A cylindrical lithium battery core hot pressing device

Abstract

The present application provides a cylindrical lithium battery core hot pressing device, which includes a pressing plate, a driving component and an electromagnetic heating component; a plurality of pressing plates are combined to form a cavity for accommodating the cylindrical lithium battery core; the driving component is connected to the pressing plate in a one-to-one correspondence to drive the pressing plate to move radially so that the pressing plate gathers inward or separates outward; the electromagnetic heating component is sleeved on the periphery of the pressing plate for electromagnetic heating of the pressing plate, and the pressing plate is made of electromagnetic induction material. After the battery cell is placed in the hot pressing device, the pressing plate gathers inward under the push of the driving component to form a cavity for accommodating the cylindrical lithium battery core, the inner wall of the cavity matches the outer side of the cylindrical lithium battery core, the pressing plate applies a certain pressure inward to the cylindrical lithium battery core, the electromagnetic heating component is powered on to heat the pressing plate to reach a certain temperature, and the loose battery cell is hot-pressed into shape, so that the positive and negative electrode sheets and the diaphragm are closely attached together, avoiding the short circuit caused by the misalignment of the electrode sheet and the diaphragm, reducing the internal resistance, and ensuring the electrical performance and safety performance of the battery.

Description

Technical Field

[0001] The present application belongs to the technical field of battery preparation, and specifically relates to a hot pressing device for a cylindrical lithium battery core. Background Art

[0002] The cells of cylindrical lithium batteries are usually manufactured using a winding process, which involves stacking and aligning the continuous positive electrode sheets, separators and continuous negative electrode sheets in an orderly manner, and then using a battery winding machine to roll the stacked positive electrode sheets / separators / negative electrode sheets into cylindrical cells. Due to the large number of winding layers and the presence of winding stress during the winding process, there is a gap between the positive and negative electrode sheets and the separator, and the electrode sheets and separators are prone to wrinkling, deformation and displacement during the subsequent die-cutting and shaping process. Utility Model Content

[0003] In view of this, the purpose of the present application is to provide a cylindrical lithium battery core hot pressing device to hot press the core of the cylindrical lithium battery, so that the diaphragm in the battery cell fits tightly with the positive and negative electrode sheets to avoid wrinkling, deformation and displacement, and the inside of the battery will not loosen. At the same time, it shortens the ion migration path, reduces the internal resistance, and ensures the electrical performance and safety performance of the battery.

[0004] The present application provides a cylindrical lithium battery core hot pressing device, wherein the cylindrical lithium battery core comprises a pressing plate, a driving assembly and an electromagnetic heating assembly;

[0005] A plurality of the pressing plates are combined to form a cavity for accommodating the cylindrical lithium battery coil core;

[0006] The inner wall of the cavity matches the outer side of the cylindrical lithium battery roll core;

[0007] The driving assembly is connected to the pressing plates in a one-to-one correspondence and is used to drive the pressing plates to move radially so that the pressing plates gather inward or separate outward;

[0008] The electromagnetic heating component is sleeved on the periphery of the pressing plate and is used for electromagnetically heating the pressing plate.

[0009] Furthermore, the electromagnetic heating component includes an electromagnetic coil and an electromagnetic heating controller, and the electromagnetic coil is connected to the electromagnetic heating controller.

[0010] Furthermore, the driving assembly is connected to both ends of the pressing plate.

[0011] Furthermore, the pressing plate is an arc-shaped plate.

[0012] Furthermore, an outer surface of the pressing plate away from the cavity is provided with a heat-insulating layer.

[0013] Furthermore, it also includes a central column, and the cylindrical lithium battery roll core includes a core body and a central axis chamber;

[0014] The central column is placed at the center of the cavity and matches the central axis chamber.

