A lithium battery production and processing cell preheating device

Abstract

This utility model provides a preheating device for lithium battery production and processing cells, relating to the field of lithium battery production and processing technology. It includes: a cell preheating base, with preheating top plates symmetrically distributed on the upper surface of the base; an S-shaped flow cavity is provided inside the base and the top plates; the two ends of the S-shaped flow cavity are connected to a connecting cavity; a fan is installed inside the connecting cavity; a first heat transfer plate is embedded and fixed on the upper surface of the base; a second heat transfer plate is embedded and fixed on the lower surface of the top plate; heat exchange tubes are equidistantly distributed inside the first and second heat transfer plates; a constant temperature chamber is connected to the rear of each heat exchange tube via a circulation output pipe and a circulation input pipe; and a heater is inserted and installed inside the heating chamber. This utility model solves the problem in the prior art where, when the electric heating device inside the cell support platform malfunctions after long-term use, it requires shutdown, disassembly, and repair, affecting the efficiency of cell preheating processing.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production and processing technology, specifically to a preheating device for lithium battery cells during production and processing. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the positive / negative electrode material and a non-aqueous electrolyte solution. In lithium-ion battery production, a bare cell is formed by winding a positive electrode sheet, a negative electrode sheet, and a separator between the positive and negative electrode sheets. The bare cell is then hot-pressed. To improve electrolyte fluidity, restore electrode activity, and reduce irreversible damage caused by low temperatures, thereby extending battery life, the cell needs to be preheated before hot-pressing. A search revealed existing technology (publication number: CN202321092968.2) for a cell preheating device, which describes that "the cell support unit of this utility model includes two cell support platforms. In use, the cell is placed on the lower cell support platform, and then the other cell..." The support platform presses against the upper surface of the battery cell, allowing the battery cell to be transferred directly using two support platforms. During the transfer process, the two support platforms maintain surface contact with the battery cell, ensuring uniform force distribution and preventing misalignment between electrode layers. Because the support platform contains an electric heating device, a preheating chamber is unnecessary during the preheating process. The two support platforms directly heat the battery cell, and heat is transferred directly to the cell via the hot press plate and the support surface, effectively improving heat transfer efficiency, reducing energy consumption, and shortening preheating time. However, in existing technologies, if the electric heating device inside the support platform malfunctions after prolonged use, it requires shutdown for disassembly and repair, impacting the efficiency of battery cell preheating. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a preheating device for lithium battery production and processing is provided to solve the problem that when the electric heating device inside the battery cell carrying platform fails after long-term use, it requires shutdown for disassembly and repair, which affects the efficiency of battery cell preheating and processing.

[0004] To achieve the above objectives, a cell preheating device for lithium battery production and processing is provided, comprising: a cell preheating base, wherein preheating top plates are symmetrically distributed at the upper end of the cell preheating base.

[0005] The battery cell preheating base and the preheating top plate are provided with an S-shaped flow cavity inside. The two ends of the S-shaped flow cavity are connected to a connecting cavity. A fan is installed inside the connecting cavity. A first heat transfer plate is embedded and fixed on the upper surface of the battery cell preheating base. A second heat transfer plate is embedded and fixed on the lower surface of the preheating top plate. Heat exchange tubes are equidistantly distributed inside the first and second heat transfer plates. The front ends of the heat exchange tubes are connected through a connecting pipe. The rear ends of the heat exchange tubes are connected to a constant temperature chamber through a circulation output pipe and a circulation input pipe, respectively. A heating chamber and an insulation chamber are provided inside the constant temperature chamber. A heater is inserted and installed inside the heating chamber.

[0006] Furthermore, the left and right sides of the cell preheating base are connected to the preheating top plate via electric push rods, and the S-shaped flow cavity is located at the rectangular concave surface of the first heat transfer plate and the second heat transfer plate.

[0007] Furthermore, the preheating top plate and the cell preheating base are embedded with fixing blocks screwed into their upper and lower end faces; and a fan is installed on the side of the fixing block, and a constant temperature box is placed at the lower end of the cell preheating base.

