CN-122025729-A - Winding device, winding apparatus, and method for producing electrode assembly

CN122025729ACN 122025729 ACN122025729 ACN 122025729ACN-122025729-A

Abstract

The application provides a winding device, a winding apparatus and a method for producing an electrode assembly. The winding device comprises a winding needle, a heating assembly, a temperature acquisition assembly and a control unit, wherein the winding needle is used for winding the pole piece and the separator of the electrode assembly, and the heating assembly is used for heating the pole piece and the separator so as to soften the pole piece and the separator. The heating assembly comprises a heat exchange pipeline, a temperature acquisition assembly and a control unit, wherein the heat exchange pipeline penetrates through the winding needle along the axial direction of the winding needle and can flow through fluid to exchange heat with the winding needle, the temperature acquisition assembly is arranged on the winding needle to acquire the current temperatures of the pole piece and the separator, and the control unit is respectively and electrically connected with the temperature acquisition assembly and the heating assembly to control the temperatures of the pole piece and the separator. The application is beneficial to improving the reliability of the battery.

Inventors

LUO WEIJIE
YE JIE
WU YONGJIANG
LIN WENFA

Assignees

宁德时代新能源科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20230403

Claims (14)

1. A winding device, characterized by comprising: a winding needle for winding the electrode sheet and the separator of the electrode assembly; The heating assembly is used for heating the pole piece and the separator to soften the pole piece and the separator and comprises a heat exchange pipeline, wherein the heat exchange pipeline penetrates through the winding needle along the axial direction of the winding needle and is configured to flow through fluid so as to exchange heat with the winding needle; the temperature acquisition assembly is arranged on the winding needle to acquire the current temperatures of the pole piece and the isolating piece; The control unit is respectively and electrically connected with the temperature acquisition assembly and the heating assembly so as to control the temperatures of the pole piece and the separator; Wherein the control unit is configured to: The control unit controlling the temperature rise of the fluid flowing through the heat exchange line in case the current temperature is less than a minimum temperature threshold at which the pole piece and the separator soften; the control unit controls the temperature of the fluid flowing through the heat exchange line to decrease in the case where the current temperature is greater than a maximum temperature threshold at which the pole piece and the separator soften.
2. The winding device according to claim 1, wherein the number of the heat exchanging lines is plural, and at least a part of the heat exchanging lines are arranged at intervals around the center line of the winding needle.
3. The winding device of claim 1, wherein the temperature acquisition assembly comprises a contact temperature sensor for directly acquiring the temperature of the pole piece and the separator.
4. The winding device according to claim 1, wherein the temperature acquisition assembly is disposed proximate to the heat exchange line.
5. The winding device according to any one of claims 1 to 4, wherein the winding needle includes an inner winding needle and an outer winding needle detachably connected to the inner winding needle and provided on an outer peripheral side of the inner winding needle, the inner winding needle being for sandwiching the pole piece and the separator starting section, and the outer winding needle being for winding the pole piece and the separator.
6. The winding device of claim 5, wherein the heat exchange line is disposed between the inner winding needle and the outer winding needle.
7. The winding device according to claim 5, wherein the number of the heat exchanging lines is plural, and the plural heat exchanging lines are arranged at intervals along the circumferential side of the inner winding needle.
8. The winding device of claim 1, wherein the heating assembly further comprises a plurality of heating elements, the plurality of heating elements being spaced around a centerline of the winding needle.
9. The winding device of claim 1, wherein the heating assembly further comprises a resistive element disposed at least in part along an axial direction of the winding needle.
10. The winding device of claim 1, wherein the heating assembly further comprises an infrared heating element disposed on a peripheral side of the winding needle and spaced apart from the winding needle.
11. A winding device, characterized by comprising a winding apparatus according to any one of claims 1 to 9.
12. A method of producing an electrode assembly, comprising: Winding the pole piece and the separator by adopting a winding pair; heating the pole piece and the separator by adopting a heating assembly so as to soften the pole piece and the separator; the temperature acquisition assembly is used for acquiring the current temperatures of the isolating piece and the pole piece and transmitting the current temperatures to the control unit; the control unit controlling the rise in temperature of the fluid flowing through the heat exchange line of the heating assembly in the event that the current temperature is less than a minimum temperature threshold at which the pole piece and the separator soften; The control unit controls the temperature of the fluid flowing through the heat exchange line of the heating assembly to decrease in the event that the current temperature is greater than a maximum temperature threshold at which the pole piece and the separator soften.
13. The method of producing an electrode assembly according to claim 12, wherein the minimum temperature threshold T1 satisfies 30 ℃ T1 60 ℃.
14. The method for producing an electrode assembly according to claim 12 or 13, wherein the maximum temperature threshold T2 satisfies 80 ℃ T2 120 ℃.

