing strip.

7. The cell baking apparatus of claim 1, wherein The vacuumizing assembly includes a vacuum pump and an air exhaust pipeline, one end of the air exhaust pipeline is connected with the baking oven, and the other end is connected with the vacuum pump.

8. The cell baking apparatus of claim 1, wherein, The gas delivery part is a blower.

9. The cell baking apparatus of claim 1, wherein, The baking oven is provided with a clamp for clamping battery cell.

10. The cell baking apparatus of claim 9, wherein, The clamp has a plurality of clamping cavities enclosed by a plurality of heat-conducting plates, and the size of the clamping cavities is matched with the size of the battery cell.

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