Hot-pressing manufacturing tool for lithium ion battery with wound battery cell

Abstract

The utility model discloses a lithium ion battery hot-pressing manufacturing tool for winding a battery cell. The lithium ion battery hot-pressing manufacturing tool comprises a hot-pressing inner cavity and an external protective cover, a hot-pressing positioning top plate and a hot-pressing positioning bottom plate are respectively mounted at the upper part and the bottom part of the hot-pressing inner cavity; a pressure cylinder is installed on the protective cover, and a driving shaft of the pressure cylinder penetrates through the protective cover and the hot-pressing inner cavity to be connected with the hot-pressing positioning top plate and controls and drives the hot-pressing positioning top plate to move up and down. According to the lithium ion battery hot-pressing manufacturing tool for the winding battery cell, the winding bare battery cell is baked and then hot-pressed, and the hot-pressing device is improved, so that the device can perform hot-pressing and short-circuit testing while baking, the position of a short-circuit testing tab can be debugged according to different types, and the production efficiency is improved. Tool molds needing to be customized due to frequent model replacement are reduced, the hot-pressing shaping effect can be greatly improved, and failure and deformation of the battery cell caused by poor hot-pressing effect are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wound lithium-ion batteries, in particular to a hot-pressing manufacturing tool for a wound battery core. Background Art

[0002] In recent years, with the rapid development of the lithium battery industry, the application of lithium batteries has penetrated into all aspects of our lives. Lithium battery factories have higher requirements for product production capacity and quality. In order to meet the production capacity requirements, wound lithium-ion cells are gradually being chosen by more manufacturers. However, due to its poor spatial stability and the C angle that is prone to deformation in the later stages of the cycle, the hot pressing and shaping of wound cells has become a key step in the lithium battery manufacturing process. In order to reduce deformation and improve the safety and electrochemical properties of lithium batteries, a diaphragm with coating technology is usually used. At this time, the hot pressing process uses PVDF to bond the pole piece and the diaphragm, removes the air in the internal gap, and increases the hardness of the cell to maintain the consistency of the cell thickness.

[0003] However, the traditional hot pressing method uses a heated pressing plate to hot-press and shape the core. The diaphragm coating layer is less bonded to the electrode, and the role of the diaphragm coating cannot be played in this process, which affects the subsequent shelling process and makes the core prone to deformation. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that the hot pressing shaping effect of wound lithium ion batteries is not obvious. The utility model provides a hot pressing production tool for lithium ion batteries with wound battery cells to solve the problem that the effect after hot pressing is not obvious and the winding core is prone to deformation in the subsequent shelling process.

[0005] The technical solution of the utility model is:

[0006] The hot pressing manufacturing tooling for the lithium-ion battery of the wound battery cell comprises a hot pressing inner cavity and an external protective cover; the upper part and the bottom part of the hot pressing inner cavity are respectively provided with a hot pressing positioning top plate and a hot pressing positioning bottom plate; a booster cylinder is installed on the protective cover, and the driving shaft of the booster cylinder passes through the protective cover and the hot pressing inner cavity to connect to the hot pressing positioning top plate, so as to control and drive the hot pressing positioning top plate to move up and down.

[0007] Preferably, a heating resistance wire is provided between the upper part of the hot pressing inner cavity and the protective cover, and a plurality of inlet / exhaust holes are provided on the left and right side walls of the hot pressing inner cavity.

[0008] Preferably, a main air hole is respectively provided on the left and right side walls of the protective cover, and a blower motor is installed on the left side of the protective cover.

[0009] Preferably, a guide rod is fixed to the front side of the hot pressing positioning base plate, two slide rails are arranged on the guide rod, and a battery cell short circuit test needle is arranged at the upper end of the slide rail.

[0010] Preferably, the hot pressing positioning top plate and the hot pressing positioning bottom plate are both provided with heating tubes.

[0011] Preferably, a guide column is installed on the top of the protective cover, and the guide column passes through the protective cover and the hot pressing inner cavity to connect to the hot pressing positioning top plate.

[0012] Preferably, a control display panel is installed on the left side of the protective cover.

