Cylindrical battery cell baking jig
By combining a heating base, heating rod, and heating plate with a negative pressure environment, the problems of low efficiency and uneven moisture distribution in existing heating methods are solved, resulting in shorter battery baking time and improved performance.
Patent Information
- Application Number
- CN202520299831.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-25
- Publication Date
- 2026-03-03
- Estimated Expiration
- 2035-02-25
AI Technical Summary
In the current cylindrical battery production process, the blower-type and bottom-contact heating methods are inefficient and have long baking times, resulting in inconsistent moisture content inside and outside the cell, which affects battery performance.
It adopts a combination structure of heating base, heating rod and heating plate. Through the sunken area of heating base and the axial penetration design of heating rod, combined with heating sleeve, the battery cell is heated in all directions. Air replacement is carried out in negative pressure environment to ensure uniform removal of moisture inside and outside the battery cell.
It shortens the baking time, improves manufacturing efficiency, ensures the uniformity and consistency of battery performance, and enhances the overall performance of the battery.
Smart Images
Figure CN223965742U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of cylindrical battery production technology, specifically to a cylindrical battery cell baking fixture. Background Technology
[0002] In current cylindrical battery production processes, blower-type and bottom-contact heating methods are commonly used to remove moisture from the cells. However, this heating method has the following problems:
[0003] Firstly, from a manufacturing perspective, existing heating methods are inefficient and require long baking times, which is not conducive to improving production line efficiency. If the production line cycle is matched, the amount of baking equipment needs to be increased several times. This method requires a large area and is costly, which is not conducive to the concept of cost reduction and efficiency improvement.
[0004] Secondly, from a performance perspective, existing heating methods can lead to inconsistent moisture levels inside and outside the battery cell (wound core), which can easily result in poor internal resistance consistency, water loss during cycles, and other issues. This prevents the battery cell from performing at its full potential and causes significant performance loss. Utility Model Content
[0005] To address the shortcomings of existing technologies, this utility model provides a cylindrical battery cell baking fixture to solve the problems of low efficiency and inconsistent moisture content between the inside and outside of the existing blower-type and bottom-contact heating methods.
[0006] To achieve the above objectives, the present invention provides the following technical solution:
[0007] A baking fixture for cylindrical battery cells, comprising:
[0008] A heating base with a recessed area for placing cylindrical battery cells to constrain the lower current collector of the cylindrical battery cells; and
[0009] The heating rod passes through the cylindrical battery cell axially from top to bottom and then contacts and connects with the middle of the sinking area.
[0010] The heating rod is connected to a heating plate at its top, and the heating plate is in close contact with the upper current collector of the cylindrical battery cell.
[0011] In one embodiment disclosed in this application, the heating base is provided with a first annular step, and the area enclosed by the first annular step is the sinking area;
[0012] A recess is provided in the middle of the sinking area to accommodate the bottom end of the heating rod.
[0013] In one embodiment disclosed in this application, a lifting rod is provided at the center of the top surface of the heating plate.
[0014] In one embodiment disclosed in this application, a heating sleeve is also included;
[0015] The heating sleeve is inserted and connected to the heating base for baking the cylindrical battery cells after they are installed in the casing.
[0016] In one embodiment disclosed in this application, the area enclosed inside the heating sleeve is a placement area with the heating base as its base;
[0017] The depth of the placement area is greater than the length of the cylindrical battery cell after it is installed in the casing, so as to completely surround the cylindrical battery cell.
[0018] In one embodiment disclosed in this application, the outer diameter of the heating plate is smaller than the inner diameter of the heating sleeve, so as to form an annular gap between the heating sleeve and the heating plate, for the escape of moisture during the baking process after the cylindrical battery cell is installed in the casing.
[0019] In one embodiment disclosed in this application, the lifting rod extends beyond the upper edge of the heating sleeve to facilitate retrieval.
[0020] In one embodiment disclosed in this application, a second annular step is connected to the first annular step;
[0021] The lower edge of the heating sleeve is provided with an annular boss, which is inserted into the second annular step and abuts against the first annular step.
[0022] In one embodiment disclosed in this application, the heating base, heating rod, heating plate, and heating sleeve are used to bake the cylindrical battery cell by first changing the temperature and then maintaining a constant temperature.
[0023] In one embodiment disclosed in this application, the cylindrical battery cell baking fixture is located in a sealed negative pressure environment, and the negative pressure environment is equipped with a blower ventilation device to replace the air inside.
