Battery Tab Parallel Loop Layout for Smaller Protection Boards
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Solution Overview
Problem
The capacity of existing lithium-ion batteries is limited due to the size of the protection board assembly, which is required to handle high currents, thereby reducing the available space for the battery cell and affecting battery life.
Innovation Solution
A battery design with a connecting member having two connecting tabs that form composite and parallel current loops with the protection board assembly, reducing the current magnitude in each loop and allowing for a smaller protection board assembly, thus increasing the battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a non-aqueous electrolyte battery is used, then energy density and portability are improved, but safety issues arise due to flammability of the electrolyte
Solution Approach 1:
A gel layer is introduced as an intermediary substance between the electrodes and electrolyte. This gel layer acts as a physical barrier that prevents direct contact between the flammable electrolyte and potential ignition sources, while still allowing ionic conduction. The gel layer mediates between the need for high energy density (using non-aqueous electrolyte) and safety concerns (flammability), enabling both requirements to be satisfied simultaneously.
2Quantity of substance
If battery capacity is increased to meet higher power consumption demands, then energy supply is improved, but heat generation increases causing safety and durability issues
Solution Approach 1:
A gel layer with flexible, porous structure is applied between the electrodes. This gel film provides thermal management by allowing heat to dissipate through its porous structure while maintaining electrical insulation. The flexible gel structure can accommodate thermal expansion and contraction, preventing heat buildup even when battery capacity is increased to meet higher power demands.
3Power
If lithium ion batteries are used instead of rechargeable lithium batteries, then output power is improved, but memory effect and overcharge damage occur
Solution Approach 1:
The gel layer incorporates a solid electrolyte interface (SEI) membrane that automatically forms protective barriers during charging cycles. This self-service mechanism prevents overcharge damage by blocking further ion transport when the battery reaches full charge, eliminating the need for external memory management systems. The gel layer's inherent properties provide automatic protection against memory effect while maintaining high output power capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The parallel current loops reduce the size of the protection board assembly, allowing for a larger battery capacity and improved battery life.
Implementation Method 1
a gel layer comprising a gel matrix and a non-aqueous electrolyte in the gel matrix
Implementation Method 2
a solid electrolyte interface membrane between the electrodes and the gel layer
Data Source
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AI summary
Provided are a battery and an electronic device. The battery includes a battery cell, a connecting member, and a protection board assembly. The battery cell includes a battery cell body and two tabs connected to the battery cell body. The connecting member includes two connecting tabs and a connecting portion connecting the two connecting tabs, where one of the connecting tabs is connected to and electrically conducted with one of the tabs, to form a composite tab; the composite tab and the other one of the tabs are both connected to the protection board assembly to form a first loop; and the other one of the connecting tabs and the other one of the tabs are both connected to the protection board assembly to form a second loop. By providing a connecting member having two connecting tabs, a first loop and a second loop which are connected in parallel can be formed, that is, a protection board assembly and a battery cell have two parallel loops formed, such that the magnitude of the current in a single loop of the protection board assembly can be reduced, the size of the protection board assembly can be decreased, and the accommodating size of the battery can be increased, thereby improving the capacity of the battery cell, and improving the capacity of the battery.