[0013] The advantages of the utility model are:

[0014] The hot pressing tooling for the wound cell lithium-ion battery proposed in the utility model bakes the wound bare cell first and then hot presses it. By improving the hot pressing device, the device can perform hot pressing and short circuit testing at the same time as baking. The position of the short circuit test tab can be adjusted for different models, reducing the custom tooling molds required due to frequent model replacement, and can also greatly increase the hot pressing shaping effect, reducing the failure and deformation of the cell due to poor hot pressing effect. It has the following specific advantages:

[0015] 1. The utility model tooling can bake the battery cell before hot pressing, thereby increasing the hardness of the hot pressing molding and the adhesion of the coating layer to the electrode;

[0016] 2. The utility model tooling is suitable for battery cells of various thicknesses, without the need for frequent model changes;

[0017] 3. The short-circuit test tool of the utility model tooling can be debugged to adapt to the tab positions of battery cells of various sizes and models. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0019] Figure 1 It is a schematic diagram of the hot pressing manufacturing tooling of the lithium-ion battery with wound battery core of the utility model. DETAILED DESCRIPTION

[0020] like Figure 1 As shown, the hot pressing tooling for the wound cell of the present invention comprises a hot pressing inner cavity and an external protective cover 10; the upper and lower parts of the hot pressing inner cavity are respectively provided with a hot pressing positioning top plate 5 and a hot pressing positioning bottom plate 9; a booster cylinder 1 is installed on the protective cover 10, and the driving shaft of the booster cylinder 1 passes through the protective cover 10 and the hot pressing inner cavity to connect to the hot pressing positioning top plate 5, and controls and drives the hot pressing positioning top plate 5 to move up and down. A guide column 2 is installed on the top of the protective cover 10, and the guide column 2 passes through the protective cover 10 and the hot pressing inner cavity to connect to the hot pressing positioning top plate 5.

[0021] The hot pressing positioning top plate 5 and the hot pressing positioning bottom plate 9 are both provided with heating tubes. A heating resistor wire 3 is provided between the top of the hot pressing inner cavity and the protective cover 10, and a plurality of inlet / exhaust holes 8 are provided on the left and right side walls of the hot pressing inner cavity. A total air hole 6 is provided on the left and right side walls of the protective cover 10, and a blower motor 4 is installed on the left side of the protective cover 10.

[0022] A guide rod 12 is fixed to the front side of the hot pressing positioning bottom plate 9, and two slide rails 11 that can move left and right are arranged on the guide rod. A battery short circuit test pin 13 is arranged on the upper end of the slide rail 11. A control display panel 7 is installed on the left side of the protective cover 10.

[0023] When the utility model tooling is in operation, the battery cell is placed on the hot pressing positioning bottom plate 9 of the battery cell placement base, and the tab is facing outward and aligned with the short-circuit test needle 13 on the slide rail 11. After pressing the switch of the control display panel 7, the temperature in the protective cover gradually rises to the required temperature, the blower motor 4 is turned on, and the hot air is circulated in the protective cover cavity. After baking, the hot pressing positioning top plate 5 slowly descends, and the guide column 2 controls the descending position. At this time, the tab contacts the hot pressing short-circuit test needle 13, and the battery is short-circuited. After hot pressing, the positioning hot pressing top plate 5 slowly rises to the original position. The measurement data is displayed through the control display panel 7. If the value is abnormal, an alarm is given through the display panel.

[0024] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with the technology to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any modifications made according to the spirit of the main technical solution of the utility model should be included in the protection scope of the utility model.

Claims

1. A hot pressing tool for manufacturing a lithium-ion battery with a wound cell, characterized in that: It comprises a hot pressing inner cavity and an external protective cover (10); the upper part and the bottom part of the hot pressing inner cavity are respectively installed with a hot pressing positioning top plate (5) and a hot pressing positioning bottom plate (9); a booster cylinder (1) is installed on the protective cover (10); a driving shaft of the booster cylinder (1) passes through the protective cover (10) and the hot pressing inner cavity and is connected to the hot pressing positioning top plate (5), so as to control and drive the hot pressing positioning top plate (5) to move up and down.

2. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 1, characterized in that: A heating resistance wire (3) is provided between the upper part of the hot pressing inner cavity and the protective cover (10), and a plurality of inlet / exhaust holes (8) are provided on the left and right side walls of the hot pressing inner cavity.

3. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 2, characterized in that: The left and right side walls of the protective cover (10) are respectively provided with a main air hole (6), and a blower motor (4) is installed on the left side of the protective cover (10).

4. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 3, characterized in that: A guide rod (12) is fixed to the front side of the hot pressing positioning base plate (9), two slide rails (11) are provided on the guide rod, and a battery cell short circuit test pin (13) is provided at the upper end of the slide rail (11).

5. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 1, characterized in that: The hot pressing positioning top plate (5) and the hot pressing positioning bottom plate (9) are both provided with heating pipes inside.

6. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 1, characterized in that: A guide column (2) is installed on the top of the protective cover (10), and the guide column (2) passes through the protective cover (10) and the hot pressing inner cavity to connect to the hot pressing positioning top plate (5).

7. The hot pressing manufacturing tool for a lithium-ion battery with a wound cell according to claim 4, characterized in that: A control display panel (7) is installed on the left side of the protective cover (10).

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