Electromagnetic heating plate

Abstract

The utility model relates to an electromagnetic heating plate, which comprises an upper heating plate assembly and a lower heating plate assembly, a lithium battery cell is arranged between the upper heating plate assembly and the lower heating plate assembly, and the upper heating plate assembly and the lower heating plate assembly respectively heat from two opposite surfaces of the lithium battery cell; the upper heating plate assembly is further divided into an upper installation base plate, an upper heat insulation plate, an upper hot pressing plate and an upper electromagnetic coil. The lower heating plate assembly is further divided into a lower installation base plate, a lower heat insulation plate, a lower hot pressing plate and a lower electromagnetic coil. According to the electromagnetic heating plate disclosed by the utility model, the hot-pressing plate is directly heated through medium-frequency electromagnetic induction to transfer heat to the battery cell, so that the heat conduction time required by the battery cell in the temperature rise and heat preservation processes is greatly shortened, and the temperature of the heating plate is monitored in real time while heating is carried out; and the lifting mechanism of the hot press drives the upper heating plate assembly to press the battery cell, so that the heat conduction of the battery cell is more uniform, the hot press molding effect of the battery cell is intact, and the utilization rate and the productivity of the whole machine are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery core manufacturing, in particular to an electromagnetic heating plate. Background Art

[0002] In the current lithium battery cell manufacturing process, cells freshly produced by winding or laminating machines undergo a hot pressing process. This process bonds the loose positive and negative electrode sheets together through the stacked separators to form a single, fixed cell. The hot pressing process involves placing the cell between the upper and lower press plates inside the press. The plates are heated and transfer heat to the cell, bringing it from room temperature to the set temperature required for bonding and forming. The thickness of the entire cell after hot pressing is typically 4 to 30 mm.

[0003] In existing hot presses, the traditional heating method is to transfer the heat of the silicone electric heating plate to the battery cell through the steel mold hot pressing plate. This silicone electric heating plate can only reach a maximum power of 1.5 kW. The heating wire is wrapped inside the silicone plate. During the heating process, the heating wire is energized to generate heat and transfer it to the silicone plate. The silicone plate then transfers heat to the upper and lower hot pressing plates. Only then can the hot pressing plate transfer heat to the battery cell. The entire process takes 30 minutes to heat the hot pressing plate from room temperature to the set temperature. When the battery cell is hot pressed, the heat absorbed by the upper and lower hot pressing plates by the battery cell needs to be replenished from the silicone heating plate. The lower heating power and the extra installation gap when the silicone transfers heat to the hot pressing plate further aggravate the low heat replenishment efficiency. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the heat transfer efficiency is low during the process of heating the battery core using a silicone electric heating plate, resulting in poor heating effect of the battery core and energy waste.

[0005] In order to solve the above technical problems, the utility model provides an electromagnetic heating plate, comprising: an upper heating plate assembly and a lower heating plate assembly, a lithium battery cell is arranged between the upper heating plate assembly and the lower heating plate assembly, and the upper heating plate assembly and the lower heating plate assembly heat the lithium battery cell from two opposite sides respectively; the upper heating plate assembly is further divided into an upper mounting substrate, an upper heat insulation plate, an upper hot pressing plate and an upper electromagnetic coil, the upper heat insulation plate is connected to the upper mounting substrate, the upper electromagnetic coil is arranged in the upper heat insulation plate, the upper hot pressing plate is connected to the upper The heat insulation plate is connected to the end face away from the upper mounting substrate, and the upper electromagnetic coil is used for heating when power is applied to generate magnetic flux lines; the lower heating plate assembly is further divided into a lower mounting substrate, a lower heat insulation plate, a lower hot pressing plate and a lower electromagnetic coil, the lower heat insulation plate is connected to the lower mounting substrate, the lower electromagnetic coil is arranged in the lower heat insulation plate, the lower hot pressing plate is connected to the end face of the lower heat insulation plate away from the lower mounting substrate, and the lower electromagnetic coil is used for heating when power is applied to generate magnetic flux lines, and the upper hot pressing plate and the lower hot pressing plate are respectively in contact with two opposite surfaces of the lithium battery cell. The electromagnetic heating plate of the present invention requires a large amount of timely replenishment of heat to be supplied to the battery cell during the process of heating the battery cell to the set temperature and maintaining heat and pressure. The electromagnetic heating plate can solve this problem well, replacing the traditional silicone electric heating plate with low heating power and low heat conduction efficiency, so that the entire battery cell can be evenly heated to the set temperature required for hot pressing when entering the hot press, thereby saving heat conduction auxiliary time to the greatest extent.

[0006] In one embodiment of the present invention, at least one upper temperature sensor is provided in the upper hot pressing plate, and the upper temperature sensor is used to detect the temperature of the upper hot pressing plate.

