Winding device

Abstract

The utility model relates to the technical field of lithium battery winding, in particular to a winding device. Comprising a mounting base, a winding needle, an air source and a first air blowing assembly, the winding needle is arranged on the mounting base, the winding needle is used for fixing one end of a diaphragm assembly, the winding needle can rotate, and the diaphragm assembly is wound on the periphery of the winding needle; the first air blowing assembly is arranged on one side of the mounting base, the first air blowing assembly is connected with an air source, and when the winding needle is located at the vertical position, the first air blowing assembly is used for blowing air to the tail end of the diaphragm assembly so that the tail end of the diaphragm assembly can be straightened. According to the embodiment, the tail end of the diaphragm assembly can be prevented from being folded to form a Z-shaped crease, and the thickness of the tail end of the diaphragm assembly is prevented from being increased, so that the energy density of the lithium ion battery is improved.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery winding technology, and in particular to a winding device. Background Technology

[0002] Lithium-ion batteries are widely used in various consumer products, and the technology of lithium-ion batteries is also rapidly improving to meet people's needs.

[0003] In the lithium-ion battery winding process, a positive electrode sheet, a first separator, a negative electrode sheet, and a second separator are sequentially stacked to form a separator assembly. The separator assembly is then wound together using a winding machine's needle to form a cylindrical or prismatic cell. Before winding, one end of the separator assembly needs to be clamped onto the needle. After clamping, the end of the separator assembly hangs freely to one side of the needle. During the winding process, the end of the separator assembly is prone to folding, forming a Z-shaped crease, which increases the thickness of the end of the separator assembly and is detrimental to the high energy density of the lithium-ion battery. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a winding device to solve the problem that in the prior art, the four-layer separator assembly of the winding head is easily folded to form Z-shaped creases, which increases the thickness of the four-layer separator assembly and is not conducive to the high energy density of lithium-ion batteries.

[0005] This utility model discloses a winding device, including: a mounting base, a winding needle, an air source, and a first blowing assembly; the winding needle is disposed on the mounting base and is used to fix one end of the diaphragm assembly. The winding needle is rotatable and winds the diaphragm assembly around the outer periphery of the winding needle; the air source; the first blowing assembly is disposed on one side of the mounting base and connected to the air source. When the winding needle is in the initial position, the first blowing assembly is used to blow air onto the end of the diaphragm assembly to straighten the end of the diaphragm assembly.

[0006] Optionally, the winding device further includes a second blowing assembly disposed on one side of the mounting base and connected to the air source. When the winding needle is in a horizontal position, the second blowing assembly is used to blow air onto the end of the diaphragm assembly to straighten the end of the diaphragm assembly.

[0007] Optionally, the winding needle includes a first clamping arm and a second clamping arm disposed opposite to each other. Both the first clamping arm and the second clamping arm are disposed on the mounting base. The first clamping arm is movably disposed on one side of the second clamping arm so that the first clamping arm abuts against the second clamping arm, or is disposed at a preset distance from the second clamping arm. A groove is formed on the side of the first clamping arm near the second clamping arm, and a protrusion is formed on the side of the second clamping arm near the first clamping arm. When the first clamping arm abuts against the second clamping arm, the protrusion matches the groove and abuts against the groove.

[0008] Optionally, the first blowing assembly includes a first connecting air pipe, a first throttle valve, and a first blowing pipe. The first throttle valve is located at the inlet end of the first connecting air pipe and connected to the air source to control the air flow rate in the first connecting air pipe. The first blowing pipe is located at the outlet end of the first connecting air pipe.

[0009] Optionally, the second blowing assembly includes a second connecting air pipe, a second throttle valve, and a second blowing pipe. The second throttle valve is located at the inlet end of the second connecting air pipe and is connected to the air source to control the air flow rate in the second connecting air pipe. The second blowing pipe is located at the outlet end of the second connecting air pipe.

[0010] Optionally, when the winding needle is in the initial position, the angle between the first air blowing tube and the end of the diaphragm assembly is θ, and the value of θ ranges from 0° to 90°; when the winding needle is in the horizontal position, the second air blowing tube is parallel to the end of the diaphragm assembly.

[0011] Optionally, the output air pressure of the first air blowing pipe and the second air blowing pipe is 0.3MPa to 0.6MPa, and the airflow velocity is 10m / s to 40m / s.

[0012] Optionally, the length of the first air blowing tube is 150mm to 170mm, and the length of the second air blowing tube is 40mm to 60mm.

