Bare battery cell thermal shaping device based on Joule heating effect
By designing a device based on Joule thermal effect in the bare-cell thermal shaping process, using Joule thermal effect to achieve uniform heating and shaping of the bare-cell, the problems of uneven temperature and poor plastic surgery in the prior art are solved, and efficient moisture removal and plastic surgery effect are achieved.
Patent Information
- Application Number
- CN202420884551.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-25
AI Technical Summary
There are problems of uneven temperature and poor plastic surgery in the existing bare-cell thermal shaping process.
A bare-cell thermal shaping device based on Joule thermal effect is designed. By setting up several Joule thermal shaping tool partitions on the tooling, a bare-cell is placed on each partition, and pressure conduction and uniform heating are achieved using a guide rod and a fixed screw. At the same time, low-voltage electricity is sent to the short-circuit bare cell through low-voltage ear brushes, and the Joule thermal effect is used to convert the electric energy into heat energy to achieve uniform heating of a single bare cell.
It realizes uniform heating and shaping of the bare battery cell, improves moisture removal efficiency and shaping effect, has a simple structure and fast heating, which is suitable for rapid heating and shaping needs.
Smart Images
Figure CN222637347U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lithium battery manufacturing, and in particular to a bare battery core thermal shaping device based on Joule thermal effect. Background Art
[0002] In the pre-lithium battery manufacturing process, the thermal shaping process can remove moisture from the bare cell pole piece and shape the bare cell. The current bare cell thermal shaping process generally sets the heating unit and the shaping unit separately. The heating unit is an oven or a heating tray in the oven, and the shaping unit is a thermal shaping tool. This device has the disadvantages of uneven temperatures of different layers of bare cells in the tooling and the inside and outside of a single bare cell itself, resulting in poor moisture removal and shaping effects.
[0003] Based on this, the present application proposes a bare cell thermal shaping device based on Joule thermal effect to solve the above-mentioned shortcomings. Utility Model Content
[0004] The technical problem to be solved by the utility model is: how to solve the problems of uneven temperature and poor shaping effect existing in the current battery thermal shaping process.
[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:
[0006] A bare cell thermal shaping device based on Joule thermal effect, comprising an upper tooling plate and a lower tooling plate, which are connected by a fixed screw, and the upper tooling plate, the lower tooling plate and a plurality of Joule thermal shaping tooling partitions arranged between the upper tooling plate and the lower tooling plate are connected by a guide rod;
[0007] A self-heating module is arranged inside the Joule heat shaping tooling partition, a bare battery cell is placed on the top of the Joule heat shaping tooling partition, and a short-circuit connecting piece and a low-voltage pole ear brush for connecting the bare battery cell are also arranged on the Joule heat shaping tooling partition.
[0008] The present application sets a number of Joule heat shaping tooling partitions between the tooling upper top plate and the tooling lower bottom plate. Bare cells can be placed on each tooling partition, and pressure is applied through the topmost tooling upper top plate to conduct pressure from top to bottom to achieve shaping. Resistance wires are installed on the heat shaping tooling partitions to achieve uniform heating of different layers of bare cells in the tooling. At the same time, low voltage electricity is passed to the short-circuited bare cells through low-voltage pole ear brushes, and electrical energy is converted into thermal energy by the Joule thermal effect to achieve uniform heating of the inside and outside of a single bare cell. The above two schemes can achieve the purpose of efficient removal of moisture and good shaping effect. The present application has a simple structure, fast heating, and can effectively remove the bound water of the electrode material, so as to achieve rapid heating of the bare cells and fully volatilize the moisture between the pole pieces of the bare cells. In addition, the Joule heat shaping tool can be used to press and shape the bare cells under high temperature conditions, and integrate the bare cell shell welding process.
[0009] As a further solution of the utility model: guide holes slidably connected to the guide rods are provided at the four corner positions of each of the Joule heat shaping tooling partitions.
[0010] As a further solution of the utility model: the self-heating module is a copper resistance wire.
[0011] As a further solution of the utility model: the resistance wire is arranged in a "W" shape.
[0012] As a further solution of the utility model: a temperature sensor is provided on each of the Joule heat shaping tooling partitions.
[0013] As a further solution of the utility model: an anti-sticking coating is applied on the Joule heat shaping tooling partition, and the anti-sticking coating is a Teflon coating.
[0014] As a further solution of the utility model: a bottom base plate is provided between the Joule heat shaping tooling partition located at the bottom and the tooling lower bottom plate, and a shock-absorbing spring is provided between the bottom of the bottom base plate and the tooling lower bottom plate.
[0015] As a further solution of the utility model: a tab shaping plate corresponding to the bare battery cell electrode is provided on one side of the bottom of the Joule heat shaping tooling partition.
[0016] As a further solution of the utility model: the low-voltage tab brush includes a low-voltage electrical connection line and a tab brush, wherein the tab brush is connected to the bare battery cell via the low-voltage electrical connection line.
[0017] As a further solution of the utility model: positioning blocks are provided at the four corner positions on the top of each Joule heat shaping tooling partition.