[0008] Furthermore, an infusion pump is connected to the surface of the circulation output pipe; and the circulation output pipe is connected to the heating chamber, while one end of the circulation input pipe is connected to the insulation chamber.

[0009] Furthermore, the lower end of the heating chamber is connected to the insulation chamber via a drain pipe; and an electric valve is installed on the surface of the drain pipe.

[0010] Furthermore, a motor is fixedly supported on the upper surface of the constant temperature chamber, and a stirring blade is shaft-connected to the lower end of the motor via a coupling; and the stirring blade is located inside the heating chamber.

[0011] Furthermore, heaters are distributed on both the left and right sides of the stirring blades; and the upper end of the heater is fixed to the constant temperature box by bolts.

[0012] The beneficial effects of this utility model are as follows: the lithium battery cell preheating device of this utility model utilizes a first heat transfer plate, a second heat transfer plate, a heat exchange tube, a circulating output tube, a circulating input tube, a constant temperature chamber, and a heater to form a non-contact preheating mechanism. The heat medium circulates within the constant temperature chamber through the heat exchange tubes in the first and second heat transfer plates, exchanging heat with the lithium battery cell to achieve preheating treatment of the lithium battery cell. This facilitates uniform and stable preheating of the lithium battery cell by the preheating device, reduces the phenomenon of local overheating or underheating of the preheated cell, and enhances the preheating effect of the preheating device. The external circulating output tube, circulating input tube, constant temperature chamber, and heater facilitate quick and easy inspection and replacement of faulty parts, shorten downtime for maintenance, and thus improve the preheating processing efficiency of lithium battery cells. Attached Figure Description

[0013] Figure 1This is a front view structural diagram of the preheating device for lithium battery production and processing according to an embodiment of the present utility model.

[0014] Figure 2 This is a front view cross-sectional structural diagram of the lithium battery production and processing cell preheating device according to an embodiment of the present utility model.

[0015] Figure 3 This is a front view partial cross-sectional view of the connection structure of the cell preheating base and the preheating top plate in an embodiment of this utility model.

[0016] Figure 4 This is a front view cross-sectional structural diagram of the constant temperature chamber according to an embodiment of the present utility model.

[0017] Figure 5 This is a partial three-dimensional structural diagram of the first heat transfer plate in an embodiment of the present invention.

[0018] In the diagram: 1. Battery cell preheating base; 11. Preheating top plate; 12. Connecting pipe; 13. Electric push rod; 14. Connecting cavity; 15. Fixing block; 16. Fan; 17. S-shaped flow cavity; 2. Circulation output pipe; 21. Circulation input pipe; 22. Infusion pump; 3. Constant temperature chamber; 31. Heating chamber; 32. Insulation chamber; 33. Motor; 34. Coupling; 35. Stirring blades; 36. Drain pipe; 4. First heat transfer plate; 41. Second heat transfer plate; 42. Heat exchange tube; 5. Heater. Detailed Implementation

[0019] Reference Figures 1 to 5 As shown, this utility model provides a cell preheating device for lithium battery production and processing, including: a cell preheating base 1, with preheating top plates 11 symmetrically distributed on the upper end of the cell preheating base 1.

[0020] An S-shaped flow cavity 17 is provided inside the preheating base 1 and the preheating top plate 11 of the battery cell. The two ends of the S-shaped flow cavity 17 are connected to the connecting cavity 14. A fan 16 is installed inside the connecting cavity 14. A first heat transfer plate 4 is embedded and fixed on the upper surface of the preheating base 1 and a second heat transfer plate 41 is embedded and fixed on the lower surface of the preheating top plate 11. Heat exchange tubes 42 are equidistantly distributed inside the first heat transfer plate 4 and the second heat transfer plate 41. The front ends of the heat exchange tubes 42 are connected through the connecting pipe 12. The rear ends of the heat exchange tubes 42 are connected to the constant temperature box 3 through the circulation output pipe 2 and the circulation input pipe 21, respectively. A heating chamber 31 and a heat preservation chamber 32 are provided inside the constant temperature box 3. A heater 5 is inserted and installed inside the heating chamber 31.