[0013] Optionally, the winding device is provided with a driver, the driving end of the driver is connected to the mounting base, and the driver is used to drive the mounting base to rotate; the mounting base is provided with a linear module, the linear module is connected to the first clamping arm, and is used to drive the first clamping arm to perform linear reciprocating motion, so that the first clamping arm abuts against the second clamping arm, or maintains a preset distance from the second clamping arm.

[0014] Optionally, the winding device further includes a pressure roller assembly located on one side of the mounting base, comprising a first pressure roller and a second pressure roller disposed opposite to each other, and the diaphragm assembly being disposed on the winding needle after passing through the first pressure roller and the second pressure roller.

[0015] Compared with the prior art, the beneficial effects of the winding device provided in this embodiment are as follows: A mounting base is provided to offer an installation environment for the winding needle, which then fixes one end of the separator assembly; an air source and a first blowing assembly are provided. When the winding needle is in its initial position (vertical), the first blowing assembly is connected to the air source and blows air onto the end of the separator assembly. Under the action of the airflow, the end of the separator assembly straightens and is shaped. Rotating the winding needle winds the separator assembly around its outer circumference to obtain the battery cell. This embodiment can prevent the end of the separator assembly from forming a Z-shaped crease, avoiding an increase in the thickness of the end of the separator assembly, thereby improving the energy density of the lithium-ion battery. Attached Figure Description

[0016] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the winding device when the winding needle is in the initial position, as provided in this embodiment of the utility model.

[0018] Figure 2 This is a schematic diagram of the overall structure of the winding device when the winding needle is in a horizontal position, as provided in this embodiment of the utility model.

[0019] Figure 3 yes Figure 1 Enlarged view of part A in the middle;

[0020] Figure 4 yes Figure 2 Enlarged view of part A in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the coiling needle provided in this embodiment of the utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the first blower assembly provided in this embodiment of the utility model.

[0023] The labels for the attached figures are as follows:

[0024] 10. Mounting base; 20. Winding needle; 210. First clamping arm; 211. Groove; 220. Second clamping arm; 221. Protrusion; 30. First blowing assembly; 310. First connecting air pipe; 320. First throttle valve; 330. First blowing pipe; 40. Second blowing assembly; 410. Second connecting air pipe; 420. Second throttle valve; 430. Second blowing pipe; 50. Pressure roller assembly; 510. First pressure roller; 520. Second pressure roller; 60. Diaphragm assembly; 610. Positive electrode sheet; 620. Negative electrode sheet; 630. First separator membrane; 640. Second separator membrane. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] This utility model embodiment provides a winding device, such as... Figures 1 to 4 As shown, the assembly includes a mounting base 10, a winding needle 20, an air source, and a first blowing assembly 30. The winding needle 20 is mounted on the mounting base 10 and can fix one end of the diaphragm assembly 60. The winding needle 20 can rotate to wind the diaphragm assembly 60 around its outer periphery. The first blowing assembly 30 is located on one side of the mounting base 10 and is connected to the air source. When the winding needle 20 is in its initial position, the first blowing assembly 30 is used to blow air onto the end of the diaphragm assembly 60 to straighten the end of the diaphragm assembly 60.

[0027] The mounting base 10 provides an installation environment for the winding needle 20. The winding needle 20 can fix one end of the separator assembly 60, and by rotating the winding needle 20, the separator assembly 60 can be wound around its outer periphery. An air source and a first blowing assembly 30 are provided. When the winding needle 20 is in its initial position (vertical), the first blowing assembly 30 is connected to the air source and blows air onto the end of the separator assembly 60. Under the action of the airflow, the end of the separator assembly 60 straightens and is shaped. Rotating the winding needle 20 winds the separator assembly 60 around its outer periphery to obtain the battery cell. This prevents the end of the separator assembly 60 from forming a Z-shaped crease, avoiding an increase in the thickness of the end of the separator assembly 60, thereby improving the energy density of the lithium-ion battery.

[0028] As a preferred embodiment, refer to Figure 2 and Figure 4 The winding device also includes a second blowing assembly 40, which is located on one side of the mounting base 10 and connected to an air source. When the winding needle 20 is in a horizontal position, the second blowing assembly is used to blow air onto the end of the diaphragm assembly 60 to straighten the end of the diaphragm assembly 60.