[0015] This application has the following beneficial effects:

[0016] The cylindrical lithium battery core hot pressing device provided by the present application includes a pressing plate, a driving component and an electromagnetic heating component; a plurality of pressing plates are combined to form a cavity for accommodating the cylindrical lithium battery core; the driving component is connected to the pressing plate in a one-to-one correspondence to drive the pressing plate to move radially so that the pressing plate gathers inward or separates outward; the electromagnetic heating component is sleeved on the periphery of the pressing plate for electromagnetic heating of the pressing plate, and the pressing plate is made of electromagnetic induction material. After the battery cell is placed in the hot pressing device, the pressing plate gathers inward under the push of the driving component to form a cavity for accommodating the cylindrical lithium battery core, the inner wall of the cavity matches the outer side of the cylindrical lithium battery core, the pressing plate applies a certain pressure inward to the cylindrical lithium battery core, the electromagnetic heating component is powered on to heat the pressing plate to reach a certain temperature, and the loose battery cell is hot-pressed to form, so that the positive and negative electrode sheets and the diaphragm are closely attached together, avoiding the short circuit caused by the misalignment of the electrode sheet and the diaphragm, shortening the ion migration path, reducing the internal resistance, and ensuring the electrical performance and safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an overall schematic diagram of a cylindrical lithium battery core hot pressing device provided in some embodiments of the present application,

[0018] Figure 2 is an overall schematic diagram of a cylindrical lithium battery core hot pressing device provided in some embodiments of the present application,

[0019] Figure 3 is an overall schematic diagram of a cylindrical lithium battery core hot pressing device provided in some embodiments of the present application,

[0020] Figure 4 is a schematic diagram of an explosion of a cylindrical lithium battery core hot pressing device provided in some embodiments of the present application,

[0021] Figure 5 It is a schematic diagram of the combined hot pressing device for cylindrical lithium battery core provided in some embodiments of the present application.

[0022] Description of reference numerals:

[0023] 100. Cylindrical lithium battery roll core, 110. Core body, 120. Central axis chamber, 200. Press plate, 210. Cavity, 300. Driving assembly, 400 Electromagnetic heating assembly, 410. Electromagnetic coil, 420. Electromagnetic heating controller, 500. Central column. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] like Figure 1-5 As shown, the present application discloses a cylindrical lithium battery core hot pressing device, including a pressing plate 200, a driving assembly 300 and an electromagnetic heating assembly 400, and the hot pressing device is used to hot press a cylindrical lithium battery core 100, wherein the cylindrical lithium battery core 100 includes a core body 110 and a central axis chamber 120. Among them, a plurality of pressing plates 200 are combined to form a cavity 210 for accommodating the cylindrical lithium battery core 100, and the inner wall of the cavity 210 matches the outer side of the cylindrical lithium battery core 100; the driving assembly 300 is connected to the pressing plate 200 in a one-to-one correspondence to drive the pressing plate 200 to move radially so that the pressing plate 200 gathers inward or separates outward; the electromagnetic heating assembly 400 is sleeved on the periphery of the pressing plate 200 to perform electromagnetic heating on the pressing plate 200.

[0028] After the battery cell is placed in the hot pressing device, the pressing plate gathers inward under the push of the driving component to form a cavity to accommodate the cylindrical lithium battery core. The pressing plate applies a certain pressure inward to the cylindrical lithium battery core. The electromagnetic heating component is energized to electromagnetically heat the pressing plate to a certain temperature, hot-pressing the loose battery cell into shape so that the positive and negative electrode sheets and the diaphragm fit tightly together.

[0029] In some embodiments provided by the present invention, the pressing plate 200 is made of an electromagnetic induction material, and the base material of the pressing plate 200 is selected from one of electromagnetic induction materials such as nickel-containing iron alloy, cobalt-containing iron alloy, nickel-cobalt iron alloy or graphite.

[0030] In some embodiments provided by the present invention, the electromagnetic heating assembly 400 includes a high temperature resistant electromagnetic coil 410 and an electromagnetic heating controller 420, and the high temperature resistant electromagnetic coil 410 and the electromagnetic heating controller 420 are connected.