[0007] In one embodiment of the present invention, at least one lower temperature sensor is installed within the lower heat platen to detect its temperature. The upper and lower temperature sensors heat the upper and lower heat plates, allowing them to quickly reach a set temperature. This ensures that the battery cells receive the required heat promptly during the heat pressing process, minimizing the time required for heating and heat transfer.

[0008] In one embodiment of the present invention, the upper hot pressing plate is in the shape of a rectangular flat plate, and upper anti-scalding protection plates are provided on the four side walls of the upper hot pressing plate, and the upper anti-scalding protection plates are used for heat insulation and anti-scalding.

[0009] In one embodiment of the present invention, the lower hot pressing plate is in the shape of a rectangular flat plate, and lower anti-scalding protection plates are provided on the four side walls of the lower hot pressing plate, and the lower anti-scalding protection plates are used for heat insulation and anti-scalding.

[0010] In one embodiment of the present invention, a rectangular groove one is provided on the end face of the upper heat insulation plate opposite to the upper hot pressing plate, an upper pad is provided in the rectangular groove one, a rectangular groove two is provided on the end face of the upper pad opposite to the upper hot pressing plate, the upper electromagnetic coil is arranged in the rectangular groove two, and the upper electromagnetic coil is in contact with the upper hot pressing plate.

[0011] In one embodiment of the present invention, a rectangular groove three is provided on the end face opposite to the lower hot pressing plate, a lower pad is provided in the rectangular groove three, a rectangular groove four is provided on the end face opposite to the lower hot pressing plate, the lower electromagnetic coil is arranged in the rectangular groove four, and the lower electromagnetic coil is in contact with the lower hot pressing plate.

[0012] In one embodiment of the present invention, the upper electromagnetic coil and the lower electromagnetic coil are connected in series via a wire.

[0013] In one embodiment of the present invention, the upper electromagnetic coil includes a plurality of wires extending from the inside to the outside, and the plurality of wires are arranged in a circular runway shape.

[0014] In one embodiment of the present invention, the lower electromagnetic coil includes a plurality of wires extending from the inside to the outside, and the plurality of wires are arranged in a circular runway shape.

[0015] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0016] The electromagnetic heating plate described in the utility model directly heats the hot pressing plate through medium-frequency electromagnetic induction to transfer heat to the battery cell, which greatly shortens the heat conduction time required for the battery cell in the heating and insulation process. During heating, the temperature of the heating plate is monitored in real time. The lifting mechanism of the hot press drives the upper heating plate assembly to press the battery cell, which also makes the heat conduction of the battery cell more uniform, so that the battery cell can achieve the hot pressing molding effect intact, thereby improving the utilization rate and production capacity of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the content of the utility model easier to understand, the utility model is further described in detail below based on the specific embodiments of the utility model and in conjunction with the accompanying drawings, wherein

[0018] Figure 1 This is an assembly diagram of an electromagnetic heating plate in a preferred embodiment of the present utility model;

[0019] Figure 2 This is an exploded view of the electromagnetic heating plate in the preferred embodiment of the present utility model;

[0020] Figure 3 This is a top view of the electromagnetic heating plate in the preferred embodiment of the present utility model;

[0021] Figure 4 In the preferred embodiment of the present utility model Figure 3 Middle AA cross section;

[0022] Figure 5 This is a winding diagram of the upper electromagnetic coil or the lower electromagnetic coil in the preferred embodiment of the present invention.

[0023] Explanation of the reference numerals in the specification: upper heating plate assembly 10, upper mounting substrate 101, upper heat insulation plate 102, upper anti-scalding protection plate 103, upper hot pressing plate 104, upper temperature sensor 105, upper electromagnetic coil 106, rectangular groove one 107, upper pad 108, rectangular groove two 109, lower heating plate assembly 20, lower mounting substrate 201, lower heat insulation plate 202, lower anti-scalding protection plate 203, lower hot pressing plate 204, lower temperature sensor 205, lower electromagnetic coil 206, rectangular groove three 207, lower pad 208, rectangular groove four 209, lithium battery cell 30. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0025] Reference Figure 1-4 As shown, the electromagnetic heating plate of the present invention comprises: an upper heating plate assembly 10 and a lower heating plate assembly 20, a lithium battery cell 30 is provided between the upper heating plate assembly 10 and the lower heating plate assembly 20, and the upper heating plate assembly 10 and the lower heating plate assembly 20 respectively heat from two opposite sides of the lithium battery cell 30; the upper heating plate assembly 10 is further divided into an upper mounting substrate 101, an upper heat insulation plate 102, an upper hot pressing plate 104 and an upper electromagnetic coil 106, the upper heat insulation plate 102 is connected to the upper mounting substrate 101, the upper electromagnetic coil 106 is arranged in the upper heat insulation plate 102, the upper hot pressing plate 104 is connected to the end face of the upper heat insulation plate 102 away from the upper mounting substrate 101, the The upper electromagnetic coil 106 is used for heating when power is applied to generate magnetic flux lines; the lower heating plate assembly 20 is further divided into a lower mounting substrate 201, a lower heat insulation plate 202, a lower hot pressing plate 204 and a lower electromagnetic coil 206, the lower heat insulation plate 202 is connected to the lower mounting substrate 201, the lower electromagnetic coil 206 is arranged in the lower heat insulation plate 202, the lower hot pressing plate 204 is connected to the end face of the lower heat insulation plate 202 away from the lower mounting substrate 201, the lower electromagnetic coil 206 is used for heating when power is applied to generate magnetic flux lines, the upper electromagnetic coil 106 and the lower electromagnetic coil 206 are connected in series through a wire, and the upper hot pressing plate 104 and the lower hot pressing plate 204 are respectively in contact with two opposite surfaces of the lithium battery cell 30.

