Winding Pin Positioning Member for Stable Electrode Assembly Clamping
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Solution Overview
Problem
Existing battery manufacturing processes face challenges in maintaining the positional stability of clamping pins during the winding and clamping of electrode assemblies, leading to issues such as wrinkling and deformation, which reduce the yield and quality of the batteries.
Innovation Solution
A positioning member with a second groove is inserted into the first groove of a winding pin to limit the movement of clamping pins, ensuring their fixed position and balanced force distribution, using centering measuring tools to facilitate symmetrical clamping and reduce positional shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of tabs are disposed in the electrode assembly, then the battery capacity increases, but the tabs occupy more space and reduce the battery pack volume
Solution Approach 1:
The positioning member is disposed inside the tab, with the tab inner wall forming a cavity that receives the positioning member. This nesting arrangement allows the positioning member to occupy space within the tab structure without increasing the overall battery pack volume, while still providing the necessary positioning function for multiple tabs
Solution Approach 2:
The positioning member extends in the thickness direction of the battery pack, utilizing the Z-axis dimension rather than occupying additional planar space. This dimensional approach allows multiple tabs to be positioned along the thickness direction, increasing battery capacity without expanding the battery pack footprint
2Ease of manufacture
If tabs are positioned at regular intervals, then the manufacturing process is simple, but the positioning precision is insufficient for precise battery module assembly
Solution Approach 1:
The positioning member acts as an intermediary component between the tab and the battery module. It provides precise positioning features (protrusions fitting into recesses) that enable accurate alignment during assembly, while the tab itself maintains its simple regular interval arrangement for easy manufacturing
Solution Approach 2:
The positioning member is pre-installed on the tab before the tab is inserted into the battery module. This preliminary positioning action ensures that when the tab is inserted, the aluminum foil is already accurately positioned, eliminating the need for complex positioning mechanisms during the main assembly process
3Ease of manufacture
If the tab structure is simplified, then the manufacturing cost decreases, but the positioning stability of the aluminum foil deteriorates
Solution Approach 1:
The positioning member is nested within the tab structure, utilizing the tab's own geometry (tab inner wall forming a cavity) to provide positioning functionality. This avoids the need for additional external positioning components, keeping the overall structure simple while maintaining aluminum foil positioning stability through the interference fit between the positioning member and tab cavity
Data Source
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AI summary
A positioning member, a winding device for an electrode assembly, and a battery manufacturing device are disclosed in the present application. The positioning member is used for being inserted into a first groove on an outer peripheral surface of the winding pin, which is used for winding an electrode sheet and a separator. The positioning member is provided with a second groove, which is configured for a clamping pin to insert so as to position relative positions of the first groove and the clamping pin. In the technical solution of the embodiment of the present application, the positioning member is arranged in the first groove, and a part of a space in the first groove is filled to limit movement of the clamping pin with respect to the winding pin in an axial direction of the winding pin, thereby preventing a position of the clamping pin with respect to the winding pin from being shifted in a moving process, so as to ensure that the position of the clamping pin with respect to the winding pin is fixed, which is convenient for the clamping pin to pick up an electrode assembly after winding, and reduces a probability of wrinkling and deformation of the electrode assembly in a clamping process, so as to ensure the quality of the electrode assembly, and improve the yield and the production efficiency of products.