[0018] Compared with the prior art, the beneficial effects of the utility model are:
[0019] The present application sets a number of Joule heat shaping tooling partitions between the tooling upper top plate and the tooling lower bottom plate. Bare cells can be placed on each tooling partition, and pressure is applied through the topmost tooling upper top plate to conduct pressure from top to bottom to achieve shaping. Resistance wires are installed on the heat shaping tooling partitions to achieve uniform heating of different layers of bare cells in the tooling. At the same time, low voltage electricity is passed to the short-circuited bare cells through low-voltage pole ear brushes, and electrical energy is converted into thermal energy by the Joule thermal effect to achieve uniform heating of the inside and outside of a single bare cell. The above two schemes can achieve the purpose of efficient removal of moisture and good shaping effect. The present application has a simple structure, fast heating, and can effectively remove the bound water of the electrode material, so as to achieve rapid heating of the bare cells and fully volatilize the moisture between the pole pieces of the bare cells. In addition, the Joule heat shaping tool can be used to press and shape the bare cells under high temperature conditions, and integrate the bare cell shell welding process. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a structural diagram of a bare cell thermal shaping device based on Joule thermal effect according to an embodiment of the utility model;
[0021] Figure 2 This is a rear side structural diagram of a bare cell thermal shaping device based on Joule thermal effect according to an embodiment of the utility model;
[0022] Figure 3 This is a bottom-up structural diagram of a bare cell thermal shaping device based on Joule thermal effect according to an embodiment of the utility model;
[0023] Figure 4 For the utility model embodiment Figure 1 A front view of
[0024] Figure 5 This is a schematic diagram of the structure of the Joule heat shaping tooling partition according to an embodiment of the utility model;
[0025] Figure 6 This is a schematic diagram of the structure of the resistance wire of the utility model embodiment;
[0026] Figure 7 This is a schematic structural diagram of a short-circuit connecting piece according to an embodiment of the utility model;
[0027] Figure 8 This is a schematic diagram of the structure of a low-voltage pole ear brush according to an embodiment of the utility model;
[0028] Explanation of the accompanying drawings: 1. upper top plate of the tooling; 2. fixing screw; 3. guide rod; 4. positioning block; 5. bare battery cell; 6. Joule heat shaping tooling partition; 61. guide hole; 62. resistance wire; 7. lower bottom plate of the tooling; 8. bottom substrate; 9. shock-absorbing spring; 10. short-circuit connecting piece; 11. low-voltage tab brush; 1101. low-voltage electrical connecting wire; 1102. tab brush; 12. tab shaping plate. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] Reference Figure 1 , Figure 2 and Figure 3 A bare cell thermal shaping device based on Joule thermal effect includes a tooling top plate 1, a fixing screw 2, a guide rod 3, a positioning block 4, a Joule shaping tooling partition 6, a tooling bottom plate 7, a bottom substrate 8, a shock absorbing spring 9, a short-circuit connecting piece 10, a low-voltage pole ear brush 11 and a pole ear shaping plate 12, wherein the tooling top plate 1 and the tooling bottom plate 7 are arranged in parallel, a plurality of Joule thermal shaping tooling partitions 6 are arranged between the tooling top plate 1 and the tooling bottom plate 7, a bottom substrate 8 is arranged below the lowest Joule thermal shaping tooling partition 6, and a plurality of shock absorbing springs 9 are arranged between the bottom substrate 8 and the tooling bottom plate 7, and the number of Joule thermal shaping tooling partitions 6 and shock absorbing springs 9 depends on the actual situation on site and is not limited in this application. The heat shaping tooling of the present application is tightened by the fixing bolt 2. After tightening, the pressure on the bare battery cell 5 is specified to be 1T-2T, and the torque value of the tightening wrench is 60-120N.
[0031] Reference Figure 1 , Figure 2 and Figure 3 The upper top plate 1 of the tooling is connected to the lowest lower bottom plate 7 of the tooling by two fixing screws 2. The distance between the upper top plate 1 of the tooling and the lower bottom plate 7 of the tooling is adjusted by adjusting the position of the upper top plate 1 of the tooling on the fixing screws 2. At the same time, guide rods 3 are connected at the four corner positions between the upper top plate 1 of the tooling and the lower bottom plate 7 of the tooling. The guide rods 3 enable the Joule heat shaping tooling partition 6 to be accurately positioned, and several Joule shaping tooling partitions 6 located in the middle are slidably connected to the guide rods 3, so that the distance between adjacent Joule shaping tooling partitions 6 is adjustable.
[0032] Reference Figure 5 , Figure 6 and Figure 7A copper resistance wire 63 is provided inside the Joule heat shaping tooling partition 6, and a power connection port is provided on the outside of the resistance wire 63, and the resistance wire 63 is arranged in a "W" shape. A bare battery cell 5 is placed on the top of the Joule heat shaping tooling partition 6. A short-circuit connecting piece 10 and a low-voltage pole ear brush 11 for connecting the bare battery cell are also provided on the Joule heat shaping tooling partition 6. A temperature sensor is provided on each Joule heat shaping tooling partition 6 to monitor the partition temperature in real time.
[0033] Furthermore, an anti-sticking coating is applied on the Joule heat shaping tooling partition 6, and the anti-sticking coating is a Teflon coating.
