一种可使锂电池稳定保持弧形结构的热压模具及软包锂电池
By designing the arc-shaped punch and die of the hot pressing mold and using the heating forming technology, the deformation problem caused by stress release during the installation of soft-pack lithium batteries on curved surfaces was solved, achieving a stable arc-shaped structure and improved safety performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGSHAN SHIBAO NEW ENERGY
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-17
AI Technical Summary
Traditional pouch lithium batteries exhibit poor stability and safety hazards due to stress release and rebound deformation when installed on curved surfaces.
Design a hot pressing mold that includes upper and lower modules. The mold has an arc-shaped punch and a die, and is equipped with a pressure sensor and a heating tube. By heating and molding, the internal stress is released, ensuring that the lithium battery maintains its arc-shaped structure.
This invention achieves a long-term stable arc structure for lithium batteries in curved surface installation, improving safety performance and molding stability, and preventing cracking caused by excessively small curvature radius.
Smart Images
Figure CN224510531U_ABST
Abstract
Claims
1. A hot-pressing mold that can stably maintain the arc-shaped structure of a lithium battery, characterized in that, include: The upper and lower mold groups are arranged vertically. The upper mold group has an arc-shaped punch at the bottom of the upper mold core and a concave die that mates with the punch at the top of the lower mold core. A pressure sensor for monitoring the mold closing pressure is located below the lower mold core. Heating tubes are installed in both the upper and lower mold groups. The pressure sensor and the heating tubes are electrically connected to a control device.
2. The hot press mold for stably maintaining the arc shape structure of the lithium battery according to claim 1, wherein, The radius of curvature R of the arc-shaped surface at the bottom of the punch and the arc-shaped surface inside the die is greater than or equal to T / 0.012 (mm), where T is the cell thickness.
3. The hot press mold for stably maintaining the arc shape structure of the lithium battery according to claim 1 or 2, characterized in that, The upper module is equipped with a first temperature sensor for monitoring the temperature of the upper mold core, and the lower module is equipped with a second temperature sensor for monitoring the temperature of the lower mold core. The first and second temperature sensors are electrically connected to the control device, respectively.
4. The hot press mold for stably maintaining the arc shape structure of the lithium battery according to claim 1 or 2, characterized in that, The upper mold core has four punches spaced horizontally at its bottom, and the lower mold core has the same number of concave dies as the number of punches at its top, with each die corresponding to the previous one.
5. A soft package lithium battery based on hot-pressing processing of the hot-pressing mold according to any one of claims 1-4, characterized in that, It includes: an arc-shaped battery cell, a porous elastic buffer layer disposed on both sides of the battery cell, and an aluminum-plastic film layer disposed on the outside of the porous elastic buffer layer. The positive and negative tabs of the battery cell are disposed on the surface of the aluminum-plastic film layer, and the thickness of the porous elastic buffer layer is 0.1-0.3 mm.
6. The soft-pack lithium battery according to claim 5, characterized in that, The positive and negative tabs are led out from the convex side of the battery cell and covered with a flexible insulating adhesive layer at the bend.
7. The soft-pack lithium battery of claim 5, wherein, The curvature center angle of the battery cell is ≤120°.
8. The soft-pack lithium battery of claim 5, wherein, The porous elastic buffer layer has an opening rate of 40%-60% and a pore size of 0.5-1mm.