Description

Winding device, winding apparatus, and method for producing electrode assembly The application is based on the application number 202310340665.6, the application date 2023, 4 months and 3 days, and the application is a divisional application of the application of Ningde New energy science and technology Co., ltd, and the application name is winding device, winding equipment and production method of electrode assemblies. Technical Field The present application relates to the field of battery production technology, and more particularly, to a winding device, a winding apparatus, and a method of producing an electrode assembly. Background Batteries are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. The battery cells may include cadmium-nickel battery cells, hydrogen-nickel battery cells, lithium ion battery cells, secondary alkaline zinc-manganese battery cells, and the like. In addition to improving the service performance of a battery, how to improve the reliability of a battery is a non-negligible problem in the development of battery technology. Therefore, how to improve the reliability of the battery is a technical problem of continuous improvement in battery technology. Disclosure of Invention The embodiment of the application provides a winding device, winding equipment and a production method of an electrode assembly, which can improve the reliability of a battery. In a first aspect, the winding device provided by the embodiment of the application comprises a winding needle, a heating assembly, a temperature acquisition assembly and a control unit, wherein the winding needle is used for winding a pole piece and a separator of an electrode assembly, the heating assembly is used for heating the pole piece and the separator to soften the pole piece and the separator, the heating assembly comprises a heat exchange pipeline which is arranged on the winding needle in a penetrating way along the axial direction of the winding needle and is configured to flow through fluid so as to exchange heat with the winding needle, the temperature acquisition assembly is arranged on the winding needle so as to acquire the current temperature of the pole piece and the separator, the control unit is respectively electrically connected with the temperature acquisition assembly and the heating assembly so as to control the temperature of the pole piece and the separator, and the control unit is configured to control the temperature of the fluid flowing through the heat exchange pipeline to rise when the current temperature is smaller than the minimum temperature threshold for softening the pole piece and the separator, and control the control unit controls the temperature of the fluid flowing through the heat exchange pipeline to fall when the current temperature is larger than the maximum temperature threshold for softening the pole piece and the separator. According to the winding device provided by the embodiment of the application, the heating component is arranged to heat the pole piece and the separator, so that the pole piece and the separator of the electrode component are softened, the viscosity of the pole piece and the separator is favorably improved, the adhesion of the pole piece and the separator is favorably improved in the subsequent hot-pressing or cold-pressing process of the electrode component formed by winding, the risk of gaps in the electrode component is reduced, and the reliability of the battery is favorably improved under the condition that the electrode component is applied to the battery. The heat exchange assembly is convenient to control the heating temperature of the pole piece and the separator by controlling the temperature of fluid flowing through the heat exchange pipeline on the premise that the heat exchange pipeline is used for heating the pole piece and the separator, and the heating temperature of the pole piece and the separator by the heat exchange assembly is controlled accurately. The real-time temperature information of the pole piece and the separator is timely acquired through the temperature acquisition assembly, the heating temperature of the pole piece and the separator by the heating assembly is timely controlled, and the risk that the heating temperature of the pole piece and the separator by the heating assembly is too high or too low is reduced. The temperature information of the pole piece and the separator detected by the temperature acquisition component can be obtained through the control unit, and the heating temperature of the heating component can be timely adjusted, so that the pole piece and the separator have proper temperatures, and closed-loop control of the temperatures of the pole piece and the separator is formed. In some embodiments, the number of the heat excha