Segmented Battery Cell Layout Against Piercing Short Circuits
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Solution Overview
Problem
High-capacity batteries used in electronic devices face a higher risk of internal short-circuit and burning due to piercing by foreign objects, compromising safety.
Innovation Solution
The battery is divided into two independent bare cell portions, each with its own charge and discharge ports, and positioned to protect each other, using tab glue to insulate and isolate the tabs from conductive layers, reducing the likelihood of simultaneous piercing and short-circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If battery capacity is increased to meet electricity quantity requirements, then energy storage capability is improved, but safety performance deteriorates due to higher risk of internal short-circuit and burning
Solution Approach 1:
The battery is divided into two independent bare cell portions (first bare cell portion and second bare cell portion), each with its own tabs and charge/discharge ports. This segmentation isolates the battery into separate functional units that can operate independently, reducing the risk that a single piercing event will cause complete battery failure or thermal runaway.
2Quantity of substance
If battery capacity is increased, then energy storage capability is improved, but risk of piercing damage and short-circuit increases
Solution Approach 1:
The design preemptively addresses piercing damage by creating a configuration where the first and second bare cell portions are positioned such that they protect each other. If one portion is pierced, the other remains intact and can still function, preventing the harmful effect of complete battery failure before it can occur.
Solution Approach 2:
Tab glue is used as an intermediary material to insulate and isolate the tabs from conductive layers. This intermediary layer prevents direct electrical contact between conductive elements, reducing the risk of short-circuiting even when piercing occurs, thereby mitigating the harmful effects of foreign object intrusion.
3Ease of manufacture
If battery structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but safety protection capability deteriorates
Solution Approach 1:
The second bare cell portion serves multiple functions: it acts as a functional battery component for energy storage and simultaneously serves as a protective element for the first bare cell portion. This multi-functionality allows the structure to maintain safety protection capabilities without adding separate dedicated protection components, thereby balancing ease of manufacture with safety requirements.
Data Source
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AI summary
A battery and an electronic device are disclosed. The battery includes: a first bare cell portion and a second bare cell portion. The first bare cell portion has a first surface and a side surface connected to the first surface, the first surface is configured to face towards a same direction as that of an opening of a battery compartment of an electronic device when the battery is installed in the battery compartment, and the side face is configured to face towards an inner side surface of the battery compartment of the electronic device when the battery is installed in the battery compartment. The second bare cell portion is located on a side that the first surface faces, and an orthographic projection of the second bare cell portion on the first surface overlaps the first surface, and/or the second bare cell portion is located on a side that the side surface faces, and an orthographic projection of the second bare cell portion on the side surface overlaps the side surface. In the battery provided in the embodiments of the present application, the risk of an internal short circuit and burning of the battery caused by high capacities of the first bare cell portion and the second bare cell portion can be reduced at least to some extent, and the safety of the battery can be improved.