[0021] First, the distance between the cell preheating base 1 and the preheating top plate 11 is adjusted by the electric push rod 13, so that the lithium battery cell can pass between the cell preheating base 1 and the preheating top plate 11. The infusion pump 32 is turned on, so that the circulation input pipe 21 delivers the heat medium in the insulation chamber 32 of the constant temperature box 3 to the heat exchange tube 42 in the second heat transfer plate 41. The heat medium flows through the heat exchange tube 42 in the second heat transfer plate 41 to the heat exchange tube 42 in the first heat transfer plate 4, and then is sent back to the heating chamber 31 in the constant temperature box 3 through the circulation output pipe 2 connected to the rear end of the first heat transfer plate 4. After being heated and stirred by the heater 5 and the stirring blade 35 in the heating chamber 31, it is discharged into the insulation chamber 32, thereby realizing the circulation flow and heat exchange process of the heat medium. This facilitates the preheating treatment of the lithium battery cell passing between the first heat transfer plate 4 and the second heat transfer plate 41, and makes it easier for the preheating device to preheat the lithium battery cell evenly and stably, reducing the phenomenon of local overheating or underheating of the preheated cell, and enhancing the preheating effect of the preheating device.

[0022] In this embodiment, the left and right sides of the cell preheating base 1 are connected to the preheating top plate 11 via electric push rods 13, and the S-shaped flow cavity 17 is distributed at the rectangular concave surface of the first heat transfer plate 4 and the second heat transfer plate 41.

[0023] In a preferred embodiment, the electric push rod 13 is used to adjust the distance between the cell preheating base 1 and the preheating top plate 11, so that lithium battery cells of different thicknesses can pass between the cell preheating base 1 and the preheating top plate 11. The lithium battery cells passing between the cell preheating base 1 and the preheating top plate 11 come into contact with the first heat transfer plate 4 and the second heat transfer plate 41, thereby allowing the heat medium in the heat exchange tube 42 to exchange heat with the lithium battery cells, achieving the effect of preheating the cells.

[0024] In this embodiment, a fixing block 15 is embedded and screwed into the upper and lower end faces of the preheating top plate 11 and the cell preheating base 1; and a fan 16 is installed on the side of the fixing block 15, and a constant temperature box 3 is placed at the lower end of the cell preheating base 1.

[0025] In a preferred embodiment, the S-shaped flow cavity 17 formed at the rectangular concave surface of the heat transfer plate is driven by the fan 16 in the connecting cavity 14, so that the airflow in the cavity circulates between the S-shaped flow cavity 17 and the connecting cavity 14, which facilitates the uniform distribution of surface heat of the first heat transfer plate 4 and the second heat transfer plate 41.

[0026] In this embodiment, an infusion pump 22 is connected to the surface of the circulation output pipe 2; and the circulation output pipe 2 is connected to the heating chamber 31, and one end of the circulation input pipe 21 is connected to the insulation chamber 32.

[0027] As a preferred embodiment, the infusion pump 22 facilitates the output or input of the medium through the circulation output pipe 2 and the circulation input pipe 21 into the heat exchange pipe 42, so that the lithium battery cell can be heat-exchanged through the circulating medium.

[0028] In this embodiment, the lower end of the heating chamber 31 is connected to the insulation chamber 32 via a drain pipe 36; and an electric valve is installed on the surface of the drain pipe 36.

[0029] As a preferred embodiment, the drain pipe 36 facilitates the discharge of the medium heated to a certain temperature in the heating chamber 31 into the insulation chamber 32, so that the constant temperature medium is transported to the heat exchange tube 42 through the circulation input pipe 21.