[0024] Compared with the prior art, the beneficial effects of this utility model are:
[0025] 1. By using a heating base, heating rod, and heating plate, the upper, middle, and lower current collectors of the cylindrical battery cell are heated simultaneously. This can shorten the baking time, improve the production line efficiency, and achieve the goal of reducing costs and increasing efficiency. At the same time, it can ensure that the internal and external parts of the cylindrical battery cell are heated evenly and that the moisture is removed consistently, which greatly improves the performance of the battery.
[0026] 2. The first annular step and the recess in the middle of the sinking area ensure that the cylindrical battery cell is in the center after being placed in the sinking area, thereby ensuring that the heat convection between the heating base and the heating plate can be transferred to the cylindrical battery cell as much as possible, and improving the heat utilization rate of the heating base and the heating plate.
[0027] 3. By heating the cylindrical battery cell with a sleeve, the baking time can be further shortened, the production line efficiency can be improved, and the inside and outside of the cylindrical battery cell can be heated evenly to ensure consistent moisture removal, thereby further improving the battery's performance indicators. Attached Figure Description
[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0030] Figure 2 This is a schematic diagram of the main cross-section of the present invention;
[0031] Figure 3 This is a three-dimensional structural diagram of the heating base;
[0032] Figure 4 This is a three-dimensional structural diagram of the heating rod and heating plate;
[0033] Figure 5 This is a three-dimensional structural diagram of the heating sleeve. Detailed Implementation
[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0039] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.
[0040] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0041] See Figures 1-5 As shown, this utility model provides a cylindrical battery cell baking fixture, comprising:
[0042] The heating base 10 has a recessed area 11 for placing cylindrical battery cells to constrain the lower current collector of the cylindrical battery cells; and
[0043] The heating rod 20 passes through the cylindrical battery cell axially from top to bottom and then contacts the middle of the sinking area 11.
[0044] The heating rod 20 has a heating plate 30 connected to its top end, and the heating plate 30 is in contact with the upper current collector of the cylindrical battery cell in a fitted manner.
[0045] During operation, the lower end of the cylindrical battery cell is placed into the sinking area 11, ensuring the lower current collector of the cell is in close contact with the sinking area 11. Then, the heating rod 20 is inserted from top to bottom, with its lower end touching the middle of the sinking area 11. The heating plate 30 is attached to and in contact with the upper current collector of the cylindrical battery cell. Power is then applied, causing the heating base 10, heating rod 20, and heating plate 30 to start working and generate heat, thus baking the cylindrical battery cell. Moisture escapes from the cylindrical battery cell and evaporates outwards. In other words, by simultaneously heating the upper, middle, and lower current collectors of the cylindrical battery cell using the heating base 10, heating rod 20, and heating plate 30, baking time can be shortened, production line efficiency improved, and cost reduction and efficiency enhancement achieved. Simultaneously, it ensures uniform heating inside and outside the cylindrical battery cell, consistent moisture removal, and significantly improves battery performance.
[0046] The heating base 10 has a first annular step 12, and the area enclosed by the first annular step 12 is the sinking area 11. A recess (not shown in the figure) is provided in the middle of the sinking area 11 to accommodate the bottom end of the heating rod 20. Through the first annular step 12 and the recess in the middle of the sinking area 11, it can be ensured that the cylindrical battery cell is in the center position after being placed in the sinking area 11, thereby ensuring that the heat convection between the heating base 10 and the heating plate 30 can be transferred to the cylindrical battery cell as much as possible, and improving the heat utilization rate of the heating base 10 and the heating plate 30.
[0047] To facilitate the insertion and removal of the heating rod 20 from the cylindrical battery cell, a lifting rod 31 is provided in the middle of the top surface of the heating plate 30.
[0048] The aforementioned cylindrical battery cell baking fixture also includes a heating sleeve 40, which is inserted into and connected to the heating base 10 for baking the cylindrical battery cell after it has been installed in the casing. At this time, the cylindrical battery cell, already installed in the casing, is placed into the heating sleeve 40, with the bottom of the casing contacting the recessed area 11 of the heating base 10. Then, a heating rod 20 is inserted axially from top to bottom through the cylindrical battery cell, with its bottom end contacting the center of the inner bottom of the casing and separating it from the recessed area 11. Simultaneously, a heating plate 30 is attached to and in contact with the upper current collector of the cylindrical battery cell. Power is then applied, and the baking of the cylindrical battery cell after installation is completed through the heating base 10, heating rod 20, heating plate 30, and heating sleeve 40. In other words, baking the cylindrical battery cell from all sides using the heating sleeve 40 can further shorten the baking time, improve production line efficiency, and ensure uniform heating of the inside and outside of the cylindrical battery cell, guaranteeing consistent moisture removal and further improving battery performance.