[0029] During the winding process of the separator assembly 60, the winding needle 20 rotates counterclockwise from the initial position (the winding needle 20 is in a vertical state). When the winding needle 20 is in a horizontal position (the winding needle 20 is in a horizontal state), the second blowing assembly 40 works. Under the action of airflow, the end of the separator assembly 60 is straightened and shaped again, further preventing the end of the separator assembly 60 from forming a Z-shaped crease, thereby avoiding the increase in the thickness of the end of the separator assembly 60 and further improving the high energy density of the lithium-ion battery.

[0030] As a preferred embodiment, refer to Figure 5 The coiling needle 20 includes a first clamping arm 210 and a second clamping arm 220. Both the first clamping arm 210 and the second clamping arm 220 are mounted on the mounting base 10. The first clamping arm 210 is movably mounted on one side of the second clamping arm 220 so that the first clamping arm 210 abuts against the second clamping arm 220 or is set at a preset distance from the second clamping arm. A groove 211 is formed on the side of the first clamping arm 210 near the second clamping arm 220, and a protrusion 221 is formed on the side of the second clamping arm 220 near the first clamping arm 210. When the first clamping arm 210 abuts against the second clamping arm 220, the protrusion 221 matches the groove 211 and abuts against the groove 211.

[0031] The first clamping arm 210 of the winding needle 20 is movably disposed on one side of the second clamping arm 220. When the diaphragm assembly 60 is clamped on the winding needle 20, the first clamping arm 210 is moved to maintain a preset distance between the first clamping arm 210 and the second clamping arm 220, so that one end of the diaphragm assembly 60 passes through the preset distance between the first clamping arm 210 and the second clamping arm. The first clamping arm 210 is moved closer to the second clamping arm 220 so that the first clamping arm 210 abuts against the second clamping arm 220. The diaphragm assembly 60 is fixed on the holding arm 220 between the first clamping arm 210 and the second clamping arm 220. Simultaneously, a groove 211 is formed on the side of the first clamping arm 210 near the second clamping arm 220, and a protrusion 221 is formed on the side of the second clamping arm 220 near the first clamping arm 210. The protrusion 221 abuts against the groove 211, and one end of the diaphragm assembly 60 is clamped between the protrusion 221 and the groove 211, ensuring the stable clamping of the diaphragm assembly 60 on the winding needle 20. This allows the diaphragm assembly 60 to wind around the outer periphery of the winding needle 20 during rotation, ensuring the smoothness and stability of the winding operation.

[0032] As a preferred embodiment, refer to Figure 1 and Figure 6 The first air blowing assembly 30 includes a first connecting air pipe 310, a first throttle valve 320 and a first air blowing pipe 330. The first throttle valve 320 is located at the inlet end of the first connecting air pipe 310 and is connected to an air source to control the air flow rate in the first connecting air pipe 310. The first air blowing pipe 330 is located at the outlet end of the first connecting air pipe 310.

[0033] In the structure of the first blowing assembly 30, the first throttle valve 320 is connected to the output pipe of the gas source to introduce gas. The gas enters the first connecting pipe 310 through the first throttle valve 320 along the inlet end of the first connecting pipe 310. At the same time, the first throttle valve 320 can also control the gas flow rate in the first connecting pipe 310, thereby adjusting the gas flow rate according to actual needs. The airflow passes through the first connecting pipe 310 and enters the first blowing pipe 330 along the outlet end of the first connecting pipe 310. Under the guidance of the first blowing pipe 330, it blows towards the end of the diaphragm assembly 60, thereby achieving the purpose of straightening the end of the diaphragm assembly 60.

[0034] As a preferred embodiment, refer to Figure 1 and Figure 2 The second blowing assembly includes a second connecting air pipe 410, a second throttle valve 420, and a second blowing air pipe 430. The second throttle valve 420 is located at the inlet end of the second connecting air pipe 410 and is connected to an air source to control the air flow rate in the second connecting air pipe 410. The second blowing air pipe 430 is located at the outlet end of the second connecting air pipe 410.

[0035] In the structure of the second blowing assembly, the second throttle valve 420 is connected to the output pipe of the gas source to introduce gas. The gas enters the second connecting pipe 410 through the inlet end of the second connecting pipe 410 via the second throttle valve 420. At the same time, the second throttle valve 420 can also control the gas flow rate in the second connecting pipe 410, thereby adjusting the gas flow rate according to actual needs. The airflow passes through the second connecting pipe 410 and enters the second blowing pipe 430 along the outlet end of the second connecting pipe 410. Under the guidance of the second blowing pipe 430, the airflow blows towards the end of the diaphragm assembly 60, thereby achieving the purpose of straightening the end of the diaphragm assembly 60.