[0030] In this embodiment, a motor 33 is fixedly supported on the upper surface of the constant temperature chamber 3, and a stirring blade 35 is shaft-connected to the lower end of the motor 33 through a coupling 34; the stirring blade 35 is located inside the heating chamber 31. Heaters 5 are distributed on both the left and right sides of the stirring blade 35; and the upper end of the heater 5 is fixed to the constant temperature chamber 3 by bolts.

[0031] In a preferred embodiment, the motor 33 drives the stirring blades 35 to stir, ensuring uniform heating of the medium within the heating chamber 31. The plug-in heater 5 facilitates routine maintenance and replacement, reducing downtime for repairs and thus improving the preheating efficiency of the lithium battery cells.

[0032] This utility model's lithium battery cell preheating device effectively solves the problem in existing technologies where the electric heating device inside the cell support platform malfunctions after prolonged use, requiring shutdown for disassembly and repair, which affects the cell preheating efficiency. It facilitates uniform and stable preheating of lithium battery cells, reduces localized overheating or underheating, enhances the preheating effect, and allows for convenient and quick inspection and replacement of faulty parts, shortening downtime for maintenance and thus improving the preheating efficiency of lithium battery cells. It is suitable for lithium battery cell preheating processes.

Claims

1. A preheating device for lithium battery production and processing cells, comprising: A cell preheating base (1), wherein preheating top plates (11) are symmetrically distributed on the upper end of the cell preheating base (1), characterized in that: The preheating base (1) and the preheating top plate (11) of the battery cell are provided with an S-shaped flow cavity (17) on the inner side. The two ends of the S-shaped flow cavity (17) are connected to a connecting cavity (14). A fan (16) is installed inside the connecting cavity (14). A first heat transfer plate (4) is embedded and fixed on the upper surface of the preheating base (1). A second heat transfer plate (41) is embedded and fixed on the lower surface of the preheating top plate (11). Heat exchange tubes (42) are distributed at equal intervals inside the first heat transfer plate (4) and the second heat transfer plate (41). The front end of the heat exchange tube (42) is connected through a connecting pipe (12). The rear side of the heat exchange tube (42) is connected to a constant temperature box (3) through a circulation output pipe (2) and a circulation input pipe (21). A heating chamber (31) and a heat preservation chamber (32) are provided inside the constant temperature box (3). A heater (5) is inserted and installed inside the heating chamber (31).

2. The lithium battery cell preheating device according to claim 1, characterized in that, The cell preheating base (1) is connected to the preheating top plate (11) on the left and right sides by electric push rods (13), and the S-shaped flow cavity (17) is located at the rectangular concave surface of the first heat transfer plate (4) and the second heat transfer plate (41).

3. The lithium battery cell preheating device according to claim 1, characterized in that, The preheating top plate (11) and the cell preheating base (1) are fitted with fixing blocks (15) on their upper and lower ends; and a fan (16) is installed on the side of the fixing block (15); and a constant temperature box (3) is placed at the lower end of the cell preheating base (1).

4. The lithium battery cell preheating device according to claim 1, characterized in that, The surface of the circulation output pipe (2) is connected to an infusion pump (22); and the circulation output pipe (2) is connected to the heating chamber (31), and one end of the circulation input pipe (21) is connected to the insulation chamber (32).

5. A preheating device for lithium battery production and processing cells according to claim 1, characterized in that, The lower end of the heating chamber (31) is connected to the insulation chamber (32) through a drain pipe (36); and an electric valve is installed on the surface of the drain pipe (36).

6. The lithium battery cell preheating device according to claim 1, characterized in that, The upper surface of the constant temperature chamber (3) is fixedly supported by a motor (33), and the lower end of the motor (33) is connected to a stirring blade (35) through a coupling (34); and the stirring blade (35) is located inside the heating chamber (31).

7. A preheating device for lithium battery production and processing cells according to claim 6, characterized in that, Heaters (5) are distributed on both the left and right sides of the stirring blade (35); and the upper end of the heater (5) is fixed to the constant temperature box (3) by bolts.

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