[0049] The area enclosed inside the heating sleeve 40 is a placement area with the heating base 10 as the base. The depth of the placement area is greater than the length of the cylindrical battery cell after it is inserted into the casing, so as to completely surround the cylindrical battery cell.
[0050] The outer diameter of the heating plate 30 is smaller than the inner diameter of the heating sleeve 40, so as to form an annular gap between the heating sleeve 40 and the heating plate 30, which is used for the escape of moisture during the baking process after the cylindrical battery cell is put into the casing.
[0051] The lifting rod 31 extends slightly above the upper edge of the heating sleeve 40 for easy handling.
[0052] A second annular step 13 is connected to the first annular step 12; an annular boss 41 is provided on the lower edge of the heating sleeve 40, and the annular boss 41 is inserted into the second annular step 13 and abuts against the first annular step 12. The annular boss 41 is restricted by the first annular step 12 and the second annular step 13, thereby realizing the insertion and connection of the heating sleeve 40 to the heating base 10.
[0053] In this embodiment, the heating base 10, heating rod 20, heating plate 30, and heating sleeve 40 bake the cylindrical battery cell using a heating method of first changing the temperature and then maintaining a constant temperature. Specifically, in the initial temperature-changing stage (within 0-1 hour), the heating base 10, heating rod 20, heating plate 30, and heating sleeve 40 simultaneously and slowly increase the temperature from 0°C to 95°C, and then maintain a constant temperature of 95°C to enter the constant temperature stage and continuously bake the cylindrical battery cell for 12 hours.
[0054] To further shorten baking time and improve production line efficiency, the aforementioned cylindrical battery cell baking fixture is placed in a sealed negative pressure environment (such as a box), and this negative pressure environment is equipped with a blower to replace the air inside. Specifically, during the baking process, a vacuum pump-type negative pressure device is used to evacuate the negative pressure environment, while a blower-type ventilation device blows air into the negative pressure environment to promptly remove the water vapor formed by the baking process from the cylindrical battery cells.
[0055] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. A cylindrical battery cell baking jig, characterized by, The utility model relates to a cylindrical battery cell baking fixture, comprising: a heating base with a sunken area for placing a cylindrical battery cell to limit the lower current collecting plate of the cylindrical battery cell; and a heating rod axially passing through the cylindrical battery cell from top to bottom and being connected with the middle part of the sunken area; wherein, the top end of the heating rod is connected with a heating disc, and the heating disc and the upper current collecting plate of the cylindrical battery cell are in contact in a fitting manner.
2. The cylindrical battery cell baking fixture according to claim 1, wherein: a first annular step is arranged on the heating base, and the area surrounded by the first annular step is the sunken area; a recess is arranged in the middle part of the sunken area for accommodating the bottom end of the heating rod.
3. The cylindrical battery cell baking fixture of claim 2, wherein, a lifting rod is arranged in the middle part of the top surface of the heating disc.
4. The cylindrical battery cell baking fixture according to claim 3, wherein: a heating sleeve is further included; the heating sleeve is connected to the heating base by insertion for baking the cylindrical battery cell after being put into the shell.
5. The cylindrical battery cell baking fixture according to claim 4, wherein: the area surrounded by the inside of the heating sleeve is a placement area with the heating base as the bottom; the depth of the placement area is greater than the length of the cylindrical battery cell after being put into the shell to fully surround the cylindrical battery cell.
6. The cylindrical battery cell baking fixture of claim 5, wherein, the outer diameter of the heating disc is smaller than the inner diameter of the heating sleeve to form an annular gap between the heating sleeve and the heating disc for the escape of moisture during the baking process of the cylindrical battery cell after being put into the shell.
7. The cylindrical battery cell baking fixture of any one of claims 4-6, wherein, the lifting rod is higher than the upper edge of the heating sleeve to facilitate taking.
8. The cylindrical battery cell baking fixture according to claim 4, wherein: a second annular step is connected to the first annular step; an annular boss is arranged at the lower edge of the heating sleeve, and the annular boss is inserted into the inside of the second annular step and connected with the first annular step.
9. The cylindrical battery cell baking fixture of claim 4 or 8, wherein, the heating base, the heating rod, the heating disc and the heating sleeve bake the cylindrical battery cell in a heating mode of first changing temperature and then keeping temperature.
10. The cylindrical battery cell baking fixture of any one of claims 1-6, wherein, the cylindrical battery cell baking fixture is arranged in a closed negative pressure environment, and the negative pressure environment is provided with air blowing and ventilation equipment to replace the air inside.