[0036] In actual operation, a solenoid valve is used to control the air supply to the first air blowing assembly or the second air blowing assembly.

[0037] As a preferred embodiment, refer to Figure 1 and Figure 3 When the winding needle 20 is in the initial position, the angle between the first air blowing pipe 330 and the end of the diaphragm assembly 60 is θ, and the value of θ ranges from 0° to 90°; when the winding needle 20 is in the horizontal position, the second air blowing pipe 430 is parallel to the end of the diaphragm assembly 60.

[0038] In this configuration, with the hairpin 20 in its initial position (vertical), the angle between the first air-blowing pipe 330 and the end of the diaphragm assembly 60 is 0° to 90°. The end of the diaphragm assembly 60 is subjected to a downward vertical component of the airflow, thereby straightening and shaping the end of the diaphragm assembly 60. The angle between the first air-blowing pipe 330 and the end of the diaphragm assembly 60 can be 0°, 30°, 45°, 60°, or 90°. In this embodiment, for example... Figure 3 The angle between the first air blowing tube 330 and the end of the diaphragm assembly 60 is selected to be 45°. This ensures that the end of the diaphragm assembly 60 can be straightened and shaped, and at this angle, the setting position of the first air blowing assembly will not interfere with the operation of the winding needle 20.

[0039] When the winding needle 20 is in a horizontal position, the second air blowing tube 430 is parallel to the end of the diaphragm assembly 60, and the end of the diaphragm assembly 60 can be straightened and shaped by the horizontal airflow.

[0040] As a preferred embodiment, the output air pressure of the first air pipe 330 and the second air pipe 430 is 0.3MPa to 0.6MPa, and the airflow velocity is 10m / s to 40m / s.

[0041] The settings for the output air pressure and airflow velocity of the first air blowing pipe 330 and the second air blowing pipe 430, within the aforementioned limits, ensure that the gas blown out by the first air blowing pipe 330 and the second air blowing pipe 430 straightens the end of the diaphragm assembly 60 under the action of the airflow, without damaging the diaphragm assembly 60. The output air pressure of the first air blowing pipe 330 and the second air blowing pipe 430 can be 0.3MPa, 0.4MPa, 0.5MPa, and 0.6MPa; the airflow velocity can be 10m / s, 20m / s, 30m / s, and 40m / s.

[0042] As a preferred embodiment, the length of the first air blowing pipe 330 is 150mm to 170mm, and the length of the second air blowing pipe 430 is 40mm to 60mm.

[0043] The aforementioned length limitations on the first air-blowing pipe 330 and the second air-blowing pipe 430 are designed to guide the gas output from both pipes to the end of the diaphragm assembly 60, thereby achieving the function of blowing air onto the end of the diaphragm assembly 60. The length of the first air-blowing pipe 330 can be 150mm, 160mm, or 170mm, and the length of the second air-blowing pipe 430 can be 40mm, 50mm, or 60mm. In this embodiment, the length of the first air-blowing pipe 330 is 160mm, and the length of the second air-blowing pipe 430 is 50mm.

[0044] As a preferred embodiment, the winding device is provided with a driver (not shown in the figure), the driving end of the driver is connected to the mounting base 10, and the driver is used to drive the mounting base 10 to rotate; the mounting base 10 is provided with a linear module (not shown in the figure), the linear module is connected to the first clamping arm 210, and is used to drive the first clamping arm 210 to perform linear reciprocating motion, so that the first clamping arm 210 abuts against the second clamping arm 220, or maintains a preset distance from the second clamping arm.

[0045] The driver is configured to drive the mounting base 10 to rotate, thereby causing the winding needle 20 to rotate. In this embodiment, the driver can be a motor, which causes the winding needle 20 to rotate counterclockwise.

[0046] A linear module is provided on the mounting base 10. The linear module is used to control the first clamping arm 210 to perform linear reciprocating motion, so that the first clamping arm 210 abuts against the second clamping arm 220, or maintains a preset distance from the second clamping arm 220. The operator can control the linear module according to the workflow to achieve the clamping and winding of the diaphragm assembly 60 by the winding needle 20. In this embodiment, the linear module can be a ball screw linear module, and no specific limitation is made here.

