CN-224232681-U - Winding machine

Abstract

The application discloses a winding machine which comprises an unwinding assembly and a winding needle, wherein the unwinding assembly comprises an unwinding mechanism, an unwinding correcting mechanism and a thickness compensating assembly, the unwinding mechanism is used for unwinding a pole piece, the unwinding correcting mechanism is arranged between the unwinding mechanism and the winding needle and is used for correcting the pole piece passing through the unwinding mechanism, the thickness compensating assembly comprises a thickness detecting mechanism and a thickness compensating mechanism which are adjacently arranged, the thickness detecting mechanism is arranged between the unwinding correcting mechanism and the winding needle and is used for detecting the thickness of the pole piece passing through the unwinding correcting mechanism, and the thickness compensating mechanism is arranged between the thickness detecting mechanism and the winding needle and is used for compensating the thickness of a pole piece area with abnormal thickness passing through the thickness detecting mechanism. Through the mode, the thickness homogenization control of the pole piece before winding can be realized.

Inventors

• SUN GANG
• LI JIAYUE
• QIU XIN

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260512

Application Date

20260224

Claims (10)

1. 1. A winding machine comprising an unwind assembly and a winding needle, wherein the unwind assembly comprises: The unreeling mechanism is used for unreeling the pole piece; The unreeling deviation correcting mechanism is arranged between the unreeling mechanism and the reeling needle and is used for correcting the deviation of the pole piece passing through the unreeling mechanism; The thickness compensation assembly comprises a thickness detection mechanism and a thickness compensation mechanism which are adjacently arranged, wherein the thickness detection mechanism is arranged between the unreeling deviation correcting mechanism and the reeling needle and used for detecting the thickness of the pole piece passing through the unreeling deviation correcting mechanism, and the thickness compensation mechanism is arranged between the thickness detection mechanism and the reeling needle and used for compensating the thickness of the pole piece region with abnormal thickness passing through the thickness detection mechanism.
2. 2. A winder as claimed in claim 1, characterised in that, The unreeling assembly also comprises a roller passing assembly which is arranged between the unreeling deviation correcting mechanism and the reeling needle, wherein, The thickness detection mechanism and the thickness compensation mechanism are arranged between the unreeling deviation correcting mechanism and the roller passing assembly.
3. 3. A winding machine according to claim 1 or 2, characterized in that, The thickness detection mechanism is arranged adjacent to the unreeling deviation correcting mechanism.
4. 4. A winder as claimed in claim 1, characterised in that, The thickness compensation mechanism comprises heating equipment and an adjustable guide roller set; and/or, the thickness detection mechanism comprises a laser thickness gauge.
5. 5. The winder as claimed in claim 4, wherein, The heating device comprises an infrared heating device.
6. 6. A winder as claimed in claim 1, characterised in that, The thickness compensation components are at least two groups, and each group of thickness compensation components are sequentially arranged along the unreeling direction.
7. 7. The winder as claimed in claim 6, wherein, At least two groups of thickness compensation components are adjacently arranged; And/or at least two groups of thickness compensation mechanisms of the thickness compensation assemblies are different in type.
8. 8. A winder as claimed in claim 1, characterised in that, The thickness detection mechanism comprises a plurality of detection heads, and the detection heads are used for detecting different areas of the pole piece; and/or the detection head of the thickness detection mechanism can rotate, and the detection head rotates to detect different areas of the pole piece.
9. 9. The winding machine of claim 1, wherein the unwind assembly further comprises at least one of: The pole piece compressing and conveying assembly is arranged adjacent to the winding needle and comprises a pole piece compressing and conveying piece and a pressure sensor, wherein the pole piece compressing and conveying piece is used for compressing the pole piece to feed the winding needle, and the pressure sensor is used for detecting the compressing force of the pole piece compressing and conveying piece; The magnetic rod is arranged between the unreeling mechanism and the reeling needle and is used for preprocessing the pole piece; The elastic locating pin is arranged at the inlet of the winding needle.
10. 10. A winder as claimed in claim 1, characterised in that, The winding machine further comprises a controller which is in communication connection with the thickness detection mechanism, and the controller is used for adjusting the unreeling parameter according to the thickness detection result of the thickness detection mechanism, wherein the unreeling parameter comprises at least one of winding tension and unreeling speed.