[0026] When the above electromagnetic heating plate is used:

[0027] The lifting mechanism of the hot press drives the upper heating plate assembly 10 down, applying a set pressure on the lithium battery cell 30. At this time, the upper electromagnetic coil 106 in the upper heating plate assembly 10 and the lower electromagnetic coil 206 in the lower heating plate assembly 20 begin to heat the upper hot plate 104 and the lower hot plate 204 respectively at a certain electromagnetic frequency. The upper electromagnetic coil 106 and the lower electromagnetic coil 206 are connected in series by wires and are controlled by the same control box to ensure that the magnetic field released when power is turned on is the same. In addition, the coils themselves are connected by special wires and winding methods to ensure that the upper hot plate 104 and the lower hot plate 204 can be evenly heated to prevent the temperature from being too high in any one place. After the hot pressing is completed, the lifting mechanism of the hot press drives the upper heating plate assembly up. At this time, the handling robot removes the hot-pressed lithium battery cell 30 and places it in the next process.

[0028] The above scheme adopts an upper electromagnetic coil 106 and a lower electromagnetic coil 206, and uses the electromagnetic coil to replace the silicone electric heating plate. In the application of the lithium battery hot pressing process, the coil does not need to be cooled by water to dissipate heat, which greatly saves cost and mechanical space. It can be directly installed in the heat insulation plate on the back of the hot pressing plate without major changes to the original process and structural space, and has a wide range of applications. The magnetic flux lines generated when the electromagnetic coil is energized can directly heat the hot pressing plate evenly. When the input power is only twice the power of the silicone heating plate, it only takes one-tenth of the original heating time to heat the hot pressing plate from room temperature to the set temperature. When the battery cell is heated in the hot press, the electromagnetic heating plate can also heat the hot pressing plate in time, greatly shortening the heating time required for the battery cell, thereby reducing the number of hot pressing machines in the winding machine or stacking machine production line, greatly reducing equipment costs and improving equipment utilization and production capacity.

[0029] In the above structure, at least one upper temperature sensor 105 is provided in the upper hot plate 104, and the upper temperature sensor 105 is used to detect the temperature of the upper hot plate 104. The upper hot plate 104 is a rectangular flat plate, and upper scalding protection plates 103 are provided on the four side walls of the upper hot plate 104 to insulate and prevent scalding.

[0030] In the above structure, a rectangular groove 107 is provided on the end face of the upper heat insulation plate 102 opposite to the upper hot pressing plate 104, an upper pad 108 is provided in the rectangular groove 107, a rectangular groove 2 109 is provided on the end face of the upper pad 108 opposite to the upper hot pressing plate 104, the upper electromagnetic coil 106 is arranged in the rectangular groove 2 109, and the upper electromagnetic coil 106 is in contact with the upper hot pressing plate 104.

[0031] In the above structure, at least one lower temperature sensor 205 is provided in the lower hot platen 204, and the lower temperature sensor 205 is used to detect the temperature of the lower hot platen 204. The lower hot platen 204 is a rectangular flat plate, and lower anti-scalding protection plates 203 are provided on the four side walls of the lower hot platen 204 to insulate and prevent scalding.

[0032] In the above structure, a rectangular groove three 207 is provided on the end face of the lower heat insulation plate 202 opposite to the lower hot pressing plate 204, a lower pad 208 is provided in the rectangular groove three 207, a rectangular groove four 209 is provided on the end face of the lower pad 208 opposite to the lower hot pressing plate 204, the lower electromagnetic coil 206 is arranged in the rectangular groove four 209, and the lower electromagnetic coil 206 is in contact with the lower hot pressing plate 204.