[0034] Furthermore, guide holes 61 slidably connected to the guide rod 3 are provided at the four corner positions of each Joule heat shaping tooling partition 6; a pole ear shaping plate 12 corresponding to the electrode of the bare battery cell 5 is provided on one side of the bottom of the Joule heat shaping tooling partition 6, and the pole ear shaping plate 12 is aligned flatly with the pole ear.
[0035] Furthermore, positioning blocks 4 are provided at the four corners of the top of each Joule heat shaping tooling partition 6, and the positioning blocks 4 enable the bare battery cell 5 to be accurately positioned.
[0036] Reference Figure 7 The short-circuit connecting sheet 10 is a metal sheet with good conductivity, and its purpose is to connect the positive and negative electrodes in the bare cell in series into a closed loop, and short-circuit the bare cell into a short-circuited bare cell. Preferably, the short-circuit connecting sheet is made of metal copper.
[0037] Reference Figure 8 , the low-voltage tab brush 11 includes a low-voltage electrical connection line 1101, a tab brush 1102 and a tab connection module, wherein the tab brush 1102 is connected to the bare cell 5 via the low-voltage electrical connection line 1101. The single-phase low-voltage current is in contact with the bare cell pole piece by the tab brush 1102 via the tab connection module, thereby transmitting the single-phase low-voltage electricity to the bare cell. Preferably, the low-voltage output end of the transformer is 12V-48V. The low-voltage tab brush 11 is connected to the low-voltage electricity, and the low-voltage current flows through the bare cell pole piece through the low-voltage tab brush 1102. Through the Joule heating effect, the electrical energy is converted into thermal energy to heat the bare cell, so that the inside and outside of a single bare cell itself can be uniformly heated.
[0038] It should be noted that a control panel is provided in the present application, and the control panel is connected to the temperature sensor on the low-voltage pole ear brush 11 and the Joule heat shaping tooling partition 6, and the staff can directly adjust the heating power through the control panel.
[0039] The specific operating principles of this application are as follows:
[0040] The present application is based on the Joule heating effect of electric current. By connecting the short-circuit connecting piece 10 to the positive and negative poles of the bare battery cell, and the low-voltage tab brush 11 to the positive and negative tabs of the bare battery cell, a closed circuit is formed. When the current passes through the electrode material between the pole pieces, the electrical energy is converted into thermal energy through the Joule heating effect, and the pole pieces are quickly heated. The present application has a simple structure, a fast temperature rise, and can effectively remove the bound water of the pole piece material, so that the bare battery cell can be quickly heated and the moisture between the pole pieces of the bare battery cell can be fully volatilized. In addition, through the Joule heat shaping tooling, and by applying pressure to the top plate 1 of the top tooling, that is, adjusting the position of the top plate 1 of the tooling so that it conducts pressure from top to bottom, the battery cell is pressed flat, and the bare battery cell can be pressed and shaped under high temperature conditions, integrating the bare battery cell into the shell welding process.
[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A bare cell thermal shaping device based on Joule thermal effect, characterized in that: It comprises an upper tooling plate (1) and a lower tooling plate (7), which are connected via a fixing screw (2); the upper tooling plate (1), the lower tooling plate (7) and a plurality of Joule heat shaping tooling partitions (6) arranged between the upper tooling plate (1), the lower tooling plate (7) and the ... A self-heating module is provided inside the Joule heat shaping tooling partition (6), a bare battery cell (5) is placed on the top of the Joule heat shaping tooling partition (6), and a short-circuit connecting piece (10) and a low-voltage tab brush (11) for connecting the bare battery cell are also provided on the Joule heat shaping tooling partition (6).
2. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: Each of the Joule heat shaping tooling partitions (6) is provided with guide holes (61) at four corner positions thereof, which are slidably connected to the guide rods (3).
3. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: The self-heating module is a copper resistance wire (62).
4. The bare cell thermal shaping device based on Joule thermal effect according to claim 3, characterized in that: The resistance wire (62) is arranged in a "W" shape.
5. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: Each of the Joule heat shaping tooling partitions (6) is provided with a temperature sensor.
6. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: The Joule heat shaping tooling partition (6) is coated with an anti-sticking coating, and the anti-sticking coating is a Teflon coating.
7. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: A bottom base plate (8) is also provided between the Joule heat shaping tooling partition plate (6) located at the bottom and the tooling lower bottom plate (7), and a shock absorbing spring (9) is also provided between the bottom of the bottom base plate (8) and the tooling lower bottom plate (7).
8. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: A tab shaping plate (12) corresponding to the electrode of the bare battery cell (5) is provided on one side of the bottom of the Joule heat shaping tooling partition (6).
9. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: The low-voltage tab brush (11) comprises a low-voltage electrical connection line (1101) and a tab brush (1102), wherein the tab brush (1102) is connected to the bare battery cell (5) via the low-voltage electrical connection line (1101).
10. The bare cell thermal shaping device based on Joule thermal effect according to claim 1, characterized in that: Positioning blocks (4) are provided at the four corner positions on the top of each Joule heat shaping tooling partition (6).