Stacked Battery Cell Protective Layers Against Internal Short Circuits
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Solution Overview
Problem
Lithium-ion batteries face a high probability of internal short circuits during mechanical abuse, leading to thermal runaway due to contact between current collectors and active layers, necessitating improved safety performance.
Innovation Solution
A laminated battery cell design featuring first and second protective layers composed of conductive particles and binders, providing physical isolation and conductivity to prevent internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery cells are connected in parallel to increase capacity, then the battery capacity increases, but the battery pack width increases requiring larger packaging space
Solution Approach 1:
The patent transitions from horizontal parallel connection (increasing width) to vertical stacking (increasing height), thereby solving the spatial conflict by utilizing the height dimension instead of the width dimension to accommodate increased battery capacity
2Quantity of substance
If battery cells are connected in parallel, then battery capacity increases, but the number of connection terminals increases leading to complex interconnection
Solution Approach 1:
The patent merges multiple battery cell terminals vertically into a single terminal column, combining what would traditionally require multiple separate connection points into one integrated structure, thereby reducing interconnection complexity while maintaining increased capacity through parallel connection
Solution Approach 2:
The patent moves the connection terminal arrangement from a horizontal distribution (requiring multiple terminals across the width) to a vertical arrangement (consolidating terminals along the height), thereby reducing the number of connection points required while achieving the same capacity increase
3Quantity of substance
If conventional battery packs are designed with parallel connections, then capacity can be increased, but the height of the battery pack remains limited
Solution Approach 1:
The patent reorients the battery cell arrangement from horizontal parallel connection (constraining height) to vertical stacking (utilizing height), thereby enabling increased battery capacity while simultaneously increasing the usable height of the battery pack
Data Source
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AI summary
The present application provides a laminated battery cell and a lithium-ion battery, where the laminated battery cell includes an electrode sheet assembly and a protection assembly, where the protection assembly is located on the surface of the outer electrode sheet of the electrode sheet assembly; the electrode sheet assembly includes at least one functional electrode sheet, which includes a first current collector, a first protective layer and an active layer, the first protective layer being located between the first current collector and the active layer; the protection assembly includes a second current collector and a second protective layer that is away from the electrode sheet assembly; the first protective layer and the second protective layer each independently include a conductive particle and a binder, preventing the lithium-ion battery from internal short circuit during mechanical abuse, and making the lithium-ion battery has excellent safety performance.