[0033] The multi-layer loose battery cells made by the winding machine or stacking machine need to be heated to the set temperature in order to be hot pressed in the hot press. The electromagnetic heating plate of the hot press adopts a special wire and flat-plate winding method, that is, refer to Figure 5 As shown, the upper electromagnetic coil 106 and the lower electromagnetic coil 206 both include a plurality of wires extending from the inside to the outside, and the plurality of wires are arranged in a circular runway shape.

[0034] After configuring this electromagnetic heating plate in the hot press, the temperature of the lithium battery cell 30 inside and outside the lithium battery cell 30 can be quickly and evenly heated to the set temperature during the hot pressing process. At the same time, the positive and negative electrodes and diaphragms of the lithium battery cell 30 are intact, which greatly reduces the hot pressing time of the battery cell. In addition, this patent adopts a special wire and flat coil winding method. In the application of the lithium battery hot pressing process, the coil does not need to be cooled by water to dissipate heat, which greatly saves costs and mechanical space. This method can also maximize the heating effect of the hot pressing plate by electromagnetic induction.

[0035] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An electromagnetic heating plate, characterized in that: include: An upper heating plate assembly and a lower heating plate assembly, wherein a lithium battery cell is disposed between the upper heating plate assembly and the lower heating plate assembly, and the upper heating plate assembly and the lower heating plate assembly respectively heat the lithium battery cell from two opposite sides; The upper heating plate assembly is further divided into an upper mounting base plate, an upper heat insulation plate, an upper hot pressing plate and an upper electromagnetic coil. The upper heat insulation plate is connected to the upper mounting base plate. The upper electromagnetic coil is arranged in the upper heat insulation plate. The upper hot pressing plate is connected to the end surface of the upper heat insulation plate away from the upper mounting base plate. The upper electromagnetic coil is used for heating when energized to generate magnetic flux lines. The lower heating plate assembly is further divided into a lower mounting substrate, a lower heat insulation plate, a lower hot pressing plate and a lower electromagnetic coil. The lower heat insulation plate is connected to the lower mounting substrate, and the lower electromagnetic coil is arranged in the lower heat insulation plate. The lower hot pressing plate is connected to the end surface of the lower heat insulation plate away from the lower mounting substrate. The lower electromagnetic coil is used for heating when power is applied to generate magnetic flux lines. The upper hot pressing plate and the lower hot pressing plate are respectively in contact with two opposite surfaces of the lithium battery cell.

2. The electromagnetic heating plate according to claim 1, characterized in that: At least one upper temperature sensor is provided in the upper hot pressing plate, and the upper temperature sensor is used to detect the temperature of the upper hot pressing plate.

3. The electromagnetic heating plate according to claim 1 or 2, characterized in that: At least one lower temperature sensor is provided in the lower hot pressing plate, and the lower temperature sensor is used to detect the temperature of the lower hot pressing plate.

4. The electromagnetic heating plate according to claim 1, characterized in that: The upper hot pressing plate is in the shape of a rectangular flat plate, and upper anti-scalding protection plates are provided on the four side walls of the upper hot pressing plate, and the upper anti-scalding protection plates are used for heat insulation and anti-scalding.

5. The electromagnetic heating plate according to claim 1 or 4, characterized in that: The lower hot pressing plate is in the shape of a rectangular flat plate, and a lower anti-scalding protection plate is provided on the four side walls of the lower hot pressing plate, and the lower anti-scalding protection plate is used for heat insulation and anti-scalding.

6. The electromagnetic heating plate according to claim 1, characterized in that: A rectangular groove 1 is provided on the end surface of the upper heat insulation plate opposite to the upper hot pressing plate, an upper pad is provided in the rectangular groove 1, a rectangular groove 2 is provided on the end surface of the upper pad opposite to the upper hot pressing plate, the upper electromagnetic coil is arranged in the rectangular groove 2, and the upper electromagnetic coil is in contact with the upper hot pressing plate.

7. The electromagnetic heating plate according to claim 1 or 6, characterized in that: A rectangular groove three is provided on the end surface of the lower heat insulation plate opposite to the lower hot pressing plate, a lower pad is provided in the rectangular groove three, a rectangular groove four is provided on the end surface of the lower pad opposite to the lower hot pressing plate, the lower electromagnetic coil is arranged in the rectangular groove four, and the lower electromagnetic coil is in contact with the lower hot pressing plate.

8. The electromagnetic heating plate according to claim 1, characterized in that: The upper electromagnetic coil and the lower electromagnetic coil are connected in series via a wire.

9. The electromagnetic heating plate according to claim 1, characterized in that: The upper electromagnetic coil includes a plurality of wires extending from the inside to the outside, and the plurality of wires are arranged in a circular runway shape.

10. The electromagnetic heating plate according to claim 1 or 9, characterized in that: The lower electromagnetic coil includes a plurality of wires extending from the inside to the outside, and the plurality of wires are arranged in a circular runway shape.

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