[0031] Electromagnetic induction heating is a method of using a high-frequency electric transmitter to generate current in an electron field to heat electromagnetic induction materials. Electromagnetic induction heater is a device that uses the principle of electromagnetic induction to heat. Its working principle is that the drive control unit provides high-frequency alternating current to the coil wrapped around the round tube surrounded by the pressing plate 200, forming a high-frequency changing magnetic field in the space in the middle of the coil, and forming countless eddy currents in the metal material of the tube wall surrounded by the pressing plate 200, generating heat, thereby quickly heating the pressing plate, with high working efficiency. Moreover, due to electromagnetic induction heating, the pressing plate 200 is heated homogeneously, and the heating effect is better than other heat conduction methods such as contact conduction of resistance wire. At the same time, when conductive graphite with electromagnetic induction properties is used in the positive and negative electrode coatings of lithium batteries, the inside of the battery can also be heated by electromagnetic induction due to the presence of conductive graphite, so that the entire cylindrical lithium battery core is heated at the same time, and the hot pressing effect is better.

[0032] like Figure 2 As shown, in some embodiments provided by the present invention, the driving assembly 300 is connected to both ends of the pressing plate 200. The driving member 300 can be a cylinder, and the output end of the cylinder moves radially to push the pressing plate 200 to gather inward or separate outward.

[0033] like Figure 1-Figure 5 As shown, in some embodiments provided by the present invention, the pressing plate 200 is an arc-shaped plate. Figure 2 As shown, in a specific embodiment of this embodiment, the pressure plate 200 includes three arc-shaped plates, the inner walls of the arc-shaped plates after folding match the outer sides of the cylindrical lithium battery core 100, and the driving assembly 300 is connected to both ends of the arc-shaped plates.

[0034] In some embodiments provided by the present invention, a heat preservation layer is provided on the outer surface of the pressing plate 200 away from the cavity 210. Providing a heat preservation layer on the outer surface of the pressing plate 200 can reduce the heat loss of the pressing plate 200 during the induction heating process.

[0035] In some embodiments provided by the present invention, a central column 500 is further included; the central column 500 is placed at the center of the cavity 210 and matches the central axis chamber 120. The shape and specifications of the central column 500 are similar to the winding needle in the winding process. The central axis chamber 120 of the cylindrical lithium battery core 100 is the cavity left after the winding needle is pulled out after the winding is completed. The central column matches the central axis chamber 120 and can support the cylindrical lithium battery core during the hot pressing process to prevent it from deforming.

[0036] In some embodiments provided by the present invention, the substrate of the central column 500 is selected from one of the electromagnetic induction materials such as nickel-containing iron alloy, cobalt-containing iron alloy, nickel-cobalt iron alloy or graphite. The central column 500 is made of electromagnetic induction material, so that the central column can also be heated by induction, and the heating is carried out from the inside of the cylindrical lithium battery roll core, further optimizing the hot pressing effect.

[0037] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A cylindrical lithium battery core hot pressing device, characterized in that: It comprises a pressing plate (200), a driving component (300) and an electromagnetic heating component (400); A plurality of the pressing plates (200) are combined and surrounded to form a cavity (210) for accommodating the cylindrical lithium battery winding core (100); The inner wall of the cavity (210) matches the outer side of the cylindrical lithium battery winding core (100); The driving assembly (300) is connected to the pressing plate (200) in a one-to-one correspondence and is used to drive the pressing plate (200) to move radially so that the pressing plate (200) is gathered inward or separated outward; The electromagnetic heating component (400) is sleeved on the periphery of the pressing plate (200) and is used to perform electromagnetic heating on the pressing plate (200).

2. The cylindrical lithium battery core hot pressing device according to claim 1, characterized in that: The electromagnetic heating component (400) comprises an electromagnetic coil (410) and an electromagnetic heating controller (420), and the electromagnetic coil (410) and the electromagnetic heating controller (420) are connected.

3. The cylindrical lithium battery core hot pressing device according to claim 1, characterized in that: The driving assembly (300) is connected to both ends of the pressing plate (200).

4. The cylindrical lithium battery core hot pressing device according to claim 1, characterized in that: The pressing plate (200) is an arc-shaped plate.

5. The cylindrical lithium battery core hot pressing device according to claim 1, characterized in that: An outer surface of the pressing plate (200) away from the cavity (210) is provided with a heat-insulating layer.

6. The cylindrical lithium battery core hot pressing device according to any one of claims 1 to 5, characterized in that: Also comprising a central column (500), the cylindrical lithium battery winding core (100) comprising a core body (110) and a central axis chamber (120); The central column (500) is placed at the center of the cavity (210) and matches the central axis chamber (120).

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