Description

Winding machine Technical Field The application relates to the technical field of winding machines, in particular to a winding machine. Background In the winding process of a battery (such as a lithium ion battery), the rebound rate of the pole piece at different positions can reach more than 25% due to the obvious elastic rebound difference in the winding process of the pole piece, so that the thickness of the pole piece is unevenly distributed in the winding direction, and the thickness difference can directly cause the position deviation of the pole lug after winding to form the dislocation phenomenon of the pole lug. Disclosure of utility model The application provides at least one winding machine. The application provides a winding machine which comprises an unwinding assembly and a winding needle, wherein the unwinding assembly comprises an unwinding mechanism, an unwinding correcting mechanism and a thickness compensating assembly, the unwinding mechanism is used for unwinding a pole piece, the unwinding correcting mechanism is arranged between the unwinding mechanism and the winding needle and is used for correcting the pole piece passing through the unwinding mechanism, the thickness compensating assembly comprises a thickness detecting mechanism and a thickness compensating mechanism which are adjacently arranged, the thickness detecting mechanism is arranged between the unwinding correcting mechanism and the winding needle and is used for detecting the thickness of the pole piece passing through the unwinding correcting mechanism, and the thickness compensating mechanism is arranged between the thickness detecting mechanism and the winding needle and is used for compensating the thickness of a pole piece area with abnormal thickness passing through the thickness detecting mechanism. Therefore, by arranging the thickness detection mechanism between the unreeling deviation correcting mechanism and the reeling needle, that is, by arranging the thickness detection mechanism after the unreeling deviation correcting mechanism, the thickness of the pole piece passing through the unreeling deviation correcting mechanism can be detected in real time, and the pole piece region with abnormal thickness can be determined. Through set up thickness compensation mechanism between thickness detection mechanism and book needle, namely, through set up thickness compensation mechanism behind thickness detection mechanism to can carry out thickness compensation to the unusual pole piece region of thickness, strengthen the homogeneity of pole piece thickness, realize the thickness homogenization control before the pole piece is convoluteed, solve the uneven problem of pole piece thickness that the difference of elasticity resilience that exists in unreeling in-process in different regions of pole piece leads to, thereby avoid appearing the utmost point ear dislocation phenomenon, and then avoid constituting systematic threat to the comprehensive properties and service life of battery because of utmost point ear dislocation problem. In addition, the thickness compensation mechanism is arranged adjacent to the thickness detection mechanism, after the thickness detection mechanism detects the thickness of the pole piece, the thickness compensation mechanism can accurately compensate the thickness of the pole piece area with abnormal thickness in real time, the uniformity of the thickness of the pole piece is enhanced, and the thickness homogenization control before the pole piece is wound is realized. The unreeling assembly further comprises a roller passing assembly, the roller passing assembly is arranged between the unreeling deviation correcting mechanism and the reeling needle, and the thickness detecting mechanism and the thickness compensating mechanism are arranged between the unreeling deviation correcting mechanism and the roller passing assembly front and back. Therefore, the thickness compensation mechanism is arranged between the unreeling deviation correcting mechanism and the roller passing assembly. The pole piece just completes correction, the pole piece does not have to go through a complex roller passing path, the state (such as rebound) of the pole piece is closer to the original real condition, and the thickness detection data can reflect the fundamental problem most. And the thickness compensation is carried out on the identified pole piece region with abnormal thickness before passing through the roller, so that the detection and compensation precision and stability are ensured. Wherein, thickness detection mechanism and unreels correction mechanism adjacent setting. Therefore, the thickness detection mechanism and the unreeling deviation correction mechanism are adjacently arranged, so that the thickness detection is performed at the elastic rebound stage of the pole piece through the thickness detection mechanism, the thickness detection can be accurately performed on the pole piece, and the thic