[0047] As a preferred embodiment, refer to Figure 1 and Figure 2 The winding device also includes a pressure roller assembly 50, which is located on one side of the mounting base 10 and includes a first pressure roller 510 and a second pressure roller 520 arranged opposite to each other. The diaphragm assembly 60 is placed on the winding needle 20 after passing through the first pressure roller 510 and the second pressure roller 520.

[0048] In this process, by setting up a first pressure roller 510 and a second pressure roller 520 opposite to each other, the positive electrode 610, negative electrode 620, first separator 630, and second separator 640 of the diaphragm assembly 60 approach each other after passing through the first pressure roller 510 and the second pressure roller 520, and reach the winding needle 20 under the conveying of the pressure roller assembly 50, where they are fixed. The pressure roller assembly 50 serves to transport the diaphragm assembly 60 and improves the smoothness and stability of the winding of the winding device.

[0049] It should be understood that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the appended claims of this utility model.

Claims

1. A winding device, characterized in that, include: Mounting base; A winding needle is provided on the mounting base. The winding needle is used to fix one end of the diaphragm assembly. The winding needle can rotate to wind the diaphragm assembly around the outer periphery of the winding needle. Gas source; A first air blowing assembly is disposed on one side of the mounting base and connected to the air source. When the winding needle is in the initial position, the first air blowing assembly is used to blow air onto the end of the diaphragm assembly to straighten the end of the diaphragm assembly.

2. The winding device according to claim 1, characterized in that, The winding device further includes: The second air blowing assembly is located on one side of the mounting base and connected to the air source. When the winding needle is in a horizontal position, the second air blowing assembly is used to blow air onto the end of the diaphragm assembly to straighten the end of the diaphragm assembly.

3. The winding device according to claim 2, characterized in that, The coiling needle includes a first clamping arm and a second clamping arm disposed opposite to each other. Both the first clamping arm and the second clamping arm are disposed on the mounting base. The first clamping arm is movably disposed on one side of the second clamping arm so that the first clamping arm abuts against the second clamping arm, or maintains a preset distance from the second clamping arm. The first clamping arm has a groove on the side near the second clamping arm, and the second clamping arm has a protrusion on the side near the first clamping arm. When the first clamping arm and the second clamping arm abut against each other, the protrusion matches the groove and abuts against the groove.

4. The winding device according to claim 3, characterized in that, The first air blowing assembly includes a first connecting air pipe, a first throttle valve, and a first air blowing pipe. The first throttle valve is located at the inlet end of the first connecting air pipe and is connected to the air source to control the air flow rate in the first connecting air pipe. The first air blowing pipe is located at the outlet end of the first connecting air pipe.

5. The winding device according to claim 4, characterized in that, The second air blowing assembly includes a second connecting air pipe, a second throttle valve, and a second air blowing pipe. The second throttle valve is located at the inlet end of the second connecting air pipe and is connected to the air source to control the air flow rate in the second connecting air pipe. The second air blowing pipe is located at the outlet end of the second connecting air pipe.

6. The winding device according to claim 5, characterized in that, When the winding needle is in the initial position, the angle between the first air blowing tube and the end of the diaphragm assembly is θ, and the value of θ ranges from 0° to 90°; when the winding needle is in the horizontal position, the second air blowing tube is parallel to the end of the diaphragm assembly.

7. The winding apparatus according to claim 6, characterized in that, The output air pressure of the first air blowing pipe and the second air blowing pipe is 0.3MPa to 0.6MPa, and the airflow velocity is 10m / s to 40m / s.

8. The winding apparatus according to claim 7, characterized in that, The length of the first air blowing tube is 150mm to 170mm, and the length of the second air blowing tube is 40mm to 60mm.

9. The winding device according to claim 3, characterized in that, The winding device is equipped with a driver, the driving end of which is connected to the mounting base, and the driver is used to drive the mounting base to rotate. The mounting base is provided with a linear module, which is connected to the first clamping arm and is used to drive the first clamping arm to perform linear reciprocating motion so that the first clamping arm abuts against the second clamping arm or maintains a preset distance from the second clamping arm.

10. The winding apparatus according to claim 1, characterized in that, The winding device further includes a pressure roller assembly located on one side of the mounting base, comprising a first pressure roller and a second pressure roller arranged opposite to each other, and the diaphragm assembly being disposed on the winding needle after passing through the first pressure roller and the second pressure roller.

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